Abstract
Fullerene (C 60) molecules on an Si(111)-(7 × 7) surface have been investigated using non-contact scanning non-linear dielectric microscopy (NC-SNDM) under an ultra-high vacuum. The topography, the interface between the C 60 molecule and Si adatoms, and the internal structure of the C 60 molecules were successfully investigated. For ∼ 0 ML and ∼ 0.4 ML coverage, both phase reversal sites and sites without phase reversal could be observed in the first order phase (θ1) image. On the other hand, for 1 ML coverage, phase reversal could not be identified. These results indicate that charge transfer only occurred from Si adatoms to C 60 molecules at three-fold symmetric sites on the Si(111)-(7 × 7) surface, and the electric dipole moment is reflected in the electronic state of the C 60 molecules. The internal structure of C 60 molecules was clearly observed in topography by the second order amplitude (A 2) feedback signal for 1 ML coverage, reflecting the LDOS originating from the t 1u orbital.
Original language | English |
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Pages (from-to) | 174-180 |
Number of pages | 7 |
Journal | Surface Science |
Volume | 606 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - 2012 Feb |
Keywords
- Fullerene
- Non-contact scanning non-linear dielectric microscopy
- Si(111)-(7 × 7) surface
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry