MULTICRYSTALLINE SILICON INGOTS, SILICON MASTERALLOY, METHOD FOR INCREASING THE YIELD OF MULTICRYSTALLINE SILICON INGOTS FOR SOLAR CELLS

摘要

The present invention concerns a directional solidified multicrystalline silicon ingot with minimized red zone and thereby increased yield and electrical properties. The ingot comprises elemental calcium added to a silicon melt in an amount chosen from at least one of the following ranges: 5-9.99 ppmw, 10-500 ppmw or 500-550 ppmw. The claimed invention also relates to a silicon masteralloy, a method for increasing the yield of directional solidified multicrystalline ingots, a method for preparing a silicon masteralloy and the use of a master alloy for increasing yield and electrical properties of an ingot.