Patent ID: 7211870
Filing Date: 2007-05-01
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of one-conductivity-type; and a plurality of transistor formation regions provided at said semiconductor substrate, wherein each of said plurality of transistor formation regions includes: a first region of the one-conductivity-type formed at an element formation surface side of said semiconductor substrate; a first transistor provided on said first region; a second region of an reverse-conductivity-type formed at the element formation surface of said semiconductor substrate; a second transistor provided on said second region; and a lower region of the reverse-conductivity-type formed on a bottom side relative to said first region and said second region, and coming in contact with a lower surface of said second region, wherein said lower region includes, in a plan view, an opening that vertically penetrates said lower region, wherein said first region and a bottom-side region of said semiconductor substrate are electrically connected to each other through said opening, wherein the lower region in each of said plurality of transistor formation regions is isolated from said lower region in others of said plurality of transistor formation regions, and wherein the second region in each of said plurality of transistor formation regions is isolated from said second region in others of said plurality of transistor formation regions.