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Self‐trapped excitons (STEs), proved to be the major source of white‐light emission in 2D metal halide perovskites (MHPs) van der Waals (vdW) heterostructures, have aroused intense interest in photovoltaic and photoelectric applications. Nevertheless, the intrinsic mechanisms of STEs in these vdW heterostructures are still ambiguous. Herein, the binding energy correction of a STE stemming...