In-situ investigation of ionic migration induced degradation of halide perovskites

Halide perovskites have attracted significant attention due to their excellent optoelectronic properties and potential applications in solar cells, LEDs, photodetectors, etc. Nevertheless, being soft and ionic in nature, halide perovskites often exhibit ionic migration induced degradation during device operation. The aim of this project is to uncover the exact mechanism of ionic migration induced restructuring which is triggered by electric field. We will compare the role of several inhibitors (such as organic molecules, dopant, and polymers) which act as the barrier of the ionic migration. The structural dynamics under different electric field will be captured with both time and diffraction resolution. The full characterization of these phases will provide a mechanistic insights into the pathways underpinning the unwanted phase transformation and degradation, and ultimately allowing us to propose new methods to stabilize halide perovskite-based optoelectronic devices.