Leshchenko Egor D, Johansson Jonas
Solid State Physics and NanoLund, Lund University, PO Box 118, SE-221 00 Lund, Sweden.
Nanomaterials (Basel). 2020 Dec 18;10(12):2553. doi: 10.3390/nano10122553.
We explain the composition of ternary nanowires nucleating from a quaternary liquid melt. The model we derive describes the evolution of the solid composition from the nucleated-limited composition to the kinetic one. The effect of the growth temperature, group V concentration and Au/III concentration ratio on the solid-liquid dependence is studied. It has been shown that the solid composition increases with increasing temperature and Au concentration in the droplet at the fixed In/Ga concentration ratio. The model does not depend on the site of nucleation and the geometry of monolayer growth and is applicable for nucleation and growth on a facet with finite radius. The case of a steady-state (or final) solid composition is considered and discussed separately. While the nucleation-limited liquid-solid composition dependence contains the miscibility gap at relevant temperatures for growth of InGaAs NWs, the miscibility gap may be suppressed completely in the steady-state growth regime at high supersaturation. The theoretical results are compared with available experimental data via the combination of the here described solid-liquid and a simple kinetic liquid-vapor model.
我们解释了从四元液态熔体中形核的三元纳米线的组成。我们推导的模型描述了固体组成从形核限制组成到动力学组成的演变。研究了生长温度、V族元素浓度和金/III族元素浓度比 对固液依赖性的影响。结果表明，在固定的铟/镓浓度比下，固体组成随温度和液滴中金浓度的增加而增加。该模型不依赖于形核位置和单层生长的几何形状，适用于有限半径晶面上的形核和生长。稳态（或最终）固体组成的情况被单独考虑和讨论。虽然形核限制的液固组成依赖性在相关温度下包含了用于生长铟镓砷纳米线的混溶间隙，但在高过饱和度的稳态生长 regime 中，混溶间隙可能会被完全抑制。通过结合这里描述的固液模型和一个简单的动力学液-气模型，将理论结果与现有的实验数据进行了比较。
