WO2017157602A1 - Optische vorrichtung für eine lithographieanlage sowie lithographieanlage - Google Patents
Optische vorrichtung für eine lithographieanlage sowie lithographieanlage Download PDFInfo
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- WO2017157602A1 WO2017157602A1 PCT/EP2017/053289 EP2017053289W WO2017157602A1 WO 2017157602 A1 WO2017157602 A1 WO 2017157602A1 EP 2017053289 W EP2017053289 W EP 2017053289W WO 2017157602 A1 WO2017157602 A1 WO 2017157602A1
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- Prior art keywords
- optical device
- contact
- contact element
- sensor
- frame
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70008—Production of exposure light, i.e. light sources
- G03F7/70033—Production of exposure light, i.e. light sources by plasma extreme ultraviolet [EUV] sources
-
- 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
- G03F7/70808—Construction details, e.g. housing, load-lock, seals or windows for passing light in or out of apparatus
- G03F7/70833—Mounting of optical systems, e.g. mounting of illumination system, projection system or stage systems on base-plate or ground
-
- 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
- G03F7/70808—Construction details, e.g. housing, load-lock, seals or windows for passing light in or out of apparatus
- G03F7/70825—Mounting of individual elements, e.g. mounts, holders or supports
-
- 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
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/1822—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors comprising means for aligning the optical axis
- G02B7/1827—Motorised alignment
- G02B7/1828—Motorised alignment using magnetic means
-
- 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
- G03F7/70058—Mask illumination systems
- G03F7/7015—Details of 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
- G03F7/70058—Mask illumination systems
- G03F7/7015—Details of optical elements
- G03F7/70166—Capillary or channel elements, e.g. nested extreme ultraviolet [EUV] mirrors or shells, optical fibers or light guides
-
- 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
- G03F7/70058—Mask illumination systems
- G03F7/702—Reflective illumination, i.e. reflective optical elements other than folding mirrors, e.g. extreme ultraviolet [EUV] illumination systems
-
- 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
- G03F7/70691—Handling of masks or workpieces
- G03F7/70758—Drive means, e.g. actuators, motors for long- or short-stroke modules or fine or coarse driving
Definitions
- the present invention relates to an optical device for a Lithogra- phiestrom and a lithographic system with such an optical Vorrich ⁇ device.
- Microlithography is used to fabricate microstructured devices such as integrated circuits.
- the microlithography phie farming is performed with a lithography system, which has a loading ⁇ lighting system and a projection system.
- the image of an illuminated by the illumination system mask (reticle) is in this case (a silicon wafer, for example) is projected by means of the Pro ⁇ jetechnischssystems was bonded to a photosensitive layer (photoresist) be ⁇ -coated and which is arranged in the image plane of the projection system substrate to the mask pattern on the lichtempfindli ⁇ che coating of the substrate to transfer.
- EUV lithography tools escape ⁇ oped which use light having a wavelength in the range of 0.1 to 30 nm, in particular ⁇ sondere 13.5 nm.
- reflective optics that is, mirrors
- as-yet refractive optics that is, lenses.
- the mirrors may, for example, on a supporting frame (engl .: force frame) Loading consolidates and be at least partially manipulated configured to a BEWE ⁇ supply a respective mirror in up to six degrees of freedom and thus highly accurate positioning of the mirrors to each other, in particular in Pikometer- Area, allow.
- a supporting frame engaging .: force frame
- Loading consolidates and be at least partially manipulated configured to a BEWE ⁇ supply a respective mirror in up to six degrees of freedom and thus highly accurate positioning of the mirrors to each other, in particular in Pikometer- Area, allow.
- weight-force compensating devices based on permanent magnets (English: magnetic gravity compensators) are usually used, as described, for example, in DE 10 2011 088 735 A1.
- the compensation force generated by such sectionskraftkompensationsein- direction acts the weight of the mirror ent ⁇ against and corresponds essentially in magnitude.
- each level - in particular also in vertical direction - on the other hand ge ⁇ controls using so-called Lorentz actuators.
- Lorentz actuators in each case comprises an energizable coil and spaced therefrom a permanent magnet. Together, these generate an adjustable magnetic force to control the movement of the respective mirror.
- Lorentz actuators are described for example in DE 10 2011 004 607.
- sensors may be provided which are provided on a sensor frame. With the help of the sensors , the positioning of the mirrors can be checked and, if necessary, corrected.
- the support frame and the sensor frame are mechanically decoupled from each other. Mechanical decoupling means that no forces, vibrations and / or vibrations are transmitted from the sensor frame to the support frame or vice versa. This can be achieved, for example, by a very soft and / or resilient mounting of the sensor frame .
- end stops may be provided which limit a relative movement of Tragrah ⁇ mens to the sensor frame and form a defined stop.
- a width of a gap provided at the end stop is checked by means of a feeler gauge. End stops that are inaccessible and / or not visible can be difficult or impossible to verify.
- the measurement of the width of the gap can stops at the end alternatively be effected with the use of a feeler gauge without contact with Hil ⁇ fe an air pressure measuring method in which a nozzle is provided in the respective end stop, is passed through the air. Determined via the ⁇ lung pressure of the air can draw conclusions about the width of the gap are ge ⁇ closed.
- an optical device for a lithography system is cege ⁇ represents.
- the optical device includes an optical element, a supporting frame which supports the optical element, a mechanical entkop ⁇ -coupled by the support frame sensor frame, wherein a gap is provided between the support frame and the sensor frame, and a sensor arrangement, which is adapted to receive a Width of the gap to determine contactless.
- the contact element and the contact surface thus fulfill two functions.
- the optical device may be a projection system of the lithography system.
- the projection system can also be called a projection lens.
- the support frame can also be called a force frame and the sensor frame can also be called a sensor frame.
- the optical device may comprise a plurality of optical elements, for example lenses and mirrors. Among them, that the supporting frame carries the optical element is to be understood that the optical element pensations wornen using the above-describedpersskraftkom- and Lorentz actuators to the support frame gekop ⁇ is pelt. In particular, the optical element for positioning or position ⁇ correction of the same is manipulated, that is, adjustable and / or deformable.
- the support frame and / or the sensor frame may be made of a ceramic material or a metallic material.
- the support frame may be made of a non-oxide ceramic, for example of a silicon carbide.
- at least the support frame is made of an electrically conductive material.
- the width of the gap is preferably 100 to 300 ⁇ .
- the support frame on the sensor ⁇ frame and vice versa no or at least negligible oscillations Forces and / or vibrations are transmitted.
- the sensor frame is supported by means of a soft bearing or actuator.
- the sensor frame can be supported by means of very soft spring elements.
- the support frame is grounded.
- the contact element For limiting the relative movement of the support frame relative to the sensor ⁇ frame, the contact element, the contact surface area or selectively kon taktieren ⁇ .
- the contact element is formed of an aluminum-bronze alloy, whereby a high compressive strength can be achieved with low abrasion at the same time.
- the contact surface may be the same one provided on the supporting frame or on the sensor frame end face, which, when it is provided on the support frame ⁇ then, facing the sensor frame and vice versa.
- the contact element and the contact surface are each preferably electrically conductive.
- the width of the gap can be defined as a distance between the contact surface ⁇ and an end face of the contact element.
- the contact element to the transport ⁇ securing of the optical device with respect to the sensor frame or the supporting frame displaceable to tension the support frame with the sensor frame to ver ⁇ .
- a multiplicity of such contact elements and corresponding contact surfaces are provided.
- the contact elements can be moved against the corresponding contact surfaces ⁇ , whereby a tension of the Tragrah ⁇ men and the sensor frame can be achieved. This allows a Trans ⁇ port backup can be achieved.
- the contact elements are moved away from the contact surfaces and the respective width of the gap is determined and, if necessary, adjusted.
- the optical device further comprises a sensor attached to the frame or to the support frame receiving ⁇ element, in which the contact element is accommodated.
- the receiving element may be made for example of a steel material.
- the receiving element preferably has a tubular base section in which the contact element can be received.
- the contact element comprises egg ⁇ NEN contact portion for contacting the contact surface and a base portion received in the shaft portion.
- the on ⁇ pickup element preferably comprises a disc-shaped flange portion terialein Swissig by mass connected to the base portion.
- the flange can by means of fastening elements, such as fastening bolts ⁇ , be firmly connected to the support frame or the sensor frame.
- an insulating element such as a ceramic disc may be provided between the flange portion and the sensor frame or the Flanschab ⁇ section and the support frame. In this way, an electrical insulation of the receiving element and the contact element relative to the sensor frame or the contact frame can be achieved.
- a gap for electrical insulation of the receiving element and the contact element relative to the sensor frame or the support frame is provided between the receiving element and the sensor frame or between the receiving element and the support frame circumferentially around the receiving element.
- the contact element is electrically conductively connected to the receiving element.
- the gap preferably runs completely around the base portion of the receiving element.
- the gap may, for example, have a width of 50 ⁇ m.
- the contact element along a central axis of the receiving element is displaceable relative thereto.
- the contact element is rotationally symmetrical to a central axis thereof.
- the receiving element is rotationally symmetrical to its center axis ⁇ formed.
- the center axis of the contact element and the central axis of the receiving element is arranged collinear with each other.
- the contact element preferably has the cylindrical contact portion and the pin or rod-shaped base portion.
- externally ⁇ tig an external thread is provided on the base portion, which engages positively in a corresponding, provided on the inside of the base portion of the chopele ⁇ ment, internal thread.
- the threads may for example each have a fine thread, in particular a M12xO, 5 "thread, to be.
- This is the contact member by rotation thereof relative to the receiving ⁇ element displaceable.
- the contact element can be relatively by means of a fuse ⁇ nut to be secured.
- the Siche ⁇ approximately nut can be loosened, the contact element can be rotated to the SET ⁇ len of the width of the gap between the contact surface and the contact element then, making it zoom in the receiving element or displaced out this is. It is then possible, after positioning of the contacts ⁇ lements this are again secured by means of the lock nut in the desired posi ⁇ tion.
- other adjustment means such as a piezo actuator, vorgese for displacing the contact element relative to the receiving element be.
- the optical device further comprises a mating contact element having the contact surface.
- the mating contact element may, for example, be plate-shaped or disk-shaped.
- the Jacobkontak ⁇ tele element may be fixedly connected to the support frame or the sensor frame.
- the mating contact element can be screwed to the support frame or to the sensor frame.
- the mating contact element may have a circular geometry.
- the mating contact element is grounded.
- the mating contact element is electrically conductively connected to the sensor frame or the support frame.
- the frame on which the mating contact element is provided grounded.
- the mating contact element can be electrically insulated from the sensor frame or the support frame, wherein the mating contact element is itself grounded in this case.
- the mating contact element has a spring portion which is adapted to deform resiliently upon contact with the contact element.
- the Yukontak ⁇ wick member is cup-shaped and has a tubular base portion end ⁇ side closed by the spring portion.
- a fastening section is provided on the base section, which is firmly connected either to the support frame or to the sensor frame.
- the base portion may further comprise one or more holes which are set to da ⁇ to vent an inside of the counter-contact element.
- the support frame of one of the contact element and the contact surface and the sensor frame on the other of the contact element and the contact surface is provided on the support ⁇ frame or the contact surface is on the support frame and the Kon ⁇ tact element is provided on the sensor frame.
- the sensor assembly is to be rich ⁇ tet, a width of the gap capacitively, optically or inductively to be determined. Because the width of the gap is measured capacitively, optically or inductively, it is possible to use contact measurement methods, for example with the aid of a feeler gauge, and technically complex measuring methods, such as the above-described pressure measuring method can be dispensed with. The width of the gap can be determined reliably even if the gap is not accessible and / or not visible. As a result, the functionality of the lithographic system is always guaranteed.
- the plates of a capacitor Preferably form in the sensor arrangement, in particular two surfaces, of which one is vorgese ⁇ hen to the support frame and the other to the sensor frame, the plates of a capacitor, in particular a plate capacitor.
- the electrical capacitance of the capacitor changes. That is, when moving towards each other or when moving away from each other, the support frame and the sensor frame changes the width of the gap and there ⁇ with the electrically measurable capacitance of the capacitor.
- a change in the width of the gap can be determined.
- a characteristic curve of the capacitor is linearized analog or digital.
- the sensor arrangement thus forms a capacitive distance sensor.
- the contact element and the contact surface together form a capacitor of the sensor arrangement for the capacitive determination of the width of the gap.
- a capacitor is a passive electrical ⁇ MOORISH device with the ability to electric in a DC circuit La ⁇ applications and the related energy statically stored in a electrical field ⁇ rule. The charge stored per voltage is referred to as electrical ⁇ specific capacity and measured in the unit Farad.
- electrical ⁇ specific capacity In an alternating selstrom Vietnamese a capacitor acts as AC resistance with a fre ⁇ quenzcomben impedance value.
- the guard ring capacitor can also be called a guard ring.
- a homogeneous electric field can be achieved with approximately straight field lines between the contact element and the contact surface.
- the determination of the width of the gap can be done so with an accuracy of 10 ⁇ .
- the guard ring capacitor may be annular and attached to the contact portion of the contact element.
- the sensor arrangement for opti ⁇ cal determination of the width of the gap on a confocal sensor wherein be ⁇ preferably the confocal sensor or a part thereof is arranged in an opening in the contact element.
- a confocal sensor means such a sensor, in which the distance measurement is based on the confocal principle, that is to say made use of two beam paths that have a common focal point.
- an eddy current for inductive determination of the width of the gap can be generated in the contact element and / or in the contact surface.
- Such an eddy current sensor is advantageously insensitive to media such as dust in the measuring gap.
- electrical connector is a on the contact element for the electrical connection thereof is provided with a Auswer ⁇ te Rhein the sensor arrangement.
- a cable can be provided between the evaluation device and the contact element .
- the cable has a plug which is releasably inserted into the electrical connector.
- it can be provided on the contact element, an electrical cable, which then, when the contact element is spatially difficult to get away from this and brought to an easily accessible location of the optical device ⁇ .
- the evaluation device can then be used to determine the width of the Slits can be connected with this cable.
- the evaluation device can be connected in succession to all contact elements of the optical device. It can also be provided several evaluation. The evaluation devices are removed again after setting the width of the gap of the optical device.
- the contact element has a spherical- shaped contact section. This can achieve with the contact surface, a point-like con ⁇ tact of the contact element.
- the contact portion may be formed cylindrical with a circular cross-section ⁇ surface and a flat end face. In this way, a surface contact of the contact element with the contact surface can be achieved.
- a lithography system in particular a DUV or EUV lithography apparatus, comprising at least a device as above beschrie ⁇ ben provided.
- EUV stands for "extreme ultraviolet” and refers to a wavelength of the illuminating light between 0.1 and 30 nm.
- DUV stands for "deep Ult ⁇ raviolett” and refers to a wavelength of the working light from 30 to 250 nm.
- FIG. 1A shows a schematic view of an EUV lithography system
- Fig. 1B shows a schematic view of a DUV lithography system
- FIG. 2 shows a schematic sectional view of an embodiment of an optical device for the lithographic system according to FIG. 1A or FIG. 1B.
- FIG. 3 shows an enlarged detail III according to FIG. 2!
- FIG. 5 shows a schematic sectional view of a further embodiment of an optical device for the lithography system according to FIG. 1A or FIG. 1B!
- FIG. 6 shows a schematic sectional view of a further embodiment of an optical device for the lithography system according to FIG. 1A or FIG. 1B!
- 7 shows a schematic sectional view of a further embodiment of an optical device for the lithography system according to FIG. 1A or FIG. 1B;
- FIG. 8 shows a schematic sectional view of a further embodiment of an optical device for the lithography system according to FIG. 1A or FIG. 1B.
- identical or functionally identical elements have the same reference numbers have been provided ⁇ Be, unless otherwise indicated. As far as a reference number present has several reference lines, this means that the corresponding element is present multiple times. Reference lines that point to hidden details are shown in phantom. It should also be noted that the illustrations are not necessarily measured in the figures are ⁇ rod justice.
- Fig. 1A is a schematic view of an EUV lithography apparatus 100A, which includes a beam shaping and illumination system 102 and a projection system 104 ⁇ .
- EUV stands for "extreme ultraviolet” (English: extreme ultra violet, EUV) and denotes a wavelength of the working light between 0.1 and 30 nm.
- the beam-forming and illumination system 102 and the Gii ⁇ onssystem 104 are each in a not shown Vacuum housing provided hen, each vacuum housing is evacuated using an evacuation ⁇ tion device, not shown.
- the vacuum housings are surrounded by a machine room, not shown, in which drive devices are provided for the mechanical method or setting of optical elements. Furthermore, electrical controls and the like may be provided in this engine room.
- the EUV lithography system 100A has an EUV light source 106A.
- EUV light source 106A may be provided, for example, a plasma source or a Synchrot ⁇ ron, which radiation in the EUV range 108A (extreme ultravio- letter range), for example in the wavelength range of 5 to 20 nm, emits.
- the EUV radiation 108A is collimated and the desired operating wavelength is filtered out of the EUV radiation 108A.
- the EUV radiation 108A produced by the EUV light source 106A has relatively low air transmissivity, and therefore the beam guiding spaces in the beamforming and illumination system 102 and in the projection system 104 are evacuated.
- the EUV radiation is 108A on a photomask (engl .: reticle) 120 passed.
- the photomask 120 is likewise designed as a reflective optical element and can be arranged outside the systems 102, 104. Further, the EUV radiation 108A can be directed to the photomask 120 by means of a Spie ⁇ gels 122nd
- the photomask 120 has a structure which is reduced in size by means of the projection system 104 onto a wafer 124 or the like.
- the projection system 104 (also referred to as a projection objective) has six mirrors M 1 to M 6 for imaging the photomask 120 onto the wafer 124.
- individual mirrors M1 to M6 of the projection system 104 may be arranged symmetrically with respect to an optical axis 126 of the projection system 104.
- the An ⁇ number of mirror Ml is not limited to the DAR Asked number to M6 of the EUV lithography system 100A. It is also possible to provide more or fewer mirrors M1 to M6.
- the mirrors M1 to M6 are usually curved at their front for beam shaping.
- FIG. 1B shows a schematic view of a DUV lithography system 100B comprising a radiation shaping and illumination system 102 and a projection system 104.
- DUV stands for "deep ultraviolet” (English: deep ultraviolet, DUV) and denotes a wavelength of the working light between ⁇ 30 and 250 nm.
- the beam-forming and illumination system 102 and the projection system 104 may - as already with reference to FIG. 1A described- arranged in a vacuum housing and / or surrounded by a machine room with corresponding drive devices.
- the DUV lithography system 100B has a DUV light source 106B.
- a DUV light source 106B for example, an ArF excimer laser can be provided, which radiation 108B in the DUV range, for example, 193 nm emit ⁇ advantage.
- the beamforming and illumination system 102 shown in FIG. 1B directs the DUV radiation 108B onto a photomask 120.
- the photomask 120 is formed as a transmissive optical element and may be disposed outside of the systems 102, 104.
- the photomask 120 has a structure which is reduced by means of the projection system 104 onto a wafer 124 or derglei ⁇ chen is imaged.
- the projection system 104 has a plurality of lenses 128 and / or mirrors 130 for imaging the photomask 120 onto the wafer 124.
- individual lenses 128 and / or mirrors 130 of the projection system 104 may be arranged symmetrically to egg ⁇ ner optical axis 126 of the projection system 104.
- the number of lenses 128 and mirrors 130 of the DUV lithography system 100B is not limited to the number shown. Also, more or less lenses 128 and / or mirrors 130 may be provided. Furthermore, the mirrors 130 are typically curved at their front for beam shaping.
- FIG. 2 shows a highly simplified schematic sectional view of an optical device 200A for a respective lithography apparatus 100A, 100B ge ⁇ Wegss Figs. 1A and IB.
- FIG. 3 shows a detailed view III according to FIG. 2. In the following, reference is made to FIGS. 2 and 3 at the same time.
- the optical device 200A may be a projection system 104 as shown in FIGS.
- the optical device 200A comprises an optical element 202.
- the optical element 202 may be one of the mirrors M1 to Act M6 and 130 or one of the lenses 128, which were described together ⁇ menhang with FIGS. 1A and 1B.
- the optical element 202 may also be an optical grating or a ⁇ -plate.
- the optical device 200A may include a plurality of such optical elements 202.
- the optical device 200A includes a force frame or support frame 204 to which the optical element 202 is coupled.
- a force frame or support frame 204 for supporting the optical ⁇ rule element 202 to the support frame 204 canntonkompensati- ons boots be used on the basis of permanent magnets.
- the compensation force generated by such a weight-force compensation device counteracts the weight force of the optical element 202 and accordingly accounts for it substantially in terms of magnitude.
- a movement of the optical element 202 - in particular in the vertical direction - on the other hand be controlled by means of so-called Lorentz actuators.
- Lorentz actuators in each case comprises an energizable coil as well as a permanent magnet spaced therefrom. Together, these generate an adjustable magnetic force for controlling the movement of the optical element 202.
- the optical element 202 can be manipulated for positioning or position correction thereof, in particular adjustable and / or deformable.
- one or more actuators in particular Lorentz actuators, may be provided.
- the support frame 204 may carry a plurality of such optical elements 202.
- the support frame 204 may be made of a ceramic material.
- the support frame 204 may be made of a non-oxide ceramic, for example a silicon carbide (SiC / SiSiC).
- SiC / SiSiC silicon carbide
- the support frame 204 is made of an electrically conductive material.
- the optical device 200A further comprises a sensor frame or sensor frame 206 mechanically decoupled from the support frame 204.
- the sensor Sorrahmen 206 may also be made of a ceramic material, such as silicon carbide, or made of a steel material.
- On the sensor frame 206 a plurality of sensors may be provided which are adapted to detect the positi ⁇ on réelle of the optical element 202 and the optical elements 202. With the aid of the determined by the sensors position of the optical element 202 ⁇ rule whose alignment can be corrected by means of provided at the supporting frame 204 actuators.
- the optical device 200A further includes a sensor assembly 208 configured to detect a width b2io of a gap 210 between the support frame 204 and the sensor frame 206.
- the width b2io is preferably 100 to 300 ⁇ .
- the sensor arrangement 208 is set up to ascertain the width b2io capacitively. That is, the sensor assembly 208 forms a capacitive ⁇ tive sensor.
- a capacitive sensor operates based on a change in the capacitance of a single capacitor or a whole capacitor system.
- the sensor assembly 208 includes an opening provided on the supporting frame 204 contact surface 212.
- the contact surface 212 may be a sensor frame 206 to ⁇ facing end face of the support frame 204th
- the contact surface 212 is geer ⁇ det.
- the contact surface 212 is electrically conductively connected to a ground 214.
- the ground 214 provides an electrically conductive connection of the
- the sensor arrangement 208 comprises, in addition to the contact surface 212, a contact element 216.
- the contact element 216 is provided on the sensor frame 206.
- the contact element 216 may also be on the support frame 204 and the contact surface 212 may be provided correspondingly on the sensor frame 206. In the following, however, it is assumed that the contact element 216 is arranged on the sensor frame 206.
- the contact element 216 may also be referred to as an end stop.
- the contact element 216 comprises a cylindrical contact portion 218 with an end face 220.
- the contact portion 218 may be a circular
- the front side 220 may be flat.
- the width b2io is de ⁇ finiert than the distance between the contact surface 212 and the end face 220 of the contact element 216.
- the contact element 216 includes a multi-stage and integrally formed with the contact portion 218 shaft portion 222.
- the shaft portion 222 and the Maisab ⁇ cut 218 are preferably formed rotationally symmetrical to a symmetry or center axis M216 of the contact element 216.
- the contact element 216 and at least the contact portion 218 are made of an aluminum-bronze alloy. This results in a high pressure and abrasion resistance. As a result, the occurrence of metallic abrasion upon contact of the contact portion 218 with the contact surface 212 is reliably prevented.
- the shank portion 222 has four shades 224, 226, 228, 230. In particular, the shank portion 222 has a first step 224, a second step 226, a third step 228, and a fourth step 230.
- An outer diameter of the contact portion 218 is larger than an outer ⁇ diameter of the first step 224, whose outside diameter is, in turn RESIZE ⁇ SSER than an outer diameter of the second step 226, the outer ⁇ diameter is in turn greater than an outer diameter of the third step 228, the Diameter in turn is greater than an outer diameter of the fourth gradation 230.
- an external thread 232 is provided at the first step 224.
- the outer ⁇ thread 232 is preferably a fine thread.
- a fine thread has Ver ⁇ equal to a standard thread a narrower thread profile.
- the external thread 232 may be for example a M12xO, 5 "thread.
- the second step 226 follows, which has no male thread and thus is externally smooth.
- an Au ⁇ male thread 234 is again provided.
- the external thread 234 may be a Ml 0x1, 5 thread
- the fourth step 230 is again outside smooth-walled, that is, it has no thread.
- the optical device 200A includes a receiving member 236 mounted on the support frame 204 or the sensor frame 206 for receiving the contact member 216. As shown in FIGS. 2 and 3, the receiving member 236 may be provided on the sensor frame 206.
- the receiving element 236 comprises a tubular or sleeve-shaped base portion 238 in which the Schaftab ⁇ section 222 of the contact element 216 is received.
- the receiving element 236 may be made of a steel material.
- An inner diameter of the base portion 238 is at least slightly larger than the outer diameter of the second step 226 of the shaft portion 222 of the contact element 216.
- the receiving element 236 is opposite to the sensor frame 206 electrically iso ⁇ lines.
- an internal thread 240 corresponding to the external thread 232 of the shaft section 222 of the contact element 216 can be provided on the inside of the base section 238, an internal thread 240 corresponding to the external thread 232 of the shaft section 222 of the contact element 216 can be provided.
- the external thread 232 and the internal thread 240 are optional.
- the contact element 216 along a central axis M236 of the receiving element 236 can be displaced relative thereto.
- the central axis M236 is arranged coaxially with the central axis M216.
- another Einrich ⁇ tung for example, a piezoelectric actuator, for moving the contact element.
- the receiving member 236 further includes an integrally with the Basisab ⁇ section 238 flange portion 242 formed on.
- the flange portion 242 is disk-shaped and runs around the base portion 238. Between the flange portion 242 and an end face 244 of the sensor frame 206, an electrically insulating ceramic disk 246 is positioned.
- the flange portion 242 preferably has a plurality of bores 248, through the fixing ⁇ screw 250 for fixing the receiving member 236 on the Sensorrah ⁇ men 206 are performed.
- the bores 248 can be distributed uniformly over a circumference of the flange portion 242.
- the mounting screws 250 may be, for example, cylinder head bolts with a M6xl, 0 thread.
- the fixing screws 250 are compared to the Flanschab ⁇ section 242 electrically isolated so that the receiving element 236 and thus also the contact element 216 is connected ver ⁇ not electrically connected with the sensor frame 206th
- the contact element 216 is clamped by means of a lock nut 252 to the up ⁇ pickup element 236th
- the locking nut 252 has an internal thread ⁇ de 254 which engages positively in the external thread 234 of the shaft portion 222 of the contact ⁇ element 216.
- a washer 258 is arranged ⁇ .
- the washer 258 may be a steel disc.
- a gap 260 is provided to electrically isolate the receiving element 236 and thus also the contact element 216, as already mentioned above, relative to the sensor frame 206.
- the contact portion 218 of the Kontak ⁇ telements 216 is partially disposed within the sensor frame 206, but with the aid of the gap 260 against this electrically isolated.
- the gap 260 may have a width of 50 ⁇ .
- the contact portion 218 projects at a distance beyond a b2is the Tragrah ⁇ 204 men facing end face 262 of the sensor frame 206 on this.
- the distance b2is is adjustable. The distance b2is can be adjusted by the ⁇ that first the lock nut 252 is loosened or removed.
- On closing ⁇ the contact element 216 can be rotated, which increases depending on the direction of rotation by means of the external thread 232 of the contact element 216 and the internal thread 240 of the receiving element 236, the distance b2is and thus reduces the width b2io of the gap or the distance b2is reduced and thus the width b2io of the gap 210 can be increased.
- the lock nut 252 is tightened again to fix in the desired position, the contact element 216th In an end position in which a minimum distance b2is a maximum width or b2io of the gap 210 is ⁇ provides, is a front side at 264, the contact portion 218 of the Mixele ⁇ ments 216 on an end face 266 of the base portion 238 of theracele ⁇ ments 236th
- the contact element 216 and in particular the contact section 218 may contact the contact surface 212 for limiting a relative movement of the support frame 204 relative to the sensor frame 206. That is, the contact element 216 may abut against the contact surface 212.
- a contact between the contact element 216 and the contact surface 212 may occur, for example, with star ⁇ ken vibrations, vibrations or tilting of the optical device 200A. This may occur, for example, during transport of the optical device 200A.
- the USAGE ⁇ dung an aluminum bronze alloy for the contact element 216 further reliably prevents the generation of metallic wear when the contacts ⁇ lement 216 contacts the contact surface 212th
- the contact element 216 can also be used to secure the transport of the optical device 200A.
- the contact element 216 is displaced with respect to the receiving element 236 until it rests against the contact surface 212.
- the contact element 216 and the contact surface 212 together form an electrical capacitor 268, in particular a plate capacitor, the sen ⁇ soran onion 208.
- the contact surface 212 and the contact element 216 form the electric capacitor 268, wherein the capacitance of the capacitor 268 determined by the width b2io of the gap is.
- the contacts ⁇ lement form 216, more precisely the front side 220, and the contact surface 212 of two oppositely disposed plates of a plate capacitor.
- a characteristic curve of the capacitor 268 is ana ⁇ log or digitally linearized.
- an electric field is formed whose field lines 270 are shown schematically.
- the field lines 270 are curved.
- an inductive or optical measurement may also be carried out:
- the movement of the contact element 216 relative to the contact surface 212 leads to the induction ⁇ tion of an eddy current in the contact element 216.
- This eddy current is detected.
- the width b2io of the gap 210 is determined.
- a confocal or another optical sensor 208a could be arranged in an opening 208b of the contact element 216 (in particular in the form of a bore), as indicated schematically in FIG. At the contact surface 212, a corresponding optical measuring beam could be generated or reflected back.
- a force F216 introduced upon contact of the contact element 216 with the contact surface 212 into the contact element 216 is introduced into the sensor frame 206 via the contact element 216, the receiving element 236 and the fastening screws 250.
- the introduction of force is shown in FIG. 3 with the aid of an arrow 272.
- an electric Plug connector 276 may be provided for electrically connecting the contact element 216 with an off ⁇ values means 278th
- the evaluation device 278 is configured to evaluate signals of the capacitor 268 and to output the current width b2io.
- the optical device 200A may include the evaluation device 278.
- the evaluation device 278 has a connecting line or a cable 280, on the end of which a plug 282 for electrical connection to the plug connector 276 is provided.
- the cable 280 may remain, for example, when the contact element 216 is difficult to access to the contact element 216 or to the sensor frame 206.
- a separable connector 284 may be provided on the cable 280, which is connected via a further cable 286 to the evaluation device 278.
- the width b2io can thus be checked prior to starting up the opti ⁇ cal device 200A and optionally, as described above, adjusted by means of a displacement of the contact element 216 relative to the receiving element 236.
- the width is b2io after setting the same 100 to 300 ⁇ . This allows a mechanical shear ⁇ short circuit between the support frame 204 and the sensor frame 206, that is, a contacting contact between the contact surface 212 and the contact element 216 during operation of the optical device 200A reliably prevented ⁇ .
- a manual measurement of the width b2io for example by means of a feeler gauge, is dispensable.
- the width b2io is reliable and easy to determine even if the gap 210 is not accessible and not visible. Furthermore, a reliable transport ⁇ assurance of the optical device 200A can be achieved with the aid of the contact element 216.
- FIG. 4 shows a greatly simplified schematic plan view of the optical device 200A.
- a plurality of such sensor arrays 208 may be provided on the optical device 200A.
- the sensor frame 206 is not shown in FIG. 4.
- FIGS. 2 to 4 further show a respective coordinate system with a .pi. Axis x, a y axis y and a z axis z.
- a fixation of the Tragrah- mens 204 to the sensor frame 206 or vice versa x and the y-axis y spanned in an x-axis of the plane can be achieved.
- Fig. 5 shows another embodiment of an optical device 200B.
- the optical device 200B of FIG. 5 differs from the optical see apparatus 200A shown in FIGS. 2 to 4 only in that on the Kon ⁇ clock element 216 and in particular at the contact portion 218 of contacts ⁇ lements 216, a guard ring or Guard ring capacitor 288 is provided for Feldabschir ⁇ tion.
- the guard ring capacitor 288 orbits the contact portion 218 annularly.
- the electric field can be shielded so that the field lines 270 are positioned substantially perpendicular to the end face 220 of the contact section 218 of the contact element 216.
- the measurement accuracy can be significantly improved.
- Gaps are adjusted to an accuracy of 10 ⁇ .
- the functionality the optical device 200B otherwise corresponds to the functionality of the op ⁇ tables apparatus 200A.
- Fig. 6 shows another embodiment of an optical device 200C.
- the optical device 200C of FIG. 6 only in that the optical device 200C corresponding to the contact member 216 counter-contact element comprises 290 having the contact surface 212 is different from the pre ⁇ device 200A of FIG. 2 to 4.
- the mating contact element 290 may, for example, be screwed, glued or tied to the support frame 204.
- the contact element 290 is made ge ⁇ from a metallic material.
- the counter-contact element 290 may in particular be made of a titanium-aluminum alloy.
- the mating contact element 290 is plate-shaped.
- the mating contact element 290 may be circular.
- the contact element 290 is either electrically conductively connected to the Tragrah ⁇ men 204 and so grounded via the ground 214, or the Gegenkontak ⁇ wick member 290 is relative to the supporting frame 204 is electrically insulated and has a dedicated ground 292.
- the optical device 200C may further include the field shield protection ring capacitor 288 shown in FIG. The functionality of the optical device 200C otherwise corresponds to the functionality of the optical device 200A.
- Fig. 7 shows another embodiment of an optical device 200D.
- the optical device 200D of FIG. 7 differs from the optical see device 200C of FIG. 6 only by an alternative Ausgestal ⁇ processing of the counter-contact element 290.
- the contact element 290 is in the embodiment of the optical device 200D of FIG. 7 not designed as a solid plate, but includes a spring portion 294, which is adapted to deform elastically in contact with the contact element 216.
- the spring section 294 is in particular a leaf spring.
- the mating contact element 290 is cup-shaped and comprises, in addition to the Federab ⁇ section 294 a tubular base portion 296 which is closed in the direction of the sensor ⁇ frame 206 of the spring portion 294 frontally.
- an annular circumferential mounting portion 298 is provided, which is fixedly connected to the support frame 204.
- At least one or more holes 300 may be provided on the base portion 296 to break them. With the aid of the bore 300 or the holes 300, an interior 302 of the mating contact element 290 can be vented during evacuation of the optical device 200D. As a result, an undesirable deformation of the mating contact element 290 is prevented.
- the optical device 200D may include the field shield protection ring capacitor 288 shown in FIG. The functionality of the opti ⁇ rule apparatus 200D otherwise corresponds to the functionality of the optical device 200A.
- Fig. 8 shows another embodiment of an optical device 200E.
- the optical device 200E differs from the optical device 200A according to FIGS. 2 to 4 only in that the contact section 218 of the contact element 216 is convex on the front side, not flat but, in particular spherical. That is, the end face 220 is spherical or Kugelkalottenförmig. This can achieve a point contact with the end face 220 of the Needlesflä ⁇ che 212th
- the width b2io of the gap 210 is then defined as a distance of the contact surface 212 to one of the contact surface 212 at the next lie ⁇ ing foremost point of the end face 220th
- the optical device 200E according to the Fig. 8 may comprise the in Fig. 5 shown guard ring capacitor 288 to field shield that shown in Fig. 6 Ge ⁇ genumbleelement 290 or the contact element 290 shown in Fig. 7.
- the functionality of the optical device 200E otherwise corresponds to the functionality of the optical device 200A.
- the invention was the basis of preferred embodiments be ⁇ wrote, it is by no means limited to, but varied modifi ⁇ ible.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020187029150A KR20180125504A (ko) | 2016-03-14 | 2017-02-14 | 리소그래피 시스템용 광학 디바이스, 및 리소그래피 시스템 |
US16/124,738 US10168619B1 (en) | 2016-03-14 | 2018-09-07 | Optical device for a lithography apparatus, and lithography apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102016204143.6A DE102016204143A1 (de) | 2016-03-14 | 2016-03-14 | Optische Vorrichtung für eine Lithographieanlage sowie Lithographieanlage |
DE102016204143.6 | 2016-03-14 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US16/124,738 Continuation US10168619B1 (en) | 2016-03-14 | 2018-09-07 | Optical device for a lithography apparatus, and lithography apparatus |
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WO2017157602A1 true WO2017157602A1 (de) | 2017-09-21 |
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PCT/EP2017/053289 WO2017157602A1 (de) | 2016-03-14 | 2017-02-14 | Optische vorrichtung für eine lithographieanlage sowie lithographieanlage |
Country Status (4)
Country | Link |
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US (1) | US10168619B1 (de) |
KR (1) | KR20180125504A (de) |
DE (1) | DE102016204143A1 (de) |
WO (1) | WO2017157602A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102017203079A1 (de) * | 2017-02-24 | 2018-08-30 | Carl Zeiss Smt Gmbh | Lithographieanlage und verfahren |
JP6880508B2 (ja) * | 2017-10-02 | 2021-06-02 | オムロン株式会社 | センサヘッド |
DE102018200524A1 (de) * | 2018-01-15 | 2019-07-18 | Carl Zeiss Smt Gmbh | Projektionsbelichtungsanlage für die Halbleiterlithographie mit verbesserter Komponentenjustage und Justageverfahren |
DE102021202893A1 (de) | 2021-03-24 | 2022-09-29 | Carl Zeiss Smt Gmbh | Lagerung für eine lithographieanlage und lithographieanlage |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030010902A1 (en) * | 2001-07-14 | 2003-01-16 | Carl-Zeiss Semiconductor Manufacturing Technologies Ag | Optical system with a plurality of optical elements |
JP2005166996A (ja) * | 2003-12-03 | 2005-06-23 | Nikon Corp | 基板処理装置及びデバイスの製造方法 |
DE102011004607A1 (de) | 2011-02-23 | 2012-01-12 | Carl Zeiss Smt Gmbh | Vorrichtung zur Gewichtskraftkompensation eines optischen Bauteils, Aktuator und Lithographievorrichtung |
US20120154774A1 (en) * | 2010-12-21 | 2012-06-21 | Carl Zeiss Smt Gmbh | Lithographic Apparatus and Device Manufacturing Method |
DE102011088735A1 (de) | 2010-12-20 | 2012-06-21 | Carl Zeiss Smt Gmbh | Anordnung zur Halterung eines optischen Elementes, insbesondere in einer EUV-Projektionsbelichtungsanlage |
DE102012212503A1 (de) * | 2012-07-17 | 2014-01-23 | Carl Zeiss Smt Gmbh | Lithographieanlage und verfahren |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009034166A1 (de) * | 2008-08-11 | 2010-02-18 | Carl Zeiss Smt Ag | Kontaminationsarme optische Anordnung |
-
2016
- 2016-03-14 DE DE102016204143.6A patent/DE102016204143A1/de not_active Ceased
-
2017
- 2017-02-14 WO PCT/EP2017/053289 patent/WO2017157602A1/de active Application Filing
- 2017-02-14 KR KR1020187029150A patent/KR20180125504A/ko unknown
-
2018
- 2018-09-07 US US16/124,738 patent/US10168619B1/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030010902A1 (en) * | 2001-07-14 | 2003-01-16 | Carl-Zeiss Semiconductor Manufacturing Technologies Ag | Optical system with a plurality of optical elements |
JP2005166996A (ja) * | 2003-12-03 | 2005-06-23 | Nikon Corp | 基板処理装置及びデバイスの製造方法 |
DE102011088735A1 (de) | 2010-12-20 | 2012-06-21 | Carl Zeiss Smt Gmbh | Anordnung zur Halterung eines optischen Elementes, insbesondere in einer EUV-Projektionsbelichtungsanlage |
US20120154774A1 (en) * | 2010-12-21 | 2012-06-21 | Carl Zeiss Smt Gmbh | Lithographic Apparatus and Device Manufacturing Method |
DE102011004607A1 (de) | 2011-02-23 | 2012-01-12 | Carl Zeiss Smt Gmbh | Vorrichtung zur Gewichtskraftkompensation eines optischen Bauteils, Aktuator und Lithographievorrichtung |
DE102012212503A1 (de) * | 2012-07-17 | 2014-01-23 | Carl Zeiss Smt Gmbh | Lithographieanlage und verfahren |
Also Published As
Publication number | Publication date |
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KR20180125504A (ko) | 2018-11-23 |
US10168619B1 (en) | 2019-01-01 |
DE102016204143A1 (de) | 2017-09-14 |
US20190004431A1 (en) | 2019-01-03 |
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