Patent ID: 7803519

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: (a) coating a photoresist composition comprising a photoresist polymer and an organic solvent on an underlying layer of a semiconductor substrate, the photoresist polymer comprising a polymerization-repeating unit represented by Formula 1 and a co-monomer represented by Formula 2: wherein R 1 is H or C 1 -C 2 alkyl; R 2 is C 1 -C 10 perfluoroalkyl or partially F-substituted C 1 -C 10 alkyl; R 3 is an acid labile protecting group; and the relative ratio of a:b:c:d is 10:10˜30:2˜8:2˜8 by weight parts; wherein the R 4 is linear or branched C 1 -C 10 alkylene, and n is an integer ranging from 1 to 2; (b) baking the resultant structure to form a photoresist film; (c) exposing the photoresist film to light; (d) baking the exposed photoresist film; (e) developing the resultant structure of step (iv) to obtain a first photoresist pattern; and (f) etching the underlying layer using the first photoresist pattern as an etching mask to form an underlying layer pattern.