Degree Type

Dissertation

Date of Award

2001

Degree Name

Doctor of Philosophy

Department

Chemistry

First Advisor

James W. Evans

Second Advisor

Mark S. Gordon

Abstract

Theoretical studies of the nucleation and growth of metal films are performed, where the focus is the Molecular Beam Epitaxial (MBE) growth of Ag on the Ag(100) surface. Ag films grown under MBE, for the temperatures and atomic fluxes considered here (0→300K), are very far from equilibrium structures, due to the breaking of detailed balance during deposition. Included are studies of: metal film growth at very low temperatures; the temperature dependence of "mound" formation; the temperature dependence of kinetic roughening; the effect of the step-edge barrier on very thin films, and the post-deposition time dependence of nucleation. For these studies a range of lattice gas models are developed that are thought to contain the essential physics. These models contain such features as terrace diffusion, realistic edge diffusion process, a non-uniform Erlich-Schwoebel barrier, "restricted" and normal Downward Funneling, and low barrier diffusion process along micro-facets. The models were then tested by first performing a Kinetic Monte-Carlo simulation, and comparing the results to experimental data generated from previous Scanning Tunneling Microscopy studies. The models not only proved to be in good agreement with average quantities of the experimental film, but also proved to reproduce the details of the experimental morphologies quite well.

DOI

https://doi.org/10.31274/rtd-180813-8806

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu

Copyright Owner

Kyle John Caspersen

Language

en

Proquest ID

AAI3034174

File Format

application/pdf

File Size

250 pages

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