Patent ID: 7879399
Filing Date: 2011-02-01
Classification: C23C

Abstract:
1. A CVD method for forming a metal film on a substrate to be processed by using a metal carbonyl gas, the method comprising: a preparing step for setting an inner pressure of a vacuum chamber accommodating the substrate therein at a vacuum pressure and, heating the substrate inside the vacuum chamber to a first temperature where the metal carbonyl gas is decomposed; a supplying step for supplying the metal carbonyl gas composed of a metal carbonyl and a carrier gas into the vacuum chamber while exhausting the inside of the vacuum chamber with a first vacuum pumping speed, in a state where the substrate is substantially heated to the first temperature; a removing step for removing, after the supplying step, a decomposed gas produced by a decomposition of the metal carbonyl gas, by stopping supplying the metal carbonyl gas and purging the inside of the vacuum chamber by supplying a purge gas thereto while exhausting the inside of the vacuum chamber with a second vacuum pumping speed, wherein in the removing step, the inside of the vacuum chamber is exhausted such that the inner pressure of the vacuum chamber remains identical to the inner pressure of the vacuum chamber in the supplying step; and a repeating step for carrying out the supplying step and the removing step repeatedly, wherein the carrier gas and the purge gas are inert gases.