Light-Induced Structural Dynamics in the Hybrid Perovskites—From Femtoseconds to Seconds

I will describe recent results focused on elucidating the atomistic response of the hybrid perovskites to light, probing both the ultrafast dynamics that potentially underlies their unique optoelectronic functionalities and the dynamical processes that underlie how these materials degrade. In the first part of the talk I will focus on time-resolved x-ray and electron scattering approaches as applied to a range of material systems including single crystals, thin films, and nanocrystals and describe how these efforts enable new understanding of electron-phonon coupling processes. In the second part I will describe new efforts using cryo-electron microscopy coupled to light to capture structural intermediates during the phase segregation process in mixed-halide perovskite films.