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Achieving over 16% efficiency for single-junction organic solar cells

  • Baobing Fan
  • Difei Zhang
  • Meijing Li
  • Wenkai Zhong
  • Zhaomiyi Zeng
  • Lei YingEmail author
  • Fei HuangEmail author
  • Yong Cao
Articles
  • 68 Downloads

Abstract

To achieve high photovoltaic performance of bulk hetero-junction organic solar cells (OSCs), a range of critical factors including absorption profiles, energy level alignment, charge carrier mobility and miscibility of donor and acceptor materials should be carefully considered. For electron-donating materials, the deep highest occupied molecular orbital (HOMO) energy level that is beneficial for high open-circuit voltage is much appreciated. However, a new issue in charge transfer emerges when matching such a donor with an acceptor that has a shallower HOMO energy level. More to this point, the chemical strategies used to enhance the absorption coefficient of acceptors may lead to increased molecular crystallinity, and thus result in less controllable phase-separation of photoactive layer. Therefore, to realize balanced photovoltaic parameters, the donor-acceptor combinations should simultaneously address the absorption spectra, energy levels, and film morphologies. Here, we selected two non-fullerene acceptors, namely BTPT-4F and BTPTT-4F, to match with a wide-bandgap polymer donor P2F-EHp consisting of an imidefunctionalized benzotriazole moiety, as these materials presented complementary absorption and well-matched energy levels. By delicately optimizing the blend film morphology, we demonstrated an unprecedented power conversion efficiency of over 16% for the device based on P2F-EHp:BTPTT-4F, suggesting the great promise of materials matching toward high-performance OSCs.

Keywords

organic solar cells wide bandgap polymer non-fullerene acceptor high performance 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (91633301, 51521002, 21822505, 21520102006).

Supplementary material

11426_2019_9457_MOESM1_ESM.pdf (651 kb)
Supporting Information

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Copyright information

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

Authors and Affiliations

  • Baobing Fan
    • 1
  • Difei Zhang
    • 1
  • Meijing Li
    • 1
  • Wenkai Zhong
    • 1
  • Zhaomiyi Zeng
    • 1
  • Lei Ying
    • 1
    Email author
  • Fei Huang
    • 1
    Email author
  • Yong Cao
    • 1
  1. 1.Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouChina

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