Patent ID: 8778791

Claim:
A method for making a semiconductor structure, comprising: (a) providing a first wafer and a second wafer, wherein the first wafer has a first active surface, at least one first conductive pad, and a first back surface opposite to the first active surface, the first conductive pad is exposed to the first active surface, and has at least one through hole, the second wafer has a second active surface and at least one second conductive pad, the second conductive pad is exposed to the second active surface; (b) disposing the first wafer on the second wafer; (c) removing part of the first wafer, so as to form a groove, wherein the groove communicates with the through hole of the first conductive pad, and exposes the first conductive pad and the second conductive pad; (d) forming a through via in the groove, wherein the through via electrically connects the first conductive pad and the second conductive pad, wherein the through via has opposite upper and lower surfaces, and the lower surface of the through via directly contacts the second conductive pad; and (e) forming at least one electrical connecting element on the first back surface of the first wafer, wherein the upper surface of the through via directly contacts the electrical connecting element.