Photoconductive enhancement of single ZnO nanowire through localized Schottky effects
Abstract
We demonstrated the Au nanoparticle (NP) decoration as an effective way to enhance both photocurrent and photoconductive gain of single ZnO nanowire (NW) photodetectors (PDs) through localized Schottky effects. The enhancement is caused by the enhanced space charge effect due to the existence of the localized Schottky junctions under open-circuit conditions at the NW surfaces, leading to a more pronounced electron-hole separation effect. Since the band-bending under illumination varies relatively small for an Au NP-decorated ZnO NW, the decay of gain is less prominent with increased excitation power, demonstrating the feasibility for a PD to maintain a high gain under high-power illumination.
References
ZnO/Al2O3 core-shell nanorod arrays: growth, structural characterization, and luminescent properties
The effects of electron-hole separation on the photoconductivity of individual metal oxide nanowires
Citations
Non-stoichiometric W(18)O(49-x)S(x) nanowires for wide spectrum photosensors with high internal gain
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