Patent ID: 7476606

Claim:
A method of forming a carrier on a semiconductor wafer having a plurality of separate semiconductor devices, a substantially planar back side and a thickness less than or equal to 10 mils, said method comprised of: a) applying a first photoresist layer to the back side; b) depositing a first contact layer on said back side that is comprised of: an adhesive titanium layer, followed by an intermediate layer of platinum over the titanium layer, followed by a layer of gold over the platinum layer, the layers of titanium, platinum and gold being deposited onto the back side of the substrate; c) removing the first photoresist layer to form one or more trench lines; d) depositing an interconducting layer of aluminum grown on the gold layer of the first contact layer and within the one or more trench lines; e) applying a second photoresist layer to the layer of aluminum over the one or more trench lines; f) locally removing the aluminum layer from the gold layer between the second photoresist layer; g) depositing a binding layer of nickel over the gold layer between the second photoresist layer; h) depositing a carrier metal layer of copper on the nickel layer between the second photoresist layer; i) depositing a solder layer on the copper layer between the second photoresist layer; and j) removing the second photoresist layer.