Doping a TiO2 Photoanode with Nb5+ to Enhance Transparency and Charge Collection Efficiency in Dye-Sensitized Solar Cells

The optoelectronic properties of our benchmark nanocrystalline anatase TiO2 photoanode were modified by means of aliovalent doping with Nb5+. Even for a low doping level, the charge collection efficiency can be noticeably improved as a result of a higher electron lifetime when using the heteroleptic Ru(+II) C101 dye. Particularly of interest, while this was only possible by adding additives in the electrolyte, the doping concentration allows tuning of the energetic of the trap state distribution; parameter particularly crucial for the injection rate and charge collection efficiency. This improvement brings the power conversion efficiency of a 7 μm thick transparent photoanode to 8.7% while intensifying the electrode’s transparency.


Published in:
The Journal of Physical Chemistry C, 114, 37, 15849–15856
Year:
2010
Publisher:
American Chemical Society
ISSN:
1932-7455
Keywords:
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 Record created 2010-09-03, last modified 2018-03-17

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