Photoelectrical properties of TlGaSe2 single crystals

Date

2014-07-01

Author

Özdemir, Salahattin
Bucurgat, Mahmut

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The spectral distribution of photocurrent (PC) of TlGaSe2 single crystals in the range of wavelengths between 500 nm and 700 nm possesses a single maximum at 2.04 eV corresponds to the direct energy band gap of this crystal. The PC is enhanced dramatically by pre-illuminations at low temperatures with band gap light. The temperature dependence of PC of the sample investigated in the temperature range from 80 K to 300 K at constant heating rate shows that the overlapping peaks in the PC spectrum are direct reflection of the Thermally Stimulated Current (TSC) associated with the several trapping levels. The PC response is strongly dependent on the degree of occupancy of traps. The wavelength at the maximum of the PC spectrum is found to be dependent on the wavelength scan direction being up or down. The ferroelectric phase transitions of TlGaSe2 are detected at similar to 108 K and similar to 118 K in the PC spectrum. (C) 2014 Elsevier Masson SAS. All rights reserved.

Subject Keywords

TlGaSe2 crystals, Photoconductivity, Spectral distribution, Recombination and trapping, Temperature dependence

URI

https://hdl.handle.net/11511/48438

Collections

Department of Physics, Article