| 摘要 |
PROBLEM TO BE SOLVED: To provide a silicon purification method comprising an efficient boron removal method for preparing solar cell-grade silicon and to provide a silicon purification apparatus. SOLUTION: Provided is a silicon purification method comprising melting crude silicon in a crucible placed in a melting furnace to remove impurities from the crude silicon, wherein in the crucible at least one boride object comprising a boride is in contact with the crude silicon containing an elementary metal identical with the metallic element constituting the boride, whereupon the B concentration in the metal-grade silicon can easily decrease to the B concentration in solar cell-grade silicon. COPYRIGHT: (C)2008,JPO&INPIT
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