VAPOR PHASE GROWTH APPARATUS
Disclosed is a rotation/revolution type vapor phase growth apparatus that can maintain constant flow rates of a purge gas and a raw material gas when a raw material gas introducing direction is set to be the same as a susceptor rotation introducing direction. Inside a hollow drive shaft 12 supporting and rotating a disk-shaped susceptor 13, a raw material gas supply tube 20 is coaxially disposed, and between the hollow drive shaft and the raw material gas supply tube, a purge gas flow path 21 is formed. Additionally, in a purge gas introducing nozzle introducing a purge gas in an outer circumferential direction of a flow channel 18 from the purge gas flow path, a gas introducing path 19 c is formed in a direction parallel to an upper surface of the susceptor in such a manner as to make a vertical dimension of the gas introducing path constant.
1 . A vapor phase growth apparatus comprising a disk-shaped susceptor supported by a hollow drive shaft to be rotatably provided inside a chamber; a plurality of external gear members, each external gear member being provided rotatably in a circumferential direction of an outer periphery of the susceptor; a ring-shaped fixed internal gear member having an internal gear meshing with the each external gear member; a heating unit for heating each substrate retained by the each external gear member; a flow channel for introducing a raw material gas in a direction parallel to a surface of the substrate; a nozzle for introducing the gas in an outer circumferential direction from a center portion of the flow channel; and a raw material gas supply tube for supplying the raw material gas to the nozzle, the raw material gas supply tube being disposed coaxially inside the hollow drive shaft, wherein a purge gas flow path for flowing a purge gas in a direction of the flow channel is formed between an inner circumferential surface of the hollow drive shaft and the raw material gas supply tube, and a purge gas introducing nozzle for introducing the purge gas in the outer circumferential direction of the flow channel from the purge gas flow path is formed in a direction parallel to an upper surface of the susceptor in such a manner as to make a vertical dimension of the nozzle constant.
2 . The vapor phase growth apparatus according to claim 1 , wherein the nozzle is projectingly provided in a disk shape by being bent in the outer circumferential direction of the flow channel from an upper end of the raw material gas supply tube; a vertical dimension of a gas flow path at a tip portion of the raw material gas nozzle is made smaller than a vertical dimension of a gas flow path on a base portion side of the raw material gas nozzle; and the nozzle tip portion with the smaller vertical dimension has a length no less than 1.5 times the vertical dimension of the gas flow path on the base portion side of the nozzle.