Patent ID: 8237285
Filing Date: 2012-08-07
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate having a first surface and a second surface opposite to the first surface; a through hole provided in the semiconductor substrate, the through hole having a first opening on the first surface and a second opening on the second surface, and including an expansion portion which is provided in a vicinity of the first surface so that an opening area of the first opening is greater than an opening area of a lowermost portion of the expansion portion; a first insulating layer provided on the first surface of the semiconductor substrate, and having an opening which communicates with the through hole and has an area smaller than the opening area of the first opening; a first wiring layer provided on the first insulating layer to close the opening of the first insulating layer; a second insulating layer provided on the expansion portion of the through hole, and to cover the first opening and an inner wall surface of the through hole, the second insulating layer having an opening communicating with the opening of the first insulating layer so as to expose the first wiring layer through the opening of the first insulating layer; and a second wiring layer provided on the second insulating layer to extend from inside of the through hole to the second surface of the semiconductor substrate, the second wiring layer being connected to the first wiring layer via the openings of the first and second insulating layers.