A New Mechanism Enabling Micron Scale Electron–Hole Synchronized Recombination in Bulk Halide Perovskites

ABSTRACT Halide perovskites possess an intrinsically dynamic structure that strongly influences their electro‐optical performance and stability. Understanding how a microscopic phenomenon affects a global physical property is critical for better using these materials. Here, we suggest a new mechanism that explains synchronized electron–hole radiative recombination that extends over 10 µm well beyond the current understanding. The physical observable we follow is photoluminescence intermittencies in vapor grown, all‐inorganic halide perovskite crystals. This blinking effect is synchronized across distances well beyond the electron diffusion length, contradicting the widely accepted theory that assumes a “supertrap” involvement in photoluminescence intermittencies in halide perovskites. Such theories limit the range of synchronization of electron–hole radiative recombination by an order of magnitude to what we measure. We show beyond doubt a clear connection between the appearance of blinking and Pb‐rich growth conditions. Thus, the new framework puts the focus on hole diffusion to explain micron scale synchronization in halide perovskites.