Source: https://patents.google.com/patent/US9360765B2/en
Timestamp: 2019-08-22 16:40:12
Document Index: 135161434

Matched Legal Cases: ['art.\n3', 'art.\n10', 'Application No. 201110083335', 'Application No. 03', 'Application No. 2012', 'Application No. 2011', 'Application No. 2012', 'Application No. 201005011']

US9360765B2 - Lithographic apparatus and device manufacturing method - Google Patents
US9360765B2
US9360765B2 US14/816,997 US201514816997A US9360765B2 US 9360765 B2 US9360765 B2 US 9360765B2 US 201514816997 A US201514816997 A US 201514816997A US 9360765 B2 US9360765 B2 US 9360765B2
US14/816,997
US20150338748A1 (en
2003-06-26 Priority to EP03254059.3 priority
2003-06-26 Priority to EP03254059 priority
2003-11-12 Priority to US10/705,785 priority patent/US7075616B2/en
2004-04-26 Priority to US10/831,370 priority patent/US7110081B2/en
2006-08-07 Priority to US11/499,780 priority patent/US7932999B2/en
2010-06-08 Priority to US12/796,482 priority patent/US8446568B2/en
2013-04-19 Priority to US13/866,879 priority patent/US9097987B2/en
2015-08-03 Priority to US14/816,997 priority patent/US9360765B2/en
2015-08-03 Application filed by ASML Netherlands BV filed Critical ASML Netherlands BV
2015-08-04 Assigned to ASML NETHERLANDS B.V. reassignment ASML NETHERLANDS B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DERKSEN, ANTONIUS THEODORUS ANNA MARIA, DONDERS, SJOERD NICOLAAS LAMBERTUS, JANSEN, HANS, LOF, JOERI, LOOPSTRA, ERIK ROELOF, MULKENS, JOHANNES CATHARINUS HUBERTUS, STRAAIJER, ALEXANDER, STREEFKERK, BOB, VERSPAY, JACOBUS JOHANNUS LEONARDUS HENDRICUS, HOOGENDAM, CHRISTIAAN ALEXANDER
2015-11-26 Publication of US20150338748A1 publication Critical patent/US20150338748A1/en
2016-06-07 Publication of US9360765B2 publication Critical patent/US9360765B2/en
This is application is a continuation of U.S. patent application Ser. No. 13/866,879, filed Apr. 19, 2013, which is a divisional of U.S. patent application Ser. No. 12/796,482, filed Jun. 8, 2010, now U.S. Pat. No. 8,446,568, which is a continuation application of U.S. patent application Ser. No. 11/499,780, filed Aug. 7, 2006, now U.S. Pat. No. 7,932,999, which is a divisional application of U.S. patent application Ser. No. 10/831,370, filed Apr. 26, 2004, now U.S. Pat. No. 7,110,081, which is a continuation-in-part patent application of U.S. patent application Ser. No. 10/705,785, filed Nov. 12, 2003, now U.S. Pat. No. 7,075,616, and claims priority from European patent applications EP 02257822.3, filed Nov. 12, 2002, EP 03253636.9, filed Jun. 9, 2003, and EP 03254059.3, filed Jun. 26, 2003, each of the foregoing applications herein incorporated in its entirety by reference.
With such and other arrangements for providing liquid on only a localized area of the substrate, the substrate itself acts to contain the liquid of the liquid supply system in a space between the final element of the projection system and the substrate. If the substrate is removed (for example, during substrate exchange) and no other measures are taken, the liquid will run out of the liquid supply system. Clearly this is a situation which is to be avoided. The liquid can be removed from the space before the substrate is moved. However, as the residue of liquid which is inevitably left behind when the liquid supply system is emptied of liquid, dries, drying spots may be left behind on elements of the projection system which were immersed in the liquid during exposure. This may be clearly detrimental to the continuing high performance of the projection system. Also, on refilling the space with liquid, it may be hard to avoid the formation of bubbles. Filling of the space with liquid will also take time and may reduce throughput time.
It should be noted with regard to FIG. 1 that the source LA may be within the housing of the lithographic projection apparatus (as is often the case when the source LA is a mercury lamp, for example), but that it may also be remote from the lithographic projection apparatus, the radiation beam which it produces being led into the apparatus (e.g, with the aid of suitable directing mirrors); this latter scenario is often the case when the source LA is an excimer laser. The current invention and claims encompass both of these scenarios.
The liquid 11 is confined in the reservoir 10 by a seal 16. As illustrated in FIG. 2, the seal is a contactless seal, i.e. a gas seal. The gas seal is formed by gas, e.g, air or synthetic air, provided under pressure via inlet 15 to the gap between seal member 12 and substrate W and extracted by first outlet 14. The over pressure on the gas inlet 15, vacuum level on the first outlet 14 and the geometry of the gap are arranged so that there is a high-velocity gas flow inwards towards the optical axis of the apparatus that confines the liquid 11. As with any seal, some liquid is likely to escape, for example up the first outlet 14.
In the second embodiment, a shutter member 150 is in the form of a plate with a primary cross-sectional area larger than that of the localized area or aperture in the seal member 12. The shape of the shutter member 150 may be any shape so long as it covers the aperture. The shutter member 150 is not a substrate and is movable relative to both the substrate table WT and the seal member 12 and may be attached to the seal member 12 by any means, two examples of which are described below,
An alternative means for holding the shutter member 150 to the substrate table WT and means for attaching the shutter member 150 to the seal member 12, is illustrated in FIG. 6. In this embodiment the shutter member 150 is made of a ferromagnetic material (or partly of ferromagnetic material by making an assay) such that magnets 160, 170 (in an embodiment, electromagnets for easy attachment and detachment) positioned on the seal member 12 and substrate table WT may be used to hold the shutter member 150 in position against the seal member 12 and substrate table WT respectively. By keeping seal 16 activated, loss of liquid can be minimized. The channel 158 and duct 156, 159 arrangement described in relation to the FIG. 5 embodiment may also be employed in the FIG. 6 embodiment to reduce or alleviate liquid leakage under the shutter member 150.
Accordingly, in an embodiment, the force for supporting the substrate holder 550 and the member 520 is measured or determined before the member 520 is displaced from the substrate holder 550. For example, the force of the substrate holder actuator 560 used to support the substrate holder 550 and the member 520 may be measured. Similarly, the force for supporting the member 520 is measured or determined before the member 520 is displaced to the substrate holder 550. For example, the force of the liquid supply member actuator 510 used to hold the member 520 may be measured.
In each circumstance, the change of force can be used in a feed-forward or feedback manner. For example, the additional or reduced force for the projection system frame actuator 540, derived, for example, from the change of force in the substrate holder actuator 560 or the liquid supply member actuator 510, can be fed forward to the projection system frame actuator 540 so as to prevent or at least reduce the raising or lowering, as appropriate, of the projection system frame 500. A feed-forward loop may prevent the projection system frame 500 from lowering or raising since the feed-forward signal may be of relatively high-frequency while the band-width of the projection system frame actuator 540 typically has a low frequency.
In an embodiment, there is provided a lithographic projection apparatus comprising: a substrate table by which a substrate is held; a projection system by which a patterned beam is projected onto a target portion of the substrate, liquid being provided to a space between the projection system and the substrate; and a member having a first side and a second side opposite from the first side, the member being removably positionable adjacent to the projection system between the projection system and the substrate table so that the first side faces the projection system and the second side faces the substrate table to isolate the space provided with the liquid which contacts the first side of the member from a second space located on the second side of the member, wherein the member is separable from the substrate table and the projection system.
In an embodiment, the member is positionable opposite the projection system such that liquid can be confined between the projection system and the member. In an embodiment, the member is releasably connectable to an object in the apparatus. In an embodiment, the apparatus further comprises a vacuum-clamp by which the member is releasably connectable to the object.
In an embodiment, there is provided a lithographic projection apparatus comprising: a support structure configured to hold a patterning device, the patterning device configured to pattern a beam of radiation according to a desired pattern; a substrate table configured to hold a substrate; a projection system configured to project the patterned beam onto a target portion of the substrate; a liquid supply system comprising a container at least partly defining a space between the projection system and the substrate, the container having a selectively openable and closeable aperture therein, the aperture having an area smaller than an area of the substrate, the patterned beam capable of being projected through liquid in the space and the aperture onto the substrate; and a closure configured to selectively close and open the aperture.
In an embodiment, the closure is positionable on a side of the liquid supply system opposite the projection system such that liquid can be confined in the liquid supply system and between the projection system and the closure. In an embodiment, the closure is releasably connectable to the liquid supply system. In an embodiment, the closure is separable from the remainder of the apparatus. In an embodiment, the closure is displaced from the liquid supply system when connected to the liquid supply system. In an embodiment, the apparatus comprises a magnet, a vacuum outlet, or both, configured to connect the closure to the liquid supply system. In an embodiment, the container comprises a gas inlet and a vacuum outlet configured to form a seal between the container and the closure. In an embodiment, the container comprises a projection extending from a surface of the container facing the closure and positioned outward of the closure. In an embodiment, the projection is retractable into the container. In an embodiment, the closure comprises a channel in a surface of the closure facing the aperture. In an embodiment, the channel is less than or equal to 10 micrometers deep. In an embodiment, the closure comprises a plurality of concentric channels provided at a location on the surface of the closure corresponding to a bound of the aperture. In an embodiment, the closure comprises a plurality of radial channels. In an embodiment, the liquid supply system comprises at least one inlet to supply liquid onto the substrate and at least one outlet to remove liquid after the liquid has passed under the projection system. In an embodiment, the liquid supply system is configured to provide the liquid to a space between a final lens of the projection system and the substrate.
In an embodiment, there is provided a device manufacturing method comprising: providing a liquid to a space between a projection system and a substrate, the space having a selectively openable and closeable aperture thereto, the aperture having an area smaller than an area of the substrate; projecting a patterned beam of radiation, through the liquid and the aperture, onto a target portion of the substrate using the projection system; and selectively opening and closing the aperture with a closure.
In an embodiment, the closure is separable from the remainder of a lithographic apparatus. In an embodiment, the method comprises releasably connecting the closure to a liquid supply system used to provide the liquid to the space. In an embodiment, the closure is displaced from the liquid supply system when connected to the liquid supply system. In an embodiment, the method comprises connecting the closure to the liquid supply system using a magnetic force, a vacuum, or both. In an embodiment, the method comprises forming a seal between a structure of the liquid supply system and the closure using a gas inlet and a vacuum outlet of the structure. In an embodiment, a structure of the liquid supply system comprises a projection extending from a surface of the structure facing the closure and positioned outward of the closure. In an embodiment, the method comprising retracting the projection into the structure. In an embodiment, the closure comprises a channel in a surface of the closure facing the aperture. In an embodiment, the channel is less than or equal to 10 micrometers deep. In an embodiment, the closure comprises a plurality of concentric channels provided at a location on the surface of the closure corresponding to a bound of the aperture. In an embodiment, the closure comprises a plurality of radial channels. In an embodiment, providing the liquid comprises supplying the liquid onto the substrate through at least one inlet and removing the liquid, after the liquid has passed under the projection system, through at least one outlet.
In an embodiment, there is provided a lithographic projection apparatus comprising: a support structure configured to hold a patterning device, the patterning device configured to pattern a beam of radiation according to a desired pattern; a substrate table configured to hold a substrate; a projection system configured to project the patterned beam onto a target portion of the substrate; a liquid supply system configured to provide liquid to a space between the projection system and the substrate; and a shutter configured to isolate the space from the substrate or a space to be occupied by a substrate.
In an embodiment, the shutter is positionable on a side of the liquid supply system opposite the projection system such that liquid can be confined in the liquid supply system and between the projection system and the shutter. In an embodiment, the shutter is releasably connectable to the liquid supply system. In an embodiment, the shutter is separable from the remainder of the apparatus. In an embodiment, the shutter is displaced from the liquid supply system when connected to the liquid supply system. In an embodiment, the apparatus comprises a magnet, a vacuum outlet, or both, configured to connect the shutter to the liquid supply system. In an embodiment, the liquid supply system comprises a gas inlet and a vacuum outlet configured to form a seal between the liquid supply system and the shutter. In an embodiment, the shutter comprises a channel in a surface of the shutter facing the projection system. In an embodiment, the channel is less than or equal to 10 micrometers deep. In an embodiment, the shutter comprises a plurality of concentric channels. In an embodiment, the shutter comprises a plurality of radial channels. In an embodiment, the liquid supply system comprises at least one inlet to supply the liquid onto the substrate and at least one outlet to remove the liquid after the liquid has passed under the projection system. In an embodiment, the liquid supply system is configured to provide the liquid to a space between a final lens of the projection system and the substrate.
The embodiments herein have been described in relation to the seal member variant of the localized area solution. However, the embodiments as described herein are equally applicable to any other type of liquid supply for example those disclosed in European Patent application nos. 03254078.3 or 03256643.2 hereby incorporated in their entirety by reference or to the variant illustrated in FIGS. 9 and 10. For example, in the case of a shutter member 150 moveable relative to both the substrate table WT and the projection system PL, means for attaching the shutter member below the in- and outlets IN, OUT may be attached to the members forming the in-and-out-lets IN, OUT, or to a separate structure. Additionally or alternatively, the vacuum of the outlets OUT can be used to attract the shutter member to the IN- and outlets IN, OUT and thereby seal the aperture. It may be desirable to use a non-flat shutter member e.g. one with a protruding border so that any drips of liquid from the various in- and out-lets are contained. Any system for generating a force can be used for the means for attaching, including low pressure sources, magnetic means, mechanical means, electro static means, etc.
a container structure at least partly defining a space between the projection system and the table, the container structure comprising an aperture having a cross-sectional area smaller than a cross-sectional area of the substrate, wherein the patterned beam is capable of being projected through the aperture onto the substrate;
an opening configured to supply liquid to the space; and
a closure part of the container structure, the closure part movable relative to another part of the container structure to selectively close and open the aperture.
2. The apparatus of claim 1, wherein the closure part is positionable on a side of the container structure opposite the projection system such that liquid can be confined in the container structure and between the projection system and the closure part.
3. The apparatus of claim 1, wherein the closure part is releasable from the container structure.
4. The apparatus of claim 3, wherein the closure part is separable from the remainder of the apparatus.
5. The apparatus of claim 1, wherein the container structure comprises an outlet configured to remove liquid from the space, the outlet located in a lower surface of the container structure facing during exposure the table and/or substrate.
6. The apparatus of claim 1, wherein the container structure comprises a channel configured to have the closure part therein.
7. The apparatus of claim 1, wherein the closure part is within the container structure.
providing a liquid to a container structure at least partly defining a space between a projection system of a lithographic apparatus and a substrate, the container structure comprising an aperture having a cross-sectional area smaller than a cross-sectional area of the substrate;
selectively opening and closing the aperture by moving a closure part of the container structure with respect to another part of the container structure.
9. The method of claim 8, wherein the closure part is positionable on a side of the container structure opposite the projection system such that liquid can be confined in the container structure and between the projection system and the closure part.
10. The method of claim 8, further comprising releasing the closure part from the container structure.
11. The method of claim 10, wherein the closure part is separable from the remainder of the lithographic apparatus.
12. The method of claim 8, further comprising removing liquid from the space using an outlet of the container structure, the outlet located in a lower surface of the container structure facing during exposure the substrate.
13. The method of claim 8, further comprising moving the closure part within a channel of the container structure.
14. The method of claim 8, wherein the closure part is within the container structure.
an opening formed in the container structure and configured to supply liquid to the space; and
a closure movable within or on the container structure to selectively close and open the aperture.
16. The apparatus of claim 15, wherein the closure comprises a plate.
17. The apparatus of claim 15, wherein the container structure comprises an outlet configured to remove liquid from the space, the outlet located in a lower surface of the container structure facing during exposure the table and/or substrate.
18. The apparatus of claim 15, wherein the container structure comprises a channel configured to have the closure move therein.
19. The apparatus of claim 15, wherein the closure part is positionable on a side of the container structure opposite the projection system such that liquid can be confined in the container structure and between the projection system and the closure.
20. The apparatus of claim 15, wherein the opening is part of the container structure and located above the aperture.
US14/816,997 2002-11-12 2015-08-03 Lithographic apparatus and device manufacturing method Active US9360765B2 (en)
EP03254059.3 2003-06-26
US10/705,785 US7075616B2 (en) 2002-11-12 2003-11-12 Lithographic apparatus and device manufacturing method
US10/831,370 US7110081B2 (en) 2002-11-12 2004-04-26 Lithographic apparatus and device manufacturing method
US11/499,780 US7932999B2 (en) 2002-11-12 2006-08-07 Lithographic apparatus and device manufacturing method
US12/796,482 US8446568B2 (en) 2002-11-12 2010-06-08 Lithographic apparatus and device manufacturing method
US13/866,879 US9097987B2 (en) 2002-11-12 2013-04-19 Lithographic apparatus and device manufacturing method
US14/816,997 US9360765B2 (en) 2002-11-12 2015-08-03 Lithographic apparatus and device manufacturing method
US15/167,357 US9588442B2 (en) 2002-11-12 2016-05-27 Lithographic apparatus and device manufacturing method
US15/448,438 US9885965B2 (en) 2002-11-12 2017-03-02 Lithographic apparatus and device manufacturing method
US15/862,604 US20180129143A1 (en) 2002-11-12 2018-01-04 Lithographic apparatus and device manufacturing method
US13/866,879 Continuation US9097987B2 (en) 2002-11-12 2013-04-19 Lithographic apparatus and device manufacturing method
US15/167,357 Continuation US9588442B2 (en) 2002-11-12 2016-05-27 Lithographic apparatus and device manufacturing method
US20150338748A1 US20150338748A1 (en) 2015-11-26
US9360765B2 true US9360765B2 (en) 2016-06-07
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US12/796,482 Active 2024-06-04 US8446568B2 (en) 2002-11-12 2010-06-08 Lithographic apparatus and device manufacturing method
US13/866,879 Active US9097987B2 (en) 2002-11-12 2013-04-19 Lithographic apparatus and device manufacturing method
US14/816,997 Active US9360765B2 (en) 2002-11-12 2015-08-03 Lithographic apparatus and device manufacturing method
US15/167,357 Active US9588442B2 (en) 2002-11-12 2016-05-27 Lithographic apparatus and device manufacturing method
US15/448,438 Active US9885965B2 (en) 2002-11-12 2017-03-02 Lithographic apparatus and device manufacturing method
US15/862,604 Pending US20180129143A1 (en) 2002-11-12 2018-01-04 Lithographic apparatus and device manufacturing method
US (8) US7110081B2 (en)
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2004-04-26 US US10/831,370 patent/US7110081B2/en active Active
2006-08-07 US US11/499,780 patent/US7932999B2/en active Active
2010-06-08 US US12/796,482 patent/US8446568B2/en active Active
2013-04-19 US US13/866,879 patent/US9097987B2/en active Active
2015-08-03 US US14/816,997 patent/US9360765B2/en active Active
2016-05-27 US US15/167,357 patent/US9588442B2/en active Active
2017-03-02 US US15/448,438 patent/US9885965B2/en active Active
2018-01-04 US US15/862,604 patent/US20180129143A1/en active Pending
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