Structural, electrical and optical properties of Ge implanted GaSe single crystals grown by Bridgman technique

Date

2006-12-01

Author

KARAAĞAÇ, HAKAN
Parlak, Mehmet
KARABULUT, ORHAN
SERİNCAN, UĞUR
Turan, Raşit
Akinoglu, B. G.

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Structural, optical and electrical properties of Ge implanted GaSe single crystal have been studied by means of X-Ray Diffraction (XRD), temperature dependent conductivity and photoconductivity (PC) measurements for different annealing temperatures. It was observed that upon implanting GaSe with Ge and applying annealing process, the resistivity is reduced from 2.1x10(9) to 6.5x10(5) ohm-em. From the temperature dependent conductivities, the activation energies have been found to be 4, 34, and 314 meV for as-grown, 36 and 472 meV for as-implanted and 39 and 647 meV for implanted and annealed GaSe single crystals at 500 degrees C. Calculated activation energies from the conductivity measurements indicated that the transport mechanisms are dominated by thermal excitation at different temperature intervals in the implanted and unimplanted samples. By measuring photoconductivity (PC) measurement as a function of temperature and illumination intensity, the relation between photocurrent (I-PC) and illumination intensity (Phi) was studied and it was observed that the relation obeys the power law, I-PC alpha Phi(n) with n between 1 and 2, which is indication of behaving as a supralinear character and existing continuous distribution of localized states in the band gap. As a result of transmission measurements, it was observed that there is almost no considerable change in optical band gap of samples with increasing annealing temperatures for as-grown GaSe; however, a slight shift of optical band gap toward higher energies for Ge-implanted sample was observed with increasing annealing. temperatures. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA.

Subject Keywords

General Materials Science, General Chemistry, Condensed Matter Physics

URI

https://hdl.handle.net/11511/36403

Journal

CRYSTAL RESEARCH AND TECHNOLOGY

DOI

https://doi.org/10.1002/crat.200610742

Collections

Department of Physics, Article

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Citation Formats

H. KARAAĞAÇ, M. Parlak, O. KARABULUT, U. SERİNCAN, R. Turan, and B. G. Akinoglu, “Structural, electrical and optical properties of Ge implanted GaSe single crystals grown by Bridgman technique,” CRYSTAL RESEARCH AND TECHNOLOGY, pp. 1159–1166, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36403.