Highly Uniform, Self‐Assembled AlGaN Nanowires for Self‐Powered Solar‐Blind Photodetector with Fast‐Response Speed and High Responsivity

Abstract

Searching for power‐independent, compact, and highly environment‐sensitive photodetectors is a critical step towards the realization of next‐generation energy‐efficient and sustainable integrated optoelectronic systems. Particularly, the deep ultraviolet (UV) band, which has large photon energy, is extremely suitable for environment monitoring and invisible light communication application. Herein, the demonstration of self‐powered deep UV solar‐blind photodetectors in a photoelectrochemical (PEC) cell configuration is reported, adopting wide bandgap n‐type aluminum gallium nitride (AlGaN) nanowires as photoelectrode. After decorating nanowires with noble metal ruthenium (Ru), the constructed solar‐blind PEC photodetectors exhibited excellent responsivity of 48.8 mA W‐1, fast response speed (rise time of 83 ms and decay time of 19 ms) with large photocurrent density of 55 μA cm‐2 at 254 nm illumination. Such superior performance can be attributed to, firstly and foremost, the successful synthesis of highly uniform and defect‐free n‐type AlGaN nanowires which ensures efficient photogeneration via effective light‐harvesting, and secondly, the boosted carrier separation and collection efficiency through Ru decoration. This novel nanoarchitecture enables deep UV photodetection to work stably with low energy consumption, intriguingly, opening the possibility for the development of high‐performance PEC photodetectors based on group III‐nitride semiconductors covering the entire spectral range from infrared to deep UV.

Flexible Self‐Powered Electrochemical Photodetector Functionalized by Multilayered Tantalum Diselenide Nanocrystals

“…Then the redox molecule is reduced again to reproduce hydroxide ions at the platinum electrode (e − + OH * → OH − ). [36] Linear sweep voltammetry (LSV) curves of TaSe 2 NCs in 0. The P ph is gradually increasing with the illumination intensity because P ph is directly proportional to the P ϴ , where ϴ is the parameter related to the recombination process of the carrier and P is the power intensity.…”

A Self-Powered Transparent Photodetector Based on Detached Vertical (In,Ga)N Nanowires with 360° Omnidirectional Detection for Underwater Wireless Optical Communication

“…Self-powered PD is an essential part of a photoelectric sensing and communication system, which can continuously work without additional power sources [11][12][13]. Due to the outstanding advantages of eco-friendly, low cost and simple fabrication processes, self-powered photoelectrochemical (PEC) PDs have attracted extensive attention [12,14,15]. In another aspect, transparent optoelectronic devices provide many novel functions and have the potential for many applications, such as wearable intelligent electronics, imaging device, etc.…”

Self‐Powered and Spectrally Distinctive Nanoporous Ga2O3/GaN Epitaxial Heterojunction UV Photodetectors

“…Several groups recently demonstrated self‐powered heterojunction UV PDs. [ 22–24 ] Chen et al [ 25 ] reported a self‐powered PD based on NiO and a ferroelectric (FE) material (Pb 0.95 La 0.54 Ti 0.46 O 3 ) with a responsivity of 0.18 mA W −1 and a low dark current of 1.3 pA. The device performance enhancement was mainly due to the combined FE depolarization field and the built‐in field.…”