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C-60 submonolayers on the Si(111)-(7 x 7) surface: Does a mixture of physisorbed and chemisorbed states exist?

  • S. Gangopadhyay
  • R. A. J. Woolley
  • R. Danza
  • M. A. Phillips
  • Karina Schulte
  • Li Wang
  • V. R. Dhanak
  • P. J. Moriarty
Publiceringsår: 2009
Språk: Engelska
Sidor: 2896-2901
Publikation/Tidskrift/Serie: Surface Science
Volym: 603
Nummer: 18
Dokumenttyp: Artikel i tidskrift
Förlag: Elsevier


We have carried out a combined X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy(UPS), and scanning tunnelling microscopy (STM) study of the C-60-Si(1 1 1) interaction where the XPS/UPS spectrometer and STM are integrated on a single UHV system. This enables a direct comparison of the XPS/UPS spectra with the STM data and eliminates any uncertainty in C-60 coverage measurements. X-ray standing wave measurements and density functional theory calculations have been used to support and interpret the results of the XPS/UPS/STM experiments. Our data conclusively rule out models of C-60 adsorption which involve a mixture of physisorbed and chemisorbed molecules [K. Sakamoto, et al., Phys. Rev. B 60 (1999) 2579]. Instead, we find that all molecules, up to 1 monolayer coverage, bond to the surface via Si-C bonds which are predominantly of covalent character. (C) 2009 Elsevier B.V. All rights reserved.


  • Natural Sciences
  • Physical Sciences
  • Scanning tunnelling microscopy
  • Interface
  • Silicon
  • C-60
  • Adsorption


  • ISSN: 0039-6028

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