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Chinese Journal of Polymer Science

, Volume 37, Issue 1, pp 18–27 | Cite as

Perylene Diimide Based Isomeric Conjugated Polymers as Efficient Electron Acceptors for All-polymer Solar Cells

  • Xiao-Cheng Liu
  • Qing-Wu Yin
  • Zhi-Cheng Hu
  • Zhen-Feng Wang
  • Fei Huang
  • Yong Cao
Article

Abstract

We present here a series of perylene diimide (PDI) based isomeric conjugated polymers for the application as efficient electron acceptors in all-polymer solar cells (all-PSCs). By copolymerizing PDI monomers with 1,4-diethynylbenzene (para-linkage) and 1,3- diethynylbenzene (meta-linkage), isomeric PDI based conjugated polymers with parallel and non-parallel PDI units inside backbones were obtained. It was found that para-linked conjugated polymer (PA) showed better solubility, stronger π-π stacking, more favorable blend morphology, and better photovoltaic performance than those of meta-linked conjugated polymers (PM) did. Device based on PTB7-Th:PA (PTB7-Th:poly{4,8-bis[5-(2-ethylhexyl)-thiophen-2-yl]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)- carbonyl]thieno[3,4-b]thiophene-4,6-diyl}) showed significantly enhanced photovoltaic performance than that of PTB7-Th:MA (3.29% versus 0.92%). Moreover, the photovoltaic performance of these polymeric acceptors could be further improved via a terpolymeric strategy. By copolymerizing a small amount of meta-linkages into PA, the optimized terpolymeric acceptors enabled to enhance photovoltaic performance with improved the short-circuit current density (Jsc) and fill factor (FF), resulting in an improved power conversion efficiency (PCE) of 4.03%.

Keywords

Isomeric conjugated polymers All-polymer solar cells Electron acceptors Perylene diimide 

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Notes

Acknowledgments

This work was financially supported by the Ministry of Science and Technology of China (No. 2014CB643501), the National Natural Science Foundation of China (Nos. 21634004 and 51403070), and the Foundation of Guangzhou Science and Technology Project (No. 201707020019). Zhi-Cheng Hu thanks the financial support from China Postdoctoral Science Foundation (No. 2017M622684).

Supplementary material

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Perylene Diimide Based Isomeric Conjugated Polymers as Efficient Electron Acceptors for All-polymer Solar Cells

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Copyright information

© Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xiao-Cheng Liu
    • 1
  • Qing-Wu Yin
    • 1
  • Zhi-Cheng Hu
    • 1
    • 2
  • Zhen-Feng Wang
    • 1
  • Fei Huang
    • 1
    • 2
  • Yong Cao
    • 1
  1. 1.State Key Laboratory of Luminescent Materials and Devices, School of Materials Science and EngineeringSouth China University of TechnologyGuangzhouChina
  2. 2.South China Institute of Collaborative InnovationDongguanChina

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