New bithiazole-functionalized organic photosensitizers for dye-sensitized solar cells

Lai Fan Lai, Cheuk Lam HO*, Yung Chung Chen, Wen Jun Wu, Feng Rong Dai, Chung Hin CHUI, Shu Ping Huang, Kun Peng Guo, Jiann T.Suen Lin, He Tian, Shi He Yang, Wai Yeung WONG

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

31 Citations (Scopus)


Five bithiazole-based organic dyes D1-D5 containing different electron donor moieties (thiophene, uorene, carbazole, and triarylamine) in the molecular frameworks were synthesized, characterized and applied in dye-sensitized solar cells (DSSCs). The effects of electron-donating moieties of the organic dyes on their photophysical, electrochemical, and photovoltaic properties have been investigated in detail. These dyes exhibit strong charge transfer absorption bands in the visible region. Their redox potential levels were estimated by cyclic voltammetry and found to match well with the charge flow in DSSCs. The combination of broad absorption bands with fairly high extinction coefficients and appropriate redox properties makes these bithiazole-based molecules promising dyes for DSSCs. For solar cell device based on D4, the maximal monochromatic incident photon-to-current conversion efficiency (IPCE) can reach up to 68.5%, with a short-circuit photocurrent density (Jsc) of 9.61 mA cm-2, an open-circuit photovoltage (Voc) of 0.70 V and a fill factor (FF) of 0.70, which results in a power conversion efficiency (PCE) of 4.65% under illumination of an AM 1.5 solar cell simulator.

Original languageEnglish
Pages (from-to)516-524
Number of pages9
JournalDyes and Pigments
Issue number2
Publication statusPublished - Feb 2013

Scopus Subject Areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • Bithiazole
  • Carbazole
  • Dye-sensitized solar cell
  • Organic dye
  • Photosensitizer
  • Synthesis


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