Patent ID: 7205629

Claim:
A lateral superjunction field effect transistor (LSJFET) comprising: one or more layers having a first and a second surface including at least one layer formed of a widebandgap semiconductor having a first conductivity type; a resurf layer of the widebandgap semiconductor having a second conductivity type formed on the at least one layer of the first conductivity type at the first surface; a backside gate formed on the second surface of the one or more layers; a source region in contact with the resurf layer; a drain region, in contact with the resurf layer and spaced apart from the source region; a current conduction path in the resurf layer between the source region and the drain region; and a gate region in contact with the resurf layer between the source region and the drain region, having the first conductivity type, wherein the at least one layer is a backgate layer having a carrier concentration of dopant atoms of less than 10 17 cm −3 .