Now most polycrystalline silicon is produced by Siemens method which is used to produce electronic grade silicon, and their more environment load and high cost has blocked development of photovoltaic industry. The characteristics of metallurgy purification method is lower cost, simple process, little equipment investment and less environment load, the method is hotspot research process in the world. Vacuum directional solidification is one process of metallurgy purification method (authorized patent number:...
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