A dual-regulation charge separation strategy with synergistic effect between a 1D/0D heterostructure and inserted ferroelectric layer in TiO₂/SrTiO₃/CdS composite photoanode is developed to boost the PEC performance of TiO₂.

In this work, we have reported self-powered narrowband visible-light photodetectors based on organolead halide perovskite CH₃NH₃PbBr₃ (MAPbBr₃)/p-Si heterojunctions, which were prepared by growing MAPbBr₃ microcrystals on the p-Si substrate using a room-temperature antisolvent-assisted crystallization method. Morphological, structural, and optical investigations showed that the as-grown MAPbBr₃ microcrystals possessed a high crystalline quality. Electrical characterizations showed that the hetero-pn junction was formed within the MAPbBr₃/p-Si heterojunction. Thanks to the high crystalline quality of MAPbBr₃ microcrystals, the as-fabricated heterojunction photodetectors operating under a bias voltage of 0 V exhibited a high on–off ratio of ∼5.3 × 10⁵, a narrow photosensitivity spectrum with the full width at half maximum of 18.2 nm, a high photoresponse speed with the rising/falling time of 115.7/53.4 ms, and excellent stability to visible-light signals. Finally, the photodetection mechanism was proposed. It showed that the observed narrowband photodetection was attributed to the self-filtering effect caused by the thick MAPbBr₃ microcrystals. The results presented in this work will provide valuable strategies for the fabrication of self-powered narrowband visible-light photodetectors in the future.

Au/LFO obtained by facile magnetron sputtering and sol–gel process presents a remarkable improvement in photocurrent up to −19.60 μA cm⁻².