Patent ID: 7968390

Claim:
A method of making an electronic device, the method comprising the steps of: forming a structure including a support layer, a channel layer adapted to contain an electron gas, and a barrier layer; forming a contact region in the barrier layer; forming at least one ohmic contact electrode over the contact region by depositing a superposition of metallic layers, a first layer of which is in contact with the portion of the barrier layer including the contact region, wherein the contact region includes at least one metal selected from the metals forming the superposition of metallic layers; and annealing the structure at a temperature sufficient to cause at least local alloying between the material of the contact region and the material of the first layer of the electrode; wherein the contact region forming step includes implanting at least one metal selected from the metals forming the superposition of metallic layers in the barrier layer, wherein the metal content in the contact region is between 10 19 and 10 21 atoms per cm 3 after implantation.