Substrate processing apparatus, substrate processing method, and storage medium

1. A substrate processing apparatus comprising:

a rotary holding part configured to hold and rotate a substrate with a film formed on an upper surface of the substrate;

a first supply part configured to supply a first chemical solution for etching the film to a peripheral edge portion of the upper surface of the substrate held by the rotary holding part;

a second supply part configured to supply the first chemical solution to a peripheral edge portion of a lower surface of the substrate; and

a third supply part configured to supply a second chemical solution, which exothermically reacts with the first chemical solution, to the peripheral edge portion of the lower surface of the substrate, such that the second chemical solution reaches a position closer to a rotational center of the substrate than a position where the first chemical solution supplied from the second supply part reaches the substrate.

2. The substrate processing apparatus of claim 1 , further comprising a controller configured to control:

the first supply part to supply the first chemical solution to the peripheral edge portion of the upper surface of the substrate;

the second supply part to supply the first chemical solution to the peripheral edge portion of the lower surface of the surface when the first chemical solution is supplied to the peripheral edge portion of the upper surface of the substrate; and

the third supply part to supply the second chemical solution to the peripheral edge portion of the lower surface of the substrate when the first chemical solution is supplied to the peripheral edge portion of the upper surface of the substrate and the peripheral edge portion of the lower surface of the substrate.

3. The substrate processing apparatus of claim 2 , wherein the controller further controls the second supply part and the third supply part so that a ratio of the first chemical solution and the second chemical solution, which reach the lower surface of the substrate, is adjusted according to a type of the film to be processed.

4. The substrate processing apparatus of claim 2 , wherein the controller further controls the first supply part, the second supply part, and the third supply part so that a mixed solution of the first chemical solution supplied from the second supply part and the second chemical solution supplied from the third supply part flows around the peripheral edge portion of the lower surface of the substrate to the peripheral edge portion of the upper surface of the substrate and collides with the first chemical solution supplied from the first supply part at the peripheral edge portion of the upper surface of the substrate.

5. The substrate processing apparatus of claim 3 , wherein the film is a multilayered film, and the controller is configured to change the ratio of the first chemical solution and the second chemical solution, which reach the lower surface of the substrate, according to which layer of the multilayered film is to be processed.

6. The substrate processing apparatus of claim 1 , wherein the film contains tungsten, the first chemical solution contains a hydrogen peroxide, and the second chemical solution contains a sulfuric acid.

7. A substrate processing method comprising:

holding and rotating a substrate with a film formed on an upper surface of the substrate,

supplying a first chemical solution for etching the film to a peripheral edge portion of the upper surface of the substrate; and

supplying the first chemical solution and a second chemical solution, which exothermically reacts with the first chemical solution, to a peripheral edge portion of a lower surface of the substrate when the first chemical solution is supplied to the peripheral edge portion of the upper surface of the substrate, such that the second chemical solution reaches a position closer to a rotational center of the substrate than a position where the first chemical solution supplied to the lower surface of the substrate reaches the substrate.

8. The substrate processing method of claim 7 , further comprising:

adjusting a ratio of the first chemical solution and the second chemical solution, which reach the lower surface of the substrate, according to a type of the film to be processed.

9. A non-transitory computer-readable storage medium storing a program for causing an apparatus to perform the substrate processing method of claim 7 .