Photoelectronic and electrical properties of Tl2InGaS4 layered crystals

Qasrawi A. F., Gasanly N.

SOLID STATE COMMUNICATIONS, cilt.141, sa.3, ss.117-121, 2007 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 141 Sayı: 3
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.ssc.2006.10.011
  • Dergi Adı: SOLID STATE COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.117-121
  • Anahtar Kelimeler: semiconductors, electronic states (localized), photoconductivity and photovoltaic, recombination and trapping, TLGAS2 SINGLE-CRYSTALS, OPTICAL-PROPERTIES, TLINS2 CRYSTALS, PHOTOCONDUCTIVITY, ABSORPTION
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Tl2InGaS4 layered crystals are studied through the dark electrical conductivity, space charge limited current and illumination- and temperature-dependent photoconductivity measurements in the temperature regions of 220-350 K, 300-400 K and 200-350 K, respectively. The space charge limited current measurements revealed the existence of a single discrete trapping level located at 0.44 eV. The dark electrical conductivity showed the existence of two energy levels of 0.32 eV and 0.60 eV being dominant above and below 300 K, respectively. The photoconductivity measurements reflected the existence of two other energy levels located at 0.28 eV and 0.19 eV at high and low temperatures, respectively. The photocurrent is observed to increase with increasing temperature up to a maximum temperature of 330 K. The illumination dependence of photoconductivity is found to exhibit supralinear recombination in all the studied temperature ranges. The change in recombination mechanism is attributed to exchange in the behavior of sensitizing and recombination centers. (C) 2006 Elsevier Ltd. All rights reserved.