Patent ID: 9461036
Filing Date: 2016-10-04
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a semiconductor substrate; a first first-conductivity type region formed in the semiconductor substrate; a second-conductivity type region formed in a surface layer of the first first-conductivity type region; a first semiconductor layer located over the second-conductivity type region; a second first-conductivity type region formed in the first semiconductor layer with a bottom thereof coupled to the second-conductivity type region; a first contact coupled to the first first-conductivity type region; a second contact coupled to the second-conductivity type region; a third contact coupled to the second first-conductivity type region, and a second-conductivity type separation region formed in the semiconductor substrate, surrounding side and bottom faces of the first first-conductivity type region, wherein the semiconductor substrate is of the first-conductivity type.