Multicrystalline silicon ingots, silicon masteralloy, method for increasing the yield of multicrystalline silicon ingots for solar cells
AssigneeRec Solar Norway AS
InventorsGunnar HALVORSEN, Anne-Karin SOILAND
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Abstract
The present invention comprises directionally solidified multicrystalline silicon ingots, a silicon masteralloy for increasing the efficiency of solar cells made from wafers cut from the silicon ingots, method for increasing the yield when producing multicrystalline silicon ingots from a silicon melt by directional solidification. Further the present invention comprises a method for preparing said silicon masteralloy.
Claims8
A method for increasing the yield of directional solidified multicrystalline silicon ingots comprising adding elemental calcium is added to a silicon melt in an amount chosen from at least one of the following ranges:
- 5-9.99 ppmw, 10-500 ppmw, 500-550 ppmw prior to subjecting the silicon melt to directional solidification in a crucible.
A silicon masterally for addition to a silicon melt when making directionally solidified multicrystalline silicon ingot to increase yield and electrical properties of the ingo, wherein said silicon masteralloy comprises elemental calcium in an amount chosen from at least one of the following ranges:
- 0.5-20 weight %, 1-15 weight %, 5-15 weight %, the remaining being high purity silicon.
Dependencies are inferred from the claim text.