Photodetector Based on CsPbBr3/Cs4PbBr6 Composite Nanocrystals with High Detectivity

High-quality, all-inorganic CsPbBr3/Cs4PbBr6composite perovskite nanocrystals (NCs) were obtained with all-solution-processing at room temperature, and a photodetector (PD) with high detectivity was realized based on CsPbBr3/Cs4PbBr6NCs. The detectivity (D*) of the proposed PD is 4.24 × 1012Jones under 532 nm illumination, which is among the highest levels for PDs based on all-inorganic perovskite NCs. In addition, a high linear dynamic range (LDR) of 115 dB under 1 V bias was also realized. Furthermore, the underlying mechanism for the enhanced performance of the proposed PD was discussed. Our work might promote the preparation of high-performance PDs based on dual-phase all-inorganic perovskite nanocrystals.Keywords:all-inorganic lead halide perovskite;CsPbBr3;Cs4PbBr6;perovskite nanocrystals;photodetector