Abstract
The present paper is focused to investigate suitable method for preparation of lead sulphide quantum dots (PbS QDs) based thin films for optoelectronic applications. To note, PbS QDs based thin films show controlled morphological, optical and electrical properties with variation in experimental parameters including types of substrates, synthesis methods, molar concentration, deposition methods and environmental condition. Hence, in this paper we have chosen two different preparation methods for synthesis of PbS QDs and also fabricate thin films using as-synthesized QDs solution to investigate the effect of preparation methods on the structural, morphological properties of the samples.To prepare PbS QDs through sol–gel method, we have used lead acetate as source material in both cases. However, the assistance for synthesis of QDs have been changed in both cases, i.e., DHLA is used for ligand exchange in sample 1 and SDS-CTAB-EDTA combination is used to synthesize monodispersed size QDs in sample 2. To fabricate thin films, DI water based liquid samples are directly coated on silicon substrate through spin coating. The morphological and optical properties of the as-prepared liquid samples are analyzed through TEM images, FTIR and UV–VIS-NIR spectra. Whereas the structural and optical properties of QDs based thin films are investigated using FE-SEM images, XRD and PL spectra.
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One of the authors acknowledges to the Department of Science and Technology (DST), Government of India for granting funds under TARE scheme for continuing the research work. Authors are also thankful to Prof. B. R. Mehta and his research group, Department of Physics, IIT Delhi for extending their research facility.
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Singh, Y., Singh, S.K. & Hazra, P. Effect of synthesis routes for preparation of lead sulphide quantum dots based thin films by spin coating technique. Opt Quant Electron 54, 862 (2022). https://doi.org/10.1007/s11082-022-04243-0
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DOI: https://doi.org/10.1007/s11082-022-04243-0