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Specific features of the optical spectra in Tl2In2S3Se layered single crystals

✍ Scribed by N. M. Gasanly; I. Guler; K. Goksen

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
200 KB
Volume
42
Category
Article
ISSN
0232-1300

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✦ Synopsis

Abstract

The optical properties of Tl~2~In~2~S~3~Se layered single crystals have been studied by means of transmission and reflection measurements in the wavelength range of 450‐1100 nm. The analysis of the absorption data revealed the presence of both optical indirect and direct transitions with energy band gaps of 2.16 and 2.42 eV, respectively. The observed coexistence of indirect and direct energy band gaps is related to the anisotropy of the Tl‐containing layered crystals. The dispersion of the refractive index is discussed in terms of the Wemple‐DiDomenico single‐effective‐oscillator model. The refractive index dispersion parameters: oscillator energy, dispersion energy, oscillator strength and zero‐frequency refractive index were found to be 4.78 eV, 43.58 eV, 13.18 × 10^13^ m^–2^ and 3.18, respectively. From X‐ray powder diffraction study, the parameters of monoclinic unit cell were determined. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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