Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.224
Publication date: 23rd September 2021
Isothermal phase transformations in lead iodide perovskite nanocrystals of different A-site compositions were studied by tracking the black-to-yellow color change in nanocrystal films and modeling the transformation kinetics. At 210 oC, CsPbI3 turned completely yellow in 25 min, while it took MAPbI3 and FAPbI3 longer time to complete the color change. CsPbI3 transformed from the black perovskite phase to the yellow non-perovskite phase, while MAPbI3 and FAPbI3 chemically decomposed and formed PbI2 as the new phase. Mixed A-site perovskites CsMAPbI3 and CsFAPbI3 showed slower rate of transformation than single A-site perovskites, and their degradation products were coexisting yellow phase CsPbI3 and PbI2. Different capping ligands also played a role in changing the transformation kinetics.
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