WO2010091907A1 - Multilayer mirror and lithographic apparatus - Google Patents

Multilayer mirror and lithographic apparatus Download PDF

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Publication number
WO2010091907A1
WO2010091907A1 PCT/EP2010/050195 EP2010050195W WO2010091907A1 WO 2010091907 A1 WO2010091907 A1 WO 2010091907A1 EP 2010050195 W EP2010050195 W EP 2010050195W WO 2010091907 A1 WO2010091907 A1 WO 2010091907A1
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WO
WIPO (PCT)
Prior art keywords
layers
layer
compound
multilayer mirror
interlayer
Prior art date
Application number
PCT/EP2010/050195
Other languages
French (fr)
Inventor
Denis Glushkov
Vadim Banine
Leonid Sjmaenok
Nikolai Salaschenko
Nikolay Chkhalo
Original Assignee
Asml Netherlands B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asml Netherlands B.V. filed Critical Asml Netherlands B.V.
Priority to EP10700234A priority Critical patent/EP2396794A1/en
Priority to JP2011549498A priority patent/JP5568098B2/en
Priority to SG2011055241A priority patent/SG174126A1/en
Priority to US13/201,242 priority patent/US9082521B2/en
Priority to CN201080007169XA priority patent/CN102318010A/en
Priority to KR1020117018022A priority patent/KR101694283B1/en
Publication of WO2010091907A1 publication Critical patent/WO2010091907A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
    • H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
    • H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
    • 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
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/06—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction or reflection, e.g. monochromators
    • G21K1/062—Devices having a multilayer structure
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
    • G02B5/085—Multilayer mirrors, i.e. having two or more reflecting layers at least one of the reflecting layers comprising metal
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0891—Ultraviolet [UV] mirrors
    • 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
    • G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
    • G03F1/22—Masks or mask blanks for imaging by radiation of 100nm or shorter wavelength, e.g. X-ray masks, extreme ultraviolet [EUV] masks; Preparation thereof
    • G03F1/24—Reflection masks; Preparation thereof
    • 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
    • G03F7/70216—Mask projection systems
    • G03F7/70316—Details of optical elements, e.g. of Bragg reflectors, extreme ultraviolet [EUV] multilayer or bilayer mirrors or diffractive optical elements
    • 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
    • G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
    • G03F7/70908—Hygiene, e.g. preventing apparatus pollution, mitigating effect of pollution or removing pollutants from apparatus
    • G03F7/70941—Stray fields and charges, e.g. stray light, scattered light, flare, transmission loss
    • 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
    • G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
    • G03F7/7095—Materials, e.g. materials for housing, stage or other support having particular properties, e.g. weight, strength, conductivity, thermal expansion coefficient
    • G03F7/70958—Optical materials or coatings, e.g. with particular transmittance, reflectance or anti-reflection properties

Definitions

  • the present invention relates to a multilayer mirror and a lithographic apparatus that includes such a multilayer mirror.
  • a lithographic apparatus is a machine that applies a desired pattern onto a substrate, usually onto a target portion of the substrate.
  • a lithographic apparatus can be used, for example, in the manufacture of integrated circuits (ICs).
  • a patterning device which is alternatively referred to as a mask or a reticle, may be used to generate a circuit pattern to be formed on an individual layer of the IC. This pattern can be transferred onto a target portion
  • a substrate e.g. a silicon wafer
  • Transfer of the pattern is typically via imaging onto a layer of radiation-sensitive material (resist) provided on the substrate.
  • a single substrate will contain a network of adjacent target portions that are successively patterned.
  • Lithography is widely recognized as one of the key steps in the manufacture of ICs and other devices and/or structures. However, as the dimensions of features made using lithography become smaller, lithography is becoming a more critical factor for enabling miniature IC or other devices and/or structures to be manufactured.
  • a lithographic apparatus typically includes an illumination system configured to condition a radiation beam; a support structure constructed to hold a patterning device, mostly a reticle or mask, the patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table constructed to hold a substrate; and a projection system configured to project the patterned radiation beam onto a target portion of the substrate.
  • a patterning device mostly a reticle or mask, the patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam
  • a substrate table constructed to hold a substrate
  • a projection system configured to project the patterned radiation beam onto a target portion of the substrate.
  • ⁇ is the wavelength of the radiation used
  • NAps is the numerical aperture of the projection system used to print the pattern
  • ki is a process dependent adjustment factor, also called the Rayleigh constant
  • CD is the feature size (or critical dimension) of the printed feature. It follows from equation (1) that reduction of the minimum printable size of features can be obtained in three ways: by shortening the exposure wavelength ⁇ , by increasing the numerical aperture NAps, or by decreasing the value of Ic 1 .
  • EUV radiation sources are configured to output a radiation wavelength of about 13.5 nm.
  • EUV radiation sources may constitute a significant step toward achieving small features printing.
  • Such radiation is termed extreme ultraviolet or soft x-ray, and possible sources include, for example, laser-produced plasma sources, discharge plasma sources, or synchrotron radiation from electron storage rings.
  • both the illumination system and the projection system include a plurality of optical elements in order to focus the radiation on the desired locations on the patterning device and the substrate, respectively.
  • the illumination system and the projection system preferably include mirrors.
  • the patterning device is preferably a reflective device, i.e. a mirror having a reflective surface provided with an pattern formed by an absorptive material on the reflective surface, for the same reason.
  • multilayer mirrors To reflect EUV radiation having a wavelength of about 6.9 nm, multilayer mirrors have been proposed having alternating layers of a metal, such as La, U or Th, and B or a B compound, such as B 4 C or BgC. Such a multilayer mirror reflects the EUV radiation according to Bragg's Law. However, chemical interaction of for instance La and the B layer or the B compound layer leads to interlayer diffusion.
  • a mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm, preferably having a wavelength in the range of 6.4nm-7.2nm.
  • the multilayer mirror has alternating layers.
  • the alternating layers include a first layer and a second layer.
  • the first and second layers are selected from the group consisting of: La and B 4 C layers, U and B 4 C layers, Th and B 4 C layers, La and BgC layers U and BgC layers, Th and BgC layers, La and B layers, U and B layers, C and B layers, Th and B layers, U compound and B 4 C layers, Th compound and B 4 C layers, La compound and BgC layers, La compound and a B 4 C layers, U compound and a BgC layers, Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the first layers is separated from a second layer by an interlayer disposed between the at least one of the first layers and the second layer.
  • each of the layers of a plurality of the layers is separated from each of the second layers by an interlayer.
  • the interlayer may be selected from the group consisting of: a Sn layer, a Mo layer, and a Cr layer.
  • the first layer may be a U compound layer which comprises one or more from the group consisting of UF 3 , UF 4 , UF 5 , UCl 3 , UCl 4 , UCl 5 , UI 3 , UI 4 , UO, UO 2 , UO 3 , U 3 O 8 , U 2 O 5 , U 3 O 7 , U 4 O 9 , UTe 2 , UTe 3 , UN, U 2 N 3 , and U 3 N 2 .
  • the first layer may be a Th compound layer which comprises one or more from the group consisting OfThF 3 , ThF 4 , ThCl 4 , ThI 2 , ThI 3 , ThI 4 , ThH 2 , ThO 2 , ThSe 2 , and ThN.
  • the first layer is a La compound layer which comprises one or more from the group consisting of LaH 2 , LaH 3 , LaF 3 , LaCl 3 , LaI 3 , La 2 O 3 , LaSe, and LaTe.
  • the mirror may be comprised in a projection system configured to project a patterned radiation beam onto a target portion of a substrate or the mirror may be comprised in an illumination system configured to condition a radiation beam.
  • the projection system and/or the illumination system are comprised in a lithographic apparatus further comprising a support structure constructed to hold a patterning device, the patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam, and a substrate table constructed to hold a substrate.
  • a projection system configured to project a patterned radiation beam onto a target portion of a substrate.
  • the projection system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of 6.2-7.2 nm.
  • the multilayer mirror has alternating layers.
  • the alternating layers include a first layer and a second layer.
  • the first and second layers are selected from the group consisting of: U and B 4 C layers, Th and B 4 C layers, La and BgC layers U and BgC layers, Th and BgC layers, La and B layers, U and B layers, Th and B layers, U compound and B 4 C layers, Th compound and B 4 C layers, La compound and B 9 C layers, La compound and a B 4 C layers, U compound and a BgC layers, Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the the first layers is separated from a second layer by an interlayer disposed between the at least one of the first layers and the second layer.
  • each of the layers of a plurality of the layers is separated from each of the second layers by an interlayer.
  • a projection system configured to project a patterned radiation beam onto a target portion of a substrate.
  • the projection system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm.
  • the multilayer mirror has a reflective surface provided with a capping layer that includes Ru, Rh, Ta, Ti, or any combination thereof.
  • an illumination system configured to condition a radiation beam.
  • the illumination system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm.
  • the multilayer mirror has alternating layers.
  • the alternating layers include a first layer and a second layer.
  • the first and second layers are selected from the group consisting of: U and B 4 C layers, Th and B 4 C layers, La and BgC layers U and BgC layers, Th and BgC layers, La and B layers, U and B layers, Th and B layers, U compound and B 4 C layers, Th compound and B 4 C layers, La compound and BgC layers, La compound and a B 4 C layers, U compound and a BgC layers, Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the the first layers is separated from a second layer by an interlayer disposed between the at least one of the first layers and the second layer.
  • each of the layers of a plurality of the layers is separated from each of the second layers by an interlayer.
  • an illumination system configured to condition a radiation beam.
  • the illumination system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm.
  • the multilayer mirror has a reflective surface provided with a capping layer that includes Ru, Rh, Ta, Ti, or any combination thereof.
  • a lithographic projection apparatus arranged to project a pattern from a patterning device onto a substrate.
  • the lithographic apparatus includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm.
  • the multilayer mirror has alternating layers.
  • the alternating layers include a first layer and a second layer.
  • the first and second layers are selected from the group consisting of: U and B 4 C layers, Th and B 4 C layers, La and BgC layers U and BgC layers, Th and BgC layers, La and B layers, U and B layers, Th and B layers, U compound and B 4 C layers, Th compound and B 4 C layers, La compound and BgC layers, La compound and a B 4 C layers, U compound and a BgC layers, Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the the first layers is separated from a second layer by an inter
  • a lithographic projection apparatus arranged to project a pattern from a patterning device onto a substrate.
  • the lithographic apparatus includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm.
  • the multilayer mirror has a reflective surface provided with a capping layer that includes Ru, Rh, Ta, Ti, or any combination thereof.
  • a lithographic apparatus that includes an illumination system configured to condition a radiation beam, and a support structure constructed to hold a patterning device.
  • the patterning device is capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam.
  • the apparatus also includes a substrate table constructed to hold a substrate, and a projection system configured to project the patterned radiation beam onto a target portion of the substrate.
  • the illumination system and/or the projection system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm.
  • the multilayer mirror has alternating layers.
  • the alternating layers include a first layer and a second layer.
  • the first and second layers are selected from the group consisting of: U and B 4 C layers, Th and B 4 C layers, La and BgC layers U and BgC layers, Th and BgC layers, La and B layers, U and B layers, Th and B layers, U compound and B 4 C layers, Th compound and B 4 C layers, La compound and BgC layers, La compound and a B 4 C layers, U compound and a BgC layers, Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the the first layers is separated from a second layer by an interlayer disposed between the at least one of the first layers and the second layer.
  • each of the layers of a plurality of the layers is separated from each of the second layers by an interlayer.
  • Each first layer of a plurality of first layers may be separated from a second layer by an interlayer.
  • the interlayer may be selected from the group consisting of: a Sn layer, a Mo layer, a Cr layer, a Sn compound layer, a Mo compound layer, and a Cr compound layer.
  • the interlay er may selected from the group consisting of: a Sn layer, a Mo layer, a Cr layer, a Sn compound layer, a Mo compound layer, and a Cr compound layer.
  • the Sn compound may include at least one of the group consisting Of SnF 2 , SnF 4 , SnCl 2 , SnCl 4 , SnI 2 , SnI 4 , SnO, SnO 2 , SnSe, SnSe 2 , and SnTe.
  • the Cr compound may include at least one OfCrF 2 , CrF 3 , CrF 4 , CrCl 2 , CrCl 3 , CrCl 4 , CrI 2 , CrI 3 , CrI 4 , CrO 2 , CrO 3 , Cr 2 O 3 , Cr 3 O 4 , CrN, CrSe, and Cr 2 Te 3 .
  • the Mo compound may include at least one of the group consisting OfMoF 3 , MoF 4 , MoCl 2 , MoCl 3 , MoCl 4 , MoI 2 , MoI 3 , MoI 4 , MoO, MoO 2 , MoO 3 , MoSe 2 , MoTe 2 , and MoN.
  • the first layer may be a Th compound layer, wherein the Th compound layer includes one or more from the group consisting OfThF 3 , ThF 4 , ThCl 4 , ThI 2 , ThI 3 , ThI 4 , ThH 2 , ThO 2 , ThSe 2 , and ThN.
  • the first layer may be a U compound layer, wherein the U compound layer includes one or more from the group consisting of UF 3 , UF 4 , UF5, UCl 3 , UCl 4 , UCl 5 , UI 3 , UI 4 , UO, UO 2 , UO 3 , U 3 O 8 , U 2 O 5 , U 3 O 7 , U 4 O 9 , UTe 2 , UTe 3 , UN, U 2 N 3 , and U 3 N 2 .
  • the U compound layer includes one or more from the group consisting of UF 3 , UF 4 , UF5, UCl 3 , UCl 4 , UCl 5 , UI 3 , UI 4 , UO, UO 2 , UO 3 , U 3 O 8 , U 2 O 5 , U 3 O 7 , U 4 O 9 , UTe 2 , UTe 3 , UN, U 2 N 3 , and U 3 N 2 .
  • the first layer may be a La compound layer, wherein the La compound layer includes one or more from the group consisting OfLaH 2 , LaH 3 , LaF 3 , LaCl 3 , LaI 3 , La 2 O 3 , LaSe, and LaTe.
  • a lithographic apparatus that includes an illumination system configured to condition a radiation beam, and a support structure constructed to hold a patterning device.
  • the patterning device is capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam.
  • the apparatus also includes a substrate table constructed to hold a substrate, and a projection system configured to project the patterned radiation beam onto a target portion of the substrate.
  • the illumination system and/or the projection system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of 2-8 nm.
  • the multilayer mirror has a reflective surface provided with a capping layer that includes Ru, Rh, Ta, Ti, or any combination thereof.
  • Figure 2 schematically depicts a side view of an EUV illumination system and projection system of the lithographic projection apparatus of Figure 1;
  • Figure 3 schematically depicts a multilayer mirror of the lithographic apparatus of
  • FIG. 1 according to an embodiment of the present invention
  • Figures 4a, 4b, and 4c depict reflectance of embodiments of the multilayer mirror of
  • Figure 5 depicts an embodiment of the multilayer mirror of the lithographic apparatus of Figure 1;
  • Figure 6 depicts an embodiment of the multilayer mirror of the lithographic apparatus of Figure 1;
  • Figure 7 depicts an embodiment of the multilayer mirror of the lithographic apparatus of Figure 1.
  • FIG. 1 schematically depicts a lithographic apparatus according to an embodiment of the invention.
  • the apparatus includes: an illumination system (illuminator) IL configured to condition a radiation beam B (e.g. EUV radiation); a patterning device support or support structure (e.g. a mask table) MT constructed to support a patterning device (e.g. a mask or a reticle) MA and connected to a first positioner PM configured to accurately position the patterning device; a substrate table (e.g. a wafer table) WT constructed to hold a substrate (e.g. a resist-coated wafer) W and connected to a second positioner PW configured to accurately position the substrate; and a projection system (e.g. a reflective projection lens system) PS configured to project a pattern imparted to the radiation beam B by patterning device MA onto a target portion C (e.g. including one or more dies) of the substrate W.
  • a radiation beam B e.g. EUV radiation
  • the illumination system may include various types of optical components, such as refractive, reflective, magnetic, electromagnetic, electrostatic or other types of optical components, or any combination thereof, to direct, shape, or control radiation.
  • optical components which are configured to condition the radiation beam B are preferably reflective components.
  • the support structure holds the patterning device in a manner that depends on the orientation of the patterning device, the design of the lithographic apparatus, and other conditions, such as for example whether or not the patterning device is held in a vacuum environment.
  • the support structure can use mechanical, vacuum, electrostatic or other clamping techniques to hold the patterning device.
  • the support structure may be a frame or a table, for example, which may be fixed or movable as desired. The support structure may ensure that the patterning device is at a desired position, for example with respect to the projection system.
  • patterning device should be broadly interpreted as referring to any device that can be used to impart a radiation beam with a pattern in its cross-section such as to create a pattern in a target portion of the substrate.
  • the pattern imparted to the radiation beam may correspond to a particular functional layer in a device being created in the target portion, such as an integrated circuit.
  • the patterning device may be transmissive, but is preferably reflective.
  • Examples of patterning devices include masks, programmable mirror arrays, and programmable LCD panels.
  • Masks are well known in lithography, and include mask types such as binary, alternating phase-shift, and attenuated phase-shift, as well as various hybrid mask types.
  • An example of a programmable mirror array employs a matrix arrangement of small mirrors, each of which can be individually tilted so as to reflect an incoming radiation beam in different directions. The tilted mirrors impart a pattern in a radiation beam which is reflected by the mirror matrix.
  • projection system may encompass any type of projection system, including refractive, reflective, catadioptric, magnetic, electromagnetic and electrostatic optical systems, or any combination thereof, as appropriate for the exposure radiation being used, or for other factors, especially the use of a vacuum. It may be desired to use a vacuum for
  • EUV or electron beam radiation since other gases may absorb too much radiation or electrons.
  • a vacuum environment may therefore be provided to the whole beam path with the aid of a vacuum wall and vacuum pumps.
  • the apparatus is of a reflective type (e.g. employing a reflective mask).
  • the apparatus may be of a transmissive type (e.g. employing a transmissive mask).
  • the lithographic apparatus may be of a type having two (dual stage) or more substrate tables (and/or two or more mask tables). In such "multiple stage” machines the additional tables may be used in parallel, or preparatory steps may be carried out on one or more tables while one or more other tables are being used for exposure.
  • the illuminator IL receives a radiation beam from a radiation source SO.
  • the source and the lithographic apparatus may be separate entities, for example when the source is an excimer laser. In such cases, the source is not considered to form part of the lithographic apparatus and the radiation beam is passed from the source SO to the illuminator IL with the aid of a beam delivery system including, for example, suitable directing mirrors and/or a beam expander. In other cases the source may be an integral part of the lithographic apparatus, for example when the source is a mercury lamp.
  • the source SO and the illuminator IL, together with the beam delivery system if desired, may be referred to as a radiation system.
  • the illuminator IL may include an adjuster to adjust the angular intensity distribution of the radiation beam. Generally, at least the outer and/or inner radial extent (commonly referred to as ⁇ -outer and ⁇ -inner, respectively) of the intensity distribution in a pupil plane of the illuminator can be adjusted.
  • the illuminator IL may include various other components, such as an integrator and a condenser. The illuminator may be used to condition the radiation beam, to have a desired uniformity and intensity distribution in its cross-section.
  • the radiation beam B is incident on the patterning device (e.g., mask) MA, which is held on the support structure (e.g., mask table) MT, and is patterned by the patterning device. After being reflected from the patterning device (e.g. mask) MA, the radiation beam B passes through the projection system PS, which focuses the beam onto a target portion C of the substrate W.
  • the substrate table WT can be moved accurately, e.g. so as to position different target portions C in the path of the radiation beam B.
  • the first positioner PM and another position sensor IFl can be used to accurately position the patterning device (e.g. mask) MA with respect to the path of the radiation beam B.
  • Patterning device (e.g. mask) MA and substrate W may be aligned using patterning device alignment marks Ml, M2 and substrate alignment marks Pl, P2.
  • the depicted apparatus could be used in at least one of the following modes: [0044] 1. In step mode, the support structure (e.g. mask table) MT and the substrate table WT are kept essentially stationary, while an entire pattern imparted to the radiation beam is projected onto a target portion C at one time (i.e. a single static exposure). The substrate table WT is then shifted in the X and/or Y direction so that a different target portion C can be exposed.
  • the support structure (e.g. mask table) MT and the substrate table WT are scanned synchronously while a pattern imparted to the radiation beam is projected onto a target portion C (i.e. a single dynamic exposure).
  • the velocity and direction of the substrate table WT relative to the support structure (e.g. mask table) MT may be determined by the (de-)magnification and image reversal characteristics of the projection system PS.
  • the support structure (e.g. mask table) MT is kept essentially stationary holding a programmable patterning device, and the substrate table WT is moved or scanned while a pattern imparted to the radiation beam is projected onto a target portion C.
  • a pulsed radiation source is employed and the programmable patterning device is updated as desired after each movement of the substrate table WT or in between successive radiation pulses during a scan.
  • This mode of operation can be readily applied to maskless lithography that utilizes programmable patterning device, such as a programmable mirror array of a type as referred to above.
  • Figure 2 shows the lithographic apparatus of Figure 1 in more detail, including a radiation system 42, an illumination optics unit 44, and the projection system PS.
  • the radiation system 42 includes the radiation source SO which may be formed by a discharge plasma.
  • EUV radiation may be produced by a gas or vapor, for example Xe gas, Li vapor or Sn vapor in which a very hot plasma is created to emit radiation in the EUV range of the electromagnetic spectrum.
  • the very hot plasma is created by causing an at least partially ionized plasma by, for example, an electrical discharge. Partial pressures of, for example, 10 Pa of Xe, Li, Sn vapor or any other suitable gas or vapor may be desired for efficient generation of the radiation.
  • the radiation emitted by radiation source SO is passed from a source chamber 47 into a collector chamber 48 via a gas barrier or contaminant trap 49 which is positioned in or behind an opening in source chamber 47.
  • the gas barrier 49 may include a channel structure.
  • the collector chamber 48 includes a radiation collector 50 which may be formed by a grazing incidence collector. Radiation collector 50 has an upstream radiation collector side 50a and a downstream radiation collector side 50b. Radiation passed by collector 50 can be reflected off a grating spectral filter 51 to be focused in a virtual source point 52 at an aperture in the collector chamber 48.
  • a beam of radiation 56 is reflected in illumination optics unit 44 via normal incidence reflectors 53, 54 onto a reticle or mask positioned on reticle or mask table MT.
  • a patterned beam 57 is formed which is imaged in projection system PS via reflective elements 58, 59 onto wafer stage or substrate table WT. More elements than shown may generally be present in illumination optics unit 44 and projection system PS.
  • Grating spectral filter 51 may optionally be present, depending upon the type of lithographic apparatus. Further, there may be more mirrors present than those shown in the Figures, for example there may be 1-4 more reflective elements present than 58, 59.
  • Radiation collectors 50 are known from the prior art.
  • the collector 50 may be a nested collector with reflectors 142, 143, and 146.
  • a space 180 is provided between two reflectors, e.g. between reflectors 142 and 143.
  • Figure 3 depicts an embodiment of a multilayer mirror 1.
  • the multilayer mirror 1 is constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm.
  • the multilayer mirror includes a layered structure 2 which has alternating layers 4, 6 supported by a substrate 8.
  • the multilayer mirror may be located in various parts of the lithographic apparatus, such as the projection system and the illumination system.
  • the alternating layers 4, 6 may be selected from the group consisting of: La and B 4 C layers, U and B4C layers, Th and B4C layers, La and B9C layers U and B9C layers, Th and B9C layers, La and B layers, U and B layers, and Th and B layers.
  • the alternating layers 4, 6 may be selected from the group consisting of: U and B4C layers, Th and B4C layers, U and B9C layers, Th and B9C layers, U and B layers, Th and B layers U compound and B4C layers, Th compound and B4C layers, La compound and B9C layers, La compound and a B4C layers, U compound and a B9C layers, Th compound and a B9C layers, La compound and a B layers, U compound and B layers, and Th compound and a B9C layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers.
  • U compounds are UF 3 , UF 4 , UF 5 , UCI3, UCl 4 , UCl 5 , UI 3 , UI 4 , UO, UO 2 , UO 3 , U 3 O 8 , U 2 O 5 , U 3 O 7 , U 4 O 9 , UTe 2 , UTe 3 , UN, U 2 N 3 , and U 3 N 2 .
  • suitable Th compounds are ThF 3 , ThF 4 , ThCl 4 , ThI 2 , ThI 3 , ThI 4 , ThH 2 , ThO 2 , ThSe 2 , and ThN.
  • suitable La compounds are LaH 2 , LaH 3 , LaF 3 , LaCl 3 , LaI 3 , La 2 O 3 , LaSe, and LaTe.
  • a potential benefit of such alternating layers is that U layers or Th layers instead of La layers will provide a broad bandwidth, both in terms of angle as well as wavelength.
  • the broad angle bandwidth will allow for a good amount of design freedom, making the multilayer mirror useful for optics in EUV lithography at 6.6 nm wavelength. Also, it may allow for a pupil of an optical system in which the multilayer mirror is included to be homogeneously filled in terms of intensity and allows for a larger numerical aperture (NA).
  • NA numerical aperture
  • Such an interlayer may have a thickness between about 0.2nm and about lnm.
  • each of the first layers 4 is separated from each of the second layers 6 by such an interlayer 7.
  • the interlayer 7 may be a Sn layer, a Mo layer, or a Cr layer.
  • the inter layer may be a Sn compound, such as SnF 2 , SnF 4 , SnCl 2 , SnCl 4 , SnI 2 , SnI 4 , SnO, SnO 2 ,
  • a Cr compound such as CrF 2 , CrF 3 , CrF 4 , CrCl 2 , CrCl 3 , CrCl 4 , CrI 2 , CrI 3 ,
  • MoF 4 MoCl 2 , MoCl 3 , MoCl 4 , MoI 2 , MoI 3 , MoI 4 , MoO, MoO 2 , MoO 3 , MoSe 2 , MoTe 2 , or
  • the alternating layers 4, 6 and the interlay ers 7 multilayer mirrors 1 of Figures 3, 5, 6 and 7 can be manufactured by way of deposition techniques such as magnetron sputtering or electron beam sputtering.
  • Figure 4a is a graph showing reflectance R as a function of wavelength ⁇ for alternating layers which are La and B 4 C layers. The so-called full width half maximum
  • FIG. 4b shows reflectance as a function of wavelength ⁇ for alternating layers which are Th and B 4 C layers (Th/B 4 C layers).
  • FWHM is 0.09 nm.
  • Figure 4c shows reflectance as a function of wavelength ⁇ for alternating layers which are Th and B 4 C layers (LVB 4 C layers).
  • the FWHM is 0.15 nm.
  • Th/BgC layers and U/B9C layers or even Th/B layers and U/B layers may be used instead of TbVB 4 C layers and LVB 4 C layers respectively.
  • An increased B purity may allow for better reflectivity, thereby potentially reducing power losses due to absorption of radiation.
  • the alternating layers may be C and B 4 C layers, C and B9C layers, or C and B layers.
  • C is not as active as La and, therefore, in these alternating layers not as much interlayer diffusion may occur as in La/B 4 C layers.
  • a period which may well be the sum of a thickness of the first layer 4 and a thickness of the second layer 6 and two antidiffusion layers 7, may be within the range of 3 -
  • the alternating layers may have a period thickness which is between about 1.7 and about 2.5 times the thickness of the first layer or the second layer.
  • FIG. 5 An embodiment of the multilayer mirror 1 is shown in Figure 5. This embodiment is a reflective reticle.
  • the embodiment of Figure 5 may be provided with a structure having an absorptive material which is arranged to define the pattern on its surface. Suitable materials to be employed as the absorptive material may be Cr, Ti, Si, Ru, Mo, Ta, Al, or any combination thereof.
  • the multilayer structure 2 of the multilayer mirror 1 may be supported by a substrate 8 in order to reduce mechanical vulnerability. Also, it is to be noted that the dotted lines in Figures 3 and 5 indicate an unspecified number of repeating alternating layers 4, 6. Typically, the multilayer structure 2 of the mirror 1 is formed by a number of 30 to 200 periods of alternating layers, i.e. a total number of layers between 60 and 400. Moreover, it should be noted that the Figures are schematic serving merely as illustrations and that they are not scale drawings.
  • FIG. 6 Further embodiments of the multilayer mirror 1 are depicted in Figures 6 and 7.
  • the embodiment of Figure 6 is similar to the embodiment of Figure 3.
  • the layered structure 2 is provided with a capping layer 12.
  • the capping layer 12 may include Ru, Ta, Ti, Rh, or any combination thereof.
  • Such a capping layer may be suitably arranged to protect the layered structure of the multilayer mirror 1 against chemical attack.
  • a suitable thickness for the capping layer may be anywhere within the range of 0.5 to 10 nm.
  • FIG. 7 Another embodiment is depicted in Figure 7.
  • the embodiment of Figure 7 is similar to the embodiment of Figure 4.
  • the layered structure 2 is provided with a capping layer 12.
  • the capping layer 12 may include Ru, and/or Rh and may be suitably arranged to protect the layered structure of the multilayer mirror 1 against chemical attack.
  • an embodiment of the multilayer mirror according to the invention may have interlayers, wherein an interlayer is a Sn layer and a further interlayer is a Mo layer, or wherein an interlayer is a Cr interlayer and a further interlayer is an interlayer containing other suitable material.
  • an Sn interlayer, a further Mo interlayer, and a yet further Cr interlayer may be provided.
  • a multilayer mirror is provided having one or more interlayers, the interlayers including Sn alloys, Mo alloys or Cr alloys.
  • the lithographic apparatus described herein may have other applications, such as the manufacture of integrated optical systems, guidance and detection patterns for magnetic domain memories, flat-panel displays, liquid-crystal displays (LCDs), thin- film magnetic heads, etc.
  • UV radiation e.g. having a wavelength of or about 365, 355, 248, 193, 157 or 126 nm
  • EUV radiation e.g. having a wavelength in the range of 5-20 nm
  • particle beams such as ion beams or electron beams.
  • the invention may take the form of a computer program containing one or more sequences of machine-readable instructions describing a method as disclosed above, or a data storage medium (e.g. semiconductor memory, magnetic or optical disk) having such a computer program stored therein.
  • a data storage medium e.g. semiconductor memory, magnetic or optical disk

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Abstract

A multilayer mirror (7) is constructed and arranged to reflect radiation having a wavelength in the range of 2-8 nm. The multilayer mirror has alternating layers (4, 6), the alternating layers comprising a first layer and a second layer, the first and second layers being selected from the group consisting of : U and B4C layers, Th and B4C layers, La and B9C layers, La and B4C layers, U and B9C layers, Th and B9C layers, La and B layers, U and B layers, C and B layers, Th and B layers, U compound and B4C layers, Th compound and B4C layers, La compound and B9C layers, La compound and B4C layers, U compound and a B9C layers, Th compound and a B9C layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the first layers is separated from the second layer by an interlayer (7) disposed between at least one of the first layers and the second layer.

Description

MULTILAYER MIRROR AND LITHOGRAPHIC APPARATUS
FIELD
[0001] The present invention relates to a multilayer mirror and a lithographic apparatus that includes such a multilayer mirror.
BACKGROUND
[0002] A lithographic apparatus is a machine that applies a desired pattern onto a substrate, usually onto a target portion of the substrate. A lithographic apparatus can be used, for example, in the manufacture of integrated circuits (ICs). In that instance, a patterning device, which is alternatively referred to as a mask or a reticle, may be used to generate a circuit pattern to be formed on an individual layer of the IC. This pattern can be transferred onto a target portion
(e.g. including part of, one, or several dies) on a substrate (e.g. a silicon wafer). Transfer of the pattern is typically via imaging onto a layer of radiation-sensitive material (resist) provided on the substrate. In general, a single substrate will contain a network of adjacent target portions that are successively patterned.
[0003] Lithography is widely recognized as one of the key steps in the manufacture of ICs and other devices and/or structures. However, as the dimensions of features made using lithography become smaller, lithography is becoming a more critical factor for enabling miniature IC or other devices and/or structures to be manufactured.
[0004] A lithographic apparatus typically includes an illumination system configured to condition a radiation beam; a support structure constructed to hold a patterning device, mostly a reticle or mask, the patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table constructed to hold a substrate; and a projection system configured to project the patterned radiation beam onto a target portion of the substrate.
[0005] A theoretical estimate of the limits of pattern printing can be given by the Rayleigh criterion for resolution as shown in equation (1):
CD = L *-^- (1)
NA 1P1S
where λ is the wavelength of the radiation used, NAps is the numerical aperture of the projection system used to print the pattern, ki is a process dependent adjustment factor, also called the Rayleigh constant, and CD is the feature size (or critical dimension) of the printed feature. It follows from equation (1) that reduction of the minimum printable size of features can be obtained in three ways: by shortening the exposure wavelength λ, by increasing the numerical aperture NAps, or by decreasing the value of Ic1.
[0006] In order to shorten the exposure wavelength and, thus, reduce the minimum printable size, it has been proposed to use an extreme ultraviolet (EUV) radiation source. EUV radiation sources are configured to output a radiation wavelength of about 13.5 nm. Thus, EUV radiation sources may constitute a significant step toward achieving small features printing. Such radiation is termed extreme ultraviolet or soft x-ray, and possible sources include, for example, laser-produced plasma sources, discharge plasma sources, or synchrotron radiation from electron storage rings.
[0007] Preferably, both the illumination system and the projection system include a plurality of optical elements in order to focus the radiation on the desired locations on the patterning device and the substrate, respectively. Unfortunately, apart from some gasses at low density, no materials are known to be transmissive to EUV radiation. Therefore, the lithographic apparatus using EUV radiation does not employ lenses in its illumination system and in its projection system. Instead, the illumination system and the projection system preferably include mirrors. In addition, the patterning device is preferably a reflective device, i.e. a mirror having a reflective surface provided with an pattern formed by an absorptive material on the reflective surface, for the same reason.
[0008] To reflect EUV radiation having a wavelength of about 6.9 nm, multilayer mirrors have been proposed having alternating layers of a metal, such as La, U or Th, and B or a B compound, such as B4C or BgC. Such a multilayer mirror reflects the EUV radiation according to Bragg's Law. However, chemical interaction of for instance La and the B layer or the B compound layer leads to interlayer diffusion.
SUMMARY
[0009] According to an aspect of the present invention, there is provided a mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm, preferably having a wavelength in the range of 6.4nm-7.2nm. The multilayer mirror has alternating layers. The alternating layers include a first layer and a second layer. The first and second layers are selected from the group consisting of: La and B4C layers, U and B4C layers, Th and B4C layers, La and BgC layers U and BgC layers, Th and BgC layers, La and B layers, U and B layers, C and B layers, Th and B layers, U compound and B4C layers, Th compound and B4C layers, La compound and BgC layers, La compound and a B4C layers, U compound and a BgC layers, Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the first layers is separated from a second layer by an interlayer disposed between the at least one of the first layers and the second layer. Preferably, each of the layers of a plurality of the layers is separated from each of the second layers by an interlayer. The interlayer may be selected from the group consisting of: a Sn layer, a Mo layer, and a Cr layer.
[0010] The first layer may be a U compound layer which comprises one or more from the group consisting of UF3, UF4, UF5, UCl3, UCl4, UCl5, UI3, UI4, UO, UO2, UO3, U3O8, U2O5, U3O7, U4O9, UTe2, UTe3, UN, U2N3, and U3N2. Alternatively or additionally, the first layer may be a Th compound layer which comprises one or more from the group consisting OfThF3, ThF4, ThCl4, ThI2, ThI3, ThI4, ThH2, ThO2, ThSe2, and ThN. Yet another possibility is that the first layer is a La compound layer which comprises one or more from the group consisting of LaH2, LaH3, LaF3, LaCl3, LaI3, La2O3, LaSe, and LaTe.
[0011] Typically, the mirror may be comprised in a projection system configured to project a patterned radiation beam onto a target portion of a substrate or the mirror may be comprised in an illumination system configured to condition a radiation beam.
[0012] According to another aspect of the present invention, the projection system and/or the illumination system are comprised in a lithographic apparatus further comprising a support structure constructed to hold a patterning device, the patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam, and a substrate table constructed to hold a substrate.
[0013] According to an aspect of the present invention, there is provided a projection system configured to project a patterned radiation beam onto a target portion of a substrate. The projection system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of 6.2-7.2 nm. The multilayer mirror has alternating layers. The alternating layers include a first layer and a second layer. The first and second layers are selected from the group consisting of: U and B4C layers, Th and B4C layers, La and BgC layers U and BgC layers, Th and BgC layers, La and B layers, U and B layers, Th and B layers, U compound and B4C layers, Th compound and B4C layers, La compound and B9C layers, La compound and a B4C layers, U compound and a BgC layers, Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the the first layers is separated from a second layer by an interlayer disposed between the at least one of the first layers and the second layer. Preferably, each of the layers of a plurality of the layers is separated from each of the second layers by an interlayer.
[0014] According to an aspect of the present invention, there is provided a projection system configured to project a patterned radiation beam onto a target portion of a substrate. The projection system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm. The multilayer mirror has a reflective surface provided with a capping layer that includes Ru, Rh, Ta, Ti, or any combination thereof.
[0015] According to an aspect of the present invention, there is provided an illumination system configured to condition a radiation beam. The illumination system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm. The multilayer mirror has alternating layers. The alternating layers include a first layer and a second layer. The first and second layers are selected from the group consisting of: U and B4C layers, Th and B4C layers, La and BgC layers U and BgC layers, Th and BgC layers, La and B layers, U and B layers, Th and B layers, U compound and B4C layers, Th compound and B4C layers, La compound and BgC layers, La compound and a B4C layers, U compound and a BgC layers, Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the the first layers is separated from a second layer by an interlayer disposed between the at least one of the first layers and the second layer. Preferably, each of the layers of a plurality of the layers is separated from each of the second layers by an interlayer. [0016] According to an aspect of the present invention, there is provided an illumination system configured to condition a radiation beam. The illumination system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm. The multilayer mirror has a reflective surface provided with a capping layer that includes Ru, Rh, Ta, Ti, or any combination thereof. [0017] According to an aspect of the present invention, there is provided a lithographic projection apparatus arranged to project a pattern from a patterning device onto a substrate. The lithographic apparatus includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm. The multilayer mirror has alternating layers. The alternating layers include a first layer and a second layer. The first and second layers are selected from the group consisting of: U and B4C layers, Th and B4C layers, La and BgC layers U and BgC layers, Th and BgC layers, La and B layers, U and B layers, Th and B layers, U compound and B4C layers, Th compound and B4C layers, La compound and BgC layers, La compound and a B4C layers, U compound and a BgC layers, Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the the first layers is separated from a second layer by an interlay er disposed between the at least one of the first layers and the second layer. Preferably, each of the layers of a plurality of the layers is separated from each of the second layers by an interlayer.
[0018] According to an aspect of the present invention, there is provided a lithographic projection apparatus arranged to project a pattern from a patterning device onto a substrate. The lithographic apparatus includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm. The multilayer mirror has a reflective surface provided with a capping layer that includes Ru, Rh, Ta, Ti, or any combination thereof.
[0019] According to an aspect of the present invention, there is provided a lithographic apparatus that includes an illumination system configured to condition a radiation beam, and a support structure constructed to hold a patterning device. The patterning device is capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam. The apparatus also includes a substrate table constructed to hold a substrate, and a projection system configured to project the patterned radiation beam onto a target portion of the substrate. The illumination system and/or the projection system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm. The multilayer mirror has alternating layers. The alternating layers include a first layer and a second layer. The first and second layers are selected from the group consisting of: U and B4C layers, Th and B4C layers, La and BgC layers U and BgC layers, Th and BgC layers, La and B layers, U and B layers, Th and B layers, U compound and B4C layers, Th compound and B4C layers, La compound and BgC layers, La compound and a B4C layers, U compound and a BgC layers, Th compound and a BgC layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the the first layers is separated from a second layer by an interlayer disposed between the at least one of the first layers and the second layer. Preferably, each of the layers of a plurality of the layers is separated from each of the second layers by an interlayer.
[0020] Each first layer of a plurality of first layers may be separated from a second layer by an interlayer. The interlayer may be selected from the group consisting of: a Sn layer, a Mo layer, a Cr layer, a Sn compound layer, a Mo compound layer, and a Cr compound layer. [0021] The interlay er may selected from the group consisting of: a Sn layer, a Mo layer, a Cr layer, a Sn compound layer, a Mo compound layer, and a Cr compound layer. If the interlayer is a Sn compound layer, the Sn compound may include at least one of the group consisting Of SnF2, SnF4, SnCl2, SnCl4, SnI2, SnI4, SnO, SnO2, SnSe, SnSe2, and SnTe. If the interlayer is a Cr compound layer, the Cr compound may include at least one OfCrF2, CrF3, CrF4, CrCl2, CrCl3, CrCl4, CrI2, CrI3, CrI4, CrO2, CrO3, Cr2O3, Cr3O4, CrN, CrSe, and Cr2Te3. If the interlayer is a Mo compound layer, the Mo compound may include at least one of the group consisting OfMoF3, MoF4, MoCl2, MoCl3, MoCl4, MoI2, MoI3, MoI4, MoO, MoO2, MoO3, MoSe2, MoTe2, and MoN.
[0022] In an embodiment of the multilayer mirror, the first layer may be a Th compound layer, wherein the Th compound layer includes one or more from the group consisting OfThF3, ThF4, ThCl4, ThI2, ThI3, ThI4, ThH2, ThO2, ThSe2, and ThN. In another embodiment of the multilayer mirror, the first layer may be a U compound layer, wherein the U compound layer includes one or more from the group consisting of UF3, UF4, UF5, UCl3, UCl4, UCl5, UI3, UI4, UO, UO2, UO3, U3O8, U2O5, U3O7, U4O9, UTe2, UTe3, UN, U2N3, and U3N2. In yet another embodiment of the multilayer mirror, the first layer may be a La compound layer, wherein the La compound layer includes one or more from the group consisting OfLaH2, LaH3, LaF3, LaCl3, LaI3, La2O3, LaSe, and LaTe.
[0023] According to an aspect of the present invention, there is provided a lithographic apparatus that includes an illumination system configured to condition a radiation beam, and a support structure constructed to hold a patterning device. The patterning device is capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam. The apparatus also includes a substrate table constructed to hold a substrate, and a projection system configured to project the patterned radiation beam onto a target portion of the substrate. The illumination system and/or the projection system includes a multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of 2-8 nm. The multilayer mirror has a reflective surface provided with a capping layer that includes Ru, Rh, Ta, Ti, or any combination thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which: [0025] Figure 1 schematically depicts a lithographic apparatus according to an embodiment of the present invention;
[0026] Figure 2 schematically depicts a side view of an EUV illumination system and projection system of the lithographic projection apparatus of Figure 1;
[0027] Figure 3 schematically depicts a multilayer mirror of the lithographic apparatus of
Figure 1 according to an embodiment of the present invention;
[0028] Figures 4a, 4b, and 4c depict reflectance of embodiments of the multilayer mirror of
Figure 3 as a function of wavelength;
[0029] Figure 5 depicts an embodiment of the multilayer mirror of the lithographic apparatus of Figure 1;
[0030] Figure 6 depicts an embodiment of the multilayer mirror of the lithographic apparatus of Figure 1; and
[0031] Figure 7 depicts an embodiment of the multilayer mirror of the lithographic apparatus of Figure 1.
DETAILED DESCRIPTION
[0032] Figure 1 schematically depicts a lithographic apparatus according to an embodiment of the invention. The apparatus includes: an illumination system (illuminator) IL configured to condition a radiation beam B (e.g. EUV radiation); a patterning device support or support structure (e.g. a mask table) MT constructed to support a patterning device (e.g. a mask or a reticle) MA and connected to a first positioner PM configured to accurately position the patterning device; a substrate table (e.g. a wafer table) WT constructed to hold a substrate (e.g. a resist-coated wafer) W and connected to a second positioner PW configured to accurately position the substrate; and a projection system (e.g. a reflective projection lens system) PS configured to project a pattern imparted to the radiation beam B by patterning device MA onto a target portion C (e.g. including one or more dies) of the substrate W.
[0033] The illumination system may include various types of optical components, such as refractive, reflective, magnetic, electromagnetic, electrostatic or other types of optical components, or any combination thereof, to direct, shape, or control radiation. However, optical components which are configured to condition the radiation beam B are preferably reflective components.
[0034] The support structure holds the patterning device in a manner that depends on the orientation of the patterning device, the design of the lithographic apparatus, and other conditions, such as for example whether or not the patterning device is held in a vacuum environment. The support structure can use mechanical, vacuum, electrostatic or other clamping techniques to hold the patterning device. The support structure may be a frame or a table, for example, which may be fixed or movable as desired. The support structure may ensure that the patterning device is at a desired position, for example with respect to the projection system.
[0035] The term "patterning device" should be broadly interpreted as referring to any device that can be used to impart a radiation beam with a pattern in its cross-section such as to create a pattern in a target portion of the substrate. The pattern imparted to the radiation beam may correspond to a particular functional layer in a device being created in the target portion, such as an integrated circuit.
[0036] The patterning device may be transmissive, but is preferably reflective. Examples of patterning devices include masks, programmable mirror arrays, and programmable LCD panels. Masks are well known in lithography, and include mask types such as binary, alternating phase-shift, and attenuated phase-shift, as well as various hybrid mask types. An example of a programmable mirror array employs a matrix arrangement of small mirrors, each of which can be individually tilted so as to reflect an incoming radiation beam in different directions. The tilted mirrors impart a pattern in a radiation beam which is reflected by the mirror matrix.
[0037] The term "projection system" may encompass any type of projection system, including refractive, reflective, catadioptric, magnetic, electromagnetic and electrostatic optical systems, or any combination thereof, as appropriate for the exposure radiation being used, or for other factors, especially the use of a vacuum. It may be desired to use a vacuum for
EUV or electron beam radiation since other gases may absorb too much radiation or electrons.
A vacuum environment may therefore be provided to the whole beam path with the aid of a vacuum wall and vacuum pumps.
[0038] As here depicted, the apparatus is of a reflective type (e.g. employing a reflective mask). Alternatively, the apparatus may be of a transmissive type (e.g. employing a transmissive mask).
[0039] The lithographic apparatus may be of a type having two (dual stage) or more substrate tables (and/or two or more mask tables). In such "multiple stage" machines the additional tables may be used in parallel, or preparatory steps may be carried out on one or more tables while one or more other tables are being used for exposure.
[0040] Referring to Figure 1 , the illuminator IL receives a radiation beam from a radiation source SO. The source and the lithographic apparatus may be separate entities, for example when the source is an excimer laser. In such cases, the source is not considered to form part of the lithographic apparatus and the radiation beam is passed from the source SO to the illuminator IL with the aid of a beam delivery system including, for example, suitable directing mirrors and/or a beam expander. In other cases the source may be an integral part of the lithographic apparatus, for example when the source is a mercury lamp. The source SO and the illuminator IL, together with the beam delivery system if desired, may be referred to as a radiation system.
[0041] The illuminator IL may include an adjuster to adjust the angular intensity distribution of the radiation beam. Generally, at least the outer and/or inner radial extent (commonly referred to as σ-outer and σ-inner, respectively) of the intensity distribution in a pupil plane of the illuminator can be adjusted. In addition, the illuminator IL may include various other components, such as an integrator and a condenser. The illuminator may be used to condition the radiation beam, to have a desired uniformity and intensity distribution in its cross-section.
[0042] The radiation beam B is incident on the patterning device (e.g., mask) MA, which is held on the support structure (e.g., mask table) MT, and is patterned by the patterning device. After being reflected from the patterning device (e.g. mask) MA, the radiation beam B passes through the projection system PS, which focuses the beam onto a target portion C of the substrate W. With the aid of the second positioner PW and position sensor IF2 (e.g. an interferometric device, linear encoder or capacitive sensor), the substrate table WT can be moved accurately, e.g. so as to position different target portions C in the path of the radiation beam B. Similarly, the first positioner PM and another position sensor IFl can be used to accurately position the patterning device (e.g. mask) MA with respect to the path of the radiation beam B. Patterning device (e.g. mask) MA and substrate W may be aligned using patterning device alignment marks Ml, M2 and substrate alignment marks Pl, P2. [0043] The depicted apparatus could be used in at least one of the following modes: [0044] 1. In step mode, the support structure (e.g. mask table) MT and the substrate table WT are kept essentially stationary, while an entire pattern imparted to the radiation beam is projected onto a target portion C at one time (i.e. a single static exposure). The substrate table WT is then shifted in the X and/or Y direction so that a different target portion C can be exposed.
[0045] 2. In scan mode, the support structure (e.g. mask table) MT and the substrate table WT are scanned synchronously while a pattern imparted to the radiation beam is projected onto a target portion C (i.e. a single dynamic exposure). The velocity and direction of the substrate table WT relative to the support structure (e.g. mask table) MT may be determined by the (de-)magnification and image reversal characteristics of the projection system PS. [0046] 3. In another mode, the support structure (e.g. mask table) MT is kept essentially stationary holding a programmable patterning device, and the substrate table WT is moved or scanned while a pattern imparted to the radiation beam is projected onto a target portion C. In this mode, generally a pulsed radiation source is employed and the programmable patterning device is updated as desired after each movement of the substrate table WT or in between successive radiation pulses during a scan. This mode of operation can be readily applied to maskless lithography that utilizes programmable patterning device, such as a programmable mirror array of a type as referred to above.
[0047] Combinations and/or variations on the above described modes of use or entirely different modes of use may also be employed.
[0048] Figure 2 shows the lithographic apparatus of Figure 1 in more detail, including a radiation system 42, an illumination optics unit 44, and the projection system PS. The radiation system 42 includes the radiation source SO which may be formed by a discharge plasma. EUV radiation may be produced by a gas or vapor, for example Xe gas, Li vapor or Sn vapor in which a very hot plasma is created to emit radiation in the EUV range of the electromagnetic spectrum. The very hot plasma is created by causing an at least partially ionized plasma by, for example, an electrical discharge. Partial pressures of, for example, 10 Pa of Xe, Li, Sn vapor or any other suitable gas or vapor may be desired for efficient generation of the radiation. The radiation emitted by radiation source SO is passed from a source chamber 47 into a collector chamber 48 via a gas barrier or contaminant trap 49 which is positioned in or behind an opening in source chamber 47. The gas barrier 49 may include a channel structure. [0049] The collector chamber 48 includes a radiation collector 50 which may be formed by a grazing incidence collector. Radiation collector 50 has an upstream radiation collector side 50a and a downstream radiation collector side 50b. Radiation passed by collector 50 can be reflected off a grating spectral filter 51 to be focused in a virtual source point 52 at an aperture in the collector chamber 48. From collector chamber 48, a beam of radiation 56 is reflected in illumination optics unit 44 via normal incidence reflectors 53, 54 onto a reticle or mask positioned on reticle or mask table MT. A patterned beam 57 is formed which is imaged in projection system PS via reflective elements 58, 59 onto wafer stage or substrate table WT. More elements than shown may generally be present in illumination optics unit 44 and projection system PS. Grating spectral filter 51 may optionally be present, depending upon the type of lithographic apparatus. Further, there may be more mirrors present than those shown in the Figures, for example there may be 1-4 more reflective elements present than 58, 59. Radiation collectors 50 are known from the prior art. The collector 50 may be a nested collector with reflectors 142, 143, and 146. A space 180 is provided between two reflectors, e.g. between reflectors 142 and 143.
[0050] Figure 3 depicts an embodiment of a multilayer mirror 1. The multilayer mirror 1 is constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm. The multilayer mirror includes a layered structure 2 which has alternating layers 4, 6 supported by a substrate 8. In embodiments of the invention, the multilayer mirror may be located in various parts of the lithographic apparatus, such as the projection system and the illumination system.
[0051] The alternating layers 4, 6 may be selected from the group consisting of: La and B4C layers, U and B4C layers, Th and B4C layers, La and B9C layers U and B9C layers, Th and B9C layers, La and B layers, U and B layers, and Th and B layers. [0052] In an embodiment, the alternating layers 4, 6 may be selected from the group consisting of: U and B4C layers, Th and B4C layers, U and B9C layers, Th and B9C layers, U and B layers, Th and B layers U compound and B4C layers, Th compound and B4C layers, La compound and B9C layers, La compound and a B4C layers, U compound and a B9C layers, Th compound and a B9C layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers. Examples of suitable U compounds are UF3, UF4, UF5, UCI3, UCl4, UCl5, UI3, UI4, UO, UO2, UO3, U3O8, U2O5, U3O7, U4O9, UTe2, UTe3, UN, U2N3, and U3N2. Examples of suitable Th compounds are ThF3, ThF4, ThCl4, ThI2, ThI3, ThI4, ThH2, ThO2, ThSe2, and ThN. Examples of suitable La compounds are LaH2, LaH3, LaF3, LaCl3, LaI3, La2O3, LaSe, and LaTe.
[0053] A potential benefit of such alternating layers is that U layers or Th layers instead of La layers will provide a broad bandwidth, both in terms of angle as well as wavelength. The broad angle bandwidth will allow for a good amount of design freedom, making the multilayer mirror useful for optics in EUV lithography at 6.6 nm wavelength. Also, it may allow for a pupil of an optical system in which the multilayer mirror is included to be homogeneously filled in terms of intensity and allows for a larger numerical aperture (NA). [0054] It can be seen in Figures 3, 5, 6 and 7 that between a first layer 4, for instance a La layer and a second layer 6, for instance a B4C layer, an interlayer 7 is provided configured to prevent diffusion between the first layer 4 and the second layer 6. Such an interlayer may have a thickness between about 0.2nm and about lnm. Preferably, each of the first layers 4 is separated from each of the second layers 6 by such an interlayer 7. [0055] The interlayer 7 may be a Sn layer, a Mo layer, or a Cr layer. Alternatively, the inter layer may be a Sn compound, such as SnF2, SnF4, SnCl2, SnCl4, SnI2, SnI4, SnO, SnO2,
SnSe, SnSe2, or SnTe, a Cr compound, such as CrF2, CrF3, CrF4, CrCl2, CrCl3, CrCl4, CrI2, CrI3,
CrI4, CrO2, CrO3, Cr2O3, Cr3O4, CrN, CrSe, or Cr2Te3, or a Mo compound, such as MoF3,
MoF4, MoCl2, MoCl3, MoCl4, MoI2, MoI3, MoI4, MoO, MoO2, MoO3, MoSe2, MoTe2, or
MoN.
[0056] As a person skilled in the art will readily acknowledge, the alternating layers 4, 6 and the interlay ers 7 multilayer mirrors 1 of Figures 3, 5, 6 and 7 can be manufactured by way of deposition techniques such as magnetron sputtering or electron beam sputtering.
[0057] Figure 4a is a graph showing reflectance R as a function of wavelength λ for alternating layers which are La and B4C layers. The so-called full width half maximum
(FWHM) of the peak shown is 0.06 nm. Figure 4b shows reflectance as a function of wavelength λ for alternating layers which are Th and B4C layers (Th/B4C layers). Here, the
FWHM is 0.09 nm. Figure 4c shows reflectance as a function of wavelength λ for alternating layers which are Th and B4C layers (LVB4C layers). Here, the FWHM is 0.15 nm.
[0058] In an embodiment, Th/BgC layers and U/B9C layers or even Th/B layers and U/B layers may be used instead of TbVB4C layers and LVB4C layers respectively. An increased B purity may allow for better reflectivity, thereby potentially reducing power losses due to absorption of radiation.
[0059] In an embodiment, the alternating layers may be C and B4C layers, C and B9C layers, or C and B layers. C is not as active as La and, therefore, in these alternating layers not as much interlayer diffusion may occur as in La/B4C layers.
[0060] A period, which may well be the sum of a thickness of the first layer 4 and a thickness of the second layer 6 and two antidiffusion layers 7, may be within the range of 3 -
3.5 nm. The alternating layers may have a period thickness which is between about 1.7 and about 2.5 times the thickness of the first layer or the second layer.
[0061] An embodiment of the multilayer mirror 1 is shown in Figure 5. This embodiment is a reflective reticle. In addition to the features of the multilayer mirror of Figure 3, the embodiment of Figure 5 may be provided with a structure having an absorptive material which is arranged to define the pattern on its surface. Suitable materials to be employed as the absorptive material may be Cr, Ti, Si, Ru, Mo, Ta, Al, or any combination thereof.
[0062] The multilayer structure 2 of the multilayer mirror 1 may be supported by a substrate 8 in order to reduce mechanical vulnerability. Also, it is to be noted that the dotted lines in Figures 3 and 5 indicate an unspecified number of repeating alternating layers 4, 6. Typically, the multilayer structure 2 of the mirror 1 is formed by a number of 30 to 200 periods of alternating layers, i.e. a total number of layers between 60 and 400. Moreover, it should be noted that the Figures are schematic serving merely as illustrations and that they are not scale drawings.
[0063] Further embodiments of the multilayer mirror 1 are depicted in Figures 6 and 7. The embodiment of Figure 6 is similar to the embodiment of Figure 3. However, in the embodiment of Figure 6, the layered structure 2 is provided with a capping layer 12. The capping layer 12 may include Ru, Ta, Ti, Rh, or any combination thereof. Such a capping layer may be suitably arranged to protect the layered structure of the multilayer mirror 1 against chemical attack. A suitable thickness for the capping layer may be anywhere within the range of 0.5 to 10 nm. [0064] Another embodiment is depicted in Figure 7. The embodiment of Figure 7 is similar to the embodiment of Figure 4. However, in the embodiment of Figure 7, the layered structure 2 is provided with a capping layer 12. Same as mentioned while referring to Figure 6, the capping layer 12 may include Ru, and/or Rh and may be suitably arranged to protect the layered structure of the multilayer mirror 1 against chemical attack. [0065] Although specific reference may be made in this text to the use of lithographic apparatus in the manufacture of ICs, it should be understood that an embodiment of the multilayer mirror according to the invention may have interlayers, wherein an interlayer is a Sn layer and a further interlayer is a Mo layer, or wherein an interlayer is a Cr interlayer and a further interlayer is an interlayer containing other suitable material. In yet another embodiment, an Sn interlayer, a further Mo interlayer, and a yet further Cr interlayer may be provided. Also, it is possible that a multilayer mirror is provided having one or more interlayers, the interlayers including Sn alloys, Mo alloys or Cr alloys.
[0066] The lithographic apparatus described herein may have other applications, such as the manufacture of integrated optical systems, guidance and detection patterns for magnetic domain memories, flat-panel displays, liquid-crystal displays (LCDs), thin- film magnetic heads, etc.
[0067] Although specific reference may have been made above to the use of embodiments of the invention in the context of optical lithography, it will be appreciated that the invention may be used in other applications, for example imprint lithography, and where the context allows, is not limited to optical lithography.
[0068] The terms "radiation" and "beam" used herein encompass all types of electromagnetic radiation, including ultraviolet (UV) radiation (e.g. having a wavelength of or about 365, 355, 248, 193, 157 or 126 nm) and extreme ultra-violet (EUV) radiation (e.g. having a wavelength in the range of 5-20 nm), as well as particle beams, such as ion beams or electron beams.
[0069] While specific embodiments of the invention have been described above, it will be appreciated that the invention may be practiced otherwise than as described. For example, the invention may take the form of a computer program containing one or more sequences of machine-readable instructions describing a method as disclosed above, or a data storage medium (e.g. semiconductor memory, magnetic or optical disk) having such a computer program stored therein.
[0070] The descriptions above are intended to be illustrative, not limiting. Thus, it will be apparent to one skilled in the art that modifications may be made to the invention as described without departing from the scope of the claims set out below.

Claims

WHAT IS CLAIMED IS:
1. A multilayer mirror constructed and arranged to reflect radiation having a wavelength in the range of about 6.4nm - about 7.2nm, the multilayer mirror having alternating layers, the alternating layers comprising a first layer and a second layer, the first and second layers being selected from the group consisting of: U and B4C layers, Th and B4C layers, La and B9C layers, La and B4C layers, U and B9C layers, Th and B9C layers, La and B layers, U and B layers, C and B layers, Th and B layers, U compound and B4C layers, Th compound and B4C layers, La compound and B9C layers, La compound and a B4C layers, U compound and a B9C layers, Th compound and a B9C layers, La compound and a B layers, U compound and B layers, and Th compound and a B layers, wherein at least one of the first layers is separated from a second layer by an interlayer disposed between the at least one of the first layers and the second layer.
2. The multilayer mirror according to claim 1, wherein each first layer of a plurality of first layers is separated from a second layer by an interlayer.
3. The multilayer mirror according to claim 1 or 2, wherein the interlayer is selected from the group consisting of: a Sn layer, a Mo layer, a Cr layer, a Sn compound layer, a Mo compound layer, and a Cr compound layer.
4. The multilayer mirror according to claim 3, wherein the interlayer is a Sn compound layer, the Sn compound layer comprising at least one of the group consisting of SnF2, SnF4, SnCl2, SnCl4, SnI2, SnI4, SnO, SnO2, SnSe, SnSe2, and SnTe.
5. The multilayer mirror according to claim 3, wherein the interlayer is a Cr compound layer, the Cr compound layer comprising at least one of the group consisting OfCrF2, CrF3, CrF4, CrCl2, CrCl3, CrCl4, CrI2, CrI3, CrI4, CrO2, CrO3, Cr2O3, Cr3O4, CrN, CrSe, and Cr2Te3.
6. The multilayer mirror according to claim 3, wherein the interlayer is a Mo compound layer, the Mo compound layer comprising at least one of the group consisting of MoF3, MoF4, MoCl2, MoCl3, MoCl4, MoI2, MoI3, MoI4, MoO, MoO2, MoO3, MoSe2, MoTe2, and MoN.
7. The multilayer mirror according to any one of the preceding claims, wherein the sum of a thickness of the first layer and a thickness of the second layer is within the range of about 2.2nm - about 3.5 nm.
8. The multilayer mirror according to any one of the preceding claims, wherein the interlayer has a thickness within the range of about 0.2nm to about 1.Onm.
9. The multilayer mirror according to any one of the preceding claims, wherein the alternating layers have a period thickness which is between about 1.7 and about 2.5 times the thickness of the first layer or the second layer.
10. The multilayer mirror according to any one of the preceding claims, wherein the multilayer mirror is a patterning device constructed and arranged to provide a beam of the radiation with a pattern in its cross-section.
11. The multilayer mirror according to claim 10, wherein the patterning device is a reticle or a mask.
12. The multilayer mirror according to claim 11 , wherein the reticle or mask is provided with a structure having an absorptive material arranged to define the pattern, the absorptive material being Cr, Ta, Ti, Si, Ru, Mo, Al, or any combination thereof.
13. The multilayer mirror according to any one of the preceding claims, wherein the multilayer mirror has a reflective surface provided with a capping layer comprising Ru, Rh, Ta, Ti ,or any combination thereof.
14. A lithographic projection apparatus arranged to project a pattern from a patterning device onto a substrate, wherein the lithographic apparatus comprises a multilayer mirror according to any one of claims 1-13.
15. The lithographic apparatus according to claim 14, further comprising: an illumination system configured to condition a radiation beam; a support structure constructed to hold a patterning device, the patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table constructed to hold a substrate; and a projection system configured to project the patterned radiation beam onto a target portion of the substrate.
PCT/EP2010/050195 2009-02-13 2010-01-11 Multilayer mirror and lithographic apparatus WO2010091907A1 (en)

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SG2011055241A SG174126A1 (en) 2009-02-13 2010-01-11 Multilayer mirror and lithographic apparatus
US13/201,242 US9082521B2 (en) 2009-02-13 2010-01-11 EUV multilayer mirror with interlayer and lithographic apparatus using the mirror
CN201080007169XA CN102318010A (en) 2009-02-13 2010-01-11 Multilayer mirror and lithographic apparatus
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012222349A (en) * 2011-04-05 2012-11-12 Asml Netherlands Bv Multilayer mirror and lithographic apparatus
WO2015039705A1 (en) 2013-09-23 2015-03-26 Carl Zeiss Smt Gmbh Multilayer mirror
US9377695B2 (en) 2011-02-24 2016-06-28 Asml Netherlands B.V. Grazing incidence reflectors, lithographic apparatus, methods for manufacturing a grazing incidence reflector and methods for manufacturing a device
US9448492B2 (en) 2011-06-15 2016-09-20 Asml Netherlands B.V. Multilayer mirror, method of producing a multilayer mirror and lithographic apparatus
EP3239745A1 (en) * 2016-04-29 2017-11-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Mirror for reflecting euv radiation with tension compensation and method for producing the same

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2003950C2 (en) * 2009-12-11 2011-06-15 Panalytical Bv METHOD FOR MANUFACTURING A MULTI-LAYER STRUCTURE WITH A LATERAL PATTERN FOR USE IN THE XUV WAVE LENGTH AREA AND BT AND LMAG STRUCTURES MANUFACTURED BY THIS METHOD.
WO2013113537A2 (en) * 2012-01-30 2013-08-08 Asml Netherlands B.V. Optical element, lithographic apparatus incorporating such an element, method of manufacturing an optical element
DE102013210533A1 (en) * 2013-06-06 2014-12-11 Carl Zeiss Smt Gmbh MIRROR FOR BEUV LIGHT
JP6741600B2 (en) * 2014-07-04 2020-08-19 エーエスエムエル ネザーランズ ビー．ブイ． Film used in a lithographic apparatus and a lithographic apparatus including such a film
DE102016118940B3 (en) * 2016-10-06 2018-01-25 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Multilayer mirror for reflection of EUV radiation and method for its production
JP6838922B2 (en) 2016-10-11 2021-03-03 キヤノン株式会社 Image reader and image forming device
JP6849378B2 (en) 2016-10-11 2021-03-24 キヤノン株式会社 Image reader and image forming device
DE102016224111A1 (en) * 2016-12-05 2017-11-30 Carl Zeiss Smt Gmbh Reflective optical element for the extreme ultraviolet wavelength range

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5485499A (en) * 1994-08-05 1996-01-16 Moxtek, Inc. High throughput reflectivity and resolution x-ray dispersive and reflective structures for the 100 eV to 5000 eV energy range and method of making the devices
US20030185341A1 (en) * 2002-02-20 2003-10-02 Carsten Michaelsen Mirror element for the reflection of x-rays
WO2004023495A1 (en) * 2002-09-05 2004-03-18 Osmic, Inc. Method and apparatus for detecting boron in x-ray fluorescence spectroscopy
WO2010003487A1 (en) * 2008-07-09 2010-01-14 Carl Zeiss Smt Ag Reflective optical element and method for the production thereof

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2814595B2 (en) * 1989-08-18 1998-10-22 株式会社ニコン Multilayer reflector
JPH07244199A (en) * 1994-03-02 1995-09-19 Hitachi Ltd Projective exposure method and device
US6150022A (en) 1998-12-07 2000-11-21 Flex Products, Inc. Bright metal flake based pigments
FR2802311B1 (en) 1999-12-08 2002-01-18 Commissariat Energie Atomique LITHOGRAPHY DEVICE USING A RADIATION SOURCE IN THE EXTREME ULTRAVIOLET AREA AND MULTI-LAYER SPECTRAL BAND MIRRORS IN THIS AREA
JP3806711B2 (en) * 2002-09-11 2006-08-09 Ｈｏｙａ株式会社 REFLECTIVE MASK BLANK, REFLECTIVE MASK MANUFACTURING METHOD, AND SEMICONDUCTOR DEVICE MANUFACTURING METHOD
US20040130693A1 (en) * 2002-10-31 2004-07-08 Asml Netherlands B.V. Lithographic apparatus, optical element and device manufacturing method
WO2004086522A1 (en) * 2003-03-24 2004-10-07 Showa Denko K.K. Ohmic electrode structure, compound semiconductor light-emitting device having the same, and led lamp
US7217940B2 (en) 2003-04-08 2007-05-15 Cymer, Inc. Collector for EUV light source
EP1496521A1 (en) * 2003-07-09 2005-01-12 ASML Netherlands B.V. Mirror and lithographic apparatus with mirror
US7375794B2 (en) 2004-08-04 2008-05-20 Asml Netherlands B.V. Lithographic apparatus and device manufacturing method
TWI286891B (en) 2004-11-18 2007-09-11 Via Tech Inc Method and device for receiving a packet
JP2006173490A (en) 2004-12-17 2006-06-29 Nikon Corp Optical element and projection aligner using the same
US7336416B2 (en) 2005-04-27 2008-02-26 Asml Netherlands B.V. Spectral purity filter for multi-layer mirror, lithographic apparatus including such multi-layer mirror, method for enlarging the ratio of desired radiation and undesired radiation, and device manufacturing method
US7262423B2 (en) * 2005-12-02 2007-08-28 Asml Netherlands B.V. Radiation system and lithographic apparatus
JP2007198782A (en) 2006-01-24 2007-08-09 Nikon Corp Multilayer-film reflecting mirror and exposure system
DE102006022352B4 (en) * 2006-05-12 2014-11-20 Qimonda Ag Arrangement for projecting a pattern from an EUV mask onto a substrate
CN102047183B (en) * 2008-06-04 2013-12-18 Asml荷兰有限公司 Multilayer mirror and lithographic apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5485499A (en) * 1994-08-05 1996-01-16 Moxtek, Inc. High throughput reflectivity and resolution x-ray dispersive and reflective structures for the 100 eV to 5000 eV energy range and method of making the devices
US20030185341A1 (en) * 2002-02-20 2003-10-02 Carsten Michaelsen Mirror element for the reflection of x-rays
WO2004023495A1 (en) * 2002-09-05 2004-03-18 Osmic, Inc. Method and apparatus for detecting boron in x-ray fluorescence spectroscopy
WO2010003487A1 (en) * 2008-07-09 2010-01-14 Carl Zeiss Smt Ag Reflective optical element and method for the production thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANDREEV S S ET AL: "Multilayered mirrors based on La/B4C(B9C) for X-ray range near anomalous dispersion of boron (lambda~6.7nm)", NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH, SECTION - A:ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, ELSEVIER, AMSTERDAM, NL, vol. 603, no. 1-2, 3 January 2009 (2009-01-03), pages 80 - 82, XP026102657, ISSN: 0168-9002, [retrieved on 20090103] *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9377695B2 (en) 2011-02-24 2016-06-28 Asml Netherlands B.V. Grazing incidence reflectors, lithographic apparatus, methods for manufacturing a grazing incidence reflector and methods for manufacturing a device
JP2012222349A (en) * 2011-04-05 2012-11-12 Asml Netherlands Bv Multilayer mirror and lithographic apparatus
US9448492B2 (en) 2011-06-15 2016-09-20 Asml Netherlands B.V. Multilayer mirror, method of producing a multilayer mirror and lithographic apparatus
WO2015039705A1 (en) 2013-09-23 2015-03-26 Carl Zeiss Smt Gmbh Multilayer mirror
US10209411B2 (en) 2013-09-23 2019-02-19 Carl Zeiss Smt Gmbh Multilayer mirror
EP3239745A1 (en) * 2016-04-29 2017-11-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Mirror for reflecting euv radiation with tension compensation and method for producing the same

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