Patent ID: 7563710
Filing Date: 2009-07-21
Classification: H01L

Abstract:
1. A method, comprising: forming a dielectric layer on a substrate; 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; after forming said trench, recessing said sidewalls of said trench under said hard mask layer, after said recessing said hardmask layer overhanging said sidewalls of said trench; after said recessing, forming a conformal electrically conductive liner on all exposed surfaces of said trench and said hard mask layer, after said forming said conformal liner, regions of said conductive liner overhang said sidewalls of said trench; forming a layer of electrically conductive core conductor on said conductive liner, said layer of core conductor filling said trench; removing said hard mask layer and all regions of said layer of core conductor and said conductive liner extending above said top surface of said dielectric layer, after said removing said hard mask layer, regions of said core conductor extend under regions of said conductive liner; and forming an electrically conductive cap only on a top surface of remaining said core electrical conductor.