Abstract
The optical constants of SbI3 single crystals, prepared from solution, were calculated from normal incidence reflectance data via a Kramers-Kronig analysis. The dependence of the absorption coefficient on the photon energy suggests the presence of a direct allowed interband transition whereE dg =2·225 eV at room temperature, as well as indirect phonon-assisted transition. The absorption coefficient follows Urbach's empirical relation in the range 2·08–2·34 eV near the intrinsic edge, and a Gaussian shape was obtained near the band maximum. This behaviour is indicative of its excitonic origin and may be contributed to localized excitons in the crystal.
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Mady, K.A., Eid, A.H. & Soliman, W.Z. Optical properties and interband transitions in the layered compounds SbI3 . Czech J Phys 29, 907–912 (1979). https://doi.org/10.1007/BF01596368
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DOI: https://doi.org/10.1007/BF01596368