Patent ID: 8097080
Filing Date: 2012-01-17
Classification: B28D,H01L,Y10S,Y10T

Abstract:
1. A method of separating single crystals, particularly of plates, wafers or parts thereof, comprising: pre-adjusting a crystallographic cleavage plane relative to a cleavage device; determining a stress intensity using at least one stress field; for the at least one stress field, determining an energy release rate G(α) dependent on a possible deflection angle from the cleavage plane upon crack propagation in a single crystal; generating the at least one stress field, wherein G(0)≧2γ wherein: α denotes the possible deflection angle from the cleavage plane upon crack propagation, α G(α) denotes the mechanical-energy-release rate dependent on a deflection of the crack from the cleavage plane about angle α, γ γ β h denotes a step height (material specific).