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Three-Dimensional Graphene Field-Effect Transistors as High-Performance Photodetectors
Tao Deng1, Zhaohao Zhang2, Yaxuan Liu1
1School of Electronic and Information Engineering , Beijing Jiaotong University , Beijing 100044 , China.
Nano Letters
|January 31, 2019
Summary
Researchers developed 3D tubular graphene field-effect transistors (GFETs) using a self-rolled-up method. These enhanced GFET photodetectors show significantly improved photoresponsivity across ultraviolet to terahertz frequencies.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Graphene possesses excellent electronic and optical properties, making it suitable for photodetectors.
- Planar (2D) graphene field-effect transistors (GFETs) suffer from limited photoresponsivity due to weak optical absorption.
- Enhancing light-graphene interaction is crucial for improving photodetector performance.
Purpose of the Study:
- To develop a novel method for fabricating three-dimensional (3D) GFETs.
- To enhance the photoresponsivity and spectral range of graphene-based photodetectors.
- To explore the potential of 3D GFETs for optoelectronic applications.
Main Methods:
- A self-rolled-up technique was employed to transform 2D buried-gate GFETs into 3D tubular GFETs.
- Fabrication of 3D tubular GFETs to create a resonant microcavity structure.
- Characterization of photodetection performance across various spectral regions.
Main Results:
- The 3D tubular GFETs exhibited significantly enhanced photoresponsivity compared to planar counterparts.
- Room-temperature photodetection was achieved in ultraviolet, visible, mid-infrared, and terahertz (THz) regions.
- Specific photoresponsivities of >1 A W-1 in UV/visible and 0.232 A W-1 at 3.11 THz were recorded.
- Electrical bandwidth exceeding 1 MHz was demonstrated.
Conclusions:
- The self-rolled-up method effectively creates 3D tubular GFETs with improved light-graphene interaction.
- 3D GFET photodetectors offer high photoresponsivity, broad spectral coverage, and high speed.
- These findings open new avenues for advanced 3D graphene optoelectronic devices and systems.
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