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Increasing the Rate of Magnesium Intercalation Underneath Epitaxial Graphene on Silicon Carbide

ORAL

Abstract

Magnesium intercalated ‘quasi-freestanding’ bilayer graphene on 6H-SiC(0001) (Mg-QFSBLG) has many favorable properties - highly n-type doped (≈1014), relatively stable in ambient conditions (6 hours) and large bandgap (≈0.36 eV). However, the intercalation of Mg underneath graphene is challenging, requiring multiple intercalation steps. 

In this talk, I will briefly overview our recently published works on Mg intercalated graphene, and subsequently, how one can overcome the intercalation challenges posed by Mg. To do this, we laser pattern (ablate) the graphene to form micron-sized discontinuities, and show that this results in a significant increase in the rate of Mg intercalation as observed using low energy electron diffraction and X-ray photoelectron spectroscopy. By modeling Mg intercalation with the Verhulst equation, we are able to empirically compare the intercalation rate between patterned and non-patterned samples. The model implies that the increased intercalation rate is proportional to the increase in edge length from the micron-sized discontinuities. Furthermore, the model and patterning technique we use may be applicable to other intercalated elements or molecules.

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Publication: https://doi.org/10.1021/acs.chemmater.0c01729<br>https://doi.org/10.1016/j.apsusc.2020.148612<br>Submitted: "Increasing the Rate of Magnesium Intercalation Underneath Epitaxial Graphene on 6H-SiC(0001)"

Presenters

  • Jimmy C Kotsakidis

    Monash University

Authors

  • Jimmy C Kotsakidis

    Monash University

  • Authur Suits

    Princeton University, Aalto University, U.S. Naval Research Laboratory, Louisiana State University, University of South Florida, DBIO, Boston College, QCD Labs, Aalto University, DMP, Univeristy of Chicago, University of California, Berkeley, University of Delaware, University of Missouri

  • Antonija Grubišić-Čabo

    Monash University

  • Anton Tadich

    Australian Synchrotron

  • Rachael L Myers-Ward2

    U.S. Naval Research Laboratory, United States Naval Research Laboratory, U.S. Naval Research Laboratory, Washington, DC, U.S. Naval Research Laboratory, Washington, DC 20375, USA

  • Matthew DeJarld

    U.S. Naval Research Laboratory

  • Kevin M Daniels

    University of Maryland, University of Maryland, College Park

  • Chang Liu

    Monash University

  • Mark T Edmonds

    Monash University

  • Amadeo L Vazquez de Parga

    Autonomous University of Madrid, Departamento de Fisica de la Materia Condensada, Universidad Autonoma de Madrid, 28049 Madrid, Spain

  • Michael S Fuhrer

    Monash University

  • Kurt D Gaskill

    U.S. Naval Research Laboratory, Institution for Research in Electronics and Applied Physics, University of Maryland, College Park MD, University of Maryland, Institution for Research in Electronics and Applied Physics, University of Maryland, College Park MD 20740