Ethylammonium Lead Iodide Formation in MAPbI<sub>3</sub> Precursor Solutions by DMF Decomposition and Organic Cation Exchange Reaction
oleh: Ryan Taoran Wang, Elton Enchong Liu, Alex Fan Xu, Lory Wenjuan Yang, Jason Yuanzhe Chen, Gu Xu
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2020-03-01 |
Deskripsi
Extra peaks have constantly been observed in the X-ray diffraction measurement for the CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> 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 (CH<sub>3</sub>CH<sub>2</sub>NH<sub>3</sub>PbI<sub>3</sub>/EAPbI<sub>3</sub>). It was found that the formation of EAPbI<sub>3</sub> was triggered by the breakdown of N, N-dimethylformamide (DMF), which was adopted as the solvent in the preparation of the precursor solutions. EAPbI<sub>3</sub> was generated by the organic cation exchange reaction in the subsequent annealing process.<b> </b>A simple solution for this problem is proposed in this paper as well, which would hopefully help the community to eradicate this impurity.