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计算模拟了加速坩埚旋转技术Bridgman(ACRT-B)法碲锌镉单晶体生长过程,研究了ACRT波形参数对固液界面形状和晶体组分偏析的影响.计算结果表明:ACRT波形参数的变化显著影响固液界面凹陷和界面前沿温度梯度增加的幅度,增加幅度最高可达数倍.坩埚最大转速的增加不能明显改善晶体的径向组分偏析,而坩埚加速时间、恒速转动时间和减速时间的变化可以显著影响溶质的偏析行为.适当的波形参数,ACRT可以显著地减小晶体的径向组分偏析,直至为零.反之,ACRT可显著增加晶体的径向组分偏析和轴向组分偏析.调整ACRT波形参数和生长系统的控制参数,可以制备溶质组分均匀区占较大比率的单晶体.
The effects of ACRT waveform parameters on the shape of solid-liquid interface and the segregation of crystal components were studied by calculating the Bridgman (ACRT-B) method with accelerated crucible rotation technique. The calculated results show that the ACRT waveform parameters have significant influence The increase of the gradient of the solid-liquid interface depression and the front edge of the interface can increase several times, and the increase of the maximum rotation speed of the crucible can not obviously improve the radial component segregation of the crystal, while the crucible acceleration time, the constant rotation time and the deceleration time ACRT can significantly reduce the segregation of the radial components of the crystal until it reaches zero. On the contrary, ACRT can significantly increase the radial component segregation and the axial component of the crystal Segregation.Adjusting the parameters of ACRT waveform and the control parameters of the growth system, a single crystal with a uniform proportion of solute components can be prepared.