Patent ID: 8216389

Claim:
A substrate cleaning method for cleaning a surface of a substrate whose static contact angle with respect to water is 85 degrees or more, with the use of a first cleaning-liquid nozzle, a second cleaning-liquid nozzle, and a gas nozzle, which are integrally moved by a common drive mechanism via a nozzle holder, the substrate cleaning method comprising: a step in which the substrate is held horizontally by a substrate holder in such a manner that a central part of the substrate and a central part in rotation correspond to each other; a step in which, while the substrate holder is being rotated about a vertical axis, a cleaning liquid is discharged from the first cleaning-liquid nozzle to the central part of the substrate and is spread over all the surface of the substrate by a centrifugal force; a step in which, while the substrate holder is being continuously rotated, the nozzle holder is moved in such a manner that the cleaning liquid from the first cleaning-liquid nozzle is discharged to an eccentric position deviated from the central part of the substrate and that a gas is discharged from the gas nozzle to the central part of the substrate so as to form a dried area of the cleaning liquid under a condition in which a shortest distance between an edge of a cleaning liquid flow output from the cleaning-liquid nozzle and an edge of a gas flow output from the gas nozzle is set between 9 mm and 15 mm; a step in which, the nozzle holder is moved so as to move the first cleaning-liquid nozzle away from the central part of the substrate, and the cleaning liquid starts to be discharged from the second cleaning-liquid nozzle under a condition in which the gas is stopped to be discharged and a distance between the central part of the substrate and the to-be-discharged position of the cleaning liquid from the second cleaning-liquid nozzle is shorter than a distance between the central part of the substrate and a projection position of the gas nozzle onto the substrate; and a step in which, while the substrate holder is being continuously rotated, the to-be-discharged position of the cleaning liquid from the second cleaning-liquid nozzle is moved toward a periphery of the substrate at a speed lower than a speed at which the dried area is spread outward, with the cleaning liquid being discharged from the second cleaning-liquid nozzle.