Liquid phase heteroepitaxial growth on convex substrate using binary phase field crystal model

摘要

The liquid phase heteroepitaxial growth on convex substrate is investigated with the binary phase field crystal (PFC) model. The paper aims to focus on the transformation of the morphology of epitaxial films on convex substrate with two different radiuses of curvature (Omega) as well as influences of substrate vicinal angles on films growth. It is found that films growth experience different stages on convex substrate with different radiuses of curvature (Omega). For Omega = 512 Delta x, the process of epitaxial film growth includes four stages: island coupled with layer-by-layer growth, layer-by-layer growth, island coupled with layer-by layer growth, layer-by-layer growth. For Omega =1024 Delta x, film growth only experience islands growth and layer-by-layer growth. Also, substrate vicinal angle (pi) is an important parameter for epitaxial film growth. We find the film can grow well when pi = 2 degrees for = 512 Delta x, while the optimized film can be obtained when pi = 4 degrees for Omega = 512 Delta x. (C) 2018 Elsevier Ltd. All rights reserved.