Patent ID: 8431475

Claim:
A method for fabricating a group III-V nitride structure with an ohmic-contact layer, the method comprising: fabricating a group III-V nitride structure with a p-type layer, wherein the p-type layer includes a Mg—H complex; depositing an ohmic-contact layer on the p-type layer without subjecting the p-type layer to a thermal annealing process that disassociates H atoms from the Mg—H complex; and subsequent to depositing the ohmic-contact layer, performing a single annealing process consisting of rapid thermal annealing to simultaneously disassociate the H atoms from the Mg—H complex in the p-type layer and alloy the ohmic-contact layer with the p-type layer at a predetermined temperature for a predetermined period of time, thereby reducing the resistivity of the p-type layer and forming a low-resistivity ohmic contact in a single annealing process, wherein the resistivity of the p-type layer is reduced to less than 10 ohm·cm, and wherein the single annealing process consisting of rapid thermal annealing uses O 2 as ambient gas.