Probing charge scattering mechanisms in suspended graphene by varying its dielectric environment

被引:116
作者
Newaz, A. K. M. [1 ]
Puzyrev, Yevgeniy S. [1 ]
Wang, Bin [1 ]
Pantelides, Sokrates T. [1 ]
Bolotin, Kirill I. [1 ]
机构
[1] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA
基金
美国国家科学基金会;
关键词
BALLISTIC TRANSPORT; IMPURITY SCATTERING; MOBILITY;
D O I
10.1038/ncomms1740
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Graphene with high carrier mobility mu is required both for graphene-based electronic devices and for the investigation of the fundamental properties of Dirac fermions. An attractive approach to increase the mobility is to place graphene in an environment with high static dielectric constant kappa that would screen the electric field due to the charged impurities present near graphene's surface. Here we investigate the effect of the dielectric environment of graphene and study electrical transport in multi-terminal graphene devices suspended in liquids with kappa ranging from 1.9 to 33. For non-polar liquids (kappa<5), we observe a rapid increase of mu(kappa), with room-temperature mobility reaching similar to 60,000 cm(2)Vs(-1) for devices in anisole (kappa=4.3). We associate this trend with dielectric screening of charged impurities adsorbed on graphene. We observe much lower mobility mu similar to 20,000 cm(2)Vs(-1) for devices in polar liquids (kappa >= 18) and explain it by additional scattering caused by ions present in such liquids.
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页数:6
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