Doping a TiO2 Photoanode with Nb5+ to Enhance Transparency and Charge Collection Efficiency in Dye-Sensitized Solar Cells
Year: 2010
Type: article
Abstract: The optoelectronic properties of our benchmark nanocrystalline anatase TiO 2 photoanode were modified by means of aliovalent doping with Nb 5+ . 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: 10.1021/jp106058c
Institution: École Polytechnique Fédérale de Lausanne
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1997157237