Abstract
High-quality, all-inorganic CsPbBr3/Cs4PbBr6 composite perovskite nanocrystals (NCs) were obtained with all-solution-processing at room temperature, and a photodetector (PD) with high detectivity was realized based on CsPbBr3/Cs4PbBr6 NCs. The detectivity (D*) of the proposed PD is 4.24 × 1012 Jones 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.
Highlights
All-inorganic lead halide perovskites have shown excellent photoelectrical properties with high absorption coefficients, wide spectra, high carrier mobility values, and long charge diffusion lengths
The intensity of the diffraction peaks of Cs4 PbBr6 is much higher than those of CsPbBr3, which means that the main component of the NCs is Cs4 PbBr6
It can be found that the lattice fringes of 0.68 nm can be indexed to the (110) lattice planes of orthorhombic Cs4 PbBr6, while the lattice fringes of 0.29 nm can be indexed to the (200) lattice planes of cubic CsPbBr3
Summary
All-inorganic lead halide perovskites have shown excellent photoelectrical properties with high absorption coefficients, wide spectra, high carrier mobility values, and long charge diffusion lengths. Because of these advantages, they are widely used in PDs [1,2,3,4], solar cells [5,6,7,8], lasers [9,10,11], light-emitting diodes [12,13,14], and so on. Li et al reported an interesting recyclable dissolution–recrystallization phenomenon of CsPbBr3 NCs and its application on the room temperature self-healing of compact and smooth carrier channels for PDs with D*
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