Asymmetrically Alkyl-Substituted Wide-Bandgap Nonfullerene Acceptor for Organic Solar Cells

Tian Xia, Chao Li, Hwa Sook Ryu, Xiaobo Sun, Han Young Woo, Yanming Sun

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


An asymmetric wide-bandgap (WBG) nonfullerene acceptor (C6-IDTT-T) is developed by shearing one alkyl side-chain from a symmetrically alkyl-substituted indacenodithieno[3,2-b]thiophene (IDTT) core of the fused-ring electron acceptor 2C6-IDTT-T. These two acceptors both exhibit wide optical bandgaps over 1.8 eV. Investigations on the optical, electrochemical, and active layer morphology are conducted to understand the effect of asymmetric side chains on the electrical and photovoltaic properties. Compared with symmetric 2C6-IDTT-T, asymmetric C6-IDTT-T is found to exhibit redshifted absorption and higher electron mobility. As a result, the C6-IDTT-T blend with a thienothiophene-benzodithiophene copolymer (PTB7-Th) presents higher electron mobility and more balanced charge carrier transport, which leads to an enhanced power conversion efficiency of 8.51% for C6-IDTT-T-based device with a high open-circuit voltage of 1.052 V and a low energy loss of 0.60 eV.

Original languageEnglish
Article number2000061
JournalSolar RRL
Issue number5
Publication statusPublished - 2020 May 1


  • alkyl tailoring strategy
  • asymmetric nonfullerene acceptors
  • efficiency
  • open-circuit voltages
  • wide bandgaps

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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