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Structural transformations in Pb/Si(111) phases induced by C₆₀ adsorption.

A V Matetskiy¹, L V Bondarenko, D V Gruznev

¹Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia. School of Natural Sciences, Far Eastern Federal University, 690950 Vladivostok, Russia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|September 10, 2013

Summary

This summary is machine-generated.

Adsorbing C₆₀ fullerenes onto lead (Pb) films on silicon (Si) surfaces causes structural transformations. C₆₀ islands expel Pb atoms, driving rapid, correlated atomic motion, not random diffusion.

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Area of Science:

Surface Science
Materials Science
Nanotechnology

Background:

The Pb/Si(111) surface is a well-studied system for thin film growth.
Fullerenes (C₆₀) are important molecules in nanotechnology and materials science.
Understanding surface interactions is crucial for developing new electronic and catalytic materials.

Purpose of the Study:

To investigate the structural transformations on the Pb/Si(111) surface after C₆₀ adsorption.
To elucidate the mechanism of lead atom displacement induced by C₆₀.
To determine the role of surface defects and C₆₀ island morphology in these transformations.

Main Methods:

Scanning Tunneling Microscopy (STM) for atomic-scale imaging.
Low-Energy Electron Diffraction (LEED) for surface structure analysis.
Controlled adsorption of C₆₀ onto Pb/Si(111) at various temperatures.

Main Results:

C₆₀ adsorption induces structural transformations on the Pb/Si(111) surface.
C₆₀ molecules form islands, typically nucleating at surface defects, expelling Pb atoms.
Pb atom expulsion leads to the formation of denser Pb/Si(111) phases.
The process involves rapid, correlated motion of Pb atoms, inconsistent with simple diffusion.

Conclusions:

Surface defects play a critical role in C₆₀-induced Pb atom expulsion.
Self-assembly of ordered C₆₀ islands on defect-free surfaces suppresses Pb atom displacement.
The observed rapid structural changes suggest a collective, non-diffusive mechanism for Pb atom rearrangement.