Optical properties of amorphous Se films prepared by PECVD

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• 作者：Nagels ; P. ; Sleeckx ; E. ; Callaerts ; R. ; Gonzá ; lez ; J.M. ; Bernal-Oliva ; A.M. ; Má ; rquez ; E.
• 刊名：Solid State Communications
• 出版年：1997
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：May, 1997
• 卷：102
• 期：7
• 页码：539-543
• 文件大小：350 K

摘要

The optical transmission spectrum of amorphous Se films prepared by plasma-enhanced chemical vapour deposition was measured over the 500 to 2000 nm spectral region. The absorption coefficient values plotted vs photon energy according to Tauc's law yielded an optical gap, E_g, of 1.94 eV. The temperature dependence of E_g was measured between 13 K and 300 K and was found to be well described within Fan's one-phonon approximation. Photo-induced darkening of the optical gap was studied by illumination at 13 K and 77 K.