Substrate processing method and substrate processing device

1. A substrate processing method for removing a resist having a hardened layer from a substrate on a surface of which the resist is formed, including:

a substrate holding step of holding the substrate; and

a resist stripping step of stripping the resist from the surface of the substrate, without using a processing liquid containing sulfuric acid, by supplying ozone gas and superheated steam to a plural-fluid nozzle to mix the ozone gas and the superheated steam at the plural-fluid nozzle so as to discharge mixed gas of ozone gas and superheated steam from the plural-fluid nozzle toward the surface of the substrate, the mixed gas containing liquid drops of ozone water produced by mixing the ozone gas and the superheated steam to cause mutual contact thereof at the plural-fluid nozzle.

2. A substrate processing method according to claim 1 , wherein ozone gas supplied to the plural-fluid nozzle is at room temperature.

3. A substrate processing method according to claim 1 , further including a resist residue removing step of removing resist residue from the surface of the substrate by supplying a processing liquid to the plural-fluid nozzle to discharge the processing liquid from the plural-fluid nozzle toward the surface of the substrate from which the resist has been stripped.

4. A substrate processing method according to claim 3 , the resist residue removing step further includes a processing liquid drop discharging step of discharging liquid drops of the processing liquid toward the surface of the substrate by supplying the processing liquid and superheated steam to the plural-fluid nozzle.

5. A substrate processing method according to claim 3 , wherein the processing liquid includes a chemical liquid that has a chemical constitution that is effective to react with and to remove the resist residue from the surface of the substrate.

6. A substrate processing method according to claim 1 , wherein the plural-fluid nozzle has a first port and a second port separated from the first port, and including the step of supplying the ozone gas and the superheated steam to the first port and the second port, respectively, so that the mixing of the ozone gas and the superheated steam occurs at the plural-fluid nozzle.

7. A substrate processing method according to claim 1 , including supplying the ozone gas to the plural-fluid nozzle at a temperature below a boiling point of water, and the liquid droplets of ozone water being produced by cooling the superheated steam with the ozone gas.

8. A substrate processing method according to claim 7 , including producing the liquid droplets of ozone water by condensing the superheated steam.