Patent ID: 8091504
Filing Date: 2012-01-10
Classification: B05D,H01L

Abstract:
1. A spin coater apparatus comprising: a coater cup having a basin with sidewalls and a drain pipe at the bottom of the basin; a rotatable platform situated inside the cup adapted for holding and rotating a wafer to be coated, wherein the entire bottom surface of the wafer contacts a top surface of the rotatable platform; a liquid dispenser situated over the rotatable platform for dispensing a liquid coating material on top of the wafer; motor means for rotating the rotatable platform at a predetermined rotational speed; and solvent dispensing means mounted under the rotatable platform and extending from the bottom of the basin of the cup with at least a nozzle spray aimed toward edge and backside of the wafer for dispensing a cleaning solvent to pre-wet an interior surface of the sidewalls to dissolve and rinse off any liquid coating material splattered thereon and to prevent the formation of solid contaminating particles from the splattered liquid coating material, wherein the nozzle spray and the drain pipe are so arranged that substantially the entire interior surface of the sidewalls and the bottom of the basin of the coater cup from which the solvent dispensing means extends are pre-wetted by the cleaning solvent.