ITC-2Cl: A Versatile Middle-Bandgap Nonfullerene Acceptor for High-Efficiency Panchromatic Ternary Organic Solar Cells

Cenqi Yan, Tao Liu, Yuzhong Chen, Ruijie Ma, Hua Tang, Gang Li, Tengfei Li, Yiqun Xiao, Tao Yang, Xinhui Lu, Xiaowei Zhan, He Yan, Gang Li (Corresponding Author), Bo Tang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

25 Citations (Scopus)


An effective way to improve the power conversion efficiency of organic solar cells (OSCs) is to use the ternary architecture consisting of a donor, an acceptor, and a third component. Identifying the proper third component for successful ternary OSCs, however, is not an easy task. Herein, it is demonstrated that a middle-bandgap acceptor, ITC-2Cl, functions as a successful third component for several wide-bandgap donor: ultranarrow bandgap acceptor binary systems (PBDB-T-2F: F8IC, PBDB-T-2F: IOIC-2Cl, and PBDB-T-2Cl: IOIC-2Cl). Photovoltaic parameters, including VOC, JSC, fill factor (FF), and power conversion efficiency (PCE), are effectively improved by incorporating ITC-2Cl, which lies in the complementary absorption of ITC-2Cl and host binary system, high-lying LUMO level of ITC-2Cl, and the inhibition of bimolecular recombination. The ternary device based on PBDB-T-2Cl: ITC-2Cl: IOIC-2Cl achieves a champion PCE of 14.75% (certified as 13.78%) with a very low energy loss of 0.48 eV. These results provide critical insight into the ternary strategy and encourage re-evaluation and restudy of the photoactive materials previously reported with moderate performance.

Original languageEnglish
Article number1900377
Pages (from-to)1900377
JournalSolar RRL
Issue number1
Publication statusPublished - 1 Jan 2020


  • energy loss
  • nonfullerene acceptors
  • panchromatic absorption
  • ternary organic solar cells

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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