Molecular orientations and adsorption structures of α-sexithienyl thin films grown on Ag (1 1 0) and Ag (1 1 1) surfaces

Genki Yoshikawa, Manabu Kiguchi, Susumu Ikeda, Koichiro Saiki

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Molecular orientations and adsorption structures of α-sexithienyl (6T) thin films grown on Ag(110) and Ag(111) surfaces were studied by near edge X-ray absorption fine structure (NEXAFS) and reflection high energy electron diffraction (RHEED). The out-of-plane (perpendicular to the surface) and in-plane (parallel to the surface) orientations of the 6T molecules were determined by analyzing the polarization dependence of S 1s to π* or σ* resonance intensity. 6T molecules grew on Ag(110) and Ag(111) with their molecular planes parallel to the substrate surface irrespective of film thickness. On Ag(110), a novel pseudo-one-dimensional structure of 6T molecules oriented toward [001] direction could be observed. The models for adsorption structures of 6T on Ag(110) and Ag(111) are proposed by taking account of the lattice commensurability.

Original languageEnglish
Pages (from-to)77-84
Number of pages8
JournalSurface Science
Volume559
Issue number2-3
DOIs
Publication statusPublished - 2004 Jun 20
Externally publishedYes

Keywords

  • Aromatics
  • Interface states
  • Molecular beam epitaxy
  • Near edge extended X-ray absorption fine structure (NEXAFS)
  • Reflection high-energy electron diffraction (RHEED)
  • Silver
  • Surface structure, morphology, roughness, and topology

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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