Abstract
Nanocrystalline lead sulphide thin films were deposited on clean glass substrates by chemical bath deposition technique using lead acetate and thiourea as Pb+2 and S−2 ions source respectively. Films of five different molarities (0.05 M–0.150 M) of same pH value 10.5 were prepared at 318 K. Characterization was carried out using X-ray diffraction (XRD), X-ray fluorescence, scanning electron microscopy, optical absorption and electrical conductivity measurements. Average crystallite size calculated from the XRD spectra using Scherrer’s formula were between 13 and 18 nm. The optical absorption spectra shifted towards the lower wavelength. The band gap energy of 2.13–2.44 eV was determined from the optical absorption spectra. The electrical conductivity measured using two co-planar Aluminium electrodes was found to increase with increase in temperature showing semiconducting nature of the films. The electrical conductivity at room temperature was found to be of the order of 10−4 Ω−1 cm−1.
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Acknowledgments
We express our gratefulness to the Department of instrumentation & USIC, SAIF, Gauhati university, Guwahati and SAIF, NEHU for providing us the XRD and SEM facilities.
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Hussain, A., Begum, A. & Rahman, A. Electrical and optical properties of nanocrystalline lead sulphide thin films prepared by chemical bath deposition. Indian J Phys 86, 697–701 (2012). https://doi.org/10.1007/s12648-012-0130-2
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DOI: https://doi.org/10.1007/s12648-012-0130-2