Specific features of the optical spectra in Tl2In2S3Se layered single crystals

被引：11

作者：

Gasanly, N. M. ^{[1
]}

Guler, I. ^{[1
]}

Goksen, K. ^{[1
]}

机构：

[1] Middle E Tech Univ, Dept Phys, TR-06531 Ankara, Turkey

来源：

CRYSTAL RESEARCH AND TECHNOLOGY | 2007年 / 42卷 / 06期

关键词：

optical constants; dispersion of refractive index; optical band gap; layered crystals;

D O I：

10.1002/crat.200610874

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The optical properties of Tl2In2S3Se 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 TI-containing layered crystals. The dispersion of the refractive index is discussed in terms of the Wemple-Di Domenico 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 x 10(13) m(-2) and 3.18, respectively. From X-ray powder diffraction study, the parameters of monoclinic unit cell were determined. (C) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

页码：621 / 625

页数：5

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