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Effects of the precursor concentration and different annealing ambients on the structural, optical, and electrical properties of nanostructured V2O5 thin films deposited by spray pyrolysis technique

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Abstract

V2O5 thin films were deposited with different precursor concentrations of 0.01, 0.05, and 0.1 M on glass substrates by spray pyrolysis technique, then the optimized films were annealed in different ambients (air, oxygen, and vacuum). The results showed that by increasing the concentration, the films grew along the (001) direction with an orthorhombic structure. Field emission scanning electron microscopy showed that nanorods were formed when depositing 0.05 molar of VCl3. We conclude that with the precursor concentration, the surface nanostructure can be well-controlled. Annealing improved the crystallinity under all ambients, but the best crystallinity was achieved in vacuum. It was revealed that the as-deposited films had the highest transmission, whereas the films annealed in air had the lowest. When annealed in air, the optical band gap decreased from 2.45 to 2.32 eV. The sheet resistance, resistivity, mobility, conductivity, and carrier concentration were measured for all the prepared V2O5 films.

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Acknowledgements

The authors gratefully acknowledge the research department of University of Guilan.

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Authors and Affiliations

  1. Department of Physics, University of Guilan, Rasht, Guilan, 41335, Iran

    Rowshanak Irani & Seyed Mohammad Rozati

  2. Department of Nanophysics, Istituto Italiano di Tecnologia (IIT), 16163, Genoa, Italy

    Szabolcs Beke

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  1. Rowshanak Irani
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  3. Szabolcs Beke
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Correspondence to Seyed Mohammad Rozati.

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Irani, R., Rozati, S.M. & Beke, S. Effects of the precursor concentration and different annealing ambients on the structural, optical, and electrical properties of nanostructured V2O5 thin films deposited by spray pyrolysis technique. Appl. Phys. A 124, 321 (2018). https://doi.org/10.1007/s00339-018-1744-9

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