垂直布里奇曼法Cd_(1-x)Mn_(x)Te晶体生长过程的数值模拟与实验研究  

Numerical Simulation and Experimental Study on the Growth Process of Cd_(1-x)Mn_(xTe) Crystal by Vertical Bridgman Method

作　　者：张頔 栾丽君[1] 李龙 杨禄丰 俞鹏飞 段理[1] Zhang Di;Luan Lijun;Li Long;Yang Lufeng;Yu Pengfei;Duan Li(School of Materials Science and Engineering,Chang’an University,Xi’an 710061,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710061

出　　处：《稀有金属材料与工程》2023年第7期2540-2548,共9页Rare Metal Materials and Engineering

基　　金：陕西省国际科技合作计划重点项目(2020KWZ-008);中央高校基本科研业务费专项资金(300102312401)。

摘　　要：为经济高效获得Cd_(1-x)Mn_(x)Te晶体垂直布里奇曼法(vertical Bridgman method,VBM)生长条件,基于有限元软件建立二维有限体积数值模型,模拟了VBM生长Cd_(1-x)Mn_(x)Te的晶体过程;探究坩埚内部熔体的传热、流动以及生长界面变化情况,分析5、10和15 K/cm 3种不同温度梯度条件对固液界面的影响。结果表明,晶体生长初期,固液界面径向流速差较大,从而使生长界面略凹向晶体;随着晶体生长的进行,固液界面逐渐平缓,开始有利于良好晶体的生长;在生长中后期,固液界面变为凸面,随着温度梯度的增大,可以更好地抑制对流,有利于获得高质量晶体。在模拟结果的基础上,调整不同阶段坩埚下降速度,进行Cd_(0.9)Mn_(0.1)Te晶体的制备,成功地生长出质量良好的Cd_(0.9)Mn_(0.1)Te晶体。The growth process of Cd_(1-x)Mn_(xTe) crystal by vertical Bridgman method(VBM) was simulated in detail by Fluent software.A two-dimensional finite volume numerical model was established to discuss the heat transfer,flow and growth interface of the melt in the crucible.The effects of temperature gradient conditions(5,10 and 15 K/cm) on the solid-liquid interface were analyzed.The results show that in the early stage of crystal growing,the radial flow velocity difference at solid-liquid interface is large,so that the interface is slightly concave to the crystal.As the crystal growing proceeds,the solid-liquid interface gradually flattens and begins to favor the growing of good crystals.In the middle and late stages,the solid-liquid interface becomes convex,and with the increase in temperature gradient,convection can be better suppressed,which is the favorable condition for obtaining high-quality crystals.The experimental conditions were optimized according to the simulation results,by adjusting the movement speed of the crucible at different growing stages,Cd_(0.9)Mn_(0.1)Te crystals with good quality were finally grown.

关 键 词：垂直布里奇曼法 Cd_(1-x)Mn_(x)Te晶体 有限体积 温度梯度 熔体流动 

分 类 号：O782[理学—晶体学]