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Effects of Substrate Temperature on Structural and Optical Properties of Spray-Pyrolyzed Cu(Ga0.3In0.7)Se2 Thin Films on Polyimide Plastic Substrate

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Abstract

Chalcopyrite copper indium gallium diselenide Cu(Ga0.3In0.7)Se2 films have been deposited on polyimide (PI) plastic substrate by chemical spray pyrolysis using different substrate temperatures in the range from 350°C to 395°C. The influence of substrate temperature on the structural and optical properties of the CIGS films was studied. High-resolution x-ray diffraction results revealed that the films exhibited chalcopyrite-type structure. The crystallite size of the films increased with increasing substrate temperature, as did their root-mean-square surface roughness. Optical transmission measurements by ultraviolet–visible (UV–Vis) spectrophotometer showed that the optical bandgap decreased from 1.28 eV to 1.16 eV as the substrate temperature was increased. This variation of the crystallite size and energy bandgap with substrate temperature makes such films a promising candidate for application in optoelectronic devices such as photoconductors and solar cells.

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Acknowledgements

M.G.F. thanks Koya University and Erasmus Mundus Marhaba program for permission to carry out research activities abroad. P.T. thanks MINECO for Project MAT2016-80266R.

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Authors and Affiliations

  1. Grupo de Física de Coloides y Polímeros, Departamento de Física de la Materia Condensada, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain

    M. G. Faraj & P. Taboada

  2. Department of Physics, Faculty of Science and Health, Koya University, University Park, Koysinjaq, Kurdistan Region, Iraq

    M. G. Faraj

  3. Nano-Optoelectronics Research and Technology Laboratory, School of Physics, Universiti Sains Malaysia, 11800, Penang, Malaysia

    M. Z. Pakhuruddin

Authors
  1. M. G. Faraj
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  2. M. Z. Pakhuruddin
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  3. P. Taboada
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Correspondence to M. G. Faraj.

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Faraj, M.G., Pakhuruddin, M.Z. & Taboada, P. Effects of Substrate Temperature on Structural and Optical Properties of Spray-Pyrolyzed Cu(Ga0.3In0.7)Se2 Thin Films on Polyimide Plastic Substrate. J. Electron. Mater. 46, 6745–6749 (2017). https://doi.org/10.1007/s11664-017-5746-8

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  • DOI: https://doi.org/10.1007/s11664-017-5746-8

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