High‐Performance Self‐Powered Perovskite Photodiodes for Blue‐Light Detection Using Anisole‐Assisted Precursor Engineering

ABSTRACT We report anisole‐assisted precursor engineering to realize high‐performance wide‐bandgap perovskite photodiodes for self‐powered blue‐light detection. Incorporating anisole as an internal antisolvent and applying a brief anisole bathing post‐treatment yield pinhole‐free films with enlarged grains. Under self‐powered operation (0 V), the devices achieve a low dark current density of 4.89 nA cm −2 and an external quantum efficiency (EQE) of 78.11% at 380 nm, corresponding to a responsivity of 0.27 A W −1 and a detectivity of 6.77 × 10 12 Jones. The photodiodes maintain over 97% of their initial EQE after 1000 h of storage without encapsulation. These results highlight a practical route toward stable, self‐powered perovskite photodiodes with high sensitivity in the 350–490 nm range.