Patent ID: 9580304
Date: 2017-02-28
CPC Classifications: B81B,B81C,H01L

Claim:
1. A method of forming a Gallium-Nitride Field Effect Transistor (GaN FET) device, comprising the steps: forming a stack of gallium nitride and aluminum gallium nitride layers as a substrate; forming a cap layer of gallium nitride on the stack; forming a silicon nitride layer on a first surface of the cap layer using a low-pressure chemical vapor deposition (LPCVD) process, the silicon nitride layer having the following properties: forming an etch mask over the silicon nitride layer; removing the silicon nitride layer exposed by the etch mask; subsequently removing the etch mask; and forming a gate of the GaN FET over the cap layer, wherein the gate is in direct contact with the first surface of the cap layer at a center portion of the gate and partially overlaps the silicon nitride layer at end portions of the gate.