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Sulfur vs. tellurium: the heteroatom effects on the nonfullerene acceptors

  • Lei Yang
  • Linqing Qin
  • Yunxiao Xu
  • Huotian Zhang
  • Lei Lv
  • Kepeng Chen
  • Xinyu Sui
  • Yangguang Zhong
  • Yuan Guo
  • Feng GaoEmail author
  • Jianzhang Zhao
  • Yuhao Li
  • Xinfeng LiuEmail author
  • Yuanping YiEmail author
  • Xinhui Lu
  • Aidong Peng
  • Hui HuangEmail author
Articles
  • 30 Downloads

Abstract

The effect of chalcogen heteroatom variation on donor materials has been systematically investigated. However, this effect on acceptors has rarely been explored. Herein, nonfullerene acceptors BFPSP and BFPTP were reported by simply changing the chalcogen atoms from S to Te. The differences between BFPSP and BFPTP in light absorption, energy levels, excited-state lifetimes, energy loss, charge mobilities, morphology, and photovoltaic properties were systematically investigated to understand the heteroatom effects. More importantly, the electroluminescence spectra, external quantum efficiency of photovoltaics and TD-DFT calculations revealed that the triplet excited state (T1) in energy of BFPTP equals to the charge transfer (CT) state in PBDB-T:BFPTP, which allows T1 excitons, generated by intersystem crossing, to split into free charges to contribute to the efficiency. This contribution provides a strategy for tuning the photophysical properties of nonfullerene acceptors and designing high performance triplet materials for OSCs.

heteroatom effects triplet state tellurophene nonfullerene acceptor organic solar cells 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (21774130, 21673054), the National Key Research and Development Program of China (2018FYA 0305800), the Key Research Program of Frontier Sciences, CAS (QYZDB-SSW-JSC046), Key Research Program of the Chinese Academy of Sciences (XDPB08-2), the Strategic Priority Research Program of Chinese Academy of Sciences (XDB28000000, XDB12020200), External Cooperation Programs of Chinese Academy of Sciences (211211KYSB20170014), Innovation Program of Aerospace Science and Technology, China Aerospace Science and Technology Corporation, One Hundred Talents Program of Chinese Academy of Sciences, and University of Chinese Academy of Sciences, the Ministry of Science and Technology (2017YFA0205004, 2016YFA0200700), Beijing Natural Research Foundation (4182076). We also thank Prof. Jianpu Wang, Dr. Qiming Peng, and Zewu Fu for magneto-photocurrent measurements.

Supplementary material

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Lei Yang
    • 1
    • 2
  • Linqing Qin
    • 1
  • Yunxiao Xu
    • 1
  • Huotian Zhang
    • 3
  • Lei Lv
    • 1
  • Kepeng Chen
    • 6
  • Xinyu Sui
    • 4
  • Yangguang Zhong
    • 4
  • Yuan Guo
    • 7
  • Feng Gao
    • 3
    Email author
  • Jianzhang Zhao
    • 6
  • Yuhao Li
    • 8
  • Xinfeng Liu
    • 4
    • 5
    Email author
  • Yuanping Yi
    • 7
    Email author
  • Xinhui Lu
    • 8
  • Aidong Peng
    • 1
  • Hui Huang
    • 1
    Email author
  1. 1.College of Materials Science and Optoelectronic Technology, Center of Materials Science and Optoelectronics Engineering, CAS Center for Excellence in Topological Quantum Computation, CAS Key Laboratory of Vacuum PhysicUniversity of Chinese Academy of SciencesBeijingChina
  2. 2.Department of Chemical EngineeringImperial College LondonLondonUK
  3. 3.Biomolecular and Organic Electronics, Department of Physics, Chemistry and Biology (IFM)Linköping UniversityLinköpingSweden
  4. 4.Division of Nanophotonics, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijingChina
  5. 5.University of Chinese Academy of SciencesBeijingChina
  6. 6.State Key Laboratory of Fine Chemicals, School of Chemical EngineeringDalian University of TechnologyDalianChina
  7. 7.Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of ChemistryChinese Academy of SciencesBeijingChina
  8. 8.Department of PhysicsThe Chinese University of Hong KongShatin, NTHong Kong, China

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