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A study on CdCl2 activation of CBD-CdS films

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Abstract

Cadmium sulfide (CdS) thin films were deposited using chemical bath deposition (CBD) technique on fluorine-doped tin oxide glass substrates. Cadmium sulfate, thiourea, and ammonium hydroxide were used as Cd source, S source, and the complexing agent, respectively in the reaction bath. The post-deposition CdCl2 activation of chemical bath deposited CdS (CBD-CdS) thin films was done by dip coating in a saturated CdCl2 bath. X-ray diffractograms show the growth of large CdS grains with better crystalline quality over the recrystallization process due to CdCl2 treatment. The development of large clusters was determined to be due to coalescence of smaller clusters. The photoelectrochemical (PEC) cell (CdS/Na2S2O3/Pt) parameters, such as VOC and ISC for CdCl2 activated CBD-CdS thin films were found to be higher compared to untreated CBD-CdS thin films. The improved effective surface area of the film and higher carrier concentration due to grain boundary passivation could be the reason for higher VOC and ISC values found in CdCl2-treated CdS films. Additionally, all the CdCl2-treated CdS films showed an increase in the optical transmittance spectra and bandgap compared to untreated CdS films. Relative energy band edge position of the grown CdS films was found to be adjustable with the CdCl2 treatment time. The best photoactivity was found for the CdS films which were dip-coated for 10 min in CdCl2 solution.

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Acknowledgements

This work is financially supported by the Solar Edu-Training project of the Ministry of Science, Technology, and Research, Sri Lanka. Part of the research was performed at the Sensor Lab, Department of Information Engineering, Università Degli Studi Di Brescia, Brescia, Italy.

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Authors and Affiliations

  1. Research and International Affairs, Sri Lanka Technological Campus, Padukka, Sri Lanka

    W. G. C. Kumarage & N. Gunawardhana

  2. Department of Physics, University of Kelaniya, Kelaniya, Sri Lanka

    R. P. Wijesundera

  3. Postgraduate Institute of Science, University of Peradeniya, Peradeniya, Sri Lanka

    V. A. Seneviratne, C. P. Jayalath & B. S. Dassanayake

  4. Department of Physics, University of Peradeniya, Peradeniya, Sri Lanka

    V. A. Seneviratne, C. P. Jayalath & B. S. Dassanayake

  5. Department of Information Engineering, Università Degli Studi Di Brescia, Brescia, Italy

    N. Kaur & E. Comini

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  1. W. G. C. Kumarage
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Kumarage, W.G.C., Wijesundera, R.P., Seneviratne, V.A. et al. A study on CdCl2 activation of CBD-CdS films. J Mater Sci: Mater Electron 31, 13330–13336 (2020). https://doi.org/10.1007/s10854-020-03886-7

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