Electrostatic chuck including a heater mechanism
View Patent ↗An electrostatic chuck comprises a main body with a mounting surface and an opposed surface facing away from the mounting surface. At least one chucking electrode extends along the mounting surface of the main body and a first heater layer extends along the opposed surface of the main body. The electrostatic chuck can be used to heat and electrostatic ally attract a work piece, such as a wafer, to a work piece support surface during various processing techniques.
1. An electrostatic chuck comprising:
a main body encapsulated in an insulating coating layer, said main body comprising a mounting surface, an opposed surface facing away from the mounting surface, and a peripheral surface;
at least one chucking electrode extending along the mounting surface of the main body;
a first heater layer extending along the opposed surface of the main body;
a second heater layer extending along the peripheral surface of the main body;
a plurality of terminals located on said peripheral surface, and
a first heat retainer adapted to inhibit heat transfer away from the main body, wherein the first heat retainer extends along the opposed surface of the main body and comprises a plurality of adjacent disks.
2. The electrostatic chuck of claim 1 for heating a wafer to a temperature of at least 800° C.
3. The electrostatic chuck of claim 2 , wherein said insulating coating layer comprises at least one of a nitride, carbide, carbonitride or oxynitride of elements selected from a group consisting of B, Al, Si, Ga, refractory hard metals, transition metals, and rare earth metals, or complexes and/or combinations thereof.
4. The electrostatic chuck of claim 3 , wherein said main body comprises pyrolytic graphite and said insulating coating layer comprises pyrolytic boron nitride.
5. The electrostatic chuck of claim 1 , further including a second heat retainer adapted to inhibit heat transfer away from the main body, wherein the second heat retainer extends along the peripheral surface of the main body.
6. The electrostatic chuck of claim 5 , wherein the second heat retainer comprises a plurality of rings.
7. The electrostatic chuck of claim 1 , wherein said main body has an inverted cup shape, an inverted bowl shape, or an inverted hat shape.
8. An electrostatic chuck comprising:
a main body encapsulated in an insulating coating layer, said main body comprising a mounting surface and an opposed surface facing away from the mounting surface;
at least one chucking electrode extending along the mounting surface of the main body;
a heater layer extending along the opposed surface of the main body;
and a heat retainer adapted to inhibit heat transfer away from the main body and extending along the opposed surface of the main body, wherein the heat retainer comprises a plurality of adjacent disks.
9. The electrostatic chuck of claim 8 , wherein said insulating coating layer comprises at least one of a nitride, carbide, carbonitride or oxynitride of elements selected from a group consisting of B, Al, Si, Ga, refractory hard metals, transition metals, and rare earth metals, or complexes and/or combinations thereof.
10. The electrostatic chuck of claim 9 , wherein said main body comprises pyrolytic graphite and said insulating coating layer comprises pyrolytic boron nitride.
11. The electrostatic chuck of claim 8 , wherein the heat retainer comprises a heat reflective material.
12. The electrostatic chuck of claim 8 , wherein the heat retainer comprises an insulation material.
13. An electrostatic chuck comprising:
a main body encapsulated in an insulating coating layer, said main body comprising a mounting surface and an opposed surface facing away from the mounting surface; at least one chucking electrode extending along the mounting surface of the main body; a heater layer extending along the opposed surface of the main body; and a heat retainer adapted to inhibit heat transfer away from the main body and extending along the opposed surface of the main body, wherein the heat retainer comprises a ceramic felt insulation material.
14. An electrostatic chuck comprising:
a main body encapsulated in an insulating coating layer, said main body comprising a plate including a mounting surface and an opposed surface facing away from the mounting surface, and a reinforcing member extending away from the plate, wherein the reinforcing member is adapted to inhibit flexing of the plate;
at least one chucking electrode extending along the mounting surface of the plate;
a heater layer extending along the opposed surface of the plate, wherein said insulating coating layer comprises at least one of a nitride, carbide, carbonitride or oxynitride of elements selected from a group consisting of B, Al, Si, Ga, refractory hard metals, transition metals, and rare earth metals, or complexes and or combinations thereof:
wherein the reinforcing member comprises a wall having a first end portion attached to the plate and a second end portion offset from the plate wherein the wall extends from the first end portion to the second end portion
wherein the wall and the plate define an interior cavity
wherein the electrostatic chuck further comprises a heat retainer adapted to inhibit heat transfer away from the main body, wherein the heat retainer is positioned in the interior cavity and extends along the opposed surface of the main body and wherein the heat retainer comprises a plurality of adjacent disks, and each of the plurality of disks includes an outer diameter that is slightly less than a cavity diameter of the interior cavity.
15. The electrostatic chuck of claim 14 , further comprising a first terminal adapted to supply electricity to the chucking electrode and a second terminal adapted to supply electricity to the heater layer, wherein the first and second terminals are each mounted at the second end portion of the wall.
16. The electrostatic chuck of claim 14 , wherein the wall comprises a substantially cylindrical wall and the first end portion of the wall is attached at a peripheral area of the plate.
17. The electrostatic chuck of claim 16 , wherein the cylindrical wall has a substantially circular cross section and the plate comprises a substantially circular plate wherein the first end portion of the wall is attached at a circular peripheral area of the plate.
18. The electrostatic chuck of claim 14 , further comprising a foot having a first end attached to the second end portion of the wall and a second end extending away from the second end portion of the wall.
19. An electrostatic chuck comprising:
a main body encapsulated in an insulating coating layer, said main body comprising a plate including a mounting surface and an opposed surface facing away from the mounting surface, and a reinforcing member extending away from the plate, wherein the reinforcing member is adapted to inhibit flexing of the plate;
at least one chucking electrode extending along the mounting surface of the plate; and
a heater layer extending along the opposed surface of the plate, wherein said insulating coating layer comprises at least one of a nitride, carbide, carbonitride or oxynitride of elements selected from a group consisting of B, Al, Si, Ga, refractory hard metals, transition metals, and rare earth metals, or complexes and/or combinations thereof, wherein the reinforcing member comprises a wall having a first end portion attached to the plate and a second end portion offset from the plate wherein the wall extends from the first end portion to the second end portion, and wherein the wall includes a plurality of apertures adapted to inhibit heat transfer from the first end portion towards the second end portion of the wall.
20. The electrostatic chuck of claim 19 for heating a wafer to a temperature of at least 800° C.