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An Alternative Efficient Redox Couple for the Dye-Sensitized Solar Cell System

✍ Scribed by Hervé Nusbaumer; Shaik M. Zakeeruddin; Jacques-E. Moser; Michael Grätzel

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
206 KB
Volume
9
Category
Article
ISSN
0947-6539

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✦ Synopsis

Abstract

A series of new cobalt complexes [Co(LLL)~2~X~2~] were synthesized and evaluated as redox mediators for dye‐sensitized nanocrystalline TiO~2~ 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~~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.

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Over the past decade, dye-sensitized solar cells (DSSCs) [1] based on nanocrystalline mesoporous metal oxides (typically TiO 2 ) have been intensively studied and developed as a promising, low-cost alternative to conventional silicon photovoltaic devices. The components of such DSSCs are a dye sensi