Influence of metal contacts and charge inhomogeneity on transport properties of graphene near the neutrality point

P. Blake; R. Yang; S. V. Morozov; F. Schedin; L. A. Ponomarenko; A. A. Zhukov; R. R. Nair; I. V. Grigorieva; K. S. Novoselov; A. K. Geim

doi:10.1016/j.ssc.2009.02.039

Influence of metal contacts and charge inhomogeneity on transport properties of graphene near the neutrality point

P. Blake, R. Yang, S. V. Morozov, F. Schedin, L. A. Ponomarenko, A. A. Zhukov, R. R. Nair, I. V. Grigorieva, K. S. Novoselov, A. K. Geim

Research output: Contribution to journal › Article › peer-review

Abstract

There is an increasing amount of literature concerning electronic properties of graphene close to the neutrality point. Many experiments continue using the two-probe geometry or invasive contacts or do not control samples' macroscopic homogeneity. We believe that it is helpful to point out some problems related to such measurements. By using experimental examples, we illustrate that the charge inhomogeneity induced by spurious chemical doping or metal contacts can lead to large systematic errors in assessing graphene's transport properties and, in particular, its minimal conductivity. The problems are most severe in the case of two-probe measurements where the contact resistance is found to strongly vary as a function of gate voltage. © 2009 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	1068-1071
Number of pages	3
Journal	Solid State Communications
Volume	149
Issue number	27-28
DOIs	https://doi.org/10.1016/j.ssc.2009.02.039
Publication status	Published - Jul 2009

Keywords

A. Graphene
B. Transport properties
C. Contact phenomena
D. Doping

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10.1016/j.ssc.2009.02.039

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title = "Influence of metal contacts and charge inhomogeneity on transport properties of graphene near the neutrality point",

abstract = "There is an increasing amount of literature concerning electronic properties of graphene close to the neutrality point. Many experiments continue using the two-probe geometry or invasive contacts or do not control samples' macroscopic homogeneity. We believe that it is helpful to point out some problems related to such measurements. By using experimental examples, we illustrate that the charge inhomogeneity induced by spurious chemical doping or metal contacts can lead to large systematic errors in assessing graphene's transport properties and, in particular, its minimal conductivity. The problems are most severe in the case of two-probe measurements where the contact resistance is found to strongly vary as a function of gate voltage. {\textcopyright} 2009 Elsevier Ltd. All rights reserved.",

keywords = "A. Graphene, B. Transport properties, C. Contact phenomena, D. Doping",

author = "P. Blake and R. Yang and Morozov, {S. V.} and F. Schedin and Ponomarenko, {L. A.} and Zhukov, {A. A.} and Nair, {R. R.} and Grigorieva, {I. V.} and Novoselov, {K. S.} and Geim, {A. K.}",

note = "Graphene Week 2008 International Conference, Trieste, ITALY, 2008",

year = "2009",

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doi = "10.1016/j.ssc.2009.02.039",

language = "English",

volume = "149",

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journal = "Solid State Communications",

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TY - JOUR

T1 - Influence of metal contacts and charge inhomogeneity on transport properties of graphene near the neutrality point

AU - Blake, P.

AU - Yang, R.

AU - Morozov, S. V.

AU - Schedin, F.

AU - Ponomarenko, L. A.

AU - Zhukov, A. A.

AU - Nair, R. R.

AU - Grigorieva, I. V.

AU - Novoselov, K. S.

AU - Geim, A. K.

N1 - Graphene Week 2008 International Conference, Trieste, ITALY, 2008

PY - 2009/7

Y1 - 2009/7

N2 - There is an increasing amount of literature concerning electronic properties of graphene close to the neutrality point. Many experiments continue using the two-probe geometry or invasive contacts or do not control samples' macroscopic homogeneity. We believe that it is helpful to point out some problems related to such measurements. By using experimental examples, we illustrate that the charge inhomogeneity induced by spurious chemical doping or metal contacts can lead to large systematic errors in assessing graphene's transport properties and, in particular, its minimal conductivity. The problems are most severe in the case of two-probe measurements where the contact resistance is found to strongly vary as a function of gate voltage. © 2009 Elsevier Ltd. All rights reserved.

AB - There is an increasing amount of literature concerning electronic properties of graphene close to the neutrality point. Many experiments continue using the two-probe geometry or invasive contacts or do not control samples' macroscopic homogeneity. We believe that it is helpful to point out some problems related to such measurements. By using experimental examples, we illustrate that the charge inhomogeneity induced by spurious chemical doping or metal contacts can lead to large systematic errors in assessing graphene's transport properties and, in particular, its minimal conductivity. The problems are most severe in the case of two-probe measurements where the contact resistance is found to strongly vary as a function of gate voltage. © 2009 Elsevier Ltd. All rights reserved.

KW - A. Graphene

KW - B. Transport properties

KW - C. Contact phenomena

KW - D. Doping

U2 - 10.1016/j.ssc.2009.02.039

DO - 10.1016/j.ssc.2009.02.039

M3 - Article

SN - 0038-1098

VL - 149

SP - 1068

EP - 1071

JO - Solid State Communications

JF - Solid State Communications

IS - 27-28

ER -

Influence of metal contacts and charge inhomogeneity on transport properties of graphene near the neutrality point

Abstract

Keywords

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