VB法生长CdZnTe晶体的放肩角度优化  

Optimization of shoulder angle for CdZnTe crystal grown by VB method

作　　者：上官旻杰 袁文辉 梁红昱 汪帅 饶吉磊 万佳琪 黄立 SHANG GUAN-Min jie;YUAN Wen-hui;LIANG Hong-yu;WANG Shuai;RAO Ji-lei;WAN Jia-qi;HUANG Li(Wuhan Global Sensor Technology Co,Ltd,Wuhan 430000,China)

机构地区：[1]武汉高芯科技有限公司,湖北武汉430000

出　　处：《激光与红外》2023年第10期1555-1561,共7页Laser & Infrared

摘　　要：基于有限元法构建了CdZnTe晶体生长模型,分析了不同放肩角度下固液界面的形态演变。模拟结果表明,放肩角度变化导致了放肩区域内温度梯度分布的变化,进而改变了该区段的固液界面形态。在60°/90°/120°/150°四种放肩角度中,120°能在放肩段得到最平坦的固液界面。随着生长进行,不同角度下固液界面的形态差异逐渐减小,在主体生长中所有界面形状趋于一致。根据模型参数进一步实施了CdZnTe晶体的生长实验,结果表明,在90°/120°/150°三种放肩角度中,120°放肩时晶锭头部的单晶率更高。In this paper,the growth model of CdZnTe crystal is constructed based on the finite element method and the morphological evolution of the solid liquid interface under different shoulder angles is analyzed.The simulation results show that the change of the shoulder angle leads to the change of temperature gradient distribution in the shoulder area,which in turn changes the solid liquid interface morphology in the section.Among the four shoulder angles of 60°/90°/120°/150°,120°can obtain the flattest solid liquid interface of shoulder segment.As the growth proceeds,the difference of interface morphology corresponding to different angles gradually decreases,and all interface shapes tend to be consistent in the main ingot growth.The growth experiment of CdZnTe crystal is further carried out according to the model parameters.The results show that among the three shoulder angles of 90°/120°/150°,the single crystal rate of the ingot head is higher when the shoulder angle is 120°.

关 键 词：碲锌镉晶体 垂直布里奇曼法 放肩角度 数值模拟 生长固液界面 

分 类 号：O782[理学—晶体学] TN213[电子电信—物理电子学]