UV photodetector based on polycrystalline SnO2 nanotubes by electrospinning with enhanced performance
| Autor: | Hui Liu, Jinshou Wang, Wenxiu Huang, Li Tian, Shenghui Zhang, Yaohua Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Nanotube
Materials science Photodetector Nanoparticle Bioengineering 02 engineering and technology 010402 general chemistry medicine.disease_cause 01 natural sciences medicine General Materials Science Photocurrent business.industry Schottky diode General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics Electrospinning 0104 chemical sciences Modeling and Simulation Optoelectronics 0210 nano-technology business Ultraviolet Dark current |
| Zdroj: | Journal of Nanoparticle Research. 20 |
| ISSN: | 1572-896X 1388-0764 |
| DOI: | 10.1007/s11051-018-4440-y |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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