Patent ID: 9601638
Date: 2017-03-21
CPC Classifications: H01L

Claim:
1. A method of forming a low leakage current switching device, comprising: forming one or more elevated mesa islands in a gallium nitride substrate layer, each elevated mesa island having mesa sidewalls and an elevated surface of the gallium nitride substrate layer that is vertically and laterally displaced from a upper facing surface of the gallium nitride substrate layer; forming one or more ohmic alloy source/drain contact layers on the elevated surface of the one or more elevated mesa islands; then forming an implant mask to protect an interior portion of each elevated surface of the elevated mesa island while leaving uncovered the mesa sidewalls and a peripheral region around each elevated surface of the elevated mesa island; and forming an isolation region for each elevated mesa island by using the implant mask to implant ions into an upper portion of the mesa sidewalls and the peripheral region uncovered by the implant mask layer, thereby forming the isolation region to extend into a portion of the elevated mesa island.