Issue 25, 2011

Carbene-based ruthenium photosensitizers

Abstract

A new series of N-heterocyclic carbene (NHC)-pyridine ruthenium complexes incorporating a carbene unit as an ancillary ligand were designed and successfully synthesized by using simple synthetic methods. The photophysical, electrochemical and photovoltaic properties of these NHC-pyridine based ruthenium complexes were investigated. These complexes showed photoelectric conversion efficiencies in the range of 6.43 ∼ 7.24% under the illumination of AM 1.5 (100 mW cm−2). Interestingly, the modifications on the ancillary ligand of these sensitizers by removal of an alkoxyl group and replacement of the octyl chain with a 3,5-difluorobenzyl group showed a 13% increase in the conversion efficiency for the CifPR dye. These results demonstrated that structural modifications on the NHC-pyridine ancillary ligand of ruthenium complexes results in dye-sensitized solar cells exhibiting a comparable cell performance to that obtained using the standard N719 dye.

Graphical abstract: Carbene-based ruthenium photosensitizers

Supplementary files

Article information

Article type
Paper
Submitted
14 Jan 2011
Accepted
28 Mar 2011
First published
19 May 2011

Dalton Trans., 2011,40, 6765-6770

Carbene-based ruthenium photosensitizers

H. Chen, W. Chang, C. Su, T. Li, N. Hsu, Y. S. Tingare, C. Li, J. Shie and W. Li, Dalton Trans., 2011, 40, 6765 DOI: 10.1039/C1DT10072F

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