WO2006001459A1 - Euv光源、euv露光装置、及び半導体デバイスの製造方法 - Google Patents
Euv光源、euv露光装置、及び半導体デバイスの製造方法 Download PDFInfo
- Publication number
- WO2006001459A1 WO2006001459A1 PCT/JP2005/011865 JP2005011865W WO2006001459A1 WO 2006001459 A1 WO2006001459 A1 WO 2006001459A1 JP 2005011865 W JP2005011865 W JP 2005011865W WO 2006001459 A1 WO2006001459 A1 WO 2006001459A1
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- WIPO (PCT)
- Prior art keywords
- light source
- euv light
- target
- euv
- plasma
- Prior art date
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70008—Production of exposure light, i.e. light sources
- G03F7/70033—Production of exposure light, i.e. light sources by plasma extreme ultraviolet [EUV] sources
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70008—Production of exposure light, i.e. light sources
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G2/00—Apparatus or processes specially adapted for producing X-rays, not involving X-ray tubes, e.g. involving generation of a plasma
- H05G2/001—X-ray radiation generated from plasma
- H05G2/003—X-ray radiation generated from plasma being produced from a liquid or gas
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G2/00—Apparatus or processes specially adapted for producing X-rays, not involving X-ray tubes, e.g. involving generation of a plasma
- H05G2/001—X-ray radiation generated from plasma
- H05G2/003—X-ray radiation generated from plasma being produced from a liquid or gas
- H05G2/005—X-ray radiation generated from plasma being produced from a liquid or gas containing a metal as principal radiation generating component
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G2/00—Apparatus or processes specially adapted for producing X-rays, not involving X-ray tubes, e.g. involving generation of a plasma
- H05G2/001—X-ray radiation generated from plasma
- H05G2/008—X-ray radiation generated from plasma involving a beam of energy, e.g. laser or electron beam in the process of exciting the plasma
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K2201/00—Arrangements for handling radiation or particles
- G21K2201/06—Arrangements for handling radiation or particles using diffractive, refractive or reflecting elements
- G21K2201/064—Arrangements for handling radiation or particles using diffractive, refractive or reflecting elements having a curved surface
Definitions
- EUV light source EUV exposure apparatus, and semiconductor device manufacturing method
- the present invention relates to an EUV light source that generates EUV light (in this specification and claims, light having a wavelength of 100 nm or less), and uses this EUV light source.
- the present invention relates to an EUV exposure apparatus and a semiconductor device manufacturing method using the EUV exposure apparatus. Background art
- the resolution of an exposure apparatus is proportional to the numerical aperture (NA) of the transfer optical system and inversely proportional to the wavelength of light used for exposure. Therefore, one attempt to increase the resolution is to use EUV (sometimes called soft X-ray) light sources with a short wavelength for exposure transfer instead of visible light and ultraviolet light.
- EUV sometimes called soft X-ray
- LPP Laser Produced Plasma
- LPP focuses pulse laser light on a target material in a vacuum vessel, turns the target material into plasma, and uses EUV light radiated from this plasma. It is small and has a brightness comparable to that of an undulator.
- EUV light sources using discharge plasma such as Dense Plasma Focus (DPF) are small in size, have a large EUV light intensity, and are low in cost. These have recently attracted attention as light sources for EUV exposure systems using EUV with a wavelength of 13.5 nm.
- DPF Dense Plasma Focus
- FIG. 6 shows an overview of such an EUV exposure system.
- I R 1 to I R 4 are reflectors of the illumination optical system
- PR 1 to P R 4 are reflectors of the projection optical system.
- W is a wafer and M is a mask.
- the laser light emitted from the laser light source L is focused on the target S, and X-rays are generated from the target S by a plasma phenomenon.
- This X-ray is reflected by the reflecting mirrors C and D, and enters the illumination optical system as a parallel X-ray.
- the light is sequentially reflected by the reflecting mirrors I R:! To I R 4 of the illumination optical system, and illuminates the illumination area of the mask M.
- the X-rays reflected by the pattern formed on the mask M are sequentially reflected by the reflecting mirrors PR 1 to PR 4 of the projection optical system, and form an image of the pattern on the wafer W surface.
- Xe plasma using Xe gas or liquefied Xe as a target substance is used as EUV light source of wavelength 13.5 nm used in EUV exposure equipment. What is used is widely researched and developed. The reason is that a relatively high conversion efficiency (ratio of EUV light intensity obtained with respect to input energy) can be obtained, and Xe is a gas material at room temperature, so the problem of debris (scattered particles) is less likely to occur. is there.
- the present invention has been made in view of such circumstances, and it is possible to suppress high-density plasma due to the use of a solid target such as Sn and to have high EUV light conversion efficiency.
- the first object is to provide an EUV light source, an EUV exposure apparatus using this EUV light source, and a method for manufacturing a semiconductor device using this EUV exposure apparatus.
- EUV light source that can reduce debris, and EU V light source using this EUV light source A second object is to provide an exposure apparatus and, moreover, a semiconductor device manufacturing method using this EUV exposure apparatus.
- a first means for achieving the above object is a plasma EUV light source that generates plasma from a target and emits EUV light generated from the plasma, and the target is a solid-state dispersed in a medium.
- Target EUV light source characterized by fine particles.
- the solid target such as Sn which is turned into plasma by being irradiated with an excitation laser or being discharged, is arranged in the form of fine particles dispersed in the medium. It can prevent the density from becoming too high. In addition, since it is distributed in the medium, it is possible to reduce the target material that becomes debris without plasma, and the amount of debris can be reduced.
- EUV light having a peak in the vicinity of 13.4 nm can be generated.
- Higher intensity EUV light can be used for the equipment used.
- the medium is preferably a liquid.
- the medium is preferably a liquid obtained by heating and melting a plastic resin, and the plastic resin is also preferably a thermoplastic resin. It is also preferable to have a nozzle that ejects these liquid media. When heated and melted liquid plastic resin is ejected from the nozzle, the plastic resin becomes particles due to surface tension, and in some cases, it is cooled to solid particles. In these liquid or solid plastic resin particles, solid fine particles are dispersed and contained. .
- the plastic resin particles are solidified into a substantially spherical shape after the formation, the shape will be stable compared to the liquid droplets, so the direction in which the particles fly will be stable, and the target will be stable where the plasma is generated. Therefore, the output of the light source can be made more stable.
- any known means can be used as the method for converting the target into plasma, and for example, this means can also be applied to the aforementioned discharge plasma EUV light source.
- the liquid is preferably solidified after being ejected from the nozzle.
- the target is liquid until it is ejected from the nozzle, but then solidifies, so the shape is stable compared to the target flying in the liquid state, so the target is stably supplied to the place where plasma is generated. Therefore, it becomes possible to further stabilize the output of the light source.
- the solid fine particles are solid, they have a higher density than the Xe gas, which makes it possible to achieve high conversion efficiency.
- a thermoplastic resin When a thermoplastic resin is used, it is easily liquefied by heating, so that it is suitable as a substance containing dispersed solid fine particles.
- the second means for achieving the above object is to irradiate the mask with EUV light from an EUV light source through an illumination optical system, and expose a pattern formed on the mask onto a sensitive substrate such as a wafer by a projection optical system.
- this method uses a plasma EUV light source with high conversion efficiency, it can be used as an EUV light source with a large amount of light, and throughput can be increased.
- the third means for achieving the object has a step of exposing and transferring the pattern formed on the mask onto a sensitive substrate such as a wafer using the EUV exposure apparatus as the second means.
- Semiconductor device manufacturing Is the method. .
- FIG. 1 is a diagram showing an outline of a laser plasma EUV light source as a first example of an embodiment of the present invention.
- FIG. 2 is a diagram showing the relationship between the nozzles for supplying a target, the laser light, and the arrangement of the condenser mirrors in the embodiment of the present invention shown in FIG.
- FIG. 3 is a diagram showing an outline of a discharge plasma EUV light source as a second example of the embodiment of the present invention.
- FIG. 4 is a diagram showing the positional relationship between the target recovery mechanism and the discharge plasma light source in the embodiment of the present invention shown in FIG.
- FIG. 5 is a flowchart showing an example of the semiconductor device manufacturing method of the present invention.
- FIG. 6 is a view showing an outline of the EUV exposure apparatus. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram showing an outline of a laser plasma EUV light source as a first example of an embodiment of the present invention.
- the heated tank 4 contains a liquid in which Sn solid fine particles are dispersed in polystyrene resin. 'The concentration of solid Sn fine particles is, for example, 1 to 10 wt%. The diameter of the Sn solid fine particles is, for example, 50 nm to 200 nm.
- a solution stirring mechanism 5 is provided to prevent precipitation of the Sn solid particles. In this example, the solution stirring mechanism 5 Rotate the roots.
- the tank 4 is connected to the pressurizing pump 6 by piping, and the resin pressurized by the pressurizing pump is guided to the nozzle 1 and is liquid from the tip of the nozzle 1 provided in the vacuum chamber 7. Brew the resin.
- the piping from the tank 4 through the pressure pump 6 to the nozzle 1 is all heated so that the resin does not solidify.
- the liquid liquid spilled from the nozzle 1 becomes a spherical shape due to the surface tension, and is cooled and solidified in a vacuum to become a solid target 2.
- the temperature, viscosity, pressurizing pressure, nozzle 1 diameter, etc. of the molten resin are set so that target 2 of a certain size is supplied at regular time intervals.
- the diameter of the target 2 is set to about 50 to 200 ⁇ m.
- Target 2 is preferably matched to the amount of target consumed by being converted into plasma, such as by one-pulse laser irradiation. If the target is too large, the remainder that has not been converted to plasma will cause debris, which is undesirable. Conversely, if the target is too small, the conversion efficiency is lowered, which is not preferable.
- the vacuum chamber 7 is provided with a laser introduction window 10 for introducing laser light.
- the laser light generated from the N d: YAG laser light source 8 arranged outside the vacuum chamber 7 is condensed by the lens 9. Then, it is guided into the vacuum chamber 7.
- Each component is placed so that target 2 passes through the laser focusing point position, and the target is irradiated so that the laser pulse is emitted when target 2 is just at the focusing point position.
- the laser supply and laser pulse are controlled synchronously. That is, the position of the target 2 is monitored by a monitor mechanism (not shown), and when the target 2 comes to the condensing point position of the laser, the Nd: YAG laser light source 8 is triggered to emit light. become Let's go.
- the target 2 irradiated with the laser is turned into plasma and emits light including EUV light.
- the condensing mirror 1 1 collects EUV light generated from the plasma and guides it to the illumination optical system (not shown).
- the condensing mirror 11 has a spheroidal reflecting surface, and the reflecting surface is coated with a Mo / Si multilayer film.
- One focal position of the spheroid is the laser condensing point position, that is, the EUV light generation position. Therefore, the light reflected by the condensing mirror 11 is condensed at another focal position and then guided to the illumination optical system.
- target recovery mechanism 3 The residue of target 2 that has not been converted to plasma is recovered by target recovery mechanism 3.
- the collected target residue is returned to tank 4, where it is heated and melted again for reuse.
- a backflow prevention mechanism (not shown) is provided between the target recovery mechanism 3 and the tank 4 to prevent the steam in the tank from flowing back into the vacuum chamber 17.
- FIG. 3 is a diagram showing an outline of a discharge plasma EUV light source as a second example of the embodiment of the present invention.
- the same components as those in the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof is omitted.
- the target 2 matches the amount of the target that is converted into plasma and consumed in one discharge.
- Target 2 ejected from nozzle 1 is a Z-pinch discharge plasma light source 2 Guided to the discharge space in 7.
- the Z-pinch discharge plasma light source 2 7 is composed of a disc-shaped electrode (anode) 2 1 with a hole, an electrode (cathode) 2 3 of the same shape, and a cylindrical insulator 2 2 that connects the two.
- a high voltage pulse is applied between the electrode (anode) 2 1 and the electrode (cathode) 2 3
- the material in the space between them is turned into plasma by discharge, and light containing EUV light is emitted.
- Each component is arranged so that target 2 passes through the discharge space, and the target supply and the target voltage are applied so that a high voltage pulse is applied when target 2 reaches the center of the discharge space. High voltage pulses are controlled synchronously.
- the nozzle 1 is provided with a vibration mechanism (not shown), and the liquid ejection timing can be controlled by applying vibration in the liquid ejection direction of the nozzle 1.
- the excitation to nozzle 1 and the trigger to the high voltage power source are controlled so that the above synchronization can be achieved.
- the condensing optical system 26 condenses EUV light generated from the plasma and guides it to the illumination optical system (not shown).
- the condensing optical system 26 is a Schwartsill optical system composed of two concentric spherical reflecting surfaces 24, 25, and the reflecting surface is coated with a Mo ZSi multilayer film. .
- Residues remaining on the target 2 without being converted to plasma are recovered by the target recovery mechanism 3.
- the collected target residue is returned to tank 4, where it is heated and melted again for reuse.
- a backflow prevention mechanism (not shown) is provided between the target recovery mechanism 3 and the tank 4 to prevent the steam in the tank from flowing back into the vacuum chamber 7.
- the positional relationship between the target recovery mechanism 3 and the discharge plasma light source 27 is as shown in Fig. 4, and the central axis of the hole of the electrode 23 and the central axis of the opening of the target recovery mechanism 3 are almost the same. Are arranged as follows.
- Target recovery mechanism 3 uses EUV light generated from discharge plasma light source 27. Shield part of. Since the Schwarssill optical system used for the condensing optical system 26 is an optical system with a central shield, it cannot originally condense light rays near the optical axis. In the present embodiment, the target recovery mechanism 3 is disposed as much as possible in the center shield of the shuprusschild optical system to prevent EUV light loss due to kicking to a minimum.
- polystyrene resin is used as the resin, but the plastic resin to be used is not limited to this.
- other thermoplastic resins such as chlorinated resin, ABS resin, methacrylic resin, polyethylene resin, polypropylene resin, polyamide resin, polyacetal resin, and polycarbonate resin are used. May be.
- Sn is used as the solid particulate material
- other solid materials may be used. If the temperature required to heat and liquefy the resin becomes higher than the melting point of Sn, tin oxide (such as Sn02) can be used instead of Sn. 1 If you want to generate EUV light or X-rays with wavelengths other than near 5 nm, solid materials suitable for that wavelength other than Sn can be used as appropriate.
- FIG. 5 is a flowchart showing an example of the semiconductor device manufacturing method of the present invention.
- the manufacturing process of this example includes the following main processes.
- Wafer manufacturing process for manufacturing wafers or wafer preparation process for preparing wafers
- Chip assembly process that cuts out chips formed on the wafer one by one and makes them operable
- Each process consists of several sub-processes.
- the main process that has a decisive influence on the performance of semiconductor devices is the wafer processing process.
- the designed circuit patterns are sequentially stacked on the wafer to form a large number of chips that operate as memory and MPU.
- This woofer processing process includes the following steps.
- a lithography process that forms a resist pattern using a mask (reticle) to selectively process thin film layers, wafer substrates, etc.
- the wafer processing process is repeated for the required number of layers to produce semiconductor devices that operate as designed.
- the EUV exposure apparatus according to the embodiment of the present invention is used in one lithography process. Therefore, a fine line width pattern can be exposed, and at the same time, exposure can be performed with high throughput, and a semiconductor device can be manufactured efficiently.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Nanotechnology (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
- X-Ray Techniques (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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KR1020067023544A KR101172924B1 (ko) | 2004-06-24 | 2005-06-22 | Euv 광원, euv 노광 장치 및 반도체 장치의 제조방법 |
EP05755689A EP1775756B1 (en) | 2004-06-24 | 2005-06-22 | Euv light source, euv exposure equipment and semiconductor device manufacturing method |
US11/629,535 US7741616B2 (en) | 2004-06-24 | 2005-06-22 | EUV light source, EUV exposure equipment, and semiconductor device manufacturing method |
AT05755689T ATE525678T1 (de) | 2004-06-24 | 2005-06-22 | Euv-lichtquelle, euv-belichtungsanlage und verfahren zur herstellung einer halbleitervorrichtung |
JP2006528720A JP4683231B2 (ja) | 2004-06-24 | 2005-06-22 | Euv光源、euv露光装置、及び半導体デバイスの製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004186133 | 2004-06-24 | ||
JP2004-186133 | 2004-06-24 |
Publications (1)
Publication Number | Publication Date |
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WO2006001459A1 true WO2006001459A1 (ja) | 2006-01-05 |
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ID=35781885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/011865 WO2006001459A1 (ja) | 2004-06-24 | 2005-06-22 | Euv光源、euv露光装置、及び半導体デバイスの製造方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US7741616B2 (ja) |
EP (1) | EP1775756B1 (ja) |
JP (1) | JP4683231B2 (ja) |
KR (1) | KR101172924B1 (ja) |
CN (1) | CN100485864C (ja) |
AT (1) | ATE525678T1 (ja) |
WO (1) | WO2006001459A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006017904A1 (de) * | 2006-04-13 | 2007-10-18 | Xtreme Technologies Gmbh | Anordnung zur Erzeugung von extrem ultravioletter Strahlung aus einem energiestrahlerzeugten Plasma mit hoher Konversionseffizienz und minimaler Kontamination |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7838853B2 (en) * | 2006-12-14 | 2010-11-23 | Asml Netherlands B.V. | Plasma radiation source, method of forming plasma radiation, apparatus for projecting a pattern from a patterning device onto a substrate and device manufacturing method |
JP5155017B2 (ja) | 2008-05-29 | 2013-02-27 | ルネサスエレクトロニクス株式会社 | 半導体集積回路装置の製造方法 |
US8993976B2 (en) * | 2011-08-19 | 2015-03-31 | Asml Netherlands B.V. | Energy sensors for light beam alignment |
CN103042221B (zh) * | 2012-12-14 | 2015-04-15 | 华中科技大学 | 一种用于极紫外光源的高熔点材料液滴靶产生装置 |
CN103079327B (zh) * | 2013-01-05 | 2015-09-09 | 中国科学院微电子研究所 | 一种靶源预整形增强的极紫外光发生装置 |
CN103105740B (zh) * | 2013-01-16 | 2015-03-18 | 华中科技大学 | 基于固体液体组合靶材的极紫外光源产生装置及光源系统 |
US10499485B2 (en) * | 2017-06-20 | 2019-12-03 | Asml Netherlands B.V. | Supply system for an extreme ultraviolet light source |
TWI647977B (zh) * | 2017-08-24 | 2019-01-11 | 台灣積體電路製造股份有限公司 | 極紫外光微影設備、標靶材料供應系統與方法 |
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2005
- 2005-06-22 US US11/629,535 patent/US7741616B2/en active Active
- 2005-06-22 AT AT05755689T patent/ATE525678T1/de not_active IP Right Cessation
- 2005-06-22 EP EP05755689A patent/EP1775756B1/en active Active
- 2005-06-22 KR KR1020067023544A patent/KR101172924B1/ko active IP Right Grant
- 2005-06-22 CN CNB2005800200100A patent/CN100485864C/zh not_active Expired - Fee Related
- 2005-06-22 JP JP2006528720A patent/JP4683231B2/ja active Active
- 2005-06-22 WO PCT/JP2005/011865 patent/WO2006001459A1/ja active Application Filing
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---|---|---|---|---|
DE102006017904A1 (de) * | 2006-04-13 | 2007-10-18 | Xtreme Technologies Gmbh | Anordnung zur Erzeugung von extrem ultravioletter Strahlung aus einem energiestrahlerzeugten Plasma mit hoher Konversionseffizienz und minimaler Kontamination |
DE102006017904B4 (de) * | 2006-04-13 | 2008-07-03 | Xtreme Technologies Gmbh | Anordnung zur Erzeugung von extrem ultravioletter Strahlung aus einem energiestrahlerzeugten Plasma mit hoher Konversionseffizienz und minimaler Kontamination |
Also Published As
Publication number | Publication date |
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US20080068575A1 (en) | 2008-03-20 |
JPWO2006001459A1 (ja) | 2008-04-17 |
US7741616B2 (en) | 2010-06-22 |
KR20070023694A (ko) | 2007-02-28 |
JP4683231B2 (ja) | 2011-05-18 |
ATE525678T1 (de) | 2011-10-15 |
EP1775756B1 (en) | 2011-09-21 |
EP1775756A1 (en) | 2007-04-18 |
CN1969372A (zh) | 2007-05-23 |
CN100485864C (zh) | 2009-05-06 |
KR101172924B1 (ko) | 2012-08-14 |
EP1775756A4 (en) | 2008-08-06 |
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