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Spontaneous bifacial capping of perovskite film for efficient and mechanically stable flexible solar cell

Author

Listed:
  • Junjun Jin

    (Wuhan University)

  • Zhenkun Zhu

    (Wuhan University)

  • Yidong Ming

    (Hubei University)

  • Yuan Zhou

    (Wuhan University)

  • Jitao Shang

    (Wuhan University)

  • Shaofu Wang

    (Wuhan University)

  • Xiaxia Cui

    (Wuhan University)

  • Tonghui Guo

    (Wuhan University)

  • Dan Zhang

    (Wuhan University)

  • Guanqi Tang

    (Southwest Jiaotong University)

  • Qianqian Lin

    (Wuhan University)

  • Jinhua Li

    (Hubei University)

  • Xiaowei Liu

    (Chinese Academy of Sciences)

  • Sheng Liu

    (Wuhan University)

  • Zhiwen Chen

    (Wuhan University)

  • Zhao Hu

    (Peking University
    Wuhan Institute of Technology)

  • Hong Meng

    (Peking University)

  • Qidong Tai

    (Wuhan University)

Abstract

Flexible perovskite solar cells (F-PSCs) are appealing for their flexibility and high power-to-weight ratios. However, the fragile grain boundaries (GBs) in perovskite films can lead to stress and strain cracks under bending conditions, limiting the performance and stability of F-PSCs. Herein, we show that the perovskite film can facilely achieve in situ bifacial capping via introducing 4-(methoxy)benzylamine hydrobromide (MeOBABr) as the precursor additive. The spontaneously formed MeOBABr capping layers flatten the grain boundary grooves (GBGs), enable the release of the mechanical stress at the GBs during bending, rendering enhanced film robustness. They also contribute to the reduction of the residual strain and the passivation of the surface defects of the perovskite film. Besides, the molecular polarity of MeOBABr can result in surface band bending of the perovskite that favors the interfacial charge extraction. The corresponding inverted F-PSCs based on nickel oxide (NiOx)/poly(triaryl amine) (PTAA) hole transport bilayer reach a 23.7% power conversion efficiency (PCE) (22.9% certified) under AM 1.5 G illumination and a 42.46% PCE under 1000 lux indoor light illumination. Meanwhile, a robust bending durability of the device is also achieved.

Suggested Citation

  • Junjun Jin & Zhenkun Zhu & Yidong Ming & Yuan Zhou & Jitao Shang & Shaofu Wang & Xiaxia Cui & Tonghui Guo & Dan Zhang & Guanqi Tang & Qianqian Lin & Jinhua Li & Xiaowei Liu & Sheng Liu & Zhiwen Chen &, 2025. "Spontaneous bifacial capping of perovskite film for efficient and mechanically stable flexible solar cell," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-024-55652-6
    DOI: 10.1038/s41467-024-55652-6
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    References listed on IDEAS

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    1. Lingmei Kong & Yuqi Sun & Bin Zhao & Kangyu Ji & Jie Feng & Jianchao Dong & Yuanzhi Wang & Zirui Liu & Shabnum Maqbool & Yunguo Li & Yingguo Yang & Linjie Dai & Wanhee Lee & Changsoon Cho & Samuel D. , 2024. "Fabrication of red-emitting perovskite LEDs by stabilizing their octahedral structure," Nature, Nature, vol. 631(8019), pages 73-79, July.
    2. Xiaopeng Zheng & Zhen Li & Yi Zhang & Min Chen & Tuo Liu & Chuanxiao Xiao & Danpeng Gao & Jay B. Patel & Darius Kuciauskas & Artiom Magomedov & Rebecca A. Scheidt & Xiaoming Wang & Steven P. Harvey & , 2023. "Co-deposition of hole-selective contact and absorber for improving the processability of perovskite solar cells," Nature Energy, Nature, vol. 8(5), pages 462-472, May.
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