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

作者：Hervé Nusbaumer, Shaik Mohammed Zakeeruddin, Jacques‐E. Moser, Michaël Grätzel · 发表于：Chemistry - A European Journal · 年份：2003 · DOI：10.1002/chem.200204577 · 被引用次数：318 · 研究领域：TiO2 Photocatalysis and Solar Cells、Advanced Nanomaterials in Catalysis、Advanced Photocatalysis Techniques

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)](ClO(4))(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 microm thick nanoporous layer and a 4 microm thick light-scattering layer, sensitized with a hydrophobic ruthenium dye, gave the best results.