Patent ID: 8796856
Filing Date: 2014-08-05
Classification: H01L

Abstract:
1. A semiconductor device comprising: an SOI substrate having a semiconductor substrate layer, a semiconductor layer, and a first insulation film, said semiconductor layer having a semiconductor element and a first electrode pad formed on a surface of the semiconductor layer, and said first insulation film being disposed between the semiconductor substrate layer and the semiconductor layer, the semiconductor substrate layer having a first surface and a second surface opposite the first surface, the first surface being in contact with the first insulation film, the second surface defining an outer surface of the SOI substrate, and the surface of the semiconductor layer defining an opposite outer surface of the SOI substrate; a first through via extending through the SOI substrate from the second surface of the semiconductor substrate layer and terminating at the surface of the semiconductor layer, the first electrode pad being on top of one end of the first through via and being electrically connected to the first through via; an external terminal provided on the second surface of the semiconductor substrate layer, the external terminal being electrically connected to another end of the first through via, with a second insulation film being disposed between the external terminal and the semiconductor substrate layer; a contact part having a conductive film electrically connected to the semiconductor substrate layer at a bottom of a trench, said trench extending from the second surface of the semiconductor substrate layer and terminating in the semiconductor substrate layer; a potential fixing electrode provided on the second surface of the semiconductor substrate layer, the potential fixing electrode being electrically connected to the contact part, with the second insulation film being disposed between the potential fixing electrode and the semiconductor substrate layer; a second electrode pad on the surface of the semiconductor layer, said first electrode pad being separate from the second electrode pad; and a second through via extending through the SOI substrate from the second surface of the semiconductor substrate layer, the second through via being electrically connected to the second electrode pad, the second through via being separate from the first through via, the second through via being electrically connected to the potential fixing electrode.