The composition dependence of the optical band gap in Ge doped Se-Te glassy alloy

Authors

MAINIKA KAPOOR
NAGESH THAKUR

DOI

10.3906/fiz-1008-16

Abstract

Bulk glasses with the chemical composition (Se_{80}Te_{20})_{100-x}Ge_x (x = 0, 2, 4, 6) have been prepared from high purity constituent elements. Fragments of the bulk glasses are used to deposit thin films by vacuum thermal evaporation and compositional dependence of the optical and physical properties have been studied. It has been found that optical absorption is due to indirect transition and the optical band gap E_g increases with increasing Ge content in Se-Te glassy alloy. The relationship between the E_g and chemical composition is discussed in terms of cohesive energy and co-ordination number.

Keywords

Chalcogenides, thin films, optical band gap, Se-Te-Ge

First Page

23

Last Page

29

Recommended Citation

KAPOOR, MAINIKA and THAKUR, NAGESH (2012) "The composition dependence of the optical band gap in Ge doped Se-Te glassy alloy," Turkish Journal of Physics: Vol. 36: No. 1, Article 3. https://doi.org/10.3906/fiz-1008-16
Available at: https://journals.tubitak.gov.tr/physics/vol36/iss1/3