Patent ID: 7498633
Filing Date: 2009-03-03
Classification: H01L

Abstract:
1. A metal-oxide semiconductor field-effect transistor comprising: a silicon-carbide substrate having a first concentration of first type impurities; a drift semiconductor layer formed on a front side of the semiconductor substrate and having a second concentration of first type impurities less than the first concentration of first type impurities; a current spreading semiconductor layer formed on a front side of the drift semiconductor layer; a first source region; a second source region; a JFET region formed on a front side of the current spreading semiconductor layer and defined between the first source region and the second source region, the JFET region having a third concentration of first type impurities that is greater than the second concentration of first type impurities; a plurality of source regions; and a plurality of base contact regions, wherein the plurality of source regions and the plurality of base contact regions form alternating strips of N-type doped regions and P-type doped regions, the alternating strips being substantially orthogonal to respective source electrodes formed over the first and the second source regions.