Patent ID: 8115317

Claim:
A semiconductor device comprising: a semiconductor substrate having a first face and a second face opposite to the first face; a semiconductor element formed on the first face side; at least one electrode formed on the first face side, the at least one electrode being electrically connected to the semiconductor element; a first insulation film that covers the semiconductor element and the at least one electrode; a first opening having a first diameter, the first opening having a first depth from the second face of the semiconductor substrate sufficient to reach the first insulation film; a second insulation film coated on an inner side face of the first opening and the second face; a second opening having a second diameter and being defined by an inner side face of the second insulation film coated on the inner side face of the first opening, the second opening having second depth from the second face of the semiconductor substrate and passing through the first insulation film to expose the at least one electrode, wherein the second depth is greater than the first depth; and a conductor layer formed on the second insulation film, and on an inner side face and an inner bottom of the second opening, the conductor layer being electrically connected to the at least one electrode.