Patent ID: 8232217

Claim:
A method of manufacturing a semiconductor device, the method using a film deposition apparatus including a reaction chamber, a buffer chamber provided in the reaction chamber, a first gas supply section supplying a first reactant gas and a second reactant gas different from the first reactant gas into the buffer chamber, a second gas supply section supplying a third reactant gas into the reaction chamber, and a plasma generator generating plasma in the buffer chamber, wherein the method comprises: supplying the first reactant gas and the second reactant gas into the buffer chamber through the first gas supply section to form a first film over an inner wall surface of the buffer chamber; after forming the first film, setting a semiconductor wafer into the reaction chamber; and after setting the semiconductor wafer into the reaction chamber, supplying the first reactant gas into the buffer chamber through the first gas supplying section and supplying the third reactant gas into the reaction chamber through the second gas supplying section, thereby to form a second film over the semiconductor substrate.