Abstract
The microstructure of halide perovskites during thermally driven phase transition and degradation is difficult to probe because of their radiation-sensitive nature. Taking advantage of low dose in situ high-resolution transmission electron microscopy imaging, we directly observed the nucleation and growth process of the phase transition from orthorhombic γ-CsPbBr3 to cubic α-CsPbBr3 in nanoplates during heating. The normalization of (PbBr6)4– octahedra was observed, and phase transition pathways (edge-to-center growth and island growth) were summarized. Phase fluctuation/recovery occurs during the phase transition process. In addition, the thermal degradation caused by high temperature was investigated. Degradation occurs from the outer edge to the center region. This work provides a microscopic basis for the understanding of phase transition and its application in devices.
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