Patent ID: 8652571
Filing Date: 2014-02-18
Classification: B05C,B05D,G03F,H01L

Abstract:
1. A spin coating method that supplies a coating liquid to a substrate and rotating the substrate to form a coating film, comprising: dispensing a first amount of coating liquid to a central part of the substrate while rotating the substrate about the central part of the substrate at a first number of revolutions and maintaining the rotation at the first number of revolutions during said dispensing; dispensing a second amount of coating liquid to the central part of the substrate while rotating the substrate at a second number of revolutions that is lower than the first number of revolutions after dispensing the first amount of coating liquid and maintaining the rotation at the second number of revolutions during said dispensing; rotating the substrate at a third number of revolutions for a reflow processing carried out after dispensing the second amount of coating liquid; and rotating the substrate at a fourth number of revolutions for determining the film thickness of the coating liquid after rotating the substrate at the third number of revolutions, wherein the first number of revolutions is a number of revolutions at which the first amount of coating liquid does not uniformly spread over the substrate and an edge of the first amount of the coating liquid is swollen because of air resistance, wherein the first number of revolutions is a number of revolutions such that the coating liquid cannot practically spread over the entire surface of the substrate even if an amount of coating liquid is enough to coat the entire surface of the substrate at a number of revolutions lower than the first number of revolutions, wherein the edge of the first amount of coating liquid that is swollen is pushed toward a peripheral part of the substrate during the dispensing of the second amount of coating liquid, thereby reducing the height of the edge that is swollen and moving the first amount of the coating liquid on the edge that is swollen to coat the peripheral part of the substrate, wherein the third number of revolutions is lower than the second number of revolutions, and wherein the fourth number of revolutions is higher than the third number of revolutions.