Patent ID: 8765507

Claim:
A method for manufacturing a Group III nitride semiconductor, comprising: a sputtering step of forming a single-crystalline Group III nitride semiconductor on a substrate by a reactive sputtering method in a chamber in which a substrate and a Ga element-containing target are disposed, wherein said sputtering step includes respective substeps of: a first sputtering step of performing a film formation of the Group III nitride semiconductor while setting the temperature of the substrate to a temperature T 1 ; and a second sputtering step of continuing the film formation of the Group III nitride semiconductor while lowering the temperature of the substrate to a temperature T 2 which is lower than the temperature T 1 , further comprising: a vacuum step of removing an oxygen layer attached to the surface of the substrate, by preparing a vacuum state in the chamber and heating the substrate to the temperature T 1 , wherein said first sputtering step and second sputtering step are performed in this order following said vacuum step.