Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (7): 20230084.doi: 10.7503/cjcu20230084

• Article • Previous Articles     Next Articles

Effects of Different Halogenated End-groups Non-fullerene Acceptors on the Organic Solar Cells

GUO Yuntong1,2, CHEN Zhenyu1,2, GE Ziyi1,2()   

  1. 1.Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices
    2.Ningbo Institute of Materials Technology & Engineering,Chinese Academy of Sciences,Ningbo 315201,China
    3.University of Chinese Academy of Sciences,Beijing 101408,China
  • Received:2023-02-27 Online:2023-07-10 Published:2023-03-21
  • Contact: GE Ziyi E-mail:geziyi@nimte.ac.cn
  • Supported by:
    the National Science Fund for Distinguished Young Scholars, China(21925506)

Abstract:

The end-group halogenation of non-fullerene acceptors(NFAs) is an effective method to fabricate high- performance NFAs organic solar cells(OSCs). Here in, three NFAs, BTP-SSe-F, BTP-SSe-Cl and BTP-SSe-Br, were synthesized. They had different halogenated end groups, IC-2F, IC-2Cl and IC-2Br, respectively. The photophysical properties, electrochemical properties, organic photovoltaic properties and active layer morphology of the three NFAs were tested and analyzed. It was found that fluorinated NFAs had lower energy levels than chlorinated and brominated NFAs. The UV-visible absorption spectra of the three NFAs all showed red-shifting, and the intermolecular force of BTP-SSe-F was stronger. BTP-SSe-F had better electron and hole mobility and more balanced electron and hole mobility. Compared with BTP-SSe-Cl and BTP-SSe-Br, BTP-SSe-F blends had more suitable roughness, better phase separation size and stronger π⁃π packing. When PM6 was used as the donor material, the BTP-SSe-F based optoelectronic devices exhibited the highest power conversion efficiency(PCE=16.53%), the highest current density(JSC=28.17 mA/cm2) and the highest filling factor(FF=74.11%). These results indicate that different halogenated end-group NFAs have great influence on the photoelectric performance of OSCs, and the fluorination of end-group can be very effective in constructing high-performance photovoltaic materials.

Key words: Organic solar cell, Halogenation, Engineering of end-group, Non-fullerene acceptor

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