Patent ID: 8652966

Claim:
A semiconductor device manufacturing method comprising: forming a seed film including a first metal over a bottom surface and a side wall of an opening portion formed over an insulating film and the insulating film outside of the opening portion; forming a mask film over the seed film and filling the opening portion with the mask film; removing a part of the mask film while leaving the mask film over the seed film formed over the bottom surface of the opening portion and exposing the seed film, which is formed over an upper portion of the side wall of the opening portion and the insulating film except for the opening portion; forming a cover film including a second metal whose resistivity is higher than that of the first metal over the seed film located over the upper portion of the side wall of the opening portion and the insulating film except for the opening portion; exposing the seed film by removing the mask film left over the opening portion after forming the cover film; and forming a plating film including the first metal over the exposed seed film.