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Efficient Electron Transfer and Sensitizer Regeneration in Stable π-Extended Tetrathiafulvalene-Sensitized Solar Cells

Abstract : The development of metal-free organic sensitizers is a key issue in dye-sensitized solar cell research. We report successful photovoltaic conversion with a new class of stable tetrathiafulvalene derivatives, showing surprising electrochemical and kinetic properties. With time-resolved spectroscopy we could observe highly efficient regeneration of the photo-oxidized tetrathiafulvalene sensitizers, which were attached to a mesoporous TiO2 film, by a redox mediator in the pores (iodide/tri-iodide), even though the measured driving force for regeneration was only about 150 mV. This important proof-of-concept shows that sensitizers with a small driving force, i.e. the oxidation potential is separated from the redox potenial of mediator by as little as 150 mV, can operate functionally in dye-sensitized solar cells and eventually aid to reduce photovoltage losses due to poor energetic alignment of the materials
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01089797
Contributor : Pierre-Antoine Bouit <>
Submitted on : Thursday, March 16, 2017 - 9:24:48 AM
Last modification on : Saturday, July 11, 2020 - 3:14:19 AM
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Sophie Wenger, Pierre-Antoine Bouit, Qianli Chen, Joël Teuscher, Davide Di Censo, et al.. Efficient Electron Transfer and Sensitizer Regeneration in Stable π-Extended Tetrathiafulvalene-Sensitized Solar Cells. Journal of the American Chemical Society, American Chemical Society, 2010, 132 (14), pp.5164-5169. ⟨10.1021/ja909291h⟩. ⟨hal-01089797⟩

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