Environmental system including vacuum scavenge for an immersion lithography apparatus

Patent metadata

Field	Value
Publication number	US-9244362-B2
Application number	US-201414324607-A
Country	US
Kind code	B2
Filing date	Jul 7, 2014
Priority date	Apr 10, 2003
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A liquid immersion exposure apparatus includes an optical assembly having a final optical element, from which exposure light is projected through immersion liquid filling an optical path of the exposure light under the final optical element, a containment member surrounding a tip portion of the optical assembly, and a movable stage to hold a substrate and having an upper surface around the held substrate. An apparatus frame supports the optical assembly and the containment member, and an optical mount isolator, which has an actuator, isolates the optical assembly from vibrations of the apparatus frame. A first inlet of the containment member faces at least one of the substrate and the stage and collects fluid from a gap between the containment member and the at least one of the substrate and the stage. A gas supply outlet of the containment member supplies gas to the gap.

First claim

What is claimed is:

1. A liquid immersion exposure apparatus comprising:
an optical assembly having a final optical element, from which exposure light is projected through immersion liquid filling an optical path of the exposure light under the final optical element;
a containment member having a first inlet and a gas supply outlet, the containment member surrounding a tip portion of the optical assembly;
a stage configured to hold a substrate and that has an upper surface around the held substrate, the stage being movable below and relative to the optical assembly and the containment member;
a frame by which the optical assembly and the containment member are supported; and
an optical mount isolator which has an actuator and which isolates the optical assembly from vibrations of the frame, wherein the optical mount isolator does not isolate the containment member from the vibrations of the frame;
wherein:
the first inlet of the containment member is arranged to face at least one of the substrate and the stage and collects fluid from a gap between the containment member and the at least one of the substrate and the stage, and
the gas supply outlet of the containment member supplies gas to the gap.

2. The apparatus according to claim 1 , wherein the actuator controls the position of the optical assembly.

3. The apparatus according to claim 1 , wherein the actuator isolates vibration.

4. The apparatus according to claim 1 , wherein the optical mount isolator has a pneumatic cylinder.

5. The apparatus according to claim 1 , wherein the optical mount isolator has a pneumatic device that isolates vibration.

6. The apparatus according to claim 1 , wherein the optical mount isolator is used to kinematically secure the optical assembly to the frame.

7. The apparatus according to claim 1 , wherein the gas supply outlet is arranged radially-outwardly from the first inlet with respect to the optical path.

8. The apparatus according to claim 7 , further comprising a second inlet which is arranged radially-outwardly from the gas supply outlet with respect to the optical path and which collects fluid.

9. The apparatus according to claim 8 , wherein the second inlet is arranged to face at least one of the substrate and the stage.

10. The apparatus according to claim 8 , wherein the containment member has the second inlet.

11. The apparatus according to claim 10 , wherein the second inlet collects the fluid from the gap between the containment member and the at least one of the substrate and the stage.

12. The apparatus according to claim 7 , further comprising a liquid supply outlet via which the immersion liquid is supplied, wherein the first inlet is arranged radially outwardly from the liquid supply outlet with respect to the optical path.

13. The apparatus according to claim 1 , further comprising a second inlet which is arranged to face at least one of the substrate and the stage and which collects fluid.

14. The apparatus according to claim 13 , wherein the containment member has the second inlet.

15. The apparatus according to claim 13 , wherein the second inlet collects the fluid from the gap between the containment member and the at least one of the substrate and the stage.

16. The apparatus according to claim 1 , further comprising:
a liquid supply outlet via which the immersion liquid is supplied; and
a liquid collection inlet via which the immersion liquid is collected,
wherein the gas supply inlet is arranged radially outwardly from the liquid collection inlet with respect to the optical path, and the liquid collection inlet is arranged radially outwardly from the liquid supply outlet with respect to the optical path.

17. The apparatus according to claim 16 , wherein the liquid supply outlet and the liquid collection inlet are arranged at a substantially same height.

18. The apparatus according to claim 1 , further comprising:
a liquid supply outlet via which the immersion liquid is supplied; and
a liquid collection inlet via which the immersion liquid is collected,
wherein the liquid supply outlet supplies the immersion liquid between the optical assembly and the containment member and the liquid collection inlet collects the immersion liquid from between the optical assembly and the containment member.

19. The apparatus according to claim 18 , wherein the liquid supply outlet and the liquid collection inlet are arranged at a substantially same height.

20. The apparatus according to claim 18 , wherein the liquid supply outlet and the liquid collection inlet are arranged higher than the gas supply outlet and the first inlet.

21. The apparatus according to claim 1 , wherein the containment member is supported by the frame using a support system which has a second actuator.

22. The apparatus according to claim 21 , wherein the containment member is moved using the second actuator.

23. The apparatus according to claim 22 , wherein the position of the containment member is adjusted using the second actuator.

24. The apparatus according to claim 21 , wherein the support system has a measurement system that monitors the position of the containment member.

25. The apparatus according to claim 24 , wherein the position of the containment member is adjusted using the second actuator based on the result of the monitoring by the measurement system.

26. The apparatus according to claim 21 , wherein the support system is arranged between the containment member and the frame.

27. The apparatus according to claim 1 , wherein the containment member is supported by the frame using a support system which has a flexure.

28. The apparatus according to claim 27 , wherein the support system is arranged between the containment member and the frame.

29. The apparatus according to claim 1 , wherein the upper surface of the stage is in approximately a same plane as a surface of the substrate.

30. A device manufacturing method comprising:
exposing a substrate using the apparatus according to claim 1 , and
developing the exposed substrate.

31. A liquid immersion exposure method comprising:
containing immersion liquid in a space under a final optical element of an optical assembly to fill an optical path of exposure light from the final optical element, by using a containment member which is arranged to surround a tip portion of the optical assembly;
projecting the exposure light through the immersion liquid in the space onto a substrate held on a stage which has an upper surface around the held substrate and which is movable below and relative to the optical assembly and the containment member;
collecting fluid from a gap between the containment member and at least one of the substrate and the stage via a first inlet of the containment member, the first inlet being arranged to face at least one of the substrate and the stage; and
supplying gas to the gap via a gas supply inlet of the containment member, wherein the optical assembly and the containment member are supported by a frame; and
wherein the optical assembly is isolated from vibrations of the frame using an optical mount isolator which has an actuator, and the optical mount isolator does not isolate the containment member from the vibrations of the frame.

32. The method according to claim 31 , wherein the actuator control

Assignees

• Nikon Corp

Inventors

• Hazelton Andrew J
• Sogard Michael

Classifications

• G03F7/70816

  Bearings · CPC title

• G03F7/70775

  Position control, e.g. interferometers or encoders for determining the stage position · CPC title

• G03F7/2041 Primary

  in the presence of a fluid, e.g. immersion; using fluid cooling means · CPC title

• G03F7/70866

  of mask or workpiece · CPC title

• G03F7/70341 Primary

  Details of immersion lithography aspects, e.g. exposure media or control of immersion liquid supply (chemical composition of immersion liquids G03F7/2041) · CPC title