Zero-Bias Visible to Near-Infrared Horizontal p-n-p TiO2 Nanotubes Doped Monolayer Graphene Photodetector

Zehua Huang; Chunhui Ji; Luhua Cheng; Jiayue Han; Ming Yang; Xiongbang Wei; Yadong Jiang; Jun Wang

doi:10.3390/molecules24101870

Zero-Bias Visible to Near-Infrared Horizontal p-n-p TiO₂ Nanotubes Doped Monolayer Graphene Photodetector

Molecules. 2019 May 15;24(10):1870. doi: 10.3390/molecules24101870.

Authors

Zehua Huang¹, Chunhui Ji², Luhua Cheng³, Jiayue Han⁴, Ming Yang⁵, Xiongbang Wei⁶, Yadong Jiang⁷, Jun Wang⁸

Affiliations

¹ School of Optoelectronic Science and Engineering State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China. jadeofuestc@126.com.
² School of Optoelectronic Science and Engineering State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China. jichunhui_uestc@163.com.
³ School of Optoelectronic Science and Engineering State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China. cheng.luhua@foxmail.com.
⁴ School of Optoelectronic Science and Engineering State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China. hanjiayue_uestc@163.com.
⁵ School of Optoelectronic Science and Engineering State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China. yangming932@163.com.
⁶ School of Optoelectronic Science and Engineering State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China. weixiongbang@uestc.edu.cn.
⁷ School of Optoelectronic Science and Engineering State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China. jiangyd@uestc.edu.cn.
⁸ School of Optoelectronic Science and Engineering State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China. wjun@uestc.edu.cn.

Abstract

We present a p-n-p monolayer graphene photodetector doped with titanium dioxide nanotubes for detecting light from visible to near-infrared (405 to 1310 nm) region. The built-in electric field separates the photo-induced electrons and holes to generate photocurrent without bias voltage, which allows the device to have meager power consumption. Moreover, the detector is very sensitive to the illumination area, and we analyze the reason using the energy band theory. The response time of the detector is about 30 ms. The horizontal p-n-p device is a suitable candidate in zero-bias optoelectronic applications.

Keywords: TiO2 nanotubes; broadband; graphene; p-n-p junction; zero-bias.

MeSH terms

Biosensing Techniques*
Graphite* / chemistry
Light*
Nanotubes* / chemistry
Nanotubes* / ultrastructure
Spectrum Analysis
Titanium* / chemistry

Substances

titanium dioxide
Graphite
Titanium

Abstract

MeSH terms

Substances

Grants and funding