Patent ID: 9224828
Filing Date: 2015-12-29
Classification: H01L

Abstract:
1. 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; adding a p-type dopant into the n-type GaN epitaxial layer to form a p-type GaN epitaxial layer, wherein the doping concentration of the p-type GaN epitaxial layer is less than 5×10 removing at least a portion of the p-type GaN epitaxial layer to: forming a first metallic structure electrically coupled to the second surface of the n-type GaN substrate; forming an n-type GaN channel region coupled to the at least one p-type gate region, wherein the n-type GaN channel region overlaps the gate region; forming an n-type GaN source region coupled with the n-type GaN channel region, wherein the n-type GaN source region overlaps the gate region; and forming first and second ohmic metal contacts coupled to the at least one p-type gate region and the n-type GaN source region, respectively, wherein the second ohmic metal contact overlaps the gate region; and providing a dielectric between the edge termination structures.