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Pattern Selection of Surface-based Nanostructures

Published online by Cambridge University Press:  17 March 2011

E. G. Wang ,
B. G. Liu ,
J. Wu ,
W. G. Zhu  and
Z. Zhang
E. G. Wang
Affiliation:
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, P. R. China International Center for Quantum Structures, CAS, Beijing, P. R. China
B. G. Liu
Affiliation:
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, P. R. China
J. Wu
Affiliation:
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, P. R. China
W. G. Zhu
Affiliation:
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, P. R. China
Z. Zhang
Affiliation:
International Center for Quantum Structures, CAS, Beijing, P. R. China Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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Abstract

A rich variety of two-dimensional patterns can be formed in the early stages of film growth. In this paper, we will show that, when a surfactant layer is used to mediate the growth, a counter-intuitive fractal-to-compact island shape transition can be induced by increasing deposition flux or decreasing growth temperature. Specifically, we introduce a reaction limited aggregation (RLA) theory, where the physical process controlling the island shape transition is the shielding effect of adatoms stuck to stable islands on incoming adatoms. Also discussed is the origin of a transition of compact islands from triangular to hexagonal then to inverted triangular in Pt (111) homoepitaxy with the presence of CO adsorbates. We will provide a coherent and unified picture for the interpretation of these intriguing observations based on kinetic Monte Carlo simulations, with energy barriers from first-principles calculations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 648: Symposium P – Growth, Evolution & Properties of Surfaces, Thin Films, and Self Organized Structure , 2000 , P2.1
Copyright
Copyright © Materials Research Society 2001

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