Supersensitive, Ultrafast, and Broad-Band Light-Harvesting Scheme Employing Carbon Nanotube/TiO2 Core鈥揝hell Nanowire Geometry

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• 作者：Chia-Yang Hsu ; Der-Hsien Lien ; Sheng-Yi Lu ; Cheng-Ying Chen ; Chen-Fang Kang ; Yu-Lun Chueh ; Wen-Kuang Hsu ; Jr-Hau He
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：August 28, 2012
• 年：2012
• 卷：6
• 期：8
• 页码：6687-6692
• 全文大小：337K
• 年卷期：v.6,no.8(August 28, 2012)
• ISSN：1936-086X

文摘

We demonstrate a novel, feasible strategy for practical application of one-dimensional photodetectors by integrating a carbon nanotube and TiO₂ in a core鈥搒hell fashion for breaking the compromise between the photogain and the response/recovery speed. Radial Schottky barriers between carbon nanotube cores and TiO₂ shells and surface states at TiO₂ shell surface regulate electron transport and also facilitate the separation of photogenerated electrons and holes, leading to ultrahigh photogain (G = 1.4 脳 10⁴) and the ultrashort response/recovery times (4.3/10.2 ms). Additionally, radial Schottky junction and defect band absorption broaden the detection range (UV鈥搗isible). The concept using metallic core oxide鈥搒hell geometry with radial Schottky barriers holds potential to pave a new way to realize nanostructured photodetectors for practical use.

Keywords:

hell&qsSearchArea=searchText">core鈭抯hell; TiO₂; carbon nanotube; photodetector; photoresponse time