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论文类型：期刊论文

发表时间：2017-11-01

发表刊物：VACUUM

收录刊物：EI、SCIE、Scopus

卷号：145

页面范围：251-257

ISSN号：0042-207X

关键字：Silicon; Directional solidification; Distribution of impurity; Fluctuant growth rate

摘要：A theoretical model to determine distribution of iron impurity during silicon purification by directional solidification with fluctuant crystal growth rate is proposed in this paper. The crystal growth rate is fluctuant usually and it has profound effect on the distribution of iron impurity in practical production. The model validation by the distribution of iron impurity during silicon purification by directional solidification in industrial production and the results show that the calculation agrees with existing experimental results. The results also indicate that distribution of iron impurity is directly correlated with the instantaneous value of crystal growth rate. The high fluctuant distribution of iron impurity during silicon purification by directional solidification can be well explained. Many potential applications of the model in practical production are found, such as predicting the distribution of iron impurity with fluctuant crystal growth rate, evaluating the effect degree of production accident, design and optimization of the process parameters and evaluating of maximum yield for raw silicon with different impurity concentration. Silicon purification with low energy consumption is possible based on the research in this paper. (C) 2017 Elsevier Ltd. All rights reserved.