Patent ID: 7638264
Filing Date: 2009-12-29
Classification: G03F,Y10S

Abstract:
1. A method of making a patterned structure on a substrate, the method comprising: depositing a positive photoresist composition on the substrate to form a positive photoresist layer, the positive photoresist composition comprising a radiation-sensitive acid generator and a polymer, the polymer comprising: i) a first repeating unit derived from a fluorosulfonamide monomer including one of the following structures, in which M comprises a polymerizable backbone moiety, Z comprises a linking moiety comprising one of —C(O)O—, —C(O)—, —OC(O)—, —O—C(O)—C(O)—O—, R 1 represents one of an alkylene, cycloalkylene, an arylene, a semi- or perfluorinated alkylene, a semi- or perfluorinated cycloalkylene, and a semi- or perfluorinated arylene, p and q is 0 or 1, R 2 represents one of hydrogen, fluorine, an alkyl group of 1 to 6 carbons, and a semi- or perfluorinated alkyl group of 1 to 6 carbons, n is an integer from 1 to 6, and R 3 represents one of hydrogen, an alkyl, an aryl, a semi- or perfluorinated alkyl, and a semi- or perfluorinated aryl; and ii) a second repeating unit including a pendant acid-labile moiety, and iii) a repeating unit including a lactone moiety; and said polymer contains about 15-30 mole % of said repeating unit i), about 30-50 mole % of said repeating unit ii), and about 35-45 mole % of said repeating unit iii); exposing the positive photoresist layer to a pattern of imaging irradiation; removing a portion of the positive photoresist layer that is exposed to the pattern of imaging radiation to reveal a pattern of spaces over the substrate, which pattern corresponds to the pattern of imaging irradiation; and subsequently transferring the pattern to the substrate.