Patent ID: 7592253
Filing Date: 2009-09-22
Classification: H01L

Abstract:
1. A method of forming a damascene pattern including a via and a trench in a damascene process of forming a copper metal interconnection, comprising: forming an interlayer dielectric layer on a substrate; forming a first photosensitive layer pattern including a first opening that exposes a region in which a via is to be formed on the interlayer dielectric layer; etching the interlayer dielectric layer to a first depth using the first photosensitive layer pattern as an etching mask; removing the first photosensitive layer pattern and forming a second photosensitive layer pattern including a second opening that exposes a region in which a trench is to be formed on the interlayer dielectric layer; forming plasma reaction by-product layers on sidewalls of the second photosensitive pattern in the second opening; and etching the interlayer dielectric layer using the second photosensitive layer pattern and the plasma reaction by-product layers as an etching mask to simultaneously form the via and the trench.