Patent ID: 6716365
Filing Date: 2004-04-06
Classification: H01L

Abstract:
A method for etching a wafer-like object that has a first surface and a second surface, wherein the first and second surfaces face in the opposite direction, the method comprising steps of:forming a protective film on the first surface of the wafer-like object; placing the wafer-like object, on which the protective film is located, between a base member and an etching bath cylinder such that the second surface faces the etching bath cylinder, wherein the protective film on the first surface defines a ceiling of a hermetic room and the second surface defines a bottom of an etching chamber; supplying an etchant into the etching chamber; and etching an unmasked etching portion of the wafer-like object from the second surface to a specified thickness while applying a first pressure to the protective film by supplying gas into the hermetic room, wherein in the etching, the etchant is supplied to the etching portion to apply a second pressure to the etching portion, the first pressure being larger than the second pressure.