Toward Multiscale Modeling Of Thin-Film Growth Processes Using Slkmc

Keywords

diffusion; epitaxy; kinetics

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.

Publication Date

3-28-2018

Publication Title

Journal of Materials Research

Volume

33

Issue

6

Number of Pages

709-719

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1557/jmr.2018.44

Socpus ID

85044591678 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85044591678

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