Patent ID: 7745927

Claim:
An integrated circuit die comprising: a substrate having a front surface and a back surface; a plurality of electrical circuits formed on the substrate front surface; and a plurality of metal layers formed on the substrate back surface; wherein the plurality of metal layers comprises: a first layer comprising titanium having a thickness of about 150 to about 400 Angstroms formed on the substrate back surface; a second layer comprising chromium having a thickness of about 400 to about 1,500 Angstroms formed on the first layer; a third layer comprising gold having a thickness of about 2,000 to about 4,000 Angstroms formed on the second layer; a fourth layer comprising copper having a thickness of about 100 to about 200 micrometers formed on the third layer; and a fifth layer comprising nickel having a thickness of about 500 to about 2,500 Angstroms formed on the fourth layer wherein the plurality of metal layers is further configured to increase the heat dissipation from the substrate by more than about 25% when compared to a substrate without metal layers formed on the back surface.