Patent ID: 8053894
Filing Date: 2011-11-08
Classification: H01L

Abstract:
1. A semiconductor structure comprising: a substrate; a first layer in at least one non-conductive region on said substrate, the first layer substantially coplanar with a planar upper surface of the non-conductive region, said first layer defining at least one first level conductor formed of a first metal having a first sidewall surface, second sidewall surface, a bottom surface and a top surface and substantially free of a second metal, and a barrier region with sidewalls between the first sidewall surface and the second sidewall surface of the at least one first level conductor and the at least one non-conductive region; a dielectric layer over at least a portion of the at least one first level conductor; an alloy layer located between the top surface of the at least one first level conductor and the dielectric layer and in physical contact with only the top surface of the at least one first level conductor such that the at least one first level conductor and the dielectric layer are not in contact, said alloy layer comprising said second metal and said first metal, having a substantially planar upper surface, and contacting the sidewalls of the barrier region; and a second layer covering the alloy layer, said second layer comprising the second metal substantially free of said first metal.