Patent ID: 6663787
Filing Date: 2003-12-16
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising the steps of:forming a first metallization level including a first metal feature; forming a first diffusion barrier layer, comprising a first material, over the first metallization level; forming a first etch stop layer, comprising a second material, over the first diffusion barrier layer; forming a dielectric layer over the first etch stop layer; etching to form an opening having side surfaces through the dielectric layer and the first etch stop layer and exposing the first diffusion barrier layer; sputter etching the first diffusion barrier layer to expose the first metal feature, to round corners of the opening, and to deposit a sidewall diffusion barrier layer comprising the sputter etched first material on the side surfaces of the opening; and filling the opening with metal to form a second metal feature, wherein the first material is different from the second material.