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The effect of WO3/TeO2 molar concentration on the structural, optical, and thermoelectric properties of WO3–TeO2 binary thin films

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Abstract

In this paper, the structural, optical, and thermoelectric properties of WO3–TeO2 binary thin films deposited by spray pyrolysis have been studied. The WO3–TeO2 binary thin films were prepared by changing the molar ratio of WO3/TeO2 in solution with molar ratios (a) WO3 (0.15 M)–TeO2 (0.05 M), (b) WO3 (0.1 M)–TeO2 (0.1 M), and (c) WO3 (0.05 M)–TeO2 (0.15 M). Then, the structural, optical, and thermoelectric properties of the thin films were studied for before and after annealing conditions at T = 500 °C. The X-ray diffraction results showed that the structure of the deposited thin films was pre-amorphous, and after annealing at T = 500 °C, the WO2.92, TeO2, H2Te2O6, and WTe2 phases were formed. The field emission-scanning electron microscopy (FE-SEM) images showed that with annealing, the grains were crystalline in shape and almost uniform. Since the different phases in this composition have different structures, post-annealing FE-SEM images can be seen to have a nearly uniform distribution of polyhedral structures. The UV–Vis spectroscopy results showed that the bandgap of the thin films varies in the range of 2.3–3.94 eV. The bond structure of the nanoparticles has also been studied by FT-IR spectroscopy. Studies of thermoelectric properties (thermal and electrical conductivity) on thin films before and after annealing showed that the Seebeck coefficient for the (c) WO3 (0.05 M)–TeO2 (0.15 M) sample is larger than other thin films, and the majority of carriers are holes. The ZT coefficient for this sample was calculated as 1.0.

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Authors and Affiliations

  1. Department of Physics, Faculty of Basic Sciences, Khatam ol-Anbia (PBU) University, Tehran, Iran

    A. Shirpay

  2. School of Physics, Damghan University, Damghan, Iran

    M. M. Bagheri Mohagheghi

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Shirpay, A., Mohagheghi, M.M.B. The effect of WO3/TeO2 molar concentration on the structural, optical, and thermoelectric properties of WO3–TeO2 binary thin films. J Mater Sci: Mater Electron 32, 1766–1777 (2021). https://doi.org/10.1007/s10854-020-04944-w

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