WO2019057696A1 - Wafer-halteeinrichtung sowie mikrolithographische projektionsbelichtungsanlage - Google Patents
Wafer-halteeinrichtung sowie mikrolithographische projektionsbelichtungsanlage Download PDFInfo
- Publication number
- WO2019057696A1 WO2019057696A1 PCT/EP2018/075173 EP2018075173W WO2019057696A1 WO 2019057696 A1 WO2019057696 A1 WO 2019057696A1 EP 2018075173 W EP2018075173 W EP 2018075173W WO 2019057696 A1 WO2019057696 A1 WO 2019057696A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mask
- exposure apparatus
- projection exposure
- holding device
- wafer
- Prior art date
Links
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
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/7085—Detection arrangement, e.g. detectors of apparatus alignment possibly mounted on wafers, exposure dose, photo-cleaning flux, stray light, thermal load
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/38—Masks having auxiliary features, e.g. special coatings or marks for alignment or testing; Preparation thereof
- G03F1/44—Testing or measuring features, e.g. grid patterns, focus monitors, sawtooth scales or notched scales
-
- 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
- G03F7/70308—Optical correction elements, filters or phase plates for manipulating imaging light, e.g. intensity, wavelength, polarisation, phase or image shift
-
- 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
- G03F7/706—Aberration measurement
-
- 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
- G03F7/70605—Workpiece metrology
- G03F7/70653—Metrology techniques
- G03F7/70666—Aerial image, i.e. measuring the image of the patterned exposure light at the image plane of the projection system
-
- 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
- G03F7/70716—Stages
-
- 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
- G03F7/70716—Stages
- G03F7/70725—Stages control
Definitions
- Wafer holding device as well
- the invention relates to a wafer holding device for holding a wafer during operation of a microlithographic projection exposure apparatus, and to a microlithographic projection exposure apparatus.
- Microlithography is used to fabricate microstructured devices such as integrated circuits or LCDs.
- the microlithography process is carried out in a so-called projection exposure apparatus which has an illumination device and a projection objective.
- anamorphic imaging system in which case an anamorphic image is understood to be an image that produces a distorted image of the object , which is not a similarity image (ie can not be represented by a combination of displacement, rotation, mirroring, and centric stretching.)
- an anamorphic imaging system may be, for example, a projection objective which is along two of has different imaging scales in different axes.
- a determination of wavefront errors of the projection lens can be done via shearing interferometry.
- a measuring mask arranged in the object plane of the projection lens to be measured is matched to one another in the form of a two-dimensional shear grating and a diffraction grating arranged in the image plane of the projection lens such that when the measuring mask is imaged onto the diffraction grating, a superimposition pattern in the form of an interferogram arises which is spatially resolving Detector is detected and evaluated.
- a problem encountered in determining the distortion and wavefront errors of the projection lens in practice is that known Measuring arrangements, which, for example, have a sensor arrangement which can be moved into the area of the wafer table, have only insufficient absolute accuracy, with the result that, for example, the manufacturing errors on the part of the measuring technique used result directly in measurement errors.
- the measurement signals obtained in the above moire measurement are also influenced by manufacturing errors of the first grating containing the test structures and / or the second grating forming the moire mask, resulting in a need for appropriate calibration.
- the implementation of a so-called calibration method is known, in which - as indicated in Fig.
- a measurement of the test object or projection lens 606 takes place in a plurality of different measuring positions, which with respect to the positioning of the test object relative to the measuring system or the Grid arrangement of first grid 605 and second grid 608 differ from each other. In principle, this makes it possible to separate the respective components of the test object from the components of the measuring system in the measurement signals obtained or the evaluation result obtained in the detection plane.
- optical imaging properties of a projection exposure apparatus are subject to changes over time due to drift effects, radiation-induced heating and the associated deformation of the optical components (in particular mirrors) as well as alteration of existing layers due to contamination or delamination. that also the above mentioned distortion as well Change the wavefront error of the projection lens over the life of the projection exposure tool.
- a wafer holding device for holding a wafer in the operation of a microlithographic projection exposure apparatus and a microlithographic projection exposure apparatus, which provide a measurement of distortion and / or wavefront errors with increased accuracy and possibly also in anamorphic Allow imaging systems to at least partially avoid the problems described above.
- the invention relates to a wafer holding device for holding a wafer during operation of a microlithographic projection exposure apparatus, with at least one sensor positionable in different rotational positions.
- the at least one sensor has at least one line grating for distortion measurement.
- the at least one sensor has at least one two-dimensional shear grating for wavefront measurement.
- the at least one sensor has at least one ptychography mask.
- a complex shaped grid can be used to generate a complex interferogram, to allow a low-noise inference back to the wavefront.
- the at least one sensor has at least one areally measuring intensity detector.
- the invention relates to a microlithographic projection exposure apparatus having an illumination device and a projection objective, wherein the illumination device is designed to illuminate a mask having an imaging structure arranged in an object plane of the projection objective during operation of the projection exposure apparatus.
- the projection lens is adapted to image this object plane to an image plane; and wherein the projection exposure apparatus comprises a wafer holding device with the features described above.
- the invention further relates to a microlithographic projection exposure apparatus with a lighting device and a projection objective, wherein the illumination device is designed to illuminate a mask having structures to be imaged arranged in an object plane of the projection lens during operation of the projection exposure apparatus, wherein the projection objective is designed to image this object plane onto an image plane;
- At least one in the image plane translationally movable turntable is provided, via which a sensor group can be positioned in different rotational positions in the beam path; and - wherein the at least one turntable translatable in the image plane is arranged on a wafer holding device provided for holding a wafer.
- the direct attachment of the turntable according to the invention to the wafer holding device has the advantage that a comparatively fast or frequent execution of the wavefront and / or distortion measurement is made possible.
- the invention includes the concept of implementing cascading (in the sense of a series connection or concatenation) of a "translation table” to enable translational displacement and a turntable (to allow rotation) in the projection exposure apparatus (in particular for wavefront or distortion measurement) suitable, structurally strong measuring mask instead of the actual (lithographic) mask in
- a suitable detector and evaluation unit eg, a moire grid for distortion measurement or a two-dimensional shear grid for wave front measurement in conjunction with a detector, for example in the form of a CCD camera
- the incident light is structured in a targeted manner via the measuring mask, this structure is imaged onto the detector and the imaged structure is correspondingly observed.
- the inventive design of a projection exposure apparatus can take account of the fact that in practice the optical imaging properties of the projection exposure system due to drift effects, radiation-induced heating and concomitant deformation of the optical components (especially mirrors) and change existing layers by contamination or Schichtabtrag temporal changes subject.
- the wavefront and / or distortion measurement can be carried out repeatedly over the lifetime of the projection exposure apparatus.
- the rotation which can be implemented in the construction according to the invention furthermore makes it possible, in particular, to calibrate non-rotationally symmetrical errors of the measuring system in the case of a wavefront measurement.
- the invention makes it possible to measure additional direction-dependent, non-rotationally symmetric terms or modes in the wavefront with increased accuracy. As a result, calibration methods are made possible which, beyond a shift for the calibration of direction-dependent wavefront errors, involve a rotation of the measuring mask used and / or the sensor arrangement used.
- the rotation according to the invention enables a practical implementation of a calibration method which takes into account a correct and any manufacturing errors of the measuring system, also in a projection exposure apparatus with an anamorphic imaging system.
- a further turntable translatable in the object plane is furthermore provided, over which one at least one
- Measuring mask having measuring structure can be positioned in different rotational positions in the beam path instead of the mask.
- the further turntable is arranged on a mask holding device provided for holding the mask.
- the direct attachment of this further rotary table to the mask holding device has the advantage that a comparatively fast or frequent implementation of the wave front and / or distortion measurement is made possible.
- the further turntable is arranged on a separate, translationally movable holding device provided by a mask holding device provided for holding the mask.
- the measurement mask has at least one line grating for distortion measurement.
- the measurement mask has at least one two-dimensional shear grating for wavefront measurement.
- the measurement mask has at least one aperture for ptychography.
- the projection objective is an anamorphic imaging system. Further embodiments of the invention are described in the description and the dependent claims.
- FIGS. 5-6 are schematic representations for explaining the performance of a calibration method in a device for moire measurement of a test object as an exemplary application of the present invention.
- FIG. 4a shows, in a merely schematic representation, the possible structure of a microlithographic projection exposure apparatus according to the invention.
- the EUV-designed projection exposure apparatus 400 has an illumination device and a projection objective.
- the illumination device has a field facet mirror 402 and a pupil facet mirror 403.
- the light of a light source unit 401 comprising a plasma light source and a collector mirror is steered. in the
- a deflecting mirror 406 is arranged downstream of the light path, which deflects the radiation impinging on it onto an object field in the object plane of a projection objective comprising six mirrors 431-436.
- a reflective structure-carrying mask 409 is arranged on a mask table or a mask holding device 408, wherein the mask 409 is imaged with the aid of the projection lens in an image plane in which a with a photosensitive layer (photoresist) coated substrate 416 is located on a wafer stage or a wafer holding device 415.
- the projection exposure apparatus 400 has a first turntable 410, which is translationally movable in the object plane.
- a measuring mask 41 1 can be positioned in the optical path in different rotational positions.
- the measuring mask 41 1 in the exemplary embodiment has structures which are different from one another and serve different purposes.
- the structures labeled "41 1 a" are used for (field-point resolved) wavefront measurement, and the structures labeled "41 1 b" serve for distortion measurement.
- the invention is not limited thereto.
- the projection exposure apparatus has a turntable 420, which can be moved translationally in the image plane of the projection lens, via which a sensor group can be positioned in different rotational positions in the beam path instead of the wafer.
- this sensor group has both sensors for wavefront measurement (group 421 a) and sensors for distortion measurement (group 421 b).
- the first turntable 410 is disposed on the mask table or a mask holding means 408 provided to hold the mask 409
- the second turntable 420 is disposed on the wafer table or a wafer for holding a wafer 416, respectively - Holding device 415 arranged.
- the first turntable 410 and the second turntable 420 can each also be arranged on a translationally movable holding device separate from the mask holding device 408 or wafer holding device 415.
- FIG. 1 shows in a further schematic representation of an embodiment according to the invention, wherein here on a separate from the mask holding device, translationally (in the direction of arrow) movable holding device 100 turntables 1 10, 120 are provided, of which a turntable 1 10 a Measuring mask 1 1 1 with a line grating for distortion measurement and the other turntable 120 has a measuring mask 121 with a two-dimensional shear grating for wavefront measurement.
- FIGS. 2a-2b show further schematic representations of possible embodiments of a sensor group which can be positioned according to the invention in the image plane instead of the wafer.
- turntables 210, 220, and 230 are disposed on a wafer holder 200 for holding a wafer 205, and each of the turntables 210-230 may be equipped with a suitable sensor array for directory or wavefront measurement.
- FIG. 2b shows a possible embodiment with a translationally movable holding device 240 separate from the wafer holding device, on which turntables 250, 260 and 270 are arranged, wherein on the turntable 250 a two-dimensional
- FIG. 3 shows only schematically a further representation of a according to the double arrows in two mutually perpendicular directions within the image plane translationally movable holding device 300, wherein on this holding device 300, a turntable 310 is arranged, on which a line grating 31 1 is provided for distortion measurement.
- a device for moire measurement of an optical specimen 512 or projection objective has a grating arrangement comprising a first grating 51 1 having test structures that can be positioned and imaged in the optical beam path in front of the specimen 512 and a second optical path for the specimen 512 positionable grid 514, and an at least one detector 515 having evaluation unit for evaluating generated by superimposition of the two gratings in a detection path located in the optical path to the second grating 514 Moire structures.
- the generated image of the test structures contained in the first grid 51 1 is denoted by "513.”
- the levels of the test structure image 513 on the one hand and of the second grid 514 or the Moire mask on the other hand coincide and are only spatially separated for better illustration
- the detector 515 in the optical beam path should follow as closely as possible to the image plane in which the test pattern image 513 is generated.
- the grating arrangement of the first grating 51 1 and the second grating 514 i.e., the moiré mask
- the moiré mask can now be designed such that in each case
- Moire measurement or evaluation of the signals obtained here is possible. This can be achieved in each case in that the first grid 51 1 and the second grid 514 are matched to one another in such a way that in the detection level is an evaluation result in which the light intensity transmitted by the grating arrangement is maximally reduced in the case of an error-free imaging by the specimen 512 and in the case of existing aberrations of the specimen 512, for at least two measurement positions (which can be selected for the purpose of calibration) are different with respect to the relative position of grid array and sample 512 is obtained.
- the respective grating periods of the first grating 51 1 and the second grating 514 may be selected such that the grating period of the second grating 514 is a common multiple or a common divisor of the respective periods of two test pattern images of the test structures generated by the imaging system in two different measurement positions of the first grid 51 1 corresponds.
- different rotational and / or displacement positions can be set between the measuring arrangement comprising the said grid arrangement on the one hand and the test object on the other hand, which can take place in the projection exposure apparatus according to the invention using the described translationally movable turntables.
- the calibration method described above is made possible by carrying out a moire measurement or evaluation of the signals obtained in a plurality of rotation and / or displacement positions between the measuring arrangement comprising the said grating arrangement on the one hand and the test specimen on the other hand becomes.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Epidemiology (AREA)
- Public Health (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020514268A JP7288896B2 (ja) | 2017-09-20 | 2018-09-18 | ウェハ保持デバイス及び投影マイクロリソグラフィシステム(projection microlithography system) |
KR1020207007743A KR20200054207A (ko) | 2017-09-20 | 2018-09-18 | 웨이퍼 홀딩 디바이스 및 투영 마이크로리소그래피 시스템 |
US16/823,790 US10948833B2 (en) | 2017-09-20 | 2020-03-19 | Wafer holding device and projection microlithography system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017216679.7A DE102017216679A1 (de) | 2017-09-20 | 2017-09-20 | Mikrolithographische Projektionsbelichtungsanlage |
DE102017216679.7 | 2017-09-20 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/823,790 Continuation US10948833B2 (en) | 2017-09-20 | 2020-03-19 | Wafer holding device and projection microlithography system |
Publications (1)
Publication Number | Publication Date |
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WO2019057696A1 true WO2019057696A1 (de) | 2019-03-28 |
Family
ID=63720640
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2018/075173 WO2019057696A1 (de) | 2017-09-20 | 2018-09-18 | Wafer-halteeinrichtung sowie mikrolithographische projektionsbelichtungsanlage |
Country Status (5)
Country | Link |
---|---|
US (1) | US10948833B2 (de) |
JP (1) | JP7288896B2 (de) |
KR (1) | KR20200054207A (de) |
DE (1) | DE102017216679A1 (de) |
WO (1) | WO2019057696A1 (de) |
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US5798947A (en) | 1996-09-25 | 1998-08-25 | The Board Of Trustees Of The Leland Stanford, Jr. University | Methods, apparatus and computer program products for self-calibrating two-dimensional metrology stages |
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US6573997B1 (en) * | 2000-07-17 | 2003-06-03 | The Regents Of California | Hybrid shearing and phase-shifting point diffraction interferometer |
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EP1652003B1 (de) | 2003-07-08 | 2015-01-07 | Nikon Corporation | Wafer-tisch für die immersions-lithographie |
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DE102017200428B3 (de) | 2017-01-12 | 2018-06-21 | Carl Zeiss Smt Gmbh | Projektionsbelichtungsanlage sowie Verfahren zum Vermessen eines Abbildungsfehlers |
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-
2017
- 2017-09-20 DE DE102017216679.7A patent/DE102017216679A1/de not_active Ceased
-
2018
- 2018-09-18 KR KR1020207007743A patent/KR20200054207A/ko not_active Application Discontinuation
- 2018-09-18 WO PCT/EP2018/075173 patent/WO2019057696A1/de active Application Filing
- 2018-09-18 JP JP2020514268A patent/JP7288896B2/ja active Active
-
2020
- 2020-03-19 US US16/823,790 patent/US10948833B2/en active Active
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US20200218163A1 (en) | 2020-07-09 |
JP7288896B2 (ja) | 2023-06-08 |
DE102017216679A1 (de) | 2019-03-21 |
JP2020534565A (ja) | 2020-11-26 |
US10948833B2 (en) | 2021-03-16 |
KR20200054207A (ko) | 2020-05-19 |
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