Patent ID: 11890652
Assignee: EBARA CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  H | IPC B

Claim 0:
1. A cleaning chemical liquid supply method for supplying a chemical liquid for cleaning a substrate to a cleaning device, the cleaning chemical liquid supply method comprising:
a process of controlling flow rates of a first chemical liquid and dilution water while supplying the first chemical liquid and the dilution water to a first mixer;
a process of supplying the first chemical liquid after dilution to a first position of the substrate from the first mixer through a first nozzle;
a process of controlling flow rates of the first chemical liquid and the dilution water while supplying the first chemical liquid and the dilution water to a second mixer;
a process of supplying the first chemical liquid after dilution to a second position, differing from the first position, of the substrate from the second mixer through a second nozzle;
a process of controlling flow rates of a second chemical liquid and the dilution water while supplying the second chemical liquid and the dilution water to a third mixer;
a process of supplying the second chemical liquid after dilution to a third position of the substrate from the third mixer through a third nozzle;
a process of controlling flow rates of the second chemical liquid and the dilution water while supplying the second chemical liquid and the dilution water to a fourth mixer; and
a process of supplying the second chemical liquid after dilution to a fourth position, differing from the third position, of the substrate from the fourth mixer through a fourth nozzle,
wherein one of the first chemical liquid and the second chemical liquid is an alkaline chemical liquid, and the other is an acid chemical liquid,
wherein the first position of the substrate is on an upper surface of the substrate,
the second position of the substrate is on a lower surface of the substrate,
the third position of the substrate is on the upper surface of the substrate,
the fourth position of the substrate is on the lower surface of the substrate, and
wherein a concentration of the first chemical liquid supplied to the first position of the substrate from the first mixer is higher than a concentration of the first chemical liquid supplied to the second position of the substrate from the second mixer, and a flow rate of the first chemical liquid supplied to the first position of the substrate from the first mixer is higher than a flow rate of the first chemical liquid supplied to the second position of the substrate from the second mixer; and
a concentration of the second chemical liquid supplied to the third position of the substrate from the third mixer is higher than a concentration of the second chemical liquid supplied to the fourth position of the substrate from the fourth mixer, and a flow rate of the second chemical liquid supplied to the third position of the substrate from the third mixer is higher than a flow rate of the second chemical liquid supplied to the fourth position of the substrate from the fourth mixer, wherein the first, second, third and fourth positions are disposed in a same cleaning tank.