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首页> 外文期刊>Journal of Crystal Growth >Numerical simulation of oxygen transport during the Czochralski silicon crystal growth with a cusp magnetic field
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Numerical simulation of oxygen transport during the Czochralski silicon crystal growth with a cusp magnetic field

机译:尖端磁场下直拉硅晶体生长过程中氧输运的数值模拟

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摘要

A numerical simulation has been performed to investigate the effect of a cusp magnetic field on the melt flow, thermal field and oxygen concentration during the Czochralski silicon crystal growth process. The results show a decrease in the oxygen concentration due to the reduction in size of the secondary flow cell that formed between the Taylor-Proudman vortex and the buoyancy-driven one. There is a significant reduction in the size of the secondary flow cell when the magnetic field is applied. As a consequence of the higher strength of the magnetic field there is a significant decrease in the oxygen concentration along the melt-crystal surface. The oxygen concentration is also very sensitive to the crucible rotation rate. There is an optimum crucible rotation rate for obtaining the lowest oxygen concentration. The oxygen concentration is lower for higher argon flow rate. The oxygen concentration decreases as the zero-Gauss plane (ZGP) moves from the free surface towards crucible bottom. When the ZGP is far from the free surface, the secondary flow cell appears and then the oxygen concentration increases. There is an optimum position of the ZGP to obtain the lowest the oxygen concentration.
机译:进行了数值模拟,以研究尖峰磁场对切克劳斯基硅晶体生长过程中熔体流动,热场和氧浓度的影响。结果表明,由于在Taylor-Proudman涡流和浮力驱动的涡流之间形成的二次流通池的尺寸减小,氧气浓度降低。当施加磁场时,次级流通池的尺寸显着减小。由于较高的磁场强度,沿熔融晶体表面的氧气浓度显着降低。氧气浓度对坩埚旋转速度也非常敏感。为了获得最低的氧气浓度,存在最佳的坩埚转速。对于较高的氩气流速,氧气浓度较低。随着零高斯平面(ZGP)从自由表面向坩埚底部移动,氧浓度降低。当ZGP远离自由表面时,会出现二次流通池,然后氧气浓度增加。 ZGP处于最佳位置,以获得最低的氧气浓度。

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