Patent ID: 6991959
Filing Date: 2006-01-31
Classification: C23C,C30B,H01L

Abstract:
1. A method for forming a silicon carbide film on a semiconductor substrate by plasma CVD, comprising the steps of: (a) introducing a raw materials as containing silicon, carbon, and hydrogen and an inert gas at a predetermined mixture ratio of the raw material gas to the inert gas into a reaction chamber; (b) applying radio-frequency power to a reaction zone inside the reaction chamber at the mixture ratio, thereby forming on a semiconductor substrate a curable silicon carbide film having a dielectric constant of about 4.0 or higher; and (c) continuously applying radio-frequency power to the reaction zone at a mixture ratio which is reduced from that in step (b), thereby curing the silicon carbide film to give a dielectric constant lower than that of the curable silicon carbide film, wherein in step (a), in addition to the raw material gas and the inert gas, a hydrogen source gas is introduced into the reaction chamber, and wherein in step (c), the hydrogen source gas flow is changed by synchronizing the hydrogen source gas flow with the raw material gas flow.