Patent ID: 7704876
Filing Date: 2010-04-27
Classification: H01L

Abstract:
1. A method for forming an interconnect structure on a substrate, the substrate comprising a first layer of a first dielectric material having at least one first conductor embedded therein, the first conductor having a top surface coplanar with a top surface of the first layer of the first dielectric material, the method comprising the steps of: depositing a second layer of a second dielectric material on the first layer of the first dielectric material; forming at least one first opening in the second layer of the second dielectric material; forming at least one second opening in the second layer of the second dielectric material, the second opening overlying the first opening, and the second opening having a lateral extent greater than that of the first opening; depositing a first conductive liner on bottoms and sidewalls of said first and second openings followed first by filling at least the first opening and the second opening with a first conductive material and second by removing the first conductive material and the first conductive liner from the bottoms and the sidewalls of the second opening; and filling the second opening with a second conductive material, thereby forming a second conductor, wherein the second conductor has a top surface being made coplanar with the top surface of the second layer of the second dielectric material.