Systematic THz study of the substrate effect in limiting the mobility of graphene

Abstract We explore the substrate-dependent charge carrier dynamics of large area graphene films using contact-free non-invasive terahertz spectroscopy. The graphene samples are deposited on seven distinct substrates relevant to semiconductor technologies and flexible/photodetection devices. Using a...

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Autores principales:	Samantha Scarfe, Wei Cui, Adina Luican-Mayer, Jean-Michel Ménard
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d16c9fea2ae742f4836b0a8543002aa9
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spelling	oai:doaj.org-article:d16c9fea2ae742f4836b0a8543002aa92021-12-02T18:27:47ZSystematic THz study of the substrate effect in limiting the mobility of graphene10.1038/s41598-021-87894-52045-2322https://doaj.org/article/d16c9fea2ae742f4836b0a8543002aa92021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87894-5https://doaj.org/toc/2045-2322Abstract We explore the substrate-dependent charge carrier dynamics of large area graphene films using contact-free non-invasive terahertz spectroscopy. The graphene samples are deposited on seven distinct substrates relevant to semiconductor technologies and flexible/photodetection devices. Using a Drude model for Dirac fermions in graphene and a fitting method based on statistical signal analysis, we extract transport properties such as the charge carrier density and carrier mobility. We find that graphene films supported by substrates with minimal charged impurities exhibit an enhanced carrier mobility, while substrates with a high surface roughness generally lead to a lower transport performance. The smallest amount of doping is observed for graphene placed on the polymer Zeonor, which also has the highest carrier mobility. This work provides valuable guidance in choosing an optimal substrate for graphene to enable applications where high mobility is required.Samantha ScarfeWei CuiAdina Luican-MayerJean-Michel MénardNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Samantha Scarfe Wei Cui Adina Luican-Mayer Jean-Michel Ménard Systematic THz study of the substrate effect in limiting the mobility of graphene
description	Abstract We explore the substrate-dependent charge carrier dynamics of large area graphene films using contact-free non-invasive terahertz spectroscopy. The graphene samples are deposited on seven distinct substrates relevant to semiconductor technologies and flexible/photodetection devices. Using a Drude model for Dirac fermions in graphene and a fitting method based on statistical signal analysis, we extract transport properties such as the charge carrier density and carrier mobility. We find that graphene films supported by substrates with minimal charged impurities exhibit an enhanced carrier mobility, while substrates with a high surface roughness generally lead to a lower transport performance. The smallest amount of doping is observed for graphene placed on the polymer Zeonor, which also has the highest carrier mobility. This work provides valuable guidance in choosing an optimal substrate for graphene to enable applications where high mobility is required.
format	article
author	Samantha Scarfe Wei Cui Adina Luican-Mayer Jean-Michel Ménard
author_facet	Samantha Scarfe Wei Cui Adina Luican-Mayer Jean-Michel Ménard
author_sort	Samantha Scarfe
title	Systematic THz study of the substrate effect in limiting the mobility of graphene
title_short	Systematic THz study of the substrate effect in limiting the mobility of graphene
title_full	Systematic THz study of the substrate effect in limiting the mobility of graphene
title_fullStr	Systematic THz study of the substrate effect in limiting the mobility of graphene
title_full_unstemmed	Systematic THz study of the substrate effect in limiting the mobility of graphene
title_sort	systematic thz study of the substrate effect in limiting the mobility of graphene
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d16c9fea2ae742f4836b0a8543002aa9
work_keys_str_mv	AT samanthascarfe systematicthzstudyofthesubstrateeffectinlimitingthemobilityofgraphene AT weicui systematicthzstudyofthesubstrateeffectinlimitingthemobilityofgraphene AT adinaluicanmayer systematicthzstudyofthesubstrateeffectinlimitingthemobilityofgraphene AT jeanmichelmenard systematicthzstudyofthesubstrateeffectinlimitingthemobilityofgraphene
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Systematic THz study of the substrate effect in limiting the mobility of graphene

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