Patent ID: 9601431
Date: 2017-03-21
CPC Classifications: H01L

Claim:
1. A method for forming an interconnect structure, the method comprising: positioning a substrate in a vacuum processing chamber, wherein the substrate comprises a copper layer having an exposed surface and a low-k dielectric layer having an exposed surface; forming a metal layer over the exposed copper surface but not over the exposed dielectric surface, wherein the metal layer comprises cobalt, cobalt tungsten phosphide, cobalt tungsten nitride, or cobalt tungsten phosphonitride, wherein the metal layer has a thickness of about 17 Å to about 50 Å, and wherein the metal-based dielectric layer is formed by physical vapor deposition; forming a metal-based dielectric layer over the exposed dielectric surface and the metal layer, wherein: forming a second low-k dielectric layer directly over the metal-based dielectric layer; forming a trench in the second low-k dielectric layer; and filling the trench at least partially with copper.