Interfacial Electronic Restructuring in MAPbBr ₃ /rGO Hybrids Enabling Improved Charge Extraction for Efficient Photodetection

ABSTRACT Solution‐processed chemical mixing of graphene‐related materials can improve the charge extraction and stability of perovskite materials and devices. In this study, we synthesize MAPbBr ₃ /reduced graphene oxide (rGO) composites using room‐temperature‐based solvent acidolysis crystallization technique. The dispersion of flake‐like rGO gets incorporated into cubic perovskites, enabling interactions between the oxygen‐containing species of rGO and the perovskite, resulting in interfacial electronic restructuring and complete quenching of the photoluminescence (PL). As active layers in photodetectors, these composites demonstrate significantly higher photocurrent, along with a four order of magnitude increase in responsivity and two orders of magnitude increase in detectivity compared to MAPbBr ₃ . This is attributed to more efficient exciton dissociation and favorable energy level alignment with ITO (indium‐doped tin oxide) electrodes. In addition, the time required for the initial photocurrent to drop to 80% ( T ₈₀ ) under continuous illumination under ambient air increases from 0.5 to 3 min, highlighting the critical role of rGO in enhancing the photostability. This work demonstrates the significant effect of rGO composites in developing more efficient and stable perovskite‐based photodetectors.