title: Adsorption and self-assembled structures of sexithiophene on the Si(111)-√3×√3-Ag surface.
abstract: The adsorption and self-assembled structures of α-sexithiophene (α-6T) have been investigated on a Si(111)-Ag surface using scanning tunneling microscopy (STM), low-energy electron diffraction, and density functional theory calculations. The adsorbed α-6T molecules are arranged into unidirectional molecular rows with a side-by-side orientation. The molecular rows reveal three kinds of appearances in the filled-state STM images, which reflect the distinct adsorption sites. From tunneling spectroscopy, we find that the filled-state STM images of α-6T should be influenced by the surface states of Si(111)-Ag. At one monolayer coverage, sequentially ordering of the triple molecular rows results in the close-packed arrangement of the α-6T overlayer.
authors.affiliation: Department of Nanoscience and Technology, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Yokoyama
authors.affiliation: Department of Nanoscience and Technology, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan.
authors.forename: Mitsunori
authors.initials: M
authors.lastname: Kawasaki
authors.affiliation: Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
authors.forename: Tomotaka
authors.initials: T
authors.lastname: Asari
authors.affiliation: Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
authors.forename: Shinya
authors.initials: S
authors.lastname: Ohno
authors.affiliation: Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Tanaka
authors.affiliation: Department of Applied Mathematics and Physics, Tottori University, 4-101 Koyama-Minami, Tottori 680-8552, Japan.
authors.forename: Yoshihide
authors.initials: Y
authors.lastname: Yoshimoto