Patent ID: 8476691
Filing Date: 2013-07-02
Classification: H01L

Abstract:
1. A high voltage power semiconductor device comprising: a substrate having an upper surface and including an active device area having a periphery and a junction termination area surrounding the active device area, the substrate being formed of a doped silicon layer of a first polarity; a junction termination structure including one or more regions of a second polarity opposite the first polarity formed in the substrate and extending to the surface thereof to form one or more termination junctions in the junction termination area surrounding the active device; a tunneling oxide layer overlaying the junction termination area surrounding the active device area in contact with the silicon substrate upper surface; a layer consisting of undoped polysilicon overlaying the tunneling oxide layer and spanning the junction termination area in contact with the silicon substrate upper surface; and electrical connections of the undoped polysilicon layer to an outer edge of the junction termination structure and to a grounded electrode inside of the active area; the tunneling oxide layer having a thickness that permits hot carriers formed at substrate upper surface to pass through the tunneling oxide layer into the undoped polysilicon layer to be dissipated.