Journal
INORGANIC CHEMISTRY
Volume 53, Issue 3, Pages 1637-1645Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic402701v
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Funding
- Fonds der Chemischen Industrie
- Carl Zeiss foundation
- Canadian Natural Science and Engineering Research Council
- Canadian Foundation for Innovation
- Alberta Ingenuity
- Alfred P. Sloan Foundation
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A series of bis(tridentate) ruthenium(II) complexes featuring new anionic 1,2,3-triazolate-based tridentate ligands and 2,2':6',2 ''-terpyridine is presented. For a complex equipped with carboxy anchoring groups, the performance in a dye-sensitized solar cell is evaluated. The title complexes are readily synthesized and can be decorated with alkyl chains utilizing azide-alkyne cycloaddition methods, in order to improve the device stability and allow the use of alternative electrolytes. On account of the strong electron donation from the 1,2,3-triazolates, the complexes exhibit a broad metal-to-ligand charge-transfer absorption (up to 700 nm), leading to an electron transfer toward the anchoring ligand. The lifetimes of the charge-separated excited states are in the range of 50 to 80 ns. In addition, the ground- and excited-state redox potentials are appropriate for the application in dye-sensitized solar cells, as demonstrated by power conversion efficiencies of up to 4.9% (vs 6.1% for N749).
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