Current Understanding of Phase Transformations in Lead Halide Perovskites

Halide perovskites have shown great promise for applications that span from solar cells to lasers and radiation detectors. However, these materials suffer from rapid phase transformations upon exposure to external stimuli. Therefore, it is essential to unravel the mechanisms that lead to these phase transformations in order to design materials that can withstand different environmental conditions. Thus far, there is little understanding of how chemistries influence phase transformations in lead halide perovskite when these are exposed to external stimuli. In this presentation, I will discuss the role of chemistry on phase transformations of lead halide perovskites through in-situ synchrotron-based techniques. The importance of these phase transformations on the optoelectronic properties of the halide perovskite materials will also be discussed.