天宫二号碲化锌晶体生长

在天宫二号飞船综合材料实验炉六工位采用碲熔剂法生长了碲化锌晶体，生长时最高温度为800℃，以0.5mm·h^-1的提拉速度向炉膛内部提拉生长晶体.飞行实验后，用相同实验参数在地面进行了对比实验.结果发现，空间样品尾部有一个非常大的橙色结晶区域（约10mm×6mm×2mm），而地面生长样品中碲化锌晶体尺寸仅为约3mm×3mm×1mm，空间生长的碲化锌晶粒尺寸明显优于地面.空间微重力环境下，由于毛细作用，空间样品的塞子处有Te和ZnTe的外延膜生成.而地面生长的锭条在塞子处只有零星点状气相生产物.因此微重力条件有利于碲化锌晶体材料的生长.

Growth of ZnTe Crystal in Microgravity on Tiangong-2 Spaceshipormalsize

Zinc telluride crystal was grown by Te-solvent method in microgravity on Tiangong-2 spaceship in 2016. The growth temperature is 800℃, and the growth rate is 0.5mm·h-1. A ground-truth experiment was performed following the space experiment, and a comparison between the two samples was studied. An orange ZnTe crystal (its size is about 10mm×6mm×2mm) can be found in the space sample. It is shown that the crystal size of space sample is larger than that of the ground sample. Because of the capillary phenomenon in microgravity, Te and ZnTe film were grown at the surface of the silicon rod of the space sample. However, a little bit of gaseous product was found at the ground sample. This result underlines the importance of microgravity for crystal growth of Group Ⅱ~VI semiconductor material. It gives the positive guidance on the growth of infrared semiconductor materials on ground such as HgCdTe, CdZnTe and ZnTe.