Orientated crystallization of FA-based perovskite via hydrogen-bonded polymer network for efficient and stable solar cells

Mubai Li, Riming Sun, Jingxi Chang, Jingjin Dong, Qiushuang Tian, Hongze Wang, Zihao Li, Pinghui Yang, Haokun Shi, Chao Yang, Zichao Wu, Renzhi Li, Yingguo Yang, Aifei Wang, Shitong Zhang, Fangfang Wang (), Wei Huang () and Tianshi Qin ()
Additional contact information
Mubai Li: Nanjing Tech University (NanjingTech)
Riming Sun: Nanjing Tech University (NanjingTech)
Jingxi Chang: Nanjing Tech University (NanjingTech)
Jingjin Dong: Nanjing Tech University (NanjingTech)
Qiushuang Tian: Nanjing Tech University (NanjingTech)
Hongze Wang: Nanjing Tech University (NanjingTech)
Zihao Li: Nanjing Tech University (NanjingTech)
Pinghui Yang: Nanjing Tech University (NanjingTech)
Haokun Shi: Nanjing Tech University (NanjingTech)
Chao Yang: Nanjing Tech University (NanjingTech)
Zichao Wu: Nanjing Tech University (NanjingTech)
Renzhi Li: Nanjing Tech University (NanjingTech)
Yingguo Yang: Chinese Academy of Sciences
Aifei Wang: Nanjing Tech University (NanjingTech)
Shitong Zhang: Jilin University
Fangfang Wang: Nanjing Tech University (NanjingTech)
Wei Huang: Nanjing Tech University (NanjingTech)
Tianshi Qin: Nanjing Tech University (NanjingTech)

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Incorporating mixed ion is a frequently used strategy to stabilize black-phase formamidinum lead iodide perovskite for high-efficiency solar cells. However, these devices commonly suffer from photoinduced phase segregation and humidity instability. Herein, we find that the underlying reason is that the mixed halide perovskites generally fail to grow into homogenous and high-crystalline film, due to the multiple pathways of crystal nucleation originating from various intermediate phases in the film-forming process. Therefore, we design a multifunctional fluorinated additive, which restrains the complicated intermediate phases and promotes orientated crystallization of α-phase of perovskite. Furthermore, the additives in-situ polymerize during the perovskite film formation and form a hydrogen-bonded network to stabilize α-phase. Remarkably, the polymerized additives endow a strongly hydrophobic effect to the bare perovskite film against liquid water for 5 min. The unencapsulated devices achieve 24.10% efficiency and maintain >95% of the initial efficiency for 1000 h under continuous sunlight soaking and for 2000 h at air ambient of ~50% humid, respectively.

Date: 2023
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DOI: 10.1038/s41467-023-36224-6

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