Modelling Thermal Halide Exchange of Perovskite Powders With and Without BMIMBF4 From an Interdiffusion Perspective

Halide migration limits the stability of hybrid halide perovskites for optoelectronic applications, yet can be decelerated at room temperature by adding ionic liquids. An approach is presented to quantitatively evaluate the diffusion of I− and Br− to form MAPbIxBr3-x from neat perovskite powders. First, in situ X-ray diffraction (XRD) data are used to extract the […]