Patent ID: 11908688
Assignee: SUMITOMO CHEMICAL COMPANY LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C | IPC H

Claim 10:
11. The laminated structure according to claim 8,
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 N0 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 the 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 the (0001) plane as a growth surface.