Abstract
Ce-doped ZnO hollow spheres (Ce@ZHSp) with various Ce-contents of 0, 0.25, 0.50 and 1.0 mol% were synthesized via a template-free hydrothermal method. The calcined samples were characterized using XRD, FESEM, TEM, BET–BJH and UV–Vis spectroscopic techniques. The analytical results showed that all the samples possessed a hexagonal wurtzite structure. The crystallite size of Ce@ZHSp decreased with increasing Ce-content. Calcined samples had a hollow sphere morphology with an average diameter range of 4.63–5.16 µm. Diffuse reflectance was increased by adding an appropriate Ce-dopant of 0.25 mol% into the ZnO hollow spheres. The energy-conversion efficiency of a dye-sensitized solar cell was examined under the A.M. 1.5 direct spectrum. These results showed that the highest efficiency was derived from a bilayer photoanode using 0.25 mol% Ce-doped ZnO hollow spheres as a light scattering layer. This finding was related to an increase in the amount of dye adsorption and a photonic reflection effect originating from the relatively larger particle sizes with higher porosity compared to the other samples.
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Acknowledgements
The authors would like to thank Prof. Santi Maensiri and the Advance Materials Physics Laboratory (AMP), School of Physics, Institute of Science, Suranaree University of Technology for the use of their hydrothermal reactor facility. This research was financially supported by Mahasarakham University and the Torey Science Foundation, Japan in 2019.
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Kenyota, N., Maiaugree, W. & Laokul, P. Preparation of Ce-doped ZnO hollow spheres and their application as a light scattering layer in dye-sensitized solar cells. J Mater Sci: Mater Electron 32, 3782–3796 (2021). https://doi.org/10.1007/s10854-020-05122-8
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DOI: https://doi.org/10.1007/s10854-020-05122-8