Patent ID: 8083857
Filing Date: 2011-12-27
Classification: H01L

Abstract:
1. A substrate cleaning method comprising: a step of supplying a cleaning liquid into a cleaning tank and filling the cleaning tank with the cleaning liquid; a step of supplying a gas, by performing bubbling, into the cleaning tank, while an irradiation of ultrasonic waves to the cleaning liquid in the cleaning tank is being stopped, so as to increase a dissolved gas concentration of the gas dissolved in the cleaning liquid in the cleaning tank to a saturated concentration; a step of irradiating ultrasonic waves to the cleaning liquid in the cleaning tank so as to adjust the dissolved gas concentration of the cleaning liquid in the cleaning tank; a step of immersing the substrate into the cleaning liquid in the cleaning tank, and a step of irradiating ultrasonic waves to the cleaning liquid in the cleaning tank so as to clean a substrate immersed in the cleaning liquid in the cleaning tank, wherein the steps are performed in the above order.