Patent ID: 8066896

Claim:
A method for etching a wafer by a single-wafer process, comprising: performing etching of a wafer sliced from a silicon single crystal ingot by supplying an etching fluid on the wafer while horizontally holding and rotating the wafer on a wafer-chuck; blowing off the etching fluid flowing down over an edge portion of the wafer placed on the wafer-chuck in the outward radial direction away from the wafer and scattering the etching fluid in an upper oblique direction by injection of a gas and by guiding the etching fluid utilizing an annular guide rim that protrudes from an upper portion of a circumferential edge of the wafer-chuck; and performing aspirating of the etching fluid such that the etching fluid blown off and scattered by the gas and an etching fluid scattered by the centrifugal force caused by the rotation of the wafer are both aspirated together with the gas.