Localized state and charge transfer in nitrogen-doped graphene

F. Joucken, Y. Tison, J. Lagoute, J. Dumont, D. Cabosart, B. Zheng, V. Repain, C. Chacon, Y. Girard, A.R. Botello-Méndez, S. Rousset, R. Sporken, J.-C. Charlier, L. Henrard

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    Abstract

    Nitrogen-doped epitaxial graphene grown on SiC(0001̄) was prepared by exposing the surface to an atomic nitrogen flux. Using scanning tunneling microscopy and scanning tunneling spectroscopy (STS), supported by density functional theory (DFT) calculations, the simple substitution of carbon with nitrogen atoms has been identified as the most common doping configuration. High-resolution images reveal a reduction of local charge density on top of the nitrogen atoms, indicating a charge transfer to the neighboring carbon atoms. Local STS spectra clearly evidenced the energy levels associated with the chemical doping by nitrogen, localized in the conduction band. Various other nitrogen-related defects have been observed. The bias dependence of their topographic signatures demonstrates the presence of structural configurations more complex than substitution as well as hole doping. © 2012 American Physical Society.
    Original languageEnglish
    JournalPhyscal Review B
    Volume85
    Issue number16
    DOIs
    Publication statusPublished - 18 Apr 2012

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