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Aqueous Precursor Induced Morphological Change and Improved Water Stability of CsPbBr3 Nanocrystals.

In literature, lead halide perovskites are very notable for their degradation in the presence of polar solvents, such as water. In contrast to this research, we observed that adding minor amount of water in precursor solution can improve the stability and photoluminescence quantum yield of CsPbBr3 nanocrystals through a ligand-assisted reprecipitation (LARP) method. In this order, the shape and phase transformation from CsPbBr3 nanoplates to CsPbBr3/Cs4PbBr6 nanorods and Cs4PbBr6 nanowires can be controlled with increasing water content in the precursor solution. While adding water up to an ideal amount, CsPbBr3 maintains its phase and nanoplates morphology. The key role of water amount for tuning the crystallinity, stability, morphology, optical properties and phase transformation of cesium lead halide perovskite nanocrystals will be beneficial in future commercialization of optoelectronics.