Metal-Free Sensitizers with a Perfluorohexyl Side Chain for Dye-Sensitized Solar Cells: Properties Alien to Alkyl Chains

Chia Jung Liang, C. H.Pavan Kumar, Chun Ting Li, Jiann T. Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

New fluorene dyes containing a perfluorohexyl or an n-hexyl side chain in the conjugated spacer (thiophene) were synthesized for application in dye-sensitized solar cells. The perfluoro dyes more effectively suppress the charge recombination than their congeners containing a hexyl chain, which leads to a higher open-circuit voltage (VOC). The more efficient dark current suppression afforded by the perfluorohexyl-containing dyes was also confirmed by electrochemical impedance spectroscopy. A perfluoro-containing dye exhibited the best power conversion efficiency of the synthesized compounds, which was further improved to 6.73 % by the addition of chenodeoxycholic acid (10 mm) as a co-adsorbant. The hydrophobic perfluorohexyl-containing dyes are more resistant to leaching due to the presence of moisture, leading to higher temporal stability of the DSSCs.

Original languageEnglish
Pages (from-to)819-828
Number of pages10
JournalAsian Journal of Organic Chemistry
Volume7
Issue number4
DOIs
Publication statusPublished - 2018 Apr
Externally publishedYes

Keywords

  • cell stability
  • charge recombination
  • dye-sensitized solar cells
  • fluorenes
  • sensitizers

ASJC Scopus subject areas

  • Organic Chemistry

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