WO2005086209A1 - 光学素子、投影光学系及び露光装置 - Google Patents
光学素子、投影光学系及び露光装置 Download PDFInfo
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- WO2005086209A1 WO2005086209A1 PCT/JP2005/003970 JP2005003970W WO2005086209A1 WO 2005086209 A1 WO2005086209 A1 WO 2005086209A1 JP 2005003970 W JP2005003970 W JP 2005003970W WO 2005086209 A1 WO2005086209 A1 WO 2005086209A1
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- optical element
- reflecting mirror
- optical system
- thin film
- projection optical
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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
- G02B5/10—Mirrors with curved faces
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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
- G03F7/20—Exposure; Apparatus therefor
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/06—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction or reflection, e.g. monochromators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
Definitions
- the present invention relates to an optical element, a projection optical system, and an exposure apparatus, and more particularly, to an optical element, a projection optical system, and an exposure apparatus used for EUV lithography using EUV light as illumination light.
- a circuit pattern formed on a mask is projected and transferred onto a photosensitive substrate such as a wafer via a projection optical system.
- a resist is applied on the photosensitive substrate, and the resist is exposed by projection exposure through a projection optical system to obtain a resist pattern corresponding to the mask pattern.
- the resolving power W of the exposure apparatus depends on the wavelength of the exposure light (illumination light) and the numerical aperture NA of the projection optical system, and is expressed by the following equation.
- Patent Document 1 Japanese Patent Application Laid-Open No. 10-90602
- the RMS value of the wavefront aberration of the projection optical system in order to favorably transfer a circuit pattern onto a photosensitive substrate, even if the RMS value of the wavefront aberration of the projection optical system is large, it is not more than 1/14 of the wavelength of the exposure light. It is believed that it needs to be below (more realistically, less than 1/30). Therefore, in an exposure apparatus that performs EUV lithography, since the wavelength of the exposure light is 13 nm, the RMS value of the wavefront aberration of the projection optical system needs to be about 1 nm or less.
- the wavefront aberration per optical element is 0.4 nm (lnm ⁇ 6), and the reflection
- the shape error of the reflection surface of the optical element of the mold is required to be 0.2 nm or less.
- the projection light may be changed due to the temporal change of the holding force of the optical element. It is not possible to cope with the deterioration of the academic wavefront.
- the reflection type optical element has a configuration in which a multilayer film as a reflection film is formed on a surface of a substrate.
- the EUV light reflectance of this multilayer film is currently about 70%, and the remaining 30% is absorbed by the multilayer film and converted into heat. For this reason, a problem arises in that the multilayer film is thermally deformed during exposure, and the wavefront of the projection optical system is deteriorated.
- a method has been proposed in which a piezoelectric element (piezo element) or the like is arranged on the back surface of the substrate and the substrate itself is deformed so as to suppress deterioration of the wavefront.
- this method it is not only possible to suppress the deterioration of the wavefront when the multilayer film is thermally deformed, but also when the wavefront of the projection optical system is deteriorated due to the temporal change of the holding force of the optical element as described above. It is possible to cope even if it is.
- the back surface of the substrate of the optical element is an effective heat dissipation surface of the optical element.
- the heat dissipation of the optical element becomes insufficient.
- the thermal deformation of the optical element becomes large and the wavefront is deteriorated.
- the present invention has been made in view of the above-described problems, and has an object to achieve both reduction of wavefront aberration caused by a shape error of an optical element and suppression of deterioration of the wavefront caused by aging.
- an optical element (1, 7) is an optical element including a reflecting mirror (2) for reflecting illumination light on a predetermined surface (21).
- a reflecting mirror deforming means (3-5) for deforming the reflecting mirror (2) by applying a force to the non-reflecting surface (22) of the reflecting mirror (2) by using a magnetic force;
- Deformation means (3-5) includes a magnetic thin film (3) formed on the non-reflective surface (22) of the reflecting mirror (2), and a plurality of electromagnets arranged to face the magnetic thin film (3).
- driving means (5) for driving the electromagnet (4).
- a force is applied to the non-reflective surface (22) of the reflecting mirror (2) by magnetic force by the reflecting mirror deforming means (3-5).
- the reflecting mirror (2) can be deformed. Therefore, after polishing of the reflector (2) is completed, the shape of the reflector (2) is temporarily determined. Even if the shape error is 0.2 nm or more and an unacceptable wavefront aberration occurs, the generated wavefront aberration can be reduced by deforming the reflector (2) by the reflector deforming means (3-5). It can be reduced.
- the reflecting mirror (2) is similarly deformed by the reflecting mirror deforming means (3-5). It is possible to improve the wavefront.
- the optical element (1, 7) since the reflecting mirror (2) is deformed by the magnetic force, for example, the reflecting mirror (2) is provided on the back surface (22) of the reflecting mirror (2). There is no need to directly install means (piezoelectric element, etc.) for directly applying a force to the optical element (1, 7), and the heat radiation area of the optical element (1, 7) can be sufficiently secured. For this reason, the time-dependent change of the reflector (2) due to the heat generated by itself can be suppressed.
- the optical element (1, 7) of the present invention both reduction of the wavefront aberration caused by the shape error of the optical element (1, 7) and suppression of the deterioration of the wavefront caused by aging can be achieved. Becomes possible.
- the reflecting mirror (2) can be formed of a magnetic material, it is not necessary to form the magnetic thin film (3) on the non-reflective surface (22) of the reflecting mirror (2)! /.
- the magnetic thin film (3) is formed on the entire back surface (22) of the reflecting mirror (2). ⁇ A configuration can be adopted.
- a magnetic force can be applied to the entire back surface (22) of the reflecting mirror (2), so that the entire reflecting surface (predetermined surface) of the reflecting mirror (2) is It can be deformed vertically to 22).
- a magnetic thin film (3) may be formed on the side surface (non-reflective surface) of the reflecting mirror (2), and the reflecting mirror may be deformed in the plane direction of the back surface (22).
- the magnetic thin film (3) can be formed on the back surface (22) of the reflecting mirror (2) corresponding to the effective area (A) to which the illumination light is directly irradiated.
- the optical element (1, 7) according to the present invention be provided with cooling means (81, 82) for cooling the reflecting mirror (2).
- the optical element (1, 7) according to the present invention can sufficiently secure a heat radiation area.
- the provision of the cooling means (81, 82) makes it possible to promote the heat radiation of the optical element. For this reason, the temporal change of the reflector (2) due to the heat generated by itself is further suppressed.
- the optical element (1, 7) is an optical element including a reflecting mirror (2) that reflects illumination light on a predetermined surface (21).
- Reflecting mirror deforming means (3-5) for deforming the reflecting mirror (2) by applying a force to the non-reflecting surface (22) using magnetic force, and cooling means for cooling the reflecting mirror (2) ( 81, 82), wherein the reflecting mirror deforming means (3-5) is a magnetic thin film (3) formed on a non-reflective surface (22) of the reflecting mirror (2);
- the cooling plate (81) is cooled by the cooling element (82), and the reflection mirror is cooled by the radiation of the cooling plate (81). Further, the deformation of the reflecting mirror (2) caused by the heat generated by the electromagnet (4) can be suppressed (the electromagnet can be cooled).
- a flow path for flowing a cooling medium between the electromagnet and the magnetic thin film may be provided as a cooling means.
- the projection optical system (114) forms an image of the first surface (11 la) on the second surface (112a) via a plurality of optical elements (CM1-CM6).
- the optical element (1, 7) according to the present invention is used as at least one of the plurality of optical elements (CM1 to CM6).
- the reduction of the wavefront aberration resulting from the shape error of the optical element (1, 7) and the suppression of the deterioration of the wavefront resulting from a temporal change can be compatible.
- the projection optical system (114) of the present invention the projection optical system on the second surface (112a) The distortion of the image on one surface (11 la) can be reduced.
- the optical element (1, 7) according to the present invention should be used as at least one optical element in the projection optical system according to the present invention.
- the projection optical system (114) according to the present invention includes the optical element (1, 7) according to the present invention as the last optical element (CM6) of the plurality of optical elements (CM1 to CM6). If you use!, You can adopt a configuration.
- the effective area of the last optical element (CM6) is wider than the other optical elements (CM1 to CM5) in order to secure a large numerical aperture NA of the projection optical system (114). . Therefore, by using the optical element (1, 7) according to the present invention as the last-stage optical element (CM6), it is possible to more easily control the wavefront.
- the projection optical system (114) according to the present invention In the case where the optical element having the widest effective area among the plurality of optical elements (CM1 to CM6) is not the last optical element (CM6), the projection optical system (114) according to the present invention.
- the area (effective area) irradiated with the illumination light is the widest!
- the optical element according to the present invention is used as the optical element! Can be adopted.
- the exposure apparatus (100) converts the pattern image of the mask (111) positioned on the first surface (11 la) through the projection optical system (114) to the second surface (11 la).
- the distortion of the image of the first surface (111a) on the second surface (112a) can be reduced. Therefore, according to the exposure apparatus (100) of the present invention, it is possible to transfer the pattern image of the mask (111) to the photosensitive substrate (112) in a state where the distortion of the pattern image is reduced.
- an exposure apparatus (100) according to the present invention includes the optical element (1, 7) according to the present invention.
- the invention's effect In the present invention, it is possible to simultaneously reduce the wavefront aberration caused by the shape error of the optical element and to suppress the deterioration of the wavefront caused by the aging, so that a stable and good pattern image can be formed on the photosensitive substrate. It becomes possible to transfer.
- FIG. 1A is a schematic plan view of an optical element according to an embodiment of the present invention.
- FIG. 1B is a schematic sectional view of an optical element according to one embodiment of the present invention.
- FIG. 2 is a view showing a modification of the optical element shown in FIG. 1B.
- FIG. 3 is a view schematically showing an exposure apparatus according to one embodiment of the present invention.
- FIG. 4 is a diagram schematically showing a projection optical system according to an embodiment of the present invention.
- FIG. 5 is a flowchart showing an example of a semiconductor device manufacturing process.
- FIGS. 1A and 1B are diagrams showing a schematic configuration of an optical element 1 according to the present embodiment.
- FIG. 1A is a plan view
- FIG. 1B is a cross-sectional view.
- the optical element 1 according to the present embodiment includes a reflecting mirror 2 that reflects exposure light (illumination light) on a surface 21 (predetermined surface), and a back surface 22 (non- (Reflection surface), a magnetic thin film 3 formed over the entirety, a plurality of electromagnets 4 arranged opposite to the magnetic thin film 3, and a drive control device 5 (drive means) for driving the electromagnet 4. Te ru.
- the reflecting mirror 2 is formed of a low thermal expansion glass having a polished surface 21, and a multilayer film 23 (see FIG. 1B, not shown in FIG. 1A) is formed on the surface 21.
- This multilayer The film 23 obtains a high reflectance as a whole by adjusting the phase of the weak reflected light at the interface and superimposing the reflected light many times, for example, a molybdenum (Mo) film and a silicon (Si) film. It is a MoZSi multilayer film in which a plurality of films are laminated.
- It may be a combined multilayer film.
- the plurality of electromagnets 4 are arranged at a predetermined distance D with respect to the magnetic thin film 3 by being arranged in a reflecting mirror holder 6 that holds the reflecting mirror 2 by supporting it at three places. As shown, they are arranged in parallel with the back surface 22 of the reflecting mirror 2.
- the electromagnets 4 are arranged in a lattice by arranging the electromagnets 4, and are arranged in a region having substantially the same size as the rear surface 22 of the reflecting mirror 2.
- Each of these electromagnets 4 is connected to a drive control device 5, and each of the electromagnets 4 is independently driven by the drive control device 5.
- the reflector deforming means according to the present invention includes a magnetic thin film 3, an electromagnet 4, and a drive control means 5 according to the present embodiment.
- the optical element 1 for example, when the surface 21 of the reflecting mirror 2 in the area B shown in FIGS. 1A and 1B is convex compared to other parts, Then, the electromagnet 4 corresponding to the region B is driven by the drive control device 5, or the electromagnet 4 corresponding to the region B is driven to generate a strong magnetic force as compared with the other electromagnets 4. Thereby, the area B is pulled, and the surface 21 of the reflecting mirror 2 is returned to the surface shape of the design value.
- one or more electromagnets 4 corresponding to region B are driven or driven to generate a stronger magnetic force than the other electromagnets 4, so that the rear surface 22 In the magnetic thin film 3 formed in the above, the portion corresponding to the region B is strongly pulled as compared with the other portions, whereby the magnetic thin film 3 is deformed. Then, with the deformation of the magnetic thin film 3, the surface 21 of the reflecting mirror 2 corresponding to the region B is pulled, and the protrusion is eliminated.
- one or a plurality of electromagnets 4 corresponding to regions other than the region B are driven or driven to generate a stronger magnetic force than the other electromagnets 4, so that the back of the reflecting mirror 2 is In the magnetic thin film 3 formed on the surface 22, a portion corresponding to a region other than the region B is strongly pulled as compared with the other portions, whereby the magnetic thin film 3 is deformed. Then, along with the deformation of the magnetic thin film 3, the surface 21 of the reflecting mirror 2 corresponding to a region other than the region B is pulled and the dent is eliminated.
- the optical element 1 by driving the electromagnet 4 according to the shape of the region B, the reflecting mirror 2 is deformed, and the surface 21 of the reflecting mirror 2 is set to the design value. The surface shape can be restored. Therefore, wavefront aberration caused by the shape error of the reflecting mirror 2 can be reduced.
- the electromagnet 4 is disposed at a predetermined distance D from the back surface 22 of the reflecting mirror 2, and the back surface 22 of the reflecting mirror 2 has a magnetic thin film. Since only 3 is formed, the entire back surface 22 of the reflector 2 can be secured as a heat dissipation area.
- the entire surface 21 of the reflector 2 is perpendicular to the back surface 22. Can be deformed.
- the size of the electromagnet 4 is not particularly limited, but the smaller the size, the more finely the magnetic thin film 3 can be controlled.
- the size of the electromagnet 4 may be different for each electromagnet 4.
- the electromagnet 4 corresponding to the effective area A (the area to which the exposure light is directly irradiated) is set to a relatively small electromagnet
- the electromagnet 4 corresponding to outside A may be a relatively large electromagnet.
- the shape and arrangement pattern of the electromagnet 4 can be arbitrarily set.
- the magnetic thin film 3 is formed on the entire back surface 22 of the reflecting mirror 2, and the electromagnet 4 is provided so as to face the magnetic thin film 3.
- a configuration can be adopted in which a magnetic thin film is further formed on the side surface (non-reflective surface) of the reflecting mirror 2 and an electromagnet is provided to face the magnetic thin film.
- the reflecting mirror 2 can be deformed in the surface direction of the back surface 22, and the reflecting mirror 2 can be deformed more precisely.
- the magnetic thin film 3 may be patterned in a predetermined shape (for example, so as to correspond to the effective area A), which need not necessarily be formed on the entire installation surface.
- a cooling means for cooling the electromagnet 4 may be provided.
- the electromagnet 4 When the electromagnet 4 is driven, it generates heat. By removing this heat by the cooling means, it is possible to further suppress the aging of the reflecting mirror 2.
- optical element 7 which is a modification of the optical element 1 shown in FIGS. 1A and 1B will be described with reference to FIG.
- the description of the same parts as those of the optical element 1 shown in FIGS. 1A and 1B is omitted or simplified.
- FIG. 2 is a sectional view of the optical element 7 according to the present embodiment.
- the optical element 7 is configured by adding a cooling plate 81 for cooling the reflecting mirror 2 and a Bertier element 82 (cooling element) to the configuration of the optical element 1.
- the cooling means according to the present invention includes a cooling plate 81 and a Peltier element 82 in the present embodiment.
- the cooling plate 81 is a plate member made of, for example, copper (Cu) or aluminum (A1), which is a non-magnetic material and has high thermal conductivity.
- the cooling plate 81 is arranged between the magnetic thin film 3 and the electromagnet 4 in parallel with the back surface 22 of the reflecting mirror 2 by being inserted into a through portion 61 formed in the reflecting mirror holder 6. Further, a plurality of Peltier elements 82 are provided on the cooling plate 81 outside the reflector holder 6. The Peltier element 82 is cooled by applying a drive current (not shown), and the cooling plate 81 is cooled by cooling the Peltier element 82.
- the radiation of the cooling plate 81 cools the reflecting mirror 2.
- the cooling plate 81 is formed of a non-magnetic material, it is possible to apply a magnetic force to the magnetic thin film 3 by the electromagnet 4 via the cooling plate 81. It becomes possible.
- the same effect as that of the optical element 1 shown in FIGS. 1A and 1B can be obtained, and the reflecting mirror 2 can be more uniformly cooled from the back surface 22.
- the heat radiation of the optical element 7 is promoted, and it is possible to further suppress the temporal change of the reflecting mirror 2 due to the heat generated by the reflecting mirror 2 itself.
- a flow path through which a cooling medium flows is arranged between the electromagnet 4 and the magnetic thin film 3. It is also possible to adopt a configuration in which the reflecting mirror 2 is cooled by radiation of a cooling medium flowing through the flow path.
- FIG. 3 is a diagram schematically showing an exposure apparatus according to one embodiment of the present invention.
- An EUV exposure apparatus (exposure apparatus) 100 shown in this figure includes an EUV light generation apparatus (laser plasma light source) 101.
- the EUV light generator 101 includes a spherical vacuum vessel 102, and the inside of the vacuum vessel 102 is evacuated (vacuum suction) by a vacuum pump (not shown).
- a multilayer parabolic mirror 104 is installed with the reflecting surface 104a facing downward (+ Z direction) in the drawing.
- a lens 106 is arranged on the right side (+ Y direction) of the vacuum vessel 102 in the figure, and a laser light source (not shown) is arranged on the right side of the lens.
- This laser light source emits pulsed laser light 105 in the Y direction.
- This pulsed laser beam 105 is focused on the focal point of the multilayer parabolic mirror 104 by the lens 106.
- Xenon (Xe) gas ejected from the nozzle tip is supplied to this focal position, and when the focused pulsed laser beam 105 is applied to the ejected xenon gas (target material 103), plasma 107 is emitted. Generated.
- This plasma 107 emits EUV light 108 (exposure light) in a wavelength band around 13 nm.
- An EUV light filter 109 that cuts (blocks) visible light is provided below the vacuum vessel 102. Have been killed.
- the EUV light 108 is reflected in the + Z direction by the multilayer parabolic mirror 104, passes through the EUV light filter 109, and is guided to the exposure chamber 110. At this time, the spectrum of the visible light band of the EUV light 108 is cut.
- xenon gas is used as the target material, but a substance such as tin (Sn), which may be a xenon cluster or a droplet, may be used.
- a laser plasma light source is used as the EUV light generator 101, a discharge plasma light source can be employed. The discharge plasma light source converts the target material into plasma by pulsed high-voltage discharge and emits EUV light from the plasma.
- An exposure chamber 110 is provided below the EUV light generator 101 in the figure.
- An illumination optical system 113 is arranged inside the exposure chamber 110.
- the illumination optical system 113 is composed of a condenser mirror, a fly-eye optical mirror, and the like (simplified in the figure), and converts the EUV light 108 incident from the EUV light generator 101 into a circle. It is formed in an arc shape and irradiated toward the left (-Y direction) in the figure.
- a reflection mirror 115 is disposed on the left side of the illumination optical system 113.
- the reflecting mirror 115 is a circular concave mirror, and is held vertically (parallel to the Z-axis) by a holding member (not shown) so that the reflecting surface 115a faces rightward (+ Y direction) in the drawing.
- An optical path bending reflecting mirror 116 is disposed on the right side of the reflecting mirror 115 in the drawing.
- a reflective mask 111 is disposed horizontally (parallel to the XY plane) such that the reflective surface 11 la faces downward (+ Z direction).
- the EUV light emitted from the illumination optical system 113 is reflected and condensed by the reflecting mirror 115, and reaches the reflecting surface 11 la of the reflecting mask 111 via the optical path bending reflecting mirror 116.
- a reflective film made of a multilayer film is also formed on the reflective surface 11 la of the reflective mask 111.
- a mask pattern corresponding to the pattern to be transferred to the wafer (photosensitive substrate) 112 is formed on the reflective film of the reflective mask 111.
- the reflection type mask 111 is attached to a mask stage 117 illustrated in the upper part of the figure.
- the mask stage 117 is movable at least in the Y direction, and the EUV light reflected by the optical path bending reflecting mirror 116 is sequentially scanned on the reflective mask 111.
- the projection optical system 114 and the wafer (photosensitive (Substrate coated with grease) 112 are disposed at the bottom of the reflection type mask 111 in the figure.
- the wafer 112 is fixed on a wafer stage 118 that can move in the XYZ directions so that the exposure surface 112a faces upward (in the Z direction) in the figure.
- the EUV light reflected by the reflective mask 111 is reduced to a predetermined reduction magnification (for example, 1Z4) by the projection optical system 114 to form an image on the wafer 112, and the pattern on the mask 111 is transferred onto the wafer 112.
- a predetermined reduction magnification for example, 1Z4
- FIG. 4 is a diagram showing a projection optical system 114 composed of six reflecting mirrors.
- the projection optical system 114 shown in this figure includes six reflecting mirrors (optical elements) CM1 to CM6, and projects the EUV light reflected by the reflective mask 111 onto the wafer 112.
- the four reflectors CM 1—CM4 on the upstream side form the first reflective image forming an intermediate image of the mask pattern (image) on the mask 111 (on the first surface).
- the EUV light reflected by the mask 111 is reflected by the reflecting surface R1 of the first concave reflecting mirror CM1, and is reflected by the reflecting surface R2 of the second convex reflecting mirror CM2.
- the EUV light reflected by the reflecting surface R2 passes through the aperture stop AS, and is sequentially reflected by the reflecting surface R3 of the third convex reflecting mirror CM3 and the reflecting surface R4 of the fourth concave reflecting mirror CM4.
- An intermediate image is formed.
- EUV light from the intermediate image of the mask pattern formed via the first reflective imaging optical system G1 is reflected by the reflecting surface R5 of the fifth convex reflecting mirror CM5 and the reflecting surface of the sixth concave reflecting mirror CM6. After being sequentially reflected by R6, a reduced image of the mask pattern is formed on the wafer 112.
- EUV light is projected onto the wafer 112 via the multilayer parabolic mirror 104, the EUV light filter 109, the reflecting mirror of the illumination optical system 113, the reflecting mirrors 115 and 116, CM1 to CM6, and the like. Form a pattern image.
- the optical element of the present invention is used as the reflecting mirror CM6.
- the reflecting mirror CM6 is disposed at the last stage of the reflecting mirrors CM1 to CM6 constituting the projection optical system 114.
- NA the numerical aperture
- the effective area is different from that of the other.
- Reflector CM 1 Larger than CM5.
- the optical element of the present invention is used as the reflecting mirror CM6.
- the reflection surface R6 of the mirror CM6 is deformed so as to cancel the wavefront aberration, so that the change over time can occur.
- the resulting deterioration of the wavefront can be suppressed. Therefore, according to the projection optical system 114 of the present embodiment, the distortion of the mask pattern image on the wafer 112 can be reduced. Further, according to the exposure apparatus 100 of the present embodiment, it is possible to transfer the mask pattern image to the wafer 112 while reducing the distortion of the mask pattern image, and it is possible to transfer a stable and good pattern image to the wafer 112. Become.
- the multilayer film is heated and deformed by the irradiation of the EUV light 108 during the exposure.
- the amount of thermal deformation of the multilayer film during the exposure changes according to the exposure time. For this reason, in the exposure apparatus 100 according to the present embodiment, by simulation or measurement in advance, how the multilayer film is deformed during exposure is determined, and control data is created based on the determined result. By storing the control data in the drive control device 5 and controlling the magnetic force balance, it is possible to always reduce the wavefront aberration during the exposure.
- the projection optical system 114 according to the present embodiment is mounted on the exposure apparatus 100 after a predetermined performance test after being assembled once. For this reason, during the performance test, the magnetic force balance (current value applied to the electromagnet) for reducing the wavefront aberration is recorded, and after the projection optical system 114 is mounted on the exposure apparatus 100, the recorded magnetic force balance is reproduced. As a result, the projection optical system of the present invention can be mounted on the exposure apparatus 100.
- the optical element of the present invention is the optical element having the widest effective area.
- the photosensitive substrate of the above embodiment is used not only for a semiconductor wafer for manufacturing a semiconductor device, but also for a glass substrate for a display device, a ceramic wafer for a thin film magnetic head, or an exposure apparatus.
- the original mask or reticle used synthetic quartz, silicon wafer or the like is applied.
- the exposure apparatus 100 includes a step-and-scan type scanning exposure apparatus (scanning stepper) for scanning and exposing a pattern of the mask 111 by synchronously moving the mask 111 and the wafer 112, and a mask.
- the present invention can also be applied to a step-and-repeat type projection exposure apparatus (stepper) in which the pattern of the mask 111 is exposed collectively while the wafer 111 and the wafer 112 are stationary, and the wafer 112 is sequentially moved in steps.
- the present invention is also applicable to a step-and-stitch type exposure apparatus for transferring at least two patterns on the wafer 112 while partially overlapping each other.
- the present invention is also applicable to a twin-stage type exposure apparatus disclosed in JP-A-10-163099, JP-A-10-214783, JP-T-2000-505958, and the like.
- the type of the exposure apparatus 100 is not limited to an exposure apparatus for manufacturing a semiconductor element for exposing a semiconductor element pattern onto a substrate, but may be an exposure apparatus for manufacturing a liquid crystal display element or a display, a thin-film magnetic head, an imaging apparatus, or the like. It can be widely applied to an exposure apparatus for manufacturing a device (CCD) or a reticle or a mask.
- CCD device
- reticle a mask
- a linear motor (USP5, 623,853 or
- each of the stages 117 and 118 may be of a type that moves along a guide or a guideless type that does not have a guide.
- each stage 117 and 118 As a driving mechanism of each of the stages 117 and 118, a magnet unit having a two-dimensionally arranged magnet and an armature unit having a two-dimensionally arranged coil are opposed to each other, and each stage 117 and 118 is driven by an electromagnetic force.
- a flat motor may be used.
- one of the magnet unit and the armature unit should be connected to the stages 117 and 118, and the other of the magnet unit and the armature unit should be provided on the moving surface side of the stages 117 and 118.
- JP-A-8-166475 US Pat. No. 5,528,118
- a reaction force generated by the movement of the substrate stage 118 is not transmitted to the projection optical system 114 by using a frame member. You may mechanically escape to the floor (ground).
- reaction force generated by the movement of the mask stage 117 is not transmitted to the projection optical system 114. Therefore, as described in JP-A-8-330224 (US Pat. No. 5,874,820), the reaction force is mechanically increased by using a frame member. You may escape to the floor (earth). Further, the reaction force may be processed using the law of conservation of momentum as described in Japanese Patent Application Laid-Open No. 8-63231 (US Pat. No. 6,255,796).
- the exposure apparatus 100 of the present embodiment assembles various subsystems including the constituent elements recited in the claims of the present application so as to maintain predetermined mechanical accuracy, electrical accuracy, and optical accuracy. It is manufactured by. Before and after this assembly, adjustments to achieve optical accuracy for various optical systems, adjustments to achieve mechanical accuracy for various mechanical systems, and For electrical systems, adjustments are made to achieve electrical accuracy.
- Various subsystems The process of assembling into an exposure system includes mechanical connections, wiring connections of electric circuits, and piping connections of pneumatic circuits among the various subsystems. It goes without saying that there is an individual assembly process for each subsystem before the assembly process for the exposure system. When the process of assembling the various subsystems into the exposure apparatus is completed, comprehensive adjustment is performed, and various precisions of the entire exposure apparatus are ensured. It is desirable that the exposure apparatus be manufactured in a clean room where the temperature, cleanliness, etc. are controlled.
- a micro device such as a semiconductor device includes a step 201 for designing the function and performance of the micro device, a step 202 for manufacturing a mask (reticle) based on the design step, Step 203 of manufacturing a wafer as a base material, wafer processing step 204 of exposing a mask pattern to a substrate by the exposure apparatus 100 of the above-described embodiment, and device assembly step (including a dicing step, a bonding step, and a packaging step) 205, inspection step 206, etc.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Optics & Photonics (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
Abstract
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JP2006510780A JP4577307B2 (ja) | 2004-03-09 | 2005-03-08 | 光学素子、投影光学系及び露光装置 |
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JP2004065846 | 2004-03-09 | ||
JP2004-065846 | 2004-03-09 |
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WO2005086209A1 true WO2005086209A1 (ja) | 2005-09-15 |
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PCT/JP2005/003970 WO2005086209A1 (ja) | 2004-03-09 | 2005-03-08 | 光学素子、投影光学系及び露光装置 |
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JP (1) | JP4577307B2 (ja) |
WO (1) | WO2005086209A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011103411A (ja) * | 2009-11-11 | 2011-05-26 | Nikon Corp | 光学素子の保持装置、光学系、及び露光装置 |
JP2011119551A (ja) * | 2009-12-04 | 2011-06-16 | Nikon Corp | 光学部材変形装置、光学系、露光装置、デバイスの製造方法 |
JP2015519736A (ja) * | 2012-04-27 | 2015-07-09 | カール・ツァイス・エスエムティー・ゲーエムベーハー | 磁歪材料を含む光学素子 |
JP2016121905A (ja) * | 2014-12-24 | 2016-07-07 | 大陽日酸株式会社 | 多重反射容器 |
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JP2002011573A (ja) * | 2000-06-28 | 2002-01-15 | Kobe Steel Ltd | 溶接構造およびそれを備えた熱交換器 |
JP2003203860A (ja) * | 2001-12-21 | 2003-07-18 | Asml Netherlands Bv | リソグラフィ装置およびデバイス製造方法 |
JP2004247947A (ja) * | 2003-02-13 | 2004-09-02 | Olympus Corp | 光学装置 |
JP2004309684A (ja) * | 2003-04-04 | 2004-11-04 | Olympus Corp | 結像光学系及びそれを用いた撮像装置 |
JP2004319682A (ja) * | 2003-04-15 | 2004-11-11 | Canon Inc | 露光装置及びデバイスの製造方法 |
JP2005019628A (ja) * | 2003-06-25 | 2005-01-20 | Nikon Corp | 光学装置、露光装置、並びにデバイス製造方法 |
JP2005039862A (ja) * | 2004-10-25 | 2005-02-10 | Casio Comput Co Ltd | カメラ装置、データ供給装置及びカメラ・システム、並びに方法及び記録媒体 |
JP2005092175A (ja) * | 2003-08-08 | 2005-04-07 | Olympus Corp | 光学特性可変光学素子 |
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TW575771B (en) * | 2000-07-13 | 2004-02-11 | Asml Netherlands Bv | Lithographic apparatus, device manufacturing method, and device manufactured thereby |
-
2005
- 2005-03-08 JP JP2006510780A patent/JP4577307B2/ja not_active Expired - Fee Related
- 2005-03-08 WO PCT/JP2005/003970 patent/WO2005086209A1/ja active Application Filing
Patent Citations (8)
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JP2002011573A (ja) * | 2000-06-28 | 2002-01-15 | Kobe Steel Ltd | 溶接構造およびそれを備えた熱交換器 |
JP2003203860A (ja) * | 2001-12-21 | 2003-07-18 | Asml Netherlands Bv | リソグラフィ装置およびデバイス製造方法 |
JP2004247947A (ja) * | 2003-02-13 | 2004-09-02 | Olympus Corp | 光学装置 |
JP2004309684A (ja) * | 2003-04-04 | 2004-11-04 | Olympus Corp | 結像光学系及びそれを用いた撮像装置 |
JP2004319682A (ja) * | 2003-04-15 | 2004-11-11 | Canon Inc | 露光装置及びデバイスの製造方法 |
JP2005019628A (ja) * | 2003-06-25 | 2005-01-20 | Nikon Corp | 光学装置、露光装置、並びにデバイス製造方法 |
JP2005092175A (ja) * | 2003-08-08 | 2005-04-07 | Olympus Corp | 光学特性可変光学素子 |
JP2005039862A (ja) * | 2004-10-25 | 2005-02-10 | Casio Comput Co Ltd | カメラ装置、データ供給装置及びカメラ・システム、並びに方法及び記録媒体 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011103411A (ja) * | 2009-11-11 | 2011-05-26 | Nikon Corp | 光学素子の保持装置、光学系、及び露光装置 |
JP2011119551A (ja) * | 2009-12-04 | 2011-06-16 | Nikon Corp | 光学部材変形装置、光学系、露光装置、デバイスの製造方法 |
JP2015519736A (ja) * | 2012-04-27 | 2015-07-09 | カール・ツァイス・エスエムティー・ゲーエムベーハー | 磁歪材料を含む光学素子 |
JP2016121905A (ja) * | 2014-12-24 | 2016-07-07 | 大陽日酸株式会社 | 多重反射容器 |
Also Published As
Publication number | Publication date |
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JPWO2005086209A1 (ja) | 2008-01-24 |
JP4577307B2 (ja) | 2010-11-10 |
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