Patent ID: 9109302
Filing Date: 2015-08-18
Classification: C30B,H01L,Y02E,Y02P

Abstract:
1. A method for producing silicon wafers, comprising the steps of: providing a silicon monocrystalline seed in the bottom area of a crucible, the silicon monocrystalline seed having a seed surface with a <110>-crystal orientation, the <110>-crystal orientation being perpendicular to the bottom area of the crucible, and an edge surface with a <100>-crystal orientation, the <100>-crystal orientation being perpendicular to a side face of the crucible; surface-melting silicon and providing it in the crucible; solidifying the liquid silicon starting from the bottom area of the crucible on the seed surface of the silicon monocrystalline seed to form a silicon block, whereby the silicon block takes over the <110>-crystal orientation and as a structure which is more than 70% monocrystalline; and dividing the silicon block into wafers in such a way that a main wafer surface comprises a <100>-crystal orientation, the main wafer surface being delimited by four wafer edges, wherein two respectively opposite wafer edges of the four wafer edges run parallel to the [110]-crystal direction.