Patent ID: 8349403

Claim:
A vapor-phase process method, comprising the steps of: setting a process object in a process chamber; and processing said process object by supplying a reaction gas into said process chamber, wherein in said processing step, a gas is supplied at a different flow rate from each of one gas introduction portion and another gas introduction portion different from said one gas introduction portion among a plurality of gas introduction portions formed in a wall surface of said process chamber along a direction of flow of said reaction gas, wherein a plurality of said gas introduction portions are formed in the wall surface of said process chamber also in a direction of width intersecting the direction of flow of said reaction gas, and in said processing step, said gas is supplied at a different flow rate from each of one gas introduction portion and an additional gas introduction portion formed at a position different from that of said one gas introduction portion in said direction of width among the plurality of gas introduction portions formed in said wall surface in said direction of width, and wherein in said processing step, said process object is carried on a susceptor, said plurality of gas introduction portions include said one gas introduction portion, said another gas introduction portion, and yet another gas introduction portion formed along the direction of flow of said reaction gas, a first boundary portion between said one gas introduction portion and said another gas introduction portion in the direction of flow of said reaction gas is arranged to include a position serving as an inflection point in the direction of flow of said reaction gas, of a process rate when a vapor-phase process with said reaction gas is performed while said gas is not supplied into said process chamber from said plurality of gas introduction portions, a second boundary portion between said one gas introduction portion and said yet another gas introduction portion in the direction of flow of said reaction gas is arranged at a position between an upstream side end portion of said susceptor in the direction of flow of said reaction gas and said first boundary portion, and in said processing step, the gas is supplied at a different flow rate from each of said one gas introduction portion, said another gas introduction portion, and said yet another gas introduction portion, wherein a gas supplied from each of one gas introduction portion and another gas introduction portion is a purge gas, and the inflection point is the position serving as the boundary between the upstream region and the downstream region different in the rate of change in the process rate.