Anisotropy in nucleation and growth of two-dimensional islands during homoepitaxy on hex'' reconstructed Au(100)

Journal Article · Mon Jul 25 00:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.73.553· OSTI ID:7249421

Guenther, S; Kopatzki, E; Bartelt, M C; Evans, J W; Behm, R J ^[1]

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1. Abteilung Oberflaechenchemie und Katalyse, Universitaet Ulm, D-89069 Ulm (Germany) Institute for Physical Research and Technology, Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States) Department of Mathematics, Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States)

We present results of a comprehensive scanning tunneling microscopy study of the nucleation and growth of Au islands on Au(100). It is shown that the reconstruction of the substrate produces strong anisotropic effects. Rate equation analysis of the experimental flux and temperature dependence of the island density suggests: (i) a critical size of [ital i]=3 for [ital T]=315--380 K, but [ital i][gt]3 above 400 K; and (ii) strongly anisotropic diffusion, preferentially parallel to the reconstruction rows (activation energy [similar to]0.2 eV). We comment on energetic and kinetic aspects of the observed island shape anisotropy.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 7249421
• Journal Information: Physical Review Letters; (United States), Vol. 73:4; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GOLD
EPITAXY
ANISOTROPY
CRYSTAL GROWTH
DIFFUSION
ELECTRON MICROSCOPY
KINETICS
MORPHOLOGY
NUCLEATION
ELEMENTS
METALS
MICROSCOPY
TRANSITION ELEMENTS
360101* - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies