Substrate processing method
A hydrophobizing agent is supplied to a substrate and a surface of the substrate is hydrophobized. Thereafter, the substrate is dried. The substrate to be processed is maintained in a state of not contacting water until it is dried after being hydrophobized. Collapse of a pattern formed on the substrate surface is thereby suppressed or prevented.
1. A substrate processing method for processing a substrate having a metal film formed thereon, the substrate processing method comprising:
a rinsing liquid supply step of supplying a rinsing liquid that contains water to the substrate;
a first solvent supply step of supplying a first solvent that does not contain a hydroxyl group to the substrate to replace a liquid held by the substrate by the first solvent after performing the rinsing liquid supply step; and
a hydrophobizing agent supply step of supplying a hydrophobizing agent, which contains a second solvent that does not contain a hydroxyl group and which hydrophobizes a metal, to the substrate to replace a liquid held by the substrate by the hydrophobizing agent after performing the first solvent supply step.
2. The substrate processing method according to claim 1 , further comprising: a water-soluble solvent supply step of supplying a water-soluble solvent, higher in solubility in water than the first solvent, to the substrate to replace a liquid held by the substrate by the water-soluble solvent after performing the rinsing liquid supply step and before performing the first solvent supply step.
3. The substrate processing method according to claim 1 , further comprising:
a drying step of removing a liquid from the substrate to dry the substrate after performing the hydrophobizing agent supply step; and
a non-contact state maintaining step of maintaining a state in which the substrate is not in contact with water from the end of the hydrophobizing agent supply step to the end of the drying step.
4. The substrate processing method according to claim 3 , wherein the non-contact state maintaining step includes a drying agent supply step of supplying a drying agent that does not contain water and is lower in boiling point than water to the substrate to replace a liquid held by the substrate by the drying agent after performing the hydrophobizing agent supply step and before performing the drying step.
5. The substrate processing method according to claim 1 , wherein the hydrophobizing agent supply step includes a step of mixing the second solvent and a stock solution of the hydrophobizing agent in a flow path of the hydrophobizing agent leading from a hydrophobizing agent tank, storing the stock solution of the hydrophobizing agent to be supplied to the substrate, to the substrate, and a step of supplying the mixed second solvent and stock solution of the hydrophobizing agent to the substrate.
6. The substrate processing method according to claim 1 , wherein the first solvent and the second solvent are the same type of solvent.
7. The substrate processing method according to claim 1 , wherein a recess portion having a bottomed cylindrical shape is formed on the substrate.
8. A substrate processing method comprising:
a first hydrophobizing step of supplying a first hydrophobizing agent to a substrate to hydrophobize a surface of the substrate;
a second hydrophobizing step of supplying a second hydrophobizing agent that differs from the first hydrophobizing agent to the substrate to hydrophobize the surface of the substrate after performing the first hydrophobizing step;
a drying step of drying the substrate after performing the second hydrophobizing step;
a water rinsing step of supplying a rinsing liquid that contains water to the substrate before the first hydrophobizing step is performed; and
a first solvent rinsing step of supplying a first solvent capable of dissolving the rinsing liquid and the first hydrophobizing agent to the substrate after performing the water rinsing step and before performing the first hydrophobizing step.
9. The substrate processing method according to claim 8 , wherein the first solvent does not contain water.
10. A substrate processing method comprising:
a first hydrophobizing step of supplying a first hydrophobizing agent to a substrate to hydrophobize a surface of the substrate;
a second hydrophobizing step of supplying a second hydrophobizing agent that differs from the first hydrophobizing agent to the substrate to hydrophobize the surface of the substrate after performing the first hydrophobizing step;
a drying step of drying the substrate after performing the second hydrophobizing step; and
a solvent rinsing step of supplying a solvent capable of dissolving the first hydrophobizing agent and the second hydrophobizing agent to the substrate after performing the first hydrophobizing step and before performing the second hydrophobizing step.
11. The substrate processing method according to claim 10 , wherein the solvent does not contain water.