Patent ID: 8842257

Claim:
A substrate treatment apparatus for performing treatment on a substrate on which a resist pattern mask has been formed by exposure and developing treatment to improve roughness of the resist pattern mask, said apparatus comprising: a treatment container including a lid body which includes a side wall part forming a peripheral edge portion of the lid body and an upper wall part surrounded by the side wall part; a gas supply part provided in a center portion on a rear surface side of the upper wall part; a stage provided in said treatment container; a solvent gas supply part for supplying a solvent gas for swelling the resist pattern mask, from the gas supply part to the substrate mounted on said stage; a drying gas supply part, for supplying a drying gas for drying the solvent supplied to the substrate, from the gas supply part to the substrate mounted on said stage; an exhaust port provided in a lower end of the side wall part for exhausting the solvent gas and the drying gas; and a control unit for outputting a control signal for controlling supply of the solvent gas by said solvent gas supply part, supply of the drying gas by said drying gas supply part, and exhaust from said exhaust port, wherein said control unit outputs the control signal to repeat a plurality of times steps of supplying the solvent gas from the gas supply part to the substrate while exhausting the solvent gas from the exhaust port, and then supplying the drying gas from the gas supply part to the substrate while exhausting the drying gas from the exhaust port.