Patent ID: 9555452
Date: 2017-01-31
CPC Classifications: B08B,H01L

Claim:
1. A substrate treatment method comprising: a liquid film retaining step of retaining a liquid film of a treatment liquid on an upper surface of a substrate; a locating step of locating a heater having a smaller diameter than the upper surface of the substrate in opposed relation to the upper surface of the substrate; a first heater heating step of setting an output of the heater at a first non-zero output level to heat the treatment liquid film on the upper surface of the substrate; a heater moving step of moving the heater along the upper surface of the substrate in the first heater heating step; and a second heater heating step of changing the output of the heater to a second non-zero output level which is lower than the first output level to heat the treatment liquid film on the upper surface of the substrate after the first heater heating step; wherein the heater is stationary in the second heater heating step; and wherein the heater moving step includes a step of moving the heater from an edge position in which the heater is opposed to a peripheral edge portion of the upper surface of the substrate, to a middle position in which the heater is not opposed to either the peripheral edge portion or a center portion of the upper surface of the substrate, but is opposed only to a portion which is intermediate between the center portion of the upper surface of the substrate and the peripheral edge portion of the upper surface of the substrate.