Laser-sintered mesoporous TiO2 electrodes for dye-sensitized solar cells |
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Authors: | H Kim RCY Auyeung M Ollinger GP Kushto ZH Kafafi A Piqué |
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Institution: | (1) Naval Research Laboratory, 4555 Overlook Ave., SW, Washington, DC 20375, USA |
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Abstract: | Low-temperature laser sintering has been successfully demonstrated to improve the overall conversion efficiency of dye-sensitized solar cells. Mesoporous TiO2 electrodes were prepared from a colloidal solution of TiO2 nanopowders by a laser direct-write technique and then sintered by a quasi-continuous-wave UV laser (λ=355 nm) for the fabrication of dye-sensitized solar cells. The overall conversion efficiency of the cells based on the laser-sintered TiO2 electrodes was double that of the devices with non-laser-treated TiO2 electrodes. This enhancement is attributed to both the removal of organic additives and the improved inter-nanoparticle electrical contacts induced by the laser-sintering process, which led to an increase in porosity and dye-absorption sites in the TiO2 electrodes. PACS 61.80.Ba; 61.46.+w; 73.22.-f; 84.60.Jt |
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