Patent ID: 9054054
Filing Date: 2015-06-09
Classification: H01L

Abstract:
1. A method of forming patterns, comprising: etching a layer on a substrate using a mask to form a plurality of first preliminary patterns that are spaced apart from each other by a first distance and a plurality of second preliminary patterns that are spaced apart from each other by a second distance that is larger than the first distance, wherein the first preliminary patterns have a first width; forming first and second coating layers on sidewalls of the first and second preliminary patterns, respectively, wherein the second coating layer has a width adjacent the substrate that is larger than a width of the first coating layer adjacent the substrate; and etching the first and second coating layers and portions of the first preliminary patterns using the mask to form a plurality of first patterns having vertical sidewalls and a plurality of second patterns having vertical sidewalls, wherein the first patterns have a second width that is less than the first width of the first preliminary patterns.