Electron transport and recombination in dye-sensitized solar cells with ionic liquid electrolytes

The electron transport and recombination in dye-sensitized TiO 2 solar cells with different electrolytes have been investigated. The electrolytes were based on iodine-doped ionic liquids (diethylmethylsulphonium, dibutylmethylsulphonium or 3-hexyl-1-methylimidazolium iodide) or an organic solvent (3...

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Bibliographic Details
Published in:Journal of Electroanalytical Chemistry 2006, Vol.586 (1), p.56-61
Main Authors: Paulsson, Heléne, Kloo, Lars, Hagfeldt, Anders, Boschloo, Gerrit
Format: Article
Language:English
Subjects:
Applied sciences
Chemistry
diffusion
Dye sensitization
efficiency
Electrolyte
Electron transport
Energy
Exact sciences and technology
Inorganic chemistry
Ionic liquid
Kemi
molten
nanoporous tio2
Natural energy
NATURAL SCIENCES
NATURVETENSKAP
Oorganisk kemi
Photovoltaic conversion
salts
Solar cell
Solar cells. Photoelectrochemical cells
Solar energy
TiO 2
TiO2
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Summary:The electron transport and recombination in dye-sensitized TiO 2 solar cells with different electrolytes have been investigated. The electrolytes were based on iodine-doped ionic liquids (diethylmethylsulphonium, dibutylmethylsulphonium or 3-hexyl-1-methylimidazolium iodide) or an organic solvent (3-methoxypropionitrile with LiI, I 2 and 1-methylbenzimidazole). The most viscous electrolytes showed a clear limitation in photocurrent, which can be attributed to a low diffusion coefficient for the triiodide that transports positive charge to the counter electrode. No essential difference was found in the electron transport properties of the solar cells, which appear to be dominated by the properties of the nanostructured TiO 2 film. The intensity-modulated photocurrent response was strongly affected by current saturation. This is proposed being caused by recombination processes. The electron lifetime is depending on the type of cation used in the ionic liquid, where bulky, less absorptive cations seem to give longer lifetimes.
ISSN:1572-6657
0022-0728
1873-2569
1873-2569
DOI:10.1016/j.jelechem.2005.09.011