Indacenodithieno[3,2-b]thiophene-based broad bandgap polymers for high efficiency polymer solar cells

Yun Xiang Xu, Chu Chen Chueh, Hin Lap Yip, Chih Yu Chang, Po Wei Liang, Jeremy J. Intemann, Wen Chang Chen, Alex K Y Jen

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Two broad bandgap polymers, poly{(indacenodithieno[3,2-b]thiophene)-alt-[2, 5-bis(thiophen-2-yl)thiazolo[5,4-d]thiazole-5,5′-diyl]} PIDTT-TzTz and poly{(indacenodithieno[3,2-b]thiophene)-alt-[2,5-bis(6-octylthieno[3,2-b] thiophen-2-yl)thiazolo[5,4-d]thiazole-5,5′-diyl]} PIDTT-TzTz-TT, were designed and synthesized by copolymerizing the ladder-type indacenodithieno[3,2- b]thiophene (IDTT) donor with a thiazolothiazole (TzTz) acceptor. Both polymers possess moderate hole-mobilities of around ∼10-4 cm2 V-1 s-1. The polymer solar cells (PSCs) using PIDTT-TzTz-PC71BM as the active layer showed good power conversion efficiencies (PCEs as high as 5.53% and 5.90%) in both conventional and inverted devices, without using any solvent additives. These results demonstrate that these broad bandgap PIDTT-TzTz polymers have potential to be used as a front cell for polymer tandem cells.

Original languageEnglish
Pages (from-to)5220-5223
Number of pages4
JournalPolymer Chemistry
Issue number20
Publication statusPublished - Oct 21 2013
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Biomedical Engineering
  • Polymers and Plastics
  • Organic Chemistry


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