中国科学院大学学报 ›› 2007, Vol. 24 ›› Issue (2): 161-166.DOI: 10.7523/j.issn.2095-6134.2007.2.004
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石科峰 卢文强
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SHI Ke-Feng, LU Wen-Qiang
College of Physics science, Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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摘要： 本文以HgCdTe化合物的晶体生长为例，针对竖直Bridgman晶体生长过程，数值模拟了液相区界面处溶质分凝产生的溶质扩散边界层随拉晶速度和初始浓度的变化情况。结果表明：在拉晶速度从小变大的情况下，相变界面处溶质扩散受到抑制，浓度边界层变得越来越薄；当初始浓度不同时，分凝系数的变化决定了晶体生长过程中析出成分的多少，从而影响到液相区的溶质扩散情况，随着初始浓度的增大，溶质边界层有变薄的趋势，并且当初始浓度较大时这种趋势更为明显。
关键词: Bridgman晶体生长, 分凝系数, 边界层
Abstract: Abstract: A numerical study is presented of the Bridgman crystal growth process of HgCdTe. Numerical results are reported for the effect of the pull rate and initial concentration on the solutal boundary layer near the interface. The results show that the solute diffusion will be restrained and the boundary layer becomes thin as the pull rate increases. Moreover, the variety of initial concentration lead to the change of segregate coefficient, which can affects the quantity of solute segregated during growth process, so that affect the solute diffusion. As a result, the solutal boundary layer is attenuated with the increase of initial concentration and this change is obvious when initial concentration is large.
Key words: Bridgman crystal growth, segregate coefficient, boundary layer
中图分类号:
O551
石科峰 卢文强. 化合物晶体Bridgman生长过程中的溶质再分布[J]. 中国科学院大学学报, 2007, 24(2): 161-166.
SHI Ke-Feng, LU Wen-Qiang. Solute redistribution during the Bridgman growth of compound crystal[J]. , 2007, 24(2): 161-166.
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链接本文: http://journal.ucas.ac.cn/CN/10.7523/j.issn.2095-6134.2007.2.004
http://journal.ucas.ac.cn/CN/Y2007/V24/I2/161
