Optical properties and interband transitions in the layered compounds SbI3 |
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Authors: | Kh A Mady A H Eid W Z Soliman |
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Institution: | (1) Physics Department, National Research Centre, Dokki, Cairo, ARE |
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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
g
d
=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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