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首页> 外文期刊>Journal of Crystal Growth >Influence of ampoule rotation on three-dimensional convection and segregation in Bridgman crystal growth under imperfect growth conditions
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Influence of ampoule rotation on three-dimensional convection and segregation in Bridgman crystal growth under imperfect growth conditions

机译：不完全生长条件下安瓿旋转对布里奇曼晶体生长中三维对流和偏析的影响

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摘要

Three-dimensional (3D) convection and segregation due to imperfect growth conditions, such as ampoule tilting and asymmetric heating, are common problems in vertical Bridgman crystal growth. How to suppress the 3D effects has been an important task for better growth control. To investigate the possibility of using steady ampoule rotation to damp the 3D flows, numerical simulation is conducted. It is found that the low-speed rotation (e.g., 10 RPM) can reduce significantly the 3D flows, but may result in larger radial segregation due to less dopant mixing, as well as rotational growth and melting. For weaker convection, which corresponds to a low-thermal-gradient or reduced-gravity growth, ampoule rotation is particularly effective. This is especially true in space, where the 3D flows and segregation induced by an arbitrary residual gravity can be significantly suppressed by only several RPM of ampoule rotation leading to a nearly diffusion-controlled growth. However, if the growth interface is not axisymmetric, which is often caused by an asymmetric heating, rotational segregation can be quite severe, even without the buoyancy convection.
机译：由于不理想的生长条件（例如安瓿倾斜和不对称加热）而导致的三维（3D）对流和偏析是垂直Bridgman晶体生长中的常见问题。如何抑制3D效果一直是更好地控制生长的重要任务。为了研究使用稳定的安瓿瓶旋转来阻尼3D流量的可能性，进行了数值模拟。已经发现，低速旋转（例如10RPM）可以显着减少3D流动，但是由于较少的掺杂剂混合以及旋转生长和熔化而可能导致更大的径向偏析。对于较弱的对流，这对应于低温度梯度或重力降低，安瓿旋转特别有效。这在空间中尤其如此，在该空间中，仅通过几个安瓿旋转速度（RPM）即可导致几乎由扩散控制的增长，从而显着抑制了3D流动和任意残余重力引起的偏析。但是，如果生长界面不是轴对称的（通常是由不对称加热引起的），则即使没有浮力对流，旋转偏析也会非常严重。

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