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

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• 作者：Aravind Kumar Chandiran ; Frdric Sauvage ; Montse Casas-Cabanas ; Pascal Comte ; S. M. Zakeeruddin ; Michael Graetzel
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：September 23, 2010
• 年：2010
• 卷：114
• 期：37
• 页码：15849-15856
• 全文大小：383K
• 年卷期：v.114,no.37(September 23, 2010)
• ISSN：1932-7455

文摘

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.