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

Claim 5:
6. A nitride semiconductor substrate having a diameter of 2 inches or more and having a main surface,
wherein a lowest index crystal plane closest to the main surface is a (0001) plane over the entirety of the main surface, and
observation of the main surface of the nitride semiconductor substrate using a multiphoton excitation microscope in a field of view of 250 μm square to obtain a dislocation density from a dark spot density, reveals that the dislocation density is less than 1×106 cm−2 over 95% or more of the main surface, and the main surface includes non-overlapping 50 μm square dislocation-free regions at a density of 100/cm2 or more.