Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 319, Issue -, Pages 62-69Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2016.01.002
Keywords
Dye sensitized solar cells; Al doped TiO2 layer; TiO2/dye/electrolyte interface; Electron transport; Charge recombination
Categories
Funding
- National Natural Science Foundation of China [51472154, 51302164, 51202138, 51202140]
- Natural Science Foundation of Shanghai [13ZR1417100]
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The optimization of charge transfer at the TiO2/dye/electrolyte interface is crucial to the design of dye sensitized solar cells. In this paper, the Al doped TiO2 layers were coated on the mesoporous TiO2 films by a chemical bath deposition process, followed by sintering at 500 degrees C. Its performance as the TiO2/dye/electrolyte interface layer was investigated. The analysis results reveals that the Al doped TiO2 coating can reduce the oxygen vacancy-Ti3+ concentrations in the photoanodes significantly, which is beneficial to suppress the back electron transfer process from TiO2 to electrolyte. Furthermore, the electron mobility of the modified photoanodes was increased. Consequently, the dye sensitized solar cells (DSSC) based on the photoanodes modified by Al-doped TiO2 coating show an improvement on both enhancing the electron transport and suppressing the charge recombination process. The dye sensitized solar cell based on the photoanode modified by 1.0 mol% Al-doped TiO2 layer, shows a power conversion efficiency as high as 7.66%, increasing 9.12% compared with the unmodified reference cell. Finally, our works show a facile and scalable technique to further optimize interfacial charge transfer process in dye sensitized solar cells. (C) 2016 Elsevier B.V. All rights reserved.
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