Patent ID: 7927657
Filing Date: 2011-04-19
Classification: B05C,B05D,H01L

Abstract:
1. A liquid processing method for forming a coating film on a polygonal substrate by spin coating in an ambient with a descending clean air flow, comprising the steps of: (a) supporting the polygonal substrate by a spin chuck and placing at least one air flow control member, which rotates with the spin chuck, along a periphery portion of the substrate except at corner portions thereof; (b) supplying a top surface of the substrate supported on the spin chuck with coating solution and centrifugally spreading the coating solution by rotating the spin chuck about a normal axle; (c) removing a part of the coating solution on the top surface of the substrate by rotating the substrate at a first rotating speed; and (d) evaporating solvent included in the remaining coating solution on the top surface of the substrate by rotating the substrate at a second rotating speed slower than the first rotating speed, wherein, when an area surrounded by a transfer arm is passed through the spin chuck transferring the substrate from the transfer arm to the spin chuck, the transfer arm is lowered relative to the spin chuck and support extrusions which support corner portions of the substrate are passed through cutout portions of the spin chuck and reach a region below the spin chuck, and wherein, at least in step (a), the corner portions of the substrate outwardly protrude from the spin chuck through the cutout portions of the spin chuck when the substrate is supported on the spin chuck.