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- Title
Strongly Coupled Cyclometalated Ruthenium Triarylamine Chromophores as Sensitizers for DSSCs.
- Authors
Kreitner, Christoph; Mengel, Andreas K. C.; Lee, Tae Kyung; Cho, Woohyung; Char, Kookheon; Kang, Yong Soo; Heinze, Katja
- Abstract
A series of anchor-functionalized cyclometalated bis(tridentate) ruthenium(II) triarylamine hybrids [Ru(dbp-X)(tctpy)]2− [ 2 a]2−-[ 2 c]2− (H3tctpy=2,2′;6′,2′′-terpyridine-4,4′,4′′-tricarboxylic acid; dpbH=1,3-dipyridylbenzene; X=N(4-C6H4OMe)2 ([ 2 a]2−), NPh2 ([ 2 b]2−), N-carbazolyl [ 2 c]2−) was synthesized and characterized. All complexes show broad absorption bands in the range 300-700 nm with a maximum at about 545 nm. Methyl esters [Ru(Me3tctpy)(dpb-X)]+ [ 1 a]+-[ 1 c]+ are oxidized to the strongly coupled mixed-valent species [ 1 a]2+-[ 1 c]2+ and the RuIII(aminium) complexes [ 1 a]3+-[ 1 c]3+ at comparably low oxidation potentials. Theoretical calculations suggest an increasing spin delocalization between the metal center and the triarylamine unit in the order [ 1 a]2+<[ 1 b]2+<[ 1 c]2+. Solar cells were prepared with the saponified complexes [ 2 a]2−-[ 2 c]2− and the reference dye N719 as sensitizers using the I3−/I− couple and [Co(bpy)3]3+/2+ and [Co(ddpd)2]3+/2+ couples as [B(C6F5)4]− salts as electrolytes (bpy=2,2′-bipyridine; ddpd= N, N′-dimethyl- N, N′-dipyridin-2-yl-pyridine-2,6-diamine). Cells with [ 2 c]2− and I3−/I− electrolyte perform similarly to cells with N719. In the presence of cobalt electrolytes, all efficiencies are reduced, yet under these conditions [ 2 c]2− outperforms N719.
- Subjects
RUTHENIUM; SOLAR cell design; DYES &; dyeing; CHROMOPHORES; ELECTROCHEMICAL research
- Publication
Chemistry - A European Journal, 2016, Vol 22, Issue 26, p8915
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201601001