Patent ID: 11970784
Assignee: SUMITOMO CHEMICAL COMPANY LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC C

Claim 18:
19. The laminated structure according to claim 16, wherein a reduction rate of a dislocation density obtained by N/N0 is smaller than a reduction rate of a dislocation density obtained by N′/N0,
wherein the dislocation density in the main surface of the base substrate is No and the dislocation density in a boundary surface along the main surface at an upper end of the high oxygen concentration region is N, and the dislocation density in a surface of a crystal layer is N′ when the crystal layer of a group III nitride semiconductor is epitaxially grown on the main surface of the base substrate to a thickness equal to a thickness from the main surface to the boundary surface of the base substrate, with only a (0001) plane as a growth surface.