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Ma X.,Tsinghua University | Zheng L.,Tsinghua University | Zhang H.,Tsinghua University | Zhao B.,Jinggong Science and Technology Co. | And 2 more authors.
Journal of Crystal Growth | Year: 2011

This paper reports numerical investigation of multicrystalline silicon (mc-Si) ingot production using an industrial-scale directional solidification furnace capable of producing 500 kg silicon ingot. Specific examination is made on thermal distribution, interface shape and velocity field. Evaluation is performed for the applicability of thermal system design to reduce carbon and oxygen impurity, improve crystal quality and enhance energy efficiency. The effects of gas flow, heater position and geometric configuration on temperature distribution are discussed as well to provide the essential knowledge for system optimization. © 2010 Elsevier B.V.


Zhang H.,Tsinghua University | Zheng L.,Tsinghua University | Ma X.,Tsinghua University | Zhao B.,Jinggong Science and Technology Co. | And 2 more authors.
Journal of Crystal Growth | Year: 2011

Directional solidification and casting systems used in silicon production are reviewed first. Common and distinguished features are summarized, and the problems appearing at nucleation and bulk growth stages are discussed. The relationship between growth rate and temperature in the heat exchanger block for an industrial growth system is developed and the predicted results are compared with experimental measurements. A commercial industrial system is simulated to study fluid flow and heat transfer in the growth system, and hot zone design is optimized. Suggestions are made for further improvement of industrial silicon casting systems. © 2010 Elsevier B.V.

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