Nature of Excited States of Ruthenium-Based Solar Cell Dyes in Solution: A Comprehensive Spectroscopic Study

Raphael Horvath, Michael G. Fraser, Charlotte A. Clark, Xue Zhong Sun, Michael W. George, Keith C. Gordon

Research output: Journal PublicationArticlepeer-review

12 Citations (Scopus)

Abstract

The photophysical properties of a number of ruthenium complexes of the general structure [Ru(L1)(L2)(NCS)2], related to the prominent solar cell dye [Ru(dcb)2(NCS)2] (dcb = 4,4′-dicarboxylato-2,2′-bipyridine) are investigated. For L1 = dcb and dmb (dmb = 4,4′-dimethyl-2,2′-bipyridine), several variations of L2 show very little difference in the lowest energy absorption peak. Resonance Raman and density functional theory calculations have been used to assign the corresponding transitions as {Ru(NCS)2} → dcb with significant contributions of the NCS ligands. Transient absorption, time-resolved infrared, and transient resonance Raman spectroscopic techniques were used to probe the photophysics of the complexes and relatively short-lived {Ru(NCS)2} → dcb/dpb (dpb = 4,4′-diphenylethenyl-2,2′-bipyridine) excited states were observed with the exception of [Ru(dcb)(dab)(NCS)2] (dab = 4,4′-dianthracenethenyl-2,2′-bipyridine), which showed a long-lived excited state assigned as ligand centered charge separated.

Original languageEnglish
Pages (from-to)11697-11708
Number of pages12
JournalInorganic Chemistry
Volume54
Issue number24
DOIs
Publication statusPublished - 21 Dec 2015

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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