Patent ID: 7699939
Filing Date: 2010-04-20
Classification: H01L

Abstract:
1. A substrate cleaning method that comprises rotating a substrate at least for a period, performing liquid cleaning on a front surface of the substrate, and drying the substrate, wherein said performing liquid cleaning on the front surface of the substrate comprises supplying a treating liquid with a liquid supply position set at a central portion of the substrate while rotating the substrate at a reference rotational speed, and said drying the substrate comprises: then, supplying the treating liquid with the liquid supply position kept at the central portion of the substrate and, at a first time point, starting a speed-reducing operation of reducing a rotational speed of the substrate from the reference rotational speed; then, from the first time point, continuing the speed-reducing operation along with supply of the treating liquid and, at a second time point thereafter when the rotational speed of the substrate thereby reaches a first rotational speed lower than the reference rotational speed, starting a scanning operation of moving the liquid supply position from the central portion of the substrate towards a peripheral portion thereof while supplying the treating liquid; then, from the second time point, further continuing the speed-reducing operation along with supply of the treating liquid and the scanning operation, and, at a third time point thereafter when the rotational speed of the substrate thereby reaches a second rotational speed lower than the first rotational speed, stopping supply of the treating liquid and ending the speed-reducing operation; then, increasing the rotational speed of the substrate from the second rotational speed with supply of the treating liquid kept stopped from the third time point; and supplying a gas to the substrate while rotating the substrate at a higher rotational speed than the second rotational speed with supply of the treating liquid kept stopped from the third time point.