C-60 submonolayers on the Si(111)-(7 x 7) surface: Does a mixture of physisorbed and chemisorbed states exist?
Author
Summary, in English
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.
Department/s
Publishing year
2009
Language
English
Pages
2896-2901
Publication/Series
Surface Science
Volume
603
Issue
18
Document type
Journal article
Publisher
Elsevier
Topic
- Natural Sciences
- Physical Sciences
Keywords
- Scanning tunnelling microscopy
- Interface
- Silicon
- C-60
- Adsorption
Status
Published
ISBN/ISSN/Other
- ISSN: 0039-6028