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 |
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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. |
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ISSN: | 2041-1723 2041-1723 |
DOI: | 10.1038/ncomms1655 |