Patent ID: 6149759
Filing Date: 2000-11-21
Classification: H01L

Abstract:
Apparatus for treating a disk-shaped object, which comprises:a cap-shaped housing part and a holding plate which together define a processing chamber;said housing part including a first pipe for introducing a gaseous etching medium into said processing chamber;said holding plate having at least one indentation for supporting a disk-shaped object having a layer to be etched, and a second pipe for introducing a gaseous medium into said indentation; said gaseous medium being inert with respect to the layer to be etched;said indentation being circumscribed by an outer peripheral wall having an upper surface;said disk-shaped object having an outer peripheral lower surface adapted to engage the upper surface of the indentation, such that said indentation is smaller than the disk-shaped object; andwherein a nozzle-shaped ring gap is provided between a peripheral edge of the disk-shaped object and a surface area of the holding plate that surrounds the indentation.