Abstract
We show that a high-efficiency diffraction grating can be embedded into nanoparticulate TiO2 film via imprinting combined with TiCl4 treatment. The grating-embedded film consists of two layers in intimate contact. A thin TiO2 layer was first patterned on a glass substrate by imprinting. The patterned layer was TiCl4-treated with a higher concentration than the over-coated thicker layer, so that it diffracts incident light as a refractive-index grating. Gratings with a period scaled down to 1 µm could be embedded into the film. Diffraction efficiency increased with an increasing grating height and an efficiency over 80% was achieved in the near-ultraviolet and visible range. Dye-sensitized solar cells fabricated using a grating-embedded TiO2 photoanode exhibited much better photovoltaic performance than those without a grating. It was also found that the incorporation of a diffraction grating greatly enhances the photocatalytic activity of nanoparticulate TiO2 film. All these are attributed to improved light harvest.
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Acknowledgements
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (no: NRF-2015R1D1A1A09058787).
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Lee, J., Lee, M. Improved light harvest in diffraction grating-embedded TiO2 nanoparticle film. Appl. Phys. A 123, 737 (2017). https://doi.org/10.1007/s00339-017-1368-5
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DOI: https://doi.org/10.1007/s00339-017-1368-5