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

Miao Zhu; Li Zhang; Xinming Li; Yijia He; Xiao Li; Fengmei Guo; Xiaobei Zang; Kunlin Wang; Dan Xie; Xuanhua Li; Bingqing Wei; Hongwei Zhu

doi:10.1039/c5ta00702j

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

Miao Zhu
, Li Zhang
, Xinming Li
, Yijia He
, Xiao Li
, Fengmei Guo
, Xiaobei Zang
, Kunlin Wang
, Dan Xie
, Xuanhua Li
, Bingqing Wei
, Hongwei Zhu

School of Materials Sience and Engineering

Tsinghua University
National Center for Nanoscience and Technology
Northwestern Polytechnical University Xian
University of Delaware

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

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.

Original language	English
Pages (from-to)	8133-8138
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	3
Issue number	15
DOIs	https://doi.org/10.1039/c5ta00702j
State	Published - 21 Apr 2015

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10.1039/c5ta00702j

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@article{c54705b98cd14bc8becd563094b97271,

title = "TiO2 enhanced ultraviolet detection based on a graphene/Si Schottky diode",

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.",

author = "Miao Zhu and Li Zhang and Xinming Li and Yijia He and Xiao Li and Fengmei Guo and Xiaobei Zang and Kunlin Wang and Dan Xie and Xuanhua Li and Bingqing Wei and Hongwei Zhu",

note = "Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2015.",

year = "2015",

month = apr,

day = "21",

doi = "10.1039/c5ta00702j",

language = "英语",

volume = "3",

pages = "8133--8138",

journal = "Journal of Materials Chemistry A",

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TY - JOUR

T1 - TiO2 enhanced ultraviolet detection based on a graphene/Si Schottky diode

AU - Zhu, Miao

AU - Zhang, Li

AU - Li, Xinming

AU - He, Yijia

AU - Li, Xiao

AU - Guo, Fengmei

AU - Zang, Xiaobei

AU - Wang, Kunlin

AU - Xie, Dan

AU - Li, Xuanhua

AU - Wei, Bingqing

AU - Zhu, Hongwei

PY - 2015/4/21

Y1 - 2015/4/21

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/84926443524

U2 - 10.1039/c5ta00702j

DO - 10.1039/c5ta00702j

M3 - 文章

AN - SCOPUS:84926443524

SN - 2050-7488

VL - 3

SP - 8133

EP - 8138

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 15

ER -

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

Abstract

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