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The Influence of an Adsorbate Layer on Adatom Diffusion and Island Nucleation: Fe on Si(111)-Ö3 ×Ö3 -AuSi(111)-√3×√3-Au

Paredis, K. and Smeets, D. and Vantomme, A. (2009) The Influence of an Adsorbate Layer on Adatom Diffusion and Island Nucleation: Fe on Si(111)-Ö3 ×Ö3 -AuSi(111)-√3×√3-Au. Nanoscale Research Letters, 4 (12). pp. 1447-1451. ISSN 1931-7573 (Print) 1556-276X (Online)

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Official URL: http://www.springerlink.com/content/j051n268057187...

Abstract

Using scanning tunneling microscopy, the influence of a thin Au layer on the diffusion of Fe adatoms and the subsequent island nucleation on a Si(111) surface is investigated. The adsorbate induces the $$\hbox{Si(111)-}\sqrt{3}\times \sqrt{3} \hbox{-Au} $$ structure that increases the surface mobility of subsequently deposited Fe atoms, resulting in the formation well-defined nanoclusters. Surprisingly, the domain walls—inherent to the $$\sqrt{3} \times \sqrt{3} \hbox{-Au} $$ reconstruction—do not influence the surface diffusion, which demonstrates that the passivation is of much more importance for the self-assembly than the surface corrugation. Using the decoupling of the diffusion and nucleation on the surface and the reaction with the surface and conventional nucleation theory, the activation energy for surface diffusion E d = 0.61 eV and the critical cluster size i = 3 are determined, which reveal the microscopic details of the diffusion and nucleation processes.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:8334
Deposited By:JNCASR
Deposited On:05 Jun 2010 09:10
Last Modified:05 Jun 2010 09:10

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