Rutile Nanorod/Anatase Nanowire Junction Array as Both Sensor and Power Supplier for High-Performance, Self-Powered, Wireless UV Photodetector

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• 作者：Xin Yu ; Zhenhuan Zhao ; Jian Zhang ; Weibo Guo ; Jichuan Qiu ; Deshuai Li ; Zhou Li ; Xiaoning Mou ; Linlin Li ; Aixue Li and Hong Liu
• 刊名：Small
• 出版年：2016
• 出版时间：May 25, 2016
• 年：2016
• 卷：12
• 期：20
• 页码：2759-2767
• 全文大小：2544K
• ISSN：1613-6829

文摘

Self-powered UV photodetectors based on TiO₂ nanotree arrays have captured much attention in recent years because of their many advantages. In this work, rutile/anatase TiO₂ (R/A-TiO₂) heterostructured nanotree arrays are fabricated by assembling anatase nanowires as branches on rutile nanorods. External quantum efficiencies as high as 90% are reached at 325 nm. These high quantum efficiencies are related to the higher amount of light harvesting due to the larger surface area, the better separation ability of the photogenerated carriers by the rutile/anatase heterostructure, and the faster electron transport, related to the 1D nanostructure and lattice connection at the interface of the two kinds of TiO₂. Furthermore, a self-powered wireless UV photodetector is shown with excellent wireless detection performance. Such devices will enable significant advances for next-generation photodetection and photosensing applications.