Patent ID: 9324563
Filing Date: 2016-04-26
CPC Classification: G03F,H01L

Claim Text:
1. A method of forming a pattern, comprising: forming an etch-target layer on a substrate; forming a photoresist layer on the etch-target layer; performing a first exposure process to transform first portions of the photoresist layer into first photoresist patterns spaced apart from each other; performing a second exposure process to transform second portions of the photoresist layer into second photoresist patterns spaced apart from each other; removing portions of the photoresist layer not transformed into the first and second photoresist patterns to expose a top surface of the etch-target layer; forming mask patterns in gaps between the first and second photoresist patterns after removing the portions of the photoresist layer; removing the first and second photoresist patterns; and etching the etch-target layer using the mask patterns as an etch mask, wherein each of the second photoresist patterns is disposed between two directly adjacent ones of the first photoresist patterns, and wherein the mask patterns are formed of a material having an etch selectivity with respect to the first and second photoresist patterns.