Terpolymer acceptors based on bithiophene imide for all-polymer solar cells

Weipeng Sun, Junwei Wang, Yongqiang Shi, Ziang Wu, Yumin Tang, Kui Feng, Han Young Woo, Xugang Guo, Fei Bao Zhang

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


In order to improve light absorption and promote n-type performance, random copolymerization strategy was employed to afford a series of random terpolymer acceptors with acceptor1-acceptor2-acceptor3 (A1-A2-A3) type backbone. The polymers were synthesized from distannylated electron-deficient bithiophene imide monomer with various electron-deficient dibrominated co-monomers using the typical palladium-catalyzed Stille coupling condensation polymerization. Compared with their parent polymers, these A1-A2-A3 type terpolymer acceptors, particularly the dihexylthieno[3,4-b]pyrazine based terpolymer PBTP, can exhibit good miscibility, appropriate polymer crystallinity, and improved absorption in the long-wavelength region due to the incorporation of a third strong electron-withdrawing acceptor moiety thieno[3,4-b]pyrazine. Benefitting from the noncovalent S⋯N interactions, PBTP possessed a planar skeleton and achieved the highest power conversion efficiency (PCE) of 7.35% in the polymer series when serving as the acceptor material in all-polymer solar cells. These results indicate that the A1-A2-A3 type terpolymer acceptors should be promising candidates for developing high-performance all-polymer solar cells.

Original languageEnglish
Article number109049
JournalDyes and Pigments
Publication statusPublished - 2021 Feb


  • All-polymer solar cells
  • Bithiophene imide
  • Optical absorption
  • Polymer acceptors
  • Terpolymers

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology


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