Patent ID: 8900985

Claim:
A method of manufacturing a compound semiconductor device, comprising: forming a III-nitride compound semiconductor device structure on a silicon-containing semiconductor substrate, the III-nitride compound semiconductor device structure including a GaN alloy on GaN and a channel region arising near an interface between the GaN alloy and the GaN; forming a SiN layer on the III-nitride compound semiconductor device structure adjacent the GaN alloy, a first Si-containing dielectric layer on the SiN layer and a second Si-containing dielectric layer on the first Si-containing dielectric layer; forming a contact opening which extends through the SiN layer, the first Si-containing dielectric layer and the second Si-containing dielectric layer to at least the GaN alloy; re-growing a region of GaN in the contact opening; and doping the regrown region of GaN exclusively with Si out-diffused from one or more of the SiN layer, the first Si-containing dielectric layer and the second Si-containing dielectric layer to form an ohmic contact which is doped only with the Si out-diffused from the one or more of the SiN layer, the first Si-containing dielectric layer and the second Si-containing dielectric layer.