Patent ID: 8334222

Claim:
A processing method of a semiconductor wafer comprising the steps of: setting the semiconductor wafer horizontally; removing at least part of an oxide film from a surface of the semiconductor wafer by applying hydrogen fluoride gas to the semiconductor wafer while the semiconductor wafer is rotated such that the surface becomes water repellant such that a contact angle of water becomes at least 32 degrees, the hydrogen fluoride gas made by bubbling nitrogen gas into aqueous hydrofluoric acid and collecting a gas phase from the bubbled aqueous hydrofluoric acid; removing a portion of water from the surface by stopping application of the hydrogen fluoride gas while the semiconductor wafer is continuously rotated at less than 500 rpm; and forming at least a partial oxide film on the surface by applying oxidizing gas such that the surface becomes so hydrophilic that a contact angle of water becomes not exceeding 12 degrees wherein a gas flow of the oxidizing gas is characterized by an unsaturated vapor pressure such that remaining water on the surface of the semiconductor wafer vaporizes, wherein the above steps are conducted in this order and the step of forming at least said partial oxide film is a final step of the processing method.