Determination of the Thermal Noise Limit of Graphene Biotransistors
Abstract
To determine the thermal noise limit of graphene biotransistors, we have measured the complex impedance between the basal plane of single-layer graphene and an aqueous electrolyte. The impedance is dominated by an imaginary component but has a finite real component. Invoking the fluctuation-dissipation theorem, we determine the power spectral density of thermally driven voltage fluctuations at the graphene/electrolyte interface. The fluctuations have 1/fp dependence, with p = 0.75-0.85, and the magnitude of fluctuations scales inversely with area. Our results explain noise spectra previously measured in liquid-gated suspended graphene devices and provide realistic targets for future device performance. © 2015 American Chemical Society.
Date Published
Journal
Nano Letters
Volume
15
Issue
8
Number of Pages
5404-5407,
URL
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84939159050&doi=10.1021%2facs.nanolett.5b01788&partnerID=40&md5=f5323e696005149831b89cd09d53691d
DOI
10.1021/acs.nanolett.5b01788
Research Area
Group (Lab)
Paul McEuen Group
Funding Source
1450853
1450967