Dr. Yong Chang Profile

Dr. Yong Chang

Infrared Device Testing & Modeling Engineer at EPIR Technologies Inc

SPIE Involvement:

Author

Proceedings Article | 3 October 2024 Paper

Thermomechanical modeling and optimization of infrared focal plane arrays: the impact of packaging assemblies

Vineet Kumar, Kiran Sasikumar, Yong Chang, Subramanian KRS Sankaranarayanan, Silviu Velicu, Sushant Sonde

Proceedings Volume 13145, 1314508 (2024) https://doi.org/10.1117/12.3028277

KEYWORDS: Readout integrated circuits, Silicon, Packaging, Metals, Mercury cadmium telluride, Indium, Dielectrics, Design, Sensors, Materials properties

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The established technological standards, architectures, and material choices in the realm of advanced infrared (IR) imaging has enabled the design of high-resolution and high-range IR focal plane arrays (IRFPAs) while minimizing the cost, size, weight, and power consumption of the device. HgCdTe (MCT) has also emerged as the standard choice for the IRFPA device's detector layer as semiconductor material due to its high performance-to-cost, ability to operate optimally at extreme temperatures, and access to new application domains like two-color, active, and passive shortwave infrared (SWIR) imaging. Recent work has focused on a thermomechanical-stress-aware approach for advanced integration of IRFPAs leading to the design of Modified Direct Bond Interconnect (MoDiBI) integration technology which offers the possibility to venture toward design and fabrication of small pixel pitch, large format IRFPAs with longer term operational reliability. In the thermomechanical stress aware approach, finite element modeling is used to predict the effects of cyclic thermal load on the device's components. The device's geometry and materials are optimized based on the prediction.

Hitherto, however, such thermomechanical-stress-aware design has been focused on the detector-readout assemblies. The effect of the IRFPA packaging on the overall IRFPA performance under thermal load remains underexplored. Typically, the packaging involves a Balanced Composite Structure (BCS) sandwiched between the detector chip and the base plate for improving the thermomechanical reliability. In this work, we discuss the impact material choices in BCS has on the induced thermal stresses in critical components of the detector-readout assembly. We show that for an existing intricate and non-linear interplay between the detector chip, Si ROIC, and the BCS components, it may be beneficial to tune the thickness of the Si ROIC and to consider multi-parameter geometry and material optimization for designing IRFPA and packaging assemblies with optimal thermal performance. Further, we also suggest the novel material properties within the BCS stack that yield optimal thermomechanical response in the detector chip for chosen device configurations.

Proceedings Article | 8 June 2024 Presentation

Radiation hardened mid-wavelength infrared FPAs and cameras

Isaac Chang, Sushant Sonde, Silviu Velicu, Yong Chang, Thomas Kroc

Proceedings Volume PC13030, PC1303003 (2024) https://doi.org/10.1117/12.3013371

KEYWORDS: Cameras, Infrared cameras, Mid-IR, Mercury cadmium telluride, Staring arrays, Photons, Particles, Infrared radiation, Electrons, Signal detection

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Proceedings Article | 10 October 2023 Presentation

Optimizing advanced integration technology for large format, small pixel IRFPAs

Sushant Sonde, Kiran Sasikumar, Yong Chang, Subramanian Sankaranarayanan, Silviu Velicu

Proceedings Volume PC12687, PC1268708 (2023) https://doi.org/10.1117/12.2677419

KEYWORDS: Reliability, Mercury cadmium telluride

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Proceedings Article | 11 October 2022 Presentation

Material considerations for vertical integration of IRFPAs (Conference Presentation)

Sushant Sonde, Kiran Sasikumar, Yong Chang, Subramanian KRS Sankaranarayanan, Silviu Velicu

Proceedings Volume PC12234, PC122340A (2022) https://doi.org/10.1117/12.2633654

KEYWORDS: Staring arrays, Indium, Thermography, Thermal modeling, Superlattices, Sensors, Reliability, Mercury cadmium telluride, Infrared radiation, Finite element methods

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Proceedings Article | 13 May 2019 Paper

High energy neutron irradiation effects on molecular beam epitaxy HgCdTe-based focal plane arrays and cameras

Y. Chang, S. Velicu

Proceedings Volume 10980, 109800V (2019) https://doi.org/10.1117/12.2521311

KEYWORDS: Staring arrays, Mid-IR, Mercury cadmium telluride, Infrared cameras, Cameras, Readout integrated circuits, Long wavelength infrared, Sensors, Infrared imaging, Infrared ROIC, Directed infrared countermeasures, Infrared detectors, Far infrared, Infrared photodetector characterization techniques

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Proceedings Article | 5 March 2013 Paper

Hyperspectral Fabry-Perot filters for HgCdTe infrared detectors

Yong Chang, Christoph Grein, Silviu Velicu, Michael Morley, Neelam Gupta

Proceedings Volume 8613, 861316 (2013) https://doi.org/10.1117/12.2007508

KEYWORDS: Electronic filtering, Long wavelength infrared, Reflectivity, Spectral resolution, Mercury cadmium telluride, Interfaces, Optical filters, Sensors, Infrared detectors, Zinc

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Proceedings Article | 24 October 2012 Paper

Reduced leakage currents of CdZnTe radiation detectors with HgTe/HgCdTe superlattice contacts

Y. Chang, C. Grein, C. Becker, J. Huang, S. Ghosh, F. Aqariden, S. Sivananthan

Proceedings Volume 8507, 850715 (2012) https://doi.org/10.1117/12.949354

KEYWORDS: Stereolithography, Sensors, Mercury cadmium telluride, Superlattices, Metals, Mercury, Semiconductors, Diodes, Sensor performance, Tellurium

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Proceedings Article | 27 August 2010 Paper

Reduction of leakage currents in CdZnTe-based x-ray and gamma-ray detectors: a II-VI semiconductor superlattice approach

Y. Chang, C. Grein, C. Becker, X. Wang, S. Sivananthan

Proceedings Volume 7805, 78050A (2010) https://doi.org/10.1117/12.862285

KEYWORDS: Stereolithography, Sensors, Mercury cadmium telluride, Semiconductors, Electrons, Superlattices, Sensor performance, X-rays, Heterojunctions, Metals

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Proceedings Article | 28 August 2009 Paper

On the optical dispersive properties of HgCdTe as a function of depth

Yong Chang, Vaidya Nathan, Paul LeVan, C. Grein, C Becker, S. Sivananthan

Proceedings Volume 7419, 74190G (2009) https://doi.org/10.1117/12.828432

KEYWORDS: Absorption, Mercury cadmium telluride, Sensors, Data modeling, Dispersion, Infrared radiation, Thermography, Mid-IR, Long wavelength infrared, Infrared detectors

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Proceedings Article | 22 October 2004 Paper

MWIR detectors on HgCdTe grown by MBE on 3-in. diameter silicon substrates

Tae-Seok Lee, Jun Zhao, Yong Chang, Renganathan Ashokan, Sivalingam Sivananthan, Paul Boieriu, Yuanping Chen, Gregory Brill, Priyalal Wijewarnasuriya, Nibir Dhar

Proceedings Volume 5564, (2004) https://doi.org/10.1117/12.568012

KEYWORDS: Mercury cadmium telluride, Mid-IR, Annealing, Arsenic, Heterojunctions, Silicon, Interfaces, Mercury, Sensors, Diffusion

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Proceedings Article | 8 December 2003 Paper

HgCdTe for far-infrared heterodyne detection

Yong Zhou, Jun Zhao, Rita Boreiko, Yong Chang, Yusuf Selamet, Renganathan Ashokan, Charles Becker, Albert Betz, Sivalingam Sivananthan

Proceedings Volume 5209, (2003) https://doi.org/10.1117/12.507564

KEYWORDS: Sensors, Stereolithography, Heterodyning, Superlattices, Mercury cadmium telluride, Tellurium, Electrodes, Cadmium, Absorption, X-ray diffraction

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Proceedings Article | 5 December 2002 Paper

Progress in far-infrared detection technology

Yongdong Zhou, Charles Becker, Renganathan Ashokan, Yusuf Selamet, Yong Chang, Rita Boreiko, Albert Betz, Sivalingam Sivananthan

Proceedings Volume 4795, (2002) https://doi.org/10.1117/12.452270

KEYWORDS: Stereolithography, Superlattices, Mercury cadmium telluride, Absorption, Sensors, Tellurium, Cadmium, X-ray diffraction, Transmission electron microscopy, Mercury

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Proceedings Article | 29 November 2000 Paper

Fabrication of multielement arrays based on high-Tc superconducting microbolometers

Xintian Liu, Z. Liu, Yong Chang, Junhao Chu

Proceedings Volume 4086, (2000) https://doi.org/10.1117/12.408315

KEYWORDS: Superconductors, Microbolometers, Sensors, Infrared radiation, Technetium, Resistance, Electrodes, Physics, Micromachining, Imaging spectroscopy

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Proceedings Article | 29 November 2000 Paper

Infrared photoluminescence characterization of HgCdTe film

Yong Chang, Junhao Chu, Rongbin Ji, X. Wang, Gensheng Huang, J. Li, Li He, Dingyuan Tang

Proceedings Volume 4086, (2000) https://doi.org/10.1117/12.408425

KEYWORDS: Luminescence, Mercury cadmium telluride, Crystals, Silver, Infrared radiation, Arsenic, Temperature metrology, Cadmium, Doping, Excitons

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Proceedings Article | 29 November 2000 Paper

Optical investigations on pseudomorphic delta-doped AlGaAs/InGaAs/GaAs quantum wells

X. Wang, Yong Chang, Xin Cao, Yongsheng Gui, Junhao Chu

Proceedings Volume 4086, (2000) https://doi.org/10.1117/12.408458

KEYWORDS: Quantum wells, Silicon, Luminescence, Indium gallium arsenide, Doping, Gallium arsenide, Physics, Transistors, Temperature metrology, Modulation

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Proceedings Article | 1 April 1999 Paper

Optical storage mechanisms of electron trapping materials

Hao Ruan, Fuxi Gan, Yong Chang

Proceedings Volume 3622, (1999) https://doi.org/10.1117/12.344492

KEYWORDS: Samarium, Ions, Europium, Strontium, Calcium, Cerium, Optical storage, Ultraviolet radiation, Visible radiation, Light

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Showing 5 of 16 publications

SPIE Conference Volume | 29 November 2000

Fourth International Conference on Thin Film Physics and Applications

Conference Committee Involvement (1)

Fourth International Conference on Thin Films Physics and Applications

8 May 2000 | Shanghai, China

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