Substrate processing apparatus including exhaust ports and substrate processing method

Abstract

Provided is a substrate processing apparatus. The substrate processing apparatus in which processes with respect to substrates are performed includes a lower chamber having an opened upper side, the lower chamber including a passage allowing the substrates to pass therethrough in a side thereof, an external reaction tube closing the opened upper side of the lower chamber to provide a process space in which the processes are performed, a substrate holder on which the one or more substrates are vertically stacked, the substrate holder being movable between a stacking position in which the substrates are stacked within the substrate holder and a process position in which the processes with respect to the substrates are performed, at least one supply nozzle disposed along an inner wall of the external reaction tube, the at least one supply nozzle having a supply hole for discharging a reaction gas, at least one exhaust nozzle disposed along the inner wall of the external reaction tube, the at least one exhaust nozzle having an exhaust hole for suctioning an non-reaction gas and byproducts within the process space, and a rear exhaust line connected to the exhaust nozzle to discharge the non-reaction gas and the byproducts which are suctioned through the exhaust hole. The lower chamber includes an exhaust port connecting the exhaust nozzle to the rear exhaust line and an auxiliary exhaust port connecting a stacking space defined within the lower chamber to the rear exhaust line.