Observing Phase Transition Dynamics in Halide Perovskite Nanowires via in Situ 4D-STEM.
Phase transitions in halide perovskites critically influence their optoelectronic performance and stability, yet the nanoscale pathways by which structural transformations proceed remain elusive because of their soft ionic lattice and electron-beam sensitivity. Here, we combine in situ heating with four-dimensional sca...