Patent ID: 7651730
Filing Date: 2010-01-26
Classification: C03C,C23C,H01L

Abstract:
1. A method for forming a silicon oxide film on a metal surface present on a target substrate by CVD, in a process field configured to be selectively supplied with an Si-containing gas, an oxidizing gas, and a deoxidizing gas, the method alternately comprising: a first step of performing supply of the Si-containing gas to the process field without performing supply of the oxidizing gas and the deoxidizing gas to the process field; a second step of maintaining shutoff of supply of the Si-containing gas, the oxidizing gas, and the deoxidizing gas to the process field; a third step of performing supply of the oxidizing gas and the deoxidizing gas to the process field at the same time, without performing supply of the Si-containing gas to the process field; and a fourth step of maintaining shutoff of supply of the Si-containing gas, the oxidizing gas, and the deoxidizing gas to the process field, wherein the method is arranged to form a deoxidizing gas rich state by setting a ratio of the flow rate of the oxidizing gas relative to the flow rate of the deoxidizing gas to be within a range of 1/10 to 1/500 in the third step, to start supply of the deoxidizing gas before starting supply of the oxidizing gas, to maintain supply of the deoxidizing gas while supplying the oxidizing gas, and to stop supply of the deoxidizing gas after stopping supply of the oxidizing gas so as to provide the third step with additional periods of performing supply of the deoxidizing gas to the process field without performing supply of the Si-containing gas and the oxidizing gas to the process field before and after the third step, and to repeat the first to fourth steps a plurality of times, thereby depositing a silicon oxide film on the metal surface.