Patent ID: 7449404

Claim:
A method for controllably doping a Group III-nitride material with Mg comprising: heating a plurality of reactor surfaces to a first temperature, the first temperature being higher than a magnesium precursor gas-ammonia adduct condensation temperature; heating at least one precursor gas to a second temperature prior to mixing of the at least one precursor gas, a magnesium precursor gas, and an ammonia gas, said second temperature being sufficiently high to provide a mixed gas temperature following mixing of the at least one precursor gas, the magnesium precursor gas, and the ammonia gas that is higher than the magnesium precursor gas-ammonia adduct condensation temperature; mixing the at least one precursor gas, the magnesium precursor gas, and the ammonia gas to form a mixed gas; and reacting the mixed gas with a surface of the Group III nitride material, thereby depositing a magnesium-doped Group III nitride layer.