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Issue 1, 2013
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Tridentate cobalt complexes as alternative redox couples for high-efficiency dye-sensitized solar cells

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Abstract

Cobalt terpyridine complexes could rival the classical triiodide/iodide redox couple as efficient alternative redox couples for dye-sensitized solar cells. Cobalt bis(2,2′,6′,2′′-terpyridine) complexes enable systematic tuning of the redox potential by variation of the substituents on the terpyridine ligand to optimize the open circuit voltage and the overall photovoltaic performance of the device. A [CoII(Cl-terpy)2](TFSI)2/[CoIII(Cl-terpy)2](TFSI)3 based electrolyte in combination with the Y123 donor–π–acceptor dye yielded a solar to electric power conversion efficiency (PCE) of 8.7% under standard air mass 1.5 global (AM 1.5G) simulated sunlight. Transient photocurrent and photovoltage decay as well as electrochemical impedance spectroscopy was used to rationalize the differences in the photovoltaic parameters of devices with iodide/triiodide and cobalt complex based redox electrolytes.

Graphical abstract: Tridentate cobalt complexes as alternative redox couples for high-efficiency dye-sensitized solar cells

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The article was received on 25 Jul 2012, accepted on 12 Oct 2012 and first published on 15 Oct 2012


Article type: Edge Article
DOI: 10.1039/C2SC21401F
Citation: Chem. Sci., 2013,4, 454-459
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    Tridentate cobalt complexes as alternative redox couples for high-efficiency dye-sensitized solar cells

    K. B. Aribia, T. Moehl, S. M. Zakeeruddin and M. Grätzel, Chem. Sci., 2013, 4, 454
    DOI: 10.1039/C2SC21401F

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