Ruthenium(II) photosensitizers with electron-rich diarylamino-functionalized 2,2′-bipyridines and their application in dye-sensitized solar cells

Qiwei Wang, Wenjun Wu, Cheuk Lam Ho, Liqin Xue, Zhenyang Lin, Hua Li, Yih Hsing Lo, Wai Yeung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


KGaA, Weinheim. New ruthenium(II) photosensitizers [Ru(dcbpy)(L)(NCS)2] (dcbpy = 4,4′-dicarboxylic acid-2,2′-bipyridine; L = 4,4′-bis{di[4-(N,N′-dimethylamino)phenyl]amino}-2,2′-bipyridine (1), 4,4′-bis[di(4-methoxyphenyl)amino]-2,2′-bipyridine (2), and 4,4′-bis[di(4-tolyl)amino]-2,2′-bipyridine (3)) were prepared and characterized and their application in dye-sensitized solar cells is presented. The optical absorption of these photosensitizers gives a peak at around 540 nm, which is very similar to that of the standard N719. The maximum incident photon-to-current conversion efficiency (IPCE) of 80.6% was obtained for 3, which corresponded to a power conversion efficiency (η) of 5.68% under standard air mass (AM) 1.5 sunlight (versus N719 at 6.76%). Molecular cosensitization of 3 with an organic dye, QS-DPP-I, yielded higher η values up to 6% relative to the cells based on individual photosensitizers, and the corresponding IPCE can reach 93.6% at 549 nm. A preliminary stability test of the devices was also conducted.
Original languageEnglish
Pages (from-to)5322-5330
Number of pages9
JournalEuropean Journal of Inorganic Chemistry
Issue number31
Publication statusPublished - 1 Nov 2014
Externally publishedYes


  • Charge transfer
  • Density functional calculations
  • Ligand effects
  • Ruthenium
  • Sensitizers
  • Solar cells

ASJC Scopus subject areas

  • Inorganic Chemistry

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