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

Claim 0:
1. 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
X-ray rocking curve measurement for (0002) plane diffraction, which is performed to the main surface by irradiating with (Cu) Kα1 X-rays through a two-crystal monochromator of Ge (220) plane and a slit on a Ge (220) plane, reveals that:
FWHMb is 32 arcsec or less, and
difference FWHMa-FWHMb obtained by subtracting FWHMb from FWHMa is 30% or less of FWHMa,
wherein FWHMa is full width at half maximum of the (0002) plane diffraction when a slit width in ω direction is 1 mm, and
FWHMb is full width at half maximum of the (0002) plane diffraction when a slit width in w direction is 0.1 mm.