Patent ID: 6758908
Filing Date: 2004-07-06
Classification: G03F,H01L

Abstract:
An apparatus, comprising:a rotatable wafer-holding mechanism to hold a wafer having a front surface, a back surface and a side; a solvent dispense head in fluid communication with a source of a photo resist solution and in fluid communication with a solvent source containing a solvent that includes diacetone alcohol and aliphatic ester, wherein the solvent head includes: a first nozzle directed at the side of the wafer; a second nozzle directed at the back surface of the wafer; and a third nozzle directed at a center of the front surface of the wafer; and a logic control unit including coding corresponding to a process to coat a wafer, the logic control unit to execute the coding to perform the process, wherein the process comprises: dispensing the solvent from the third nozzle to prewet the front surface of the wafer; actuating the rotatable wafer-holding mechanism to spin the wafer until the solvent is distributed across the front surface of the wafer; upon distributing the solvent, dispensing the photo resist solution on the wafer; actuating the rotatable wafer-holding mechanism to spin the wafer until the photo resist solution is distributed; and upon distributing the photo resist material, dispensing the solvent from the first nozzle to remove an edge bead and dispensing the solvent from the second nozzle to clean the back surface of the wafer.