Numerical Investigation on the Effects of InSb Geometry on the InGaSb Crystal Growth Under Microgravity

IF 1.3 4区工程技术 Q2 ENGINEERING, AEROSPACE

Microgravity Science and Technology Pub Date : 2023-09-15 DOI:10.1007/s12217-023-10072-x

Xin Jin, Sheng Xu, Bing Wang, Zhanjun Chen

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Abstract

In_xGa_1−xSb single crystals have been grown by using a GaSb/InSb/GaSb-sandwich system onboard at the International Space Station (ISS) via vertical gradient freezing method (VGF). In order to investigate the effects of InSb geometry on the InGaSb crystal growth under microgravity and further optimize the future space experiment, two-dimensional axisymmetric numerical simulations were carried out with different thicknesses and diameters of the InSb crystals. Simulation results showed that enough solutes from feed through diffusion is necessary for the crystal growth process and the InSb thickness will affect the axial Ga concentration gradient and therefore affect the crystal growth rates under microgravity. In addition, results also showed that a larger diameter for the InSb crystal will increase the volume crystal growth rates with a flatter shape for the grown crystal interfaces. In summary, simulation suggests a 2 mm or 3 mm thickness and a 12 mm diameter as the geometry of InSb for future space experiments.

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微重力下InSb几何形状对InGaSb晶体生长影响的数值研究

利用国际空间站(ISS)上的GaSb/InSb/GaSb夹层系统，通过垂直梯度冷冻法(VGF)生长出了InxGa1−xSb单晶。为了研究InSb几何形状对微重力下InGaSb晶体生长的影响，进一步优化未来的空间实验，采用不同厚度和直径的InSb晶体进行了二维轴对称数值模拟。模拟结果表明，晶体生长过程需要足够的溶质从进料到扩散，InSb厚度会影响轴向Ga浓度梯度，从而影响微重力下的晶体生长速率。此外，研究结果还表明，InSb晶体直径越大，晶体生长速度越快，生长的晶体界面形状越平坦。总之，模拟表明，未来空间实验中InSb的几何形状为2毫米或3毫米厚度和12毫米直径。

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来源期刊

Microgravity Science and Technology 工程技术-工程：宇航

CiteScore

3.50

自引率

44.40%

发文量

期刊介绍： Microgravity Science and Technology – An International Journal for Microgravity and Space Exploration Related Research is a is a peer-reviewed scientific journal concerned with all topics, experimental as well as theoretical, related to research carried out under conditions of altered gravity. Microgravity Science and Technology publishes papers dealing with studies performed on and prepared for platforms that provide real microgravity conditions (such as drop towers, parabolic flights, sounding rockets, reentry capsules and orbiting platforms), and on ground-based facilities aiming to simulate microgravity conditions on earth (such as levitrons, clinostats, random positioning machines, bed rest facilities, and micro-scale or neutral buoyancy facilities) or providing artificial gravity conditions (such as centrifuges). Data from preparatory tests, hardware and instrumentation developments, lessons learnt as well as theoretical gravity-related considerations are welcome. Included science disciplines with gravity-related topics are: − materials science − fluid mechanics − process engineering − physics − chemistry − heat and mass transfer − gravitational biology − radiation biology − exobiology and astrobiology − human physiology