Effect of current annealing to the transport properties of CVD graphene cooled with a biased gate voltage

ORAL

Abstract

Chemical vapor deposition of graphene is an excellent method for obtaining large area single-layer graphene. A topic of interest in this area is to characterize and reduce the impurity level in this material. In this experimental work, we investigate impurity effects on electron /hole transport in a graphene specimen by cooling down a graphene Hall bar device under different gate bias voltages. Further, we examine the impact of current annealing on the transport characteristics. Here we present results from the measurements carried out in a closed cycle refrigerator out over a broad temperature range (295K–15K), focusing on the charge neutrality point.

*This work was supported by National Science Foundation (Grant No: ECCS 1710302), U.S. Department of Energy (Grant No. DE-SC0001762), Army Research Office (Grant No: W911NF-14-2-0076 and W911NF-15-1-0433)

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Presenters

  • U. Kushan Wijewardena

    • Physics and Astronomy, Georgia State University
    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
    • Department of Physics and Astronomy, Georgia State University
    • Physics & Astronomy, Georgia State University
    • Georgia State University

Authors

  • U. Kushan Wijewardena

    • Physics and Astronomy, Georgia State University
    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
    • Department of Physics and Astronomy, Georgia State University
    • Physics & Astronomy, Georgia State University
    • Georgia State University

  • Tharanga Nanayakkara

    • Physics and Astronomy, Georgia State University
    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
    • Department of Physics and Astronomy, Georgia State University
    • Physics & Astronomy, Georgia State University
    • Georgia State University

  • Rasanga Samaraweera

    • Physics and Astronomy, Georgia State University
    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
    • Department of Physics and Astronomy, Georgia State University
    • Physics & Astronomy, Georgia State University
    • Georgia State University

  • Binuka Gunawardana

    • Physics and Astronomy, Georgia State University
    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
    • Department of Physics and Astronomy, Georgia State University
    • Physics & Astronomy, Georgia State University
    • Georgia State University

  • C. Rasadi Munasinghe

    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
    • Department of Physics and Astronomy, Georgia State University
    • Physics & Astronomy, Georgia State University
    • Georgia State University

  • Sajith Withanage

    • Physics and Astronomy, Georgia State University
    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
    • Department of Physics and Astronomy, Georgia State University
    • Physics & Astronomy, Georgia State University
    • Georgia State University

  • Annika Kriisa

    • Physics and Astronomy, Georgia State University
    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
    • Georgia State University
    • Department of Physics and Astronomy, Georgia State University
    • Physics & Astronomy, Georgia State University

  • Ramesh Mani

    • Physics and Astronomy, Georgia State University
    • Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
    • Georgia State University
    • Department of Physics and Astronomy, Georgia State University
    • Physics & Astronomy, Georgia State University