Urbach's tail in the absorption spectra of the ordered vacancy compound CuGa3Se5

被引：29

作者：

Wasim, SM ^{[1
]}

Marín, G ^{[1
]}

Rincón, C ^{[1
]}

Bocaranda, P ^{[1
]}

Pérez, GS ^{[1
]}

机构：

[1] Univ Los Andes, Fac Ciencias, Ctr Estudios Semicond, Dept Fis, Merida 5101, Venezuela

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2000年 / 61卷 / 05期

关键词：

semiconductors; optical materials; optical properties;

D O I：

10.1016/S0022-3697(99)00345-5

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The presence of Urbach's tail in the absorption coefficient spectra just below the fundamental absorption edge is observed in several samples of the ordered vacancy compound CuGa3Se5 at different temperatures below 300 K. An empirical relation that takes into account the effect of structural disorder and modification in the contribution of the thermal term, caused due to the deviation from the ideal stoichiometry 1:3:5, is proposed to explain the change of Urbach's energy with temperature. The phonon energy involved in the electron-phonon interaction, in the absence of structural disorder, is estimated to be around 30 meV. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.

引用

页码：669 / 673

页数：5

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