Patent ID: 8211615
Filing Date: 2012-07-03
Classification: C08F,G03F,Y10S

Abstract:
1. A copolymer for immersion lithography, comprising: a repeating unit (A) that generates an alkali-soluble group by removing a protecting group through action of an acid, a repeating unit (B) having a lactone structure, and a repeating unit (C) that generates an alcoholic hydroxyl group by removing a protecting group through action of an acid, wherein, when a solution of the copolymer in propylene glycol monomethyl ether acetate is applied to a wafer and then heated to form a thin film, and a 15-μL droplet of pure water is added onto the thin film, the inclination of the wafer at the time when the water droplet starts to move is 35° or less, wherein the repeating unit (C) has a structure represented by formula (C2): wherein R wherein R