METHOD FOR CASTING POLYCRYSTALLINE SILICON

摘要

Disclosed is a method for casting polycrystalline silicon used as a substrate material for solar cells that reduces the amount of metal carried in when supplying raw material to a crucible. Said method for casting polycrystalline silicon uses a bottomless cooling crucible and continuously casts polycrystalline silicon by electromagnetic induction. High-purity silicon with a maximum particle diameter of 40 mm, wherein 0% to 40% of the particles have a diameter 0.6 to 3 mm and 100% to 60% of the particles have a diameter greater than 3 mm and up to 40 mm, is used as the raw material. This reduces contamination by heavy metals and enables polycrystalline silicon used as substrate material for solar cells that can maintain a good conversion efficiency to be readily produced using an electromagnetic casting device that uses a simple and small raw material supply pipe.