首页 | 本学科首页   官方微博 | 高级检索  
     


Influence of metal contacts and charge inhomogeneity on transport properties of graphene near the neutrality point
Authors: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
Affiliation:1. Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom;2. Institute for Microelectronics Technology, 142432 Chernogolovka, Russia;1. Department of Electrical Engineering and Computer Sciences, Massachusetts Institute of Technology, 77 Mass Avenue, Cambridge, MA 02139, United States;2. Programa de Pós-graduação em Ciência e Engenharia de Materiais, Universidade Federal de Sergipe, Avenida Marechal Rondon, São Cristóvão 49000-100, Brazil;3. Departmento de Química, Universidade Federal de Sergipe, Avenida Marechal Rondon, São Cristóvão 49000-100, Brazil;4. Departmento de Física, Universidade Federal do Ceará, PO Box 6030, Fortaleza, Ceará 60440-900, Brazil;1. Department of Physics & Astronomy, University of Western Ontario, London, ON, N6A 3K7, Canada;2. Centre of Advanced Materials and Biomaterials Research (CAMBR), University of Western Ontario, London, ON, N6A 5B7, Canada;3. Department of Chemistry, University of Western Ontario, London, ON, N6A 5B7, Canada;1. Materials Science and Engineering, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;2. Semiconductor and Dimensional Metrology, Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;3. Quantum Measurement, Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;4. Department of Physics, Georgetown University, Washington, DC 20057, USA;1. J. Heyrovsky Institute of Physical Chemistry of the Academy of Sciences of the Czech Republic, Dolej?kova 2155/3, 182 23 Praha, Czechia;2. Institute of Organic Chemistry and Biochemistry of the Academy of Sciences of the Czech Republic, Flemingovo náměstí 542/2, 166 10 Praha, Czechia
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.
Keywords:
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号