Patent ID: 8115211
Filing Date: 2012-02-14
Classification: H01L

Abstract:
1. A silicon carbide semiconductor device comprising: a first conductive-type semiconductor substrate; a first conductive-type silicon carbide layer provided on a surface of the semiconductor substrate; second conductive-type well regions selectively provided in the silicon carbide layer at a predetermined depth thereof separated from each other in a predetermined distance; first conductive-type source regions selectively provided in portions sandwiched between the surface of the silicon carbide layer and respective well regions; second conductive-type contact regions provided in portions sandwiched between the surface of the silicon carbide layer and respective well regions so as to contact outer sides outside respective source regions; second conductive-type channel regions provided in portions sandwiched between the surface of the silicon carbide layer and respective well regions so as to contact inner sides outside respective source regions; a gate insulation film provided over the source regions and the channel regions on the surface of the silicon carbide layer, and over an exposed portion of the silicon carbide layer sandwiched between the channel regions; gate electrodes provided on the surface of the gate insulation film, over respective channel regions, a part of respective source regions provided in outer outsides of the channel regions, and the exposed portion of the silicon carbide layer; a first main electrode provided on the surface of the silicon carbide layer, over the contact regions and the source regions; and a second main electrode provided on a rear face of the semiconductor substrate; and the well regions, the channel regions, and the gate electrodes being formed so that, given that extending lengths, with respect to the inner sides of the source regions, of each of the well regions, the channel regions, and the gate electrodes are Lwell, Lch, and Lg, respectively, a relationship of Lch<Lg<Lwell is satisfied.