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Research Paper

Applied Science and Convergence Technology 2019; 28(6): 226-228

Published online November 30, 2019


Copyright © The Korean Vacuum Society.

Charge Carrier Density Tuning of Graphene by Water Gating

Young-Jun Yu*

Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea

Correspondence to:yjyu@cnu.ac.kr

Received: November 18, 2019; Accepted: December 5, 2019

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-CommercialLicense (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution,and reproduction in any medium, provided the original work is properly cited.


In this work, the conditions of water-gated carrier density accumulation on graphene were investigated. In particular, either negative or positive electric potential in deionized water could be observed, leading to an increase or decrease in the hole charge carrier density, respectively. Furthermore, it was determined that the critical positive electric potential for water gating of graphene is required to return the accumulated carrier density back to its initial state. Taken together, these results provide valuable insight into the relationship between carrier accumulation and the deionized water gating method.

Keywords: Graphene, Carrier density, Water gating

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