Patent ID: 8361905
Filing Date: 2013-01-29
Classification: H01L

Abstract:
1. A method of forming patterns of a semiconductor device, the method comprising: forming a dual mask layer on a substrate having a first region and a second region; forming a variable mask layer on the dual mask layer in the first region and the second region; forming a first photoresist pattern and a second photoresist pattern on the variable mask layer, wherein the first photoresist pattern has a first thickness and a first width in the first region, and the second photoresist pattern has a second thickness greater than the first thickness and a second width wider than the first width in the second region; forming a first mask pattern and a first variable mask pattern in the first region, and a second mask pattern and a second variable mask pattern in the second region, by sequentially etching the variable mask layer and the dual mask layer by using, as etch masks, the first photoresist pattern and the second photoresist pattern, wherein the first mask pattern comprises a first portion of the dual mask layer, and the first variable mask pattern is a first remaining portion of the variable mask layer and has a first thickness, and wherein the second mask pattern comprises a second portion of the dual mask layer, and the second variable mask pattern is a second remaining portion of the variable mask layer and has a second thickness that is greater than the first thickness of the first variable mask pattern; simultaneously forming first spacers covering side walls of the first mask pattern and second spacers covering side walls of the second mask pattern; removing the first mask pattern; and simultaneously etching the substrate in the first region and the second region by using the first spacers as an etch mask in the first region, and the second mask pattern and the second spacers as an etch mask in the second region.