Patent ID: 8282771

Claim:
A spin unit comprising: a rotating pair on which a substrate is rotated; a support positioned on a peripheral portion of an upper surface of the rotating part and supporting the substrate; and an injector positioned on the upper surface of the rotating part and spaced apart from a bottom surface of the substrate, the injector selectively injecting processing materials onto the bottom surface of the substrate while the substrate is rotated, wherein the processing materials includes drying gases, etching solutions and cleaning solutions and the injector comprises: a first sub-injector located at a center portion of the upper surface of the rotating part and spaced apart from a bottom surface of the substrate by a first gap distance, the drying gases being injected onto the bottom surface of the substrate through the first sub-injector; and a second sub-injector located at a central neighboring portion of the upper surface of the rotating part and spaced apart from the bottom surface of the substrate by a second gap distance, the etching solutions and the cleaning solutions being injected onto the bottom surface of the substrate through the second sub-injector, wherein the second gap distance is greater than the first gap distance.