Patent ID: 8035158
Filing Date: 2011-10-11
Classification: H01L

Abstract:
1. A semiconductor device comprising: a drift region of a first conductivity type; a trench gate structure formed in the drift region, the trench gate structure having a gate insulating film and a gate electrode therein; base regions of a second conductivity type formed in the drift region; source regions of the first conductivity type formed in the base regions, respectively; a field oxide film formed in the drift region and surrounding the trench gate structure; first column regions of the second conductivity type formed in the drift region, the first column regions being formed beneath the base regions, respectively; and second column regions of the second conductivity type formed in the drift region, the second column regions being formed beneath the field oxide film, wherein an inner edge of the field oxide film is located in a space between outermost column regions of the first column regions and innermost column regions of the second column regions.