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

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 (), Zhao Hu (), Hong Meng () and Qidong Tai ()
Additional contact information
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
Hong Meng: Peking University
Qidong Tai: Wuhan University

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-024-55652-6

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