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Characterization of Co-evaporated Cu-Ag-In-Se Thin Films

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Abstract

In this study, annealing effect on the structural, electrical, and optical characteristics of the quaternary Cu-Ag-In-Se (CAIS) thin films was investigated. These samples were deposited by co-evaporation of the Cu, Ag, In2Se3, and Se sources at the substrate temperature of 300 °C. The structural properties of the thin films were analyzed by means of X-ray diffraction, and the results indicated that all of the films were in the polycrystalline structure with the preferred orientation along (112) direction. From the optical measurements, the band gap values were found to vary between 1.38 and 1.45 eV with annealing processes. The temperature-dependent electrical conductivity of the samples was measured in the temperature range of 90–400 K. The films gained degenerate behavior with increasing annealing temperature. The carrier conduction mechanism was determined at high- and low-temperature regions by comparing thermionic emission and hopping parameters. Photoconductivity of the as-grown film showed that there was an increase in conductivity with increasing illumination intensity. From this measurement, the variation of photocurrent as a function of illumination intensity was determined.

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Acknowledgments

The authors would like to thank to TUBITAK-BIDEB for the financial supports during this study.

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Authors and Affiliations

  1. Department of Physics, Middle East Technical University (METU), Ankara, 06800, Turkey

    H. H. Güllü, E. Coşkun & M. Parlak

  2. Department of Physics, Çanakkale Onsekiz Mart University, Çanakkale, 17100, Turkey

    E. Coşkun

  3. Center for Solar Energy Research and Applications (GÜNAM), METU, Ankara, 06800, Turkey

    H. H. Güllü, E. Coşkun & M. Parlak

Authors
  1. H. H. Güllü
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  2. E. Coşkun
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  3. M. Parlak
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Correspondence to H. H. Güllü.

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Güllü, H.H., Coşkun, E. & Parlak, M. Characterization of Co-evaporated Cu-Ag-In-Se Thin Films. Braz J Phys 44, 719–725 (2014). https://doi.org/10.1007/s13538-014-0270-2

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