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This PDF file contains the front matter associated with SPIE Proceedings Volume 7972, including the Title Page, Copyright information, Table of Contents, Introduction (if any), and the Conference Committee listing.
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Although Extreme ultraviolet lithography (EUVL) is now well into the commercialization phase, critical challenges
remain in the development of EUV resist materials. The major issue for the 22-nm half-pitch node remains
simultaneously meeting resolution, line-edge roughness (LER), and sensitivity requirements. Although several materials
have met the resolution requirements, LER and sensitivity remain a challenge. As we move beyond the 22-nm node,
however, even resolution remains a significant challenge. Chemically amplified resists have yet to demonstrate the
required resolution at any speed or LER for 16-nm half pitch and below. Going to non-chemically amplified resists,
however, 16-nm resolution has been achieved with a LER of 2 nm but a sensitivity of only 70 mJ/cm2.
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This paper discusses the future of resist materials for sub-20nm
lithography. It is my contention that polymer-bound PAG based resists
will be used to 16nm node. There has been enough progress in
resolution and sensitivity to justify the use of these materials. PBP
resists have shown that the principal demerit of acid diffusion can be
overcome through attachment of the PAG anion to the lithographic
polymer. Since the introduction of this chemically amplified resist
approach, we have seen steady improvement in resolution, sensitivity,
and LWR. We have also seen improvement in OOB response, outgassing,
and pattern collapse. There is no doubt that continuous improvement
is still required for these resist systems. We believe that increasing the
overall resist quantum yield for acid generation substantially improves
the shot noise problem thereby leading to faster high resolution resist
materials. Using a 0.30NA EUV tool with dipole, we can achieve 22nm
hp resolution, with 12mJ dose, and 4.2nm LWR.
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Novel Processing Special Topic: Negative-Tone Development I
Solvent development of chemically amplified (CA), negative tone photoresists depends on several factors including
molecular weight of the photoresist, the strength of polymer-solvent interactions, and the strength of polymer-polymer
interactions in the undeveloped regions. Absent are the ionic interactions present in the aqueous base development of CA
resists that greatly aids dissolution and image contrast. In its place, strong hydrogen bonding of the exposed photoresist
leads to effective resistance to dissolution in non-polar developers. These effects are discussed in the context of Flory-
Huggins theory. As part of a study of low environmental impact developers several, non-polar solvents have been
investigated with negative tone, chemically amplified photoresists. These include supercritical CO2, hydrofluoroethers
and silicone fluids. Each of these solvents has low surface energy, unique dissolution characteristics and is capable of
developing sub-50 nm patterns. Performance aspects of these developers will be described.
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In this work, we investigate the Negative Tone Develop (NTD) process from a fundamental
materials/process interaction perspective. Several key differences exist between a negative tone develop
process and a traditional positive tone develop system. For example, the organic solvent dissolves the
unexposed material, while the deprotected resist remains intact. This causes key differences in key
patterning properties, such as pattern collapse, adhesion, remaining resist, and photoresist etch selectivity.
We have carried out fundamental studies to understand these new interactions between developer and
remaining resist with negative tone develop systems. We have characterized the dynamic dissolution
behavior of a model system with a quartz crystal microbalance with both positive and negative tone solvent
developers. We have also compared contrast curves, and a fundamental model of image collapse. In
addition, we present first results on Optical Proximity Correction (OPC) modeling results of current
Negative Tone Develop (NTD) resist/developer systems.
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The effect of solvent developers on the negative tone development process was studied in both dry and immersion 193
nm lithography. While acetate-based solvent developers yielded sharp thickness contrasts with a minimum resist
thickness loss, severe missing contact holes were observed under lower image-log slope conditions. In contrast, ketone-based
solvent developers yielded excellent contact hole performance under poor aerial image conditions without the
formation of missing contact holes. However, it was observed that ketone-based solvent developers can cause poor
thickness contrasts with more resist thickness loss. By using additives in the ketone-based developers, it was possible to
tailor various resist performance parameters such as photospeeds, critical dimension uniformity, resist thickness
retention, and dissolution rate contrasts. It was found that higher dissolution rate contrast can give better uniformity in
the critical dimension, better thickness retention and less missing contact holes.
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EUV lithography is expected to be the key lithography option for sub-22nm device manufacturing. In order to meet the
required imaging capability, resist performance improvements are being investigated by exploring both chemically
amplified resists (CAR) and non-CAR chemistries. Another critical item related to resist chemistry is the EUV
irradiation induced outgassing and its risk for optics contamination, especially towards high source power (pre-)
productions tools. In this area it is important to characterize for the different chemistries which resist components are
critical for EUV induced outgassing and - more important - which can result in non-cleanable mirror contamination.
In this paper, we will explore the outgassing and contamination behavior of CAR and non-CAR resist by using Residual
Gas Analysis (RGA) for identifying the resist outgassing characteristics, and by Witness Sample (WS) testing to evaluate
the tendency for contamination. For CAR resists, it has been found that the PAG cation is a key component contributing
to the contamination, but its impact can be changed by changing the resist formulation. In this investigation several
model resists have been evaluated in order to understand which chemical components have - or don't have - an impact
on the contamination. This has led to a proposal of a definition for a resist family. For non-CAR materials, the
investigation has focused to a number of example resists. Most results are related to poly(-olefin sulfones), which have
been proven to be good candidate materials for outgassing and contamination learning. The tests have confirmed that
aromatic groups present in resist outgassing are playing an important role. As an opposite example of non-CAR
material, the inorganic Inpria resist was tested, which revealed that its resist outgassing (water and oxygen) can remove
carbon contamination.
The combined work on CAR and non-CAR outgassing and contamination has learned significantly on the relationship
between resist chemistry, its outgassing and contamination, and provided understanding on how to design good
performing EUV resists with minimal risk for optics contamination in EUV device manufacturing.
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This paper summarizes the development of EUV molecular resists based on fullerene derivatives: the lithographic
evaluation results of EUV resists using a small-field exposure tool (SFET). Moreover this is the first report on the
application of fullerene-based molecular resists to half-pitch (hp) 3x-nm test device fabrication using a full-field
step-and-scan exposure tool (EUV1).
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Blurs, swelling properties and lithographic performance for polymer bound PAG and polymer PAG blended type resists
were studied. A Blur strongly depends on PAG size and the polymer bound PAG type resist reduces the Blur. The Blur
for the polymer bound PAG type resist is smaller than that for ZEP (non CAR). That indicates that polymer bound PAG
should reduce secondary electron diffusion. The polymer bound PAG type resist acquires very small Blur with higher
sensitivity and suppresses swelling very well, therefore polymer bound PAG is one of the promising technologies that
improve Resolution, LWR and sensitivity (RLS) property. RLS property on EUV exposure tool is significantly
improved by using the polymer bound PAG type resist. Resolution reaches 24nmhp and is limited by pattern collapse
and line breaking. Further lithographic experiments on EB exposure tool which has higher NILS than EUV exposure
tool were carried out in order to make clear relation between Blur and resolution. The resolution of the polymer bound
PAG type resist reaches 17.5nmhp with 35nm thickness and there is possibility that the resolution of an optimized
polymer bound PAG type resist reaches under 15nmhp. The resolution of the resist with lower capillary force (C.F.)
given and lower swelling and on higher NILS exposure tool strongly depends on the Blur.
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Historically, lithographic scaling has been driven by both improvements in wavelength and numerical aperture. In the
semiconductor industry, the transition to 1.35NA immersion lithography has recently been completed, and the focus is
now on double patterning techniques (DPT) as a means to circumvent the limitations of Rayleigh's definition. Actually,
self-aligned spacer double patterning (SADP) has already been employed in high volume manufacturing of NAND flash
memory devices. This paper introduces demonstration results focused on the extendibility of double patterning
techniques for various device layouts.
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The spacer patterning process is one of the strongest double patterning technology candidates for fabricating 2xnm node
semiconductor devices by ultra-low-k1 lithography. However, a severe problem exists with this process, it has an
excessive number of steps, including resist patterning, core film etching, spacer film deposition, spacer film etchback,
core film removal, and hard mask patterning steps. We devised a simpler process in which a resist pattern is directly used
as the core film pattern and the spacer film is a low-temperature-deposited oxide film that can be fabricated around the
resist pattern without damaging the resist material. Thus, this new process, which we call "resist-core" spacer patterning,
has significantly fewer patterning steps. When we used the new process to fabricate 2xnm node semiconductor devices
with an ArF immersion scanner, two key issues arose. The first issue regarding the controllability of the resist pattern
profile, which can directly affect the spacer film pattern profile, was addressed by applying various resist patterning
conditions such as resist materials, illumination conditions, and bottom anti-reflecting materials. The second issue,
regarding the resist slimming method was addressed by evaluating two alternative techniques, wet slimming and dry
slimming.
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Double Patterning Technology (DPT) was commonly accepted as the major workhorse beyond water immersion
lithography for sub-38nm half-pitch line patterning before the EUV production. For dense hole patterning, classical DPT
employs self-aligned spacer deposition and uses the intersection of horizontal and vertical lines to define the desired hole
patterns. However, the increase in manufacturing cost and process complexity is tremendous. Several innovative
approaches have been proposed and experimented to address the manufacturing and technical challenges.
A novel process of double patterned pillars combined image reverse will be proposed for the realization of low cost
dense holes in 30nm node DRAM. The nature of pillar formation lithography provides much better optical contrast
compared to the counterpart hole patterning with similar CD requirements. By the utilization of a reliable freezing
process, double patterned pillars can be readily implemented. A novel image reverse process at the last stage defines the
hole patterns with high fidelity.
In this paper, several freezing processes for the construction of the double patterned pillars were tested and compared,
and 30nm double patterning pillars were demonstrated successfully. A variety of different image reverse processes will
be investigated and discussed for their pros and cons. An economic approach with the optimized lithography
performance will be proposed for the application of 30nm DRAM node.
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Three resist freezing methods (fluoride plasma, chemical and thermal freezing) were studied for double patterning cross
pattern by printing the second layer directly on top of the first resist layer. Different methods show different challenges:
plasma freezing is very hard to remove footing on both layers; Chemical freezing first layer CD will grow after completion
of second pattern; thermal freezing will change line curvature when the CD is smaller than 50nm, if first layer is wave type
pattern.
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Pitch division lithography (PDL) with a photobase generator (PBG) allows printing of grating images with twice
the pitch of a mask. The proof-of-concept has been published in the previous paper and demonstrated by
others. Forty five nm half-pitch (HP) patterns were produced using a 90nm HP mask, but the image had line
edge roughness (LER) that does not meet requirements. Efforts have been made to understand and improve the
LER in this process. Challenges were summarized toward low LER and good performing pitch division.
Simulations and analysis showed the necessity for an optical image that is uniform in the z direction in order for
pitch division to be successful. Two-stage PBGs were designed for enhancement of resist chemical contrast. New
pitch division resists with polymer-bound PAGs and PBGs, and various PBGs were tested. This paper focuses on
analysis of the LER problems and efforts to improve patterning performance in pitch division lithography.
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Pitch-split resist materials have been developed for the fabrication of sub-74 nm pitch semiconductor devices. A
thermal cure method is used to enable patterning of a second layer of resist over the initially formed layer. Process
window, critical dimension uniformity, defectivity and integration with fabricator applications have been explored. A
tone inversion process has been developed to enable the application of pitch split to dark field applications in addition to
standard bright field applications.
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Resist dissolution plays an important role in the optimization of resist materials and processes for next-generation
lithographic technologies. In this paper, an in situ analysis of EUV resist dissolution is performed utilizing high-speed
atomic force microscopy (HS-AFM). Here, the physical changes in EUV resist films are observed in real-time before,
during and after the dissolution process. This concept of observing the actual pattern formation of resists during
dissolution brings about new ideas in the understanding of the mechanisms that govern the patterning process. Based
on this method, resist film swelling of an acryl-based polymer resist during dissolution was found to be controlled by
bounding the PAG-anion to the polymer structure. Moreover, a comparison of analysis results between the HS-AFM
and the quartz crystal microbalance is also discussed. A similar trend in the amount of resist swelling was obtained for
both methods. However, a large difference between these results was observed. Lastly, recent improvements in the
system have allowed the in situ characterization of rinse process after dissolution. Initial results have shown that
during the standard rinse process with de-ionized water, there is an occurrence of line size narrowing and afterwards,
swelling. These results show the potential of HS-AFM in analyzing not only the dissolution characteristics but also the
behavior of resists during the rinse process.
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Variations in critical dimension (CD) as a function of the proximity of an individual feature to other exposed areas are
continuing to be a problem in the lithography process. For example, the CD uniformity (CDU) may degrade significantly
depending on the proximity to densely or sparsely exposed areas. These pattern density effects will continue to get worse
and become more complex as feature sizes decrease.
Pattern density effects are believed to arise from several sources and may simultaneously contribute to a net observed
CD variation [1]. One such source, develop loading, results in local depletion of developer in highly exposed regions,
reducing the dissolution rate and thereby locally affecting CD. In this report we describe our results in visualizing
develop loading by using pH sensitive dyes. Two different types of dyes are explored: acid/base pH indicators and a
fluorescent dye bound to the resist polymer.
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In this study, we have analyzed new data sets of pattern collapse obtained from 300 mm wafers which were coated with
a process-of-record (POR) EUV resist and exposed by an EUV Alpha-Demo tool (ADT) and a Vistec VB300 e-beam
exposure tool. In order to minimize any processing effects on pattern collapse, the same POR EUV track process was
applied to both exposures. A key metric of our analysis is the critical aspect ratio of collapse (CARC)1. We found that
CARC of POR EUV resist decreases monotonically with spacing, in the range of ~1.8-2.2 at ~32-54 nm space (60-80
nm pitch) for EUV, and ~1.5-2.1 at ~16-50 nm space (~46-80 nm pitch) for e-beam. We also estimated an apparent
Young's modulus of POR EUV resist by fitting a collapse model2 to the CARC data. The resulting modulus ~0.30 GPa
was much smaller than the modulus of typical polymer glasses (~1.0-5.0 GPa). Our findings suggest that due to a
significant decrease of resist mechanical properties and a sharp increase in capillary force, it will be challenging to
maintain aspect ratios above 2.0 for sub-30 nm resist spacing (sub-60 nm pitches). For patterning at these dimensions,
alternate processes and materials will become increasingly necessary, e.g. surfactant-based rinse solutions3 and other
approaches.
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The concept of nonlinear acid diffusion coefficient would be emphasized to achieve better latent image
quality, resulting in better lithographic performance. Focusing on realizing the concept, we
previously reported about a main chain decomposable star shaped polymer (STAR polymer).STAR polymer consists of a core unit and several arm units which connect to the core unit with easily
acid cleavable bonding. (Fig.1) The main chain decomposition system is ideal to achieve promoted acid
diffusion at exposed area because it accompanies great molecular weight reduction at exposed area. The
significance of the STAR system had been confirmed for partially protected poly(p-hydroxystyrene)
(PHS) considering arm length and core structure.
Employing p-hydroxy-α-methylstylene (PHOMS) for arm structure, novel STAR polymer with
appropriate glass transition temperature (Tg) could be realized. (Fig.2) Poly PHOMS is known to
undergo acid-catalyzed decomposition from the polymer end. Lithographic performance comparison
between the STAR polymer and the linear polymer as a control using a Micro Exposure Tool (MET)
would be exhibited.
Thermal property change with exposure and dissolution charactersitic will be also discussed. Moreover
main chain decomposition mechanism was investigated with flood EB irradiation.
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Novel Processing Special Topic: Negative-Tone Development II
With 22nm logic node arriving prior to EUV implementation, alternative immersion optical lithographic processes
are required to drive down to smaller feature sizes. There is an ongoing effort to examine the application of the negative
tone imaging (NTI) process for current and future nodes. Although NTI has previously shown difficulties with respect to
swelling, high chemical reactivity with oxygen, and the need for special equipment needed for the solvent-based
development, NTI photoresists (PR) typically exhibit stronger adhesion to silicon than that of positive tone photoresists
(a characteristic that helps mitigate pattern collapse). We will provide suggestions on how to improve the image quality,
as well as the resulting defectivity, for desired geometries. This paper will primarily focus on the full litho process
optimization and demonstrate repeatable, and manufacturable critical dimension uniformity (CDU), and defectivity
optimization for trench and via structures.
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High volume manufacturing capability of negative tone development (NTD) process were discussed in viewpoint of
lithography performance, necessary developing time impacting throughput, pattern defectivity, and CD-uniformity
(CDU). Dense C/H pattern lithographic performances of the latest resist materials dedicated NTD process were
introduced, and the design strategy of these resists were discussed. Best condition of development time was fixed with
the study on development time dependences on CD-uniformity and defectivity. Throughput performance of NTD was
discussed with the necessary development time. Pattern defectivity studies and CDU studies were carried out on L/S
pattern and C/H pattern.
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The chemical waste generated in today's microelectronic fabrication process can be released into the environment and
cause environmental and health concerns. It is therefore necessary to develop an environmentally friendly process that
can eliminate the use of toxic chemical solvents. Silicone fluids are linear methyl siloxanes that only contain carbon,
hydrogen, oxygen and silicon. They are low in toxicity, not ozone-depleting and contribute little to global warming.
They degrade into naturally occurring compounds instead of accumulating in the atmosphere and can be recycled. Their
unique physical and chemical properties have also made them promising developers for lithography. For example, their
low surface tension can eliminate pattern collapse problems associated with high aspect-ratio features. Silicone fluids are
non-polar solvents and their solvent strength is weaker than that of saturated hydrocarbons but stronger than that of the
commercially available saturated hydrofluorocarbons and may be enhanced by adding other solvents. Two conventional
photoresists used in this study, PBOCST and ESCAP are both insoluble in silicone fluids before or after exposure.
However, the solubility of PBOCST and ESCAP in silicone fluids can be increased by using a silicon-containing
additive. In this paper, we demonstrate this novel and environmentally friendly development of conventional
photoresists in silicone fluids.
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In order to continue scaling down the feature sizes of the devices until extreme ultraviolet lithography (EUVL) reaches
to production capability, the alternative methods such as double patterning technology (DPT) and spacer patterning
technology (SPT) are applied for half pitch (hp) 2x~3x nm line / space imaging. In the storage node of DRAM, both
stable hole patterning and high dielectric constant (ε) material development are key factors to secure the capacitance. In
terms of hole patterning, we anticipate that hp 4x nm hole will be possible with combination of vertical and horizontal
lines. However, the patterning process for hp 3x nm hole has to find a solution in trade-off relationship between process
stability, complexity and cost of ownership (CoO) until EUVL is accomplished. In this paper, we will demonstrate 3x
nm hole patterning process using double patterning technology combined with negative tone development (NTD).
Contrary to general method (positive tone development with dark field mask) for hole patterning, intention to use NTD
with bright field mask will first be discussed. Evaluation and analysis of the simulated and experimental results will be
discussed for block CD uniformity improvement. In addition to patterning, overlay performance will be tested through
NXT 1950i to confirm DPT process feasibility. Finally, process integrations including etch process will be
demonstrated.
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The main properties controlling a successful negative-tone development (NTD) process include surface energy of the
BARC or silicon hardmask, reflectivity control, and type of spin-on carbon (SOC) layer utilized. In this paper, we
studied the BARC and silicon-containing hardmask properties needed to achieve successful NTD of a conventional
positive-tone photoresist. The surface energy mismatch between BARC and silicon-containing hardmask poses
challenges for patterning dense structures. Interaction of the SOC layer and the photoresist was observed, even with the
silicon hardmask film present in between these two layers. Strict reflectivity elimination does not guarantee a successful
outcome, rather precise control of reflectivity is required to enhance the overall lithographic process.
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Reversible Addition Fragmentation Chain Transfer (RAFT) polymerization technology enables the production of
polymers possessing low polydispersity (PD) in high yield for many applications. RAFT technology also enables control
over polymer architecture. With synthetic control over these polymer characteristics, a variety of polymers can be
designed and manufactured for use in advanced electronic applications. By matching the specific RAFT reagent and
monomer combinations, we can accommodate monomer reactivity and optimize acrylate or methacrylate
polymerizations (193 and 193i photoresist polymers) or optimize styrenic monomer systems (248 nm photoresist
polymers) to yield polymers with PD as low as 1.05. For 193i lithography, we have used RAFT technology to produce
block copolymers comprising of a random "resist" block with composition and size based on conventional dry
photoresist materials and a "low surface energy" block The relative block lengths and compositions may be varied to
tune solution migration behavior, surface energy, contact angles, and solubility in developer. Directed self assembly is
proving to be an interesting and innovative method to make 2- and even 3-dimensional periodic, uniform patterns. Two
keys to acceptable performance of directed self assembly from block copolymers are the uniformity and the purity of the
materials will be discussed.
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The chemical reactions induced in chemically amplified resists using a molecular glass resist (the seventh Selete
Standard Resist, SSR7) were investigated. Two-dimensional (half-pitch and exposure dose) matrices of resist line width
and line edge roughness (LER) and the remaining resist thickness were analyzed on the basis of the sensitization
mechanisms of chemically amplified resists for extreme ultraviolet (EUV) lithography. The line width, LER, and
remaining resist thickness were successfully reproduced by assuming that LER is inversely proportional to the chemical
gradient. The chemistry of SSR7 was discussed.
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BACKGROUND: The stochastic nature of acid-base quenching in chemically amplified photoresists leads
to variations in the resulting acid concentration during post-exposure bake, which leads to line-edge
roughness (LER) of the resulting features.
METHODS: Using a stochastic resist simulator, we predicted the mean and standard deviation of the acid
concentration after post-exposure bake for an open-frame exposure and fit the results to empirical
expressions.
RESULTS: The mean acid concentration after quenching can be predicted using the reaction-limited rate
equation and an effective rate constant. The effective quenching rate constant is predicted by an empirical
expression. A second empirical expression for the standard deviation of the acid concentration matched the
output of the PROLITH stochastic resist model to within a few percent
CONCLUSIONS: Predicting the stochastic uncertainty in acid concentration during post-exposure bake for
193-nm and extreme ultraviolet resists allows optimization of resist processing and formulations, and may
form the basis of a comprehensive LER model.
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We studied the line edge structure forming in the negative tone process using meso scale simulations. Our simulation is
based on the dissipative particle dynamics (DPD) method. The simulation model of the lithographic process is developed
in which the dynamics of a polymer chain in continuous model can be observed. In the negative tone process, the cross
linking reaction is the key step to obtain the high resolution patterns. First we develop the model for the cross linking
reaction. From our results in the dissolution test of the film, as the density of cross links increases, the soluble film to the
developing liquid changed to the swelling (or insoluble) one. Once the threshold between soluble and insoluble
conditions with changing the number of cross links, we can perform two kinds of simulations; 1) layered model
simulation, and 2) line pattern simulation. In the layered model, more roughened edge can be found in the case of a thick
interface than in the case of a thin interface. Our simulations can be applicable to study the LER problem and the
dynamics of polymer chain including the chemical reaction will be one of the important origins of LER.
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A simple analysis of aerial image quality reveals that negative tone imaging is superior to positive tone for
small dimension contacts and trenches. Negative Tone Development (NTD) of positive chemically amplified (de-protecting)
photoresist is currently the favored method for realizing such images on the wafer.
When experimental process windows are determined for NTD systems, it is apparent that the results far exceed
the upper limit predicted using current physical modeling. Since real data transcends the capabilities of the current model
to predict, some important physical process is clearly missing. In this work, we explore whether resist shrinkage during
PEB can account for the observed discrepancies. Two very simple shrinkage models are developed and tested. Results
show that shrinkage in the vertical direction explains some profile artifacts observed in actual NTD processes but has
negligible impact on conventional positive tone processes. The horizontal shrinkage model reveals that this type of
phenomenon can significantly increase the exposure latitude of a negative tone process but has marginal impact on
positive tone exposure latitude only introducing a small CD offset.
While horizontal shrinkage does enhance exposure latitude appreciably, the effect does not seem large enough
on its own to account for the entire increase observed in the experimental results. Further work is ongoing to investigate
other potential mechanisms for observed behavior.
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Resist CDU and profile control in high-resolution lithography are improved with the use of spin-on bottom anti-reflective coatings (BARCs). Typically, BARCs have not been applied on implant levels because they interfere with the doping process and also because of the cost of performing a reactive-ion etching step to open the BARC in bright areas. As implant CDs shrink to challenging k1 values, reflection control is increasingly required. One solution is to use a reactive-soluble antireflection layer to control CD and profile, thus eliminating the need for an additional etch step. Developable bottom antireflective coatings (DBARCs) provide improved control while minimizing increased cost.
Computer simulation methods are a valuable tool for research and design. Complex reaction phenomena, often difficult to measure experimentally, may be studied within the limits of the models used, and their effect upon the resulting lithography evaluated. In this work, we describe DBARC functionality and application. The physics of a computer model for the study of DBARC is discussed. The effect of the model parameters upon the simulated lithography is discussed. The model is calibrated to experimental data and model predictions are compared to data of resist profiles on DBARC for key features at KrF.
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The increasing density of semiconductor devices has required the development of high resolution exposure techniques.
The miniaturization of feature sizes has been achieved mainly by shortening the exposure wavelength. Extreme
ultraviolet (EUV) lithography at 13.5 nm exposure wavelength will be introduced into pilot lines in 2011, and high
volume manufacturing is expected to be started in 2013/2014. Furthermore, the possibility of extending EUV lithography
down to sub 5 nm has been proposed as next-generation lithography, by reducing the exposure wavelength to 6.x nm.
ASML has estimated the throughput of exposure system for 6.x nm EUV lithography is comparable with 13.5 nm
lithography, based on the experiments such as reflective multilayer optics. However, the estimation has not included the
sensitivities of resist materials, which is one of the most important criteria for the practical lithography systems. Here,
the sensitivities of several kinds of typical resists in EUV/soft X-ray wavelength down to 3.1 nm were actually evaluated
by experiments. The sensitivities of resist materials were roughly proportional to the absorbed dose calculated by line
absorption coefficients of resists. The dependence of the exposure wavelength on EUV resist sensitivity could be
theoretically predicted for the next-generation lithography, if sensitivity at a certain EUV wavelength like 13.5 nm is
experimentally obtained.
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Spin-on underlayers are currently being employed by the lithographic industry to improve
the imaging performance of EUV resists. In this work, multiple examples have shown improved
line-edge roughness (LER) of an open-source resist using new open-source underlayers in
comparison to a primed silicon substrate. Additionally, several experiments demonstrate better
resist adhesion on underlayers that have lower coefficients of thermal expansion (CTE). Both
organic and inorganic underlayers provide better resist LER when their CTE is lower.
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EUV lithography is expected to be an important technology for manufacturing 22 nm node and beyond in the
semiconductor industry. To achieve the desired resist RLS performance for such fine feature patterns, multilayer
materials are almost certainly needed to define the overall lithography process. The resist modeling and experiment
studies suggest high EUV absorbance of the film improves resolution, line width roughness and sensitivity. In this paper,
we report the studies of new EUV underlayers (EBL) based on crosslinkable organic underlayer materials with high
EUV photon absorption (EPA) unit. The lithography results for the new EUV underlayer materials have demonstrated
advantages over conventional organic underlayer in terms of resist sensitivity, resolution, process window, pattern
profile, collapse margin, and possibly line width roughness.
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In the last years, interest in reducing line width roughness (LWR) in EUV lithography through a dedicated process step
has significantly increased. Various post-litho processing techniques to improve LWR without compromising resolution
or sensitivity have been proposed. While these techniques are giving smoothing levels up to 30% before etch, the
important question is of course how efficient they are in the full patterning process.
To evaluate the effectiveness of the smoothing techniques on the EUV resist process and the post-etch pattern, a few of
the most promising techniques have been selected for an evaluation. Post-develop rinse smoothing and solvent vapor
smoothing can reduce the LWR by 10-15%. Ion-beam smoothing is giving higher smoothing values but suffers some
important limitations for its application.
Two case studies of post-litho smoothing followed by a standard etch process reveal that a large portion of the LWR
smoothing can remain after etch, but the LWR gain may also be completely lost. Finally, a plasma smoothing process
combined with a plasma layer deposition is proposed to optimize the etch process itself. Analysis of LWR in the spatial
frequency domain at the different stages of the patterning process gives a better insight into the impact of the different
steps.
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As patterning of implant layers becomes increasingly challenging it is clear that the standard resist/Top Antireflective
Coating (TARC) process may be soon be limited in terms of its ability to meet implant targets at future nodes. A
particularly attractive solution for patterning implant levels is the use of a Developable Bottom Anti-Reflective Coating
(DBARC). Similar to a conventional BARC, a DBARC controls reflectivity from the underlying substrate by absorbing
the incident radiation thereby minimizing detrimental effects of reflected light. However, unlike a conventional Bottom
Anti-Reflective Coating (BARC) which requires a BARC open etch step, the DBARC is developed with the resist in a
single step leaving the substrate ready for implantation. These properties make DBARC very attractive for implant
layers.
In this paper, we report on the development of KrF and ArF DBARCs for implant applications. Our primary interest is
in developing solutions for patterning Post-Gate implant levels. We briefly describe our fundamental design concepts
and demonstrate the concepts are robust as we develop ARTM602 DBARC to address the criteria for a production worthy
DBARC. This includes data on EBR performance, drain line compatibility, sublimation and footing coverage over
topography. In terms of lithographic performance, we demonstrate improved capability over the incumbent SLR/TARC
process in many key areas. This includes through pitch performance, process window and profile integrity over
topography for both KrF and ArF DBARC solutions. Several strategies to enhance profile by resist/DBARC matching
are also demonstrated. From a platform robustness standpoint, we show that AR602 DBARC is ready for high volume
manufacturing in terms of batch to batch control and shelf life.
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In this paper, we propose to bring new insights of the resist chemical modifications induced by HBr plasma treatment by
using thermal desorption-gas chromatography/mass spectrometry (TD-GC/MS) measurements and thermal analysis.
In order to isolate effect of plasma ions and radicals of resist chemical modification induced by VUV plasma light,
samples coated with a model 193nm resist (polymer only and full formulation) and exposed to a HBr plasma (directly or
via a LiF window) are analysed. Our approach, based on TD-GC/MS technique, is an indirect method to monitor the
outgassed by-products during different treatments. Thus the outgassing rate associated with sample exposed directly to
HBr cure plasma is significantly lower that outgassing rate of the samples exposed under LiF window, suggesting plasma
induced surface hardening. Moreover a short O2 plasma treatment seems enough to remove the surface layer.
Quantitative and qualitative TD-GCMS analysis correlated with Thermo-Gravimetric Analysis (TGA) allow us to show
that plasma H+ ions induce resist deprotection .
In conclusion, using such methodology we propose a fine analysis of fundamental mechanisms involved in 193nm resist
modification under HBr cure plasma treatment.
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Underlayers (UL), such as organic planarizing layers (OPLs) or spin-on carbon (SOC) layers, play a very important role
in various integration schemes of chip manufacturing. One function of OPLs is to fill in pre-existing patterns on the
substrate, such as previously patterned vias, to enable lithographic patterning of the next level. More importantly, OPL
resistance to reactive ion etch (RIE) processes used to etch silicon-containing materials is essential for the successful
pattern transfer from the resist into the substrate. Typically, the pattern is first transferred into the OPL through a two-step
RIE sequence, followed by the transfer into the substrate by a fluorine-containing RIE step that leaves the OPL
pattern mainly intact. However, when the line/space patterns are scaled down to line widths below 35 nm, it was found
that this last RIE step induces severe pattern deformation ("wiggling") of the OPL material, which ultimately prevents
the successful pattern transfer into the substrate.
In this work, we developed an efficient process to evaluate OPL materials with respect to their pattern transfer
performance. This allowed us to systematically study material, substrate and etch process parameters and draw
conclusions about how changes in these parameters may improve the overall pattern transfer margin.
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For chemically amplified EUV resists, secondary electrons derived from ionization events play a critical role
in the sensitization of acid generators. In this study, we show the dependence of acid generation efficiency on
dose rate (fluence per pulse duration) by using 61 nm free-electron laser (FEL) light irradiation. The
wavelength of 61 nm (20.3 eV) is applied because single incident photon induces only single ionization event,
in contrast to the 13.4 nm EUV photon that induces 4.2 ionization events on average. The acid yield
efficiency has enhances with decreasing the dose rate. It is suggested that high density ionization enhances the
multiple spur effect.
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One of the most promising resist design strategies for the development of high resolution materials for EUV
lithography is the PAG anion-bound polymer approach. We have published several reports in the past
few years on the structure/property relationships of anion bound PAG resist polymers. This paper will
focus on relative performance of novel bound PAG polymers in EUV and electron beam lithographies. We
will analyze the performance characteristics of a series of well characterized bound PAG resist polymers
using several polymerizable PAG monomers. Due to the limited access to EUV exposure tools, we
analyzed the initial lithographic performance with electron beam lithography for improved cycles of
learning. We have found several examples of poor correlation between EUV and e-beam (EB) lithography
results. We will offer rational for the difference in performance, with the goal of improved insight into both
EB and EUV resist design.
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Chemically amplified photoresists require a post exposure bake (PEB), typically on a hot plate at 90-150°C for
30-120 seconds, to catalytically deprotect the polymer backbone. During PEB, excessive diffusion of the
photo-generated acid results in loss of line edge definition, blurring of latent images and changes in the line edge
roughness. Both acid diffusion and deprotection are thermally activated processes, with the relative rates affected by the
time/temperature profile of the PEB. In this work, we introduce an alternate PEB method involving millisecond time
frame heating over a temperature range of 300°C to 420°C using a continuous wave CO2 laser. A methodology is
developed for characterizing the resist deprotection and acid diffusion kinetics under laser PEB (l-PEB) and comparing
the behavior with conventional hot plate PEB. Results show that the deprotection rate sensitivity with temperature is
smaller for l-PEB compared to that of hot plate PEB, suggesting a possible change in the deprotection mechanism. Acid
diffusivity under l-PEB is reduced by a factor of 102-103 compared to values extrapolated from the hot plate PEB data.
Under EUV exposure, patterns formed using l-PEB show significantly smoother surface roughness while requiring less
than half the dose required for hot plate PEB - a direct consequence of enhanced deprotection at high PEB temperature
and reduced acid diffusion in the millisecond time frame.
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Increasing complexity and manufacturing costs, along with the fundamental limits of planar CMOS devices, threaten to
slow down the historical pace of progress in the semiconductor industry. We have proposed and demonstrated proof-of-concept
of a simple and low-cost way to fabricate dual-damascene copper (Cu) on-chip interconnect or Back-End-Of-the-
Line (BEOL) structures using a novel multifunctional on-chip electrical insulator called a photo-patternable low
dielectric constant (low-κ) dielectric (PPLK) material [Q. Lin, et al, Proc. SPIE, 2010]. This demonstration was
accomplished with a silsesquioxane-based (SiCOH), κ=2.7 material which is compatible with 248 nm optical
lithography.
In this paper, we report on the extension of the photo-patternable low-κ concept to the ultra-low-κ (κ<2.5) regime and
resolution down well below 100 nm with 193 nm lithography as well as e-beam lithography. We have accomplished this
demonstration using the same silsesquioxane-based (SiCOH) material platform as that of the 248 nm photo-patternable
low-κ materials. The 193 nm photo-patternable low-κ materials possess dielectric constants below 2.5 and are able to
resolve 100 nm half-pith line/space features with dry 193 nm single exposure lithography. The resolution of photopatternable
low-κ materials can be pushed down to 40 nm half-pith line and space features with a line-edge-roughness
less than 3.0 nm with e-beam lithography.
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Resist supplier has successfully demonstrated applying negative tone resist into ArF lithography. It is capable of
achieving 50nm dense line and <30nm isolated space pattern by over dose operation in topcoat-free immersion
lithography. Additionally, using ArF dry system with double exposure could also realize 65nm gridded contact hole
patterns. For specific application, negative PR ArF lithography has better benefit of cost and process control capability
than other approaches. In this paper, we have determined process capability of 65nm gridded contact hole by ArF dry
double patterning and compared with LELE process in terms of DOF, EL and CDU and cost. By continuously
optimizing process parameter, >0.21um DOF and 4.6nm global CDU are achieved on DRAM capacitor process. It
revealed strong relation to development parameter setting. Furthermore, specific pattern formation considering optical
items, ex: OPE, NRF (non-resolution feature) and interaction between double exposure have also been analyzed and
difficulties of generating a specific pattern with negative tone resist double exposure have been figured out.
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We have developed a transparent, high refractive index inorganic photoresist with significantly higher etch resistance
than even the most robust polymeric resist. As feature sizes continue to decrease, film thickness must be reduced in
order to prevent pattern collapse. Normally thinner films prevent sufficient pattern transfer during the etch process,
creating the need for a hardmask, thus increasing production cost. Compared to PHOST, we have shown over 10 times
better etch resistance. Organic photo-crosslinkable ligands have been attached to a hafnium oxide nanoparticle core to
create an imageable photoresist. This resist has shown superior resolution with both E-beam and 193 nm lithography,
producing sub-50 nm patterns. In addition to improved etch resistance, the inorganic photoresist exhibits a high
refractive index, increasing the depth of focus (DOF). The nanoparticle size of ~ 1-2 nm has the potential to reduce line
edge roughness (LER).
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Non-conventional chemically amplified (CA) negative resist for EUV lithography was studied. We have
designed negative-tone EUV resist based on thiol-yne stepwise radical reactions. OH groups of
poly(4-hydroxystyrene) (PHS) were modified with functional units bearing C-C triple bond structure. Resist was
formulated as a mixture of modified-PHS, multifunctional thiol compound, and photoradical generator. The
present resist was developable with standard 2.38 wt% TMAH aq. solution. Photo-sensitivity of the resist was
obtained on irradiation at 254 nm and 13.5 nm. The resist was highly sensitive to EUV exposure. The sensitivity
and the contrast were affected by the structure of modified-PHS and process conditions.
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There is a growing interest in the fluorinization of resist materials in improving pattern formation efficiency for extreme
ultraviolet (EUV) lithography. The increased polymer absorption coefficient obtained through this resist platform is
expected to enhance acid production and in effect improve pattern formation efficiency. Our work over the past several
years has shown that the main-chain fluorinated base resins realized by the co-polymerization of tetrafluoroethylene
(TFE) and norbornene derivatives offer high dissolution rates. Based on this, a EUV resist which was prepared using the
by the fluorinated polymers was investigated. Imaging evaluations, using the small field exposure tool (SFET by Canon /
EUVA) with annular (σouter 0.7 / σinner 0.3) illumination conditions were performed. Relatively high sensitivity of
6.3mJ•cm-2 for half-pitch (hp) 45nm and satisfactory resolution limit of hp 40nm was achieved. At present, line width
roughness (LWR) was measured at comparatively large values of more than 8.4nm at hp 45nm. This shows that further
material and process optimizations may be necessary to improve its present lithographic capability. However, these
initial results have shown the potential of fluorinated-polymer based platform as a possible solution for high sensitivity,
high resolution and low LWR EUV resists. In this paper, we report recent results of high sensitivity of 5.1mJ•cm-2 for
half-pitch (hp) 40nm, optimization of protecting groups and photo acid generators
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The trade-off among resolution, sensitivity, and line edge roughness (LER) is the most serious problem in actualization
of extreme ultraviolet (EUV). As feature sizes are reduced, it becomes very strict to simultaneously meet these
requirements. Also, reaction in resist materials induced by EUV photon is more complicate. In chemically amplified
EUV resists, not acid generator but polymers mainly adsorbed EUV photons. The secondary electrons are generated from
polymer upon exposure to ionizing radiation such as EUV radiation and electron beam. Therefore, the increase in
secondary electrons generated by EUV photons adsorbed in resist film is very important factor in the resist design.
Therefore, it is essential to know the ionization mechanisms of backbone polymers and understand the reaction
mechanism in details in order to accomplish high sensitivity and ultra-fine pattern in EUV lithography. We investigated
the photoelectron spectra of typical backbone polymers for chemically amplified EUV resists using ultraviolet
photoelectron spectroscopy (UPS). Also, the structure degradations in polystyrene (PS) derivatives thin films induced by
EUV radiation were analyzed by X-ray photoelectron spectroscopy (XPS) and UPS.
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Extreme ultraviolet (EUV) lithography is one of the most promising technologies for achieving 22nm HP lithography
and beyond. EUV resist is required to improve resolution limit down to less than 20nm hp. To achieve such a
performance, innovative materials' development is necessary under ultra-thin resist film condition for preventing line
collapse. In addition, more refined etching processes compatible with ultra-thin resist film are needed.
In this study, we will report our several approaches for both materials and processes towards forming less than 20nm HP
pattern under ultra-thin film condition. We will also introduce our tri-layer system formed with combination of Si-ARC
stack and organic hard mask (OHM) stack for refined etching process.
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We evaluated reactivity of photoacid generators for EUV resist using the quantum chemical calculation. As the
secondary electron from the polymer in resist causes the reaction of photoacid generator, the reactivity of photoacid
generator is determined as its electron affinity. We performed optimization of the molecular structure with and without
electron addition to the photoacid generator and calculated each molecular energy. We defined the absolute value of the
difference of molecular energy as the stabilization energy, which can be the electron affinity of photoacid generator.
The typical substituents to photoacid generators of triphenylsulfonium trifluoromethanesulfonate and
tricyclohexylsulfonium trifluoromethanesulfonate were investigated. We found that incorporation of electron
withdrawing group enhances the reactivity of photoacid generators.
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In general, contact hole patterning has various challenges such as narrow process window, large mask error
enhancement factor (MEEF), poor circularity, and low image contrast compared to line & space patterning.
For that reason, it is difficult to make sub-50nm size contact hole with 193nm ArF immersion single exposure.
In order to achieve sub-40nm contact hole patterning, we have need of shrink bias over 20nm. However,
conventional pattern shrink technology such as resist reflow process is difficult to get shrink bias over 20nm
because the shrink volume gets smaller as the pitch gets narrower. Recently several authors have specifically
noted the advantages of using negative tone development for patterning narrow trenches. A new negative tone
imaging with application of new developer to conventional ArF immersion resist materials is proposed for
small contact hole pattern formation. Significantly better LWR and resolution on small contact hole pattern
were observed with this negative tone development compared with positive tone development.
In this paper, we will introduce the experimental results of sub-40nm contact hole patterning using negative
tone systems for contact hole patterning. We will report the results of comprehensive studies of defects
originating in negative tone photolithography and reveal the defect generation mechanism of each negative
tone imaging-specific defect types.
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Exceptional post exposure delay (PED), CD stability, up to 72 hours was reported. This study was conducted using two
negative resist formulations identical in their composition except for their PAG type. A mechanism by which the
photoacid is protected from relatively moderate levels of airborne amines is proposed. Evidence of room temperature
interaction between the resist components and the acid during post exposure delay was also suggested. Therefore, the
PED outcome could be the result of two opposing mechanisms.
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Chemical flare has been shown to be a process limiter for patterns that are surrounded by areas of unexposed resist for
certain chemically amplified resists. Using a pattern known to be susceptible to chemical flare effect a method was
developed and tested on several materials. Details of the testing patterns, consisting of placements of small and large
pattern density areas set to provide multiple degrees of resist loading; and a second level of loading variation achieved by
selective exposure locations of those patterns across the wafer are given. Descriptions of the determination of slopes from
linear trend-lines of the critical dimensions responses can be used to provide a gauge for internal evaluations as well as
feedback to the vendors for chemical flare sensitivity.
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The influence of degree of copolymerization of poly(styrene-ran-methyl methacrylate) [P(S-MMA)] on the
deprotonation mechanism for EUV chemically amplified resists were investigated by pulse radiolysis, quantity of the
acid yield, and density functional theory methods. The degradation of MMA unit occurs immediately before the hole
transfer to the styrene unit in P(S-MMA) in the low PS mole fraction (< 50 %). The hole transfer from MMA unit to
styrene units occurred in the high PS mole fraction (> 70 %). It is assumed that the formation of styrene multimer (n > 3)
causes the hole transfer.
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In chemically amplified (CA) resist systems, photo-chemically generated acid can diffuse in resist matrix and the
acid induces the de-protection reaction of resists. To control the rate of the de-protection reaction, small amounts
of amines must be added as a quencher. The concentration of amines in resist matrix should be constant during
the post-exposure-bake (PEB) treatment. In the practical resist processes, organic bottom anti-reflective coating
(BARC) is essentially important to provide reflectivity control for resist patterning. In this study, we have
studied the diffusion characteristics of amines from resist layer to BARC layer by bake treatment. The amine
concentration in resist layer was estimated using the rate of de-protection reaction of conventional CA resist. It
was found that the diffusion rate of amines from resist layer to BARC layer was negligibly low.
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Factors such as post-develop hydrophobicity, polymer aggregation and acid diffusion length are driving forces in the
formation of micro bridging defects. In this report, solutions for each possible cause are proposed and tested. It is proven
that micro-bridging levels can be significantly reduced through a multi-tiered approach.
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As critical dimensions continue to shrink in lithography, new materials will be needed to meet the new demands
imposed by this shrinkage. Recently, there are needs for novel materials with various substrates and immersing process,
including double patterning process, a high resolution implant process, and so on. Among such materials, Developable
Bottom Anti-reflective Coating material (DBARC) is a good candidate for high resolution implant application as well as
double patterning. DBARC should have reflectivity control function as an ordinary BARC, as well as an appropriate
solubility in TMAH-based conventional developer after exposure and bake process. The most distinguished advantage of
DBARC is to skip BARC etch process that is required in normal BARC process. In spite of this advantage, the
photoresist profile on DBARC could be influenced by components and process conditions of DBARC. Several groups
have tried to solve this issue to implement DBARC to new process.
We have studied material-related factors affecting photoresist profiles, such as a polymer, photo-acid generators
(PAGs), and additives. And we explored the effect of process condition for photoresist and DBARC. In case of polymer,
we studied the effect of dissolution rate in developer and crosslinking functionality. For PAGs and additives, the effect
of acid diffusivity and cross-linking degree according to their bulkiness were examined. We also evaluated coated film
stability in a photoresist solvent after BARC bake process and compared lithographic performance of various DBARC
formulations. In addition, the effect of photoresist profile with bake condition of photoresist and DBARC were
investigated. In this paper, we will demonstrate the most influential factors of DBARC to photoresist profile and
suggest the optimum formulation and process condition for DBARC application.
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The photopolymerization kinetics of 4-(vinyloxy)butyl methacrylate containing cationic and free radical polymerizable
vinyl groups was studied by real-time Fourier transform infrared spectra (RT-FTIR) .The cationic polymerizable vinyl
ether moieties(Vc) of the hybrid monomer in solution polymerized rapidly by exposure to UV light in presence of a
cationic photoinitiator such as an iodonium salt or suflonium salt .High conversions, of 90%, were obtained for most of
the systems investigated. The efficiency of the cationic photoinitiators in initiating the polymerization of the vinyl ether
moieties (Vc) of the hybrid monomer was in the order: suflonium salt > iodonium salt . The free radical polymerizable
methacrylate groups (Vr) of the hybrid monomer in solution polymerized by exposure to UV light in presence of a
radical photoinitiator such as 2,4,6-trimethyl benzoyl diphenylphoshine oxide (TPO), 2-isopropyl thioxanthone (ITX) ,
Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (Irgaure 819), 2-Methyl-4'-(methylthio)-2-morpholinopropiophenone
(Irgaure 907). Among the photoinitiators , the best effect in initiating the polymerization of methacrylate groups (Vr) of
the hybrid monomer is initiator Irgaure 907.
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The use of acid sensitive dyes to determine the quantity of acid generated from PAG and in the
analysis of acid-generating reaction is currently being studied. The method would allow an easy
understanding of the PAG acid-generating reaction simply by adding an acid sensitive dye to the
resist. In the conventional method, a resist containing a chromogenic substance is applied to a quartz
substrate, which is then exposed. Following the exposure, the absorbance of chromogenic
component near 530 nm is measured and evaluated with a spectroscope. The rate constant for acid
generation (Dill's C parameter) during the exposure is determined based on the relationship between
transmittance at 530 nm and the exposure dose. However, the chromogenic substance used in this
method degrades over time (fading reaction) after the exposure, resulting in variations in
transmittance measurements due to the effects of time between the completion of the exposure and
the measurement of transmittance. We devised a prototype instrument capable of in situ
measurements of absorbance at 530 nm while irradiating a 193-nm light beam. Using this instrument,
we obtained rate constants for acid generation (Dill's C parameter) and examined the differing
results obtained with ArF resist polymers of differing PAG concentrations and structures as well as
dependence on the quantity of the chromogenic substance.
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For a purpose of decreasing a defect risk, a primary structure of a polymer such as molecular weight, composition of
comonomer and its sequence plays significantly important roll. Concerning to a typical radical polymerization, molecular
weight and composition are controllable by regulating feed rate of initiator and monomers. At first, a simulation program
predicting the radical polymerization was constructed. Then, the conventional polymerization procedure was modified
by simulation to give the ideal primary structure. After that, the optimized procedure was verified by an actual
experiment. The obtained homogeneous polymer showed good lithographic performance. In addition, a direct
observation of the developed surface was achieved by scanning probe microscopy.
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As integrated circuit fabrication continues to advance towards the 22 nm node and below, it has become clear that
although line edge roughness and resolution are important, other issues such as pattern collapse must be addressed in
order for technology to continue to progress. One of the primary modes of pattern collapse at small feature sizes is
adhesion failure caused by loss of adhesion of the resist to the substrate during the drying process. The main forces
which govern pattern collapse by adhesion failure are related to substrate/resist interactions. Significant research has
been conducted to find methods for reducing capillary forces, such as use of surfactants in rinses, to reduce pattern
collapse. However, the use of spin drying has also been observed to exhibit other collapse related effects that are not
sensitive to such treatments. To this end, in this work a reactive adhesion promoter capable of covalently attaching to
hydroxystyrene-based positive tone resist copolymers has been developed and demonstrated. A vinyl-ether-modified
silane was prepared and effectively applied using a solution silanization reaction. A model hydroxystyrene-based
positive tone resist was applied and subjected to post apply bake to cause reaction of the surface modifier with the
photoresist to occur prior to patterning using e-beam lithography. Contact angle studies and ellipsometry were used to
characterize the surface silanization reaction. Pattern collapse test structures were fabricated and analyzed after
development and drying on the different surfaces to quantify the impact of the use of the covalent surface linker and
compare it to more standard adhesion promoter processes such as those utilizing hexamethyldilazane (HMDS). The
effect of soft bake condition on the performance of the reactive adhesion promoter has also been studied. Ultimately, the
results of critical stress analysis and SEM studies of the resulting patterns confirm that use of surface priming agents that
covalently attach the resist to the substrate can significantly enhance resist-substrate adhesion and dramatically reduce
pattern collapse.
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Pattern collapse has become an issue of increasing importance in semiconductor lithography as the size of critical
features continues to shrink. Although models have been proposed to explain the observed pattern collapse behavior, the
ability of such models to quantitatively predict the collapse behavior has been limited without significant model fitting to
experimental pattern collapse behavior. Such a need to collect extensive collapse data before these models can provide
any predictive capability limits their use and in general does not provide further insight into the underlying root causes of
the observed behavior in many cases. This is particularly true at small feature sizes for resist lines smaller than
approximately 70 nm in width. In this work, a comprehensive pattern collapse model that accounts for both adhesion
based pattern failure and elastoplastic deformation-based failure is used. Furthermore, the required model parameters
are extracted from basic experiments on the resist materials and substrates themselves without the need for actual
patterning experiments. For example, the resist mechanical modulus behavior is determined from simple thin film
buckling experiments. The results of these simple tests are quantitatively predictive pattern collapse models for a
particular resist-substrate combination that capture complex effects such as the dependence of the collapse behavior on
resist film thickness and feature size due to feature size dependent polymer modulus behavior. Application of these
models and experimental methods to an experimental resist and comparisons of the model predictions versus actual
experimental pattern collapse data are shown and discussed to validate the methodology.
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As the semiconductor industry continues to push the limits of the lithography processes used to fabricate integrated
circuits, pattern collapse during development and drying can have a substantial impact on process viability. This pattern
collapse in general is caused by unbalanced capillary forces present during the drying step of the lithographic process.
Significant research has focused on developing methods to reduce such capillary forces and improve the pattern collapse
of photoresists. However, it appears that relatively little attention has been paid to other process dependent factors
which may also significantly impact such collapse behavior. For example, another potential factor which may affect
pattern collapse is the length of time during which the resist features are actually stressed during drying. As such,
processes which result in different drying rates may be expected to yield different levels of pattern collapse. In this
work, e-beam lithography was used to generate high resolution line-space pair arrays which contain different size spaces
between a pair of adjacent lines in a model chemically amplified resist. Such line pairs present an excellent tool for
studying pattern collapse and quantifying the level of stress required to cause collapse and failure of resist features.
After development and rinse, such pattern collapse test structures were dried using a variety of different processes
possessing a variety of different drying rates, and the impact of these different drying methods on pattern collapse was
quantified. It was indeed found that drying rate has a dramatic impact on pattern collapse, with spin drying techniques
performing better than most other techniques. However, it was discovered that such spin drying methods also yield a
significant pattern orientation dependence of the degree of pattern collapse. Such behavior is explained in terms of
additional mechanical forces caused by the centrifugal forces exerted during spin drying methods.
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Molecular glass resists have gained attention for the past decade as a potential platform
for high resolution lithography. Several molecular resist materials based on the
calix[4]resorcinarene system have been developed. Though this molecular system is very
versatile, there are several challenges with the synthesis and processing of these
materials. The difficulty to synthesize a monodipserse unit, the poor solubility in casting
solvents and incompatibility with conventional developer are some noted challenges. We
have addressed these issues by designing a new calix[4]resorcinarene resist material with
hexafluro alcohol (HFA) units. The resist platform has been evaluated with e-beam and
EUV lithography.
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The semiconductor industry is pursuing several process options that provide pathways to printing images smaller
than the theoretical resolution limit of 193 nm projection scanners. These processes include double patterning, side
wall deposition and pitch division. Pitch doubling lithography (PDL), the achievement of pitch division by addition
of a photobase generator (PBG) to typical 193 nm resist formulations was recently presented.1 Controlling the net
acid concentration as a function of dose by incorporating both a photoacid generator (PAG) and a PBG in the resist
formulation imparts a resist dissolution rate response modulation at twice the frequency of the aerial image.
Simulation and patterning of 45 nm half pitch L/S patterns produced using a 90 nm half pitch mask were reported.2
Pitch division was achieved, but the line edge roughness of the resulting images did not meet the current standard.
To reduce line edge roughness, polymer bound PBGs and polymer bound PAGs were investigated in the PDL resist
formulations. The synthesis, purification, analysis, and functional performance of various polymers containing PBG
or PAG monomers are described herein. Both polymer bound PBG with monomeric PAG and polymer bound PAG
with monomeric PBG showed a PDL response. The performance of the polymer bound formulations is compared to
the same formulations with small molecule analogs of PAG and PBG.
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In this paper, we report current performance of the negative-tone molecular resists based on calix[4]resorcinarene (CRA)
by Electron Beam Lithography (EBL). We have developed hydroxyphenyl calix[4]resorcinarenes (H-CRAs) designed
hydroxy-groups outer to adhere patterns to wafers. Hydroxy groups help patterns adhere to wafers, to restrain collapse of
patterns. Moreover, we additionally controlled hydrophobicity of H-CRA by the alkyl-groups (R), which make the
sensitivity higher. The negative-tone resist based on these H-CRAs shows well-defined 25-50nm half-pitch patterns, and
the increase in hydrophobicity of H-CRA by the alkyl-groups (R) made the high sensitivity. Furthermore, the
optimization of these resist formulation improved sensitivity and LER.
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In the advanced semiconductor lithography process, the tri-layer process have been used for the essential
technique{photoresist/ silicon contained hard mask (Si-HM) / spin on carbon hard mask (SOC)}(Figure 1). Tri-layer
process was introduced and applied to the L/S and C/H patterning in the ArF dry and ArF immersion lithography process.
Therefore, Si-HM should have the wider compatibility with different photoresist. In this paper, we investigate the
interface behavior between photoresist and Si-HM in detail and get the new Si-HM to have the wider compatibility with
different photoresist.
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As decreasing the device feature size, the film stack structure used in resist process is also changing. Especially multilayer
stack film structure is getting popular for pattern formation on critical layers. Our approach is to form a spin-on
hard mask film with high etch resistance by introduction of a new baking function. The results show that a spin-on hard
mask film processed by an underlayer coating system of Tokyo Electron Ltd. (TEL) has drastically improved etch
resistance compared to a conventional system. We will report the availability of new underlayer system using several
kinds of underlayer materials.
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Traditional implant layers are becoming increasingly complex in design and continuously pushing
resolution limits lower. In response, developer-soluble bottom anti-reflective coatings (DBARCs) were
introduced to meet these more challenging requirements. These DBARCs excelled over the traditional
combination of single-layer resist and dyed resist/top anti-reflective coating (TARC). DBARCs offered the
resolution and critical dimension (CD) control needed for the increasingly critical implant layers.
Lithographic performance, focusing on CD control over topography and through-pitch behavior,
demonstrated the inherent benefit of the DBARCs over the alternative solutions. Small-space residue
testing showed the benefit of photosensitive (PS) DBARCs for cleanout of sub-100 nm trenches. A study
of improved post-develop residue in various ion-implantation processes validated the use of new DBARC
materials in implant layers.
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Unlike optical systems, electron-charging effect is a concern for e-beam lithography. Accumulated charge on the
resist will perturb the route of incident electrons, resulting in pattern distortion or failure. Therefore, reducing charge
accumulation becomes an important topic for high-pattern-density e-beam applications.
In this paper, we used a conductive material as the resist substrate for charging effect evaluation. The e-beam source
from CD-SEM (Critical Dimension SEM) was initially used to conductive performance qualification. When comparing
with non-conductive BARC, we found that the experimental conductive material has an additional 11% to 14%
resist-shrinkage than a non-conducting BARC. However, we cannot repeat this phenomenon in the multiple-e-beam
(MEB) imaging tool. From Monte Carlo simulation, the electrons deeply penetrate through the substrate instead of being
trapped in the resist substrate. It further indicates that although conductive bottom layer can dissipate electron effectively
for surface charging, the film scheme as well as tool grounding are also important for minimizing the charging effect.
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Electron beam lithography has great potential for future production of nano-imprint templates, light-emitting diodes,
solar cell devices, actuators, biosensors, and micro electro mechanical systems (MEMS) where continued success
ultimately requires improvements in current processing technologies. Electron beam lithography is promising for
advancing multiple electronic applications due to several advantages such as high resolution, deep depth of focus,
flexibility in material design, and assumable cost.
This study presents progress in the development of a new plant-based resist material (TPU-EBR1) to achieve high
exposure sensitivity and lower film thickness shrinkage by electron beam irradiation. Highly efficient crosslinking
properties and high quality patterning line images were provided by specific process conditions of 30 keV electron beam
lithography. Lower film thickness shrinkage of the newly developed TPU-EBR than that of the referenced acrylate type
resist material is one of key to achieve EB patterning. The validity of our approach using the developed TPU-EBR was
confirmed experimentally.
In addition, this new approach was demonstrated to apply glucose and dextrin derivatives as the eco-friendlier
compounds to the resist materials in micro and nano-patterning processes for environmentally-compatible electronic
device fabrications.
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We describe the development of new triphenylsulfonium photoacid generators (TPS PAGs) with semifluorinated
sulfonate anions containing glucose or other natural product groups, and their successful application to patterning sub-100 nm features using 254 nm and e-beam lithography. The TPS PAGs with functionalized octafluoro-3-oxapentanesulfonate were synthesized efficiently in high purity and high yield by utilizing simple and unique chemistries
on 5-iodooctafluoro-3-oxapentanesulfonyl fluoride. The PAGs has been fully evaluated in terms of chemical properties,
lithographic performance, environmental friendliness or toxicological impact. The PAGs are non-toxic and it is
susceptible to chemical degradation and to microbial attack under aerobic/anaerobic conditions. These new PAGs are
very attractive materials for high resolution photoresist applications and they are particularly useful in addressing the
environmental concerns caused by PFOS and other perfluoroalkyl surfactants.
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A series of silicon-containing hybrid monomers which contained both vinyl ether group and allyl ether group had been
synthesized. The monomers' photo-polymerization kinetics was investigated with RTIR. Results showed that the hybrid
monomers could photo-polymerize effectively and both free radical and cationic polymerization processes were
improved. When PAG201 (a kind of cationic photo-initiator) was introduced into the monomers, the conversion of vinyl
ether double bond increased sharply. The final conversion was close to 100%, and at the 6 sec, the polymerization
achieved maximum. At the same time, the allyl ether double bond left. When 2-Isopropylthioxanthone (ITX, a kind of
free radical photo-initiator) was introduced into hybrid system containing PAG201, the final conversion of allyl ether
double bond and polymerization rate (Rp) increased obviously. It was demonstrated that the hybrid silicon-containing
monomers polymerized rapidly and completely with both of the free radical and cationic photo-initiators. The property
showed that the five monomers can be used in nanoimprint resist system or UV imaging materials.
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Hard mask resist material on photoreactive underlayer material was investigated to modify the film surface chemical
adhesion between resist material and photoreactive underlayer material during ultraviolet irradiation of nanoimprint
lithography. This procedure is proven to be suitable for resist material design and the process conditions of ultraviolet
curing nanoimprint lithography for the reduction of defect numbers by template contamination when the template was
removed from the hard mask resist after ultraviolet irradiation. The developed hard mask type silicon resist material with
ultraviolet crosslinking epoxy groups produced high resolutions (80 nm) at a good aspect ratio, and excellent patterning
dimensional accuracy by the replication (number of cycles: 32). The newly resist material and the process conditions are
expected as one of the defect less nanoimprint lithographic technologies in next generation electronic devices.
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In this work a few α-disulfone compounds with different substituents were prepared by a simple nitric acid oxidation of
corresponding disulfonylhydrazines which were prepared by reaction of sulfonyl chloride and aqueous hydrazine. Most
of the compounds are soluble in common organic solvents for photoresists. The thermal decomposition temperatures of
the compounds were detected to be above 190 °C. The UV absorption spectra of the α-disulfone compounds were
measured with the absorption peaks (λmax) around 250 nm. Quantum yields of the disulfone compounds in solution were
determined to be in the range of 0.4-0.6 with low pressure Hg lamp as exposure light source.
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Chain scissioning resists do not require addition of photoacid generators to function. Previously reported chain
scissioning polysulfone resists were able to achieve enhanced sensitivity by incorporation of absorbing repeat units, but
these groups also inhibited the depolymerization reaction, which could further enhance sensitivity. Here we report the
development of sensitive polysulfone chain scissioning resists for 193 nm that are able to undergo depolymerization. The
effect of depolymerization of LER is also discussed. These polymers underwent CD shrinkage upon overdose, which
may be useful for double patterning processes.
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This work deals with recent advances in the microfabrication process technology for medium to high-aspect ratio
structures fabricated by UV photolithography using different kinds of photoresists. The resulting structures were used as
molds and will be transformed into metal structures by electroplating. Two types of photoresists are compared: epoxy-based
(negative) SU-8 and acrylate-based (negative) Intervia BPN. This work was prompted by the need to find an
alternative to SU-8 photoresist which is difficult to process and remove after electroplating. The results presented in this
paper open up new possibilities for low-cost processes using electroplating in MEMS applications.
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It is common knowledge that the semiconductor industry continues to shrink the features contained in integrated circuits
to increase speed and density. Each time the critical dimension (CD) shrinks, new challenges arise to impede the
progress to attain smaller feature sizes, and control over surface reflectivity becomes even more important. Single-layer
bottom anti-reflective coatings (BARCs) have been used in photolithography processes for years to reduce substrate
reflectance, thus reducing or eliminating CD swing, reflective notching, and standing waves. Continued use of this
solution is highly advantageous because it is well-known and cost-effective. This paper will describe a cutting-edge
BARC system that has tailorable optical constants designed specifically to greatly improve immersion lithography
process latitude. This BARC system can be easily modified to make formulations that match many different substrates
that are being used in new devices, including highly absorbing substrates (nitrides), reflective substrates (oxide), metal
layers, and hardmasks. The optimum optical parameters for this BARC system can be easily achieved through
simulations. This paper will exhibit the correlation between optical simulations and lithography results.
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Directed self-assembly (DSA) of block copolymers has gained significant attention in recent years as a possible
alternative for large area fabrication of future sub-30 nm lithographic patterns. To achieve this patterning, at least three
critical pieces are needed: (1) a block copolymer with sufficient immiscibility of the two blocks to drive phase separation
at the low molecular weights required to achieve such small phase domains, (2) a method for selectively removing one
of the blocks after phase separation to achieve formation of a relief pattern, and (3) a method for producing the templated
surfaces used to guide and register the phase separated patterns on the substrate of interest. Current methods for
achieving the patterned substrate template, whether they are of chemoepitaxial or graphoepitaxial nature, are generally
complex involving a large number of steps that are not easily applied to a variety of different substrate surfaces. For
example, numerous substrates have been studied to provide neutral wettability to the styrene-methacrylate (PS-b-
PMMA) block copolymers, such as random styrene-methacrylate copolymer films (PS-r-PMMA) or self-assembled
monolayer (SAM) modified surfaces, which induce perpendicularly oriented morphologies for PS-b-PMMA self-assembly.
In the case of chemical epitaxy processes, a layer of photoresist is generally then coated on such neutral
substrate films and patterned to render commensurability to the periodicity of the PS-b-PMMA being used. The open
(i.e. space) regions in the resist are then exposed to alter their chemistry, e.g. soft X-ray or oxygen plasma exposures
have been used, to achieve hydrophilicity which should preferentially wet PMMA. Finally, the resist is stripped and the
block copolymer is coated and assembled on the template surface. Obviously such multi-step processes would not be
preferred if alternatives existed. As a step toward that goal of making DSA processes simpler, a photodefinable substrate
film that can be used for PS-b-PMMA self-assembly has been developed in this work that is coated, exposed, and baked
in a manner analogous to current optical photoresists. The polymer resin for this material is a form of protected
poly(hydroxystyrene) that is cross-linkable. The new material is suitable for DSA processes using both solvent and
thermal annealing methods. Results of PS-b-PMMA DSA on this new material will be discussed.
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This paper discusses a novel processing technique that uses a combination of negative and positive photoresists for use
with positive photomasks, resulting in masking layers suitable for bulk micromachining in the fabrication of
microelectromechanical systems (MEMS). MicroChem's negative photoresist Nano(TM) SU-8 and Clariant's image
reversal photoresist AZ 5214E are utilized, along with a barrier layer, to effectively convert a positive photomask into a
negative photomask. This technique allows for the use of positive photomasks with negative resists, which opens the
door to the ability to create complementary mechanical structures without the fabrication delays and cost associated with
having to obtain a negative photomask. Furthermore, the SU-8 mask created is robust enough to withstand the bulk
micromachining and aggressive etch chemistries needed to create MEMS structures. This processing technique was
successfully demonstrated by translating a positive photomask to an SU-8 layer that was then utilized as a mask to etch
trenches and other features into a silicon substrate.
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From the perspectives of IC fabrication simplification, cost reduction, and waste material cutback, it is highly desirable
to combine the traditional pattern formation step (lithographical processes) and the pattern transfer step (etch processes)
into a single step. Photo-imageable spin-on dielectrics (PSOD) render it possible to achieve the aforementioned goal.
However, the bestowed dual functionalities on PSOD put great challenges on the material design and development.
PSOD needs not only to match all the performances of the advanced resists, but also to undertake all the duties of the
dielectrics on the chips. We wish to report our modular approach employing Si-containing materials to address the
challenge and to meet the requirements from the different material roles. This paper will also discuss the investigation
and progress on lithographic performance, cure behaviors, thermal stability, and electrical and mechanical properties.
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Silicon-containing antireflection coating (SiARC) and spin-on carbon (SOC) under-layers have been
widely implemented for advanced semiconductor manufacturing since the 45 nm node. The combination
of SiARC and SOC promises a superior solution for reflection control and a high etch selectivity. With
the industry marching towards 22 nm and beyond, the tri-layer materials and processes are being finely
tuned to meet the requirements. We report comprehensive evaluation results of the SiARC (with high
silicon content) and carbon under-layer from manufacturing perspective. It focuses on the performances
that are required to extend the tri-layer applications from the original 45 nm nodes to 22 nm and beyond,
such as thickness selection, etch selectivity, resist compatibility, rework capability, and under-layer
pattern wiggling issues.
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Etching characteristics of various resins by a vacuum ultraviolet (VUV, λ=172 nm) light have been examined under
conditions of exposure time, substrate temperature, radiation distance and ambient oxygen concentration. The VUV light
have used to clean the imprinted molds which are contaminated by organic substances such as ultraviolet-resins through
many times of imprinting processes, and it has revealed that the VUV light has effectively regenerated the contaminated
molds manufactured by quartz, silicon-carbide and nickel.
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As resist films become thinner, so as to reduce problems of aspect ratio related pattern collapse at high-resolution, it is
becoming increasingly difficult to transfer patterns with useful aspect ratio by directly etching the resist. It has become
common to use the photoresist to pattern an intermediate hardmask, which then protects the silicon substrate during
etching, allowing useful aspect ratios but adding process complexity. We have previously described a fullerene based
electron beam lithography resist capable of 20 nm halfpitch and 12 nm sparse features, at a sensitivity of less than 10
μC/cm2 at 20 keV. The fullerene resist has high etch durability - comparable to that of commercial novolac resists - and
has previously demonstrated an etch selectivity of 3:1 to silicon using electron cyclotron resonance microwave plasma
etching with SF6. Here a study of the capabilities of this resist when using Inductively Coupled Plasma etching is
presented. Line-space patterns with half-pitches in the range 25 nm to 100 nm, together with sparse features (~20 nm
linewidth on a 200 nm pitch) were produced in ~30 nm thick resist films using electron beam lithography, and
transferred to silicon using an inductively coupled plasma etcher. Several combinations of SF6, CF4, CHF3 and C4F8process gases were explored. Etch selectivity and anisotropy were studied as a range of etching parameters, such as ICP
and RF power, gas flow rate, pressure and temperature were varied. Etch selectivities in excess of 9:1 were
demonstrated. Techniques for minimizing aspect ratio dependent etching effects in dense features, including the use of
ashing or high etching pressures were also examined.
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Anti-reflective layers benefit CD and profile control in high resolution lithography. Traditionally, they have not been applied to implant levels because the required CD control was less stringent than for other layers. When present a traditional BARC film interferes with the doping process unless removed using a costly dry BARC open etch. Nevertheless, as implant features move to evermore challenging k1 values, reflection control becomes more unavoidable; firstly to control residual standing wave structures on the resist profile and secondly to maintain acceptable CD dimensions on substrates which exhibit large reflectivity variations at both the cross-wafer and the wafer-to-wafer level.
An important consideration for this application is to monitor and minimize intermixing between the resist and DBARC layers. Any method to do so must be sensitive to layers less than 10 nm thickness. The use of ellipsometry is investigated in this work to show the degree to which intermixing, if any, is detectable. A method and its requirements are described that predicts intermixing down to Angstrom thickness. Cross-section SEM shows the effect from an optimized process (no intermixing).
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RRAM is the candidate of next generation new non-volatile memory. The etched stacking film thickness of
RRAM cell pillar is not easy to reduce below 50 nm during CD scaling down since part of RRAM cell pillar
height is removed during CMP polishing of dielectric passivation to expose the pillar top surface for the
following metallization process. Therefore resist pillar pattern with high aspect ratio (AR) is needed to act as
etch mask for defining thick RRAM cell pillar structure. Bilayer resist (BLR) process is most suitable for
forming high AR pattern. Dry develop process is the key step for generating sub-32 nm high AR BLR pillar
pattern. In this study optimization of dry develop process is investigated for high AR pillar with hydrogen
silsesquioxane (HSQ) as upper thin imaging layer for e-beam exposure and AR3-600 as the thick underlayer
for etching resistant.
Experimental results are summarized below. Highest AR of ~6 for HSQ/AR3 BLR semi-dense L/S=1/2 pillar
with vertical profile is obtained under optimized dry develop condition with O2, N2, Ar flow rates, chamber
pressure, top and bottom power of 8, 5, 0 sccm, 1 mTorr, 200 and 100 watts respectively. AR is lower for
looser pattern density. CD variation between HSQ/AR3-600 BLR pillars with different pattern density is
optimized to 5.6 nm. The pillar profile is vertical in vacuum for pattern of any density but distorts more severe
for denser pattern during ventilation to atmosphere. The most critical process parameters for obtaining high
aspect ratio BLR pillar are O2 flow rate and top power. Sidewall profile angle of pillar is mainly dependent on
chamber pressure and bottom power.
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In fine patterning process technology, the pattern shrink process technique is indispensable in addition to pitch
shrink. Tokyo Electron has previously demonstrated the application of this technique to trench-pattern shrink for
dual trench LELE, simple hole shrink for the circular pattern, and rectangle pattern shrink for cut mask of
SADP+line cut. In this paper, we introduce technology that can shrink photoresist for application to a short-trench
and contact hole pattern. Using chemical shrink as a reference for comparison, we report on the effectiveness of
TEL's original ALD SiO2 shrink process. In addition, we propose various contact pitch shrink schemes for
applying double patterning technique.
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Chemically amplified resists are critical for sub-30 nm photolithography. As feature sizes decrease, challenges continue
to arise in controlling the aerial image during exposure, acid diffusion during post exposure bakes, and swelling during
development. Ultimately these processes limit the line width roughness (LWR). While there exists substantial research to
modify resists and exposure protocols, post-development treatment of resist patterns to improve the LWR has received
only modest attention. In this work, we use a scanned laser spike annealing system to anneal fully developed resist
patterns at temperatures of 300-420oC for sub-millisecond time frames. When heated above its glass transition
temperature for a controlled time, patterned resist flows to minimize the surface energy resulting in reduced roughness.
While LWR and critical dimension (CD) of the resist is very sensitive to the hardbake temperature, SEM and AFM
analysis show a >30% reduction in LWR with <1 nm change in CD at 26W (385oC) hardbake power compared to that of
features without hardbake. Quantitative determination of surface roughness, resist trench profiles, LWR, and CD is
presented and discussed.
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Historically, the block layers are considered "non critical ", as ones requiring less challenging ground rules.
However, continuous technology-driven scaling has brought these layers to a point, where resolution, tolerance and
aspect ratio issue of block masks now present significant process and material challenges. Some of these challenges will
be discussed in this paper.
In recent bulk technology nodes, the deep well implants require an aspect ratio of up to 5:1 in conventional
resist leading to small process margin for line collapse and/or residue. New integration schemes need to be devised to
alleviate these issues, i.e. scaling down the energy of the implant and the STI deep trench to reduce resist thickness, or
new hard mask solutions with high stopping power to be dry etched.
Underlying topography creates severe substrate reflectivity issues that affect CD, tolerance, profiles and
defectivity. In addition to the CD offset due to the substrate, the implant process induces CD shrinkage and resists profile
degradation that affects the devices. Minimizing these effects is paramount for controlling implant level processes and
meeting overall technology requirements. These "non-critical" layers will require the development of more complex
processes and integration schemes to be able to support the future technology nodes. We will characterize these process
constraints, and propose some process / integration solutions for scaling down from 28nm to 20 nm technology node.
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The focus of this paper is on the use of SUEX Thick Dry Film Sheet (TDFS) laminates which DJ DevCorp is developing
as a thick resist material in optical and X-ray lithography. Preliminary thick dry film sheets up to 1mm thickness were
successfully prepared and patterned at the CAMD X-ray beamlines and presented at HARMST 2007. Recently, new
results have been published using SUEX resist sheets in UV lithography showing great market potential including
plating molds for metal microparts, polymer MEMS, multilayer microfluidics structures, BioMEMS, medical devices,
wafer level packaging processes, and displays. The SUEX TDFS are available in a range of thicknesses from 100μm to
1mm or more and are pre-cut into a number of standard wafer sizes.
This new material is a modified epoxy formulation containing an antimony-free photo acid generator (PAG) prepared
under a highly controlled solvent-less process which provides uniform coatings between two throw-away layers of
protective polyester film. As part of our initial studies resist layers of 250, 500 and 1000μm were laminated onto regular
silicon wafers using a hot roll laminator at a speed of 1ft/min at 75°C. The entire substrate preparation takes about 1
hour and with practice users can prepare up to 10 substrates in this time which are typically ready to use within 2 hours.
In our efforts to develop a commercially viable product we have conducted experiments using standard equipment
available at CAMD (Quintel UV aligner and CAMD XRLM 1 and 4 beamline). Initial X-ray exposure tests were done
with a bottom dose ranging between 100 and 400 J/cm3 and a top/bottom dose ratio of less than 3 for sheets up to 2mm
in thickness. Exposure time for typical conditions of the CAMD storage ring (ring current ranging between 100 and
160mA, beam lifetime of about 10hrs at 100mA ring current) is about 10-15min for a 4' wafer. After exposure the
samples were immediately post exposure baked between 70°C and 110°C using a convection oven, taken out and cooled
to RT then relaxed up to 3 days before development to reduce stress. Development was done in PGMEA for up to 3
hours for the 1000μm thick samples followed by a short IPA rinse and drying in air.
Very high aspect ratios of 100 or more have been routinely patterned with nearly perfectly straight sidewalls (~1-1.5μm
deviation for a 1mm tall structure) and excellent image fidelity.
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E-beam exposed HSQ resist pillar (island) is commonly used as the hard mask for dry etching. However, HSQ
pillar is prone to collapse without any substrate pre-treatment. CD resolution of HSQ pattern also depends on the
aging effect. In this work, factors of (1) designed CD (DCD) (2) dose vs L/S ratio (3) beam current (4)
underlayer (UL) (5) post-coat-delay (PCD) time before e-beam writing are studied for forming stable and
reproducible sub-22 nm HSQ pillar. Three kinds of underlayer are evaluated, i.e. AR3-600, ZEP520A and
TDUR-N700.
Experimental results are summarized below. A wider dose window of forming sub-22 nm HSQ pillar with looser
L/S ratio or smaller designed CD is obtained. CD variation for all pattern density conditions is due to the
proximity effect from beam blur. AR3-600 is shown to be the most suitable UL for HSQ pillar. CD of HSQ pillar
increases with thicker AR3-600 layer. PCD range for stable CDs of HSQ pillar with DCD of 20 nm is larger than
that with 15 nm.
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Recently, we found a peculiar acid induced defect on chemically amplified photo resist applied to sub-
30nm NAND Flash Memory. This defect is like a hole-pattern with about 1um diameter, and induced by
diffusion of acid which makes photoresist soluble in developer, even though photoresist is not exposed
with KrF. With some experiment results, we found out that HCl gas, by-product of high temperature oxide
which is contained inside voids between two gate lines diffuses into photoresist through high temperature
oxide from voids, makes photoresist soluble in developer, and eventually creates the hole-type defect on
photoresist. To prevent this defect, we can suggest some methods which are substitution of KrF
photoresist into I-line photoresist, modification of oxide deposition recipe to suppress by-product, and
applying of non-CAR (Chemically Amplification Resist) type KrF photoresist not sensitive to acid.
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In this paper we summarize our investigations into processing capability on the CLEAN TRACKTM LITHIUS ProTM -i & TWINSCANTM NXT:1950i litho cluster. Process performance with regards to critical dimension (CD) uniformity and
defectivity are investigated to confirm adherence to ITRS1 roadmaps specifications. Additionally, a study of wafer
backside particle contamination is performed to understand the implications towards processing. As wafer stage chuck
cleaning on the scanner will require considerable down time, this study is necessary to understand the requirements for
manufacturability.
Previous work from our collaboration succeeded in a processing improvement of over 80% in across wafer CD variation
by implementing the newest post exposure bake (PEB) plate design2 and optimized developer process. With regards to
defectivity, the use of the advanced defect reduction (ADR) process with an optimized bevel cut of the resist allowed the
use of a high contact angle material process which is required for optimal immersion hood performance. In this work,
further optimization of the process with consideration of the design concept of the TWINSCANTM NXT:1950i and
hardware modifications on the CLEAN TRACKTM LITHIUS ProTM -i will be performed. From this investigation, it is
expected to understand the process capability of 38nm CD uniformity using novel developer hardware. Additionally, the
defectivity challenges for processing with higher scan speeds in combination with the hydrophobicity of the coating
materials and edge cut strategy will be clarified. Initial evaluation results are analyzed to understand the correlation of
various types and densities of contaminates on the backside of the wafer to the formation of wafer stage chuck focus
spots (FS). Focus spots are a localized irregular focus and leveling height.
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The effect of filtration on defectivity has been studied extensively with line-space patterns. However, the ability to have
defect free contacts is equally as important. Resist materials are specifically designed for contact holes, and therefore it
is important to also study their varied sources of defectivity.
In this study, unpatterned and patterned wafer defectivities have been studied as a function of point of use filter. The
filter retention rating was held constant at 10 nm while the filter membrane material was varied, including ultra-high
molecular weight polyethylene (UPE), Nylon and composite filters. A recommendation will be made as to which point-of-use filter performed best with the contact hole specific resists tested.
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The drive to smaller, less expensive, and faster devices requires radical changes in material development. The increased
material requirements drive complex processes that in turn drive equipment requirements. For the photolithography area
this demand for improved materials is seen in growing requests for device level-specific tuning of organic bottom antireflective
coatings (BARCs) or photoresists for certain imaging requirements, such as numerical aperture, immersion
conditions, and optical parameters. To test and utilize the myriad of BARC materials, there is a need to install them on a
coater-track quickly and efficiently. Installation typically requires a new filter installation, dispense line cleaning, and
usually a minimum of 8-10 L of material to clear out bubbles and other nuisance defects before coating test wafers. As
the number of materials increases, the ability to quickly prime a new filter becomes increasingly important. In this
study, the Entegris IntelliGen® Mini dispense system was utilized to test various pump priming processes to ultimately
minimize the volume purged to reach a defect baseline. In addition, the impacts of the filter media and filter retention on
priming efficiency were studied. Results show that priming processes that were not matched to the filter in use could
actually cause the defects to increase during the process, thus requiring additional purging to reach baseline, and thereby
negating any time or volume savings. Properly programmed priming recipes reduced the purging time and the purging
volume by 50-70%.
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As pattern size becomes smaller, requirement for defect reduction is getting higher and higher. It is known that defects
occur in various steps of lithography process. In this study, we focus on defects related to the resist dispense system. Of
those defects, the most typical is bridge type defect which caused by foreign substances contained in resist film. The
source of those is considered to be insoluble substances, such as resist gels, in resist liquid. So far, the conventional
countermeasure has been the development of resist line filters (optimization of materials, shrinking of pore size, and so
on). But, according to the recent reports and our experimental result, we can say that not only filter type but also
filtration condition has certain influence on bridge type defect generation. In this study, we examine the influences of
resist dispense system and its parameters on bridge type defect generation. This paper provides some experimental data
and introduces our approaches to the optimization of resist dispense system and its effects.
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