Patent ID: 7857939

Claim:
A wafer treatment apparatus comprising: a wafer treating unit including a plurality of chambers; a fluid supply unit including a first supply that supplies a first fluid in a supercritical state to the wafer treating unit and a second supply that supplies a mixture of the first fluid and a second fluid to the wafer treating unit; a plurality of first supply lines, each of which is connected between the first supply and one of the plurality of chambers and feeds the first fluid from the first supply into the plurality of chambers; a plurality of second supply lines, each of which is connected between the second supply and one of the plurality of chambers and supplies the mixture from the second supply to the plurality of chambers; a plurality of first valves disposed on the corresponding plurality of first supply lines that allow or block flow of the first fluid through the plurality of first supply lines; a plurality of second valves disposed on the corresponding plurality of second supply lines that allow or block flow of the mixture through the plurality of second supply lines; and a controller configured to select a first chamber of the plurality of chambers for wafer treatment in order to control the open/closed state of each of the plurality of first valves so that the first fluid can be supplied only to the first chamber of the plurality of chambers and selecting a second chamber of the plurality of chambers in order to control the open/closed state of each of the plurality of second valves so that the mixture supplied from the second supply can be supplied only to the second chamber of the plurality of chambers, wherein each of the plurality of chambers comprises: a pair of cases mutually fitted to open and close in order to define a treatment space for treating wafers; and a plurality of chucks that are fixed to the pair of cases and support the wafers within the treatment space, the number of the plurality of chucks corresponding to the number of the wafers within the treatment space.