| 摘要 |
PROBLEM TO BE SOLVED: To provide a casting method for polycrystalline silicon by which production cost can be reduced and solar cells having high conversion efficiency can be obtained. SOLUTION: In the continuous casting method for polycrystalline silicon in which a bottomless cooling crucible with a part of a certain length in an axial direction being circumferentially and multiply sectioned is provided inside an induction coil, producing a silicon melt within the cooling crucible by means of electromagnetically induced heating by the induction coil, and withdrawing the silicon melt in a downward direction while being solidified, an alternating current with a frequency of 25-35 kHz is applied on the induction coil. According to the casting method for polycrystalline silicon, in addition to preventing rapid cooling of the ingot surface at the time of solidifying the molten silicon and producing the ingot, the stirring of the molten silicon inside the crucible is suppressed to thereby promote the growth of large diameter crystals, with the result that the conversion efficiency of the cast polycrystalline silicon used as solar cells is increased. COPYRIGHT: (C)2008,JPO&INPIT
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