Earth optimization of space experiment on growth of germanium by floating-zone technique with the use of rotating magnetic fields
Earth optimization of space experiment on growth of germanium by floating-zone technique with the use of rotating magnetic fields
复制标题
利用旋转磁场浮区技术生长锗的空间实验的地球优化
DOI：
10.1134/1.1343144
复制
发表时间：
2001
影响因子：
0.7
通讯作者：
V. V. Rakov
中科院分区：
文献类型：
--
作者：
A. Kartavykh;É. S. Kopeliovich;M. G. Mil’vidskiĭ;V. V. Rakov
该结果考虑了直径为 15 毫米、长度为 60 毫米的高纯度掺 Ga 锗单晶生长的地球实验，这些实验是在 Zona-4“太空炉”中进行的，其技术体制接近于太空轨道上现有的技术体制。结果表明，通过浮区技术在半导体结晶过程中使用磁流体动力学（MHD）因子[弱（0.15-0.2 mT）旋转（400 Hz）磁场]是控制生长晶体中的掺杂剂分布和电物理性质的一种非常有前途的方法。结果表明，在这样的磁场中，Ga在Ge中的有效分布系数降低了10%。在熔体的 MHD 搅拌生长过程中，补偿半导体中残余掺杂剂的施主-受主平衡的转变首先在未掺杂的锗单晶的生长中建立。还确定磁场对未掺杂和掺杂晶体的电阻率微观不均匀性产生不同的影响。讨论了 MHD 对生长晶体特性的影响机制以及在航天器上进行类似实验的前景。预计在微重力条件下，地面实验所揭示的效果会更加明显。
The results are considered of the earth experiments on growth of high-purity and Ga-doped germanium single crystals 15 mm in diameter and 60 mm in length, which were performed in a Zona-4 “space furnace” under the technological regimes close to those existing in space orbits. It is shown that the use of a magnetohydrodynamic (MHD) factor [weak (0.15–0.2 mT) rotational (400 Hz) magnetic fields] during crystallization of semiconductors by the floating-zone technique is a very promising method for control of dopant distributions and electrophysical properties in a growing crystal. It is shown that in such magnetic fields, the effective coefficient of Ga distribution in Ge decreases by 10%. The shift of the donor-acceptor balance of the residual dopants in a compensated semiconductor during growth with the MHD-stirring of the melt was first established in growth of undoped germanium single crystals. It was also established that magnetic fields produce different effects on the resistivity microinhomogeneity in undoped and doped crystals. The mechanisms of the MHD effect on the properties of the grown crystals are discussed as well as the perspectives of performing analogous experiments aboard spacecrafts. It is predicted that, under the microgravitation conditions, the effects revealed in terrestrial experiments would be more pronounced.