Thieno[3,4-b]thiophene-based organic dyes for dye-sensitized solar cells

Yung Chung Chen, Hsien Hsin Chou, Ming Chih Tsai, Sheng Yu Chen, Jiann T. Lin*, Ching Fa Yao, Kellen Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


New dipolar sensitizers containing an ethyl thieno[3,4-b]thiophene-2- carboxylate (ETTC) entity in the conjugated spacer have been synthesized in two isomeric forms. These compounds were used as the sensitizers of n-type dye-sensitized solar cells (DSSCs). The best conversion efficiency (5.31 %) reaches approximately 70 % of the N719-based (7.41 %) DSSC fabricated and measured under similar conditions. The ETTC-containing compounds exhibit a bathochromic shift of the absorption compared to their thiophene congeners due to the quinoid effect, however, charge-trapping at the ester group of ETTC was found to jeopardize the electron injection and lower the cell efficiency. Charge trapping is alleviated as the ester group of ETTC is replaced with a hydrogen atom, as evidenced from the theoretical computation.

Original languageEnglish
Pages (from-to)5430-5437
Number of pages8
JournalChemistry - A European Journal
Issue number17
Publication statusPublished - 2012 Apr 23


  • dye-sensitized solar cells
  • electron transfer
  • metal-free sensitizers
  • quantum chemistry
  • quinoids

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Organic Chemistry


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