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ZnO纳米线紫外探测器的制备和快速响应性能的研究
Fabrication and fast photoresponse properties of ZnO nanowires photodetectors
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摘要: 一维ZnO纳米结构由于具有比表面积大、室温下具有大激子结合能等特点而受到广泛关注.但是如何实现纳米结构的器件一直是目前研究的一个挑战.文章通过水热方法,在玻璃衬底上实现了ZnO纳米线横向生长,并制备出基于ZnO纳米线的金属-半导体-金属紫外探测器.测量结果显示器件在365 nm处探测器的响应度达到5 A/W,并且制备的探测器在空气中对紫外光照具有快速的响应,其上升时间约4 s,下降时间约5 s,这与ZnO纳米线中的氧空位吸附和脱附水分子相关.Abstract: One-dimensional ZnO nanostructure is especially attractive because of its unique properties such as high surface-to-volume ratio and a large exciton binding energy, but how to put it into a device is still a challenge. In this article, we show that a novel lateral metal- semiconductor-metal ultraviolet detector composed of ZnO nanowires is fabricated on glass substrate by a single-step hydrothermal approach. The fabricated photodetector demonstrates that the response to UV illumination in air is fast, the rise time is about 4 s, and the fall time is about 5 s, which could be attributed to the fact that the adsorption and the desorption of water molecules in the air onto oxygen vacancy of the nanowire significantly influence the photoresponse.
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