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Ruthenium complexes sensitizers with phenyl-based bipyridine anchoring ligands for efficiently dye-sensitized solar cells

Abstract

Two ruthenium complexes dye sensitizers, Ru(NCS)2 LL', of which L refers to 4,4'-dinonyl-2,2'-bipyridine as well as L' stands for 4,4'-di(m-X-benzoic acid)-2,2'-bipyridine (X = H (RC-73), F (RC-76)), are designed and synthesized to investigate the influence of introducing phenyl-based bipyridine anchoring ligands and the performance of dye-sensitized solar cells based on them. Since the modification of conventional 4,4'-dicarboxylic-2,2'-bipyridyl anchoring ligands by phenyl-based bipyridine units, both RC dyes show superior photophysical and electrochemical properties resulting in excellent performance for devices. Remarkably, with the enhancement of the electron-withdrawing ability of X, RC-76 obtains more satisfactory properties in absorption intensity, the redox potentials, electron transport and dye regeneration, which can be confirmed by UV-vis absorption spectra, cyclic voltammetric measurement, density functional theory calculation and transient absorption spectra. The devices based on RC-76 obtain a short-circuit current density of 17.52 mA cm-2 and a power conversion efficiency of 9.23%. The kinetic study and electrical impedance spectroscopy explain the causes of the more inferior open-circuit voltage of RC dyes than that of standard Z907 dye. RC dyes represented by RC-76 exhibit a good long-term stability and the corresponding solar cells remains over 90% of the initial power conversion efficiency during 1000 h.

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Publication details

The article was received on 05 Jul 2018, accepted on 07 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8TC03288B
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Ruthenium complexes sensitizers with phenyl-based bipyridine anchoring ligands for efficiently dye-sensitized solar cells

    Y. Huang, W. Chen, X. Zhang, R. Ghadari, X. Fang, T. Yu and F. Kong, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC03288B

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