Self-powered photodetector for ultralow power density UV sensing. (April 2022)

• Record Type: Journal Article
• Authors: Meng, Jianping; Li, Qi; Huang, Jing; Pan, Caofeng; Li, Zhou
• Is Part Of: Nano today. Volume 43(2022)
• Publication Date: 2022-04
• Subjects: Self-powered -- Localized surface plasmon resonance -- Pyro-phototronic effect -- Photodetector; Nanotechnology -- Periodicals; Nanosciences -- Périodiques; 620.505
• DOI: 10.1016/j.nantod.2022.101399
• Languages: English
• ISSNs: 1748-0132

Abstract

Highlights: Pyro-phototronic effect enhanced by LSPR is utilized to design a self-powered UV photodetector. Responsivity and detectivity attain 0.485 mA/W and 27.49 × 10 10 Jones for UV light with the power density of 68 nW/cm 2 . The responsivity and detectivity show significant enhancement by decorating Au NPs on the surface of ZnO NWs. The present study offers a practical approach to improve the performance of photodetector with other nanomaterial systems. Graphical Abstract: ga1 Abstract: Ultralow power density UV sensing is crucial to application in military and civilian fields. However, it is still confronted with a low signal-to-noise ratio and long response/recovery time. Here, we report a self-powered photodetector based on the Schottky junction of Au NPs@ZnO NWs, which can detect 325 nm light with the power density of 68 nW/cm 2, by using pyro-phototronic effect enhanced by localized surface plasmon resonance (LSPR). Under the illumination of 325 nm with the power density of 68 nW/cm 2, responsivity of photodetector dramatically enhances from 0 to 0.485 mA/W after decorating Au NPs, detectivity is boosted from 0 to 27.49 × 10 10 Jones. The responsivity and detectivity of self-powered photodetector show significant enhancement of over 3290% and over 3298% under the illumination of 325 nm light with the power density of 170 nW/cm 2 . The fast recovery ensure detection can be finished within 12 ms. The coupled effect of pyroelectric effect and LSPR provides a guideline to design a high-performance photodetector using other nanomaterials.