UV photodetector based on polycrystalline SnO2 nanotubes by electrospinning with enhanced performance
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UV (ultraviolet) photodetectors with high performance have a wide range of applications such as environmental monitoring and water sterilization. Herein, we have demonstrated that the visible-blind UV photodetectors based on polycrystalline SnO2 nanotubes by electrospinning combined the advantages of low dark current and high photocurrent-to-dark current ratio. The optimized photodetector based on SnO2 nanotube film showed a strong rise in current amplitude; the photocurrent was 25.60 nA, about 850 times larger than the dark current of 0.03 nA, under a voltage as small as 1.0 V and 320 nm illumination at 75 μW/cm2. In addition, these devices presented improved characteristic on time responses. Investigations indicated that the features of high signal-to-noise ratio and relatively fast response speed are strongly relied upon the band-edge modulation along the axial direction of nanotube, where Schottky barriers are formed among the grain interfaces of polycrystalline SnO2 nanoparticles, together with the processes of oxygen adsorption/desorption in air. These results suggest that the polycrystalline SnO2 nanotube is a potential candidate for the fabrication of photodetector with low cost and high performance.
KeywordsSnO2 nanotube Polycrystalline Photodetector Electrospinning Sensors
This work was supported by the National Natural Science Foundation of China (nos. 21361009, 21363007, and 21175033) and the Foundation for PhD of Hubei University for Nationalities (MY2015B022, MY2015B023).
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Conflict of interest
The authors declare that they have no conflict of interest.
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