WO2022073610A1 - Herstellungsverfahren und messverfahren - Google Patents
Herstellungsverfahren und messverfahren Download PDFInfo
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- WO2022073610A1 WO2022073610A1 PCT/EP2020/078193 EP2020078193W WO2022073610A1 WO 2022073610 A1 WO2022073610 A1 WO 2022073610A1 EP 2020078193 W EP2020078193 W EP 2020078193W WO 2022073610 A1 WO2022073610 A1 WO 2022073610A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- optical element
- coolant
- cooling channel
- substrate
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
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- 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
- G03F7/70858—Environment aspects, e.g. pressure of beam-path gas, temperature
- G03F7/70883—Environment aspects, e.g. pressure of beam-path gas, temperature of optical system
- G03F7/70891—Temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2441—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures using interferometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
- G01B9/02034—Interferometers characterised by particularly shaped beams or wavefronts
- G01B9/02038—Shaping the wavefront, e.g. generating a spherical wavefront
- G01B9/02039—Shaping the wavefront, e.g. generating a spherical wavefront by matching the wavefront with a particular object surface shape
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
- G01B9/02055—Reduction or prevention of errors; Testing; Calibration
- G01B9/02075—Reduction or prevention of errors; Testing; Calibration of particular errors
- G01B9/02076—Caused by motion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/005—Testing of reflective surfaces, e.g. mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/181—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
- G02B7/1815—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation with cooling or heating systems
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- 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
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- 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
- G03F7/70233—Optical aspects of catoptric systems, i.e. comprising only reflective elements, e.g. extreme ultraviolet [EUV] projection systems
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- 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
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- 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
- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
- G03F7/70591—Testing optical components
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
- G02B2207/101—Nanooptics
Definitions
- the invention relates to a method for measuring a surface shape of an optical element in a measurement environment, the optical element having a base body with a substrate and a reflecting surface, and at least one cooling channel for receiving a coolant being formed in the substrate.
- the invention also relates to a measuring device for measuring the surface shape of the optical element, a method for producing the optical element and a projection exposure system.
- Microlithography is used to manufacture microstructured components such as integrated circuits or LCDs (Liquid Crystal Displays).
- the microlithography process is carried out, inter alia, in what is known as a projection exposure system, which has an illumination device and a projection lens.
- a substrate e.g. a silicon wafer
- a light-sensitive layer photoresist
- NA image-side numerical aperture
- Increasing the image-side numerical aperture (NA) is typically accompanied by an increase in the required mirror surfaces of the mirrors used in the projection exposure system.
- the optical element changes as a result of absorption of the useful light used during operation, in particular EUV light , heats up.
- the heating of the optical element results in particular in the problem that the optical element is thermally deformed, for example expands, so that an optical performance of the system in which the optical element is used no longer corresponds to predefinable specifications.
- cooling concepts have been developed in order to dissipate the heat generated in the optical element during operation.
- Known cooling concepts consist in particular of forming at least one cooling channel for receiving a coolant in the otherwise solid base body or substrate of the optical element.
- Optical elements that have at least one such cooling channel are known from WO 2012/126830 A1, US Pat. No. 7,591, 561 B2, DE 10 2018 208 783 A1, DE 10 2010 034 476 A1, WO 2009/046955 A2, DE 10 2017 221 388 A1 and DE 10 2018 202 687 A1.
- a challenge with optical elements that have at least one such cooling channel is the high-precision interferometric measurement of these optical elements.
- Another problem is that the material of the substrate and in particular the cooling channel, which is usually filled with air, have different refractive indices.
- the different refractive indices lead to an undesired back reflection of the measuring light reflected in particular at an interface between the substrate and the cooling channel.
- an object of the present invention to provide a method and a measuring device with which the aforementioned problems are solved, in particular with which the surface shape of an optical element, which has at least one cooling channel, can be measured reliably and with high precision. Another object is to provide a manufacturing method for an optical element that can be measured reliably and with high precision, and for such an optical element.
- the method for measuring the surface shape of the optical element is carried out with the following steps: a) detecting a cooling channel pressure; b) detecting a measurement ambient pressure; c) determining an actual pressure difference based on the cooling channel pressure and the measurement ambient pressure; d) comparing the actual pressure difference with a predefinable setpoint pressure difference; e) monitoring for a discrepancy between the actual pressure difference and the target pressure difference, wherein if a discrepancy greater than a predefinable limit value is detected, the cooling channel pressure is adjusted in such a way that the discrepancy is less than or equal to the definable limit value; f) Measurement of the surface shape if the deviation is less than or equal to the predefinable limit value.
- the method according to the invention has the advantage that the actual pressure difference can be adjusted or adjusted to the setpoint pressure difference in a particularly simple manner, in particular by adjusting only one parameter, ie the cooling channel pressure.
- a desired surface shape that develops under an arbitrarily predeterminable desired pressure difference can thus be generated in a particularly simple manner by a corresponding adaptation of the actual pressure difference and then measured.
- “measurement environment” means an environment in which there is a preferably definable ambient measurement pressure and in which the optical element is measured and/or operated.
- the cooling channel pressure is adjusted in such a way that the deviation is less than 10 mbar, in particular less than 1 mbar, preferably less than 0.5 mbar.
- the advantage here is that the actual pressure difference is adjusted or adjusted particularly precisely to the target pressure difference.
- the measured surface shape or the surface shape that develops under the actual pressure difference thus corresponds particularly precisely to the surface shape that develops under the setpoint pressure difference.
- the cooling channel is acted upon by a gaseous or liquid coolant, with the pressure on the coolant being increased or reduced in order to adapt the cooling channel pressure.
- the advantage here is that the cooling channel pressure is adjusted or can be adjusted in a particularly simple manner by increasing or reducing the pressure on the coolant itself.
- the pressure on the coolant is increased or decreased hydraulically or pneumatically.
- a controllable hydraulic pump or pneumatic pump is preferably used to hydraulically or pneumatically increase or decrease the pressure on the coolant.
- the adjustment can be made electronically using a controllable electric pump.
- An increase or decrease in the pressure occurs in particular as a function of an increase or decrease in a delivery rate of the corresponding pump, for example by adjusting a speed or delivery speed.
- the coolant flows through the cooling channel at a predefinable flow rate.
- the flow rate that can be predetermined is preferably at least substantially equal to the flow rate at which the coolant flows through the cooling channel, in particular when an EUV lithography system is operating under EUV conditions. This ensures that the flow velocity measurement is performed under EUV conditions.
- the flow rate is selected as a function of a geometry or a cross section of the cooling channel. The flow rate is preferably selected in such a way that a laminar flow forms in the cooling channel. critical See pressure losses as a result of turbulent flows and the resulting vibrations or oscillations of the optical element are thus avoided.
- a dynamic viscosity of the coolant is selected or adjusted in such a way that it is at least essentially the same as that of water, in particular at least 0.89 mPa s and at most 1.52 mPa s.
- the target pressure difference is determined as a function of a specifiable target ambient measurement pressure and a specifiable target cooling duct pressure, with the target ambient measurement pressure being at least 0.01 mbar and at most 0.20 mbar and the target cooling duct pressure being at least 200 mbar and at most 10000 mbar.
- the advantage here is that based on the predefinable or selectable target measurement ambient pressures and target cooling channel pressures, a large number of target pressure differences can be determined or set, which are present when using or operating the optical element, in particular under EUV conditions or may exist.
- the surface shape to be measured or the surface shape formed under the actual pressure difference thus corresponds to a surface shape formed particularly under EUV conditions.
- the target measurement ambient pressure is at least 0.01 mbar and at most 1000 mbar. Provision is preferably made for the setpoint measurement ambient pressure to be 1000 mbar and the setpoint cooling channel pressure to be at least 1200 mbar and at most 10000 mbar.
- the measured surface shape or the surface shape that develops under the actual pressure difference corresponds to a surface shape that develops, in particular, under atmospheric pressure conditions.
- the definable desired measurement ambient pressure is at least 0.03 mbar and at most 0.1 mbar and the desired cooling channel pressure is at least 500 mbar and at most 1000 mbar.
- the setpoint pressure difference is determined on the basis of a particularly narrow setpoint measuring ambient pressure interval and setpoint cooling channel pressure interval.
- a target pressure difference selected from this target measurement ambient pressure interval and target cooling channel pressure interval corresponds to a pressure difference as is usually present when the optical element is used or operated under EUV conditions.
- the predefinable setpoint measurement ambient pressure is 0.05 mbar and the predefinable setpoint cooling channel pressure is 500 mbar.
- this target measurement ambient pressure and this target cooling channel pressure a fixed target pressure difference is specified.
- this firmly determined setpoint pressure difference corresponds to a pressure difference as is usually present when the optical element is used or operated under EUV conditions.
- the measured surface shape or the surface shape formed under the actual pressure difference thus corresponds particularly precisely to the surface shape formed under EUV conditions.
- the invention also relates to a measuring device for measuring a surface shape of an optical element, the optical element having a base body with a substrate and a reflecting surface, and at least one cooling channel for receiving a coolant being formed in the substrate, the measuring device having: i ) a measuring light source; ii) an interferometer, with which a measurement of at least one partial area of a surface of the optical element can be carried out by interferometric superimposition of a test wave produced by the measuring light source and directed onto the optical element and a reference wave; iii) at least one controllable coolant reservoir for storing coolant, and iv) a control device which is designed to carry out the method according to one of claims 10 to 16 when used as intended.
- the coolant has a refractive index that is at least essentially equal to a refractive index of the substrate of the optical element to be tested.
- the cooling channels in particular the walls of the cooling channels, have a predetermined roughness to ensure a diffuse scattering effect.
- the diffuse scattering reduces interfering reflections.
- a dynamic viscosity of the coolant is at least essentially the same as that of water, in particular at least 0.89 mPa s and at most 1.52 mPa s.
- the coolant is a solution of an inorganic or organic substance in water.
- the advantage here is that the refractive index can be variably adjusted, in particular depending on a predeterminable concentration of the substance.
- the substance is, for example, sugar or potassium iodide.
- the substance forms a homogeneous phase when mixed with water.
- homogeneous phase means that the distribution of the substance in the water is the same at every location. This ensures in particular that the refractive index of the coolant is the same at every point in the cooling channel to which coolant is applied.
- the invention also relates to a method for producing an optical element, the optical element having a base body with a substrate and a reflecting surface, and at least one cooling channel for receiving a coolant being formed in the substrate, and the cooling channel being produced by a machining process , In particular drilling, and/or is formed by an etching process.
- the substrate and the reflecting surface are in particular formed in one piece.
- a mirror body has the reflective surface, the substrate and the mirror body having the reflective surface being connected to one another by a joining process, in particular bonding.
- the cooling channel is formed in the substrate in particular by an etching process, by grinding and/or by milling.
- the substrate and the reflecting surface are not formed in one piece.
- the Mirror body and the substrate made of the same material.
- the cooling channel is formed in the mirror body having the reflecting surface, in particular by grinding, milling and/or etching.
- the substrate is preferably polished at least in regions, so that the substrate and the mirror body having the reflecting surface can be or can be connected to one another particularly advantageously by the joining process.
- the joining process is carried out in such a way that the reflecting surface and a boundary layer that forms between the reflecting surface and the substrate as a result of the joining process are not aligned congruently with one another, at least in regions.
- “Not congruent” means that a first tangential plane at a specifiable point of the reflecting surface and a second tangential plane at a specifiable point of the boundary layer are not aligned parallel to one another.
- a normal vector of the first tangential plane and a normal vector of the second tangential plane have a deviation greater than zero from one another.
- the predeterminable point of the reflecting surface and the predeterminable point of the boundary layer are preferably arranged along a straight line, with the straight line being aligned parallel to an optical axis of the optical element.
- the advantage here is that superimposition of the measurement light reflected on the reflecting surface and the measurement light reflected on the boundary layer is avoided in a particularly effective manner.
- a measuring light beam incident on the boundary layer will have an angle of emergence which differs from an angle of emergence of a measuring light beam incident on the reflecting surface.
- the boundary layer that forms has a refractive index that differs from the refractive index of the substrate or of the mirror body having the reflecting surface.
- the reflective surface and the boundary layer can each be designed to be planar, that is to say without curvature, or have a curvature.
- a layer is applied at least in regions to the reflecting surface, which is designed to reflect light with a wavelength of at least 193 nm and at most 633 nm, in particular of at least 532 nm and at most 633 nm.
- the optical element can be measured with high precision using measuring light, i.e. light with a wavelength of at least 193 nm and at most 633 nm.
- the layer or measurement layer prevents the measurement light beam from reaching or being able to reach a boundary layer that forms as a result of the joining process between the reflecting surface and the substrate.
- the layer preferably has at least one silicon layer and/or at least one chromium layer. Provision can advantageously be made for the reflecting surface to be processed by ion beam processing.
- the substrate has a material that is formed in such a way that it absorbs light of a definable wavelength, in particular a wavelength of at least 193 nm and at most 633 nm, in particular at least 532 nm and at most 633 nm.
- the material of the substrate is preferably doped with an absorption-enhancing material.
- the substrate and the reflective surface are formed in one piece. If the substrate and a mirror body having the reflecting surface are connected to one another by bonding, it is preferably provided that the mirror body has the material that is designed to absorb the light of a predetermined wavelength.
- the invention relates to a projection exposure system for semiconductor lithography, having: i) an illumination device; ii) a projection lens and iii) at least one optical element, which has a base body with a substrate and a reflecting surface, wherein at least one cooling channel for receiving a coolant is formed in the substrate.
- the projection exposure system is characterized in that the optical element is produced by a method according to one of Claims 1 to 7.
- Figure 1 is a schematic representation of a measuring device according to an embodiment
- FIG. 2 shows a schematic representation of an optical element according to a first exemplary embodiment
- FIG. 3 shows a schematic representation of an optical element according to a second exemplary embodiment
- FIG. 4 shows a schematic representation of an optical element according to a third exemplary embodiment
- FIG. 5 shows a flow chart for representing a method for measuring a surface shape of an optical element
- FIG. 6 shows a schematic representation of a projection exposure system designed for operation in the EUV.
- FIG. 1 shows a schematic representation of an in particular interferometric measuring device 1 for measuring a surface shape of an optical element 2, in particular of a mirror 3, of a microlithographic projection exposure system.
- the measuring device 1 has at least one measuring light source 4 (not shown here), an interferometer 5 and a coolant reservoir 6 .
- the measuring light source 4 generates measuring light or a measuring light radiation of a specifiable wavelength or several specifiable wavelengths, for example 193 nm, 532 nm and/or 633 nm.
- the measuring light radiation enters the interferometer 5 from an exit surface of an optical waveguide 7 as an input wave 8 with a spherical wave front.
- the interferometer 5 includes, without being limited to this, a beam splitter 9, a diffractive optical element 10 in the form of a complex coded one in particular Computer-generated hologram (CGH) 11, three reflective elements 12, 13, 14, the optical element 2 to be measured and an interferometer camera 15. It is optionally provided that the interferometer 5 comprises fewer or more components than those described. Thus, the interferometer 5 can comprise fewer than three or more than three reflective elements 12, 13, 14, or the measuring light source 4 as well
- the measuring light radiation or input wave 8 passes through the beam splitter 9 and then hits the CGH 11 .
- the CGH 11 In transmission, the CGH 11 generates a total of four output waves from the input wave 8 according to its complex coding, of which one output wave impinges as a test wave on a surface of the optical element 2 to be measured with a wave front adapted to a target shape of the surface of the optical element 2 .
- the CGH 11 generates three further output waves from the input wave 8 in transmission, each of which hits one of the reflective elements 12 , 13 , 14 .
- the elements 12 and 13 are each configured as a plane mirror and the reflective element 14 as a spherical mirror in the exemplary embodiment.
- An optionally provided shutter is denoted by reference number 16 .
- the CGH 11 is also used to superimpose the test wave reflected by the optical element 2 to be measured and the reference waves reflected by the reflective elements 12, 13, 14, which, as convergent beams, hit the beam splitter 9 again and are reflected by it in the direction of the interferometer camera 15 are passing through an eyepiece 17.
- the interferometer camera 15 captures an interferogram generated by the interfering waves, from which an actual shape or the surface shape of the optical element 2 is determined by an evaluation device (not shown).
- the optical element 2 has a base body 18 with a substrate 19 and a reflecting surface 20 , at least one cooling channel 21 (not shown here) for receiving a gaseous or liquid coolant 22 being formed in the substrate 19 .
- the material of the substrate 19 is, for example, a glass material such as quartz glass or a glass ceramic material such as Zerodur®, manufactured by Glaswerke Schott, or ULE® (ultra low expansion) glass manufactured by Coming. Quartz glass has a refractive index of 1.45 at a wavelength of 546.1 nm, ULE® glass has a refractive index of 1.4828 and Zerodur® has a refractive index of 1.5447.
- the measuring device 1 has the coolant reservoir 6 for storing coolant 22 .
- the measuring device 1 additionally has a controllable delivery device 23, in particular a pump 24, connected to the coolant reservoir 6, for delivering the coolant 22 from the coolant reservoir 6 and thus for loading the cooling channel 21 with coolant 22 and/or for pressurizing the coolant 22 .
- the delivery device 23 is preferably a hydraulic pump, pneumatic pump or electric pump.
- the coolant 22 is supplied to the optical element 2, in particular the cooling channel 21, through a supply line 25 connected to the coolant reservoir 6 and removed from the optical element 2, in particular the cooling channel 21, through a discharge line 26 connected to the coolant reservoir.
- the coolant 22 preferably returns to the coolant reservoir 6 through the discharge line 26 in order to be able to be pumped again from there.
- the supply line 25 and the discharge line 26 form a conveying line 27.
- the supply line 25 and the discharge line 26 can each be connected to the optical element 2, in particular designed for a detachable connection.
- the supply line 25 and/or the discharge line 26 can each be designed as a hose with a definable diameter.
- the inlet line 25 and the outlet line 26 are designed in particular in such a way that oscillations or vibrations that can occur during operation of the measuring device 1 , in particular while coolant 22 is being conveyed from the coolant reservoir 6 , are damped or suppressed.
- the optical element 2 is thus not influenced by oscillations and vibrations during the delivery of coolant 22 from the coolant reservoir 6, in particular the optical element 2 itself is not excited to oscillate and vibrate.
- the supply line 25 is, for example, sagging or not taut between the optical element 2 and a sensor 37, in particular a flow sensor, or between the optical element 2 and the pressure detection device 35 or between the optical element 2 and the Output side 32 of the pressure control device 28 is arranged. If the supply line 25 is to be arranged so that it sags, for example between the optical element 2 and the sensor 37, a length of the supply line 25, in particular a length of a supply line section 88 between the optical element 2 and the sensor 37, is selected to be greater than the distance between to ensure sagging optical element 2 and sensor 37 is.
- the derivative 26 is arranged, for example, sagging or not taut between the optical element 2 and the pressure detection device 36 or between the optical element 2 and the pressure control device 34 .
- the coolant 22 is preferably pumped out of the coolant reservoir 6 in such a way that a pressure or cooling channel pressure of at least 200 mbar and at most 10,000 mbar develops in the at least one cooling channel 21 .
- a pressure on the coolant 22 is increased or decreased.
- the pressure is preferably adjusted by adjusting, i.e. increasing or reducing, the delivery rate of the delivery device 23, for example by adjusting the delivery speed of the pump 24.
- a specifiable flow rate or a volume flow at which the coolant 22 flows through the delivery line 27 is preferably set , in particular the cooling channel 21, also by adjusting the delivery rate of the delivery device 23.
- supply line 25 preferably has at least one controllable pressure control device 28, in particular a two-way pressure control valve 29 or three-way pressure control valve 30.
- the pressure control device 28 has an input side 31 assigned to the coolant reservoir 6 and an output side 32 assigned to the optical element 2 or cooling channel 21 .
- the two-way pressure control valve 29 and the three-way pressure control valve 30 are preferably each designed to convert an input-side pressure into a predefinable output-side pressure.
- the three-way pressure control valve 30 is preferably designed to open when a predetermined pressure on the input side 31 is exceeded, so that the pressure on the output side 32 is lower than the pressure on the input side 31.
- the three-way pressure control valve 30 preferably has an overflow outlet 33 which is connected to the coolant reservoir 6, so that when the predefinable pressure on the input side 31 is exceeded, the overflow outlet 33 opens and coolant 22 can be discharged from the pressure control valve 28 and returned to the coolant reservoir 6 .
- the derivation 26 has a further controllable pressure control device 34 . It is optionally provided that the pressure control device 28 can be or is connected directly to the optical element 2 or that the optical element 2 has the pressure control device 28 .
- a pressure detection device 35 for example a pressure sensor or manometer, is preferably located between the pressure control device 28 and the optical element 2, in particular the cooling duct 21 or an inlet side of the cooling duct 21 , arranged.
- a further pressure detection device 36 is optionally provided between the optical element 2 , in particular the cooling channel 21 or an outlet side of the cooling channel 21 , and the further pressure control device 34 .
- a sensor 37 in particular a flow sensor, is preferably arranged between the pressure control device 28 and the optical element 2, in particular the cooling channel 21 or the inlet side of the cooling channel 21, for detecting a flow rate or a volume flow of the coolant 22 in the cooling channel 21.
- the flow rate is determined as a function of the pressures detected by the pressure detection device 35 and the additional pressure detection device 36 .
- the measuring device 1 optionally has a temperature control device 83 connected to the coolant reservoir 6 . Since a dynamic viscosity of the coolant 22 depends on temperature and pressure, the temperature of the coolant 22 is preferably controlled in such a way that the dynamic viscosity of the coolant 22 corresponds to a specifiable dynamic viscosity, in particular that of water, preferably at least 0.891 mPas and at most 1.52 mPas. Optional is the coolant 22 tempered such that a coolant temperature is at least substantially equal to a predetermined temperature, such as an operating temperature of an EUV lithography system. Additionally or alternatively, the pressure on the coolant 22 is adjusted to change the dynamic viscosity. In order to detect a temperature of the coolant 22, the measuring device 1 or the temperature control device 83 preferably has a temperature sensor.
- the measuring device 1 is arranged in a housing 40 enclosing an interior space 38 or a measuring environment 39 , in particular a vacuum chamber 41 .
- At least one controllable vacuum generating unit 42 is assigned to the housing 40 for generating a vacuum in the interior 38 or the measuring environment 39 .
- the vacuum generation unit 42 is preferably designed to generate a vacuum in the housing 40 with a total pressure or measuring ambient pressure of at least 0.01 mbar, in particular less than 0.01 mbar, and at most 0.1 mbar.
- the surface shape of the optical element 2 is or can be measured at an ambient measurement pressure which corresponds to a pressure that is present when the optical element 2 is used, in particular in combination with an EUV lithography system, in an EUV operating vacuum .
- the surface shape is measured at the air pressure that prevails at the location of the measurement, in particular at an atmospheric pressure of 1 bar, or at any specifiable ambient measurement pressure.
- the measuring device 1 preferably has a pressure sensor 43 for detecting the measuring ambient pressure.
- the measuring arrangement 1 is not arranged in the housing 40 or the vacuum chamber 41 .
- the surface shape is then measured at air pressure, in particular atmospheric pressure.
- the measurement environment can then be the interior 38 or another measurement environment, in particular a measurement environment that is not closed by a housing.
- the measuring device 1 has a control device 44 .
- the control unit 44 is specially designed for this purpose, in particular the conveyor device 23 and/or at least one of the pressure control valves 29, 30, in particular the pressure control valve 29, to control.
- control unit 44 is connected to the conveyor device 23, at least one of the pressure control devices 28, 34, the pressure sensor 43, at least one of the pressure detection devices 35, 36, the flow sensor 37 and preferably the measuring light source 4 in terms of signals, in particular by a wire-based data line or wireless data line.
- the coolant 22 preferably has a refractive index that is at least essentially equal to a refractive index of the substrate 19 or the substrate material of the optical element 2 to be measured. This ensures that the optical element 2 can be measured in a particularly advantageous manner, since undesirable back-reflections at an interface between the substrate 19 and the cooling channel 21 are minimized.
- the coolant 22 preferably has an inorganic or organic substance which is preferably miscible with water, in particular forms a homogeneous phase when mixed with water.
- the coolant 22 has a very low or a very high vapor pressure. This ensures in particular that the coolant 22 remains liquid at low pressures or under vacuum pressure conditions.
- the coolant 22 can therefore be removed from the cooling channel 21 easily or with little effort.
- the substance or the coolant 22 is preferably not a hazardous material, ie it can be handled safely and disposed of in an environmentally friendly manner.
- the substance is, for example, sugar, in particular a 79% by weight solution of sucrose with water.
- this sucrose solution is prepared by dissolving sugar in water at at least 70°C and then cooling. This results in a refractive index of 1.483 at a temperature of 20° C., this refractive index corresponding at least essentially to the refractive index of the ULE® glass.
- the substance is potassium iodide, with a refractive index of at least 1.33 (potassium iodide content zero percent) and at most 1.502 (saturated potassium iodide solution) being adjustable depending on a predeterminable proportion of potassium iodide in water.
- the coolant 22 is glycerin (refractive index: 1.474).
- the coolant 22 is a sodium polywolframate solution, with a predeterminable proportion of the substance sodium polywolframate in water Refractive index of at least 1.33 (sodium polytungstate zero percent) and at most 1.55 (saturated sodium polytungstate solution) can be adjusted.
- the following oils or organic substances are provided as coolant 22: tetrahydronaphthalene (refractive index: 1.541), methyl salicylate (refractive index: 1.535) or eugenol (refractive index: 1.541). These refractive indices correspond at least essentially to the refractive index of Zerodur® in particular.
- the refractive index is a function of wavelength and temperature
- a temperature of the measurement environment 39 and the wavelength of the measurement light radiation are preferably taken into account when selecting the coolant 22 or the refractive index of the coolant 22 .
- the measuring light source 4 is designed to emit measuring light radiation of different wavelengths, for example 532 nm and 633 nm
- a first and a second refractive index of the substrate 19 are determined for a respective wavelength and the mean value of the refractive index is formed therefrom. According to the mean value formed, the coolant 22 is then selected in such a way that its refractive index is at least essentially equal to the mean value.
- the refractive index is calculated as a function of an Abbe number of the material of the substrate 19 and the temperature coefficient of the refractive index, which is defined as dn/dT, where n is the refractive index of the substrate 19 and T is the temperature of the measurement environment.
- the refractive index of the substrate 19 is measured, for example by a refractometer, spectrometer, interferometer, or immersion and ellipsometric methods.
- the above-mentioned refractive indices of the respective coolants 22 and substrates 19 or substrate materials are therefore to be understood as examples. Actual refractive indices can deviate from the stated refractive indices, in particular as a function of the wavelength of the measurement light radiation and the temperature of the measurement environment 39 .
- the coolant is a gaseous coolant, for example nitrogen or dry air, ie air with a definable relative humidity, for example less than 40%.
- the liquid coolant is water, for example, in particular ultrapure water.
- FIG. 2 shows a simplified cross-sectional representation of the optical element 2 according to a first embodiment.
- the optical element 2 has the base body 18 with the substrate 19 and the reflecting surface 20 .
- In the substrate 19 is/are at least one cooling channel 21 , in the present case a plurality of cooling channels 21 , 45 , 46 , 47 adjacent to one another, for receiving the coolant 22 .
- the distance between two mutually adjacent cooling channels 21, 45, 46, 47 is preferably at least 1 mm and at most 12 mm.
- the mutually adjacent cooling channels 21 , 45 , 46 , 47 are presently arranged in one plane or cooling channel plane 50 .
- the substrate 19 optionally has at least one further cooling channel level, which is arranged in particular below the cooling channel level 50 .
- At least 20 and at most 200 cooling channels 21 are preferably formed in the substrate 19 .
- a respective cooling channel 21 preferably has a rectangular or circular cross section, with a diameter of the respective cooling channel 21 being at least 0.5 mm and at most 5 mm.
- the cooling channels 21, 45, 46, 47 are designed, for example, in a meandering shape or parallel to one another.
- the distance from the cooling channel 21, in particular an upper cooling channel wall 90 of a respective cooling channel 21, 45, 46, 47, to the reflecting surface 20 is preferably at least 2 mm and at most 30 mm.
- the optical element 2, in particular the substrate 19, has a first and a second connection opening 48, 49, the first and the second connection opening 48, 49 being designed in such a way that the first connection opening 48 with the supply line 25 and the second connection opening 49 can be connected to the derivative 26 or vice versa.
- at least one of the connection openings 48, 49 is designed for a direct connection, that is to say without the interposition of a supply line 25, to the pressure control device 28.
- the cooling channels 21, 45, 46, 47 which are configured or aligned parallel to one another, preferably open into the first connection opening 48 on the one hand and into the second connection opening 49 on the other.
- the distance between the connection openings 48, 49 is preferably at least 50 mm and at most 1000 mm .
- a single-layer or multi-layer reflection layer 51 is preferably applied to the reflecting surface or area 20, which is designed in particular for reflecting measuring light radiation with a wavelength of in particular 193 nm, 532 nm and/or 633 nm. This ensures a reliable reflection of the measuring light Radiation and thus reliable measurement or measurability of the surface shape of the optical element 2.
- the single-layer or multi-layer reflection layer 51 preferably has sputtered chromium and/or silicon, in particular at least one chromium layer and/or a silicon layer.
- the material of the substrate 19 is formed, in particular doped, in such a way that it absorbs the measuring light radiation.
- no reflective layer 51 is applied to the reflective surface or area 20 .
- the cooling channels 21, 45, 46, 47 are or are preferably produced by a machining production process, for example by drilling.
- the substrate 19 and the reflective surface 20 are formed in one piece.
- the optical element 2 optionally has the pressure control device 28 .
- the pressure control device 28 is preferably arranged directly, for example with the interposition of a connecting element such as the supply line 25, or directly, ie directly, on one of the connecting openings 48, 49.
- FIG. 3 shows the optical element 52 according to a second embodiment in a simplified cross-sectional illustration.
- the optical element 52 essentially corresponds to the optical element from FIG reflective surface 20, 54 having mirror body 55 are not integrally formed.
- the structures for forming the cooling channels 56, 57, 58, 59 are preferably introduced or produced by milling, grinding and/or etching, in particular in the substrate 53. After the milling and/or grinding, the substrate 53 or the substrate material is preferably etched.
- the structures of the cooling channels 56, 57, 58, 59 are optionally produced by a laser-based method, for example laser ablation or selective laser etching.
- the substrate 53 is preferably polished at least in regions, so that the substrate 53 and the mirror body 55 having the reflecting surface 20, 54 can be or can be connected to one another particularly advantageously by the joining process.
- the reflective surface 20, 54 or the mirror body 55 having the reflective surface 20, 54 and the substrate 53 are or will be connected, in particular bonded, by a joining process.
- closed cooling channels 56, 57, 58, 59 are formed in particular all around, ie on all sides of the cooling channel.
- the substrate 53 and the reflecting surface 20, 54 or the mirror body 55 having the reflecting surface 20, 54 are preferably made of the same material, in particular of the material of the substrate 53.
- a boundary layer 60 can form as a result of the bonding. Such a boundary layer 60 that forms is shown here.
- the boundary layer 60 typically has a refractive index that differs from the refractive index of the substrate material.
- the optical element 52 preferably has the reflection layer 51 .
- the optical element 52 does not have a reflection layer.
- the substrate material and/or the mirror body 55 is preferably designed, in particular doped, to prevent measuring light radiation from penetrating into the substrate 53 and/or into the mirror body 55 and thus in particular to the boundary layer 60 in such a way that it absorbs the measuring light radiation.
- the material of the boundary layer 60 is doped in such a way that it absorbs light of a definable wavelength, in particular a wavelength of at least 193 nm and at most 633 nm, in particular at least 532 nm and at most 633 nm.
- the cooling channels in particular the walls of the cooling channels, have a predeterminable roughness to ensure a diffuse scattering effect. The roughness is achieved in particular by a corresponding etching process.
- FIG. 4 shows a further optical element 61 in a simplified cross-sectional view, in which the reflecting surface 62 or the mirror body 63 having the reflecting surface 62 and the substrate 64 are connected, in particular bonded, by a joining process.
- the bonding takes place in such a way that the reflective surface 62 and the boundary layer 65 that forms in the process are not aligned congruently with one another, at least in regions.
- “Not congruent” means that a first tangential plane 84 at a specifiable point, in this case point P1, of the reflective surface 62 and a second tangential plane 85 in a specifiable point, in this case point P2, of the boundary layer 65 are not aligned parallel to one another.
- a normal vector of the first tangential plane 84 and a normal vector of the second tangential plane 85 have a deviation greater than zero from one another.
- the reflective surface 62 and the boundary layer 65 that forms are each planar, i.e. without curvature, “not congruent” means that the reflective surface 62 or the first tangential plane 84 and the boundary layer 65 or the second tangent plane 85 are not aligned parallel to each other.
- boundary layer 65 is planar and the reflective surface 62 is curved at least in some areas (or vice versa), as shown here with a broken line, then “not congruent” means that the boundary layer 65 or the second tangential plane 85 and the reflective surface 62, particularly a third tangent plane 86 associated with the curved reflective surface 62 at point P1, are not aligned parallel to each other.
- not congruent means that the tan gential plane at a predeterminable point P2 of the boundary layer and the tangential plane at a predeterminable point P1 of the reflecting surface are not aligned parallel to one another.
- the specifiable point P1 and the specifiable point P2 are preferably arranged along a straight line 87, with the straight line 87 being aligned parallel to an optical axis 89 of the optical element 2, 52, 61.
- a reflective layer is not provided according to this embodiment, but can optionally be provided.
- the substrate 64 and/or the mirror body 63 optionally has a material that is formed in such a way that it absorbs light of a definable wavelength, in particular a wavelength of at least 193 nm and at most 633 nm, in particular at least 532 nm and at most 633 nm .
- the material of the boundary layer 65 is doped in such a way that it absorbs light of a definable wavelength, in particular a wavelength of at least 193 nm and at most 633 nm, in particular at least 532 nm and at most 633 nm.
- FIG. 5 shows a flowchart for carrying out a method for measuring the surface shape of the optical element 2, 52, 61 using the measuring device 1 in a measuring environment 39 according to an exemplary embodiment.
- the method is preferably carried out by the control unit 44.
- the control unit 44 preferably has a microprocessor, in particular for executing a computer program whose program code causes the method described to be carried out, as well as a RAM and a ROM module, wherein preferably data, for example predeterminable target pressures, and programs, for example algorithms, are stored in the ROM module.
- the method is described with reference to only the cooling channel 21 without being limited to this.
- a first step S1 the optical element 2, 52, 61 is provided.
- the cooling channel 21 is acted upon by a liquid or gaseous coolant 22. This is done in particular by controlling the conveyor device 23 connected to the coolant reservoir 6.
- the coolant 22 is or is selected in such a way that the refractive index of the coolant 22 is at least essentially equal to the refractive index of the substrate 19 of the optical element 2, 52, 61.
- a third step S3 the cooling channel pressure is recorded, in particular by the pressure recording device 35.
- a fourth step S4 the measurement ambient pressure is recorded, in particular by pressure sensor 43.
- a sixth step S6 is the actual pressure difference Apis? compared with a target pressure difference Apson.
- the target measuring ambient pressure and the target cooling channel pressure are selected in such a way that the target measuring ambient pressure is at least 0.01 mbar and at most 0.20 mbar and the target cooling channel pressure is at least 200 mbar and at most 10,000 mbar, in particular with the predefinable target Measurement ambient pressure is at least 0.03 mbar and at most 0.1 mbar and the setpoint cooling channel pressure is at least 500 mbar and at most 1000 mbar.
- the target conditions, ie the target cooling channel pressure and the target ambient measurement pressure correspond at least essentially to EUV conditions, ie pressure conditions that are usually present when an EUV lithography system is operated in a vacuum.
- the setpoint cooling channel pressure is selected to be greater than the setpoint measurement ambient pressure, in particular to form an overpressure in the cooling channel 21 to ensure coolant transport.
- the target measurement ambient pressure and the target cooling channel pressure are selected such that the predefinable target measurement ambient pressure is 0.05 mbar and the predefinable target cooling channel pressure is 500 mbar.
- the setpoint measurement ambient pressure preferably corresponds to an ambient pressure, in particular an operating ambient pressure, in an EUV lithography system or a projection exposure system designed for operation in the EUV, in particular a projection exposure system designed as a scanner for semiconductor lithography.
- the setpoint measurement ambient pressure is thus, for example, a setpoint scanner ambient pressure.
- a deviation between the actual pressure difference and the target pressure difference is monitored, and if a deviation between the actual pressure difference and the target pressure difference greater than a specifiable limit value is detected, the cooling duct pressure is adjusted in such a way that the deviation is less than or equal to the predefinable limit value. If the limit value is 10 mbar, for example, and a deviation of more than 10 mbar is detected, the cooling channel pressure is adjusted by activating delivery device 23 and/or at least one of pressure control valves 28, 29 in such a way that the deviation is less than or equal to 10 mbar.
- the deviation is preferably based on the equation
- PK ST PK.SOLL - PM.SOLL + PM ST (2) determined.
- the limit value is preferably less than or equal to 1 mbar, in particular less than or equal to 0.5 mbar, in particular zero bar.
- a predefinable flow rate or a volume flow is set, with which the cooling means 22 flows through the cooling channel 21, also by adjusting the delivery capacity of the delivery device 23.
- a definable flow rate is set, with the measurement of the surface shape taking place at two different actual pressure differences, in particular two different ambient measurement pressures, and then an average value of the measurement results is formed.
- a temperature control device 83 connected to the coolant reservoir 6 is optionally activated for temperature control, in particular for cooling or heating the coolant 22, in particular for setting a predeterminable dynamic viscosity of the coolant 22.
- the surface shape is measured in an eighth step S8.
- the measuring light source 4 and/or at least one component of the interferometer 5 is controlled or activated for this purpose.
- steps S1 to S7 are preferably carried out or repeated during the measurement. If it is recognized that the deviation is greater than the limit value, the measurement is preferably interrupted and only continued when the deviation is less than or equal to the limit value.
- the advantage of the method described is that the surface shape is measured under an actual pressure difference, which corresponds at least essentially to a setpoint pressure difference under EUV conditions. This ensures that a determined measurement result or a determined surface shape of the optical element 2, 52, 61 corresponds to the surface shape that develops or can develop under EUV conditions in particular. This ensures particularly reliable operation of the optical element 2, 52, 61 or of a projection exposure system which has such an optical element 2, 52, 61.
- the measurement can take place under any measurement ambient pressures, for example under atmospheric pressure or vacuum pressure.
- EUV conditions in this case refers to conditions that typically occur during EUV operation of a projection exposure system or EUV lithography filing system available. These conditions relate in particular to the operating measurement ambient pressure, presently defined by the target measurement ambient pressure, and the operating cooling duct pressure, presently defined by the target cooling duct pressure. Optionally, without being limited to this, these conditions additionally relate to the flow rate of the coolant in the cooling channel, the operating temperature of the EUV lithography system and/or the wavelength of the EUV light.
- FIG. 6 shows highly schematically a projection exposure system 66 designed for operation in the EUV or an EUV lithography system in the form of an EUV lithography system, which has at least one optical element 2, 52, 61, which is produced and/or measured in particular in the manner described above became.
- the projection exposure apparatus 66 has an EUV light source 67 for generating EUV radiation, which has a high energy density in an EUV wavelength range below 50 nm, in particular between approximately 5 nm and approximately 15 nm.
- the EUV light source 67 can be embodied, for example, in the form of a plasma light source for generating a laser-induced plasma or as a synchrotron radiation source.
- a collector mirror 68 can be used, as shown in FIG.
- the illumination beam 69 is used to illuminate a structured object M by means of an illumination device 70, which has five reflective optical elements 71 to 75 (mirrors) in the present example.
- the structured object M can be a reflective mask or a reticle, for example, which has reflective and non-reflective or at least less reflective areas for producing at least one structure on the object M.
- the structured object M reflects part of the illumination beam 69 and forms a projection beam path 75, which carries the information about the structure of the structured object M and which is radiated into a projection lens 76, which forms an image of the structured object M or a respective partial area thereof on a substrate W produced.
- the substrate W for example a wafer, has a semiconductor material, for example silicon, and is arranged on a holder, which is also referred to as the wafer stage WS.
- the projection objective 76 has six reflective optical elements 77 to 82 (mirrors) in order to generate an image of the structure present on the structured object M on the wafer W.
- the number of mirrors in a projection objective 76 is between four and ten, but only two mirrors can also be used if necessary.
- the optical element 2, 52, 61 examined within the scope of the invention with regard to its surface shape or pass can be any mirror of the projection exposure system 66, for example the collector mirror 68, one of the mirrors 71 to 75 of the illumination device 70 or a the mirrors 77 to 82 of the projection objective 76.
- at least one of these mirrors is manufactured and/or measured according to the method described above.
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Abstract
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JP2022523060A JP2023548723A (ja) | 2020-10-08 | 2020-10-08 | 製造方法及び測定方法 |
PCT/EP2020/078193 WO2022073610A1 (de) | 2020-10-08 | 2020-10-08 | Herstellungsverfahren und messverfahren |
CN202080072750.3A CN114631042A (zh) | 2020-10-08 | 2020-10-08 | 制造方法和测量方法 |
US18/296,733 US20230243644A1 (en) | 2020-10-08 | 2023-04-06 | Production method and measurement method |
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2020
- 2020-10-08 JP JP2022523060A patent/JP2023548723A/ja active Pending
- 2020-10-08 CN CN202080072750.3A patent/CN114631042A/zh active Pending
- 2020-10-08 WO PCT/EP2020/078193 patent/WO2022073610A1/de active Application Filing
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CN114631042A (zh) | 2022-06-14 |
US20230243644A1 (en) | 2023-08-03 |
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