Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
In the field of dye-sensitized solar cells (DSCs), polypyridyl-ruthenium complexes, such as N3 or N719, long time remained the most efficient chromophores and still represent one of the main families of dyes studied for application in such device. However, the best efficiency reported for molecular dyes was achieved using different kinds of chromophores: a metal-free organic dye and a zinc-porphyrin. In association with a cobalt-based redox shuttle, co-sensitization by these two chromophores featuring push-pull effect, yielded record efficiency of 12.3%.[1] The push-pull effect, based on a donor-(π-linker)-acceptor (D-π-A) structural pattern, notoriously affords efficient charge transfer processes from the ground-state to the excited-state of the dye, and also allows reducing electronic recombinations. Hence, the above-mentioned result confirms the advantageous effect of D-π-A structures on DSC performance, besides it also suggests that dyes integrating a transition-metal atom, i. e. zinc-porphyrins, alike Ru-polypyridyl complexes, are strongly favorable to reach high conversion efficiency rates.
Based on our expertise in the synthesis of push-pull organic dyes,[3, 4] we recently designed a new generation of organometallic chromophores, which combine beneficial contributions of a D-π-A structure and of the [Ru(dppe)2] moiety within the π-linker. The metal fragment is already known as an excellent electron relay in nanoscale devices for molecular electronics.[5]
Accordingly, the synthesis of innovative organometallic chromophores showing D-π-[Ru]-π-A structure was successfully achieved. When embedded in DSCs, the new photosensitizers provided conversion efficiencies above 7% and showed broad IPCE profiles.
Those new-generation organometallic dyes therefore represent a promising and versatile approach to the achievement of strong light-harvesting materials and effective photovoltaic properties.
[1] Yella, A.; Lee, H.-W.; Tsao, H. N.; Yi, C.; Chandiran, A. K.; Nazeeruddin, Md. K.; Diau, E. W.-G.; Yeh, C.-Y.; Zakeeruddin, S. M.; Grätzel, M. Science, 2011, 334, 629-634. [2] Olivier, C.; Sauvage, F.; Ducasse, L.; Castet, F.; Grätzel, M.; Toupance, T. ChemSusChem, 2011, 3, 731-736. [3] De Sousa, S.; Olivier, C.; Ducasse, L.; Le Bourdon, G.; Hirsch, L.; Toupance, T. ChemSusChem, 2013, 6, 993-996. [4] Olivier, C.; Costuas, K.; Choua, S.; Maurel, V.; Turek, P.; Saillard, J.-Y.; Touchard, D.; Rigaut, S. J. Am. Chem. Soc., 2010, 132, 5638-5651.
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