Patent ID: 7381992

Claim:
A silicon carbide power semiconductor device, comprising: a first silicon carbide layer having a first conductivity type; a source region in the first silicon carbide layer and having the first conductivity type, the source region having a higher carrier concentration than a carrier concentration of the first silicon carbide layer and extending to a first surface of the first silicon carbide layer; a buried region of silicon carbide of the second conductivity type in the first silicon carbide layer adjacent a bottom portion of the source region and at a depth in the first silicon carbide layer greater than a depth of the source region; a well region of silicon carbide of the second conductivity type in the first silicon carbide layer on a first side of the source region and extending toward the first surface of the first silicon carbide layer, the well region having a lower carrier concentration than a carrier concentration of the buried region; a plug region of silicon carbide of the second conductivity type on a second side of the source region, opposite the first side of the source region, and extending to the first face of the first silicon carbide layer; a gate oxide on the first silicon carbide layer, the well region and the source region; a gate contact on the gate oxide; a source contact on the plug region and the source region; and a drain contact on the first silicon carbide layer opposite the first surface of the first silicon carbide layer.