Novel Fluorous Amphiphilic Heteroleptic Ru-Based Complexes for a Dye-Sensitized Solar Cell: The First Fluorous Bis-ponytailed Amphiphilic Ru Complexes
journal contributionposted on 16.05.2011, 00:00 by Norman Lu, Jia-Sheng Shing, Wen-Han Tu, Ying-Chan Hsu, Jiann T. Lin
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A new series of amphiphilic heteroleptic ruthenium(II) sensitizers with a fluorous bis-ponytailed bipyridine ancillary ligand, [Ru(H2dcbpy)(4,4′-bis(RfCH2OCH2)-2,2′-bpy)(NCS)2] [where Rf = HCF2CF2 (CT4), C3F7 (CT7), and HCF2CF2CF2CF2 (CT8)], have been synthesized and fully characterized by UV/vis, visible emission, NMR, fast atom bombardment mass spectrometry, and cyclic voltammetric studies. Dye-sensitized solar cells (DSCs) based on these dyes exhibit efficiencies comparable with that of the standard cell based on N719. The conversion efficiency of a CT7- or CT8-based DSC is ∼9% higher than that of Z907 with a nonfluorous bis-ponytailed bipyridine ancillary ligand. The fluorous chains were found to increase the dye density on TiO2 and to help to suppress the dye desorption.