Patent ID: 8269304

Claim:
A MOS-gate power semiconductor device comprising: a main device area including an active area and an edge termination area; an auxiliary device area horizontally formed outside the main device area so as to include one or more diodes; a plurality of second conductive-type wells formed in a first conductive-type semiconductor substrate; and one or more first conductive-type wells formed in at least one of the plurality of second conductive-type wells located in the auxiliary device area, wherein anode electrodes and cathode electrodes of the one or more diodes are exposed from a surface of the auxiliary device area, wherein the second conductive-type wells are electrically connected to one or more anode electrodes and the first conductive-type wells are electrically connected to one or more cathode electrodes, wherein a main collector region is formed on a bottom of the first conductive-type semiconductor substrate, wherein the MOS-gate power semiconductor device serves as an insulated gate bipolar transistor (IGBT) when the main collector region is formed using P-type ions, and serves as a metal-oxide semiconductor field effect transistor (MOSFET) when the main collector region is formed using N-type ions, wherein a collector electrode is stacked on the main collector region, and wherein the collector electrode is electrically connected to the one or more anode electrodes.