Electronic structure of K-doped C60 monolayer films adsorbed on Si(0 0 1)-(2 × 1) and Si(1 1 1)-(7 × 7) surfaces

Kazuyuki Sakamoto, Takanori Wakita, Daiyu Kondo, Ayumi Harasawa, Toyohiko Kinoshita, Wakio Uchida, Atsuo Kasuya

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have measured the valence spectra of K-doped C60 monolayer films adsorbed on Si(0 0 1)-(2 × 1) and Si(1 1 1)-(7 × 7) surfaces. No density of states is observed at the Fermi level for the undoped C60 monolayer films on both Si surfaces. After a small K doping, a density of states is clearly observed at the Fermi level on a Si(0 0 1)-(2 × 1) surface. On the other hand, no density of states is observed at the Fermi level at any amount of K doping on a Si(1 1 1)-(7 × 7) surface. The difference observed on both Si surfaces indicates that the symmetry of C60 molecules is almost the same as that in solid phase on a Si(0 0 1)-(2 × 1) surface, and is broken due to a stronger C60-substrate and/or C60-C60 interaction on the Si(1 1 1)-(7 × 7) one.

Original languageEnglish
Pages (from-to)63-72
Number of pages10
JournalSurface Science
Volume499
Issue number1
DOIs
Publication statusPublished - Feb 20 2002
Externally publishedYes

Keywords

  • Fullerenes
  • Photoelectron spectroscopy
  • Surface electronic phenomena (work function, surface potential, surface states, etc.)

ASJC Scopus subject areas

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

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