Varistor characteristics of a nano-device containing graphene and oxidized graphene: Verification by DFT + NEGF

2014/10/01 by Ghavami, Badie, Rastkar-Ebrahimzadeh, Alireza
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)

paper · doi:10.48550/arxiv.1410.0285

Abstract

Electron transport and quantum conductance through an armchair graphene and its oxidized graphene- containing form were investigated by the density functional theory (DFT) method and the implementation of the non-equilibrium Green function (NEGF) approach. The computed I-V_b(current as a function of bias voltage) characteristic of the studied systems showed the tunneling phenomenon in bias and gate voltages considered. Along with the transport properties, electronic properties including density of states (DOS) were calculated in the studied systems. A close examination of the results showed that the I-V_b curve for graphene behaved I∝ V_be^λV_b like at some bias voltages, while for the oxidized graphene-containing form, its trend was the same as that of a Voltage Dependent Resistor (VDR-VARiable resISTOR), I∝ V_b^β, at the whole range of the applied bias.

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