Patent ID: 8053859
Filing Date: 2011-11-08
Classification: H01L

Abstract:
1. A semiconductor device comprising: a drift layer of a first conductivity type; a first region of the first conductivity type above the drift layer, the resistivity of the first region being lower than the resistivity of the drift layer; a buried insulator region disposed locally between the first region and the drift layer; a region of a second conductivity type between the buried insulator region and the drift layer, the region of the second conductivity type being in contact with the drift layer; a body region of the second conductivity type in contact with the first region; a low-resistance region of the first conductivity type in the body region; a contact region of the second conductivity type in the body region; a front surface electrode connected electrically to the contact region and the low-resistance region; a gate insulator film on the portion of the body region between the first region and the low-resistance region; a gate electrode on the side opposite to the body region with the gate insulator film interposed therebetween; and a second region of the first conductivity type disposed locally between the first region and the drift layer, the resistivity of the second region being lower than the resistivity of the first region.