Patent ID: 8058728
Filing Date: 2011-11-15
Classification: H01L

Abstract:
1. An interconnect structure, comprising: an interconnect opening formed within a dielectric material; a diffusion barrier in direct contact with the dielectric material, the diffusion barrier comprising a compound from a thermal reaction between cobalt (Co) metal from at least a portion of a cobalt metal layer formed on the dielectric material and a dielectric reactant element from the dielectric material, wherein the compound includes cobalt silicide, cobalt silicate, cobalt silicon oxynitride, cobalt oxide, cobalt nitride, or cobalt carbide, or a combination thereof; a cobalt nitride adhesion layer in the interconnect opening; and a copper (Cu) metal fill in the interconnect opening, wherein the diffusion barrier and the cobalt nitride adhesion layer surround the Cu metal fill within the interconnect opening.