Patent ID: 8039345
Filing Date: 2011-10-18
Classification: H01J,H01L

Abstract:
1. A method of forming a semiconductor device, the method comprising: forming a first pattern on a substrate; forming a first dielectric layer on the first pattern, wherein the first pattern is between portions of the first dielectric layer and the substrate; forming a second dielectric layer on the first dielectric layer, wherein the first dielectric layer is between the first pattern and the second dielectric layer; forming a second pattern on the second dielectric layer, wherein portions of the second dielectric layer are exposed by the second pattern and wherein the first and second dielectric layers are between portions of the first and second patterns wherein forming the second pattern comprises, isotropically etching the exposed portions of the second dielectric layer; and after isotropically etching the exposed portions of the second dielectric layer, removing the mask pattern by ashing the photoresist pattern and stripping the hard mask pattern.