title: HREELS, STM, and STS study of CH(3)-terminated Si(111)-(1x1) surface.
abstract: An ideally (1x1)-CH(3)(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 CH(3)-group as well as the C-Si bond. STM discerned an adlattice with (1x1) 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 CH(3) adlattice. This CH(3):Si(111)-(1x1) adlayer with high stability and unique electronic property is prospective for applications such as nanoscale lithography and advanced electrochemistry.
authors.affiliation: The Institute for Chemical and Physical Research (RIKEN), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
authors.forename: Taro
authors.initials: T
authors.lastname: Yamada
authors.forename: Maki
authors.initials: M
authors.lastname: Kawai
authors.forename: Andrzej
authors.initials: A
authors.lastname: Wawro
authors.forename: Shozo
authors.initials: S
authors.lastname: Suto
authors.forename: Atsuo
authors.initials: A
authors.lastname: Kasuya