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Highly Efficient and Thermally Stable Polymer Solar Cells with Dihydronaphthyl-Based [70]Fullerene Bisadduct Derivative as the Acceptor

Authors

  • Xiangyue Meng,

    1. Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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  • Wenqing Zhang,

    1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, The New and Renewable Energy of Beijing Key Laboratory, North China Electric Power University, Beijing 102206, China
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  • Zhan'ao Tan,

    Corresponding author
    1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, The New and Renewable Energy of Beijing Key Laboratory, North China Electric Power University, Beijing 102206, China
    • State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, The New and Renewable Energy of Beijing Key Laboratory, North China Electric Power University, Beijing 102206, China.
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  • Yongfang Li,

    1. Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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  • Yihan Ma,

    1. Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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  • Taishan Wang,

    1. Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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  • Li Jiang,

    1. Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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  • Chunying Shu,

    1. Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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  • Chunru Wang

    Corresponding author
    1. Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    • Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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Abstract

The efficiency of polymer solar cells (PSCs) can be essentially enhanced by improving the performance of electron-acceptor materials, including by increasing the lowest unoccupied molecular orbital (LUMO) level, improving the optical absorption, and tuning the material solubility. Here, a new soluble C70 derivative, dihydronaphthyl-based C70 bisadduct (NC70BA), is synthesized and explored as acceptor in PSCs. The NC70BA has high LUMO energy level that is 0.2 eV higher than [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), and displays broad light absorption in the visible region. Consequently, the PSC based on the blend of poly(3-hexylthiophene) (P3HT) and NC70BA shows a high open-circuit voltage (Voc = 0.83 V) and a high power conversion efficiency (PCE = 5.95%), which are much better than those of the P3HT:PCBM-based device (Voc = 0.60 V; PCE = 3.74%). Moreover, the amorphous nature of NC70BA effectively suppresses the thermally driven crystallization, leading to high thermal stability of the P3HT:NC70BA-based solar cell devices. It is observed that the P3HT:NC70BA-based device retains 80% of its original PCE value against thermal heating at 150 °C over 20 h. The results unambiguously indicate that the NC70BA is a promising acceptor material for practical PSCs.

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