Issue 2, 2020

Large amplitude charge noise and random telegraph fluctuations in room-temperature graphene single-electron transistors

Abstract

We analyze the noise in liquid-gated, room temperature, graphene quantum dots. These devices display extremely large noise amplitudes. The observed noise is explained in terms of a charge noise model by considering fluctuations in the applied source–drain and gate potentials. We show that the liquid environment and substrate have little effect on the observed noise and as such attribute the noise to charge trapping/detrapping at the disordered graphene edges. The trapping/detrapping of individual charges can be tuned by gating the device, which can result in stable two-level fluctuations in the measured current. These results have important implications for the use of electronic graphene nanodevices in single-molecule biosensing.

Graphical abstract: Large amplitude charge noise and random telegraph fluctuations in room-temperature graphene single-electron transistors

Supplementary files

Article information

Article type
Paper
Submitted
06 Oct 2019
Accepted
04 Dec 2019
First published
05 Dec 2019

Nanoscale, 2020,12, 871-876

Large amplitude charge noise and random telegraph fluctuations in room-temperature graphene single-electron transistors

J. P. Fried, X. Bian, J. L. Swett, I. I. Kravchenko, G. A. D. Briggs and J. A. Mol, Nanoscale, 2020, 12, 871 DOI: 10.1039/C9NR08574B

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