Patent ID: 8124505
Filing Date: 2012-02-28
Classification: H01L

Abstract:
1. A method of fabricating an Enhancement mode Heterojunction Field Effect Transistor (HFET) device, the method comprising: receiving a device substantially comprising a depletion mode HFET wherein a barrier layer and channel layer of the HFET comprise Gallium Nitride (GaN) and Aluminum Gallium Nitride (AlGaN) respectively; forming an enhancement mode gate region in the depletion mode HFET by repeated cycles of; a) forming oxidized AlGaN in the gate region of the barrier layer in the depletion mode HFET with Oxygen (O2) plasma for a first time; then b) etching the oxidized AlGaN in the depletion mode HFET with Boron Trichloride (BC13) for a second time.