Patent ID: 8906781

Claim:
A method for electrically connecting wafers, which electrically connects first and second wafers subjected to a series of processes using a butting contact structure, the method comprising: physically bonding the first and second wafers through an insulator-to-insulator bonding method; and electrically connecting a first conductive region of the first wafer to a second conductive region of the second wafer corresponding to the first conductive region through a metal-to-metal bonding method using through-silicon vias (TSVs) or butting contact holes; wherein the electrically-connecting of the first conductive region of the first wafer to the second conductive region of the second wafer comprises: forming a butting contact hole to reach the second conductive region through the substrate bottom of the first wafer and the first conductive region; filling a conductive material into a part of the butting contact hole corresponding to the first conductive region and a region between the first and second conductive regions; and filling an insulating material into the other part of the butting contact hole in which the conductive material is not filled.