Wavelength modulated absorption in SiC |
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Authors: | R.G. Humphreys D. Bimberg W.J. Choyke |
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Affiliation: | Royal Signals and Radar Establishment, Gt. Malvern, Worcs., England;Institut für Halbleitertechnik der RWTH Aachen und SFB 56, Templegraben 55, 5100 Aachen, W. Germany;Westinghouse Research Laboratories, Pittsburgh, PA 15235, U.S.A. |
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Abstract: | Wavelength modulated absorption spectra of the free excitons in 6H, 15R and 3C SiC have been measured. The spin-orbit splitting of the valence bands of the uniaxial and cubic polytypes are found to be 7 and 10 meV respectively. Using a new value for the exciton binding energy of 27 meV, an improved value of the fundamental gap of cubic SiC, Eg = 2.417 eV, is derived. Due to the small spin-orbit splitting, the valence bands are highly non-parabolic at low energies. |
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