Patent ID: 6283130
Filing Date: 2001-09-04
Classification: C23C,H01J,H01L,Y10T

Abstract:
A plasma cleaning method comprising the steps of:placing a plate-shaped placement area protector on a substrate stage over an area corresponding to an area for a substrate placement during film formation to protect the area, said placement area protector being made of a dielectric material and having surface dimensions and a shape matching one of: (a) surface dimensions and a shape of a substrate to be processed during film formation and (b) an area for substrate placement on a surface of the substrate stage;introducing an etching gas into a vacuum vessel by a gas introduction mechanism;applying a first high-frequency electromagnetic wave to a conductor surrounding the vacuum vessel using a first high-frequency electromagnetic wave supply to form plasma in the vacuum vessel;applying a second high-frequency electromagnetic wave to the substrate stage using a second high-frequency electromagnetic wave supply to supplementarily form plasma in the proximity of the surface of the substrate stage, wherein a frequency of said first high frequency electromagnetic wave and a frequency of said second high-frequency electromagnetic wave are equal.