Inhomogeneous Deactivation with UV Excitation in Submicron Grains of Lead Iodide Perovskite-based Solar Cell as Revealed by Femtosecond Transient Absorption Microscopy

Femtosecond transient absorption microscopy was applied to the elucidation of ultrafast dynamics in a lead iodide perovskite solar cell. Space- and time-resolved detection revealed that rapid deactivation with a time constant of 0.7 Ps took place without long-living species in submicron grains with the (CH3NH3)PbI3 capping layer, while the long-living component was detected in other areas.