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

Claim 8:
9. The nitride semiconductor laminate according to claim 4, wherein an absorption coefficient α in a wavelength range of at least 1 μm or more and 3.3 μm or less is approximated by equation (1) by a method of least squares, and
an error of the measured absorption coefficient at a wavelength of 2μ with respect to the absorption coefficient α obtained from the equation (1) is within ±0.1α,
where a wavelength is λ (μm), an absorption coefficient of the substrate at 27° C. is α (cm−1), a carrier concentration in the substrate is Ne (cm−3), and K and a are constants.