Structural phase diagram for ZnS nanocrystalline thin films under swift heavy ion irradiation |
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Authors: | Shiv P. Patel S.A. KhanA.K. Chawla R. ChandraJ.C. Pivin D. KanjilalLokendra Kumar |
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Affiliation: | a Physics Department, University of Allahabad, Allahabad 211002, India b Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India c Nanoscience Laboratory, IIC, Indian Institute of Technology, Roorkee 247667, India d CSNSM, IN2P3-CNRS, Batiment 108, F-91405 Orsay Campus, France |
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Abstract: | The synthesis of nanocrystalline ZnS thin films by pulsed laser deposition and their modification by swift heavy ions are presented. The irradiations with 150 MeV Ni ions at fluences of 1×1011, 1×1012 and 1×1013 ions/cm2 have been used for these studies. Irradiation results in structural phase transformation and bandgap modification of these films are investigated by using X-ray diffraction and UV-visible absorption measurements, respectively. Since stoichiometry changes induced by irradiation can contribute to the modification of these properties, elastic recoil detection analysis has been performed on pristine and 150 MeV Ni ions irradiated ZnS thin films using a 120 MeV Ag ion beam. The stoichiometry of the films has been found to be similar for pristine and ion irradiated samples. A structural phase diagram based on thermal and pressure spikes has been constructed to explain the structural phase transformation. |
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Keywords: | XRD Ion track ERDA Structural transformation Thermal and pressure spikes |
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