A cobalt complex redox shuttle for dye-sensitized solar cells with high open-circuit potentials

Dye-sensitized solar cells are a promising alternative to traditional inorganic semiconductor-based solar cells. Here we report an open-circuit voltage of over 1,000 mV in mesoscopic dye-sensitized solar cells incorporating a molecularly engineered cobalt complex as redox mediator. Cobalt complexes...

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Veröffentlicht in:Nature communications 2012-01, Vol.3 (1), p.631-631, Article 631
Hauptverfasser: Yum, Jun-Ho, Baranoff, Etienne, Kessler, Florian, Moehl, Thomas, Ahmad, Shahzada, Bessho, Takeru, Marchioro, Arianna, Ghadiri, Elham, Moser, Jacques-E., Yi, Chenyi, Nazeeruddin, Md. K., Grätzel, Michael
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Sprache:eng
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Zusammenfassung:Dye-sensitized solar cells are a promising alternative to traditional inorganic semiconductor-based solar cells. Here we report an open-circuit voltage of over 1,000 mV in mesoscopic dye-sensitized solar cells incorporating a molecularly engineered cobalt complex as redox mediator. Cobalt complexes have negligible absorption in the visible region of the solar spectrum, and their redox properties can be tuned in a controlled fashion by selecting suitable donor/acceptor substituents on the ligand. This approach offers an attractive alternate to the traditional I 3 − /I − redox shuttle used in dye-sensitized solar cells. A cobalt complex using tridendate ligands [Co(bpy-pz) 2 ] 3+/2+ (PF 6 ) 3/2 as redox mediator in combination with a cyclopentadithiophene-bridged donor-acceptor dye (Y123), adsorbed on TiO 2 , yielded a power conversion efficiency of over 10% at 100 mW cm −2 . This result indicates that the molecularly engineered cobalt redox shuttle is a legitimate alternative to the commonly used I 3 − /I − redox shuttle. Dye-sensitized solar cells are a promising alternative to traditional inorganic semiconductor-based solar cells. Yum et al . use a molecularly engineered cobalt complex as a redox mediator to achieve an open-circuit voltage of over 1,000 mV in a mesoscopic dye-sensitized solar cell.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms1655