Patent ID: 8124498

Claim:
A method of manufacturing a group III nitride semiconductor layer bonded substrate in which a group III nitride semiconductor layer and a different-composition substrate different in chemical composition from said group III nitride semiconductor layer are bonded with each other, comprising the steps of: implanting ions of at least any of hydrogen and helium in a region having a prescribed depth from one main surface of a group III nitride semiconductor substrate; bonding said different-composition substrate with said main surface of said group III nitride semiconductor substrate; obtaining said group III nitride semiconductor layer bonded substrate by separating said group III nitride semiconductor substrate at said region implanted with said ions; and annealing said group III nitride semiconductor layer bonded substrate at a temperature not lower than 700° C. in an atmosphere of a nitrogen-containing gas to recover crystallinity of said group III nitride semiconductor layer that has been lowered in the step of implanting ions.