Design and characterization of heteroleptic ruthenium complexes containing benzimidazole ligands for dye-sensitized solar cells: The effect of fluorine substituents on photovoltaic performance

Wei Kai Huang, Hui Ping Wu, Pi Lun Lin, Yuan-Pern Lee, Wei-Guang Diau*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

We designed heteroleptic ruthenium complexes (RD12-RD15) containing fluoro-substituted benzimidazole ligands for dye-sensitized solar cells (DSSCs). These dyes were synthesized according to a typical one-pot procedure with the corresponding ancillary ligands produced in two simple steps; they were prepared into DSSC devices according to the same conditions of fabrication. The eventual devices show a systematic trend of increasing VOC and decreasing JSC with fluorine atoms of increasing number substituted on the ligand. The charge-extraction results show that upward shifts of the TiO 2 potential occurred when the fluoro-substituted dyes were sensitized on TiO2 with a systematic trend of shift N719 > RD15 (with 5 F) > RD12 (with 2 F) >RD5 (no F); the intensity-modulated photovoltage spectra indicate that those fluoro substituents retard charge recombination with the electron lifetimes (τR) in the order RD15 > RD12 > RD5 > N719, consistent with the variation of VOC for the systems.

Original languageEnglish
Pages (from-to)1830-1835
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume3
Issue number13
DOIs
StatePublished - 5 Jul 2012

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