Ultrafast Heterodyne Infrared Nano-Imaging of Polaron Dynamics in Lead Halide Perovskites

Ultrafast heterodyne infrared nano-imaging has been developed to reveal nanoscale heterogeneity of polaron formation, dynamics, and polaron-cation coupling in lead halide perovskites, with real space-time mapping of elementary electron-phonon coupling underlying their optoelectronic response.