Patent ID: 8992691
Filing Date: 2015-03-31
Classification: G01N,H01L

Abstract:
1. A method of implementing cleaning solution replacement in a recyclable fluid cleaning system for semiconductor wafers, the method comprising: activating electrode current through electrodes of an electrolysis reactor included in the cleaning system; analyzing an electrode voltage of the electrodes of the electrolysis reactor as a function of time until a trigger point has been reached, wherein the trigger point comprises the electrode voltage of the electrodes of the electrolysis reactor being at a predetermined threshold voltage value corresponding to a surface condition, the surface condition corresponding to resist residue coating the electrodes, of the electrodes for a time period that is at least a predetermined amount of time; and upon reaching the trigger point, deactivating the electrode current, draining at least a portion of cleaning system fluid within the cleaning system, and replacing the drained cleaning system fluid with fresh cleaning fluid.