We demonstrate enhanced performance of solution-processed photodetectors composed of all-inorganic CsPbBr 3 perovskite films with ZnO nanoparticles (NPs) decoration. Introducing ZnO NPs into CsPbBr 3 precursor solution results in the film with more uniformly and compactly distributed crystalline grains. ZnO NPs can also promote the transport of photon-generated carriers from the central CsPbBr 3 absorption layer to the lateral electrodes. Meanwhile, the asymmetry electrodes, i.e., indium tin oxide and silver, of the photodetectors create a built-in electric field driving the photodetectors operation without external bias voltage. Compared to the photodetectors without ZnO decoration, the fabricated all-inorganic CsPbBr 3 :ZnO photodetectors achieve a comparable rise time of 0.409 s, a fall time of 17.92 ms, and an on/off ratio of 12.86 without external bias source. [ABSTRACT FROM AUTHOR]