Flexible and Self‐Powered Lateral Photodetector Based on Inorganic Perovskite CsPbI₃–CsPbBr₃ Heterojunction Nanowire Array

Abstract

Self-powered perovskite photodetectors mainly adopt the vertical heterojunction structure composed of active layer, electron-hole transfer layers, and electrodes, which results in the loss of incident light and interfacial accumulation of defects. To address these issues, a self-powered lateral photodetector based on CsPbI 3 -CsPbBr 3 heterojunction nanowire arrays is designed on both a rigid glass and a flexible polyethylene naphthalate substrate using an in situ conversion and mask-assisted electrode fabrication method. Through adding the polyvinyl pyrrolidone and optimizing the concentration of precursors under the pressure-assisted moulding process, both the crystallinity and stability of perovskite nanowire array are improved. The nanowire array-based lateral device shows a high responsivity of 125 mA W −1 and a fast rise and decay time of 0.7 and 0.8 ms under a self-powered operation condition. This work provides a new strategy to fabricate perovskite heterojunction nanoarrays towards self-powered photodetection.

Ionic Liquid Stabilizing High‐Efficiency Tin Halide Perovskite Solar Cells

“…DMSO molecules were almost completely removed from the film, showing a relatively uniform diffraction intensity. [28] Notably, for the BAAc-containing perovskite film, the crystallinity in the initial annealing stage (within the first ≈70 s) is significantly improved (Figure 3b), which may originate from a more stable precursor solution. [18] Moreover, the scattering halos centered at q = 10, 17.5, and 20 nm -1 gradually shift to higher q values.…”

Anisotropic In Situ Strain‐Engineered Halide Perovskites for High Mechanical Flexibility

“…[ 1,2 ] Because of the low processing temperature of the halide materials, various flexible polymer substrates such as polyethylene terephthalate, polyethylene naphthalate, and polyimide can be used as the base for the subsequent deposition of polycrystalline halide thin films. [ 3–5 ] In addition to the required electrical and optical properties for the halides, the mechanical compatibility of the halide layers with the polymer substrates needs to be carefully considered to determine the allowable flexibility of these structures and thereby achieve long‐term reliability. However, the mechanical behavior of the flexible halide layer on the polymer substrate under bending or flexible environments has been very limitedly reported so far, while most of the devices are using the halides as the form of polycrystalline thin films.…”

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

“…The responsivity of the device shows a biggest value under the light intensity of 7 × 10 -4 mW cm −2 , reaching 0.1 A W −1 , which slightly decreases when increasing the light intensity. Besides, the detectivity of the device shows the biggest value of 4.2 × 10 12 Jones, which is comparable to or even better than other perovskite PDs [48][49][50][51][52], and the detailed comparison is shown in Table 1. In addition, our PDs show fast response speed with the rise/falling time of 13/28 µs (Fig.…”