Publication

Graphene negative differential resistance (GNDR) circuit with enhanced performance at room temperature

Mihai Adrian Ionescu, Arnaud Magrez, Antonios Bazigos, Laurent Syavoch Bernard, Pankaj Sharma
2015
Conference paper

Abstract

We propose and experimentally demonstrate a novel circuit based on graphene FETs (GFETs) showing excellent negative differential resistance (NDR) characteristics at room temperature. The proposed GNDR circuit exploits a closed loop connection of 1-GFET with a 2-GFET inverter, being highly scalable. The circuit is demonstrated using large-area chemical vapor deposition grown graphene and no doping step, which makes it compatible with silicon-based circuits. It exhibits improved peak-to-valley current ratio (PVCR), higher NDR level and wider voltage range over which NDR is valid, as compared to any previous graphene NDR. The NDR is uniquely tunable with the supply voltage as well as with back bias voltage. We show that PVCR of up to 2 can be achieved. In comparison to other NDR technologies, the graphene NDR has a high peak-current-density of the order of 1 mA/μm, which offers opportunities for designing circuits with high current drive. © 2015 IEEE.

Official source

https://infoscience.epfl.ch/record/210437?ln=en

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Ontological neighbourhood

Electrical engineering

Electronic engineering: Power electronics

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A voltage regulator is a system designed to automatically maintain a constant voltage. A voltage regulator may use a simple feed-forward design or may include negative feedback. It may use an electromechanical mechanism, or electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages. Electronic voltage regulators are found in devices such as computer power supplies where they stabilize the DC voltages used by the processor and other elements.

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Graphene (ˈgræfiːn) is an allotrope of carbon consisting of a single layer of atoms arranged in a hexagonal lattice nanostructure. The name is derived from "graphite" and the suffix -ene, reflecting the fact that the graphite allotrope of carbon contains numerous double bonds. Each atom in a graphene sheet is connected to its three nearest neighbors by σ-bonds and a delocalised π-bond, which contributes to a valence band that extends over the whole sheet.

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