Patent ID: 8592298

Claim:
A method for fabricating edge termination structures in gallium nitride (GaN) materials, the method comprising: providing a n-type GaN substrate having a first surface and a second surface; forming an n-type GaN epitaxial layer coupled to the first surface of the n-type GaN substrate; forming a growth mask coupled to the n-type GaN epitaxial layer, wherein the growth mask comprises: a layer of in-situ aluminum nitride (AlN) epitaxially coupled to the n-type GaN epitaxial layer, and a layer of silicon dioxide (SiO 2 ) in physical contact with the layer of in-situ AlN; patterning the growth mask to expose at least a portion of the n-type GaN epitaxial layer; forming at least one p-type GaN epitaxial structure coupled to the at least a portion of the n-type GaN epitaxial layer, the at least one p-type GaN epitaxial structure comprising at least one portion of an edge termination structure; and forming a first metal structure electrically coupled to the second surface of the n-type GaN substrate.