Patent ID: 7608546
Filing Date: 2009-10-27
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor device, the method comprising: forming an etch target layer over a substrate, wherein the substrate includes a cell region and a peripheral region; forming a first hard mask layer, a second hard mask layer, and an anti-reflective coating layer over the etch target layer; forming a photosensitive pattern over the anti-reflective coating layer; etching the anti-reflective coating layer to have a width smaller than a width of the photosensitive pattern; etching the second hard mask layer; performing a main etching treatment and an over-etching treatment on the first hard mask layer to form first hard mask patterns in the cell region, wherein the first hard mask patterns have a sloped profile; and etching the etch target layer using the first hard mask patterns as an etch mask.