Author : Nitin Singh
Publisher :
ISBN 13 : 9780549393412
Total Pages : 288 pages
Book Rating : 4.3/5 (934 download)
Book Synopsis Phase-field Model for Compositional and Morphological Evolution Studies in Thin Film Heteroepitaxial Systems by : Nitin Singh
Download or read book Phase-field Model for Compositional and Morphological Evolution Studies in Thin Film Heteroepitaxial Systems written by Nitin Singh and published by . This book was released on 2008 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: The initial focus of the dissertation is on the development of a diffuse-interface model for simulating microstructural evolution in a InxGa 1-xAsySb1-y alloy thin film-substrate system. The regions of instability are mapped on the phase diagram using the regular solution model. The influence of compositional strain and epitaxial strains on microstructure evolution is investigated. The model is further extended to simulate surface morphological evolution and coupled morphology-composition effects. The strain energy in the system is calculated by solving the Cauchy-Navier equations for equilibrium using a linear multigrid method. Generalized nonlinear Cahn-Hilliard equations are used to describe the evolution of the phase-field variables, which are solved using a nonlinear multigrid method. The model is used to investigate the influence of the sign of compositional strain and of the epitaxial mismatch on the arrangement of the equilibrium phases within the film. These studies indicate the possibility of compositional self-assembly processes in addition to morphological self-assembly.