Patent ID: 7223654

Claim:
A method of forming a structure, comprising: providing a semiconductor substrate; forming a dielectric layer on a top surface of said semiconductor substrate, said dielectric layer having a top surface and a bottom surface; forming a trench in said dielectric layer, said trench extending from said top surface to said bottom surface of said dielectric layer; forming a conformal conductive liner on all sidewalls and extending along a bottom of said trench; filling said trench with a first core conductor; removing an upper portion of said first core conductor from said trench, an entire top surface of remaining first core conductor recessed below said top surface of said dielectric layer; forming an insulating layer on a top surface of said conformal conductive liner on regions of said conformal conductive liner not covered by said remaining first core conductor and a top surface of said remaining first core conductor; and completely filling spaces in said trench not filled by said conformal conductive liner, said remaining first core conductor and said insulating layer with a single layer of a second core conductor, said second core conductor in direct physical contact with said insulating layer.