Abstract
PbS nanoparticles have been grown in polyvinyl alcohol matrix on glass and mica substrates by chemical bath deposition method at room temperature. The structural investigation of nanocrystalline PbS has been carried out by X-ray diffraction profile analysis using Williamson–Hall and modified Williamson–Hall methods. The values of the crystallite size are found to be within the range from 10 to 17 nm having very high dislocation density of the order of 1017 m−2. The optical band gaps of the films have been determined from optical absorption measurements and found to be within the range from 2.1 to 2.8 eV. The band gap is shifted from infrared to the visible region on the account of quantum confinement in the nanostructured films due to small crystallite size. Such films, with a band gap lying in the visible region, are suitable for use as solar absorbers rather than infrared applications.
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Acknowledgments
The author wishes to thank Prof. B. K. Sarma and Dr. M. P. C. Kalita of Gauhati University, Guwahati, Assam (India), for continuous support, critical reading and useful discussions.
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Choudhury, N. Chemically deposited nanocrystalline PbS: effect of substrates. Indian J Phys 90, 283–287 (2016). https://doi.org/10.1007/s12648-015-0757-x
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DOI: https://doi.org/10.1007/s12648-015-0757-x