Patent ID: 9570326
Date: 2017-02-14
CPC Classifications: B08B,G01B,G03F,H01L

Claim:
1. A substrate cleaning method comprising: a first step in which, while a substrate is rotated, a cleaning liquid is ejected from a liquid nozzle positioned above the substrate, to a central portion of a surface of the substrate; a second step in which, after the first step, a dry gas is ejected from a gas nozzle positioned above the substrate, to the central portion of the surface of the substrate, so as to form a dry area on the central portion of the surface of the substrate; a third step in which, after the second step, the cleaning liquid is ejected from the liquid nozzle to the surface of the substrate, while the substrate is rotated and the liquid nozzle is moved from a central side of the substrate toward a peripheral side thereof; a fourth step in which a width of an intermediate area generated between a wet area, which spreads outward from a supply position of the cleaning liquid on the surface of the substrate, and the dry area is acquired; and a fifth step in which, when the width of the intermediate area exceeds a predetermined threshold value, a process parameter used for processing the substrate is changed such that the width of the intermediate area becomes the threshold value or less.