Patent ID: 9673089
Date: 2017-06-06
CPC Classifications: H01L

Claim:
1. A method for forming an interconnect structure comprising: providing a dielectric layer having a conductive feature embedded therein, the conductive feature having a first top surface that is substantially coplanar with a second top surface of the dielectric layer; forming a metal cap layer located directly on the first top surface, wherein a total width of first top surface corresponds to a total width of the metal cap layer; forming a first dielectric cap layer located directly on the second top surface, wherein a total width of the first dielectric cap layer corresponds to a total width of the second top surface and the first dielectric cap layer is thicker than the metal cap layer; and forming a second dielectric cap layer directly on the metal cap layer and directly on the first dielectric cap layer, wherein the metal cap layer consists of: i) a metal or ii) a combination of metals and wherein the metal cap layer has a substantially uniform composition profile.