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空间的微重力给晶体生长提供了一个消除自然对流、由纯扩散控制的生长环境 ,为提高晶体质量创造了条件 ,引起晶体生长研究人员的关注 .中国科学院物理研究所和日本东京大学电子工程系合作 ,1 992年在中国第 1 4颗返回式卫星上成功地生长了一根 6mm× 30mm外形完整的GaSb单晶 .对空间生长的晶体的研究显示 :晶体在空间生长部分无Ⅰ类生长条纹 ,表明晶体生长时既无自然对流也没有Marangoni对流 .位错密度测定表明 ,晶体在空间生长期间熔体未与坩埚器壁接触时生长的晶体位错密度接近于零 ,而熔体与坩埚器壁接触后位错密度迅速增高 .详细叙述了该晶体的生长和研究 ,分析了微重力对晶体生长的影响 ,并对空间晶体生长的发展提出看法 .
Microgravity in space provides a growth environment for crystal growth that eliminates natural convection and is controlled by pure diffusion, creating conditions for improving crystal quality and causing concern for researchers in crystal growth. Institute of Physics, The Chinese Academy of Sciences, and Department of Electronic Engineering, University of Tokyo, Japan , A GaSb single crystal with a size of 6 mm × 30 mm has been successfully grown on the 14th returning satellite in China in 1992. Studies on the crystal grown in space show that there is no type I growth in the crystal growth part Stripes indicate that there is neither natural convection nor Marangoni convection during crystal growth.Determination of dislocation density shows that the dislocation density of crystal grown when the melt does not contact with the wall of the crucible during space growth is close to zero and the melt and the crucible The dislocation density rapidly increases after the contact of the wall, and the growth and the research of the crystal are described in detail. The influence of microgravity on the crystal growth is analyzed, and the development of space crystal growth is put forward.