WO2016043292A1 - ペリクル、その製造方法及び露光方法 - Google Patents
ペリクル、その製造方法及び露光方法 Download PDFInfo
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- WO2016043292A1 WO2016043292A1 PCT/JP2015/076568 JP2015076568W WO2016043292A1 WO 2016043292 A1 WO2016043292 A1 WO 2016043292A1 JP 2015076568 W JP2015076568 W JP 2015076568W WO 2016043292 A1 WO2016043292 A1 WO 2016043292A1
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- frame
- pellicle
- frame body
- disposed
- film
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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
- 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
- G03F1/62—Pellicles, e.g. pellicle assemblies, e.g. having membrane on support frame; Preparation thereof
- G03F1/64—Pellicles, e.g. pellicle assemblies, e.g. having membrane on support frame; Preparation thereof characterised by the frames, e.g. structure or material, including bonding means therefor
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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
- 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
- G03F1/62—Pellicles, e.g. pellicle assemblies, e.g. having membrane on support frame; Preparation thereof
-
- 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
- G03F1/66—Containers specially adapted for masks, mask blanks or pellicles; Preparation thereof
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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
- 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
- G03F1/68—Preparation processes not covered by groups G03F1/20 - G03F1/50
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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
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2008—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the reflectors, diffusers, light or heat filtering means or anti-reflective means used
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/7095—Materials, e.g. materials for housing, stage or other support having particular properties, e.g. weight, strength, conductivity, thermal expansion coefficient
- G03F7/70958—Optical materials or coatings, e.g. with particular transmittance, reflectance or anti-reflection properties
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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
- EUV lithography differs from conventional lithography in that exposure is performed under vacuum, and therefore, it has been considered that mounting of a pellicle on a photomask is not essential.
- the pellicle must be attached to the photomask.
- EUV light is easily absorbed by all substances, the pellicle film disposed on the pellicle needs to be a nanometer-order film that has not been conventionally used.
- the currently developed EUV exposure apparatus has a space for mounting the pellicle on the photomask as high as 2.5 mm. Does not exist. However, in order to secure a space for mounting a conventional pellicle having a height of 5 mm or more in the exposure apparatus, it is necessary to change the design of the optical system, which delays the development of EUV lithography.
- the pellicle film sags or swells because it is exposed under vacuum, but it is greatly limited by the installation space of the pellicle, so to prevent damage to the nanometer-order pellicle film Therefore, it is necessary to ensure sufficient ventilation through the ventilation holes arranged in the frame of the pellicle. Although it is necessary to place a filter in the ventilation hole, since the space allowed for the pellicle is greatly limited, the height allowed for the frame is also greatly limited. No design is required.
- the present invention solves the above-described problems, and an object thereof is to provide a pellicle for extreme ultraviolet light lithography, a manufacturing method thereof, and an exposure method.
- the pellicle for extreme ultraviolet light lithography since the pellicle for extreme ultraviolet light lithography has a very thin pellicle film attached to the frame, it is applied by applying force from the top of the frame as in the past when attaching to a photomask. There is a risk of damage to the pellicle membrane. For this reason, a pellicle for extreme ultraviolet lithography needs to be attached to a photomask in a non-contact manner using a dedicated attaching device.
- the non-contact here means that a strong force is not applied from the top of the frame, and the standard of the strong force is about 1 kgf or more which is applied when a conventional photomask is applied.
- the present invention also provides a pellicle for extreme ultraviolet light lithography that can be attached to a photomask in a non-contact manner and a method for manufacturing the pellicle.
- a first frame body on which a pellicle film is disposed, and a first surface that receives a surface of the first frame body opposite to the surface on which the pellicle film is disposed are included.
- a pellicle including a filter disposed on a side surface and covering the through hole.
- the second surface of the second frame engaged with the first frame is perpendicular to the surface of the first frame on which the pellicle film is disposed. Also good.
- the second surface of the second frame engaged with the first frame is inclined inward with respect to the surface of the first frame on which the pellicle film is disposed. May be.
- the second frame body further includes a third surface connected to the first surface and facing the second surface, and the third surface of the second frame body is The first frame may be disposed to face the inner side surface.
- the third surface of the second frame that engages with the first frame is perpendicular to the surface of the first frame on which the pellicle film is disposed. Also good.
- the third surface of the second frame that engages with the first frame is from the first surface to the surface of the first frame on which the pellicle film is disposed. Inclination may be performed so that the distance from the second surface increases.
- the thick portion of the first frame and the second frame may be bonded via an adhesive layer.
- the pellicle film may have a transmittance of 90.0% or more for light having a wavelength of 5 nm or more and 30 nm or less, and a film thickness of 20 nm or more and 50 nm or less.
- the sum of the height of the second frame and the height of the adhesive layer disposed on the lower surface of the second frame may be 2 mm or less.
- the first frame may be made of a material selected from the group consisting of silicon, sapphire, and silicon carbide.
- the ratio of the total area of the vent portion of the filter for the internal volume of the pellicle may be 0.007 mm -1 or 0.026 mm -1 or less.
- a pellicle film is formed on a substrate, and the first frame body is formed by exposing the pellicle film so that the substrate has a frame shape.
- a thick portion including a first surface that receives a surface opposite to the surface on which the pellicle film of the frame is disposed, and a second portion that is connected to the first surface and receives a side surface of the first frame.
- a second frame having a surface of the second frame, forming a through hole in the thick portion of the second frame, and being parallel to a height direction of the second frame.
- a filter that covers the through-hole is bonded to an outer surface of the body, and the first frame is fixed to the second frame via an adhesive layer so as to surround the first frame.
- the second frame in which the pellicle film is exposed by dry etching and the second surface is perpendicular to the surface of the first frame body on which the pellicle film is formed.
- a body may be prepared, and the first frame may be fixed to the second frame via the adhesive layer.
- the second pellicle film is exposed by wet etching, and the second surface is inclined inward with respect to the surface of the first frame body on which the pellicle film is formed.
- a frame body may be prepared, and the first frame body may be fixed to the second frame body via the adhesive layer.
- the pellicle film is exposed by dry etching, the second surface, and the third surface connected to the first surface and facing the second surface are the pellicle film And preparing the second frame that is perpendicular to the surface of the first frame on which is formed, and fixing the first frame to the second frame via the adhesive layer. May be.
- the pellicle film having a thickness of 20 nm to 50 nm is formed on the substrate, and the pellicle film has a transmittance of 90.0% or more for light having a wavelength of 5 nm to 30 nm. May be.
- the total of the height of the second frame body and the height of the adhesive layer disposed on the lower surface of the second frame body may be 2 mm or less.
- the substrate may be a substrate selected from the group consisting of a silicon substrate, a sapphire substrate, and a silicon carbide substrate.
- the ratio may be used as 0.007 mm -1 or 0.026 mm -1 or less of the total area of the vent portion of the filter for the internal volume of said pellicle.
- any of the pellicles is disposed on a reticle surface of a photomask, the photomask is disposed at a predetermined position of an exposure apparatus, and the pellicle is accommodated in a gap having a distance of 3 mm or less from the reticle surface. Then, the photomask having the pellicle disposed thereon is irradiated with light having a wavelength of 5 nm or more and 30 nm or less, and the light emitted from the reticle surface of the photomask having the pellicle disposed thereon is irradiated onto the substrate on which the resist layer is formed. An exposure method is provided.
- a pellicle for extreme ultraviolet light lithography a method for manufacturing the pellicle, and an exposure method are provided.
- a pellicle for extreme ultraviolet light lithography that can be attached to a photomask in a non-contact manner and a method for manufacturing the pellicle can be provided.
- FIG. 1A is a cross-sectional view of a pellicle 800, and FIG.
- the density ⁇ in the formula (2) is a density specific to the substance constituting the pellicle film. Further, the mass absorption coefficient ⁇ in the above formula (2) is obtained as follows. When the photon energy is greater than about 30 eV and the photon energy is sufficiently away from the absorption edge of the atoms, the mass absorption coefficient ⁇ does not depend on the bonding state of the atoms. The photon energy at a wavelength of 13.5 nm is around 92.5 eV, and is sufficiently away from the absorption edge of atoms. Therefore, the mass absorption coefficient ⁇ does not depend on the bonding state between the atoms of the compound constituting the pellicle film.
- the mass absorption coefficient ⁇ of the pellicle film is calculated from the mass absorption coefficient ⁇ 1 of each element (1, 2,..., I) constituting the pellicle film and the mass fraction W i of each element as follows: It is calculated
- a i is the atomic weight of each element i, and n i is the number of each element i.
- the light transmittance of the wavelength of 13.5 nm of the pellicle film is calculated based on the expressions (1) and (2). It can.
- the transmittance can also be calculated from the optical constant website of the X-ray Optical Center at Lawrence Berkeley National Laboratory.
- the substrate for example, a silicon substrate, a sapphire substrate, a silicon carbide substrate, or the like can be used.
- the substrate is preferably a silicon substrate, a sapphire substrate, or a silicon carbide substrate, and more preferably a silicon substrate.
- the height of the pellicle is preferably 2 mm or less in order to prevent the pellicle film from being damaged.
- a very thin pellicle film is formed by the method described above, it is difficult to form a through hole as a vent on the side surface of the frame.
- a method is conceivable in which a first frame having a pellicle film and a second frame having through holes formed on the side surfaces are separately formed and bonded via an adhesive layer.
- the thickness of the first frame is preferably 1 mm or less from the viewpoint of formation and handling of the pellicle film, but it is difficult to reduce the thickness to 100 ⁇ m or less.
- the pellicle 800 includes a first frame body 811 on which a pellicle film 801 is disposed, and a second frame body 813 that is fixed to the first frame body 811 via an adhesive layer 841.
- the second frame body 813 is formed with a through hole 821 penetrating the outer side surface and the inner side surface.
- a filter 831 covering the through-hole 821 is bonded to the side surfaces of the first frame body 811 and the second frame body 813 bonded through the bonding layer 841 through the bonding layer (not shown).
- an adhesive layer 943 for fixing the pellicle 900 to the photomask is formed on the bottom surface of the second frame body 913, and the adhesive layer 943 is protected by the liner 951 until the pellicle 900 is fixed to the photomask.
- the first frame body 911 is formed by wet etching, the side surface of the first frame body 911 is inclined as shown in FIG. become. At this time, a gap 990 is generated between the first frame body 911 and the adhesive layer 941, and sufficient adhesion of the filter 931 cannot be obtained.
- FIG. 1 is a schematic view (perspective view) of a pellicle 100 according to an embodiment of the present invention.
- 2 is a cross-sectional view of the pellicle 100 taken along line AA ′ in FIG.
- the pellicle 100 includes a first frame body 111 on which the pellicle film 101 is disposed, and a second frame body 113 on which the first frame body 111 is fixed.
- the second frame 113 is connected to the first surface 113A and the thick portion 115 including the first surface 113A that receives the surface opposite to the surface on which the pellicle film 101 of the first frame 111 is disposed.
- the pellicle film 101 and the first frame 111 are surrounded by a second surface 113B that receives the side surface of the first frame 111.
- the second frame 113 has an L-shaped cross section orthogonal to the pellicle film 101.
- the pellicle 100 includes a through hole 121 disposed in the second frame 113 and a filter 131 that covers the through hole 121.
- the through hole 121 is disposed in the thick portion 115 of the second frame 113 having a thickness in a direction intersecting the surface of the first frame 111 on which the pellicle film 101 is disposed.
- the filter 131 is disposed on the outer side surface of the second frame 113 that intersects the surface of the first frame 111 on which the pellicle film 101 is disposed via an adhesive layer (not shown).
- the pellicle film and the substrate described above can be used as the pellicle film 101 and the first frame body 111, detailed description is omitted. Silicon, sapphire, and silicon carbide are preferable as the material constituting the first frame 111, and silicon is more preferable.
- the second frame 113 a material having resistance to EUV light, high flatness, and low ion elution is preferable. In order to remove carbon-derived dirt, hydrogen gas is allowed to flow through the exposure apparatus, so that it is preferably made of a material having resistance to hydrogen radicals.
- the material of the 2nd frame 113 (pellicle frame), It can be set as the normal material used for a pellicle frame.
- Specific examples of the material of the second frame 113 include aluminum, aluminum alloys (5000 series, 6000 series, 7000 series, etc.), stainless steel, silicon, silicon alloys, iron, iron alloys, carbon steel, tool steel, Examples thereof include ceramics, metal-ceramic composite materials, and resins. Among these, aluminum and aluminum alloys are more preferable from the viewpoint of light weight and rigidity.
- the second frame 113 may have a protective film on its surface.
- the protective film a protective film having resistance to hydrogen radicals and EUV light present in the exposure atmosphere is preferable.
- An example of the protective film is an oxide film.
- the oxide film can be formed by a known method such as anodic oxidation.
- the first frame body 111 and the second frame body 113 are fixed via an adhesive layer 141.
- the adhesive layer 141 is formed on the first surface 113A of the thick portion 115 of the second frame 113 having a thickness in a direction intersecting the surface of the first frame 111 on which the pellicle film 101 is disposed. Be placed.
- An adhesive layer may be further disposed.
- the thickness of the adhesive layer 141 is preferably as thin as possible within a range in which sufficient adhesion between the first frame body 111 and the second frame body 113 can be secured, and is, for example, 10 ⁇ m or more and 300 ⁇ m or less.
- the adhesive used for the adhesive layer 141 is preferably a material that has resistance to EUV light and generates a small amount of gas. In order to remove carbon-derived dirt, hydrogen gas is allowed to flow through the exposure apparatus, so that it is preferably made of a material having resistance to hydrogen radicals.
- Adhesive refers to an adhesive in a broad sense, and the concept of “adhesive” includes an adhesive.
- Adhesives include acrylic resin adhesives, epoxy resin adhesives, polyimide resin adhesives, silicone resin adhesives, inorganic adhesives, double-sided adhesive tapes, silicone resin adhesives, acrylic adhesives, polyolefin adhesives, etc. Is mentioned.
- Examples of the adhesive used for bonding the first frame 111 and the second frame 113 include an acrylic resin adhesive, an epoxy resin adhesive, a polyimide resin adhesive, a silicone resin adhesive, and an inorganic adhesive. preferable.
- an adhesive used for adhesion to a photomask a double-sided pressure-sensitive adhesive tape, a silicone resin pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, and a polyolefin-based pressure-sensitive adhesive are preferable.
- the through hole 121 is disposed in the thick portion 115 of the second frame 113 having a thickness in a direction intersecting the surface of the first frame 111 on which the pellicle film 101 is disposed. Due to the limitations of the exposure apparatus, the upper limit of the height of the pellicle 100 is 2.5 mm, and the higher the height of the pellicle 100 is better from the prevention of foreign object image formation. However, according to known information, it is said that the height of the pellicle needs to be 2 mm (for example, Non-Patent Document 1).
- the through-hole 121 expands the pellicle film 101 due to the differential pressure inside and outside the pellicle 100.
- the diameter is less than 0.5 mm.
- the diameter of the through hole 121 is set in consideration of the upper limit value of the pressure loss generated in the through hole 121 when the pressure is reduced.
- the pressure loss generated in the through hole 121 when the pressure is reduced is desirably 1 Pa or less, and more desirably 0.5 Pa or less.
- the filter 131 is installed so as to cover the through hole 121, and most of the pressure loss when the pressure is reduced is generated in the filter 131, and almost no pressure loss occurs in the through hole 121.
- the size of the through hole 121 and the number of the through holes 121 are adjusted so that the pressure loss in the through hole 121 is 1 Pa or less, more preferably about 0.1 Pa.
- the diameter of the through-hole 121 when the pressure loss inside and outside the pellicle 100 generated in the through-hole 121 is 1 Pa is 480 ⁇ m and the number is four, or the diameter is 300 ⁇ m and the number Is 40 pieces.
- the shape of the through hole 121 is not particularly limited, and may be a circle, an ellipse, a rectangle, a polygon, a trapezoid, or the like.
- the diameter of the through hole 121 is not particularly limited, but is desirably about 10 to 500 ⁇ m within a range in which the strength of the frame does not decrease.
- the number of the through holes 121 is not particularly limited, and can be selected according to the length of the filter 131 and the width of the filter 131.
- the positions and intervals of the through holes 121 are not particularly limited, but it is preferable to arrange them at equal intervals in the filter 131.
- the filter 131 is formed of a material that can prevent the inflow of dust or the like into the pellicle 100 fixed to the photomask, and has an initial pressure loss of 100 Pa to 550 Pa and a particle size of 0.15 ⁇ m to 0.3 ⁇ m.
- a filter having a particle collection rate of 99.7% or more and 100% or less As the type of filter, for example, an ULPA filter (Ultra Low Penetration Air Filter) can be used.
- the ULPA filter is an air filter having a particle collection rate of 99.9995% or more with respect to particles having a rated air volume of 0.15 ⁇ m and an initial pressure loss of 245 Pa or less.
- a HEPA filter High Efficiency Particulate Air Filter
- the HEPA filter is an air filter having a particle collection rate of 99.97% or more with respect to particles having a rated air volume and a particle size of 0.3 ⁇ m and an initial pressure loss of 245 Pa or less.
- the filter 131 preferably has a width (height) approximately equal to the height of the second frame 113 from the viewpoint of ensuring adhesion to the second frame 113.
- the filter 131 includes a ventilation part 135 and a glue margin part 137 (FIG. 3).
- the margin portion 137 surrounds the periphery of the filter 131 so as to cover the ventilation portion 135.
- the glue margin part 137 plays a role of bonding the second frame body 113 and the ventilation part 135 without any gap. Gas does not pass through the margin portion 137.
- variety of the margin part 137 is 0.2 mm or more and 1.0 mm or less. In order to increase the area of the ventilation part 135, it is desirable that the width of the adhesive margin part 137 is as narrow as possible.
- the total area of the ventilation part 135 of the filter 131 is set in consideration of the upper limit value of the pressure loss generated in the filter when the pressure is reduced. It is desirable that the pressure loss generated in the ventilation part 135 of the filter 131 when the pressure is reduced is 2 Pa or less.
- the length of the ventilation part 135 of the filter 131 can be calculated by dividing the area of the ventilation part 135 of the filter 131 by the width of the ventilation part 135 of the filter 131.
- the range of the length of the ventilation portion 135 per filter is not particularly limited, but is preferably in the range of 1 cm to 15 cm, more preferably 2 cm to 10 cm.
- a pellicle for EUV exposure is assumed to have a long side of 152 mm or less, a short side of 120 mm or less, and a height of 2 mm or less, and decompression and pressurization at 350 Pa / sec are assumed. Difference between inside and outside of the pellicle 100 when the pressure is reduced from normal pressure (0.1 MPa) to the vacuum state (10 ⁇ 4 to 10 ⁇ 6 Pa) during exposure and when the pressure is increased when returning from the vacuum state to the normal pressure.
- An adhesive layer 143 is disposed on the bottom surface of the thick portion 115 of the second frame 113.
- the adhesive layer 143 is a means for fixing the pellicle 100 to the photomask.
- the thickness of the adhesive layer 143 is preferably as thin as possible within a range in which sufficient adhesion between the photomask and the second frame 113 can be ensured, for example, 10 ⁇ m or more and 300 ⁇ m or less.
- the adhesive used for the adhesive layer 143 is preferably a material that has resistance to EUV light and generates a small amount of gas. In order to remove carbon-derived dirt, hydrogen gas is allowed to flow through the exposure apparatus, so that it is preferably made of a material having resistance to hydrogen radicals.
- the pellicle 100 according to the present embodiment can be manufactured as follows with reference to FIGS. 4 and 5, for example. In addition, the following manufacturing processes are an example, Comprising: The order of a manufacturing process can also be changed as needed.
- 4 and 5 are diagrams showing a manufacturing process of the pellicle 100.
- FIG. A substrate 105 is prepared, and a pellicle film 101 is formed on the substrate 105 (FIG. 4A).
- a silicon substrate, a sapphire substrate, a silicon carbide substrate, or the like can be used as the substrate 105, but the substrate 105 is not limited thereto.
- the pellicle film 101 is formed on the substrate 105 so as to have a thickness of 20 nm to 50 nm by vapor deposition. Since EUV light is easily absorbed by any substance, the pellicle film 101 is preferably formed thin so as to have a transmittance of 90.0% or more for light with a wavelength of 5 nm to 30 nm.
- the pellicle film 101 according to the present invention is preferably 90.0% or more for light having a wavelength of about 5 nm to 13.5 nm, more preferably for light having a wavelength of 13.5 ⁇ 0.3 nm. It has transmittance.
- the upper limit of the width of the filter 131 is the same as the width (height) of the second frame 113.
- the width (height) of the filter 131 exceeds the height of the second frame 113, the adhesive margin 137 protrudes from the second frame 113, which is not preferable because the adhesion is reduced.
- An adhesive layer 143 is formed on the bottom surface of the thick portion 115 of the second frame 113. Further, a liner 151 for protecting the adhesive layer 143 is disposed (FIG. 5B).
- the liner 151 in which the adhesive layer 143 is formed may be prepared, and the liner 151 may be attached to the bottom surface of the thick portion 115 of the second frame 113 via the adhesive layer 143.
- the space for mounting the pellicle on the photomask has a height of only 2.5 mm, in this embodiment, the space is arranged on the second frame 113 and on the lower surface of the second frame 113.
- the total height of the adhesive layer 143 is preferably 2 mm or less.
- a member having an L-shaped cross section is used as the second frame 113, and the height of the filter 131 is approximately equal to the height of the second frame 113, so that The filter 131 can be disposed with sufficient adhesion without generating a void other than the through hole 121.
- the side surface of the first frame body 111 is perpendicular to the surface on which the pellicle film 101 is disposed, and the first frame body 111 inside the thin portion 117 of the second frame body 113 that engages with the first frame body 111. Since the second surface 113B is perpendicular to the first surface 113A of the second frame 113, high adhesion between the first frame 111 and the second frame 113 can be obtained.
- the side surface of the first frame 111 is perpendicular to the surface on which the pellicle film 101 is disposed, and the second frame 113 is the pellicle of the first frame 111.
- 113B which surrounds the pellicle film 101 and the first frame 111, and the second surface 113B of the second frame 113 that engages with the first frame 111 is the pellicle film 101. It suffices if it is a right angle with respect to the first surface 113A on which is arranged. Therefore, this embodiment also includes a modified example such as a pellicle 200 shown in FIG.
- the shape of the second frame 213 is different from that of the second frame 113.
- the second frame 213 is connected to the first surface 213A and the thick portion 215 including the first surface 213A that receives the surface opposite to the surface on which the pellicle film 201 of the first frame 211 is disposed. And the second surface 213B that receives the side surface of the first frame 211, and surrounds the pellicle film 201 and the first frame 211.
- the second frame 213 is connected to the first thin portion 217A of the second frame 213 that contacts the side surface of the first frame 211 and the lower surface of the thick portion 215, and the second frame 213 is connected. And a second thin portion 217B including the bottom surface. Accordingly, the second frame body 213 has a shape that is a T-shape. Since the other configuration is the same as that of the pellicle 100, a detailed description thereof is omitted.
- FIG. 7 is a cross-sectional view of the pellicle 300 according to one embodiment of the present invention, taken along line AA ′ in FIG.
- the pellicle 300 includes a first frame 311 in which the pellicle film 301 is disposed, and a second frame 313 in which the first frame 311 is fixed.
- the second frame 313 is connected to the first surface 313A and the thick portion 315 including the first surface 313A that receives the surface opposite to the surface on which the pellicle film 301 of the first frame 311 is disposed.
- the pellicle film 301 and the first frame 311 are surrounded by a second surface 313B that receives the side surface of the first frame 311.
- the second frame 313 has a substantially L-shaped cross section orthogonal to the pellicle film 301.
- the pellicle 300 includes a through hole 321 disposed in the second frame 313 and a filter 331 that covers the through hole 321.
- the through hole 321 is disposed in the thick portion 315 of the second frame 313 having a thickness in a direction intersecting the surface of the first frame 311 on which the pellicle film 301 is disposed.
- the filter 331 is disposed on the outer side surface of the second frame body 313 intersecting the surface of the first frame body 311 on which the pellicle film 301 is disposed via an adhesive layer (not shown).
- the second frame 313 that engages with the first frame 311 has an inner surface of the second frame 313 that intersects the surface of the first frame 311 on which the pellicle film 301 is disposed.
- the pellicle film 301 has a structure inclined inward with respect to the surface of the first frame 311 on which the pellicle film 301 is disposed. That is, the thin portion 317 of the second frame 313 has a substantially L-shaped cross section having an inclination such that the width on the upper surface side is small and the width on the thick portion 315 side is large.
- the pellicle 300 is engaged with the first frame 311, and the inner surface of the second frame 313 intersecting the surface of the first frame 311 on which the pellicle film 301 is disposed is disposed on the pellicle film 301.
- the second frame body 313 can obtain high adhesion with the first frame body 311 formed by wet etching. .
- the pellicle film 301, the first frame body 311 and the second frame body 313 can be made of the same material as the pellicle film, the substrate and the second frame body 113 described above, detailed description is omitted. .
- the first frame body 311 and the second frame body 313 are fixed via an adhesive layer 341.
- the adhesive layer 341 is formed on the first surface 313A of the thick portion 315 of the second frame 313 having a thickness in a direction intersecting the surface of the first frame 311 on which the pellicle film 301 is disposed. Be placed.
- the side surface (inclined surface) of the first frame body 311 and the side surface of the thin portion 317 of the second frame body 313 in contact with the side surface (inclined surface) of the first frame body 311.
- An adhesive layer may be further disposed between the second surface 313 ⁇ / b> B which is an (inclined surface).
- the through hole 321 is disposed in the thick portion 315 of the second frame 313 having a thickness in a direction intersecting the surface of the first frame 311 on which the pellicle film 301 is disposed. Due to the limitations of the exposure apparatus, the upper limit of the height of the pellicle 300 is 2.5 mm, and the higher the height of the pellicle 300 is better from the prevention of foreign object image formation. However, according to known information, it is said that the height of the pellicle needs to be 2 mm (for example, Non-Patent Document 1).
- the through-hole 321 expands the pellicle film 301 due to the differential pressure inside and outside the pellicle 300.
- the diameter is less than 0.5 mm.
- the diameter of the through hole 321 is set in consideration of the upper limit value of the pressure loss generated in the through hole 321 when the pressure is reduced.
- the pressure loss generated in the through hole 321 when the pressure is reduced is desirably 1 Pa or less, and more desirably 0.5 Pa or less.
- the diameter of the through-hole 321 when the pressure loss inside and outside the pellicle 300 generated in the through-hole 321 is 1 Pa is 480 ⁇ m, and the number is four.
- the second surface 313B inside the portion 317 is inclined so that the thick portion 315 side is wider than the first surface 313A of the second frame 313, and the first frame 311 and the second frame 313 are inclined. High adhesion can be obtained.
- the upper surface of the pellicle film 301 and the upper surface of the second frame 313 are arranged on the same plane.
- An adhesive layer 343 is disposed on the bottom surface of the thick portion 315 of the second frame 313.
- the adhesive layer 343 is a means for fixing the pellicle 300 to the photomask.
- the thickness of the adhesive layer 343 is preferably as thin as possible within a range in which sufficient adhesion between the photomask and the second frame 313 can be secured, and is, for example, 10 ⁇ m or more and 300 ⁇ m or less. Since the adhesive used for the adhesive layer 343 can be the same adhesive as the adhesive layer 143, detailed description thereof is omitted.
- the pellicle film 301 is formed on the substrate 305 so as to have a film thickness of 20 nm to 50 nm by vapor deposition. Since EUV light is easily absorbed by any substance, the pellicle film 301 is preferably formed thin so as to have a transmittance of 90.0% or more for light with a wavelength of 5 nm to 30 nm.
- the pellicle film 301 according to the present invention is preferably 90.0% or more for light having a wavelength of about 5 nm to 13.5 nm, more preferably for light having a wavelength of 13.5 ⁇ 0.3 nm. It has transmittance.
- a through-hole 321 is formed in the thick portion 315 having a thickness in a direction intersecting the height direction of the second frame 313 (FIG. 8D). Due to the limitations of the exposure apparatus, the upper limit of the height of the pellicle 300 is 2.5 mm. However, according to known information, it is said that the height of the pellicle needs to be 2 mm (for example, Non-Patent Document 1). In view of the above, when the pressure is reduced from the normal pressure (0.1 MPa) to the vacuum state during exposure (10 ⁇ 4 to 10 ⁇ 6 Pa), the through-hole 321 expands the pellicle film 301 due to the differential pressure inside and outside the pellicle 300. The diameter is less than 0.5 mm. In the present embodiment, since the through hole 321 is covered with the filter 331, the diameter of the through hole 321 is set in consideration of the resistance due to the filter 331.
- the upper limit of the width of the filter 331 is the same as the width (height) of the second frame 313.
- the width (height) of the filter 331 exceeds the height of the second frame 313, the adhesive margin protrudes from the second frame 313, which is not preferable.
- the shape of the second frame 413 is different from that of the second frame 313.
- the second frame 413 is connected to the first surface 413A and the thick portion 415 including the first surface 413A that receives the surface opposite to the surface on which the pellicle film 401 of the first frame 411 is disposed.
- a second surface 413B that receives the side surface of the first frame body 411, and surrounds the pellicle film 401 and the first frame body 411.
- the second frame body 413 is connected to the first thin portion 417A of the second frame body 413 that is in contact with the side surface of the first frame body 411, and the lower surface of the thick portion 415, and the second frame body 413 is connected.
- the second thin portion 417B including the bottom surface of the first thin portion 417B.
- the second frame body surrounds the pellicle film and the first frame body on the first surface and the second surface, and fixes the first frame body via the adhesive layer.
- the extreme ultraviolet light is transmitted through the pellicle film and is incident on the photomask with the second frame disposed, and the incident extreme ultraviolet light corresponds to the extreme ultraviolet light according to the photomask pattern. Light and extreme ultraviolet light as stray light due to higher-order reflection or diffuse reflection are emitted. When extreme ultraviolet light incident on and / or emitted from the photomask hits the adhesive layer, the adhesive layer deteriorates.
- the first frame body 511 and the second frame body 513 are fixed via an adhesive layer 541.
- the adhesive layer 541 is disposed on the first surface 513A of the thick portion 515 of the second frame 513 having a thickness in a direction intersecting the surface of the first frame 511 on which the pellicle film 501 is disposed.
- An adhesive layer may be further disposed between the surface 513C.
- the second frame 613 has a distance from the second surface toward the surface of the first frame on which the pellicle film is disposed from the first surface.
- a protrusion having a third surface 613C that is inclined to be larger is provided.
- the protruding portion having the third surface 613C can block extreme ultraviolet light incident on and / or emitted from the photomask and can prevent the ultraviolet light from hitting the adhesive layer 641. For this reason, deterioration of the adhesive layer 641 due to extreme ultraviolet light can be suppressed.
- the pellicle film of the pellicle according to the present invention is an unprecedented thin film having a film thickness of 20 nm to 50 nm, and thus it is difficult to fix it to a photomask by hand like a conventional pellicle. . Therefore, non-contact sticking to a photomask is required using a dedicated sticking device.
- a non-contact sticking means to a photomask is provided in the second frame.
- FIG. 13 is a schematic view of the second frame 713 used in the pellicle 700 according to one embodiment of the present invention
- the upper diagram is a perspective view of the upper surface side of the second frame 713 and the lower diagram.
- the figure is a perspective view of the second frame body 713 on the bottom side.
- the pellicle 700 includes a first frame 711 on which the pellicle film 701 is arranged, and a second frame 713 on which the first frame 711 is fixed.
- the second frame 713 surrounds the pellicle film 701 and the first frame 711, and a cross section orthogonal to the pellicle film 701 has an L shape.
- the pellicle 700 includes a through hole 721 disposed in the second frame 713 and a filter 731 that covers the through hole 721.
- the through hole 721 is disposed in the thick part 715 of the second frame 713 having a thickness in a direction intersecting with the surface of the first frame 711 on which the pellicle film 701 is disposed.
- the filter 731 is disposed on the outer surface of the second frame 713 intersecting the surface of the first frame 711 on which the pellicle film 701 is disposed via an adhesive layer (not shown).
- a pressing force can be applied between the second frame body 713 and the first frame body 711, so that the front and back surfaces of the second frame body 713 and the first frame body 711 (that is, Without contacting the upper surface and the bottom surface of the thick portion 715 of the second frame body 713 and the surface of the first frame body 711 on which the pellicle film 701 is disposed and the bottom surface of the first frame body 711). Can be fixed.
- a through hole 721 is formed in the thick portion 715 having a thickness in a direction intersecting with the height direction of the second frame 713.
- the upper limit of the height of the pellicle 700 is 2.5 mm due to the limitations of the exposure apparatus, and the higher the height of the pellicle 700 is better from the prevention of foreign object image formation.
- the height of the pellicle 700 is said to be 2 mm (for example, Non-Patent Document 1).
- the through-hole 721 expands the pellicle film 701 due to the differential pressure inside and outside the pellicle 700.
- the diameter is less than 0.5 mm.
- the diameter of the through hole 721 is set in consideration of the resistance due to the filter 731.
- the filter 731 includes a ventilation portion and an adhesive margin portion (not shown).
- the margin part surrounds the periphery of the filter so as to cover the ventilation part.
- the glue margin part serves to bond the second frame body and the ventilation part without any gap. Gas does not pass through the glue margin.
- variety of a margin part is 0.2 mm or more and 1.0 mm or less. In order to increase the area of the ventilation portion, it is desirable that the width of the adhesive margin is as narrow as possible.
- An adhesive layer 741 is formed on the upper surface of the thick portion 715 of the second frame 713. At this time, the adhesive layer 741 is formed so that the groove 714 provided on the upper surface of the thick portion 715 of the second frame 713 is not covered with the adhesive layer 741.
- the first frame 711 is fixed to the second frame 713 via the formed adhesive layer 741 so as to surround the first frame 711. At this time, in order to reinforce the adhesive layer 741, for example, an adhesive layer is provided between the side surface of the first frame body 711 and the thin portion 717 of the second frame body 713 in contact with the side surface of the first frame body 711. Further, it may be arranged.
- the step of fixing the first frame 711 to the second frame 713 is performed using, for example, the pellicle manufacturing apparatus 1000 shown in FIG.
- the pellicle manufacturing apparatus 1000 includes a vacuum chamber 1100, a mounting table 1200 disposed in the vacuum chamber 1100, a supply pipe 1110 for supplying gas to the vacuum chamber 1100, and the gas in the vacuum chamber 1100 outside the vacuum chamber 1100.
- Discharge pipes 1120A and 1120B. Ends (not shown) of the discharge pipes 1120A and 1120B outside the vacuum chamber 1100 are connected to exhaust means (not shown) such as a vacuum pump.
- the second frame 713 is mounted on the mounting table 1200 in the vacuum chamber 1100. Specifically, the liner 751 of the second frame 713 and the mounting table 1200 are placed in contact with each other. A composite member of the pellicle film 701 and the first frame body 711 is disposed on the adhesive layer 741 of the second frame body 713.
- a composite member of a first frame body 711 that is a silicon wafer (for example, an 8-inch silicon wafer) and a pellicle film 701 that is a polycrystalline silicon film (p-Si film) is used as a composite member.
- a notch for cutting the first frame 711 into a predetermined size is provided at a predetermined position of the composite member.
- the first frame body 711 is preferably cut into a predetermined size before being bonded to the second frame body 713 (hereinafter, this operation is also referred to as “trimming”).
- discharge pipes 1120A and 1120B each have an end portion in the vacuum chamber 1100. These end portions can be connected to two through holes 714A and 714B for decompressing the inside of the groove 714 of the second frame 713, respectively.
- the second frame 713 is mounted on the mounting table 1200 in the vacuum chamber 1100, and the first frame 711 is disposed above the second frame 713.
- the adhesive layer 741 and the first frame 711 are arranged so as not to contact each other.
- the second frame 713 and the first frame 711 are positioned by a known means.
- the first frame body 711 is arranged to be fitted by the opening surrounded by the second frame body 713.
- the respective end portions of the discharge pipes 1120A and 1120B are connected to two through holes 714A and 714B for decompressing the inside of the groove 714 of the second frame body 713 (frame body), respectively.
- the inside of the vacuum chamber 1100 is pressurized by supplying gas from the supply pipe 1110 into the vacuum chamber 1100.
- a vacuum pump (not shown) connected to the outside of the vacuum chamber 1100 of the discharge pipes 1120A and 1120B, the two penetrations of the discharge pipes 1120A and 1120B and the second frame 713
- the inside of the groove 714 provided on the upper surface of the thick portion 715 of the second frame 713 is decompressed through the holes 714A and 714B.
- the degree of pressurization and depressurization is between the first frame 711 and the second frame 713 caused by the difference (differential pressure) between the total pressure in the vacuum chamber 1100 and the pressure in the groove 714.
- the pressing force (the force applied to the entire second frame 713) is adjusted to be, for example, about 2N. Due to the differential pressure, a pressing force is generated between the first frame 711 and the second frame 713, and the adhesive layer 741 of the second frame 713 and the first frame 711 are bonded. .
- first frame body 711 and the second frame body 713 can be bonded together without contacting the front surface and the back surface. Note that the order of the above operations can be changed as appropriate.
- the method of arranging the pellicle on the photomask of the present embodiment is a surface that supports the first frame body 711 in which at least the pellicle film 701 of the second frame body 713 is disposed in the pellicle 700 of the present embodiment. Disposing the pellicle provided with the groove 716 on the opposite surface to the photomask and the photomask so that the surface of the second frame 713 provided with the groove 716 and the photomask face each other. And a fixing step of fixing the pellicle 700 and the photomask by decompressing the inside of the groove 716 through the through holes 716A and 716B.
- the pressing force between the pellicle 700 and the photomask can be exerted by reducing the pressure inside the groove 716. And it can fix both, without contacting a back surface.
- the pressure reduction in the fixing step is preferably performed in a state where the pellicle 700 and the photomask are arranged in a pressurized atmosphere.
- the difference (differential pressure) between the pressure of the entire atmosphere in which the pellicle 700 and the photomask are disposed and the pressure inside the groove 716 can be increased, the pellicle 700 and the photomask The pressing force between the two can be increased. For this reason, both can be fixed more easily.
- the pressing force between the pellicle 700 and the photomask (the force applied to the entire second frame 713) is preferably 1N or more, and more preferably 2N or more.
- the pressing force between the pellicle 700 and the photomask (the force applied to the entire second frame 713) is more preferably 10N or more, and particularly preferably 20N or more.
- the upper limit of the pressing force between the pellicle 700 and the photomask is not particularly limited, but is, for example, 500 N, preferably 400 N from the viewpoint of productivity. .
- FIG. 15 is a cross-sectional view conceptually showing an example of a photomask manufacturing apparatus 2000 suitable for the pellicle placement method on the photomask of this embodiment.
- a photomask manufacturing apparatus 2000 shown in FIG. 15 includes a vacuum chamber 2100, a supply pipe 2110 for supplying gas to the vacuum chamber 2100, and a discharge pipe 2120A for discharging the gas in the vacuum chamber 2100 to the outside of the vacuum chamber 2100. And 2120B. Ends (not shown) of the discharge pipes 2120A and 2120B outside the vacuum chamber 2100 are connected to exhaust means (not shown) such as a vacuum pump.
- discharge pipes 2120A and 2120B each have an end portion in the vacuum chamber 2100. Each of these end portions can be connected to two through holes for decompressing the inside of the groove 716 provided on the bottom surface of the second frame body 713.
- the pellicle 700 is disposed above the photomask 2500.
- the film surface of the pellicle 700 is , Arrange them so that jigs, hands, etc. do not touch.
- the adhesive layer 743 and the photomask 2500 are arranged so as not to contact each other.
- the pellicle 700 and the photomask 2500 are positioned by a known means.
- the respective end portions of the discharge pipes 2120A and 2120B are connected to two through holes for decompressing the inside of the groove 716 on the bottom side of the second frame body 713, respectively.
- the inside of the vacuum chamber is pressurized by supplying gas from the supply pipe 2110 into the vacuum chamber 2100.
- a vacuum pump (not shown) connected to the outside of the vacuum chamber 2100 of the discharge pipes 2120A and 2120B, the two penetrations of the discharge pipes 2120A and 2120B and the second frame 713
- the inside of the groove 716 provided in the bottom surface of the second frame 713 is decompressed through the holes 716A and 716B.
- the degree of pressurization and depressurization depends on the pressing force between the pellicle 700 and the photomask 2500 (second pressure) generated by the difference (differential pressure) between the total pressure in the vacuum chamber 2100 and the pressure in the groove 716.
- the force applied to the entire frame 713 is adjusted to be about 2N, for example.
- the pressure difference causes a pressing force between the pellicle 700 and the photomask 2500, and the adhesive layer 743 of the pellicle 700 and the photomask 2500 are bonded.
- the pellicle 700 and the photomask 2500 can be bonded together without contacting the front and back surfaces. Thereby, both can be adhered while suppressing adhesion of foreign matter to the pellicle 700 and the photomask 2500. Note that the order of the above operations can be changed as appropriate.
- the pellicle 700 is formed by bonding the first frame body 711 and the second frame body 713 and then arranged on the photomask 2500.
- the method of arranging the pellicle on the photomask according to the present invention is not limited to this, and the order can be changed. As an example, an example in which a pellicle is completed by bonding the first frame to the second frame after the second frame is arranged on the photomask will be described.
- the pressing force between the second frame 713 and the photomask is preferably 1N or more, and more preferably 2N or more.
- the pressing force between the second frame 713 and the photomask is more preferably 10N or more, and particularly preferably 20N or more.
- the upper limit of the pressing force between the second frame 713 and the photomask is not particularly limited, but is, for example, 500 N, preferably 400 N from the viewpoint of productivity.
- FIG. 16 is a cross-sectional view conceptually showing an example of a photomask manufacturing apparatus 3000 suitable for the method of arranging the pellicle on the photomask of this embodiment.
- a second frame 713 obtained by removing the liner 751 is prepared.
- the photomask 3500 is disposed in the vacuum chamber 3100 so that the front surface (light irradiation surface) faces upward.
- a machine, a jig, Arrange so that hands do not touch.
- the respective end portions of the discharge pipes 3120A and 3120B are connected to two through holes for decompressing the inside of the groove 716 on the bottom side of the second frame body 713, respectively.
- the inside of the vacuum chamber 3100 is pressurized by supplying gas from the supply pipe 3110 into the vacuum chamber 3100.
- a vacuum pump (not shown) connected to the end of the discharge pipes 3120A and 3120B outside the vacuum chamber 3100, the two penetrations of the discharge pipes 3120A and 3120B and the second frame 713 are performed.
- the inside of the groove 716 provided in the bottom surface of the second frame 713 is decompressed through the holes 716A and 716B.
- the degree of pressurization and depressurization is the pressing force between the second frame 713 and the photomask 3500 generated by the difference (differential pressure) between the total pressure in the vacuum chamber 3100 and the pressure in the groove 716. Is adjusted to be, for example, about 2N.
- the pressure difference causes a pressing force between the second frame 713 and the photomask 3500, and the adhesive layer 743 of the pellicle 700 and the photomask 3500 are bonded.
- the inside of the vacuum chamber 3100 is pressurized by supplying gas from the supply pipe 3110 into the vacuum chamber 3100.
- a vacuum pump (not shown) connected to the end of the discharge pipes 3220A and 3220B outside the vacuum chamber 3100, the two penetrations of the discharge pipes 3220A and 3220B and the second frame 713 are performed.
- the inside of the groove 714 provided on the upper surface of the thick portion 715 of the second frame 713 is decompressed through the holes 714A and 714B.
- the degree of pressurization and depressurization is between the first frame 711 and the second frame 713 caused by the difference (differential pressure) between the overall pressure in the vacuum chamber 3100 and the pressure in the groove 714.
- the pellicle film of the pellicle according to the present invention is an unprecedented thin film having a thickness of 20 nm to 50 nm, it is difficult to fix the pellicle film to the photomask by hand like the conventional pellicle. Therefore, non-contact pasting is required using a dedicated pasting device.
- EUV light of 5 nm to 30 nm is irradiated onto the photomask on which the pellicle is arranged. Since the photomask has a multilayer reflective film formed below the reticle surface, EUV light incident on the reticle surface is reflected by the multilayer reflective film, and EUV light reflecting the pattern formed by the absorber on the reticle surface is reflected. The light passes through the pellicle from the reticle surface and exits.
Abstract
Description
式(1)中、Iは透過光強度、I0は入射光強度を示す。透過光強度I及び入射光強度I0、ペリクル膜の厚みd、密度ρ、及びペリクル膜の質量吸収係数μには、以下の式(2)で表される関係が成り立つ。
上記Wiは、Wi=niAi/ΣniAiで求められる値である。Aiは各元素iの原子量、niは各元素iの数である。
図1は、本発明の一実施形態に係るペリクル100の模式図(斜視図)ある。図2は、ペリクル100の図1の線分AA’における断面図である。ペリクル100は、ペリクル膜101を配置した第1の枠体111と、第1の枠体111を固定した第2の枠体113を備える。第2の枠体113は、第1の枠体111のペリクル膜101が配置された面とは反対側の面を受ける第1の面113Aを含む厚手部115と、第1の面113Aに接続し、第1の枠体111の側面を受ける第2の面113Bと、を有し、ペリクル膜101と第1の枠体111とを外囲する。第2の枠体113は、ペリクル膜101と直交する断面がL字形状を有する。また、ペリクル100は、第2の枠体113に配置された貫通孔121と、貫通孔121を覆うフィルタ131を備える。貫通孔121は、ペリクル膜101が配置された第1の枠体111の面と交差する方向に厚みを有する第2の枠体113の厚手部115に配置される。フィルタ131は、ペリクル膜101が配置された第1の枠体111の面と交差する第2の枠体113の外側の側面に接着層(図示せず)を介して配置される。
本実施形態に係るペリクル100は、例えば、図4及び図5を参照し、以下のように製造することができる。なお、以下の製造工程は一例であって、必要に応じて製造工程の順序を変更することもできる。図4及び図5は、ペリクル100の製造工程を示す図である。基板105を準備し、基板105上にペリクル膜101を形成する(図4(a))。基板105には、上述したように、例えば、シリコン基板、サファイア基板、炭化ケイ素基板等を用いることができるが、これらに限定されるものではない。
図17(b)のペリクル900に示したように、第1の枠体111をウエットエッチングにより形成した場合、第1の枠体911の側面に傾斜が生じ、断面が台形状になる。この場合、実施形態1に示した第2の枠体113を用いると、第1の枠体側面と第2の枠体の内側の側面との間に隙間が生じてしまう。本実施形態においては、ウエットエッチングにより形成した第1の枠体に適合した第2の枠体を用いる例について説明する。
本実施形態に係るペリクル300は、例えば、図8及び図9を参照し、以下のように製造することができる。なお、以下の製造工程は一例であって、必要に応じて製造工程の順序を変更することもできる。図8及び図9は、ペリクル300の製造工程を示す図である。基板305を準備し、基板305上にペリクル膜301を形成する(図8(a))。基板305には、上述したように、例えば、シリコン基板、サファイア基板、炭化ケイ素基板等を用いることができるが、これらに限定されるものではない。
上述した実施形態では第2の枠体は、第1の面と第2の面で、ペリクル膜と第1の枠体を外囲し、接着層を介して第1の枠体を固定する。一方、本発明に係るペリクルは、ペリクル膜を透過して極端紫外光が第2の枠体が配置されてフォトマスクに入射し、その入射した極端紫外光がフォトマスクのパターンに応じた極端紫外光、及び高次反射もしくは拡散反射による迷光としての極端紫外光を出射する。フォトマスクに入射及び/又は出射する極端紫外光が接着層に当たると、接着層が劣化する。
上述した実施形態において、本発明に係るペリクルのペリクル膜は膜厚が20nm以上50nm以下の従来にない薄い膜であるため、従来のペリクルのように手でフォトマスクに固定することは困難である。したがって、専用の貼付け装置を用いて、非接触でのフォトマスクへの貼付けが必要となる。本実施形態においては、非接触でのフォトマスクへの貼付け手段を第2の枠体に設ける例について説明する。
本実施形態のペリクル700の製造方法の基本的な工程は、実施形態1及び2と同様である。実施形態1又は2と同様に、第1の枠体711を形成する。
本実施形態のフォトマスクへのペリクルの配置方法は、一例として、本実施形態のペリクル700であって第2の枠体713の少なくともペリクル膜701を配置した第1の枠体711を支持する面とは反対側の面に溝716が設けられているペリクルと、フォトマスクと、を第2の枠体713の溝716が設けられている面とフォトマスクとが対向するように配置する配置工程と、貫通孔716A及び716Bを通じて溝716の内部を減圧することにより、ペリクル700とフォトマスクとを固定する固定工程と、を有する。
上述したフォトマスクへのペリクルの配置方法では、第1の枠体711と第2の枠体713を接着してペリクル700を形成した後に、フォトマスク2500に配置した。しかし、本発明に係るフォトマスクへのペリクルの配置方法は、これに限定されるものではなく、順序を入れ替えることも可能である。一例として、第2の枠体をフォトマスクに配置した後に、第2の枠体に第1の枠体を接着してペリクルを完成させる例について説明する。
上述した実施形態に係るペリクルを用いて、極端紫外光リソグラフィによる微細加工を実現することができる。本発明に係るペリクルをフォトマスクのレチクル面に配置し、フォトマスクを露光装置の所定の位置に配置して、レチクル面から3mm以下の距離を有する空隙にペリクルを収容し、真空下で、ペリクルを配置したフォトマスクに5nm以上30nm以下の光を照射し、ペリクルを配置したフォトマスクのレチクル面から出射した光をレジスト層が形成された基材に照射することにより、レジストにパターンを露光することができる。
Claims (21)
- ペリクル膜を配置した第1の枠体と、
前記第1の枠体の前記ペリクル膜が配置された面とは反対側の面を受ける第1の面を含む厚手部と、前記第1の面に接続し、前記第1の枠体の側面を受ける第2の面と、を有し、
前記ペリクル膜と前記第1の枠体とを外囲する第2の枠体と、
前記第2の枠体の前記厚手部に配置された貫通孔と、
前記ペリクル膜が配置された前記第1の枠体の面と交差する前記第2の枠体の外側の側面に配置され、前記貫通孔を覆うフィルタと、を備えることを特徴とするペリクル。 - 前記第1の枠体と係合する前記第2の枠体の前記第2の面が、前記ペリクル膜が配置された前記第1の枠体の面に対して直角となることを特徴とする請求項1に記載のペリクル。
- 前記第1の枠体と係合する前記第2の枠体の前記第2の面が、前記ペリクル膜が配置された前記第1の枠体の面に対して内側に傾斜することを特徴とする請求項1に記載のペリクル。
- 前記第2の枠体が、前記第1の面に接続し、前記第2の面と向かい合う第3の面をさらに有し、
前記第2の枠体の前記第3の面は、前記第1の枠体の内側の側面と対向して配置されることを特徴とする請求項1に記載のペリクル。 - 前記第1の枠体と係合する前記第2の枠体の前記第3の面が、前記ペリクル膜が配置された前記第1の枠体の面に対して直角となることを特徴とする請求項4に記載のペリクル。
- 前記第1の枠体と係合する前記第2の枠体の前記第3の面は、前記第1の面から前記ペリクル膜が配置された前記第1の枠体の面に向かって、前記第2の面との距離が大きくなるように傾斜することを特徴とする請求項4に記載のペリクル。
- 前記第1の枠体と前記第2の枠体の厚手部とは、接着層を介して接着されることを特徴とする請求項1に記載のペリクル。
- 前記ペリクル膜は5nm以上30nm以下の波長の光に90.0%以上の透過率を有し、膜厚が20nm以上50nm以下であることを特徴とする請求項1に記載のペリクル。
- 前記第2の枠体の高さと、前記第2の枠体の下面に配置された接着層の高さとの合計が、2mm以下であることを特徴とする請求項1に記載のペリクル。
- 前記第1の枠体は、シリコン、サファイア及び炭化ケイ素からなる群から選択される材料で構成されることを特徴とする請求項1に記載のペリクル。
- 前記ペリクルの内部の体積に対する前記フィルタの通気部の合計面積の比率が0.007mm-1以上0.026mm-1以下であることを特徴とする請求項1に記載のペリクル。
- 基板上にペリクル膜を形成し、
前記基板が枠形状となるように、前記ペリクル膜を露出させて第1の枠体を形成し、
前記第1の枠体の前記ペリクル膜が配置された面とは反対側の面を受ける第1の面を含む厚手部と、前記第1の面に接続し、前記第1の枠体の側面を受ける第2の面と、を有する第2の枠体を準備し、
前記第2の枠体の前記厚手部に貫通孔を形成し、
前記第2の枠体の高さ方向と平行な前記第2の枠体の外側の面に前記貫通孔を覆うフィルタを接着し、
前記第1の枠体を外囲するように、接着層を介して前記第1の枠体を前記第2の枠体に固定することを特徴とするペリクルの製造方法。 - ドライエッチングにより前記ペリクル膜を露出させ、
前記第2の面が、前記ペリクル膜が形成された前記第1の枠体の面に対して直角となる前記第2の枠体を準備し、
前記接着層を介して前記第1の枠体を前記第2の枠体に固定することを特徴とする請求項12に記載のペリクルの製造方法。 - ウエットエッチングにより前記ペリクル膜を露出させ、
前記第2の面が、前記ペリクル膜が形成された前記第1の枠体の面に対して内側に傾斜する前記第2の枠体を準備し、
前記接着層を介して前記第1の枠体を前記第2の枠体に固定することを特徴とする請求項12に記載のペリクルの製造方法。 - ドライエッチングにより前記ペリクル膜を露出させ、
前記第2の面と、前記第1の面に接続し、前記第2の面と向かい合う第3の面とが、前記ペリクル膜が形成された前記第1の枠体の面に対して直角となる前記第2の枠体を準備し、
前記接着層を介して前記第1の枠体を前記第2の枠体に固定することを特徴とする請求項12に記載のペリクルの製造方法。 - ウエットエッチングにより前記ペリクル膜を露出させ、
前記ペリクル膜が形成された前記第1の枠体の面に対して内側に傾斜する第2の面と、前記第1の面から前記ペリクル膜が配置された前記第1の枠体の面に向かって、前記第2の面との距離が大きくなるように傾斜する第3の面を有する前記第2の枠体を準備し、
前記接着層を介して前記第1の枠体を前記第2の枠体に固定することを特徴とする請求項12に記載のペリクルの製造方法。 - 膜厚が20nm以上50nm以下となる前記ペリクル膜を前記基板上に形成し、
前記ペリクル膜は5nm以上30nm以下の波長の光に90.0%以上の透過率を有することを特徴とする請求項12に記載のペリクルの製造方法。 - 前記第2の枠体の高さと、前記第2の枠体の下面に配置された接着層の高さとの合計を2mm以下とすることを特徴とする請求項12に記載のペリクルの製造方法。
- 前記基板は、シリコン基板、サファイア基板及び炭化ケイ素基板からなる群から選択される基板であることを特徴とする請求項12に記載のペリクルの製造方法。
- 前記ペリクルの内部の体積に対する前記フィルタの通気部の合計面積の比率を0.007mm-1以上0.026mm-1以下とすることを特徴とする請求項12に記載のペリクルの製造方法。
- 請求項1に記載のペリクルをフォトマスクのレチクル面に配置し、
前記フォトマスクを露光装置の所定の位置に配置して、前記レチクル面から3mm以下の距離を有する空隙に前記ペリクルを収容し、
真空下で、前記ペリクルを配置した前記フォトマスクに5nm以上30nm以下の波長の光を照射し、
前記ペリクルを配置した前記フォトマスクの前記レチクル面から出射した光をレジスト層が形成された基材に照射することを特徴とする露光方法。
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- 2015-09-17 WO PCT/JP2015/076568 patent/WO2016043292A1/ja active Application Filing
- 2015-09-17 CN CN202111214914.4A patent/CN113917783B/zh active Active
- 2015-09-17 KR KR1020177005999A patent/KR101915912B1/ko active IP Right Grant
- 2015-09-17 SG SG11201701805QA patent/SG11201701805QA/en unknown
- 2015-09-17 CN CN201580046947.9A patent/CN106662806B/zh active Active
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2017
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CN106662806A (zh) | 2017-05-10 |
TWI693467B (zh) | 2020-05-11 |
SG11201701805QA (en) | 2017-04-27 |
EP3196699A4 (en) | 2018-05-16 |
US20170184956A1 (en) | 2017-06-29 |
KR101915912B1 (ko) | 2018-11-06 |
US10488751B2 (en) | 2019-11-26 |
EP3196699A1 (en) | 2017-07-26 |
JPWO2016043292A1 (ja) | 2017-06-29 |
TW201612622A (en) | 2016-04-01 |
CN113917783A (zh) | 2022-01-11 |
KR20170038907A (ko) | 2017-04-07 |
CN106662806B (zh) | 2021-11-05 |
CN113917783B (zh) | 2023-12-19 |
JP6275270B2 (ja) | 2018-02-07 |
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