Patent ID: 7492031
Filing Date: 2009-02-17
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first base layer of a first conductive type which has a first surface and a second surface; a second base layer of a second conductive type which is formed on the first surface; a source layer of a first conductive type which is formed on a surface region of the second base layer; an emitter layer of the second conductive type which is formed on the second surface; a first gate electrode which is formed on the second base layer via a gate insulating layer between the source layer and the first base layer; a second gate electrode which is formed on the first base layer via a gate insulating layer and is formed at a site apart from the first gate electrode; an emitter electrode which is formed on the second base layer and the source layer; and a collector electrode which is formed on the emitter layer.