Patent ID: 8975010
Filing Date: 2015-03-10
Classification: G03F

Abstract:
1. A method of forming a resist pattern comprising: a step (1) in which a first resist composition comprising a base component (A) that exhibits increased solubility in an alkali developing solution under action of acid, an acidic compound component (G) and a photobase generator component (C) that generates a base upon exposure is applied to a substrate to form a first resist film; a step (2) in which the first resist film is subjected to exposure; a step (3) in which baking is conducted after the step (2), such that, at an exposed portion of the first resist film, the base generated from the photobase generator component (C) upon the exposure and the acidic compound component (G) are neutralized, and at an unexposed portion of the first resist film, the solubility of the base component (A) in an alkali developing solution is increased by the action of the acidic compound component (G); a step (4) in which the first resist film is subjected to an alkali development, thereby forming a negative-tone resist pattern in which the unexposed portion of the first resist film has been dissolved and removed; a step (5) in which a second resist composition comprising a second base component (A) that exhibits increased solubility in an alkali developing solution, an acid generator component (B′) that generates acid upon exposure and an organic solvent (S′) that does not dissolve the negative-tone resist pattern is applied to the substrate having the negative-tone resist pattern formed thereon to form a second resist film; a step (6) in which the second resist film is subjected to exposure; and a step (7) in which the second resist film is subjected to an alkali development, thereby forming a resist pattern.