Patent ID: 11908680
Assignee: TOKYO ELECTRON LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A substrate processing method, comprising:
partially etching a metal polycrystalline film at a peripheral portion of a substrate in a thickness direction by supplying an etching liquid to the peripheral portion while rotating the substrate having the metal polycrystalline film formed on a front surface thereof,
washing away an etching residue generated in the partially etching of the metal polycrystalline film with a rinse liquid by supplying the rinse liquid to a portion of the substrate closer to a center side of the substrate than a supply position of the etching liquid in the partially etching of the metal polycrystalline film while rotating the substrate;
etching a remaining portion of the metal polycrystalline film at the peripheral portion of the substrate by supplying the etching liquid to the peripheral portion while rotating the substrate;
washing away an etching residue generated in the etching of the remaining portion of the metal polycrystalline film with the rinse liquid by supplying the rinse liquid to a portion of the substrate closer to the center side of the substrate than a supply position of the etching liquid in the etching of the remaining portion of the metal polycrystalline film while rotating the substrate;
drying the substrate after the washing away of the etching residue generated in the etching of the remaining portion of the metal polycrystalline film;
imaging the peripheral portion with an imaging device during the supplying of the etching liquid onto the substrate; and
determining whether or not the etching residue is generated at the peripheral portion based on a change in contrast of an image captured by the imaging device.