Unsymmetrical squaraines incorporating cabazole as a donor for dye-sensitized solar cells

Jheng Ying Li, Tsu Han Lin, Szu Chien Chen, Chun Guey Wu

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3 Scopus citations


Three unsymmetrical squaraines, where the electron-rich thiophene or bithiophene conjugated fragment was used to link unconventionally the squaraine core and carbazole (or methyl) group, were prepared. JYL-SQ1 with thiophene as a donor and indoline-carboxylic acid as an acceptor has λmax of 568 nm which is much longer than the general metal-free organic dyes. Adding a carbazole unit in JYL-SQ1 (forms JYL-SQ2) can red-shift the λmax to 603 nm. However, cabazole is not a strong donor (and indoline-carboxylic acid is a weak acceptor) the LUMO of all three dyes are delocalized majorly on squaraine unit: the excited electrons of dye molecules injecting into TiO 2 are not so efficiency, resulting in low short-circuit current and conversion efficiency. The corresponding DSSC devices have the conversion efficiency of 0.71%, 2.59% and 2.22% for JYL-SQ1, JYL-SQ2 and THL-SQ3, respectively.

Original languageEnglish
Pages (from-to)1337-1344
Number of pages8
JournalJournal of the Chinese Chemical Society
Issue number10
StatePublished - Oct 2012


  • Carbazole
  • Dye-sensitized solar cell
  • Squaraines


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