Synthesis and DSSC Applications of Ru(II) Complexes Bearing Benzimidazole Type Ligands
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In this study, the synthesis of 7 Ru(II) polypyridine complexes (C1–7) and their characterization by FT-IR, UV–Vis, 1H-NMR and ESI–MS spectroscopic methods have been reported. The use of the complexes as photosensitizers in dye-sensitized solar cells (DSSCs) has been investigated. The photovoltaic characteristics of the fabricated DSSC devices were examined under 1.5 G solar simulation and TiO2 was used as a semiconductor. Absorption and emission spectra of the complexes were examined, cyclic voltammograms of the Ru complexes were performed and HOMO–LUMO energy levels were calculated. Thus, electrochemical properties of the complexes and the energy diagrams, which shows the charge transfer characteristics of the complexes were studied. The alterations in the current–potential characteristics of the Ru sensitizers by modifications in ligands have been investigated. The effects of the substitutions on ligands are evaluated and power conversion efficiency value up to half of the reference sensitizer was obtained by C6 complex.
KeywordsRu(II) complex polypyridine DSSC Ru sensitizers cyclic voltammetry
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