Conversion of Light into Electricity with Trinuclear Ruthenium Complexes Adsorbed on Textured TiO2 Films
✍ Scribed by Mohammad K. Nazeeruddin; Paul Liska; Jacques Moser; Nick Vlachopoulos; Michael Grätzel
- Book ID
- 102858289
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- German
- Weight
- 973 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
A series of CN-bridged trinuclear Ru complexes of the general structure [RuL2(J-(CN)Ru(CN)L2),1 where L is 2,2'-bipyridine-4,4'-dicarboxylic acid and L is 2,2'-bipyridine (1) 2,2'-bipyridine-4,4'-dicarboxylic acid (2), 4,4-dimethyl-2,2'-bipyridine (3), 4,4'-diphenyL2,2'-bipyridine (4), 1,lO-phenanthroline (5), and bathophenanthrolinedisulfonic acid (6) have been synthesized, and their spectral and electrochemical properties investigated. The two carboxylic functions on the 2,2'-bipyridine ligand L serve as interlocking groups through which the dye is attached at the surface of Ti02 films having a specific surface texture. The role of these interlocking groups is to provide strong electronic coupling between the A * orbital of the 2,2'-bipyridine and the 3d-wave-function manifold of the conduction band of the TiOz, allowing the charge injection to proceed at quantum yields close to 100%. The charge injection and recombination dynamics have been studied with colloidal TiOz, using laser photolysis technique in conjunction with time-resolved optical spectroscopy. Photocurrent action spectra obtained from photo-electrochemical experiments with these trinuclear complexes cover a very broad range in the visible, making them attractive candidates for solar light harvesting. Monochromatic incident photon-to-current conversion efficiencies are strikingly high exceeding 80% in some cases. Performance characteristics of regenerative cells operating with these trinuclear complexes and ethanolic triiodide/iodide redox electrolyte have been investigated. Optimal results were obtained with complex 1 which gave a fill factor of 75 % and a power conversion eficiency of 11.3%at520nm.