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High sensitivity ultraviolet detection based on three-dimensional graphene field effect transistors decorated with
Shasha Li1, Weijie Yin, Yuning Li
1School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China. dengtao@bjtu.edu.cn.
Nanoscale
|July 31, 2019
Summary
This study presents a novel three-dimensional ultraviolet photodetector using decorated tubular graphene field-effect transistors. The device achieves significantly enhanced photoresponsivity through titanium dioxide nanoparticle integration, offering tunable performance for advanced UV detection applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Graphene field-effect transistors (GFETs) show promise for photodetector applications.
- Enhancing light-matter interaction and charge separation is crucial for improving photodetector performance.
Purpose of the Study:
- To fabricate a three-dimensional (3D) ultraviolet (UV) photodetector with enhanced photoresponsivity.
- To investigate the effect of titanium dioxide (TiO2) nanoparticle decoration on a tubular GFET.
- To explore the tunability of the photodetector's performance.
Main Methods:
- Fabrication of a tubular GFET decorated with TiO2 nanoparticles.
- Utilizing the 3D architecture for optical resonance and increased light-matter interaction.
- Investigating the photogating effect caused by electron-hole pair generation and separation in TiO2 NPs.
Main Results:
- Achieved a photoresponsivity of 475.5 A W-1 at 325 nm, a significant improvement over undecorated GFETs and other reported UV photodetectors.
- Demonstrated that the 3D tubular structure enhances optical fields and light-matter interaction.
- Showed that photoresponsivity and response speed are tunable via gate and source-drain bias.
Conclusions:
- Decorating 3D graphene structures with semiconducting light harvesters like TiO2 NPs dramatically improves photodetector performance.
- The developed 3D GFET photodetector offers a promising platform for highly sensitive and tunable UV detection.
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