Article Terahertz Detection by Asymmetric Dual Grating Gate Bilayer Graphene FETs with Integrated Bowtie Antenna

E. Abidi ; A. Khan ; J. A. Delgado-Notario ; V. Clericó ; J. Calvo-Gallego ; T. Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; K. Watanabe SAMURAI ORCID (National Institute for Materials Science) ; T. Otsuji ; J. E. Velázquez ; Y. M. Meziani

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E. Abidi, A. Khan, J. A. Delgado-Notario, V. Clericó, J. Calvo-Gallego, T. Taniguchi, K. Watanabe, T. Otsuji, J. E. Velázquez, Y. M. Meziani. Terahertz Detection by Asymmetric Dual Grating Gate Bilayer Graphene FETs with Integrated Bowtie Antenna. Nanomaterials. 2024, 14 (4), 383.
SAMURAI

Description:

(abstract)

We have fabricated an asymmetric dual-grating gate bilayer graphene-based field effect 1 transistor (ADGG-GFET) with an integrated bowtie antenna. We characterized it at 4.5 K under THz 2 excitation, at different frequencies (0.15, 0.3 and 0.6 THz). The integration of the bowtie antenna 3 allows to obtain a significant increase in the photocurrent response (up to 8 nA) of the device at the 4 three frequencies in comparison to transistors with no antenna (1 nA). The photocurrent increase was 5 observed for all the studied values of the bias voltage applied to both the top and back gates. This 6 behavior was explained as due to the creation of regions of different carrier types (electrons or holes) 7 and concentration profiles (np, pn or pp+) along the channel that are modulated by the transistor 8 biasing. The biasing of both back and top gates could induce an opening of the gap of the bilayer 9 graphene channel leading to the observed behavior of the photocurrent.

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Keyword: Asymmetric dual-grating gate, Terahertz detector, photocurrent response

Date published: 2024-02-19

Publisher: MDPI AG

Journal:

  • Nanomaterials (ISSN: 20794991) vol. 14 issue. 4 383

Funding:

  • Spanish Agencia Estatal de Investigación PID2021-126483OB-I00
  • Spanish Agencia Estatal de Investigación PID2022-136869NB-C33
  • Universidad de Salamanca Research Program PIC2-2021-02
  • Consejería de Educación, Junta de Castilla y León SA121P20
  • Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital of the Generalitat Valenciana MFA/2022/056
  • Cooperative Research Project of the Research Institute of Electrical Communication, Tohoku University
  • JSPS KAKENHI 21H04546

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.3390/nano14040383

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Updated at: 2025-02-15 12:30:19 +0900

Published on MDR: 2025-02-15 12:30:19 +0900

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