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

被引：159

作者：

Blake, P. ^{[1
]}

Yang, R. ^{[1
]}

Morozov, S. V. ^{[1
,2
]}

Schedin, F. ^{[1
]}

Ponomarenko, L. A. ^{[1
]}

Zhukov, A. A. ^{[1
]}

Nair, R. R. ^{[1
]}

Grigorieva, I. V. ^{[1
]}

Novoselov, K. S. ^{[1
]}

Geim, A. K. ^{[1
]}

机构：

[1] Univ Manchester, Manchester Ctr Mesosci & Nanotechnol, Manchester M13 9PL, Lancs, England

[2] Russian Acad Sci, Inst Microelect Technol, Chernogolovka 142432, Russia

来源：

SOLID STATE COMMUNICATIONS | 2009年 / 149卷 / 27-28期

基金：

英国工程与自然科学研究理事会;

关键词：

Graphene; Transport properties; Contact phenomena; Doping; TRANSISTOR; SCATTERING; GAS;

D O I：

10.1016/j.ssc.2009.02.039

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1068 / 1071

页数：4

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