Terahertz detection by asymmetric dual grating gate bilayer graphene FETs with integrated bowtie antenna
Author(s)
Type
Journal Article
Abstract
An asymmetric dual-grating gate bilayer graphene-based field effect transistor (ADGG-GFET) with an integrated bowtie antenna was fabricated and its response as a Terahertz (THz) detector was experimentally investigated. The device was cooled down to 4.5 K, and excited at different frequencies (0.15, 0.3 and 0.6 THz) using a THz solid-state source. The integration of the bowtie antenna allowed to obtain a substantial increase in the photocurrent response (up to 8 nA) of the device at the three studied frequencies as compared to similar transistors lacking the integrated antenna (1 nA). The photocurrent increase was observed for all the studied values of the bias voltage applied to both the top and back gates. Besides the action of the antenna that helps the coupling of THz radiation to the transistor channel, the observed enhancement by nearly one order of magnitude of the photoresponse is also related to the modulation of the hole and electron concentration profiles inside the transistor channel by the bias voltages imposed to the top and back gates. The creation of local n and p regions leads to the formation of homojuctions (𝑛𝑝, 𝑝𝑛 or 𝑝𝑝+) along the channel that strongly affects the overall photoresponse of the detector. Additionally, the bias of both back and top gates could induce an opening of the gap of the bilayer graphene channel that would also contribute to the photocurrent.
Date Issued
2024-02-19
Date Acceptance
2024-02-14
Citation
Nanomaterials, 2024, 14 (4)
ISSN
2079-4991
Publisher
MDPI AG
Journal / Book Title
Nanomaterials
Volume
14
Issue
4
Copyright Statement
© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
License URL
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/38392756
PII: nano14040383
Subjects
2D materials
bowtie antenna
Chemistry
Chemistry, Multidisciplinary
drag effect
dual grating gate
FETs
graphene
Materials Science
Materials Science, Multidisciplinary
Nanoscience & Nanotechnology
Physical Sciences
Physics
Physics, Applied
plasmons
Science & Technology
Science & Technology - Other Topics
Technology
TRANSISTORS
Publication Status
Published
Coverage Spatial
Switzerland
Article Number
383
Date Publish Online
2024-02-02