Patent ID: 7923320

Claim:
A method of fabricating a silicon carbide metal-oxide semiconductor field effect transistor unit cell comprising: providing an n-type silicon carbide drift layer; providing a first p-type silicon carbide region adjacent the drift layer; providing a first n-type silicon carbide region within the first p-type silicon carbide region; providing an oxide layer adjacent the drift layer; and providing an n-type silicon carbide limiting region between the drift layer and a portion of the first p-type silicon carbide region, wherein the n-type limiting region comprises a first portion laterally extending along a floor of the first p-type silicon carbide region and a second portion disposed adjacent to a sidewall of the first p-type silicon carbide region, wherein the n-type limiting region has a carrier concentration that is greater than a carrier concentration of the drift layer, and wherein the first portion has a carrier concentration greater than a carrier concentration of the second portion.