Patent ID: 7615117
Filing Date: 2009-11-10
Classification: B05D,G03F,H01L

Abstract:
1. A spin coating apparatus for applying a coating solution to a quadrangular substrate for a light exposure step in a photolithographic process and for removing the coated solution adhering to back and side surfaces of the quadrangular substrate by use of a rinse liquid, the device comprising: a spin chuck comprising a holding plate facing the back surface of the quadrangular substrate and also comprising substrate supporting members provided on the holding plate for supporting the peripheral portion of the quadrangular substrate with a clearance between the substrate and the holding plate, and horizontally holding the quadrangular substrate and rotating the quadrangular substrate in a horizontal plane; a coating solution nozzle for supplying a coating solution to a front surface of the quadrangular substrate horizontally held by the spin chuck; a rinse liquid supply mechanism comprising a plurality of nozzles supplying the rinse liquid to a lower surface of the holding plate while rotating and also comprising guide channels for guiding the rinse liquid to a clearance between the back surface of the quadrangular substrate and the holding plate with the help of centrifugal force; and a wall provided along a periphery of the holding plate except corner portions of the quadrangular substrate to face side surfaces of the substrate, wherein the rinse liquid supplied to the back surface of the surface is allowed to reach the back surface and side surface of each of corner portions of the quadrangular substrate by a centrifugal force produced by rotation of the spin chuck, thereby removing the coating solution attached.