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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