Patent ID: 8906757
Filing Date: 2014-12-09
Classification: H01L

Abstract:
1. A method of forming patterns of a semiconductor device, the method comprising: forming a hard mask film on a semiconductor substrate; forming first and second sacrificial film patterns that are spaced apart from each other on the hard mask film; forming a first spacer on opposing sidewalls of the first sacrificial film pattern and a second spacer on opposing sidewalls of the second sacrificial film pattern; removing the first and second sacrificial film patterns; trimming the second spacer such that a line width of the second spacer becomes smaller than a line width of the first spacer; forming a buffer film on the hard mask film after forming the hard mask film and before forming the first and second sacrificial film patterns; forming first and second buffer film patterns by etching the buffer film using the first and second spacers as an etch mask after removing the first and second sacrificial film patterns and before trimming the second spacer, wherein trimming the second spacer comprises trimming the second spacer and the second buffer film pattern such that a line width of the second buffer film pattern becomes smaller than a line width of the first buffer film pattern; and forming first and second hard mask film patterns by etching the hard mask film using the first spacer and the trimmed second spacer as an etch mask.