Patent ID: 7335588
Filing Date: 2008-02-26
Classification: H01L

Abstract:
1. A method, comprising: providing a substrate having a dielectric layer; forming a hard mask layer on a top surface of said dielectric layer; forming an opening in said hard mask layer; forming a trench in said dielectric layer where said dielectric layer is not protected by said hard mask layer said trench having sidewalls and a bottom; recessing said sidewalls of said trench under said hard mask layer; forming a conformal electrically conductive liner on all exposed surface of said trench and said hard mask layer; forming a dielectric liner on said electrically conductive liner where said electrically conductive liner is in contact with said sidewalls of said trench; filling said trench with a core electrical conductor; removing portions of said electrically conductive liner extending above said top surface of said dielectric layer and removing said mask layer; forming an electrically conductive cap on a top surface of said core electrical conductor; before said filling said trench with said core electrical conductor, forming a dielectric liner on exposed surfaces of said electrically conductive liner; and removing said dielectric liner from surfaces of said electrically conductive liner where said electrically conductive liner is in contact with said bottom surface of said trench.