Patent ID: 7880293

Claim:
A method of making a semiconductor device, comprising: providing a wafer for supporting the semiconductor device; forming a conductive layer over a top surface of the wafer; permanently bonding a carrier wafer over the conductive layer; forming an interconnect structure within the wafer and the carrier wafer by, forming a first via in the wafer exposing the conductive layer, forming a second via in the carrier wafer exposing the conductive layer, depositing a first metal layer over the first via, the first metal layer in electrical contact with the conductive layer, and depositing a second metal layer over the second via, the second metal layer in electrical contact with the conductive layer; depositing first and second passivation layers over the first and second metal layers; and etching a portion of the first or second passivation layer to expose a portion of the first metal layer or second metal layer.