Patent ID: 7386944

Claim:
An apparatus for drying a wafer comprising: a drying tank for disposing the wafer; a support unit disposed in the drying tank, the support unit for supporting the wafer; a first nozzle disposed at a first inner side of the drying tank and a second nozzle disposed at a second inner side of the drying tank, the first and second nozzles for spraying a drying gas on the wafer; and a drying gas supply unit comprising a first supply member, a second supply member, a first reservoir and a second reservoir, the first supply member connected to the first nozzle and the second supply member connected to the second nozzle, the first supply member including a first heater connected to the first reservoir, a first pump connected to the second reservoir and a third heater connected to the first heater and the first pump through a first pipe, the second supply member including a second heater connected to the first reservoir, a second pump connected to the second reservoir and a fourth heater connected to the second heater and the second pump though a second pipe, the first and second pumps having individually controlled moving cycles for alternately and periodically providing respectively different amounts of the drying gas into the drying tank through each of the first and second nozzles, respectively, wherein when the first pump provides a maximum amount of drying gas, the second pump provides a minimum amount of drying gas, and wherein the first pump maximum and the second pump maximum are sequentially and successively repeated with a predetermined frequency, so that a total internal pressure of the drying tank above a predetermined internal pressure of the drying tank is maintained when drying the wafer.