Patent ID: 8454754
Filing Date: 2013-06-04
Classification: H01L

Abstract:
1. A cleaning method, comprising: producing an oxidizing solution by electrolysis of sulfuric acid, the oxidizing solution including sulfuric acid and oxidizing substances, and the sulfuric acid having a concentration of 90% by mass or more; generating heat of mixing by mixing the oxidizing solution with a hydrogen peroxide solution; and cleaning a workpiece with the oxidizing solution which is heated by heat of mixing and is supplied while rotating the workpiece and discharging the oxidizing solution from a movable nozzle to the rotating workpiece, the mixing the oxidizing solution and the hydrogen peroxide solution being performed at one of in a nozzle section having the movable nozzle and on the workpiece, and a mixing ratio of the oxidizing solution to the hydrogen peroxide solution being in the range of 1:1 to 1:5.