Patent ID: 11946874
Assignee: SUMITOMO CHEMICAL COMPANY LIMITED
Field: Measurement (Instruments)
Classification: CPC G  C  H | IPC G  H

Claim 1:
2. A nitride semiconductor laminate, comprising:
a substrate comprising group III nitride semiconductor crystals; and
a thin film homoepitaxially grown on the substrate,
wherein a dislocation density on a main surface of the substrate is 5×106 pieces/cm2 or less, a concentration of oxygen in the substrate is less than 1×1017 at ·cm−3, and a concentration of impurities other than n-type impurity in the substrate is less than 1×1017 at ·cm−3, and
when taking into consideration of a deviation of an amount of reflected light at a predetermined wavenumber in a reflection spectrum obtained by irradiating the thin film on the substrate with infrared light, from an amount of reflected light at the predetermined wavenumber determined according to a film thickness of the thin film, a carrier concentration of the substrate, and a carrier concentration of the thin film, a maximum value of a degree of a deviation in a wavenumber range of 1,600 cm−1 or more and 1,700 cm−1 or less is larger than any of a maximum value of a degree of a deviation in a wavenumber range of 1,500 cm−1 or more and less than 1,600 cm−1 and a maximum value of a degree of a deviation in a wavenumber range of more than 1,700 cm−1 and 1,800 cm−1 or less.