Patent ID: 6136718
Filing Date: 2000-10-24
Classification: H01L

Abstract:
A method for manufacturing a semiconductor wafer, the method comprising the steps of:depositing a metallic layer onto the semiconductor wafer;placing the semiconductor wafer into a processing chamber;passing a metal etch process gas comprising chlorine atoms through a gas fitting, the gas fitting comprising:a gas inlet portion coupled to receive the metal etch process gas as an input to the gas fitting;a base fitting coupled to the gas inlet portion;a threadless gas outlet coupled to the base fitting, the threadless gas outlet having a first end having a first opening coupled to the base fitting and a second end having a second opening for providing a process gas as an output; andwherein portions of the gas fitting are made of a corrosion-resistant material that is substantially resistive to corrosion when exposed to the metal etch process gas;passing the metal etch process gas from the threadless gas outlet of the gas fitting into a gas ring, the gas ring being mechanically fastened to the gas fitting at least two separated points, the gas ring comprising:a gas feed inlet opening in which is positioned the threadless gas outlet;a gas channel coupled to the gas feed inlet wherein the second opening of the threadless gas outlet lies at least partially within the gas channel;at least one opening in the gas channel to provide the process gas to a process chamber containing the semiconductor wafer; andwherein a portion of the gas ring is made of material that is more corrosive in a presence of the process gas than the corrosion-resistant material of the gas fitting, the gas fitting protecting a portion of the gas ring from corrosion when the gas ring is in the presence of the process gas;etching at least a portion of the metallic layer from the semiconductor wafer within the process chamber using the process gas; andremoving the semiconductor wafer from the processing chamber.