OPTICAL AND PHOTOELECTRIC PROPERTIES OF TLGASE2 LAYERED CRYSTALS

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

SOLID STATE COMMUNICATIONS, cilt.96, sa.8, ss.601-607, 1995 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 96 Sayı: 8
  • Basım Tarihi: 1995
  • Doi Numarası: 10.1016/0038-1098(95)00423-8
  • Dergi Adı: SOLID STATE COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.601-607
  • Anahtar Kelimeler: SEMICONDUCTORS, OPTICAL PROPERTIES, PHOTOCONDUCTIVITY, TERNARY CHALCOGENIDES, EXCITON SPECTRA, TRANSITIONS
  • İstanbul Üniversitesi Adresli: Hayır

Özet

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.