Abstract
Electroless deposited cadmium sulphide thin films were iodinated by direct interaction with iodine vapour for various times. The as-grown films were β-CdS, which when iodinated were converted to c-axis oriented α-CdI 2. The microstructure and surface topography of the films at different stages of iodination were studied by X-ray diffraction and scanning electron microscopy. Based on the variation of electrical resistivity with iodination time a mechanism of sulphide to iodide conversion is proposed, taking account of the free energy change in the solid-gas reaction.
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