Efficient ultraviolet photodetectors based on TiO2 nanotube arrays with tailored structures
Efficient ultraviolet photodetectors based on TiO2 nanotube arrays with tailored structures
复制标题
基于具有定制结构的 TiO2 纳米管阵列的高效紫外光电探测器
DOI：
10.1039/c5ra05861a
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Yang, Zuobao
中科院分区：
文献类型：
--
作者：
Wang, Lianbo;Yang, Weiyou;Yang, Zuobao
近年来，基于TiO 2半导体的紫外光探测器因其在环境和生物研究、光通信、天文调查和导弹发射探测等方面的广泛应用而引起了人们的广泛关注。然而，在实现高效UV光电探测器方面仍然存在与材料和制造相关的障碍。本文报道了基于高度有序的TiO2纳米管阵列（TNAs）的高效紫外光探测器的研究。TNA通过两步阳极氧化制备，具有定制的管长度和壁厚度，然后移植到透明FTO衬底上以构建前照式光电探测器。在350 nm的紫外光照射下，器件的光电流、光暗电流比和响应度分别达到1395 μA、10730和176.3 A W−1，具有良好的稳定性和波长选择性（45 μW cm−1），表明它们在高效紫外光探测器中有着良好的应用前景。
Recently, ultraviolet (UV) photodetectors based on TiO2 semiconductors have attracted intensive attention, due to their wide applications in environmental and biological research, optical communication, astronomical investigations and missile launch detection. However, there still remain material- and fabrication-related obstacles in realizing highly efficient UV photodetectors. Here, we reported the exploration of the efficient UV photodetectors based on the highly ordered TiO2 nanotube arrays (TNAs). The TNAs were prepared by a two-step anodic oxidation with tailored tube lengths and wall thicknesses, and then transplanted to a transparent FTO substrate to construct a front-illuminated photodetector. The as-assembled photodetectors exhibit a satisfactory stability and wavelength selectivity with a high photocurrent, photo-to-dark current ratio and responsivity up to 1395 μA, 10730 and 176.3 A W−1 under the UV illumination of 350 nm (45 μW cm−1) at a given bias of 2 V with TiO2 tube length of 14.7 μm, respectively, suggesting their promising applications in efficient UV photodetectors.