Patent ID: 6436851
Filing Date: 2002-08-20
Classification: B05D,H01L

Abstract:
A method for spin coating a high viscosity liquid on a wafer surface comprising the steps of:providing a liquid having a viscosity of at least 1000 cp; rotating a wafer having a top surface to be coated in a first rotating step to a speed of less than 300 rpm while simultaneously dispensing in a first step said liquid onto said top surface of the wafer forming a cup-shaped pattern at a center portion of said wafer; stopping the rotation of said wafer; dispensing in a second step said liquid onto said top surface of the wafer to sufficiently fill up a cavity in said cup-shaped pattern; and rotating said wafer in a second rotating step to a speed of at least 3000 rpm such that said liquid in said cup-shaped pattern spreads out to substantially cover an entire top surface of said wafer.