Patent ID: 11873578
Assignee: SUMITOMO CHEMICAL COMPANY LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 10:
11. A nitride semiconductor substrate that is constituted by a crystal of a group III nitride semiconductor and includes a main surface for which the closest low index crystal plane is a (0001) plane,
wherein, when dislocations are detected based on dark spots by observing the main surface using a multiphoton excitation microscope in a field of view of 250 μm square,
the main surface does not include a region that has a dislocation density higher than 5×106 cm−2,
the main surface includes a plurality of dislocation arrays each constituted by at least three dislocations that are arranged at intervals of 1 μm or less along a predetermined direction,
the plurality of dislocation arrays include paraxial dislocation arrays each extending along a direction that forms an angle of 10° or less with respect to a <11-20> axis direction or a <1-100> axis direction, and
the density of the plurality of dislocation arrays in the main surface is 1×106 arrays/cm2 or less.