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Toward multiscale modeling of thin-film growth processes using SLKMC

Published online by Cambridge University Press:  28 March 2018

Shree Ram Acharya  and
Talat S. Rahman
Shree Ram Acharya
Affiliation:
Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
Talat S. Rahman*
Affiliation:
Department of Physics, University of Central Florida, Orlando, Florida 32816, USA; and Donostia International Physics Center, Donostia-San Sebastian 20018, Spain
*
a)Address all correspondence to this author. e-mail: Talat.Rahman@ucf.edu
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Abstract

The self-learning kinetic Monte Carlo method has been shown to be suitable for examining the temporal and spatial evolution of adatom islands on the (111) surface of several fcc metals, unbiased by diffusion processes chosen a priori. A pattern-recognition scheme and a diffusion path finder scheme enable collection of a large database of diffusion processes and their energetics. A variety of mechanisms involving single and multiple atoms, and concerted island motion are uncovered in long-time simulations. In this contribution, after reviewing the methodology, we present results comparing the diffusion kinetics of two sets of homo-epitaxial and hetero-epitaxial systems: small (2–8 atom) Pd and Ag islands on the respective (111) surfaces and small Cu islands on Ni(111) and Ni islands on Cu(111). We trace the dominance of concerted motion in Pd/Pd(111) and Ni/Cu(111) and competition among concerted, multiatom and single-atom processes in Ag/Ag(111) and Cu/Ni(111) to the strength of the lateral interaction among adatoms in these systems.

Keywords

diffusionepitaxykinetics
Type
Articles
Information
Journal of Materials Research , Volume 33 , Issue 6 , 28 March 2018 , pp. 709 - 719
Copyright
Copyright © Materials Research Society 2018 

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References

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