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Science China Chemistry

, Volume 62, Issue 3, pp 370–377 | Cite as

Enhanced intermolecular interactions to improve twisted polymer photovoltaic performance

  • Cunbin An
  • Jingming Xin
  • Lanlan Shi
  • Wei MaEmail author
  • Jianqi Zhang
  • Huifeng Yao
  • Sunsun Li
  • Jianhui HouEmail author
Articles
  • 88 Downloads

Abstract

In polymer solar cells (PSCs), twisted polymer donors usually have low photovoltaic efficiencies due to their poor photoactive layer morphologies. Herein, we successfully improved twisted polymer (PBDT-3T) photovoltaic efficiency by employing C=O groups (PBDT-3TCO) to enhance intermolecular interactions. The maximum power conversion efficiency (PCE) of PBDT-3T is only 1.05%, while the PCE of PBDT-3TCO reaches 11.77% in non-fullerene (NF) PSCs. Both polymers-based PSCs show very similar open-circuit voltages but remarkable differences in their short-circuit currents and fill factors. The single crystals of both functionalized terthiophenes with methyl substituents demonstrate that the terthiophene with C=O units changes molecular pattern by forming intra/inter molecular S⋯O and O⋯H interactions but its molecular planarity does not significantly improve. Our comparative studies show that PBDT-3TCO with C=O units possesses a strong aggregation property and optimal photoactive layer morphology in NF PSCs. This study provides important insight into the design of high-performance twisted polymer donors for NF PSCs.

Keywords

twisted polymer donors carbonyl group intermolecular interaction polymer solar cells 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (51703228, 21835006, 21504066), the Chinese Academy of Sciences (XDB12030200), and the Ministry of Science and Technology (2016YFA0200700). X-ray data was acquired at beamlines 7.3.3 and 11.0.1.2 at the Advanced Light Source, which is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The authors thank Chenhui Zhu at beamline 7.3.3, and Cheng Wang at beamline 11.0.1.2 for assistance with data acquisition.

Supplementary material

11426_2018_9408_MOESM1_ESM.docx (8.1 mb)
Enhanced Intermolecular Interactions to Improve Twisted Polymer Photovoltaic Performance

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Copyright information

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

Authors and Affiliations

  • Cunbin An
    • 1
  • Jingming Xin
    • 2
  • Lanlan Shi
    • 1
  • Wei Ma
    • 2
    Email author
  • Jianqi Zhang
    • 3
  • Huifeng Yao
    • 1
  • Sunsun Li
    • 1
    • 4
  • Jianhui Hou
    • 1
    • 4
    Email author
  1. 1.Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, Institute of ChemistryChinese Academy of SciencesBeijingChina
  2. 2.State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’anChina
  3. 3.Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijingChina
  4. 4.University of Chinese Academy of SciencesBeijingChina

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