Small molecular PDI-functionalized 9,9′-bifluorenylidene acceptors for bulk heterojunction organic solar cells

Yong Lu, Bo Wu, Ping Deng, Fu Rong ZHU, Beng ONG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Two novel small molecular non-fullerene acceptors, BF-PDI2 and BF-PDI4, respectively, carrying two and four peripheral perylenediimide moieties, are obtained from appositely functionalized 9,9′-bifluorenylidene and perylenediimide via Suzuki cross-coupling reaction. Owing to their twisted molecular structures, these acceptors possess good solution processability and exhibit relatively weak intermolecular interactions in both solution and the solid state as evidenced from their spectral characteristics. Both display an optical bandgap of 1.94 eV, and their LUMOs as estimated from electrochemical data are -3.83 and -3.92 eV for BF-PDI2 and BF-PDI4, respectively. Both can be utilized as a fullerene acceptor replacement in bulk heterojunction organic solar cells with a polymer donor, PBT7-Th, affording reasonable power conversion efficiencies of 2.46 and 4.43%, respectively.

Original languageEnglish
Pages (from-to)6822-6827
Number of pages6
JournalNew Journal of Chemistry
Volume41
Issue number14
DOIs
Publication statusPublished - 2017

Scopus Subject Areas

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

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