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Effect of Fe-ion implantation doping on structural and optical properties of CdS thin films

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Abstract

We report on effects of Fe implantation doping-induced changes in structural, optical, morphological, and vibrational properties of cadmium sulfide thin films. Films were implanted with 90 keV Fe+ ions at room temperature for a wide range of fluences from 0.1×1016 to 3.6×1016 ions cm−2 (corresponding to 0.38–12.03 at.% of Fe). Glancing angle X-ray diffraction analysis revealed that the implanted Fe atoms tend to supersaturate by occupying the substitutional cationic sites rather than forming metallic clusters or secondary phase precipitates. In addition, Fe doping does not lead to any structural phase transformation although it induces structural disorder and lattice contraction. Optical absorption studies show a reduction in the optical band gap from 2.39 to 2.17 eV with increasing Fe concentration. This is attributed to disorder-induced band tailing in semiconductors and ion-beam-induced grain growth. The strain associated with a lattice contraction is deduced from micro-Raman scattering measurements and is found that size and shape fluctuations of grains, at higher fluences, give rise to inhomogeneity in strain.

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Authors and Affiliations

  1. Institute of Physics, Sachivalaya Marg, Bhubaneswar, 751 005, India

    S. Chandramohan, S. N. Sarangi, S. Majumder & T. Som

  2. Institute of Ion Beam Physics and Materials Research, Forschungszentrum Dresden-Rossendorf, 01328, Dresden, Germany

    A. Kanjilal

  3. Department of Physics, Kongunadu Arts & Science College, Coimbatore, 641 029, India

    R. Sathyamoorthy

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  1. S. Chandramohan
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  2. A. Kanjilal
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  3. S. N. Sarangi
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Correspondence to T. Som.

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Chandramohan, S., Kanjilal, A., Sarangi, S.N. et al. Effect of Fe-ion implantation doping on structural and optical properties of CdS thin films. Appl. Phys. A 99, 837–842 (2010). https://doi.org/10.1007/s00339-010-5598-z

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  • DOI: https://doi.org/10.1007/s00339-010-5598-z

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