OPTICAL AND PHOTOELECTRIC PROPERTIES OF TLGASE2 LAYERED CRYSTALS


KALOMIROS J., KALKAN N. , HANIAS M., ANAGNOSTOPOULOS A., KAMBAS K.

SOLID STATE COMMUNICATIONS, vol.96, no.8, pp.601-607, 1995 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 96 Issue: 8
  • Publication Date: 1995
  • Doi Number: 10.1016/0038-1098(95)00423-8
  • Journal Name: SOLID STATE COMMUNICATIONS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.601-607
  • Keywords: SEMICONDUCTORS, OPTICAL PROPERTIES, PHOTOCONDUCTIVITY, TERNARY CHALCOGENIDES, EXCITON SPECTRA, TRANSITIONS
  • Istanbul University Affiliated: No

Abstract

Absorption spectra of thin layers of TlGaSe2 crystals are used to study the energy gap and the interband transitions of the compound in the energy region 1.5-3.8 eV and in the temperature range 12-290K. A peak of excitonic origin appears at 2.39 eV at 12K, 0.3 eV above the fundamental direct gap. It is followed by two sharp structures at 2.49 eV and 2.56 eV (12K). A broad structure appears at 2.64 eV. A room temperature reflection spectrum is also presented. The temperature dependence of the critical energies of all the observed structures is given. The dependence of the broadening parameter on temperature and the binding energy of the main exciton peak are also presented.