Patent ID: 8552559

Claim:
An integrated circuit chip comprising: a semiconductor substrate; multiple transistors in and on said semiconductor substrate; an insulating layer over said semiconductor substrate; a first metallization structure over said insulating layer, wherein said first metallization structure comprises a first metal layer and a second metal layer over said first metal layer, wherein said first metallization structure comprises a metal line comprising a copper portion, and said first metallization structure further comprises a first adhesion layer under said copper portion and at sidewalls of said metal line, wherein said metal line has a thickness less than 2 micrometers; a dielectric layer between said first and second metal layers; a first insulating nitride layer over said first metallization structure and over said dielectric layer; a second metallization structure on and in physical contact with a top surface of said first insulating nitride layer, wherein said second metallization structure comprises a second adhesion layer on said first insulating nitride layer, and an electroplated copper layer over said second adhesion layer, wherein said second adhesion layer physically contacts said top surface of said first insulating nitride layer, wherein said second adhesion layer is under said electroplated copper layer, but is not at sidewalls of said electroplated copper layer, wherein said electroplated copper layer has a thickness greater than 3 micrometers; a separating layer on said second metallization structure and on and in physical contact with said top surface of said first insulating nitride layer, wherein said separating layer physically contacts a top surface of said electroplated copper layer and said sidewalls of said electroplated copper layer, wherein said separating layer comprises a second insulating nitride layer over said top surface of said electroplated copper layer and over said top surface of said first insulating nitride layer; and a polymer layer on said separating layer, wherein an opening through said polymer layer and said separating layer is over a contact point of said top surface of said electroplated copper layer, and said contact point is at a bottom of said opening.