Supporting unit and substrate treating apparatus including the same

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

a chamber having a treatment space configured to treat the substrate;

a supporting unit configured to support the substrate inside the treatment space;

a gas supplying unit configured to supply process gas into the treatment space; and

a plasma source configured to generate plasma based on the process gas inside the treatment space,

wherein the supporting unit includes,

a supporting plate configured to receive the substrate;

a focus ring configured to surround the substrate supported by the supporting plate;

a temperature control unit configured to adjust a temperature of the focus ring, the temperature control unit includes,

a first heater configured to heat the focus ring, the first heater under the focus ring and opposite to the focus ring;

a cooling member under the first heater;

a heat transfer sheet between the first heater and the focus ring; and

a second heater at a position opposite to the first heater, between the first heater and the cooling member.

2. The apparatus of claim 1 , wherein the supporting unit further comprises:

a body in a ring shape and under the focus ring, and

wherein the cooling member is inside the body.

3. The apparatus of claim 2 , wherein the first heater and the second heater are in the body.

4. The apparatus of claim 2 , wherein the heat transfer sheet is between the focus ring and the body, and has a higher heat transfer rate than a heat transfer rate of the body.

5. The apparatus of claim 4 , wherein the supporting unit further comprises:

a heat transfer sheet guard which surrounds an inner surface of the heat transfer sheet and an outer surface of the heat transfer sheet.

6. The apparatus of claim 5 , wherein the heat transfer sheet guard is accompanied by the body.

7. The apparatus of claim 5 , wherein

the focus ring has a bottom surface stepped to make a difference in height between an inner region and an outer region of the bottom surface,

a top surface of the body is stepped to be engaged with the bottom surface of the focus ring, and

the heat transfer sheet includes,

an inner sheet corresponding to the inner region; and

an outer sheet corresponding to the outer region.

8. The apparatus of claim 7 , wherein the heat transfer sheet guard comprises:

an inner guard which surrounds an inner surface and an outer surface of the inner sheet; and

an outer guard which surrounds an inner surface and an outer surface of the outer sheet.

9. The apparatus of claim 2 , wherein the temperature control unit comprises:

a temperature measuring member configured to measure the temperature of the focus ring; and

a controller configured to control the first heater, the second heater, and the cooling member depending on the temperature measured by the temperature measuring member.

10. The apparatus of claim 9 , wherein

the controller is configured to increase a temperature of the first heater, increase a temperature of the cooling member, and increase a temperature of the second heater based on the temperature of the focus ring being below a specific temperature range, the temperature measuring member being configured to measure the temperature of the focus ring; and

the controller is configured to decrease the temperature of the first heater, decrease the temperature of the cooling member, and decrease the temperature of the second heater, based on the temperature of the focus ring being above a specific temperature range, the temperature measuring member being configured to measure the temperature of the focus ring.

11. The apparatus of claim 2 ,

wherein the focus ring includes,

at least one material of silicon (Si), silicon carbide (SiC), quartz, yttrium oxide (Y 2 O 3 ), and alumina (Al 2 O 3 ), and

wherein the body includes,

at least one material of quartz, yttrium oxide (Y 2 O 3 ), and alumina (Al 2 O 3 ).