Patent ID: 8389404

Claim:
A method for manufacturing a semiconductor device, the method comprising: providing a first substrate and a second substrate, the first substrate and the second substrate being bonded to each other and having a posterior interconnect layer interposed between them, and a weld pad disposed in the posterior interconnect layer; forming a first annular opening in the first substrate to expose a portion of the weld pad; forming a dielectric layer in the first annular opening; removing a portion of the first substrate that is surrounded by the first annular opening by a wet etching process and using the dielectric layer as a mask to form a via that exposes at least a portion of the weld pad; forming an interconnect layer in the via, the interconnect layer being electrically connected with the weld pad; and forming a conductive bump on the interconnect layer, wherein the conductive bump is electrically connected with the interconnect layer.