研究目的
To present high-gain ultraviolet (UV) photodetectors based on vertically aligned ZnO nanorods (ZnO-NRs) array as light absorption antenna, prepared by hydrothermal method, and to explore the enhancement of device performance through filling the gaps of ZnO-NRs array with Au nanoparticles (Au-NPs).
研究成果
The study successfully demonstrated high-gain UV photodetectors using ZnO-NRs array as light absorption antenna, with enhanced performance through the incorporation of Au-NPs. The device achieved a high photo-to-dark current ratio and specific detectivity, attributed to the SPR effect and Schottky contact. Further improvements are possible by optimizing device configuration and Au-NPs filling.
研究不足
The response time of the photodetectors is relatively low, which could be improved by optimizing the ZnO seed layer composition, reducing the distance between electrodes, and improving charge carrier mobility.
1：Experimental Design and Method Selection:
Hydrothermal method was selected for synthesizing ZnO-NRs array due to its simplicity, low cost, and large resultant surface area.
2：Sample Selection and Data Sources:
ZnO-NRs array was synthesized on a glass substrate with Au electrodes and ZnO seed layer.
3：List of Experimental Equipment and Materials:
Equipment includes vacuum evaporation system for Au deposition, spin coater for ZnO seed layer, and hydrothermal reaction vessel for ZnO-NRs growth. Materials include zinc nitrate hexahydrate, hexamethylenetetramine, and Au nanoparticles.
4：Experimental Procedures and Operational Workflow:
ZnO seed layer was spin-coated and annealed, followed by hydrothermal growth of ZnO-NRs. Au-NPs were then deposited on the ZnO-NRs array.
5：Data Analysis Methods:
I-V characteristics were measured using a semiconductor characterization system (Keithley 4200-SCS).
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