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Hyperbranched polymer functionalized flexible perovskite solar cells with mechanical robustness and reduced lead leakage

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  • Zhihao Li

    (Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU)
    Northwestern Polytechnical University
    Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications
    Research & Development Institute of Northwestern Polytechnical University in Shenzhen)

  • Chunmei Jia

    (Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU))

  • Zhi Wan

    (Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU))

  • Jiayi Xue

    (Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU))

  • Junchao Cao

    (Northwestern Polytechnical University
    Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications)

  • Meng Zhang

    (Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU)
    Northwestern Polytechnical University)

  • Can Li

    (Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU)
    Research & Development Institute of Northwestern Polytechnical University in Shenzhen)

  • Jianghua Shen

    (Northwestern Polytechnical University
    Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications)

  • Chao Zhang

    (Northwestern Polytechnical University
    Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications
    Northwestern Polytechnical University)

  • Zhen Li

    (Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU)
    Research & Development Institute of Northwestern Polytechnical University in Shenzhen)

Abstract

Perovskite solar cells (PSCs) are multilayer structures. The interface between electron transport layer and perovskite is the mechanical weakest point in flexible PSCs due to its low fracture energy. Herein, we develop a highly adhesive polyamide-amine-based hyperbranched polymers to reinforce the interface. The interface fracture energy is improved from 1.08 to 2.13 J·m−2 by the hyperbranched polymers with adhesive groups and dynamic hydrogen bond networks. The polymer functionalized perovskite solar cells achieve superior power conversion efficiencies of 25.05% and 23.86% for rigid and flexible devices, respectively. Furthermore, the hyperbranched polymer contains abundant intramolecular cavities that can capture Pb2+. Pb leakage after solar cell damage is effectively suppressed. Our findings provide insights on designing adhesive interface layers towards high-efficiency, mechanical-stable and environment-friendly flexible perovskite solar cells.

Suggested Citation

  • Zhihao Li & Chunmei Jia & Zhi Wan & Jiayi Xue & Junchao Cao & Meng Zhang & Can Li & Jianghua Shen & Chao Zhang & Zhen Li, 2023. "Hyperbranched polymer functionalized flexible perovskite solar cells with mechanical robustness and reduced lead leakage," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41931-1
    DOI: 10.1038/s41467-023-41931-1
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