Temperature-dependent absorption edge and photoconductivity of Tl2In2S3Se layered single crystals

Date

2013-02-15

Author

Güler, Işıkhan
Ligonzo, T.
Hasanlı, Nızamı

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Temperature variation of indirect band gap of Tl2In2S3Se layered single crystals were obtained by means of absorption and photoconductivity measurements. The temperature coefficient of -7.1 x 10(-4) eV/K from absorption measurements in the temperature range of 10-300 K in the wavelength range of 520-1100 nm and -5.0 x 10(-4) eV/K from PC measurements in the temperature range of 132-291 K in the wavelength range of 443-620 nm upon supplying voltage V = 80 V were obtained. From the analysis of dark conductivity measurements in the temperature range of 150-300 K, conductivity activation energy was obtained as 0.51 eV above 242 K. The degree of the disorder, the density of localized states near Fermi level, the average hopping distance and average hopping energy of Tl2In2S3Se crystals were found as, 1.9 x 10(5) K, Nf = 4 x 10(20) cm(-3)eV(-1), 29.1 angstrom and 24.2 meV in the temperature range of 171-237 K, respectively. Activation energy of hopping conductivity at T = 171 K was obtained as 41.3 meV and the concentration of trapping states was found as 1.6 x 10(19) cm(-3).

Subject Keywords

Absorption, Photoconductivity, Layered single crystals

URI

https://hdl.handle.net/11511/30583

Journal

JOURNAL OF ALLOYS AND COMPOUNDS

DOI

https://doi.org/10.1016/j.jallcom.2012.10.133

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

I. Güler, T. Ligonzo, and N. Hasanlı, “Temperature-dependent absorption edge and photoconductivity of Tl2In2S3Se layered single crystals,” JOURNAL OF ALLOYS AND COMPOUNDS, pp. 471–474, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30583.