可再生能源2024，Vol.42Issue(10)：1313-1324,12.
定向凝固进程与相变界面预测模型的解析研究与实验——以太阳能级多晶硅为例
Analytical research and experiment on prediction model of directional solidification process and phase transition interface:solar-grade polysilicon
摘要
Abstract
It is difficult to control and predict the solidification process and the morphology of phase transition interface in sealed directional solidification.The directional solidification(D-S)process model of solar-grade polysilicon is solved by analytic method,and a high precision mathematical model of solidification process is obtained.The solidification height,instantaneous solidification rate and melt temperature distribution can be calculated from the easily measured heat dissipation temperature and solidification time.By solving the Poisson equation,a 3D model of phase transition interface was established.It is revealed that the heat flow rate q value on the side wall of the melt is the key factor to influence the interface morphology,which provided quantitative analysis basis for solidification process control.The large size(0.90 m×0.90 m×0.35 m)ingot casting experiments were carried out using 3303 industrial silicon as raw material in YITIPV vacuum ingot furnace.For the geometrically symmetric phase transition interface,the maximum deviation between the mathematical model and the experimental curve is 4.43%;for the irregular phase transition interface,the maximum deviation is 8.68%,and the solidification process model is modified according to the experimental results.The prediction accuracy and reliability of the 3D phase transition interface model were verified by detecting the parameters such as impurity content,resistivity and minority carrier lifetime,and comparing the typical phase transition interface morphologies of the four ingots.关键词
多晶硅/定向凝固/数学模型/解析解/相变界面Key words
polysilicon/directional solidification/mathematical model/analytical solution/phase transition interface分类
数理科学引用本文复制引用
朱徐立,谢连发,黄丹辉,陈民恺..定向凝固进程与相变界面预测模型的解析研究与实验——以太阳能级多晶硅为例[J].可再生能源,2024,42(10):1313-1324,12.基金项目
厦门市自然科学基金项目(3502Z202374052). （3502Z202374052）
