Patent ID: 6849293

Claim:
A method for spin coating a polymeric material film upon a wafer rotatably mounted within a spin coater; the wafer having a surface, including the steps of: a first step of rotating the wafer on an axis perpendicular to the wafer surface while applying a predetermined amount of polymeric material while rotating the wafer at a rotational speed of from about 300 to 1200 rpm for from about 2.5 to 5 seconds to spread the polymeric material on the whole surface of the wafer; a second step of increasing the rotational speed of the wafer to about 5500 rpm for about 2.5 seconds; a third step of decreasing the rotational speed of the wafer to about 300 to 1200 rpm for about 2.5 seconds; and a fourth step of increasing the rotational speed of the wafer to about 5500 rpm for about 20 seconds to form the polymeric material film having a predetermined thickness over the whole surface of the wafer; wherein the wafer includes a series of openings that are partially filled with the polymeric material.