Patent ID: 7871909
Filing Date: 2011-01-18
Classification: H01L,Y10S

Abstract:
1. A method of forming features, the method comprising: forming a first pattern having first features in a first material and a second material that resides under the first material, the first material having an etch selectivity with respect to the second material, the first features in the second material having exposed sidewalls; forming sidewall spacers from a third material adjacent to the exposed sidewalls of the first features in the second material, the third material having an etch selectivity with respect to both the first material and the second material; reducing the width of the first features in the first pattern in the first material; reducing the width of the first features in the first pattern in the second material using remaining portions of the first material as a mask; and forming a second pattern having second features based on remaining portions of the second material and the sidewall spacers.