Patent ID: 8734901
Filing Date: 2014-05-27
Classification: C23C,H01L

Abstract:
1. A film deposition method of depositing a silicon nitride thin film by alternately supplying at least a first source gas and a second source gas to a substrate thereby allowing the first and the second source gases to react with each other on the substrate, the film deposition method comprising steps of: evacuating a process chamber where the substrate is accommodated, without supplying any gas to the process chamber; supplying an inert gas to the process chamber until a pressure within the process chamber becomes a predetermined pressure; supplying the first source gas to the process chamber at the predetermined pressure without evacuating the process chamber after supplying the inert gas to the process chamber; stopping supplying the first source gas to the process chamber and evacuating the process chamber; supplying the second source gas to the process chamber; and stopping supplying the second source gas to the process chamber and evacuating the process chamber, wherein the method further comprises adjusting the pressure within the process chamber in a range approximately between 0.08 Torr and 0.5 Torr before supplying the second source gas to the process chamber so that a thickness distribution of the silicon nitride thin film has a concave pattern where a thickness of the thin film becomes greater from a center area toward a circumferential area of the substrate, and increasing the pressure from approximately 0.5 Torr so that the thickness distribution of the thin film has a convex pattern where the thickness of the silicon nitride thin film becomes smaller from the center area toward the circumferential area of the substrate.