Threshold voltage roll-off modelling of bilayer graphene field-effect transistors

An analytical model is presented for threshold voltage roll-off of double gate bilayer graphene field-effect transistors. To this end, threshold voltage models of short- and long-channel states have been developed. In the short-channel case, front and back gate potential distributions have been mode...

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Bibliographic Details
Published in:Semiconductor science and technology 2013-12, Vol.28 (12), p.125020
Main Authors: Saeidmanesh, M, Ismail, Razali, Khaledian, M, Karimi, H, Akbari, E
Format: Article
Language:English
Subjects:
Applied sciences
bilayer graphene
Electronics
Exact sciences and technology
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
surface potential
threshold voltage
threshold voltage roll-off
Transistors
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Summary:An analytical model is presented for threshold voltage roll-off of double gate bilayer graphene field-effect transistors. To this end, threshold voltage models of short- and long-channel states have been developed. In the short-channel case, front and back gate potential distributions have been modelled and used. In addition, the tunnelling probability is modelled and its effect is taken into consideration in the potential distribution model. To evaluate the accuracy of the potential model, FlexPDE software is employed with proper boundary conditions and a good agreement is observed. Using the proposed models, the effect of several structural parameters on the threshold voltage and its roll-off are studied at room temperature.
ISSN:0268-1242
1361-6641
DOI:10.1088/0268-1242/28/12/125020