Apparatus for stripping photoresist and method thereof

1. An apparatus for removing a photoresist from a substrate comprising:

a conveying unit conveying the substrate;

a stripping bath chamber;

a stripper dispensing unit positioned to dispense a photoresist stripper material to the substrate while the substrate is disposed in the stripping bath chamber;

a first antifoaming agent dispensing unit operatively associated with the stripping bath chamber, the first antifoaming agent dispensing unit configured to dispense an antifoaming agent toward the photoresist stripper material in the stripping bath chamber;

an antifoaming agent storing unit communicating with the first antifoaming agent supplying unit, the antifoaming agent storing unit configured to store the antifoaming agent;

a stripper storing unit operatively connected to the stripper dispensing unit, the stripper storing unit configured to store the photoresist stripper material and configured to supply the stored photoresist stripper material to the stripper dispensing unit; and

a second antifoaming agent dispensing unit operatively associated with the stripper storing unit, the second antifoaming agent dispensing unit configured to dispense an antifoaming agent to the photoresist stripper material stored within the stripper storing unit;

a stripper drain pipe that connects directly between the stripper storing unit and the stripping bath chamber to drain the photoresist stripper material from the stripping bath chamber to the stripper storing unit;

a stripper supplying pipe that connects directly between the stripper dispensing unit and the stripper storing unit to supply the photoresist stripper material from the stripper storing unit to the stripper dispensing unit;

a first antifoaming agent supplying pipe that connects directly between the antifoaming agent storing unit and the antifoaming agent dispensing unit to supply the antifoaming agent from the antifoaming agent storing unit to the first antifoaming agent dispensing unit; and

a second antifoaming agent supplying pipe that connects directly between the antifoaming agent storing unit and the second antifoaming agent dispensing unit to supply the antifoaming agent from the antifoaming agent storing unit to the second antifoaming agent dispensing unit,

wherein the antifoaming agent storing unit is configured to supply the antifoaming agent to the first and second antifoaming agent dispensing units, and

wherein a quantity of the antifoaming agent is no more than 5% of a quantity of the photoresist stripper material.

2. The apparatus of claim 1 , wherein each of the first and second antifoaming agent dispensing units, and the stripper dispensing unit has at least one nozzle.

3. The apparatus of claim 1 ,

wherein the first antifoaming agent dispensing unit comprises a plurality of antifoaming agent dispensing nozzles, and

wherein the first antifoaming agent dispensing is disposed entirely within the stripping bath chamber.

4. The apparatus of claim 1 , wherein the stripper storing unit is a first stripper storing unit, the apparatus further comprising:

a second stripper storing unit operatively connected to the stripper dispensing unit and to the stripping bath chamber,

wherein the second stripper storing unit is configured to store the photoresist stripper material drained from the stripping bath chamber and configured to supply the stored photoresist stripper material to the stripper dispensing unit.

5. The apparatus of claim 4 , further comprising:

a third antifoaming agent dispensing unit operatively connected to the antifoaming agent storing unit,

wherein the third antifoaming agent dispensing unit is configured to dispense the antifoaming agent from antifoaming agent storing unit to the photoresist stripping material stored in the second stripper storing unit.

6. The apparatus of claim 1 , wherein the first antifoaming agent dispensing unit is configured to dispense additional antifoaming agent to the photoresist stripper material in the stripping bath chamber that has been dispensed by the stripper dispensing unit.

7. The apparatus of claim 1 , wherein the first antifoaming agent dispensing unit is configured to dispense additional antifoaming agent to a recycled photoresist stripper material from the stripper storing unit dispensed by the stripper dispensing unit.

8. The apparatus of claim 1 , wherein the second antifoaming agent dispensing unit is configured to dispense additional antifoaming agent to the photoresist stripper material in the stripper storing unit that has been drained from the stripping bath chamber.

9. The apparatus of claim 1 , wherein the antifoaming agent dispensing unit is configured to dispense additional antifoaming agent to the photoresist stripper material in the stripper storing unit prior to being recycled by the stripper dispensing unit.

10. A method for removing a photoresist from a substrate, comprising;

providing a stripping bath chamber;

conveying a substrate containing a photoresist through the stripping bath chamber;

applying a photoresist stripper material to the substrate containing the photoresist; and

applying a first antifoaming agent to the photoresist stripper material in the stripping bath chamber to eliminate the foam produced therein, wherein a quantity of the antifoaming agent is no more than 5% of a quantity of the photoresist stripper material;

draining the photoresist stripper material collected in the stripping bath chamber after use in a stripping process to a stripper storing unit for reuse; and

applying a second antifoaming agent directly to the photoresist stripper material stored in the stripper storing unit to remove the foam remaining in the photoresist stripper material stored in the stripper storing unit.

11. The method of claim 10 , wherein the photoresist stripper material is an inorganic based material.

12. The method of claim 11 , wherein the inorganic based material is selected from the group consisting of KOH and NaOH.

13. The method of claim 10 , further comprising supplying the photoresist stripper material from the stripper storing unit to be dispensed to the substrate being conveyed through the stripping bath chamber.

14. The apparatus of claim 10 , wherein the antifoaming agent includes alcohol groups.

15. The method of claim 10 , wherein the antifoaming agent is isopropyl alcohol.

16. The method of claim 10 , wherein the antifoaming agent is one of methanol, ethanol, and propanol.

17. The method of claim 10 , wherein the stripper storing unit is a first storing unit, the method further comprising:

determining whether the photoresist stripper material in the first stripper storing unit is unable to be reused;

draining the photoresist stripper material collected in the stripping bath chamber after use in the stripping process to a second stripper storing unit for reuse when it is determined that the photoresist stripper material in the first stripper storing unit is unable to be reused; and

applying the antifoaming agent to the photoresist stripper material to remove the foam remaining in the photoresist stripper material stored in the second stripper storing unit.

18. The method of claim 17 , the method further comprising:

draining the photoresist stripper material from the first stripper storing unit when it is determined that the photoresist stripper material in the first stripper storing unit is unable to be reused.

19. The method of claim 10 , wherein the step of applying the first antifoaming agent to the photoresist stripper material includes applying additional antifoaming agent to the photoresist stripper material in the stripping bath chamber that has been used in the step of applying the photoresist stripper material to the substrate containing the photoresist.