Abstract
The present study reports on the synthesis of Fe-doped tungsten trioxide (WO3:Fe) thin films using spray-pyrolysis technique. The films were deposited on glass substrates at 350°C and Fe-doping was achieved using granular iron in an acidic medium with \(\frac{{\left[ {{\text{Fe}}} \right]}}{\left[ W \right]}\) = 1, 3 and 5 % at. The films were heat-treated with an extended thermal treatment at 400°C and 500°C for 4 h, in order to allow both crystallization and dopant diffusion into the WO3 matrix. The effect of Fe-doping and heat-treatment on the morphological, structural and optical properties of these films was investigated. The results revealed that Fe-doping has a significant impact on the morphology of the films depending on its concentration. In addition, it was shown that the thermal treatment improves the growth of the crystallites and enhances the roughness of the surface. Grazing incidence X-ray diffraction analysis (GIXRD) confirmed the polycrystalline character of the films with a monoclinic structure (ICDD N° 89-4476, P21/c). The structural parameters were found to be both doping- and heat-treatment-dependent. Energy dispersive spectrometry (EDS) depicted homogeneous doping and confirmed the presence of W, O and Fe. The films display a good optical transmittance over the visible region sensitive to Fe-doping and thermal treatment. Moreover, the films exhibit both direct and indirect electronic transitions, where the energy of the indirect electronic allowed transition shows a redshift in all the samples due to Fe-doping. Therefore, the width of the tail states energy increases inferring the influence of disorder and the introduction of defect states within the band gap region.
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Acknowledgments
The authors which to thank Professor Bouslama M’Hammed, the Director of the Materials Laboratory (ENPO-Oran), for providing access to AFM measurements, and Dr. Mhamed Guezzoul from the same laboratory for his help in these measurements.
Funding
This work was funded by the Directorate-General for Scientific Research and Technological Development, Ministry of Higher Education and Scientific Research (Algeria).
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Ouadah, E., Hamdadou, NE. & Ammari, A. Morphological, Structural and Optical Properties of Fe-Doped WO3 Films Deposited by Spray-Pyrolysis. J. Electron. Mater. 51, 356–369 (2022). https://doi.org/10.1007/s11664-021-09300-0
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DOI: https://doi.org/10.1007/s11664-021-09300-0