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Time-resolved mid-IR transient absorption spectroscopy is employed to explore the mechanism of improving the performance of dye-sensitized TiO 2 solar cell (DSSC) when a certain amount of H 2 O is added into the electrolyte. The relaxation kinetics of dye-sensitized TiO 2 nanocrystalline film and the corresponding DSSC performance are investigated under different conditions. It is found that the interfacial charge recombination is retarded and electron injection efficiency is increased in the water vapour and in the electrolyte when D 2 O is added. The values of open-circuit photovoltage V oc and the short-circuit photocurrent J sc of the cells are linearly correlated to the product of the two decay time constants. We also observed that V oc well correlates with electron injection efficiency. It provides a preliminary microscopic account for the function of the added water in improving the performance of DSSCs.
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Zhao et al. (2007) studied this question.
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