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Contact-induced negative differential resistance in short-channel graphene FETs

In this work, we clarify the physical mechanism for the phenomenon of negative output differential resistance (NDR) in short-channel graphene FETs (GFETs) through non-equilibrium Green's function (NEGF) simulations and a simpler semianalytical ballistic model that captures the essential physics. This NDR phenomenon is due to a transport mode bottleneck effect induced by the graphene Dirac point in the different device regions, including the contacts. NDR is found to occur only when the gate biasing produces an n-p-n or p-n-p polarity configuration along the channel, for both positive and negative drain-source voltage sweep. In addition, we also explore the impact on the NDR effect of contact-induced energy broadening in the source and drain regions and a finite contact resistance.

preprint2012arXivOpen access
Roberto GrassiTony LowAntonio GnudiGiorgio Baccarani
cond-mat.mes-hall
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Roberto GrassiTony LowAntonio GnudiGiorgio Baccarani

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