Patent ID: 8518628

Claim:
A resist material for use in lithography, comprising: a resist polymer configured to turn soluble to a base solution in response to reaction with an acid; a photo acid generator configured to release the acid in response to an exposure process; and a switchable polymer having a structure that causes it to separate from the resist polymer and diffuse towards a surface of the resist material in response to a bake process, and that causes the surface of the resist material to become more hydrophilic in one of a developer solution and an immersion fluid; wherein the switchable polymer includes a base soluble polymer configured to turn soluble to water in response to a reaction with a base developer solution, wherein the base soluble polymer has a dissolution rate that facilitates rapid removal of defects, and wherein the base soluble polymer includes one of: or R1, R2, and R3 are H and R4 is a fluorinated alkyl group of 1 to 20 carbon atoms; R5, R6, and R7 are H and R8 is a straight chain fluorinated alkyl group of 1 to 20 carbon atoms; R9 and R10 are H, R11 is H or a straight, branched, or cyclic alkyl group of 1 to 20 carbons, and R12 and R13 are a straight, branched, or cyclic alkyl or fluorinated alkyl group of 1 to 20 carbons; and R14 and R15 are H, and R16 is H or a straight, branched, or cyclic alkyl group of 1 to 20 carbons, and R17 and R18 are a straight, branched, or cyclic alkyl or fluorinated alkyl group of 1 to 20 carbons.