Endogenous Synergistic Enhanced Self‐Powered Photodetector via Multi‐Effect Coupling Strategy toward High‐Efficiency Ultraviolet Communication

Abstract

Ultraviolet (UV) communication is a promising security optical wireless communication technology, and self‐powered photodetectors as their optical receivers offer formidable evolution opportunities. However, insufficient light harvesting and carrier separation of self‐powered photodetectors hinder them from achieving high‐efficiency UV communication. Herein, a multi‐effect coupling strategy is proposed to design an enhanced self‐powered Ag NPs@ZnO nanowires/PEDOT:PSS (AZP) UV photodetector. Taking full advantage of the plasmonic and pyro‐phototronic coupling effect, the endogenous synergistic enhancement of UV light utilization and charge separation efficiency is realized without external field. The responsivity and detectivity of the AZP photodetector are significantly increased more than two and three times respectively, and the response time is less than 0.1 ms. Furthermore, a UV communication system is integrated based on the self‐powered AZP photodetector that conducts synchronous, accurate, and rapid wireless data transmission. Notably, the integrated UV communication system presenting large communication bandwidth with 4800 baud exhibits desirable efficient information transmission potential. This work provides design strategies for the advanced self‐powered UV photodetector toward future energy‐saving and high‐efficiency optical wireless communication.

All-in-One Optoelectronic Logic Gates Enabled by Bipolar Spectral Photoresponse of CdTe/SnSe Heterojunction

“…Especially, the polarity of the photocurrent at a zero voltage exhibits a large dependence on the laser wavelength, leading to the bipolar spectral photoresponse. Under visible (Vis) 405 nm illumination, the photocurrent is negative, which is similar to other results induced by the PV effect. , However, the photocurrent becomes positive under infrared (IR) 1550 nm illumination, and the polarity is reversed, implying that the photoresponse could be charged by a new physical mechanism when the light irradiation is changed from 405 to 1550 nm wavelength.…”

“…Under visible (Vis) 405 nm illumination, the photocurrent is negative, which is similar to other results induced by the PV effect. 35,36 However, the photocurrent becomes positive under infrared (IR) 1550 nm illumination, and the polarity is reversed, implying that the photoresponse could be charged by a new physical mechanism when the light irradiation is changed from 405 to 1550 nm wavelength. Figure 2d further presents the dynamic photoresponse behaviors of the heterojunction under 405 and 1550 nm irradiation.…”

Defect Passivation and Energy Level Modulation of CsPbBr2I QDs for High‐Detectivity and Stable Photodetectors

“…R A can be calculated by R A = I photo /P , where I photo ( I photo = I light −I dark ) denotes to the photocurrent and P is the incident light intensity. [ 34 ] The 5%KCQDs PDs possess the most excellent responsivity of 0.375 A W −1 , which is three times of the CQDs PDs. When current noise assumes only come from dark current, D * can be expressed as the formula of D* = R A / (2 qJ d ) 1/2 , where q is the elementary charge and J d is the dark current density.…”

Disentangling the Role of the SnO Layer on the Pyro‐Phototronic Effect in ZnO‐Based Self‐Powered Photodetectors

“…Among the various energy detection systems, presently, ultraviolet-visible (UV-Vis) self-powered photodetectors (PDs) have found widespread application in wireless control systems/communication, [1,2] biological/chemical analysis [3,4] visual-image Self-powered photodetectors (PDs) have been recognized as one of the developing trends of next-generation optoelectronic devices. Herein, it is shown that by introducing a thin layer of SnO film between the Si substrate and the ZnO film, the self-powered photodetector Al/Si/SnO/ZnO/ITO exhibits a stable and uniform violet sensing ability with high photoresponsivity and fast response.…”