Patent ID: 9704730
Date: 2017-07-11
CPC Classifications: H01L

Claim:
1. A substrate cleaning method of cleaning a substrate using a cleaning liquid and a gas while rotating the substrate, comprising the steps of: horizontally holding the substrate on a substrate holding unit; discharging the cleaning liquid from a first cleaning liquid nozzle to a central portion of the substrate while rotating the substrate holding unit around a vertical axis; then moving a discharge position of the cleaning liquid to a peripheral edge side of the substrate and thereafter discharging the gas from a gas nozzle to the central portion of the substrate; subsequently moving discharge positions of the first cleaning liquid nozzle and the gas nozzle toward the peripheral edge side of the substrate while discharging the cleaning liquid and the gas from the first cleaning liquid nozzle and the gas nozzle respectively; and then switching discharge of the cleaning liquid from the first cleaning liquid nozzle to a second cleaning liquid nozzle, and moving discharge positions of the second cleaning liquid nozzle and the gas nozzle toward the peripheral edge side of the substrate while discharging the cleaning liquid from the second cleaning liquid nozzle and discharging the gas from the gas nozzle, wherein the discharge position of the second cleaning liquid nozzle is set at a position deviated from a movement locus of the discharge position of the first cleaning liquid nozzle, and wherein where a distance from the discharge position of the second cleaning liquid nozzle to the central portion of the substrate is d2, and a distance from the discharge position of the gas nozzle to the central portion of the substrate is d3, when the cleaning liquid is being discharged from the second cleaning liquid nozzle, d3<d2 and a difference between d2 and d3 gradually decreases with movement of the second cleaning liquid nozzle to the peripheral edge side of the substrate.