Fabrication of Au nanoparticle/double-walled carbon nanotube film/TiO₂ nanotube array/Ti heterojunctions with low resistance state for broadband photodetectors

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• 作者：Yan Chen^a ; Guowei Zhang^b ; Zhanmin Dong^b ; Jinquan Wei^c ; Jia-Lin Zhu^b ; Jia-Lin Sun^b ; ^d ; ^{jlsun@tsinghua.edu.cn}
• 关键词：Broadband photodetector ; TiO2 nanotube array ; Au nanoparticles ; Carbon nanotube film ; Multilayer heterojunction structure ; Vacuum
• 刊名：Physica B: Condensed Matter
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：508
• 期：Complete
• 页码：1-6
• 全文大小：833 K
• 卷排序：508

文摘

A broadband photodetector based on Au nanoparticle/double-walled carbon nanotube film/TiO2 nanotube array /Ti multilayer heterojunction structures has been fabricated. A pre-electroforming process at a voltage bias of 35 V was used to switch the photodetector from a high resistance state to a low resistance state. At a voltage bias of 1 V under 532-nm laser illumination in air, the photoresponsivity of the device reached 15.41 mA W−1, which is enhanced by approximately 1.91 times when compared with that of device before deposition of Au nanoparticles. In addition, in a vacuum under a voltage bias of 1 V, the photoresponsivity of the device reached 23.29 mA W−1 and 6.85 mA W−1 at 532 nm and 1064 nm, respectively. The surface plasmon polaritons of the Au nanoparticles allowed extension of the sensitivity of the photosensitive regions into the mid-infrared range. The experimental results show that the device photoresponsivity reached 2.26 mA W−1 at a voltage bias of 1 V under 10.6-µm laser illumination in air.