Issue 15, 2015
From the journal:

Journal of Materials Chemistry A

TiO2 enhanced ultraviolet detection based on a graphene/Si Schottky diode†

Miao Zhu,ab   Li Zhang,a   Xinming Li,c   Yijia He,ab   Xiao Li,ab   Fengmei Guo,a   Xiaobei Zang,a   Kunlin Wang,a   Dan Xie,*d   Xuanhua Li,e   Bingqing Weief  and  Hongwei Zhu*ab  

* Corresponding authors

a School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
E-mail: hongweizhu@tsinghua.edu.cn

b Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China

c National Center for Nanoscience and Technology, Zhongguancun, Beijing 100190, China

d Tsinghua National Laboratory for Information Science and Technology (TNList), Institute of Microelectronics, Tsinghua University, Beijing 100084, China
E-mail: xiedan@tsinghua.edu.cn

e School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China

f Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA

Abstract

Graphene/Si has been proved to form a quality Schottky junction with high photoelectric conversion efficiency at AM 1.5. However, for the ultraviolet portion of the incident light, the photoelectric performance will degrade significantly due to severe absorption and recombination at the front surface. Herein, to realize enhanced ultraviolet detection with a graphene/Si diode, TiO2 nanoparticles (NPs, 3–5 nm) are synthesized and spin-coated on the graphene surface to improve the photoresponse in the ultraviolet region. According to our results, the conversion efficiency of the graphene/Si diode at 420 nm and 350 nm increases by 72.7% and 100% respectively with TiO2 coating. Then C−2–V measurements of both TiO2 and graphene/Si diode are performed to analyze the electronic band structure of the TiO2/graphene/Si system, based on which we finally present the enhancement mechanism of photodetection using TiO2 NPs.

Graphical abstract: TiO2 enhanced ultraviolet detection based on a graphene/Si Schottky diode

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Article information

DOI
https://doi.org/10.1039/C5TA00702J
Article type
Paper
Submitted
28 Jan 2015
Accepted
10 Mar 2015
First published
11 Mar 2015
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2015,3, 8133-8138

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TiO2 enhanced ultraviolet detection based on a graphene/Si Schottky diode

M. Zhu, L. Zhang, X. Li, Y. He, X. Li, F. Guo, X. Zang, K. Wang, D. Xie, X. Li, B. Wei and H. Zhu, J. Mater. Chem. A, 2015, 3, 8133 DOI: 10.1039/C5TA00702J

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