Patent ID: 8436367
Filing Date: 2013-05-07
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; first and second body regions in the upper layer and adjoining the upper surface of the substrate and spaced apart about the drift region, the body regions being of a second dopant type opposite the first dopant type and having opposed lateral peripheries each forming a first PN junction with the drift region; first and second source regions positioned respectively in the first and second body regions across the upper surface of the substrate to define first and second source contact regions and located with respect to the opposed lateral peripheries of the body region to form a second PN junction spaced laterally from the first PN junction and to define first and second 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; and a source conductor contacting the source regions and the body region therebetween; a portion of the first channel region being muted with respect to the second channel region so that the second channel region becomes conductive before the muted portion of the first channel region becomes conductive.