An Alternative Efficient Redox Couple for the Dye‐Sensitized Solar Cell System
- 22 July 2003
- journal article
- research article
- Published by Wiley in Chemistry – A European Journal
- Vol. 9 (16) , 3756-3763
- https://doi.org/10.1002/chem.200204577
Abstract
A series of new cobalt complexes [Co(LLL)2X2] were synthesized and evaluated as redox mediators for dye-sensitized nanocrystalline TiO2 solar cells. The structure of the ligand and the nature of the counterions were found to influence the photovoltaic performance. The one-electron-transfer redox mediator [Co(dbbip)2](ClO4)2 (dbbip = 2,6-bis(1′-butylbenzimidazol-2′-yl)pyridine) performed best among the compounds investigated. Photovoltaic cells incorporating this redox mediator yielded incident photon-to-current conversion efficiencies (IPCE) of up to 80 %. The overall yield of light-to-electric power conversion reached 8 % under simulated AM1.5 sunlight at 100 W m−2 intensity and more than 4 % at 1000 W m−2. Photoelectrodes coated with a 2 μm thick nanoporous layer and a 4 μm thick light-scattering layer, sensitized with a hydrophobic ruthenium dye, gave the best results.Keywords
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