Patent ID: 9627321
Date: 2017-04-18
CPC Classifications: H01L

Claim:
1. An apparatus, comprising: a substrate comprising silicon; an interlayer dielectric layer over the substrate, the interlayer dielectric layer comprising silicon, oxygen, and carbon, the interlayer dielectric layer having a top boundary; a trench in the interlayer dielectric layer, the trench having internal sidewalls; a barrier layer comprising tantalum and nitrogen on the internal sidewalls of the trench; a conductive material in the trench, the barrier layer between the conductive material and the interlayer dielectric layer; and a capping region comprising cobalt directly on the top of the conductive material comprising copper and cobalt, a top of the capping region near the interlayer dielectric layer being no higher than the top boundary of the interlayer dielectric layer that is near the capping region.