Patent ID: 6652658
Filing Date: 2003-11-25
Classification: C25D,C25F,H01L,Y10S

Abstract:
A method for processing with hydroxide ions in ultra-pure water, comprising the steps of:disposing a workpiece and a high pressure nozzle a specific distance apart from each other inside a washing tank containing only ultra-pure water; providing an ion exchange material or catalyst material that increases the amount of hydroxide ions between the processing surface of said workpiece and the distal end of the high pressure nozzle facing said surface; applying a voltage using the high pressure nozzle as the cathode and the workpiece as the anode; generating a high-speed shear flow of ultra-pure water sprayed from the high pressure nozzle near the surface of the workpiece; supplying hydroxide ions produced from the ultra-pure water to the workpiece surface; and subjecting the workpiece to removal processing or to oxide film formation processing by means of a chemical elution reaction or oxidation reaction brought about by the hydroxide ions.