Patent ID: 9581909
Date: 2017-02-28
CPC Classifications: G03F,H01L

Claim:
1. A method of trimming a resist pattern, comprising: a step A in which a positive resist film is formed on a substrate, the positive resist film is exposed and the positive resist film is subjected to an alkali development to form a first resist pattern having an alkali-insoluble region on the surface thereof; a step B in which a resist trimming composition including an acid component is applied to the substrate whereon the first resist pattern is formed; a step B1 in which the resist trimming composition present at an upper portion of the first resist pattern is removed; a step C in which the first resist pattern coated with the resist trimming composition is heated and the solubility of the first resist pattern in a developing solution is changed under action of acid derived from the acid component included in the resist trimming composition; and a step D in which the first resist pattern after heating is developed with an organic solvent to remove the alkali-insoluble region of the first resist pattern, wherein the resist trimming composition comprises the acid component and a solvent which does not dissolve the first resist pattern.