Trapping center parameters of TlGaSe2 layered crystals


Yuksek N., Kavas H., Gasanly N. , Ozkan H.

PHYSICA B-CONDENSED MATTER, cilt.344, ss.249-254, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 344
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1016/j.physb.2003.09.266
  • Dergi Adı: PHYSICA B-CONDENSED MATTER
  • Sayfa Sayıları: ss.249-254

Özet

Thermally stimulated current measurements are carried out on as-grown TlGaSe2 layered single crystals in the temperature range of 90-220 K with various heating rates. Experimental evidence is found for the presence of two trapping centers with activation energy 98 and 130 meV. The retrapping process is negligible for these levels, as confirmed by good agreement between the experimental results and theoretical predictions of the model that assumes slow retrapping. The calculation yielded 2.3 x 10(-24) and 1.8 x 10(-24) cm(2) for the capture cross section and 1.4 x 10(14) and 3.8 x 10(14) cm(-3) for the concentration of the traps studied. (C) 2003 Elsevier B.V. All rights reserved.