Patent ID: 6977229

Claim:
A manufacturing method for semiconductor devices by use of a dry cleaning system having a vessel connected to a vacuum pump, a means for generating plasma, a gas supply means for supplying gas that is used for generating plasma, a wafer stage on which a wafer is to be set provided in said vessel, a planar pad provided with a gas hole for injecting gas toward the wafer and a flat part facing to the wafer, and a means for scanning said planar pad on said wafer, said manufacturing method comprises: a step for setting a wafer on said wafer stage, a step in which a flat gas that is used for generating plasma is supplied into said vessel by means of said gas supply means maintaining the internal of said vessel at a reduced pressure by use of said vacuum pump to thereby generate a first plasma in said vessel by means of said means for generating plasma; a step for cleaning the main surface of said wafer by applying the viscous friction force exerted due to gas flow of a third gas injected from said gas hole onto the main surface of said wafer that is brought close to the flat part of said planar pad and by applying action of electrons or radicals generated by said plasma together; a step in which a second plasma is generated using a second gas in said vessel after said cleaning step and the main surface of said wafer is exposed to said second plasma, said step including removing an element of said first gas adsorbed on the wafer surface or a film of a reaction product of said first gas deposited on the wafer surface; and a step for transferring said wafer to the outside of said vessel.