Patent ID: 6756672
Filing Date: 2004-06-29
Classification: H01L

Abstract:
A semiconductor device, comprising:a first metallization level, said first metallization level including a first metal feature; a first diffusion barrier layer, comprising a first material, disposed directly on and contacting said first metallization level; a first etch stop layer, comprising silicon carbide, disposed directly on and contacting said first diffusion barrier layer; a dielectric layer disposed over said first etch stop layer; an opening having side surfaces extending through said dielectric layer, said first etch stop layer, and said first diffusion barrier layer to said first metal feature; a sidewall diffusion barrier layer disposed on said side surfaces; a second diffusion barrier layer disposed on and contacting said sidewall diffusion barrier layer with an interface therebetween and on said first metal feature; and metal within said opening forming a second metal feature, wherein said first material is different from silicon carbide and the opening extends through the sidewall diffusion barrier layer, wherein said sidewall diffusion barrier layer is formed from the same material as said first diffusion barrier layer.