Patent ID: 9005883
Filing Date: 2015-04-14
Classification: G03F

Abstract:
1. A patterning process comprising the steps of: (1) forming a photoresist film on a substrate to be processed by using a positive chemically amplifying type photoresist film composition which contains an acid generator, followed by subjecting the photoresist film to photo-exposure and then to negative development by using an organic solvent while generating an acid from the acid generator in the photoresist film, thereby forming a negatively developed pattern that contains an acid generated from the acid generator, (2) forming a silicon-containing film on the substrate to be processed having thereon the negatively developed pattern by applying a silicon-containing film composition comprising (i) a silicon-containing compound capable of becoming insoluble in a solvent by an acid contained in the negatively developed pattern or both of the acid and heat and (ii) a solvent not dissolving the negatively developed pattern, (3) insolubilizing in a solvent the silicon-containing film in a vicinity of a surface of the negatively developed pattern by an acid contained in the negatively developed pattern as a catalyst or by both of the acid and heating, (4) removing the non-insolubilized part of the silicon-containing film by dissolving it with an organic solvent thereby obtaining an insolubilized part as a silicon-containing film pattern, (5) dry-etching or wet-etching the upper part of the silicon-containing film pattern thereby exposing the upper part of the negatively developed pattern, (6) removing the negatively developed pattern by dry etching or wet etching, and (7) transferring the pattern to the substrate to be processed by using, as an etching mask, the silicon-containing film pattern whose upper part is dry-etched or wet-etched.