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Updated: Mar 28, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
Enhanced Stability of Halide Perovskite by Strengthening Hydrogen Bonds
Yanfeng Yin1,2, Yansong Zhou3, Hongli Xuan4
1State Key Laboratory of Chemical Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Abstract:
The instability of metal-halide perovskites intrinsically stems from weak hydrogen bonding in their organic-inorganic hybrid structure. Here, we demonstrate that prolonged pressure treatment at ∼1.8 GPa for 12 h induces a permanent lattice modification in (FAPbI3)0.9 5(MAPbBr3)0.0 5 polycrystalline films, characterized by strengthened hydrogen bonding between FA cations and iodide. Notably, such pressure-induced H-bond enhancement is preservable after decompression and yields dramatic stability improvements: Light-induced phase segregation is slowed by 12-fold, while resistance to illumination, heat, and moisture improves by four to six times. First-principles calculations reveal that the treatment raises the migration barrier for iodide, explaining the observed suppression of ion migration and phase segregation. These results establish that prolonged pressure treatment can enhance hydrogen bonding and produce substantially more stable perovskite materials and devices without altering their composition.
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