Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (7): 20230147.doi: 10.7503/cjcu20230147

• Article • Previous Articles     Next Articles

Understanding the Mixing Phase Structure in Multi-length-scale Morphology to Arrest High-performance Photovoltaic Devices

ZHANG Ming1, ZHONG Wenkai1, QIAN Shiyun1, LYU Bosai2, ZHOU Guanqing1, XUE Xiaonan1, ZHOU Zichun1, SHI Zhiwen2, ZHU Lei1(), ZHANG Yongming1,3, LIU Feng1,3()   

  1. 1.School of Chemistry and Chemical Engineering,Frontiers Science Center for Transformative Molecules,In?situ Center for Physical Science,Center of Hydrogen Science
    2.Key Laboratory of Artificial Structures and Quantum Control,Ministry of Education,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China
    3.State Key Laboratory of Fluorinated Functional Membrane Materials,Dongyue Future Hydrogen Energy Materials Company,Zibo 256401,China
  • Received:2023-03-29 Online:2023-07-10 Published:2023-05-18
  • Contact: ZHU Lei, LIU Feng E-mail:zhulei1130@outlook.com;fengliu82@sjtu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(51973110);the China Postdoctoral Science Foundation(2022M722072)

Abstract:

The properties of the mixing phase are investigated in detail by introducing PC71BM into two typical organic photovoltaic blends J51∶N2200 and PM6∶Y6. It is found that the process of exciton dissociation and carrier transport in the mixing zone play a key role in determining the power conversion efficiency. In J51∶N2200∶PC71BM blend, the aggregation of PC71BM in the mixing zone brings in energetic barrier to inhibit the hole transfer process. In the meanwhile, the enlarged intervals in-between the double fibril network limit the effective diffusion of the split electrons and holes in the mixing zone, leading to large recombination and energy loss. While in PM6∶Y6∶PC71BM blend, the introduced PC71BM could homogeneously distribute in the amorphous zone, mixing well with PM6 and Y6 molecules. Meanwhile, the addition of PC71BM does not perturb the hole transfer from Y6 to PM6. Such a morphology is advantageous where electrons and holes generated at abundant donor/acceptor interface could diffuse out rapidly, and transport in the crystalline pathway towards the corresponding electrodes. Such results reveal the importance of manipulating the mixing phase structure in the multi-length-scale morphology, of high demand towards 20% efficiency in the next episode organic solar cell(OSC) development.

Key words: Mixing phase, Multi-length-scale morphology, Organic photovoltaics, Power conversion efficiency

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