Apparatus for treating substrate

1. An apparatus for treating a substrate, the apparatus comprising:

a processing container having an inner space;

a support unit configured to support and rotate the substrate in the inner space;

a liquid supply unit configured to supply a treating liquid to the substrate supported by the support unit; and

an exhaust unit configured to exhaust an air flow from the inner space,

wherein the exhaust unit includes an air flow guide duct with an inlet provided to introduce the air flow into the air flow guide duct in a tangential direction to a rotating direction of the substrate supported on the support unit,

wherein the processing container comprises:

an outer cup configured to provide the inner space; and

an inner cup disposed in the inner space so as to be spaced apart from the outer cup,

wherein the air flow guide duct is provided between the outer cup and the inner cup,

wherein the air flow guide duct comprises an upper wall and a sidewall, and the inlet is formed on the sidewall.

2. The apparatus of claim 1 , wherein the air flow guide duct is provided in plural with being spaced apart from each other along a circumferential direction of the substrate supported by the support unit.

3. The apparatus of claim 1 , wherein the air flow guide duct is installed at an inner wall of the outer cup.

4. The apparatus of claim 3 , wherein the sidewall comprises:

a first side face adjacent an inner face of the outer cup;

a second side face adjacent the substrate placed on the support unit; and

a third side surface facing the tangent direction to the rotating direction of the substrate, and

the inlet is formed at the third side surface.

5. The apparatus of claim 4 , wherein the second side surface extends from the second side face and away from a rotation axis of the support unit as it moves away from the inlet.

6. The apparatus of claim 1 , wherein the support unit comprises:

a support plate configured to support the substrate;

a rotary shaft configured to rotate the support plate; and

an actuator coupled to the rotary shaft and configured to provide torque to the rotary shaft,

wherein

the inner cup is configured to surround the rotary shaft or the actuator.

7. The apparatus of claim 6 , wherein a length of the air flow guide duct extends vertically.

8. The apparatus of claim 6 , wherein the upper wall serves as a blocking face, and among the side wall the inlet is provided at a wall facing a direction parallel to a tangent line of the substrate supported by the support unit, and the remaining face may serve as a blocking face.

9. The apparatus of claim 6 , wherein the inner cup defines an exhaust space under the support plate, and the exhaust unit further includes an individual exhaust pipe for exhausting an air flow introduced into the exhaust space to the outside of the inner space.

10. The apparatus of claim 9 , wherein the exhaust unit further includes an integrated exhaust pipe located outside the processing container and provided with a pressure controlling member, and the individual exhaust pipe and the air flow guide duct are connected to the integrated exhaust pipe.

11. The apparatus of claim 1 , further comprising:

a liquid supply nozzle for supplying a photoresist to the substrate supported by the support unit.