Low-temperature absorption edge and photoluminescence in layered structured Tl2Ga2S3Se single crystals

Gasanly N.

PHYSICA B-CONDENSED MATTER, vol.407, no.21, pp.4318-4322, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 407 Issue: 21
  • Publication Date: 2012
  • Doi Number: 10.1016/j.physb.2012.07.025
  • Journal Name: PHYSICA B-CONDENSED MATTER
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.4318-4322
  • Middle East Technical University Affiliated: Yes

Abstract

The absorption edge of undoped Tl2Ga2S3Se crystals have been studied through transmission and reflection measurements in the wavelength range 440-1100 nm and in the temperature range 10-300 K. The absorption edge was observed to shift toward lower energy values with increasing temperature. As a result, the rate of the indirect band gap variation with temperature gamma = -2.6 x 10(-4) eV/K and the absolute zero value of the band gap energy E-gi(0)=2.42 eV were obtained.