Dye Dependent Regeneration Dynamics in Dye Sensitized Nanocrystalline Solar Cells: Evidence for the Formation of a Ruthenium Bipyridyl Cation/Iodide Intermediate
作者： John N. Clifford , Emilio Palomares , Md. K. Nazeeruddin , M. Grätzel , James R. Durrant
DOI: 10.1021/JP067458T
关键词: Redox 、 Chemistry 、 Electrolyte 、 Iodide 、 Ultrafast laser spectroscopy 、 Photoelectrochemical cell 、 Ruthenium 、 Adsorption 、 Photochemistry 、 Kinetics 、 Inorganic chemistry
摘要: We report a transient absorption study of the kinetics re-reduction ruthenium bipyridyl dye cations adsorbed to nanocrystalline TiO2 films by iodide ions, employing series RuII(dcbpy)2X dyes, where dcpby ) 4,4′-dicarboxy-2,2′-bipyridyl and X (NCS)2, (CN)2, DTC (diethyldithiocarbamate), Cl2. The data indicate that this (or ‘regeneration’) reaction proceeds via (dye+-iodide) intermediate complex formed photogenerated with one ion. subsequent second ion, forming I2-, is shown be kinetically thermodynamically limiting step in overall regeneration reaction. implications scheme for function sensitized photoelectrochemical cells are discussed, considering particular high photovoltaic efficiencies obtained such devices senstiser dyes combination iodide/tri-iodide based redox electrolytes.
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