Single-Layer ZnO Hollow Hemispheres Enable High-Performance Self-Powered Perovskite Photodetector for Optical Communication

Abstract

The carrier transport layer with reflection reduction morphology has attracted extensive attention for improving the utilization of light. Herein, we introduced single-layer hollow ZnO hemisphere arrays (ZHAs) behaving light trapping effect as the electron transport layer in perovskite photodetectors (PDs). The single-layer hollow ZHAs can not only reduce the reflection, but also widen the angle of the effective incident light and especially transfer the distribution of the optical field from the ZnO/FTO interface to the perovskite active layer confirmed by the 3D finite-difference time-domain simulation. These merits benefit for the generation, transport and separation of carriers, improving the light utilization efficiency. Finally, our optimized FTO/ZHA/CsPbBr3/carbon structure PDs showed high self-powered performance with a linear dynamic range of 120.3 dB, a detectivity of 4.2 × 1012 Jones, rise/fall time of 13/28 µs and the f−3 dB of up to 28 kHz. Benefiting from the high device performance, the PD was demonstrated to the application in the directional transmission of encrypted files as the signal receiving port with super high accuracy. This work uniquely utilizes the features of high-performance self-powered perovskite PDs in optical communication, paving the path to wide applications of all-inorganic perovskite PDs.

Phase Regulation of CsPb2Br5/CsPbBr3 Perovskite Nanocrystals by Doping with Divalent Cations: Implications for Optoelectronic Devices with Enhanced Stability and Reduced Toxicity

“…As shown in Figure b (left and middle), the TEM and HR-TEM images exhibit that the as-prepared Ca 2+ -doped dual-phase NCs (Pb/Ca = 9:1) have better crystallinity and more regular morphology than the original ones. In addition, in Figure b (middle), the contracted lattice fringe (0.36 nm) may belong to the (202) facet of CsPb 2 Br 5 because of partial substitution of Pb 2+ ions by Ca 2+ ones. TEM and HR-TEM images of the Sr 2+ -doped dual-phase NCs (Pb/Sr = 5:1) are presented in Figure c (left and middle, respectively).…”

2D/3D Halide Perovskites for Optoelectronic Devices

“…Photodetectors are semiconductor devices which convert optical signals into electrical signals and play an important part in imaging systems, optical communications, biosensing, and environmental monitoring ( Gong et al, 2009 ; Dong et al, 2011 ; Zhao, 2011 ; Li Chong et al, 2014 ; Büchele et al, 2015 ; Yang Hua et al, 2015 ; Wang Yan and Zhang Rui, 2016 ; Yan Peiqin et al, 2017 ; Tong et al, 2017 ; Yang et al, 2018b ; Zhou et al, 2018b ; Zhang et al, 2020a ; Wu et al, 2020 ; Pan et al, 2020 ; Loi et al, 2020 ; Song et al, 2021 ; Pan et al, 2021 ). In general, the working principle of a photodetector includes three processes: 1) absorption of incident light to generate carriers; 2) carrier migration; 3) the collection of the carriers to generate current signals.…”

A tin oxide/silicon heterojunction with a nano litchi shell structure for ultrafast, high-detectivity, self-powered broadband photodetectors

“…Hence, selfpowered photodetectors have aroused extensive research interest. [17][18][19][20] However, it is still challenging to develop excellent light-absorbing materials and realize effective separation of carriers in photodetectors for the practical application of selfpowered photodetectors.…”