Patent ID: 9070731
Filing Date: 2015-06-30
Classification: B05C,F26B,G03F,H01L

Abstract:
1. A coating film forming method, comprising: horizontally holding a substrate with a substrate holding unit; positioning a ring-shaped member at a processing position where an air flow flowing above a peripheral edge portion of the substrate is straightened, the ring-shaped member annularly installed along a circumferential direction of the substrate so as to cover an upper side of the peripheral edge portion of the substrate; supplying a coating liquid to a central portion of the substrate; in a state in which the ring-shaped member is positioned at the processing position, rotating the substrate held in the substrate holding unit at a first revolution number by a rotating mechanism such that the coating liquid supplied to the central portion of the substrate is diffused toward the peripheral edge portion of the substrate by a centrifugal force; bringing the ring-shaped member to a retreated position by moving the ring-shaped member upward from the processing position with respect to the substrate by an elevator mechanism, the retreated position being a position where an air flow flowing near a front surface of the substrate is prevented from becoming turbulent due to a change in the revolution number of the substrate; and reducing the revolution number of the substrate to a second revolution number lower than the first revolution number, wherein the method further comprising: in parallel with supplying the coating liquid to the substrate, rotating the substrate at a coating liquid supply revolution number; and then in parallel with stopping the supply of the coating liquid to the substrate, rotating the substrate at a liquid pool formation revolution number, the liquid pool formation revolution number being lower than the coating liquid supply revolution number, wherein rotating the substrate at a first revolution number is performed after rotating the substrate at a liquid pool formation revolution number; wherein the method further comprising: in parallel with rotating the substrate at a first revolution number, evacuating the inside of a cup, which surrounds the substrate held in the substrate holding unit, at an exhaust flow rate associated with the first revolution number, wherein the first revolution number is changeable in a processing of a next substrate.