Baotou City Shansheng New Energy Co.

Mongolia, China

Baotou City Shansheng New Energy Co.

Mongolia, China
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Liu T.,CAS Institute of Semiconductors | Dong Z.,CAS Institute of Semiconductors | Zhao Y.,CAS Institute of Semiconductors | Wang J.,CAS Institute of Semiconductors | And 5 more authors.
Journal of Crystal Growth | Year: 2012

A large cold crucible has been used to purify metallurgical silicon in an induction heating furnace. Melt and directional solidification of more than 200 kg metallurgical silicon melt are realized by controlling down speed of the cold crucible relative to an induction coil. Metal impurity content in metallurgical silicon is reduced to a very low level, typically below 0.05 ppmw for transition metals like iron. The total processing time is within 30 h, and the mass ratio is higher than 70%. A numerical model is set up to reveal the electromagnetic field, the temperature distribution and the flow field. This purifying method could remove metal impurities effectively and has advantages of low contamination and low cost by avoiding use of graphite and quartz crucibles. © 2012 Elsevier B.V.


Liu T.,CAS Institute of Semiconductors | Dong Z.,CAS Institute of Semiconductors | Zhao Y.,CAS Institute of Semiconductors | Wang J.,CAS Institute of Semiconductors | And 5 more authors.
Journal of Crystal Growth | Year: 2012

The large size electron beam furnace has been used to remove phosphorus from metallurgical grade silicon pretreated with effective removal of boron and metals. The content of phosphorus decreases from 15 ppmw to about 0.1 ppmw after the electron beam treatment in a short time. More than 500 kg silicon is melted and purified in the furnace in a run, indicating its feasibility for large scale industry application. The purified UMG silicon was casted into multicrystalline silicon ingot by a standard technology and multicrystalline silicon wafers were obtained for solar cell fabrication. By using a commercial production line, solar cells made from the multicrystalline silicon wafers exhibit good performance with an average conversion efficiency of 16.1%. © 2012 ElsevierB.V. All rights reserved.

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