Patent ID: 8659156
Filing Date: 2014-02-25
Classification: H01L

Abstract:
1. An interconnect structure comprising: a first interconnect dielectric material having at least one conductive feature located therein; a dielectric capping layer located atop the first interconnect dielectric material and a portion of the at least one conductive feature; a second interconnect dielectric material located on said dielectric capping layer and having at least one via opening that is in contact with an exposed portion of the at least one conductive feature; an electromigration and stress migration enhancement liner is a metal and located within the at least one via opening, wherein a first portion of said electromigration and stress migration enhancement liner has a first thickness and is located on exposed sidewalls of said second interconnect dielectric material and a second portion of said electromigration and stress migration enhancement liner has a second thickness and is located on an upper surface of said exposed portion of the at least one conductive feature, and wherein said second thickness is at least 3 times greater than said first thickness and said first portion and said second portion of said electromigration and stress migration enhancement liner are of unitary construction; a diffusion barrier located on the electromigration and stress migration enhancement liner and within said at least one via opening; an adhesion liner located on the diffusion barrier and within said at least one via opening; and a conductive region located on the adhesion liner and within said at least one via opening.