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Open Access Highly Accessed Nano Express

A self-powered UV photodetector based on TiO2 nanorod arrays

Yanru Xie1, Lin Wei2, Guodong Wei1, Qinghao Li1, Dong Wang1, Yanxue Chen1*, Shishen Yan1, Guolei Liu1, Liangmo Mei1 and Jun Jiao34

Author Affiliations

1 School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China

2 School of Information Science and Engineering, Shandong University, Jinan, 250100, People's Republic of China

3 Department of Mechanical and Materials Engineering, Portland State University, P.O. Box 751, Portland, OR, 97207-0751, USA

4 Department of Physics, Portland State University, P.O. Box 751, Portland, OR, 97207-0751, USA

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Nanoscale Research Letters 2013, 8:188  doi:10.1186/1556-276X-8-188

Published: 23 April 2013

Abstract

Large-area vertical rutile TiO2 nanorod arrays (TNAs) were grown on F/SnO2 conductive glass using a hydrothermal method at low temperature. A self-powered ultraviolet (UV) photodetector based on TiO2 nanorod/water solid–liquid heterojunction is designed and fabricated. These nanorods offer an enlarged TiO2/water contact area and a direct pathway for electron transport simultaneously. By connecting this UV photodetector to an ammeter, the intensity of UV light can be quantified using the output short-circuit photocurrent without a power source. A photosensitivity of 0.025 A/W and a quick response time were observed. At the same time, a high photosensitivity in a wide range of wavelength was also demonstrated. This TNA/water UV detector can be a particularly suitable candidate for practical applications for its high photosensitivity, fast response, excellent spectral selectivity, uncomplicated low-cost fabrication process, and environment-friendly feature.

Keywords:
TiO2; Nanorod; Ultraviolet photodetector; Solid–liquid heterojunction