Patent ID: 8404508

Claim:
A method of forming an enhancement mode GaN transistor, the method comprising: nucleating and growing transition layers on a substrate; growing an III Nitride EPI layer over the transistor layers; growing an III Nitride barrier layer over the EPI layer; growing a GaN layer with acceptor type dopants over the barrier layer; depositing a gate contact layer on the doped GaN layer; applying a gate photo resistant pattern; etching away the gate contact layer outside the gate region; etching away the doped GaN layer, except a portion of the doped GaN layer beneath the gate contact; removing the gate photo resistant pattern; depositing a dielectric layer; applying a contact photo resistant pattern; etching the dielectric layer to open the drain and source contact area; removing the contact photo resistant pattern; depositing an Ohmic contact metal; applying a metal photo resistant pattern; etching the Ohmic contact metal; removing the metal photo resistant pattern; and performing rapid thermal annealing to form Ohmic drain and source contacts.