Patent ID: 7229522

Claim:
A substrate processing apparatus comprising: a processing vessel adapted to accommodate a substrate therein to process the substrate with a mixed gaseous fluid containing water vapor and ozone-containing gas supplied into the processing vessel; an ozone generator adapted to generate an ozone-containing gas to be supplied into the processing vessel, by applying electric discharge to oxygen gas; a component member of said processing apparatus placed in the processing vessel; a heater adapted to heat an interior of the processing vessel; and a controller configured to control the heater to maintain the interior of the processing vessel at a temperature in a range of 80°C. to 120°C. when the substrate is being processed in the processing vessel by using the water vapor and the ozone-containing gas, wherein an inner surface, to be exposed to the mixed gaseous fluid, of the processing vessel or a surface, to be exposed to the mixed gaseous fluid, of the component member is coated with a SiO 2 film, with the SiO 2 film having a thickness in a range of 0.5 to 1.5 μm, wherein said apparatus does not include means for generating a plasma in the processing vessel, and the substrate processing apparatus, wherein the SiO 2 film comprises at least one baked-on layer produced by applying a Si-containing raw material on the surface to be coated with the SiO 2 film, and by baking the Si-containing raw material, and wherein the Si-containing raw material comprises an organic Si compound, or a solution containing a solvent and an organic Si compound dissolved in the solution, and wherein the SiO 2 film comprises a plurality of baked-on layers.