Robust Self‐Assembled Molecular Passivation for High‐Performance Perovskite Solar Cells

Defect passivation via post‐treatment of perovskite films is an effective method to fabricate high‐performance perovskite solar cells (PSCs). However, the passivation durability is still an issue due to the weak and vulnerable bonding between passivating functional groups and perovskite defect sites...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2022-06, Vol.61 (25), p.e202204148-n/a
Main Authors: Guo, Haodan, Fang, Yanyan, Cheng, Hong‐Bo, Wu, Jinpeng, Lei, Yan, Wang, Shumao, Li, Xiangrong, Dai, Yuhua, Xiang, Wanchun, Xue, Ding‐Jiang, Lin, Yuan, Hagfeldt, Anders
Format: Article
Language:English
Subjects:
Bonding strength
Cholesterol
Circuits
Crystal defects
Durability
Durable Passivation
Energy conversion efficiency
Functional groups
Grain boundaries
Intermolecular Interaction
Membrane
Membranes
Passivity
Perovskite Solar Cells
Perovskites
Photovoltaic cells
Robustness
Self-Assembly
Solar cells
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Summary:Defect passivation via post‐treatment of perovskite films is an effective method to fabricate high‐performance perovskite solar cells (PSCs). However, the passivation durability is still an issue due to the weak and vulnerable bonding between passivating functional groups and perovskite defect sites. Here we propose a cholesterol derivative self‐assembly strategy to construct crosslinked and compact membranes throughout perovskite films. These supramolecular membranes act as a robust protection layer against harsh operational conditions while providing effective passivation of defects from surface toward inner grain boundaries. The resultant PSCs exhibit a power conversion efficiency of 23.34 % with an impressive open‐circuit voltage of 1.164 eV. The unencapsulated devices retain 92 % of their initial efficiencies after 1600 h of storage under ambient conditions, and remain almost unchanged after heating at 85 °C for 500 h in a nitrogen atmosphere, showing significantly improved stability. A crosslinked and compact membrane is constructed throughout the perovskite film by a self‐assembly strategy based on cholesterol‐based molecules. This enables durable passivation against harsh conditions and effective defects passivation from surface toward inner grain boundaries. The modified planar perovskite solar cells (PSCs) exhibit a 23.34 % champion efficiency and remain almost unchanged after heating at 85 °C for 500 h.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202204148