Patent ID: 6902874

Claim:
A method of forming a patterned material structure on a substrate, said material being selected from the group consisting of semiconductors, ceramics and metals, said method comprising: (A) providing a substrate with a layer of said material, (B) applying a resist composition to said substrate to form a resist layer on said substrate, said resist composition comprising (a) an imaging polymer, and (b) a radiation sensitive acid generator, said imaging polymer comprising cyano-modified acrylic monomer units comprising an acrylic moiety with a cyano group pendant therefrom; (C) patternwise exposing said substrate to radiation whereby acid is generated by said acid generator in exposed regions of said resist layer by said radiation, (D) contacting said substrate with an aqueous alkaline developer solution, whereby said exposed regions of said resist layer are selectively dissolved by said developer solution to reveal a patterned resist structure, and (E) transferring resist structure pattern to said material layer, by etching into said material layer through spaces in said resist structure pattern.