Process for preparing silicon melt from polysilicon charge
A technology of polysilicon and silicon melt, which is applied in the field of preparing silicon melt for growing monocrystalline silicon ingots and preparing molten silicon melt, which can solve the problems of increasing defects
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[0031]In accordance with the method of the present invention, chunk polycrystalline silicon is first charged into a Chowklarski crucible and melted to form a partially molten charge comprising both molten silicon and unmelted chunk silicon. Although the geometry of the crucible is not strictly specific, it should generally have inner and outer surfaces defining an at least partially open structure capable of containing or otherwise retaining a liquid, such as molten silicon. Referring now to FIG. 1 , an example silica crucible 10 generally has an inner surface 12 , an outer surface 14 , a centerline 16 and a top edge 18 . The inner surface 12 defines an open cavity for adding bulk polysilicon. Crucible 10 includes a bottom portion 22, corner portions 24 and side wall structures 26, hereinafter referred to as crucible bottom 22, corners 24 and side walls 26, respectively. The radius, R, of the crucible is measured radially outward from the centerline 16 to the inner surface of...
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