• MOHAMED SALAH AIDA

      Articles written in Bulletin of Materials Science

    • Effect of deposition time on chemical bath deposited CdS thin films properties

      SANA HARIECH JAMAL BOUGDIRA MOHAMMED BELMAHI GHOUTI MEDJAHDI MOHAMED SALAH AIDA ABDENNOUR ZERTAL

      More Details Abstract Fulltext PDF

      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.

  • 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
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2022-2023 Indian Academy of Sciences, Bengaluru.