Kinetic Monte Carlo simulation of strained heteroepitaxy in three dimensions

Pao Yue-kong Library Electronic Theses Database

Kinetic Monte Carlo simulation of strained heteroepitaxy in three dimensions

 

Author: Lung, Man-tat
Title: Kinetic Monte Carlo simulation of strained heteroepitaxy in three dimensions
Degree: M.Phil.
Year: 2005
Subject: Hong Kong Polytechnic University -- Dissertations
Epitaxy -- Mathematical models
Department: Dept. of Applied Physics
Pages: ix, 52 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1818116
URI: http://theses.lib.polyu.edu.hk/handle/200/1612
Abstract: Morphological evolution of strained heteroepitaxial films is studied using a kinetic Monte Carlo method in three dimensions. The film-substrate structure is modeled by a cubic lattice of balls and springs representing atoms and elastic interactions. Atomic surface diffusion is simulated using an activated hopping algorithm. The hopping barrier depends on both atomic coordination and elastic stress so that poorly coordinated or highly stressed atoms hop preferentially. The elastic stress is efficiently computed repeatedly during every stage in the surface evolution using a Green's function method and a super-particle coarsening approximation. Applying our algorithms, films of area up to 64 by 64 atoms are studied. We have simulated annealing of initially flat films. At relatively high temperature, the film surface develops ripples, which later grow into three dimensional (3D) islands. At lower temperature, two dimensional (2D) islands and 3D pits are observed. The pits subsequently develop into grooves. Simulations of film deposition are also conducted. At low deposition rate, isolated 3D islands are observed. At higher deposition rate comparable to the corresponding surface roughening rate, morphologies similar to those from annealing are observed.

Files in this item

Files Size Format
b18181168.pdf 2.949Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information