Patent ID: 9508838
Filing Date: 2016-11-29
CPC Classification: H01L

Claim Text:
1. A method for fabricating a vertical power device, the method comprising: providing a III-nitride substrate; forming a first III-nitride epitaxial layer coupled to the III-nitride substrate, wherein the first III-nitride epitaxial layer is characterized by a first dopant concentration; forming a second III-nitride epitaxial layer coupled to the first III-nitride epitaxial layer, wherein the second III-nitride epitaxial layer has a second dopant concentration of the same type and less than or equal to the first dopant concentration; forming a multilayered structure coupled to the second III-nitride epitaxial layer, the multilayered structure including a third III-nitride epitaxial layer and an indium gallium nitride (InGaN) layer, wherein both the third III-nitride epitaxial layer and the InGaN layer have a third dopant concentration of the same type and greater than the first dopant concentration; removing at least a portion of the multilayered structure and at least a portion of the second III-nitride epitaxial layer to form a channel region of the second III-nitride epitaxial layer; forming an epitaxial layer of an opposite type from the first III-nitride epitaxial layer coupled to the channel region; forming a first metallic structure electrically coupled to the III-nitride substrate; forming a second metallic structure electrically coupled to the epitaxial layer of the opposite type; and forming a third metallic structure electrically coupled to the multilayered structure.