Electronic structures of C60 adsorbed on Si(111)-(7 × 7) and Si(001)-(2 × 1) surfaces

K. Sakamoto; D. Kondo; M. Harada; A. Kimura; A. Kakizaki; S. Suto

doi:10.1016/S0039-6028(99)00094-1

Electronic structures of C₆₀ adsorbed on Si(111)-(7 × 7) and Si(001)-(2 × 1) surfaces

K. Sakamoto, D. Kondo, M. Harada, A. Kimura, A. Kakizaki, S. Suto

Institute for Excellence in Higher Education (IEHE) (organization affiliation only)

Research output: Contribution to journal › Conference article › peer-review

15 Citations (Scopus)

Abstract

We have investigated the electronic structures of C₆₀ molecules adsorbed on the Si(111)-(7 × 7) and Si(001)-(2 × 1) surfaces using photoelectron spectroscopy. The coverage-dependent valence band spectra show that the highest occupied molecular orbital (HOMO) of a C₆₀ molecule splits into two peaks on both surfaces at a coverage of less than 0.25 monolayer. These split peaks are assigned to be the shifted HOMO and the bonding state with the polarization-dependent measurements. The binding energies of the molecular orbitals and the C 1s core level show a small shift on the Si(001)-(2 × 1) surface and no shift on the Si(111)-(7 × 7) surface with decreasing the coverage. These results indicate that the strong interaction between C₆₀ molecules and the surfaces have a covalent character on the Si(111)-(7 × 7) surface, and both covalent and ionic characters on the Si(001)-(2 × 1) surface. We attribute the difference in the charge states of C₆₀ molecules to the different surface structures.

Original language	English
Pages (from-to)	642-646
Number of pages	5
Journal	Surface Science
Volume	433
DOIs	https://doi.org/10.1016/S0039-6028(99)00094-1
Publication status	Published - 1999 Aug 2
Event	Proceedings of the 1998 14th International Vacuum Congress(ICV-14), 10th Conference on Solid Surfaces(ICSS-10), 5th Conference on Nanometre-scale Science and Technology(NANO-5), 10th International Conference on Quantitative Surface Analysis(QSA-10) - Birmingham, UK Duration: 1998 Aug 31 → 1998 Sept 4

ASJC Scopus subject areas

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

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10.1016/S0039-6028(99)00094-1

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title = "Electronic structures of C60 adsorbed on Si(111)-(7 × 7) and Si(001)-(2 × 1) surfaces",

abstract = "We have investigated the electronic structures of C60 molecules adsorbed on the Si(111)-(7 × 7) and Si(001)-(2 × 1) surfaces using photoelectron spectroscopy. The coverage-dependent valence band spectra show that the highest occupied molecular orbital (HOMO) of a C60 molecule splits into two peaks on both surfaces at a coverage of less than 0.25 monolayer. These split peaks are assigned to be the shifted HOMO and the bonding state with the polarization-dependent measurements. The binding energies of the molecular orbitals and the C 1s core level show a small shift on the Si(001)-(2 × 1) surface and no shift on the Si(111)-(7 × 7) surface with decreasing the coverage. These results indicate that the strong interaction between C60 molecules and the surfaces have a covalent character on the Si(111)-(7 × 7) surface, and both covalent and ionic characters on the Si(001)-(2 × 1) surface. We attribute the difference in the charge states of C60 molecules to the different surface structures.",

author = "K. Sakamoto and D. Kondo and M. Harada and A. Kimura and A. Kakizaki and S. Suto",

note = "Funding Information: The authors are grateful to Professor A. Kasuya and Professor W. Uchida of Tohoku University for their critical discussions. This work was supported in part by Grant-in-Aid No. 08454072 from the Ministry of Education, Science and Culture, and the Kurata Research Grant.; Proceedings of the 1998 14th International Vacuum Congress(ICV-14), 10th Conference on Solid Surfaces(ICSS-10), 5th Conference on Nanometre-scale Science and Technology(NANO-5), 10th International Conference on Quantitative Surface Analysis(QSA-10) ; Conference date: 31-08-1998 Through 04-09-1998",

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doi = "10.1016/S0039-6028(99)00094-1",

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T1 - Electronic structures of C60 adsorbed on Si(111)-(7 × 7) and Si(001)-(2 × 1) surfaces

AU - Sakamoto, K.

AU - Kondo, D.

AU - Harada, M.

AU - Kimura, A.

AU - Kakizaki, A.

AU - Suto, S.

N1 - Funding Information: The authors are grateful to Professor A. Kasuya and Professor W. Uchida of Tohoku University for their critical discussions. This work was supported in part by Grant-in-Aid No. 08454072 from the Ministry of Education, Science and Culture, and the Kurata Research Grant.

PY - 1999/8/2

Y1 - 1999/8/2

N2 - We have investigated the electronic structures of C60 molecules adsorbed on the Si(111)-(7 × 7) and Si(001)-(2 × 1) surfaces using photoelectron spectroscopy. The coverage-dependent valence band spectra show that the highest occupied molecular orbital (HOMO) of a C60 molecule splits into two peaks on both surfaces at a coverage of less than 0.25 monolayer. These split peaks are assigned to be the shifted HOMO and the bonding state with the polarization-dependent measurements. The binding energies of the molecular orbitals and the C 1s core level show a small shift on the Si(001)-(2 × 1) surface and no shift on the Si(111)-(7 × 7) surface with decreasing the coverage. These results indicate that the strong interaction between C60 molecules and the surfaces have a covalent character on the Si(111)-(7 × 7) surface, and both covalent and ionic characters on the Si(001)-(2 × 1) surface. We attribute the difference in the charge states of C60 molecules to the different surface structures.

AB - We have investigated the electronic structures of C60 molecules adsorbed on the Si(111)-(7 × 7) and Si(001)-(2 × 1) surfaces using photoelectron spectroscopy. The coverage-dependent valence band spectra show that the highest occupied molecular orbital (HOMO) of a C60 molecule splits into two peaks on both surfaces at a coverage of less than 0.25 monolayer. These split peaks are assigned to be the shifted HOMO and the bonding state with the polarization-dependent measurements. The binding energies of the molecular orbitals and the C 1s core level show a small shift on the Si(001)-(2 × 1) surface and no shift on the Si(111)-(7 × 7) surface with decreasing the coverage. These results indicate that the strong interaction between C60 molecules and the surfaces have a covalent character on the Si(111)-(7 × 7) surface, and both covalent and ionic characters on the Si(001)-(2 × 1) surface. We attribute the difference in the charge states of C60 molecules to the different surface structures.

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DO - 10.1016/S0039-6028(99)00094-1

M3 - Conference article

AN - SCOPUS:0033356591

SN - 0039-6028

VL - 433

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EP - 646

JO - Surface Science

JF - Surface Science

T2 - Proceedings of the 1998 14th International Vacuum Congress(ICV-14), 10th Conference on Solid Surfaces(ICSS-10), 5th Conference on Nanometre-scale Science and Technology(NANO-5), 10th International Conference on Quantitative Surface Analysis(QSA-10)

Y2 - 31 August 1998 through 4 September 1998

ER -

Electronic structures of C₆₀ adsorbed on Si(111)-(7 × 7) and Si(001)-(2 × 1) surfaces

Abstract

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