Ultrahigh Responsivity UV Photodetector Based on Cu Nanostructure/ZnO QD Hybrid Architectures

Ming-Yu Li; Muni Yu; Dong Su; Jianbing Zhang; Shenglin Jiang; Jiang Wu; Qingping Wang; Sisi Liu

doi:10.1002/smll.201901606

Ultrahigh Responsivity UV Photodetector Based on Cu Nanostructure/ZnO QD Hybrid Architectures

Small. 2019 Jul;15(28):e1901606. doi: 10.1002/smll.201901606. Epub 2019 May 29.

Authors

Ming-Yu Li^{1

2}, Muni Yu¹, Dong Su¹, Jianbing Zhang^{1

2}, Shenglin Jiang^{1

2}, Jiang Wu^{3

4}, Qingping Wang⁵, Sisi Liu¹

Affiliations

¹ School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
² Shenzhen Huazhong University of Science and Technology Research Institute, Shenzhen, Guangdong, 518057, China.
³ Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054, China.
⁴ Department of Electronic and Electrical Engineering, University College London, WC1E6BT, London, UK.
⁵ Department of Physics, Department of Mechanical and Electronic Engineering, Hubei University of Education, Wuhan, Hubei, 430205, China.

PMID: 31140743
DOI: 10.1002/smll.201901606

Abstract

Strong near-surface electromagnetic field formed by collective oscillation of electrons on Cu nanostructure a shows a strong dependence on geometry, offering a promising approach to boost the light absorption of ZnO photoactive layers with enhanced plasmon scattering. Here, a facile way to fabricate UV photodetectors with tunable configuration of the self-assembled Cu nanostructures on ZnO thin films is reported. The incident lights are effectively confined in ZnO photoactive layers with the existence of the uplayer Cu nanostructures, and the interdiffusion of Cu atoms during fabrication of the Cu nanostructures can improve the carrier transfer in ZnO thin films. The optical properties of the hybrid architectures are successfully tailored over a control of the geometric evolution of the Cu nanostructures, resulting in significantly enhanced photocurrent and responsivity of 2.26 mA and 234 A W^-1 under a UV light illumination of 0.62 mW cm^-2 at 10 V, respectively. The photodetectors also exhibit excellent reproducibility, stability, and UV-visible rejection ratio (R_{370 nm} /R_{500 nm} ) of ≈370, offering an approach of high-performance UV photodetectors for practical applications.

Keywords: Cu nanostructures; UV photodetectors; excellent UV-visible rejection ratio; hybrid materials; self-assembly.

Abstract

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