Direct Observation of Fast Carriers Transport along Out-of-Plane Direction in a Dion–Jacobson Layered Perovskite

Layered perovskites have been broadly applied in perovskite solar cells and light-emitting diodes to enhance device stability, but the poor carrier transport property along the out-of-plane direction for all known Ruddlesden–Popper (RP) layered perovskites imposes constraints to their application. Herein, using transient photoluminescence mapping, we visualized that the transport of carriers or excitons along the out-of-plane direction is comparable to along the in-plane direction in a Dion–Jacobson (DJ) layered perovskite, which has the reduced ligand length and stronger I···I electronic interaction between inorganic layers.