Patent ID: 8148822

Claim:
A metallization structure of a semiconductor device comprising a transistor, comprising: a copper contact pad having a contact point at a bottom of an opening in an insulating layer of said semiconductor device, wherein said insulating layer comprises a nitride layer; a metal layer under said copper contact pad and at a sidewall of said copper contact pad; an aluminum-containing layer over said copper contact pad and vertically over said contact point; a first titanium-containing layer between said aluminum-containing layer and said copper contact pad and vertically over said contact point; a second titanium-containing layer on said aluminum-containing layer and vertically over said contact point; and a gold layer on said second titanium-containing layer and vertically over said contact point, wherein said gold layer has a top surface having no dielectric layer provided thereon and is configured for a chip-on-film (COF) bonding application.