Patent ID: 9093284
Filing Date: 2015-07-28
Classification: H01L

Abstract:
1. A method of 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 first metallic structure electrically coupled to the second surface of the n-type GaN substrate; forming an AlGaN epitaxial layer coupled to the n-type GaN epitaxial layer, wherein the AlGaN epitaxial layer is characterized by an aluminum mole fraction ranging from about 0.01 to about 0.5; forming a p-type GaN epitaxial layer coupled to the AlGaN epitaxial layer; and removing at least a portion of the p-type GaN epitaxial layer using a photo-enhanced chemical etching process to: