Patent ID: 8460465

Claim:
A support ring for supporting a semiconductor wafer comprising monocrystalline silicon during a thermal treatment of the semiconductor wafer, the support ring having an external diameter and an internal diameter, comprising a ring having an outer and an inner lateral surface and a curved surface extending from the outer to the inner lateral surface, the curved surface serving for placement of a semiconductor wafer, wherein the curved surface has a radius of curvature of not less than 6000 mm and not more than 9000 mm, if the curved surface is designed for placement of a semiconductor wafer having a diameter of 300 mm, or has a radius of curvature of not less than 9000 mm and not more than 14,000 mm, if the curved surface is designed for the placement of a semiconductor wafer having a diameter of 450 mm, and wherein the curved surface has a material proportion Rmr(t) of not less than 85% at a material depth t of 2 μm.