NDLI: Numerical Study of von Mises Stress During Continuous Casting of Multicrystalline Silicon With Large-Size Grains

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Fang, H. S. Li, C. F. Zheng, L. L. Zhao, C. J. Xie, Y. S.
Copyright Year	2013
Abstract	Continuous casting is a promising technique for massive production of multicrystalline silicon (mc-Si). A theoretically advanced study is performed here to investigate the growth of mc-Si with large grain size, which has much higher photoelectric efficiency than normal mc-Si. However, the casting technique results in high thermal stresses due to its inherent features, and limits the photovoltaic applications of mc-Si because of the stress-induced dislocations. For the analysis and optimization of dislocation formation, a computer-aided method has been applied to investigate thermal stress distribution in the growing ingot of continuous casting. The regions of dislocation multiplication are evaluated by comparing von Mises stress to the critical resolved shear stress. It is found that the stress levels are especially high in the regions close to the solid and liquid (S/L) interface, and that the mold wall has a significant effect on the von Mises stress distribution if the billet were attached on the wall. The triple point is better to keep below the mould bottom to avoid its effect during the growth by certain techniques during the industrial production. Parametric studies were further performed to discuss the effects of growth conditions, such as sheath height, environment temperature, and pulling rate on the distribution of the maximum von Mises stress in the billet. The results imply theoretically that multicrystalline silicon with low stress-induced dislocation could be produced by continuous casting with strictly controlled growth parameters.
File Format	PDF
ISBN	9780791856345
DOI	10.1115/IMECE2013-62182
Volume Number	Volume 8A: Heat Transfer and Thermal Engineering
Conference Proceedings	ASME 2013 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2013-11-15
Publisher Place	San Diego, California, USA
Access Restriction	Subscribed
Subject Keyword	Grain size Casting Computer-aided engineering Stress concentration Temperature Shear stress Silicon Stress Thermal stresses Optimization Dislocations
Content Type	Text
Resource Type	Article

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