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Characterization of the CVD Graphene Monolayer as an Active Element of a One-Port Microwave Device
Characterization of the CVD Graphene Monolayer as an Active Element of a One-Port Microwave Device
- Source :
- IEEE Transactions on Electron Devices. 64:4340-4345
- Publication Year :
- 2017
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2017.
-
Abstract
- The one-port configuration of a microwave device is the simplest architecture for graphene ultrafast (photo-)resistors, (photo-)diodes, sensors, and photodetectors. Here, this configuration is realized by a segment of coplanar waveguide (CPW) loaded with a CVD graphene monolayer shorted to the ground. The magnitude and phase of the reflection coefficient ( ${S}_{11}$ parameter) measured in the $0.1~\div ~26$ GHz frequency range are presented for undisturbed structures as well as for structures illuminated by white light and electrostatically polarized with the backgate. A simple and robust de-embedding procedure based on the signal flow graph and allowing for a simultaneous extraction of the parameters characterizing the CPW segment and the graphene monolayer is proposed. The graphene impedance at microwave frequencies is in good agreement with the value of dc sheet resistance obtained from van der Pauw measurements. The back-gate voltage modulation is an efficient way to modulate both the dc sheet resistance and the impedance. In particular, the Dirac point can be achieved both at microwave frequencies and at dc. An equivalent circuit model consists of only the resistance and capacitance connected in parallel, because of good quality ohmic contacts and a negligible inductance as a result of low-current flow in high-resistance graphene samples.
- Subjects :
- Materials science
business.industry
Graphene
Coplanar waveguide
Analytical chemistry
Photodetector
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Electronic, Optical and Magnetic Materials
law.invention
Van der Pauw method
law
0103 physical sciences
Monolayer
Optoelectronics
Electrical and Electronic Engineering
010306 general physics
0210 nano-technology
business
Microwave
Sheet resistance
Graphene nanoribbons
Subjects
Details
- ISSN :
- 15579646 and 00189383
- Volume :
- 64
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Electron Devices
- Accession number :
- edsair.doi...........7b65c71a1439db3ec4669cf89a6dfe80
- Full Text :
- https://doi.org/10.1109/ted.2017.2742942