Inhibiting perovskite decomposition by a creeper-inspired strategy enables efficient and stable perovskite solar cells

Shuxian Du, Hao Huang, Zhineng Lan, Peng Cui, Liang Li, Min Wang, Shujie Qu, Luyao Yan, Changxu Sun, Yingying Yang, Xinxin Wang and Meicheng Li ()
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Shuxian Du: North China Electric Power University
Hao Huang: North China Electric Power University
Zhineng Lan: North China Electric Power University
Peng Cui: North China Electric Power University
Liang Li: North China Electric Power University
Min Wang: North China Electric Power University
Shujie Qu: North China Electric Power University
Luyao Yan: North China Electric Power University
Changxu Sun: North China Electric Power University
Yingying Yang: North China Electric Power University
Xinxin Wang: North China Electric Power University
Meicheng Li: North China Electric Power University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract The commercialization of perovskite solar cells is badly limited by stability, an issue determined mainly by perovskite. Herein, inspired by a natural creeper that can cover the walls through suckers, we adopt polyhexamethyleneguanidine hydrochloride as a molecular creeper on perovskite to inhibit its decomposition starting from the annealing process. The molecule possesses a long-line molecular structure where the guanidinium groups can serve as suckers that strongly anchor cations through multiple hydrogen bonds. These features make the molecular creeper can cover perovskite grains and inhibit perovskite decomposition by suppressing cations’ escape. The resulting planar perovskite solar cells achieve an efficiency of 25.42% (certificated 25.36%). Moreover, the perovskite film and device exhibit enhanced stability even under harsh damp-heat conditions. The devices can maintain >96% of their initial efficiency after 1300 hours of operation under 1-sun illumination and 1000 hours of storage under 85% RH, respectively.

Date: 2024
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DOI: 10.1038/s41467-024-49617-y

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