Patent ID: 6573534
Filing Date: 2003-06-03
Classification: H01L,Y10S

Abstract:
A semiconductor device comprising:a semiconductor substrate (1) of a first conductivity type comprising single crystal silicon carbide, a silicon carbide epitaxial layer (2) of the first conductivity type which is formed on the main side of the semiconductor substrate, a first semiconductor region (3a, 3b) formed on said silicon carbide epitaxial layer and comprising silicon carbide of a second conductivity type, a second semiconductor region (4a, 4b) formed on said first semiconductor region, comprising silicon carbide of the first conductivity type and separated from the silicon carbide epitaxy layer of the first conductivity type by said first semiconductor, a third semiconductor region (5a, 5b) formed on said semiconductor region, connected to said silicon region, comprising silicon carbide of the first conductivity type, said third semiconductor region comprising a first section (5a) on said first semiconductor region and a second section (5b) other than the first section on said epitaxial layer, said first section (5a) being of higher resistance than said semiconductor substrate (1), said second section (5b) being of lower resistance than said first section (5a), and a gate electrode formed on said third semiconductor region with an insulating layer therebetween, wherein said third semiconductor layer is depleted when no voltage is being applied to said gate electrode so that said semiconductor device has a normally-OFF characteristic.