Ethylammonium Lead Iodide Formation in MAPbI3 Precursor Solutions by DMF Decomposition and Organic Cation Exchange Reaction

Extra peaks have constantly been observed in the X-ray diffraction measurement for the CH3NH3PbI3 film. Such mysteries have now been uncovered in this paper, in which powder X-ray diffraction, in situ X-ray diffraction, and scanning electron microscopy measurements were conducted, and these peaks we...

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Bibliographic Details
Published in:Crystals (Basel) 2020-03, Vol.10 (3), p.162
Main Authors: Wang, Ryan Taoran, Liu, Elton Enchong, Xu, Alex Fan, Yang, Lory Wenjuan, Chen, Jason Yuanzhe, Xu, Gu
Format: Article
Language:English
Subjects:
in-situ xrd
organic cation exchange reaction
organic perovskite
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Summary:Extra peaks have constantly been observed in the X-ray diffraction measurement for the CH3NH3PbI3 film. Such mysteries have now been uncovered in this paper, in which powder X-ray diffraction, in situ X-ray diffraction, and scanning electron microscopy measurements were conducted, and these peaks were attributed to the ethylammonium lead iodide (CH3CH2NH3PbI3/EAPbI3). It was found that the formation of EAPbI3 was triggered by the breakdown of N, N-dimethylformamide (DMF), which was adopted as the solvent in the preparation of the precursor solutions. EAPbI3 was generated by the organic cation exchange reaction in the subsequent annealing process. A simple solution for this problem is proposed in this paper as well, which would hopefully help the community to eradicate this impurity.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst10030162