Theory of the suspended graphene varactor

We report the theory and design equations of the suspended graphene varactor, wherein device capacitance is tuned by the voltage controlled deflection of a suspended graphene membrane. A simple model based on large membrane deflection predicts a capacitor tuning range of 76%, with a membrane pull-in...

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Bibliographic Details
Published in:Applied physics letters 2012-10, Vol.101 (15)
Main Authors: AbdelGhany, M., Ledwosinska, E., Szkopek, T.
Format: Article
Language:English
Subjects:
Deflection
Electric potential
Graphene
Mathematical models
Membranes
Tuning
Varactors
Voltage
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Summary:We report the theory and design equations of the suspended graphene varactor, wherein device capacitance is tuned by the voltage controlled deflection of a suspended graphene membrane. A simple model based on large membrane deflection predicts a capacitor tuning range of 76%, with a membrane pull-in voltage tuneable from 1 V to 30 V. An intrinsic electric quality factor approaching 200 is predicted based on experimentally determined Young's modulus and sheet resistance.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4757991