Patent ID: 6391770
Filing Date: 2002-05-21
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising:forming an electrode pad on a front surface of a semiconductor substrate; forming a cylindrical opening extending from a back surface of the semiconductor substrate to the electrode pad by anisotropic dry etching; depositing an Au film covering the back surface and on an inner wall and bottom of the cylindrical opening, as a via hole; non-electrolytically plating an Ni alloy film covering the Au film at the back surface of the substrate and in the via hole; forming a mask covering a region of the Ni alloy film adjacent the via hole and filling the via hole; etching the Ni alloy film using the mask as an etching mask so that the Ni alloy film selectively remains at the region opposite the back surface of the semiconductor substrate and adjacent the via hole; and removing the mask.