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Investigation of precursors concentration in spray solution on the optoelectronic properties of CuInSe2 thin films deposited by spray pyrolysis method

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Abstract

Copper indium selenide CuInSe2(CISe) thin films were deposited by chemical spray pyrolysis (CSP) method of CuInS2(CIS) and subsequent selenization process. To study the effects of solution concentration, we prepared different precursors solution of CIS including different amount of indium salts from 0.025 to 0.100 M with In/Cu 1.25 and S/In 4. These results propose that solution concentration is critical for inflecting the morphological, optical, electrical, and electrochemical characteristics of solution-processed CISe films and device performance. The studied morphological properties of deposited samples were homogenous, crack-free with large grains in indium salt concentrations more than 0.075 M. The deposited film thickness depends on the spray precursor concentration and increases for higher concentration. In addition with increasing of indium precursor concentration from 0.025 to 0.100 M in spray solution, the optical bandgap of deposited film decreases from 1.40 to 1.35 eV. Also the films mobility and carrier density were notably influenced by any change in the solution concentration. Electrical and electrochemical properties showed a decrease in carrier density from ~ 1020 to ~ 1017 cm−3 and the increase in mobility of order ~ 10–7 to ~ 10–2 cm2/V s, respectively, for 0.025 M, 0.100 M CISe films. All films exhibited p-type conductivity owing to different concentrations. However, it seems that the concentration of the ideal solution is 0.100 molars.

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Acknowledgements

The authors gratefully acknowledge the support of this work by the Research Council and the Center of Excellence for Nanostructures of the Sharif University of Technology, Tehran.

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Authors and Affiliations

  1. Department of Laser and Photonics, University of Kashan, Kashan, POBOX 873175-3153, Iran

    Maryam Hashemi & Seyed Mohammad Bagher Ghorashi

  2. Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, Karaj, POBOX 31787-316, Iran

    Fariba Tajabadi

  3. Department of Physics, Sharif University of Technology, Tehran, POBOX 11155-9161, Iran

    Nima Taghavinia

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  1. Maryam Hashemi
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Hashemi, M., Ghorashi, S.M.B., Tajabadi, F. et al. Investigation of precursors concentration in spray solution on the optoelectronic properties of CuInSe2 thin films deposited by spray pyrolysis method. J Mater Sci: Mater Electron 32, 25748–25757 (2021). https://doi.org/10.1007/s10854-020-04570-6

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