Energy level alignment of C 60 /Co using x-ray and UV photoelectron spectroscopy

J. H. Seo, S. J. Kang, C. Y. Kim, Kyung-hwa Yoo, C. N. Whang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The energy level alignment at the interface between fullerene (C 60 ) and Co has been determined by x-ray and ultraviolet photoelectron spectroscopy. To investigate the interfacial electronic structure, a C 60 layer was deposited on a clean Co surface in a stepwise manner. The measured onset of the highest occupied molecular orbital energy level was at 1.54eV from the Fermi level of Co. The vacuum level was shifted 0.41eV toward lower binding energy with the additional C 60 layers, which means that an interface dipole exists at the interface between C 60 and Co. The C 1s spectra show that band bending occurs at the interface between C 60 and Co. These results indicate that the barrier height of the hole injection from Co to C 60 is 1.14eV, which is a smaller value than that for electron injection (1.46eV).

Original languageEnglish
Article numberS21
JournalJournal of Physics Condensed Matter
Volume18
Issue number33
DOIs
Publication statusPublished - 2006 Aug 23

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Photoelectron spectroscopy
Ultraviolet spectroscopy
Electron energy levels
energy levels
alignment
photoelectron spectroscopy
Ultraviolet photoelectron spectroscopy
Fullerenes
X rays
Electron injection
Molecular orbitals
Fermi level
Binding energy
Electronic structure
x rays
Vacuum
injection
ultraviolet spectroscopy
fullerenes
molecular orbitals

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Energy level alignment of C 60 /Co using x-ray and UV photoelectron spectroscopy",
abstract = "The energy level alignment at the interface between fullerene (C 60 ) and Co has been determined by x-ray and ultraviolet photoelectron spectroscopy. To investigate the interfacial electronic structure, a C 60 layer was deposited on a clean Co surface in a stepwise manner. The measured onset of the highest occupied molecular orbital energy level was at 1.54eV from the Fermi level of Co. The vacuum level was shifted 0.41eV toward lower binding energy with the additional C 60 layers, which means that an interface dipole exists at the interface between C 60 and Co. The C 1s spectra show that band bending occurs at the interface between C 60 and Co. These results indicate that the barrier height of the hole injection from Co to C 60 is 1.14eV, which is a smaller value than that for electron injection (1.46eV).",
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Energy level alignment of C 60 /Co using x-ray and UV photoelectron spectroscopy . / Seo, J. H.; Kang, S. J.; Kim, C. Y.; Yoo, Kyung-hwa; Whang, C. N.

In: Journal of Physics Condensed Matter, Vol. 18, No. 33, S21, 23.08.2006.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Energy level alignment of C 60 /Co using x-ray and UV photoelectron spectroscopy

AU - Seo, J. H.

AU - Kang, S. J.

AU - Kim, C. Y.

AU - Yoo, Kyung-hwa

AU - Whang, C. N.

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AB - The energy level alignment at the interface between fullerene (C 60 ) and Co has been determined by x-ray and ultraviolet photoelectron spectroscopy. To investigate the interfacial electronic structure, a C 60 layer was deposited on a clean Co surface in a stepwise manner. The measured onset of the highest occupied molecular orbital energy level was at 1.54eV from the Fermi level of Co. The vacuum level was shifted 0.41eV toward lower binding energy with the additional C 60 layers, which means that an interface dipole exists at the interface between C 60 and Co. The C 1s spectra show that band bending occurs at the interface between C 60 and Co. These results indicate that the barrier height of the hole injection from Co to C 60 is 1.14eV, which is a smaller value than that for electron injection (1.46eV).

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