HREELS, STM, and STS study of CH3-terminated Si(111)-(1×1) surface

Taro Yamada, Maki Kawai, Andrzej Wawro, Shozo Suto, Atsuo Kasuya

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46 Citations (Scopus)


An ideally (1×1)-CH3(methyl)-terminated Si(111) surface was composed by Grignard reaction of photochlorinated Si(111) and the surface structure was for the first time confirmed by Auger electron spectroscopy, low energy electron diffraction, high-resolution electron energy loss spectroscopy (HREELS), scanning tunneling microscopy (STM), and scanning tunneling spectroscopy (STS). HREELS revealed the vibration modes associated to the CH3-group as well as the C-Si bond. STM discerned an adlattice with (1×1) periodicity on Si(111) composed of protrusions with internal features, covering all surface terraces. The surface structure was confirmed to be stable at temperatures below 600 K. STS showed that an occupied-state band exists at gap voltage of - 1.57 eV, generated by the surface CH3 adlattice. This CH3:Si(111)-(1×1) adlayer with high stability and unique electronic property is prospective for applications such as nanoscale lithography and advanced electrochemistry.

Original languageEnglish
Pages (from-to)10660-10667
Number of pages8
JournalJournal of Chemical Physics
Issue number21
Publication statusPublished - 2004 Dec 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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