Original scientific paper

Crystal structure and optical properties of quaternary systems of Bi-Sb-Te-Se

A. M. Abou El Soud ; Solid State Physics Laboratory, National Research Centre, Dokki, Cairo, Egypt
B. S. Farag ; Solid State Physics Laboratory, National Research Centre, Dokki, Cairo, Egypt
I. S. Ahmed Farag ; Solid State Physics Laboratory, National Research Centre, Dokki, Cairo, Egypt
S. A. Gad ; Solid State Physics Laboratory, National Research Centre, Dokki, Cairo, Egypt
H. A. Zayed ; Physics Department, Girls College for Art, Science and Education, Shams University, Cairo, Egypt

Abstract

The quaternary systems of Bi-Sb-Te-Se were synthesized by direct fusion technique. Thin films of these compounds were prepared by thermal evaporation under vacuum of 10−4 Pa. The structural properties of these compounds in powder and thin film forms were investigated by X-ray diffraction. The optical constants (absorption coefficient and band gap) of the thin films were determined by measurements of IR absorbance in the region 2.5 – 10 µm. Analysis of the optical absorption spectra revealed the existence of two direct energy gaps.

Keywords

Bi-Sb-Te-Se thin films; structural properties; IR absorption; direct energy gaps

Hrčak ID:

302526

URI

https://hrcak.srce.hr/302526

Publication date:

2.3.2008.

Article data in other languages: croatian

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