Patent ID: 7968456
Filing Date: 2011-06-28
Classification: H01L

Abstract:
1. A method of making an electronic device comprising the steps of: providing a first diffusion barrier layer; providing a first dielectric layer on said first diffusion barrier layer; providing a hardmask layer on said first dielectric layer; providing an oxide layer on said hardmask layer; forming openings in said oxide, hardmask and first dielectric layers; providing a liner layer; providing a metal layer; removing a portion of said metal layer and said liner layer, wherein a top surface of a remaining portion of said metal layer is coplanar with a top surface of a remaining portion of said liner layer; selectively etching said oxide layer, wherein said top surface of said remaining portion of said metal layer and said top surface of said remaining portion of said liner layer protrude above a top surface of said hardmask layer; forming a second diffusion barrier layer contiguously on said hardmask layer and said metal layer, and providing a second dielectric layer on said second diffusion barrier layer.