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Effects of Cu doping on the structural, photoluminescence and impedance spectroscopy of CoS2 thin films

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Abstract

Copper-doped cobalt sulfide (CuxCo1−xS2: x = 0–0.1) nanocrystalline thin films were deposited on glass substrates using successive ionic layer adsorption and reaction (SILAR) technique. The influence Cu element concentration on nanostructural, morphological, photoluminescence and impedance properties of CuxCo1−xS2 thin films were examined by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), electron dispersive X-ray (EDX) photoluminescence (PL) and impedance spectroscopy. XRD results revealed that all prepared films consist of pure cubic phase of CoS2 pyrites structure and were well crystallized with the preferentially oriented along (200) plane. Cu doping resulted in a significant increase in the crystallinity of the films and a noticeably alteration in crystallite size. FESEM images revealed that the deposited thin film having spherical grain distribution and the grain sizes decreased from 56 to 34 nm with increasing Cu doping level. The EDX analysis confirmed the stoichiometry of prepared thin films. Photoluminescence (PL) spectra display the broad emission bands centered at 411 with a hump at 417 nm, due to the intrinsic defects. From the impedance spectroscopy analysis, we examined the equivalent circuit and frequency-dependent relaxation phenomenon in dielectric dipoles, loss of electrical energy and AC conductivity of the pure and Cu-doped thin films. Finally, all properties have been discussed, as an impartial of the research work, in terms of the Cu doping content.

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Acknowledgements

The authors extend their sincere appreciation to researchers supporting project number (RSP-2020/130), King Saud University, Riyadh, Saudi Arabia for funding this research.

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Authors and Affiliations

  1. Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia

    Syed Mansoor Ali, M. S. AlGarawi & S. S. AlGamdi

  2. King Abdullah Institute for Nanotechnology, King Saud University, Riyadh, 11451, Saudi Arabia

    M. A. Majeed Khan

  3. Electrical Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia

    Tauriq Uzzaman

  4. Engineering Research Institute, Ulster University, Jordanstown, Newtownabbey, BT37 0QB, Co. Antrim, UK

    Khalid Saeed

  5. Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia

    Jahangeer Ahmed

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  1. Syed Mansoor Ali
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  3. S. S. AlGamdi
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  4. M. A. Majeed Khan
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Contributions

Conceptualization, SMA and SSA; methodology, MSA and SMA; analysis, KS and TU; investigation, SMA and TU; writing-original draft preparation, SMA and MAMK; revision and editing, SMA and JA.

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Correspondence to Syed Mansoor Ali.

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Ali, S.M., AlGarawi, M.S., AlGamdi, S.S. et al. Effects of Cu doping on the structural, photoluminescence and impedance spectroscopy of CoS2 thin films. J Mater Sci: Mater Electron 32, 3948–3957 (2021). https://doi.org/10.1007/s10854-020-05136-2

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  • DOI: https://doi.org/10.1007/s10854-020-05136-2

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