Photodetector Based on CsPbBr3/Cs4PbBr6 Composite Nanocrystals with High Detectivity

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.

Three-Dimensional Lead Halide Perovskites Embedded in Zero-Dimensional Lead Halide Perovskites: Synthesis, Stability, and Applications

“…74 As an example, CsPbBr 3 crystals have sensitive photoresponse properties but poor PL properties, whereas CsPbBr 3 in Cs 4 PbBr 6 crystals show relatively good PL properties but low photoresponse. 38 The correlation between the optoelectrical properties of the two crystal structures was investigated by Cha et al Figure 6a shows a schematic of the high photocurrent and low PL emission intensity obtained when the CsPbBr 3 crystal is used as a light-sensing layer. Low photocurrent generation and strong PL intensity are observed when a Cs 4 PbBr 6 crystal with 3D CsPbBr 3 NCs is used, as shown in Figure 6b.…”

“…Cs-based perovskites are used as light-sensing layers for photodetectors because of their significant optical and electrical properties due to their strong absorption coefficient, long exciton diffusion length, and good conductivity . As an example, CsPbBr 3 crystals have sensitive photoresponse properties but poor PL properties, whereas CsPbBr 3 in Cs 4 PbBr 6 crystals show relatively good PL properties but low photoresponse . The correlation between the optoelectrical properties of the two crystal structures was investigated by Cha et al Figure a shows a schematic of the high photocurrent and low PL emission intensity obtained when the CsPbBr 3 crystal is used as a light-sensing layer.…”

“…However, the synthesis should be properly controlled because the structure inhibits the transport of electrons and holes . Notably, 3D-0D lead halide perovskites have been used in various applications, including white light-emitting diodes (WLEDs), perovskite LEDs (PeLEDs), solar cells, photodetectors, luminescent solar concentrators (LSCs), and lasers. ,,− To accelerate the development of these applications using 0D perovskites, a comprehensive understanding of the development trend of current devices is essential. In this review, we discuss research trends of the applications of 3D-0D perovskites based on the photophysical characteristics of these applications.…”