Patent ID: 8715919

Claim:
A method for performing lithography on a semiconductor substrate, the method comprising: coating a resist layer on the substrate, wherein the resist layer comprises a resist polymer configured to turn soluble to a base solution in response to reaction with an acid, and a switchable polymer that includes one of: wherein 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; performing a pre-exposure bake on the resist layer; exposing the resist-coated substrate; and developing the exposed substrate with a developing solution.