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US 10,483,428 B2Granted
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.
Claims5
A directionally solidified multicrystalline silicon ingot obtained by adding elemental calcium to a high purity 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 directional solidification,
- wherein the ingot comprises reduced red zone along an outer part of an uncut ingot at a lower end, an upper end and/or sides of the ingot, compared to a directionally solidified ingot obtained without adding elemental calcium prior to directional solidification.
Dependencies are inferred from the claim text.