title: 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.
authors: Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan 10608, ROC.
authors: Huei-Siou
authors: HS
authors: Chen
authors: Wei-Chun
authors: WC
authors: Chang
authors: Chaochin
authors: C
authors: Su
authors: Ting-Yu
authors: TY
authors: Li
authors: Nai-Mu
authors: NM
authors: Hsu
authors: Yogesh S
authors: YS
authors: Tingare
authors: Chung-Yen
authors: CY
authors: Li
authors: Jun-Han
authors: JH
authors: Shie
authors: Wen-Ren
authors: WR
authors: Li