Patent ID: 7481886
Filing Date: 2009-01-27
Classification: C23C,H01J

Abstract:
1. A process system comprising: a chamber; a supply plate which has a plurality of gas holes and supplies a process gas into said chamber through said gas holes; a first diffusion portion which diffuses said gas in a direction approximately parallel to a major surface of said supply plate; and a second diffusion portion which leads said gas diffused by said first diffusion portion to said gas holes, said second diffusion portion comprised of a second disk, wherein said second diffusion portion is placed over said supply plate to form a hollow portion between said second disk and said supply plate such that said gas can be supplied from said first diffusion portion to said hollow portion; and said process system further comprising a partition member in said hollow portion which separates said hollow portion into a center area and an end area, and a gas supply portion comprising mutually independent gas flow passages, wherein a first gas flow passage passes through said first disk and said second disk via a plurality of grooves formed in one side of said second disk in fluid communication with each other and extending radially from approximately the center of the second disk, a first one of said grooves being in fluid communication with a through hole located in said first disk at an end portion of said first groove, and the remaining grooves having through holes formed therein, and supplies said gas via first through holes exclusively to said center area of the supply plate, and a second gas flow passage supplies said gas that is diffused by said first diffusion portion via second through holes and said second diffusion portion exclusively to said end area of the supply plate, wherein the gas flow rates in the mutually independent gas flow passages are independently controlled, a first gas flows from the center area of the hollow portion through the supply plate to a center area of the process chamber, and a second gas flows from the end area of the hollow portion through the supply plate to an end area of the process chamber such that the gases do not mix prior to entering the process chamber, and first and second gas flow passages are separate.