Patent ID: 8277889

Claim:
A film formation method for depositing a metal film on a target substrate by supplying a metal carbonyl source in a gas phase to a surface of the target substrate disposed on a substrate holder and decomposing the source before the metal carbonyl source arrives at the surface of the target substrate, the target substrate having an outer circumferential peripheral portion radially separated from an inner portion, the method comprising: a step of preferentially decomposing the metal carbonyl source at a greater rate in an area of an outer circumferential peripheral portion of the target substrate than in the inner portion of the target substrate by setting a temperature zone contiguously surrounding the outer circumferential peripheral portion of the substrate at a higher temperature than the substrate holder; and depositing the metal film on the surface of the target substrate; wherein a CO concentration is increased locally in an atmosphere near the outer circumferential peripheral portion of the target substrate relative to the inner portion of the target substrate, and the depositing of the metal film on the outer peripheral portion is better controlled.