支撑异质外延纳米岛的平衡形状和尺寸
Equilibrium Shape and Size of Supported Heteroepitaxial Nanoislands
摘要：
我们研究了应变异质外延纳米岛的平衡形状，形状转变和最佳尺寸的二维原子模型，使用简单可调的原子间对势。我们绘制出的全球相图作为一个功能的基板吸附质失配和相互作用。该相图揭示了与不同的已知生长模式相对应的所有阶段。特别是，对于足够大的失配和有吸引力的基板有一个斯特兰斯基-Krastanow政权，其中纳米尺寸的岛屿上生长的润湿膜。我们详细分析了对岛的总能量有贡献的各个项，并展示了它们之间的竞争如何导致岛的最佳形状和大小。最后，我们还开发了一个解析插值公式的各种贡献的应变纳米岛的总能量。
英文摘要：
We study the equilibrium shape, shape transitions and optimal size of strained heteroepitaxial nanoislands with a two-dimensional atomistic model using simply adjustable interatomic pair potentials. We map out the global phase diagram as a function of substrate-adsorbate misfit and interaction. This phase diagram reveals all the phases corresponding to different well-known growth modes. In particular, for large enough misfits and attractive substrate there is a Stranski-Krastanow regime, where nano-sized islands grow on top of wetting films. We analyze the various terms contributing to the total island energy in detail, and show how the competition between them leads to the optimal shape and size of the islands. Finally, we also develop an analytic interpolation formula for the various contributions to the total energy of strained nanoislands.
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