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

doi:10.1016/S0039-6028(01)01794-0

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 journal › Article › peer-review

5 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 language	English
Pages (from-to)	63-72
Number of pages	10
Journal	Surface Science
Volume	499
Issue number	1
DOIs	https://doi.org/10.1016/S0039-6028(01)01794-0
Publication status	Published - Feb 20 2002
Externally published	Yes

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

Access to Document

10.1016/S0039-6028(01)01794-0

Cite this

@article{bc624835f9b54a408c2ea9e25bc85f69,

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

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.",

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

author = "Kazuyuki Sakamoto and Takanori Wakita and Daiyu Kondo and Ayumi Harasawa and Toyohiko Kinoshita and Wakio Uchida and Atsuo Kasuya",

note = "Funding Information: The authors are grateful to Prof. S. Suto of Tohoku University, Prof. A. Kimura of Hiroshima University and Dr. T. Okuda of the University of Tokyo for their critical discussions. This work was performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 99G011). This work was supported in part by the Grant-in-Aid for Scientific Research on the Priority Area “Fullerenes and Nanotubes” by the Ministry of Education, Science, Sports and Culture of Japan, and by the Izumi Science and Technology Foundation.",

year = "2002",

month = feb,

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doi = "10.1016/S0039-6028(01)01794-0",

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TY - JOUR

T1 - Electronic structure of K-doped C60 monolayer films adsorbed on Si(0 0 1)-(2 × 1) and Si(1 1 1)-(7 × 7) surfaces

AU - Sakamoto, Kazuyuki

AU - Wakita, Takanori

AU - Kondo, Daiyu

AU - Harasawa, Ayumi

AU - Kinoshita, Toyohiko

AU - Uchida, Wakio

AU - Kasuya, Atsuo

N1 - Funding Information: The authors are grateful to Prof. S. Suto of Tohoku University, Prof. A. Kimura of Hiroshima University and Dr. T. Okuda of the University of Tokyo for their critical discussions. This work was performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 99G011). This work was supported in part by the Grant-in-Aid for Scientific Research on the Priority Area “Fullerenes and Nanotubes” by the Ministry of Education, Science, Sports and Culture of Japan, and by the Izumi Science and Technology Foundation.

PY - 2002/2/20

Y1 - 2002/2/20

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.

KW - Fullerenes

KW - Photoelectron spectroscopy

KW - Surface electronic phenomena (work function, surface potential, surface states, etc.)

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