Journal
CRYSTALS
Volume 12, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/cryst12040562
Keywords
casting silicon; oxygen and carbon impurities; numerical simulation; heat and mass transfer; solar cells
Funding
- Key Research and Development Program of Jiangsu Province of China [BE2019009-003]
- Industry-University-Research Project (Wuxi Suntech Solar Power Co., Ltd.) [8421130025]
- National Natural Science Foundation for Young Scholars of China [51206069]
Ask authors/readers for more resources
An argon gas diversion system is proposed to reduce oxygen and carbon impurities during silicon casting. Numerical simulations were conducted to investigate the effects of different parameters on impurity reduction. The results showed that the system effectively suppressed backflow, reduced CO generation, and decreased impurity penetration into the silicon melt. The optimal parameter combination was determined through orthogonal experiments.
To reduce oxygen and carbon impurities while casting silicon, an argon gas diversion system is proposed. A series of two-dimensional global transient numerical simulations are carried out using Fluent software according to the orthogonal experimental design, including heat transfer, convection of silicon melt and argon gas, and the fully coupling transport of impurities. The numerical results show that when the distance between the outer tube outlet and the cover is 10 mm, the backflow is inhibited by lateral outflow, thus the generation of CO is suppressed and the penetration of impurities into the silicon melt is decreased. The larger the flow rate, the more obvious the effect is. When the outer tube outlet is far from the cover, the effect of removing impurities is no longer significant. In addition, too large or too small an inner tube flow rate is not conducive to impurity reduction. The optimal parameter combination of outer tube flow rate, inner tube flow rate, and the distance between outer tube outlet and the cover are determined by the orthogonal experiment. Compared with the original furnace, the average concentration of oxygen and carbon in casting silicon ingots could be decreased by 7.4% and 59.9%, respectively, by using the optimized argon gas diversion system.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available