Silicon feedstock for solar cells
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United States of America Patent
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Apr 26, 2011
Grant Date -
Aug 28, 2008
app pub date -
Apr 23, 2008
filing date -
Dec 29, 2003
priority date (Note) -
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Abstract
The silicon feedstock for solar cells is made from metallurgical grade silicon by the successive steps of treating the silicon with a calcium-silicate slag, solidifying the treated silicon, leaching the solid silicon with acid, remelting the leached silicon, resolidifying the remelted silicon into an ingot, removing the upper part of the ingot and then crushing and sizing.
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