Patent ID: 7759711

Claim:
A semiconductor device comprising: a semiconductor substrate of a first conductivity type; a RESURF region of a second conductivity type formed in an upper portion of the semiconductor substrate; a base region of the first conductivity type formed in an upper portion of the semiconductor substrate so as to be adjacent to the RESURF region; an emitter/source region of the second conductivity type formed in the base region so as to be apart from the RESURF region; a base connection region of the first conductivity type formed in the base region so as to be adjacent to the emitter/source region; a gate insulating film overlying the emitter/source region, the base region, and the RESURF region; a gate electrode formed on the gate insulating film; a collector region of the first conductivity type formed in the RESURF region so as to be apart from the base region; and an emitter/source electrode formed on the semiconductor substrate and electrically connected to the base connection region and the emitter/source region, wherein the semiconductor substrate has lattice defect such that a resistance value of the semiconductor substrate is twice or more a resistance value of the semiconductor substrate that depends on a concentration of an impurity implanted in the semiconductor substrate.