Graphene/substrate charge transfer characterized by inverse photoelectron spectroscopy

ORAL

Abstract

Wave vector-resolved inverse photoelectron spectroscopy (IPES) measurements demonstrate that there is a large variation of interfacial charge transfer between graphene and various substrates. IPES measurements of CVD single layer graphene on BN(0001)/Ru(0001), Ru, Ni(poly), and Cu(poly) indicate a substrate-to-graphene charge transfer of approximately 0.07, 0.06, 0.03 e- per carbon atom respectively and a charge transfer of 0.02 e- from graphene to the MgO substrate per carbon atom. IPES and photoemission data also indicate that graphene/MgO(111) has a band gap. These data demonstrate that IPES is an effective method for precise measurement of substrate/graphene charge transfer due to the extreme surface sensitivity of IPES.

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Authors

  • Lingmei Kong

    • Department of Physics, University of Nebraska-Lincoln, Lincoln, NE USA

  • Cameron Bjelkevig

    • Department of Chemistry, University of North Texas, Denton, TX USA

  • Sneha Gaddam

    • Department of Chemistry, University of North Texas, Denton, TX USA

  • Mi Zhou

    • Department of Chemistry, University of North Texas, Denton, TX USA

  • YoungHee Lee

    • Department of Physics, Department of Energy Science, Sungkyunkwan University, Suwon, Korea

  • GangHee Han

    • Department of Physics, Department of Energy Science, Sungkyunkwan University, Suwon, Korea

  • HaeKyung Jeong

    • Department of Physics, Daegu University, Gyeongsan, Korea

  • Ning Wu

    • Department of Physics, University of Nebraska-Lincoln, Lincoln, NE USA

  • Zhengzheng Zhang

    • Department of Physics, University of Nebraska-Lincoln, Lincoln, NE USA

  • Jie Xiao

    • Department of Physics, University of Nebraska-Lincoln, Lincoln, NE USA

  • Peter Dowben

    • Department of Physics, University of Nebraska-Lincoln, Lincoln, NE USA

  • Jeffry Kelber

    • Department of Chemistry, University of North Texas, Denton, TX USA