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. 2016 Jan 6;7:10228. doi: 10.1038/ncomms10228

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(a) Schematic diagram of the hydrogen bonding formation between PEG molecules and MAPbI₃. (b) A comparison of NMR spectra from 3.0 to 8.0 p.p.m. among three samples: deuterated DMSO solutions with MAPbI₃, mixture of MAPbI₃+PEG and PEG, respectively. (c) Schematic diagram to show mechanisms for the self-healing properties in PPSCs: (1) Water absorb on perovskite; (2) Perovskite hydrolysis into PbI₂ and MAI·H₂O by water; (3). Restrained MAI by PEG react with nearby PbI₂ to form perovskite again after water evaporates. PEG has a strong interaction with MAI, preventing it from evaporating, subsequently MAI and PbI₂ react in situ to form perovskite after the film was removed away from the vapour source.