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

Claim 0:
1. A method for inspecting a film quality for inspecting a film quality of a thin film in a nitride semiconductor laminate obtained by homoepitaxially growing a thin film on a substrate comprising crystals of a group III nitride semiconductor, which is a method for inspecting a film quality of a thin film by detecting a deviation of an amount of reflected light at a predetermined wavenumber determined in a range of 1,600 cm−1 or more and 1,700 cm−1 or less 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, using the substrate in which a dislocation density on its main surface is 5×106 pieces/cm2 or less, a concentration of oxygen therein is less than 1×1017 at ·cm−3, and a concentration of impurities therein other than n-type impurity is less than 1×1017 at ·cm−3.