WO2006033336A1 - 照明装置、露光装置及びマイクロデバイスの製造方法 - Google Patents
照明装置、露光装置及びマイクロデバイスの製造方法 Download PDFInfo
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- WO2006033336A1 WO2006033336A1 PCT/JP2005/017346 JP2005017346W WO2006033336A1 WO 2006033336 A1 WO2006033336 A1 WO 2006033336A1 JP 2005017346 W JP2005017346 W JP 2005017346W WO 2006033336 A1 WO2006033336 A1 WO 2006033336A1
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- Prior art keywords
- light
- optical system
- illumination
- reflective
- incident
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- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 70
- 230000004907 flux Effects 0.000 claims abstract description 5
- 238000005286 illumination Methods 0.000 claims description 93
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- 239000004973 liquid crystal related substance Substances 0.000 description 12
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- 239000004065 semiconductor Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 239000011733 molybdenum Substances 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
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- 244000248349 Citrus limon Species 0.000 description 2
- 235000005979 Citrus limon Nutrition 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 238000011144 upstream manufacturing Methods 0.000 description 2
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
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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
- G03F7/70058—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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/143—Beam splitting or combining systems operating by reflection only using macroscopically faceted or segmented reflective surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0019—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors)
- G02B19/0023—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors) at least one surface having optical power
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0095—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
-
- 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
- G03F7/70075—Homogenization of illumination intensity in the mask plane by using an integrator, e.g. fly's eye lens, facet mirror or glass rod, by using a diffusing optical element or by beam deflection
Definitions
- the present invention relates to an illumination apparatus for manufacturing a microdevice such as a semiconductor element, a liquid crystal display element, and a thin film magnetic head in a lithographic process, an exposure apparatus provided with the illumination apparatus, and a microdevice using the exposure apparatus It is related with the manufacturing method.
- EUV extreme ultraviolet
- a reflective optical system is used because a glass material having a high transmittance with respect to light of a short wavelength is limited (for example, see JP-A-11 312638).
- laser light emitted from a non-EUV light laser light source 201 and condensed by a condensing mirror 202 is used.
- the target material supplied by the nozzle 203 at point 204 the target material receives intense energy and turns into plasma, and EUV light is generated.
- the generated EUV light is collected by a condensing mirror 205, reflected by a drawing optical system 206, and incident on an incident-side fly-eye mirror 207 in which many concave mirrors are arranged in parallel.
- the light beam reflected by the incident-side fly-eye mirror 207 is reflected by the exit-side fly-eye mirror 209 in which a large number of concave mirrors are arranged in parallel through the aperture stop 208, and again through the aperture stop 208, by the optical system 210. Is incident on.
- the light beam reflected by the optical system 210 is collected by the optical system 211 and irradiates the mask 212.
- the pattern image of the irradiated mask 212 is projected and exposed to a wafer (photosensitive substrate) 214 via a projection optical system 213.
- the illumination light incident on the incident-side fly-eye mirror 207 is wave-divided and superimposed on the mask to illuminate the illumination light.
- High illuminance uniformity it is necessary that the illuminance distribution of the illumination light incident on the incident-side fly-eye mirror 207 includes as little as possible the illuminance distribution change due to the high frequency. That is, the light beam having the light intensity distribution not including the change in the illuminance distribution due to the high frequency shown in FIG. 3B is incident on the incident-side fly-eye mirror 207 from the light beam having the light intensity distribution including the many changes in the illuminance distribution due to the high frequency shown in FIG. I hope that.
- the light flux incident on the incident side fly-eye mirror 207 is suppressed while suppressing the loss of the amount of illumination light.
- Light intensity distribution force It is necessary to remove the light intensity distribution due to high frequency components.
- An object of the present invention is to provide an illumination device capable of improving the illuminance uniformity of illumination light while suppressing loss of the amount of illumination light, an exposure device provided with the illumination device, and a microdevice using the exposure device It is to provide a manufacturing method.
- An illuminating device of the present invention is an illuminating device that illuminates a surface to be irradiated with illumination light emitted from a light source, and is disposed between the light source and the surface to be irradiated, and a light beam from the light source is separated into a wavefront
- a reflective fly-eye optical system composed of a plurality of reflective partial optical systems for splitting and overlapping on the irradiated surface, and disposed between the light source and the reflective fly-eye optical system
- a reflective optical system that guides illumination light to the reflective fly's eye optical system, and the reflective optical system is characterized in that at least a part of the reflective surface of the optical system is constituted by a diffusing surface.
- the reflection type fly's eye optical since at least a part of the reflection surface of the reflection type optical system disposed upstream of the reflection type fly's eye optical system is configured by the diffusion surface, the reflection type fly's eye optical The light intensity distribution due to the high frequency component can be removed from the light intensity distribution of the illumination light incident on the system, and the uniformity of the illuminance distribution of the illumination light can be improved. Therefore, when this illumination device is used in an exposure device, the mask surface (and thus the photosensitive substrate surface) can be uniformly illuminated by illumination light, so that the resolution, contrast, etc. on the photosensitive substrate are reduced. The fine pattern formed on the mask can be satisfactorily exposed on the photosensitive substrate.
- the reflective optical system disposed upstream of the reflective fly's eye optical system may be a single mirror or may be composed of a plurality of mirrors. Also, when using multiple mirrors, the diffusing surface may be formed on only one mirror. Alternatively, it may be formed on a plurality of mirrors.
- the diffusion angle of the diffusing surface is half of the range in which the light beam diffused by the diffusing surface from one point of the diffusing surface reaches the incident surface of the reflective fly's eye optical system.
- the value width is an angle of DZ2 to DZ100 with respect to the incident diameter D of the fly-eye optical system.
- the angle of the light beam diffused by the diffusing surface is preferably set so that the spread of the light beam on the fly's eye surface falls within the range of D / 2 to D / 100.
- the illumination device of the present invention is characterized in that the RMS value representing the surface roughness of the diffusion surface corresponding to the high-frequency region of the PSD (Power Spectral Density) value of the shape of the diffusion surface is smaller than lZl 4 of the wavelength of the illumination light.
- the deviation of the ideal surface shape force is large in the region where the PSD value of the diffusing surface corresponds to the high frequency region, there is a possibility that light quantity loss will occur and this will be a problem.
- the RMS value representing the surface roughness of the diffusion surface corresponding to the high frequency region is smaller than 1Z14 of the wavelength of the illumination light, it is possible to reduce problems such as light loss.
- the illumination device of the present invention has a difference between the PSD (Power Spectral Density) value of the diffused surface shape and the PSD value of the flatter curve and is smaller than other frequency regions lower than that in the high frequency region. Characterized by
- the present invention proposes to roughen the diffusion surface in the lower frequency region than in the high frequency region.
- the force is close to the PSD of the ideally polished surface even in the low-frequency region.
- the average difference in the high frequency region may be compared with the average difference between other frequencies, or the RMS value may be compared with the maximum value.
- the diameter of the incident surface of the reflective fly's eye optical system is D
- the distance from the reflective optical system to the incident surface of the reflective fly's eye optical system is L
- the wavelength of the illumination light is selected, the boundary value between the high frequency region and another frequency region lower than the high frequency region is lower than DZ2L.
- the diffusion angle of light increases as the frequency of the surface roughness pitch of the diffusion surface increases. Therefore, when the pitch of the surface roughness of the diffusion surface is small, the diffusion angle of the illumination light becomes very large. Therefore, the illumination light diffuses in a direction in which it cannot enter the reflective fly-eye optical system, and the illumination light The amount of light decreases.
- the diffusion angle becomes too large, resulting in a loss of light amount.
- the surface shape corresponding to the high frequency region where the diffusion angle becomes too large and the light amount loss may occur is close to the ideal surface shape, the high frequency component of the illumination intensity can be removed while reducing the light amount loss.
- the illumination device of the present invention is configured such that the diameter of the incident surface of the reflective fly-eye optical system is D, the distance from the reflective optical system to the incident surface of the reflective fly-eye optical system is L, and the wavelength of the illumination light
- the boundary value between the high frequency region and another frequency region lower than the high frequency region is higher than D / 10CU L.
- DZlOO (m) is a value that diffuses out of the range that can enter the reflective fly's eye optical system
- P 100 ⁇ LZD and the corresponding frequency is DZ100 ⁇ L in the same manner as described above.
- the boundary value is set so as to have a function of removing a high frequency component of the illumination intensity distribution.
- the PSD Power Spectral Density
- the PSD Power Spectral Density
- the luminous flux can be diffused within the range where it is possible. Therefore, the light intensity distribution due to the high frequency component can be removed from the light intensity distribution of the illumination light incident on the reflective fly-eye optical system while suppressing the loss of the amount of illumination light incident on the reflective fly-eye optical system.
- the uniformity of the illuminance distribution of the illumination light can be improved.
- the illumination device of the present invention is characterized in that the surface roughness of the diffusion surface is finer than the lmm pitch, and the pitch roughness is 0.5 to 3 nm RMS.
- the fineness and the roughness of the pitch are 0.5 to 3 nm RMS rather than the lmm pitch of the diffusion surface, it is possible to maintain a high reflectance of the illumination light with respect to the diffusion surface. And loss of the amount of illumination light can be prevented. Therefore, it is possible to remove the light intensity distribution due to the high-frequency component of the light intensity distribution of the illumination light incident on the reflective fly-eye optical system while suppressing the loss of the light quantity of the illumination light, improving the uniformity of the illumination light illumination distribution It can be made.
- the surface in order for light to diffuse, the surface must undulate at least several times within the diameter of the light beam. In a normal exposure apparatus, the light beam diameter of the thinnest light is about 20 to 30 mm. Therefore, when the pitch is 1 mm or less, surface waviness can be formed a sufficient number of times within the light beam diameter. .
- the illumination device of the present invention is characterized in that the light beam illuminated on the irradiated surface is EUV light having a wavelength of 5 to 40 nm. Even when EUV light of 5 to 40 nm is used as illumination light, illumination uniformity can be improved satisfactorily.
- the exposure apparatus of the present invention is characterized in that the exposure apparatus for transferring a mask pattern onto a photosensitive substrate comprises the illumination apparatus of the present invention for illuminating the mask.
- the exposure apparatus of the present invention since the illumination apparatus that can improve the uniformity of the illuminance of the illumination light while suppressing the loss of the amount of illumination light, the resolving power and the contrast on the photosensitive substrate are provided.
- the fine pattern formed on the mask can be exposed on the photosensitive substrate with high throughput.
- the microdevice manufacturing method of the present invention includes an exposure process of exposing a mask pattern onto a photosensitive substrate using the exposure apparatus of the present invention, and the photosensitive material exposed by the exposure process. And a developing step for developing the substrate.
- the exposure is performed using the exposure apparatus capable of improving the uniformity of the illuminance of the illumination light while suppressing the loss of the amount of illumination light. It is possible to prevent a decrease in the resolution and contrast, and to manufacture a microdevice having a fine circuit pattern with a high throughput.
- the illumination device of the present invention since at least a part of the reflection surface of the reflective optical system is configured by the diffusing surface, it is incident on the reflective fly-eye optical system while suppressing the loss of the amount of illumination light. Light intensity distribution force of illumination light can be removed, and the intensity distribution of illumination light can be more uniform. Therefore, when this illumination device is used for an exposure device, the mask surface (and thus the photosensitive substrate surface) can be uniformly illuminated by the illumination light, thereby preventing a decrease in resolving power or contrast on the photosensitive substrate. The fine pattern formed on the mask can be exposed on the photosensitive substrate with high V and throughput.
- the illumination apparatus that can improve the uniformity of the illumination light intensity while suppressing the loss of the light quantity of the illumination light, is provided on the photosensitive substrate. It is possible to prevent degradation of resolution and contrast, and the fineness formed on the mask. Pattern can be exposed on a photosensitive substrate with high throughput.
- microdevice manufacturing method of the present invention exposure is performed using the exposure apparatus that can improve the uniformity of the illuminance of the illumination light while suppressing the loss of the amount of illumination light. Degradation of the resolving power and contrast on the conductive substrate can be prevented, and microdevices having fine circuit patterns can be manufactured with high throughput.
- FIG. 1 is a diagram showing a schematic configuration of a projection exposure apparatus that works on this embodiment.
- FIG. 2 is a graph showing the surface roughness of a surface where the reflecting surface is ideally polished and the surface roughness of the diffuser surface of the collector mirror that is used in this embodiment.
- FIG. 3A is a light intensity distribution of illumination light before being incident on a collector mirror that works according to this embodiment.
- FIG. 3B is a graph showing the light intensity distribution of the illumination light after being reflected by the collector mirror according to this embodiment.
- FIG. 4 is a flowchart showing a method for manufacturing a semiconductor device as a micro device according to an embodiment of the present invention.
- FIG. 5 is a flowchart showing a method of manufacturing a liquid crystal display element as a micro device that is relevant to an embodiment of the present invention.
- FIG. 6 is a diagram showing a schematic configuration of a conventional projection exposure apparatus.
- FIG. 1 is a diagram showing a schematic configuration of a projection exposure apparatus that works on this embodiment.
- This projection exposure apparatus includes a high-power laser light source 2, a condensing lens 4, a plasma light source 5, a nozzle 6, a condensing mirror 8, a collector mirror 10, a reflective fly-eye optical system 12, 14, and a condenser mirror. , 20 etc.
- Exposure light (illumination light) emitted by an illuminating device, that is, EUV (extreme ultra violet) light having a wavelength of about 5 to 40 nm is used for the projection optical system PL.
- EUV extreme ultra violet
- this projection exposure apparatus since this projection exposure apparatus has low transmittance of EUV light, which is exposure light, to the atmosphere, the optical path through which the EUV light passes is covered by a vacuum chamber (not shown). .
- Laser light emitted from a high-power laser light source 2 such as a YAG laser light source or an excimer laser light source that is excited by a semiconductor laser is condensed by a condensing lens 4 to a point (condensing point) that becomes a plasma light source 5.
- Xenon gas (Xe), krypton gas (Kr), etc. as a plasma light source target are ejected from the nozzle 6 at the condensing point.
- the target is excited to the plasma state by the energy of the laser light emitted from the high-power laser light source 2, and when this transitions to the low potential state, EUV light, ultraviolet light with a wavelength of lOOnm or more, visible light, and light of other wavelengths Release.
- EUV light or the like emitted from the plasma light source 5 enters the condensing mirror 8.
- the condensing mirror 8 is arranged so that the first focal position of the condensing mirror 8 or its vicinity coincides with the condensing point that is the plasma light source 5.
- an EUV light reflecting film for example, a multilayer film in which molybdenum (Mo) and silicon (Si) are alternately formed is formed. Accordingly, only EUV light having a wavelength of about 13 nm out of EUV light and the like incident on the condensing mirror 8 is reflected by the condensing mirror 8 and condensed on the second focal position of the condensing mirror 8.
- an EUV light reflecting film that reflects only EUV light having a wavelength of about 1 lnm, such as a multilayer film that also has molybdenum (Mo) and beryllium (Be) power, is used. Good.
- EUV light reflected by the collector mirror 8 is condensed as exposure light (illumination light) at or near the second focal position of the collector mirror 8, and is then collected on the collector mirror (reflecting collector optical system) 10. More reflected.
- the collector mirror 10 is a multi-layer film that has a strong substrate such as glass, ceramic, or metal, and also has a molybdenum (Mo) and silicon (Si) force formed on the substrate. It is comprised by.
- the reflecting surface of the collector mirror 10 is constituted by a diffusing surface such as a lemon skin, in which scattering of the rough surface is reduced by chemical corrosion.
- the reflecting surface of the substrate of the collector mirror 10 can be etched, imprinted or embossed to form a reflecting surface having lemon skin-like irregularities. That is, a collection of convex mirrors with regular small focal lengths. It has a random reflecting surface without the periodicity of convex mirrors and concave mirrors with different focal lengths.
- the diffusion surface of the collector mirror 10 is configured such that the diffusion surface-open PSD (Power Spectral Density) is smaller in the high frequency region than the PSD of the fractal curve.
- PSD Power Spectral Density
- the boundary value between the high frequency region and other lower frequency regions is the diameter of the entrance surface of the incident side fly-eye mirror (arranged optically nearly conjugate with the surface to be irradiated), which will be described later.
- D the distance from the collector mirror 10 to the incident surface of the incident side fly-eye mirror 12 is L
- the wavelength of the EUV light is preferably lower than DZ2 L as described above, and more than DZlOCU L Higher is preferred.
- Fig. 2 is a graph showing the surface roughness (broken line) of the surface whose reflection surface is ideally polished (hereinafter referred to as the ideal surface) and the surface roughness (solid line) of the diffusion surface of the collector mirror 10. It is.
- the surface shape of the ideal surface indicated by the broken line is a fractal state, that is, a state in which a macroscopic structural similarity is observed even when the reflection surface is magnified.
- the PSD (power spectral density) in this fractal state can be expressed in KZf. Where f is the frequency and ⁇ , n is a constant.
- the PSD in the fractal state is shown in a logarithmic notation graph, it becomes a broken line in the graph of FIG.
- the curve shown by the broken line in the graph of Fig. 2 shows the surface roughness of the ideal surface.
- the surface roughness of the diffusing surface of the collector mirror 10 indicated by a solid line is configured to diffuse the illumination light (exposure light) within a range in which it can be incident on the incident-side fly-eye mirror 12. That is, in a predetermined frequency region A (hereinafter referred to as an intermediate frequency region) shown in FIG. 2, the diffused illumination light is diffused within a range where it can enter the incident-side fly-eye mirror 12. That is, the surface roughness of the diffusion surface of the collector mirror 10 is so rough that the illumination light is diffused within a range where the illumination light can enter the incident-side fly-eye mirror 12.
- the diffusion angle of the illumination light (exposure light) with respect to the diffusion surface is inversely proportional to the pitch of the surface roughness of the diffusion surface, resulting in an increase and diffusion. Since the illumination light diffuses out of the range where it can enter the incident-side fly-eye mirror 12, the difference is reduced with respect to the shape represented by the curve shown by the broken line. The difference is that the surface roughness (RMS value) of the diffusing surface corresponding to this high-frequency region is the illumination light. If the wavelength is smaller than 1Z14, the effect of diffusion in the high-frequency region can be reduced, so that the loss of the amount of light incident on the incident-side fly-eye mirror 12 can be kept low.
- the half-value width of the range where the light beam diffused by the diffusion surface spreads and reaches the incident surface of the fly-eye mirror 12 on the incident side is preferably DZ2 to DZ100.
- the light intensity distribution of EUV light before entering the collector mirror 10 is the light intensity distribution shown in FIG. 3A
- the light intensity distribution is the light intensity distribution shown in Fig. 3B. That is, by diffusing the EUV light incident on the collector mirror 10, the light intensity distribution force of the EUV light can be removed, and the illuminance of the EUV light can be maintained while maintaining the amount of EUV light. The uniformity of distribution can be improved.
- the surface roughness of the diffusion surface of the collector mirror 10 is 0.5 to 3 nm RMS (Root Mean Square) with a pitch finer than a 1 mm pitch.
- RMS is the root mean square, and is the standard deviation representing the variation in the surface roughness of the collector mirror 10. Accordingly, it is possible to prevent a decrease in the reflectance of the EUV light with respect to the diffusion surface of the collector mirror 10, and it is possible to prevent a decrease in the amount of EUV light.
- the light beam diameter of the thinnest EUV light is about Since the pitch is 20 to 30 mm and the pitch is 1 mm or less, surface undulation can be formed a sufficient number of times within the beam diameter of EUV light.
- EUV light having high illuminance uniformity by being reflected by the collector mirror 10 is guided to the reflective fly-eye optical system 12, 14 as an optical integrator, and the reflective fly-eye optical system 12, 14 Is incident on one of the incident side fly-eye mirrors 12.
- the entrance-side fly-eye mirror 12 is composed of element mirrors (reflection partial optical systems), which are a plurality of concave mirrors arranged in parallel, and a position optically conjugate with or near the mask M-plane or wafer W-plane. Is arranged.
- the reflection surface of each element mirror that composes the incident side fly-eye mirror 12 is made of glass, ceramics, metal, etc. to improve the EUV light reflectivity. And a multilayer film made of molybdenum (Mo) and silicon (Si) formed on the substrate.
- EUV light that has been wavefront-divided by being incident on the incident-side fly-eye mirror 12 is reflected by the incident-side fly-eye mirror 12 and constitutes a reflective fly-eye optical system 12 and 14 via an aperture stop 16 Is incident on the other exit-side fly-eye mirror 14.
- the exit side fly eye mirror 14 is composed of element mirrors (reflection partial optical systems) which are a plurality of concave mirrors arranged in parallel corresponding to each of the plurality of element mirrors constituting the entrance side fly eye mirror 12. It is arranged at a position optically conjugate with the pupil plane of the projection optical system PL described later.
- each element mirror constituting the exit side fly-eye mirror 14 is formed on a substrate that has power such as glass, ceramics, metal, and the like in order to improve the reflectance of EUV light, It consists of a multilayer film that also has molybdenum (Mo) and silicon (Si) forces.
- Each of a number of EUV lights reflected by the wavefront division by the incident-side fly-eye mirror 12 is incident on each of the element mirrors constituting the emission-side fly-eye mirror 14, and the emission-side fly-eye mirror 14
- a secondary light source composed of a large number of light source images is formed on or near the exit surface.
- EUV light from the secondary light source reflected by the exit-side fly-eye mirror 14 enters the condenser mirror 18 through the aperture stop 16.
- the aperture stop 16 determines the numerical aperture of the illumination light.
- the reflecting surface of the condenser mirror 18 is made of glass, ceramics, metal, or other powerful substrate, and molybdenum (Mo) and silicon (Si) formed on the substrate in order to improve the EUV light reflectivity. It is composed of a multilayer film that also has power.
- the EUV light incident on the condenser mirror 18 is reflected by the condenser mirror 18, is incident on the condenser mirror 20, is reflected by the condenser mirror 20, and is condensed on the mask M.
- the EUV light reflected by the condenser mirror 18 uniformly and uniformly illuminates the reflective mask M on which a predetermined circuit pattern is formed.
- the EUV light reflected by the reflective mask M forms a secondary light source image at the pupil of the reflective projection optical system PL, and is formed on the mask M on the wafer W as a photosensitive substrate coated with a resist. Project a pattern image.
- the reflecting surface of the collector mirror is constituted by a diffusing surface
- the light intensity distribution force of EUV light incident on the incident type fly-eye mirror depends on the high-frequency component.
- the light intensity distribution can be removed.
- the difference between the PSD of the diffusing surface and the shape expressed by the fractal curve in the high frequency region is small, so that EUV light diffused by the collector mirror can be incident on the incident side fly-eye mirror. Can be diffused.
- EUV light diffused by the collector mirror does not diffuse outside the range that can be incident on the incident-side fly-eye mirror, the incident fly-eye is suppressed while suppressing the loss of the amount of EUV light incident on the incident-side fly-eye mirror.
- Light intensity distribution of EUV light incident on the mirror Light intensity distribution due to high frequency components can be removed, and the illuminance distribution uniformity of EUV light can be improved. Therefore, since the mask surface (and thus the wafer surface) can be uniformly illuminated by EUV light, it is possible to prevent a decrease in resolution and contrast on the wafer surface, and the fine pattern formed on the mask. The pattern can be exposed on the wafer surface with high throughput.
- EUV light is used as exposure light.
- KrF excimer laser light, ArF excimer laser light, or F laser light is used.
- the entire reflecting surface of the collector mirror is constituted by a diffusing surface, but a part of the reflecting surface of the collector mirror is constituted by a diffusing surface. You may be made to do.
- the number of mirrors is not limited to one, and a plurality of mirrors may be used.
- the frequency band for roughening the above-described surface shape can be determined for each mirror.
- the reticle (mask) is illuminated by the illumination device, and the transfer pattern formed on the mask is exposed to the photosensitive substrate (wafer) using the projection optical system.
- a micro device semiconductor element, imaging element, liquid crystal display element, thin film magnetic head, etc.
- FIG. 4 shows an example of a technique for obtaining a semiconductor device as a micro device by forming a predetermined circuit pattern on a wafer or the like as a photosensitive substrate using the exposure apparatus according to the above-described embodiment. This will be described with reference to the flowchart of FIG. [0043] First, in step S301 of FIG.
- a metal film is deposited on one lot of wafers.
- a photoresist is applied onto the metal film on the one lot of wafers.
- the pattern image on the mask is sequentially exposed and transferred to each shot area on the wafer of one lot via the projection optical system. .
- the photoresist on the one lot of wafers is developed, and in step S305, etching is performed on the one lot of wafers using the resist pattern as a mask. Circuit pattern force corresponding to the pattern is formed in each shot area on each wafer.
- a device such as a semiconductor element is manufactured by forming a circuit pattern of an upper layer.
- the exposure apparatus that is effective in the above-described embodiment, it is possible to prevent a decrease in resolving power or contrast on the photosensitive substrate, and a fine circuit pattern. Can be obtained with high throughput.
- Steps S301 to S305 the power for depositing metal on the wafer, applying a resist on the metal film, and performing the exposure, development, and etching processes. Prior to these processes, After forming a silicon oxide film, a resist may be applied on the silicon oxide film, and each process such as exposure, development, and etching may be performed.
- a liquid crystal display element as a micro device is obtained by forming a predetermined pattern (circuit pattern, electrode pattern, etc.) on a plate (glass substrate). You can also.
- a mask pattern is transferred and exposed to a photosensitive substrate (such as a glass substrate coated with a resist) using an exposure apparatus that is powerful in the embodiment described above.
- the process is executed.
- a predetermined pattern including a large number of electrodes and the like is formed on the photosensitive substrate.
- the exposed substrate is subjected to various processes such as a developing process, an etching process, and a resist peeling process, whereby a predetermined pattern is formed on the substrate, and the process proceeds to the next color filter forming process S402.
- a color filter is formed in which a large number of sets of three dots are arranged in a matrix, or a set of filters of three stripes of R, G, and B are arranged in a plurality of horizontal scanning line directions.
- a cell assembly step S403 is performed after the color filter formation step S402, a cell assembly step S403 is performed.
- a liquid crystal panel liquid crystal cell
- liquid crystal is assembled using the substrate having the predetermined pattern obtained in the pattern formation step S401 and the color filter obtained in the color filter formation step S402.
- liquid crystal is injected between the substrate having the predetermined pattern obtained in the pattern forming step S401 and the color filter obtained in the color filter forming step S402. ).
- components such as an electric circuit and a backlight for performing display operation of the assembled liquid crystal panel (liquid crystal cell) are attached to complete the liquid crystal display element.
- the above-described method for manufacturing a liquid crystal display element since exposure is performed using the exposure apparatus that is suitable for the above-described embodiment, it is possible to prevent a reduction in resolution, contrast, and the like on the photosensitive substrate. A semiconductor device having a fine circuit pattern can be obtained with high throughput.
- the illumination apparatus, exposure apparatus, and microdevice manufacturing method of the present invention are suitable for use in manufacturing microdevices such as high-performance semiconductor elements, liquid crystal display elements, and thin film magnetic heads. Yes.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Optical Elements Other Than Lenses (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/660,927 US7800734B2 (en) | 2004-09-22 | 2005-09-21 | Lighting apparatus, exposure apparatus and microdevice manufacturing method |
JP2006536382A JP4518078B2 (ja) | 2004-09-22 | 2005-09-21 | 照明装置、露光装置及びマイクロデバイスの製造方法 |
EP05785921A EP1796147A4 (en) | 2004-09-22 | 2005-09-21 | LIGHTING DEVICE, EXPOSURE DEVICE AND MICROPOWER ELEMENT MANUFACTURING METHOD |
KR1020077006443A KR101273740B1 (ko) | 2004-09-22 | 2005-09-21 | 조명 장치, 노광 장치 및 마이크로 디바이스의 제조 방법 |
IL181506A IL181506A0 (en) | 2004-09-22 | 2007-02-22 | Lighting apparatus, exposure apparatus and microdevice manufacturing method |
Applications Claiming Priority (2)
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JP2004-275048 | 2004-09-22 | ||
JP2004275048 | 2004-09-22 |
Publications (1)
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WO2006033336A1 true WO2006033336A1 (ja) | 2006-03-30 |
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PCT/JP2005/017346 WO2006033336A1 (ja) | 2004-09-22 | 2005-09-21 | 照明装置、露光装置及びマイクロデバイスの製造方法 |
Country Status (7)
Country | Link |
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US (1) | US7800734B2 (ja) |
EP (1) | EP1796147A4 (ja) |
JP (1) | JP4518078B2 (ja) |
KR (1) | KR101273740B1 (ja) |
CN (1) | CN100452295C (ja) |
IL (1) | IL181506A0 (ja) |
WO (1) | WO2006033336A1 (ja) |
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Also Published As
Publication number | Publication date |
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JP4518078B2 (ja) | 2010-08-04 |
CN100452295C (zh) | 2009-01-14 |
KR101273740B1 (ko) | 2013-06-12 |
EP1796147A1 (en) | 2007-06-13 |
CN1985356A (zh) | 2007-06-20 |
US7800734B2 (en) | 2010-09-21 |
IL181506A0 (en) | 2007-07-04 |
US20090002662A1 (en) | 2009-01-01 |
JPWO2006033336A1 (ja) | 2008-05-15 |
KR20070054666A (ko) | 2007-05-29 |
EP1796147A4 (en) | 2008-12-17 |
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