Patent ID: 9297093
Filing Date: 2016-03-29
CPC Classification: C30B,H01L

Claim Text:
1. 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 1×10 20 cm −3 or more and 5×10 21 cm −3 or less in a thickness of 15 nm or more and 40 nm or less 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.