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

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

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 (US)
Pages (from-to)516-524
Number of pages9
JournalDyes and Pigments
Volume96
Issue number2
DOIs
StatePublished - Feb 1 2013

Keywords

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

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    Lai, L. F., Ho, C. L., Chen, Y. C., Wu, W. J., Dai, F. R., Chui, C. H., Huang, S. P., Guo, K. P., Lin, J. T. S., Tian, H., Yang, S. H., & Wong, W. Y. (2013). New bithiazole-functionalized organic photosensitizers for dye-sensitized solar cells. Dyes and Pigments, 96(2), 516-524. https://doi.org/10.1016/j.dyepig.2012.10.002