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

Fingerprint

Electronic structure
Monolayers
electronic structure
Fermi level
Doping (additives)
solid phases
valence
Molecules
symmetry
Substrates
molecules
interactions

Keywords

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

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Electronic structure of K-doped C60 monolayer films adsorbed on Si(0 0 1)-(2 × 1) and Si(1 1 1)-(7 × 7) surfaces. / Sakamoto, Kazuyuki; Wakita, Takanori; Kondo, Daiyu; Harasawa, Ayumi; Kinoshita, Toyohiko; Uchida, Wakio; Kasuya, Atsuo.

In: Surface Science, Vol. 499, No. 1, 20.02.2002, p. 63-72.

Research output: Contribution to journalArticle

Sakamoto, Kazuyuki ; Wakita, Takanori ; Kondo, Daiyu ; Harasawa, Ayumi ; Kinoshita, Toyohiko ; Uchida, Wakio ; Kasuya, Atsuo. / Electronic structure of K-doped C60 monolayer films adsorbed on Si(0 0 1)-(2 × 1) and Si(1 1 1)-(7 × 7) surfaces. In: Surface Science. 2002 ; Vol. 499, No. 1. pp. 63-72.
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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.",
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AU - Sakamoto, Kazuyuki

AU - Wakita, Takanori

AU - Kondo, Daiyu

AU - Harasawa, Ayumi

AU - Kinoshita, Toyohiko

AU - Uchida, Wakio

AU - Kasuya, Atsuo

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N2 - 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.

AB - 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.

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