On the energy spectrum of vitreous arsenic sulphide

A brief review of an experimental study of reflectivity, absorption and photoconductivity spectra, and current-voltage characteristics of vitreous arsenic sulphide is presented. The absorption spectra were obtained in the high absorption range up to K = 105 cm−1. The value of the forbidden band Eg o...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1970-04, Vol.4, p.45-56
Main Authors: Kolomiets, B.T., Mazets, T.F., Efendiev, Sh.M., Andriesh, A.M.
Format: Article
Language:English
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Summary:A brief review of an experimental study of reflectivity, absorption and photoconductivity spectra, and current-voltage characteristics of vitreous arsenic sulphide is presented. The absorption spectra were obtained in the high absorption range up to K = 105 cm−1. The value of the forbidden band Eg of vitreous As2S3 obtained from the optical data is 2.4 eV. It is shown that the absorption edge at energies E < Eg has an exponential character due to localized states near the allowed band edges. Under the action of an electric field the exponential absorption edge shifts to a lower energy range obeying Franz' theory. From a study of the photoconductivity spectra and current-voltage characteristics in the nonlinear range some conclusions can be made concerning the energy distribution of the localized states in the forbidden band of the amorphous arsenic sulphide films.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(70)90019-0