Effect of Core Size on Performance of Fused-Ring Electron Acceptors

Shuixing Dai, Yiqun Xiao, Peiyao Xue, Jeromy James Rech, Kuan Liu, Zeyuan Li, Xinhui Lu, Wei You, Xiaowei Zhan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

74 Citations (Scopus)

Abstract

We report 4 fused-ring electron acceptors (FREAs) with the same end-groups and side-chains but different cores, whose sizes range from 5 to 11 fused rings. The core size has considerable effects on the electronic, optical, charge transport, morphological, and photovoltaic properties of the FREAs. Extending the core size leads to red-shift of absorption spectra, upshift of the energy levels, and enhancement of molecular packing and electron mobility. From 5 to 9 fused rings, the core size extension can simultaneously enhance open-circuit voltage (VOC), short-circuit current density (JSC), and fill factor (FF) of organic solar cells (OSCs). The best efficiency of the binary-blend devices increases from 5.6 to 11.7%, while the best efficiency of the ternary-blend devices increases from 6.3 to 12.6% as the acceptor core size extends.

Original languageEnglish
Pages (from-to)5390-5396
Number of pages7
JournalChemistry of Materials
Volume30
Issue number15
DOIs
Publication statusPublished - 14 Aug 2018

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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