Flexible Omnidirectional Self-Powered Photodetectors Enabled by Solution-Processed Two-Dimensional Layered PbI₂ Nanoplates

Abstract

Realizing omnidirectional self-powered photodetectors is central to advancing next-generation portable and smart photodetector systems. However, the traditional omnidirectional photodetector is typically achieved by integrating complex hemispherical microlens on multiple photodetectors, which makes the detection system cumbersome and restricts its application in the portable field. Here, facile and high-performance flexible omnidirectional self-powered photodetectors are achieved by solution-processed two-dimensional (2D) layered PbI2 nanoplates on transparent conducting substrates. Characterization of PbI2 nanoplates microstructural/compositional and their photodetection properties have been systematically characterized. Under the irradiation of a 405 nm laser, the photodetectors exhibit an impressively low dark current of 10–13 A, a high light on/off ratio up to 106, and a fast rise/decay response time of 2/3 ms. Importantly, when light irradiates the photodetector at 5°, it can still maintain high photodetection properties, realizing almost 360° omnidirectional self-powered photodetection. What is more, these self-powered photodetectors exhibit robust omnidirectional photoresponse stability of flexibility even after bending for 1200 cycles. Thus, this work broadens the applicability of 2D layered nanoplates for further extending its applications in advanced optoelectronic devices.

Machine Vision Based on an Ultra‐Wide Bandgap 2D Semiconductor AsSbO3

“…[13,14] 2D materials are rich in electronic and photoelectronic properties, which makes them have great potential for applications in micro-nanoelectronics and optoelectronics such as optical detection and optical communication. [15][16][17][18] 2D materials are a large material system, but for most of them (graphene, [19] TMDs, [20,21] black-P, [22,23] etc.) the band gap is usually situated in the visible or infrared bands.…”

Strain-Tunable Ultrastable MoS2/Fluorographene Hybrid Photodetectors of High Responsivity

“…Moreover, the defects in FG trap the electrons and hence delay the recombination of electrons and holes, which enhances the photoresponse further, as we showed in our previous studies. , The photoresponsivity and detectivity are calculated, as detailed in the Supporting Information Figure S6, and the responsivity of MS and FGMS was compared. The FGMS device’s photoresponse is comparable to or higher than different systems like HgCdTe, PbI 2 , and GaSb nanowires. − …”

Ultraviolet‐Visible‐Short‐Wavelength Infrared Broadband and Fast‐Response Photodetectors Enabled by Individual Monocrystalline Perovskite Nanoplate

“…Normally, to obtain high performance in metal/semiconductor/metal-structured PDs, devices should have the long lifetime of trapped carriers and/or the low carrier transit time, which thus result in the ultraslow response speed. [71,72] Typically, both high detectivity and fastresponse speed are highly desirable features for efficient photodetection toward high speed uses. As shown in Figure 2i and Figure S5, Supporting Information, we summarize and compare the EQE, specific detectivity, and response time of various perovskite-based PDs.…”