Patent ID: 7067361

Claim:
A method of fabricating a metal-semiconductor field-effect transistor comprising: forming a p-type epitaxial layer of selectively doped p-type conductivity silicon carbide on a single crystal silicon carbide substrate, wherein the p-type conductivity silicon carbide has a carrier concentration of from about 1×10 16 to about 1×10 17 cm −3 ; then forming an n-type epitaxial layer of n-type conductivity silicon carbide on the p-type epitaxial layer, wherein the n-type epitaxial layer forms a mesa having sidewalls extending into the n-type layer which define the periphery of the transistor; forming ohmic contacts on the n-type epitaxial layer that respectively define a source and a drain; and forming a Schottky metal contact on the n-type epitaxial layer that is between the ohmic contacts and thereby between the source and the drain; and forming an ONO passivation layer on the sidewalks of the mesa and exposed portions of the n-type epitaxial layer.