Patent ID: 6916594

Claim:
A method for forming a photoresist pattern comprising: (a) coating a chemically amplified photoresist composition on a semiconductor substrate and baking the substrate to form a photoresist film; (b) exposing the photoresist film to light; (c) baking the photoresist film; (d) developing the photoresist film to form a photoresist pattern; (e) coating an overcoating composition on the entire photoresist pattern to form an overcoating layer; (f) baking the overcoating layer; and (g) developing the overcoating layer with an alkaline developing solution; wherein the overcoating composition comprises: (i) a water-soluble polymer being one of a compound of Formula 1 or polyvinylpyrrolidone: wherein R′ is H or CH 3 ; R 5 and R 6 individually are H or a C 1 -C 3 alkyl group; and n is an integer from 50 to 150; (ii) an acidic compound; and (iii) water.