Patent ID: 7863721

Claim:
A method of making a semiconductor device, comprising: providing a first wafer having a bond pad formed over a front surface of the first wafer; providing a second wafer having a bond pad formed over a front surface of the second wafer; connecting the bond pads of the first and second wafers using a conductive adhesive; forming a first interconnect structure within the second wafer by, forming a first via in a back surface of the second wafer opposite the front surface, the first via exposing the bond pad of the second wafer, and forming a first metal layer conformally over the first via, the first metal layer being in electrical contact with the bond pad of the second wafer; mounting a third wafer over the second wafer by connecting a bond pad formed over a front surface of the third wafer to the first metal layer; and forming a second interconnect structure over a backside of the third wafer opposite the front surface, the second interconnect structure being electrically connected to the first metal layer.