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Exciton photoluminescence, photoconductivity and absorption in GaSe0.9Te0.1 alloy crystals |
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| Authors: | G.M. Mamedov,H. Ertap,Ö . Ö ktü |
| Affiliation: | a Faculty of Science and Letters, Department of Physics, Kafkas University, 36100 Kars, Turkey b Faculty of Engineering, Department of Physics Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey c National Metrology Institute (UME), 41470 Gebze-Kocaeli, Turkey |
| Abstract: | The photoluminescence, photoconductivity and absorption in GaSe0.9Te0.1 alloy crystals have been investigated as a function of temperature and external electric field. It has been observed that the exciton peaks shift to lower energy in GaSe0.9Te0.1 alloy crystals compared to GaSe crystals. The long wavelength tails of interband photoluminescence, photoconductivity and absorption spectra are determined by the free exciton states and show an Urbach-Martienssen-type dependence to the photon energy. The maxima of the extrinsic photoluminescence and photoconductivity spectra were found to be determined by the acceptor centers with an energy of EA=EV+0.19 eV formed by the polytypism and defects complexes that include Se and Te anions. |
| Keywords: | 71.35.&minus y 71.55.&minus I 78.55.&minus m |
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