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Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, Ulm, Germany
; Fax: +49 (0)731 50 22840
Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Swiss Federal Institute of Technology, Lausanne, Switzerland
; Fax: +41 (0)21 693 61 00
J. Mater. Chem., 2011,21, 3726-3734
02 Nov 2010,
13 Dec 2010
First published online
31 Jan 2011
The synthesis of new 1,2,3-triazolyl-pyridine ligands via “click-chemistry” and their corresponding Ru(L)(2,2′-bipyridyl-4,4′-dicarboxylic acid)(NCS)2 complexes (L = 1,2,3-triazolyl-pyridine) are presented. The complexes have been photophysically and electrochemically characterized and have been used as sensitizers in dye-sensitized solar cells (DSSC). In DSSCs with an acetonitrile-based electrolyte the cells comprising of Ru(2-(1-(4-hexylphenyl)-1H-1,2,3-triazol-4-yl)pyridine)(2,2′-bipyridyl-4,4′-dicarboxylic acid)(NCS)2 TBA salt1 showed an overall power conversion efficiency of 7.8% under full sunlight intensity, and Ru(2-(4-(4-hexylphenyl)-1H-1,2,3-triazol-1-yl)pyridine)(2,2′-bipyridyl-4,4′-dicarboxylic acid)(NCS)2 TBA salt2 an efficiency of 4.7%. Transient photovoltage and photocurrent decay measurements showed an enhanced performance for dye1 due to faster electron transport into the TiO2 film and lower recombination rate in comparison to dye2 sensitized devices. Additionally, solid-state devices were prepared with 2 μm thick TiO2 films using spiro-OMeTAD as a hole-transport material. The solid-state dye-sensitized solar cells showed power conversion efficiencies of 1.92% and 0.38% for sensitizer 1 and 2, respectively.
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Journal of Materials Chemistry
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