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

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 (R370 nm/R500 nm) of ≈370, offering an approach of high‐performance UV photodetectors for practical applications.

Improved Photoresponse of UV Photodetectors by the Incorporation of Plasmonic Nanoparticles on GaN Through the Resonant Coupling of Localized Surface Plasmon Resonance

“…In addition, the external quantum efficiency ( EQE ) that determines the ratio of photocurrent to the incident photon flux was determined as Eq. 4 [ 15 ]: where λ is the excitation wavelength (385 nm). Similarly, the EQE of bare GaN, Ag, and Au photodetectors were maximum at 0.03 mW mm −2 and then gradually decreased with the increased power as shown in Fig.…”

“…In addition, the external quantum efficiency (EQE) that determines the ratio of photocurrent to the incident photon flux was determined as Eq. 4 [15]:…”

“…At the same time, the plasmonic nanomaterials that induce the localized surface plasmon resonances (LSPR) due to the collective oscillation of conduction band electrons have been gaining considerable research attention as the promising candidates to achieve the improved performance of various photodetectors [6,14]. For example, the Cu nanostructure/ZnO quantum dots hybrid architecture exhibited the ultrahigh UV photoresponsivity due to the enhanced plasmon scattering by the Cu nanostructures in the ZnO photoactive layer [15]. To date, various UV photodetectors have been demonstrated by the modification of nanoscale surface properties of photoactive materials, i.e., wide bandgap semiconductors of GaN, ZnO, TiO 2 , and SiC, as well as by the integration of advanced nanomaterials such as metallic nanoparticles (NPs), two-dimensional materials, and quantum dots [16][17][18][19][20].…”

Enhanced Spatial Light Confinement of All Inorganic Perovskite Photodetectors Based on Hybrid Plasmonic Nanostructures

“…This suggested the limitation of the enhancement effect was 220 nm. The ability of the photocurrent generation under light excitation, responsivity (R S ), can be defined as: [40]…”

Systematic investigation on quad-metallic AgAuPdPt and tri-metallic AuPdPt NPs through the solid-state dewetting of quad-layer Ag/Au/Pd/Pt thin films on c-plane sapphire

“…However, the device performance with the chemically synthesized NPs has been somewhat hindered by the issues of impurity, durability and weak binding to substrate. The SSD approach can provide highly stable, pure and large scale-fabrication of various monometallic and multi-metallic alloy NPs [23]. The detailed study on the fabrication and characterizations of MNPs by the SSD can allow one to control the composition and morphology of NPs for the target applications, which however has not been explored for the high order MNPs up to now.…”