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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/045/0078

    • Keywords

       

      Thin films; chemical bath; cadmium sulphide; structural properties; optical properties; photoluminescence.

    • Abstract

       

      In this work, cadmium sulphide (CdS) thin films are prepared by a simple and inexpensive chemical bath method. The effect of deposition time is investigated. The synthesized film’s properties were characterized by X-ray diffraction (XRD), optical transmittance and photoluminescence. The XRD analysis reveals the formation of CdS with hexagonal or cubic phases. The crystallite size is deduced from the XRD analysis. We noticed that the crystallite size varies linearly as a function of the deposition time. Scanning electron microscopy images indicated that the CdS films are composed of spherical grains and the surfaces of these films become more homogeneous and dense with deposition time increase. The UV–visible transmittance spectra revealed that the films high-visible transmittance ranged between 60 and 80%. Furthermore, a significant increase in the optical bandgap value from 2.17 to 2.32 eV as a function of deposition time is noticed. The photoluminescence spectrum of each CdS film shows three emission peaks located at 537.32 nm (2.3 eV), 568.45 nm (2.18 eV) and 692.72 nm (1.79 eV) at room temperature, which may be attributed, respectively, to the transition from the valence band to the conduction band, excitonic transitions, i.e., DAP pairs recombination and DL-VB or CB-AL emissions. The excitonic transitions are predominantly due to the cadmium interstitials (I$_{Cd}$) or sulphur vacancies (V$_S$) defects present in these CdS films.

    • Author Affiliations

       

      SANA HARIECH1 JAMAL BOUGDIRA2 MOHAMMED BELMAHI2 GHOUTI MEDJAHDI2 MOHAMED SALAH AIDA3 ABDENNOUR ZERTAL1

      1. Laboratory of Innovative Techniques for the Preservation of the Environment, Faculty of Exact Sciences, Frères Mentouri University Constantine 1, 25017 Constantine, Algeria
      2. Jean Lamour Institute, University of Lorraine, Vandoeuvre-Lès-Nancy 54500, France
      3. Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21577, Saudi Arabia

    • Dates

       
      Published
      28 April 2022
      Manuscript received
      31 August 2021
      Accepted
      24 December 2021
      Final version published online
      28 April 2022

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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