Patent ID: 8674439
Filing Date: 2014-03-18
Classification: H01L

Abstract:
1. A silicon carbide (SiC) vertical power MOSFET structure, comprising: a SiC substrate including an upper layer of a first dopant type defining a drift region extending from an upper surface of the substrate depthwise into the substrate; a body region in the upper layer and adjoining the upper surface of the substrate, the body region being of a second dopant type opposite the first dopant type and having opposite lateral peripheries each forming a first PN junction with the drift region; a pair of source regions spaced apart in the body region across the upper surface of the substrate to define source contact regions and positioned with respect to the lateral peripheries of the body region to form a second PN junction spaced laterally from the first PN junction and to define a pair of channel regions along the upper surface between the first and second PN junctions; a gate oxide layer on the upper surface extending over each of the channel regions; a gate conductor contacting the gate oxide; a source conductor contacting the source regions and the body region therebetween; and a pair of counterdoped regions extending along the opposite lateral peripheries of the body region, the counterdoped regions spaced below the channel regions and away from the source regions and having a doping concentration less than a doping concentration of the body region at the upper surface.