Patent ID: 7834457
Filing Date: 2010-11-16
Classification: H01L

Abstract:
1. A semiconductor structure comprising: a first interconnect level including a first dielectric material having at least one conductive feature embedded therein, said at least one conductive feature has an upper surface in which at least some portions thereof are protected by an overlying first metallic capping layer, wherein said upper surface of said at least one conductive feature is coplanar with an upper surface of said first dielectric material and wherein said first metallic capping layer has an upper surface that is located above said upper surface of the first dielectric material; a dielectric capping layer located on said upper surface of said first dielectric material and said upper surface of said first metallic capping layer; a second interconnect level including a second dielectric material having at least one conductively filled opening punched through said dielectric capping layer and located on said upper surface of said first metallic capping layer; and a second metallic capping layer located only at a bottom portion of said at least one conductively filled opening and on at least some portion of the upper surface of said first metallic capping layer, said second metallic capping layer is comprised of a different metal than said first metallic capping layer.