Spontaneous formation of robust two-dimensional perovskite phases

Tan, Shaun; Shih, Meng-Chen; Lu, Yongli; Choi, Seung-Gu; Dong, Yifan; Lee, Joo-Hong; Yavuz, Ilhan; Larson, Bryon W; Park, So Yeon; Kodalle, Tim; Zhang, Ruiqi; Grotevent, Matthias J; Lin, Yu-Kuan; Zhu, Hua; Bulović, Vladimir; Sutter-Fella, Carolin M; Park, Nam-Gyu; Beard, Matthew C; Lee, Jin-Wook; Zhu, Kai; Bawendi, Moungi G

doi:10.1126/science.adr1334

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Spontaneous formation of robust two-dimensional perovskite phases

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Abstract

The two-dimensional on three-dimensional (2D/3D) perovskite bilayer heterostructure can improve the stability and performance of perovskite solar cells. We show that the 2D/3D perovskite stack in a device evolves dynamically during its end-of-life decomposition. Initially phase-pure 2D interlayers can evolve differently, resulting in different device stabilities. We show that a robust 2D interlayer can be formed using mixed solvents to regulate its crystallinity and phase purity. The resulting 2D/3D devices achieved 25.9% efficiency and had good durability, retaining 91% of their initial performance after 1074 hours at 85°C using maximum power point tracking.

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Tan, Shaun, Shih, Meng-Chen, Lu, Yongli, Choi, Seung-Gu, Dong, Yifan, Lee, Joo-Hong, Yavuz, Ilhan, Larson, Bryon W, Park, So Yeon, Kodalle, Tim, Zhang, Ruiqi, Grotevent, Matthias J, Lin, Yu-Kuan, Zhu, Hua, Bulović, Vladimir, Sutter-Fella, Carolin M, Park, Nam-Gyu, Beard, Matthew C, Lee, Jin-Wook, Zhu, Kai, Bawendi, Moungi G. 2025-05-08. Spontaneous formation of robust two-dimensional perovskite phases. https://doi.org/10.1126/science.adr1334

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