Lead-free double halide perovskites stand out as a promising material for constructing stable and environmental-friendly photodetectors (PDs) because of the excellent stability and nontoxicity. However, the performance (e.g., detectivity and response speed) of lead-free double halide perovskites based PDs is still low. Herein, highly sensitive, stable, and fast-response Cs 2 AgBiBr 6 perovskite PDs are presented by synergistic engineering of doping optimization of Na + /Ce 3+ and integrating with Ag nanoparticles (NPs). Compared to pristine Cs 2 AgBiBr 6 , Cs 2 AgBiBr 6 :Na + ,Ce 3+ film is endowed with higher crystallization quality and better stability after Na + ,Ce 3+ codoping, toward the reduced defect density, the improved charge mobility. Meanwhile, a significantly enhanced charge extraction and transport in Cs 2 AgBiBr 6 :Na + ,Ce 3+ /Ag NPs hybrid film is achieved by further integrating with Ag NPs. Finally, Cs 2 AgBiBr 6 :Na + ,Ce 3+ /Ag NPs hybrid film-based PDs are developed, delivering high detectivity of 1.34 × 10 12 Jones@460 nm and 1.18 × 10 12 Jones@370 nm, which is the relatively high in lead-free double halide perovskites PDs and exceeds the most results of the previous reports in the ultraviolet and visible range. The devices also show outstanding stability and fast-response time (395 ns). This work opens up a novel frontier for developing lead-free perovskite PDs.

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