The hybrid metal/quantum dots (QDs) structures were synthesized and characterized with different thicknesses of silica shells by uncomplicated and typical methods. By engineering the shell thickness and Au nanoparticles (Au NPs) core size with shapes, the interaction between Au NPs and QDs could be adjusted flexibly to witness the energy transfer process thoroughly. The improvement of the emission intensity and the reduction in the PL lifetime with the appropriate thickness of silica layer were obtained. Likewise, the energy transfer efficiency between QDs donor-acceptor pairs was inferred as the dominance of larger QDs with hybrid structures. The quenching of QDs donors and the enhancement of QDs acceptors in PL emission intensity were determined by the different core-shell structures. Finally, as-prepared metal/silica/QDs structures have been explored for bio-imaging applications, leading to enhanced light absorption and sensitivity.
In this work, we present the enhancement of ultraviolet (UV) photodetection of Ag-ZnO thin film deposited by radio frequency magnetron sputtering. The surface morphological, optical, structural, and electrical properties of the deposited thin films were investigated by various characterization techniques. With this Ag-ZnO thin film structure and proper geometry of metal–semiconductor–metal (MSM) interdigitated structure design, photocurrent enhancement has been accomplished. MSM-photodetectors (PDs) using structures of Ag-ZnO gave a 30 times higher magnitude photocurrent at 340 nm of the wavelength. Plasmon-induced hot electrons contributed to improved spectral response to the UV region, while absorption and scattering effect enhanced broadband improvement to a response in the VIS–IR spectrum range. The improvement of Ag-ZnO PD in comparison with ZnO is attributed to the surface plasmon effect using Ag nanodisks. These results indicate that Ag-ZnO thin films can serve as excellent ultraviolet-PD and a very promising candidate for practical applications.
Plasmon field-effect transistor is a hybrid device using nanostructures to detect the plasmonic energy. This device efficiently transfers plasmonic hot electrons from the metal nanostructures to the semiconductor. The transported hot electrons to the electron channel increases transistor drain current. We investigate the efficiency of plasmonic hot carrier harvesting between metal and semiconductor. We analyzed the effect of gold nanoparticle (NP) density and distribution on plasmon FET spectral response. Then, we studied electric field-assisted hot electron transfer and transport using different device structures. The position of plasmonic structures plays an important role in plasmonic energy detection efficiency because the gradient of electric field seen by induced hot electrons varies depending on the distance between drain and source. Both the experimental and simulation results confirm that by fabricating the gold NPs close to source the spectral response increases by 31% in comparison with having gold NPs close to the drain. Our simulation and experimental data suggest important design considerations to improve hot electron collection and conversion using metallic nanostructures for plasmonic energy harvesting.
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