Patent ID: 7659207

Claim:
A method for producing epitaxially coated silicon wafers, in which a multiplicity of silicon wafers having a front side and a rear side are polished at least on a front side thereof, comprising successively and individually coating said wafers in an epitaxy reactor, wherein one silicon wafer is placed on a susceptor in the epitaxy reactor, is pretreated under a hydrogen atmosphere in a first step, and with addition of an etching medium to the hydrogen in a second step, is subsequently coated epitaxially on its polished front side, and is removed from the epitaxy reactor, wherein an etching treatment of the susceptor is effected after a specific number of epitaxial coatings, and the susceptor is hydrophilized after said etching treatment, wherein the silicon wafers have a front side and a rear side, at least the front sides being polished, and an epitaxial layer applied at least the front sides, the wafers having a maximum local flatness value SFQR max of 0.01 μm to 0.035 μm relative to at least 99% of the partial regions of an area grid of measurement windows having a size of 26×8 mm 2 on the front sides of the coated silicon wafers, with an edge exclusion of 2 mm, having a maximum local flatness value SFQR max of 0.01 μm to 0.035 μm relative to at least 99% of the partial regions of an area grid of measurement windows having a size of 26×8 mm 2 on the front side of the coated silicon wafer with an edge exclusion of 2 mm.