Isoindigo-based copolymers for polymer solar cells with efficiency over 7%

Chun Chih Ho, Chien An Chen, Chih Yu Chang, Seth B. Darling, Wei Fang Su

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)


A series of isoindigo-based low-band-gap copolymers (PnTI) containing an extended thiophene unit in the donor segment of the polymer were synthesized. The results show that the extended thiophene unit with centrosymmetric conformation simultaneously broadens the polymer absorption and enhances the crystallinity and, thus, hole mobility. Consequently, with additional improved solubility, the polymer P6TI exhibits the highest PCE of 7.25% (and a high J sc of 16.24 mA cm -2 ) among isoindigo-based low-band-gap copolymers. This work demonstrates that by simply adjusting the donor segment and with relatively simple synthetic schemes, a material for high-performance and scalable PSCs will become available. This journal is

Original languageEnglish
Pages (from-to)8026-8032
Number of pages7
JournalJournal of Materials Chemistry A
Issue number21
Publication statusPublished - Jun 7 2014
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


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