• 文献标题:   Localized state and charge transfer in nitrogen-doped graphene
  • 文献类型:   Article
  • 作  者:   JOUCKEN F, TISON Y, LAGOUTE J, DUMONT J, CABOSART D, ZHENG B, REPAIN V, CHACON C, GIRARD Y, BOTELLOMENDEZ AR, ROUSSET S, SPORKEN R, CHARLIER JC, HENRARD L
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:   Univ Namur FUNDP
  • 被引频次:   84
  • DOI:   10.1103/PhysRevB.85.161408
  • 出版年:   2012

▎ 摘  要

Nitrogen-doped epitaxial graphene grown on SiC(000 (1) over bar) 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.