Graphene FETs with high and low mobilities have universal temperature-dependent properties

Gosling, Jonathan; Morozov, Sergey V.; Vdovin, Evgenii E.; Greenaway, Mark T.; Khanin, Yurii N.; Kudrynskyi, Zakhar; Patanè, Amalia; Eaves, Laurence; Turyanska, Lyudmila; Fromhold, T. Mark; Makarovsky, Oleg

Abstract

We use phenomenological modelling and detailed experimental studies of charge carrier transport to investigate the dependence of the electrical resistivity,ρ, on gate voltage,Vg, for a series of monolayer graphene field effect transistors with mobilities,μ, ranging between 5000 and 250 000 cm2V-1s-1at low-temperature. Our measurements over a wide range of temperatures from 4 to 400 K can be fitted by the universal relationμ=4/eδnmaxfor all devices, whereρmaxis the resistivity maximum at the neutrality point andδnis an 'uncertainty' in the bipolar carrier density, given by the full width at half maximum of the resistivity peak expressed in terms of carrier density,n. This relation is consistent with thermal broadening of the carrier distribution and the presence of the disordered potential landscape consisting of so-called electron-hole puddles near the Dirac point. To demonstrate its utility, we combine this relation with temperature-dependent linearised Boltzmann transport calculations that include the effect of optical phonon scattering. This approach demonstrates the similarity in the temperature-dependent behaviour of carriers in different types of single layer graphene transistors with widely differing carrier mobilities. It can also account for the relative stability, over a wide temperature range, of the measured carrier mobility of each device.

Citation

Gosling, J., Morozov, S. V., Vdovin, E. E., Greenaway, M. T., Khanin, Y. N., Kudrynskyi, Z., …Makarovsky, O. (2023). Graphene FETs with high and low mobilities have universal temperature-dependent properties. Nanotechnology, 34(12), Article 125702. https://doi.org/10.1088/1361-6528/aca981

• Journal Article Type: Article
• Acceptance Date: Dec 7, 2022
• Online Publication Date: Jan 6, 2023
• Publication Date: Jan 6, 2023
• Deposit Date: Dec 9, 2022
• Publicly Available Date: Jan 6, 2023
• Journal: Nanotechnology
• Print ISSN: 0957-4484
• Electronic ISSN: 1361-6528
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 34
• Issue: 12
• Article Number: 125702
• DOI: https://doi.org/10.1088/1361-6528/aca981
• Keywords: Electrical and Electronic Engineering; Mechanical Engineering; Mechanics of Materials; General Materials Science; General Chemistry; Bioengineering
• Public URL: https://nottingham-repository.worktribe.com/output/14600988
• Publisher URL: https://iopscience.iop.org/article/10.1088/1361-6528/aca981