Theoretical study of quantum capacitance and associated delay in armchair-edge graphene nanoribbons

Hassan, Asif, Hossain, MD. Faruque, Rana, MD. Sohel and Kouzani, Abbas Z. 2015, Theoretical study of quantum capacitance and associated delay in armchair-edge graphene nanoribbons, International journal of computational materials science and engineering, vol. 4, no. 3, pp. 1-16, doi: 10.1142/S2047684115500190.

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Title Theoretical study of quantum capacitance and associated delay in armchair-edge graphene nanoribbons
Author(s) Hassan, Asif
Hossain, MD. Faruque
Rana, MD. Sohel
Kouzani, Abbas Z.ORCID iD for Kouzani, Abbas Z.
Journal name International journal of computational materials science and engineering
Volume number 4
Issue number 3
Start page 1
End page 16
Total pages 16
Publisher World Scientific Publishing
Place of publication Singapore
Publication date 2015-09
ISSN 2047-6841
Keyword(s) graphene nanoribbon
classical capacitance
quantum capacitance
gate delay
drift velocity
Summary This work presents a comprehensive investigation of the quantum capacitance and the associated effects on the carrier transit delay in armchair-edge graphene nanoribbons (A-GNRs) based on semi-analytical method. We emphasize on the realistic analysis of bandgap with taking edge effects into account by means of modified tight binding (TB) model. The results show that the edge effects have significant influence in defining the bandgap which is a necessary input in the accurate analyses of capacitance. The quantum capacitance is discussed in both nondegenerate (low gate voltage) and degenerate (high gate voltage) regimes. We observe that the classical capacitance limits the total gate (external) capacitance in the degenerate regime, whereas, quantum capacitance limits the external gate capacitance in the nondegenerate regime. The influence of gate capacitances on the gate delay is studied extensively to demonstrate the optimization of switching time. Moreover, the high-field behavior of a GNR is studied in the degenerate and nondegenerate regimes. We find that a smaller intrinsic capacitance appears in the channel due to high velocity carrier, which limits the quantum capacitance and thus limit the gate delay. Such detail analysis of GNRs considering a realistic model would be useful for the optimized design of GNR-based nanoelectronic devices.
Language eng
DOI 10.1142/S2047684115500190
Field of Research 091306 Microelectromechanical Systems (MEMS)
Socio Economic Objective 861503 Scientific Instruments
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, World Scientific Publishing
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