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

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...

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Veröffentlicht in:Journal of physical chemistry. C 2010-09, Vol.114 (37), p.15849-15856
Hauptverfasser: Chandiran, Aravind Kumar, Sauvage, Frédéric, Casas-Cabanas, Montse, Comte, Pascal, Zakeeruddin, S. M, Graetzel, Michael
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C: Energy Conversion and Storage
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container_end_page 15856
container_issue 37
container_start_page 15849
container_title Journal of physical chemistry. C
container_volume 114
creator Chandiran, Aravind Kumar
Sauvage, Frédéric
Casas-Cabanas, Montse
Comte, Pascal
Zakeeruddin, S. M
Graetzel, Michael
description 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.
doi_str_mv 10.1021/jp106058c
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title Doping a TiO2 Photoanode with Nb5+ to Enhance Transparency and Charge Collection Efficiency in Dye-Sensitized Solar Cells
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