Patent ID: 8704239

Claim:
A layered body having a single crystal layer comprising a group III nitride satisfying a composition shown by Al X Ga Y In Z N (wherein, X, Y and Z are rational numbers respectively satisfying 0.9≦X≦1.0, 0.0≦Y≦0.1, 0.0≦Z≦0.1, and X+Y+Z=1.0) on a sapphire substrate, and said layered body has an initial single crystal layer comprising the group III nitride satisfying said composition and containing oxygen in a concentration of 5×10 20 cm −3 or more and 5×10 21 cm −3 or less in a thickness of 3 nm or more and less than 15 nm on said sapphire substrate, and a second group III nitride single crystal layer comprising the group III nitride satisfying said composition having reduced oxygen concentration than the initial single crystal layer on the initial single crystal layer.