Patent ID: 7646079
Filing Date: 2010-01-12
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate having a through hole penetrating through the semiconductor substrate in a thickness direction thereof; an active region formed in a first main surface of the semiconductor substrate; a through-hole electrode formed in the through hole, electrically connected to the active region and extending to reach a second main surface of the semiconductor substrate; and a trench formed in the semiconductor substrate, filled with an insulating material and surrounding the active region, the through-hole electrode being formed outside an area of the semiconductor substrate surrounded by the trench, wherein an end of the through-hole electrode projects from the second main surface of the semiconductor substrate, and the through hole has a first portion extending from the second main surface and having a vertical sidewall with respect to the first and second main surfaces and has a second portion extending from the first main surface and having a tapered sidewall so as to have a maximum size at the first main surface of the semiconductor substrate.