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Role of [Cu]/[In] Molar Ratio in Controlling Structural, Morphological and Optical Properties of Sprayed CuInS2 Thin Films

Received: 25 October 2018    Accepted: 10 November 2018    Published: 18 December 2018
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Abstract

CuInS2 thin films were deposited by chemical spray pyrolysis from aqueous solutions containing CuCl2, InCl. and thiourea at substrate temperature of 300°C and annealed at 500°C in air. [Cu]/[In] molar ratio was varied from 0.8 to 1.4 in precursor solution. The influence of [Cu]/[In] molar ratio on structural, morphological and optical properties of CuInS2 thin films was investigated. X-ray diffraction analysis shows that all the films have chalcopyrite structure with the preferential orientation along (112) plane. CuInS2 films with indium excess have poor crystallinity and consist of large quantity of small particles while copper-rich films exhibit good crystallinity with large grains. The best film crystallinity is obtained for [Cu]/[In] = 1.2. The scanning electron microscopy and atomic force microscopy images indicated that [Cu]/[In] molar ratio has a strong influence on the microstructure and surface morphology of the films. It was observed that films obtained with [Cu]/[In] ratio of 0.8 are porous. But films surface became gradually dense with increase in [Cu]/[In] molar ratio. As consequence films roughness decreased from 236.12 nm to 110.30 nm. Optical analysis shows that all the films have good absorbance in the visible. The optical absorbance of films is found to increase with increase in [Cu]/[In] molar ratio.

DOI 10.11648/j.am.20180704.13
Published in Advances in Materials (Volume 7, Issue 4, December 2018)
Page(s) 111-117
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Thin Film, CuInS2, Molar Ratio, Spray Pyrolysis

References
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Author Information
  • Department of Physics, University of Lomé, Lomé, Togo

  • Department of Physics, University of Lomé, Lomé, Togo

  • Post Graduate and Research Department of Physics, AVVM Sri Pushpam College (Autonomous), Thanjavur, India

  • Department of Sciences and Technology, High Normal School of Abidjan, Abidjan, Ivory Coast

  • Department of Physics, University of Lomé, Lomé, Togo

  • Department of Physics, University of Lomé, Lomé, Togo

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    Mazabalo Baneto, Damgou Mani Kongnine, Krishnasamy Ravichandran, Donafolgo Soro, Koffi Sagna, et al. (2018). Role of [Cu]/[In] Molar Ratio in Controlling Structural, Morphological and Optical Properties of Sprayed CuInS2 Thin Films. Advances in Materials, 7(4), 111-117. https://doi.org/10.11648/j.am.20180704.13

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    ACS Style

    Mazabalo Baneto; Damgou Mani Kongnine; Krishnasamy Ravichandran; Donafolgo Soro; Koffi Sagna, et al. Role of [Cu]/[In] Molar Ratio in Controlling Structural, Morphological and Optical Properties of Sprayed CuInS2 Thin Films. Adv. Mater. 2018, 7(4), 111-117. doi: 10.11648/j.am.20180704.13

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    AMA Style

    Mazabalo Baneto, Damgou Mani Kongnine, Krishnasamy Ravichandran, Donafolgo Soro, Koffi Sagna, et al. Role of [Cu]/[In] Molar Ratio in Controlling Structural, Morphological and Optical Properties of Sprayed CuInS2 Thin Films. Adv Mater. 2018;7(4):111-117. doi: 10.11648/j.am.20180704.13

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  • @article{10.11648/j.am.20180704.13,
      author = {Mazabalo Baneto and Damgou Mani Kongnine and Krishnasamy Ravichandran and Donafolgo Soro and Koffi Sagna and Kossi Napo},
      title = {Role of [Cu]/[In] Molar Ratio in Controlling Structural, Morphological and Optical Properties of Sprayed CuInS2 Thin Films},
      journal = {Advances in Materials},
      volume = {7},
      number = {4},
      pages = {111-117},
      doi = {10.11648/j.am.20180704.13},
      url = {https://doi.org/10.11648/j.am.20180704.13},
      eprint = {https://download.sciencepg.com/pdf/10.11648.j.am.20180704.13},
      abstract = {CuInS2 thin films were deposited by chemical spray pyrolysis from aqueous solutions containing CuCl2, InCl. and thiourea at substrate temperature of 300°C and annealed at 500°C in air. [Cu]/[In] molar ratio was varied from 0.8 to 1.4 in precursor solution. The influence of [Cu]/[In] molar ratio on structural, morphological and optical properties of CuInS2 thin films was investigated. X-ray diffraction analysis shows that all the films have chalcopyrite structure with the preferential orientation along (112) plane. CuInS2 films with indium excess have poor crystallinity and consist of large quantity of small particles while copper-rich films exhibit good crystallinity with large grains. The best film crystallinity is obtained for [Cu]/[In] = 1.2. The scanning electron microscopy and atomic force microscopy images indicated that [Cu]/[In] molar ratio has a strong influence on the microstructure and surface morphology of the films. It was observed that films obtained with [Cu]/[In] ratio of 0.8 are porous. But films surface became gradually dense with increase in [Cu]/[In] molar ratio. As consequence films roughness decreased from 236.12 nm to 110.30 nm. Optical analysis shows that all the films have good absorbance in the visible. The optical absorbance of films is found to increase with increase in [Cu]/[In] molar ratio.},
     year = {2018}
    }
    

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  • TY  - JOUR
    T1  - Role of [Cu]/[In] Molar Ratio in Controlling Structural, Morphological and Optical Properties of Sprayed CuInS2 Thin Films
    AU  - Mazabalo Baneto
    AU  - Damgou Mani Kongnine
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    T2  - Advances in Materials
    JF  - Advances in Materials
    JO  - Advances in Materials
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    EP  - 117
    PB  - Science Publishing Group
    SN  - 2327-252X
    UR  - https://doi.org/10.11648/j.am.20180704.13
    AB  - CuInS2 thin films were deposited by chemical spray pyrolysis from aqueous solutions containing CuCl2, InCl. and thiourea at substrate temperature of 300°C and annealed at 500°C in air. [Cu]/[In] molar ratio was varied from 0.8 to 1.4 in precursor solution. The influence of [Cu]/[In] molar ratio on structural, morphological and optical properties of CuInS2 thin films was investigated. X-ray diffraction analysis shows that all the films have chalcopyrite structure with the preferential orientation along (112) plane. CuInS2 films with indium excess have poor crystallinity and consist of large quantity of small particles while copper-rich films exhibit good crystallinity with large grains. The best film crystallinity is obtained for [Cu]/[In] = 1.2. The scanning electron microscopy and atomic force microscopy images indicated that [Cu]/[In] molar ratio has a strong influence on the microstructure and surface morphology of the films. It was observed that films obtained with [Cu]/[In] ratio of 0.8 are porous. But films surface became gradually dense with increase in [Cu]/[In] molar ratio. As consequence films roughness decreased from 236.12 nm to 110.30 nm. Optical analysis shows that all the films have good absorbance in the visible. The optical absorbance of films is found to increase with increase in [Cu]/[In] molar ratio.
    VL  - 7
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