WO2013141268A1 - 多層反射膜付き基板、euvリソグラフィー用反射型マスクブランク、euvリソグラフィー用反射型マスクの製造方法、及び半導体装置の製造方法 - Google Patents
多層反射膜付き基板、euvリソグラフィー用反射型マスクブランク、euvリソグラフィー用反射型マスクの製造方法、及び半導体装置の製造方法 Download PDFInfo
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- WO2013141268A1 WO2013141268A1 PCT/JP2013/057957 JP2013057957W WO2013141268A1 WO 2013141268 A1 WO2013141268 A1 WO 2013141268A1 JP 2013057957 W JP2013057957 W JP 2013057957W WO 2013141268 A1 WO2013141268 A1 WO 2013141268A1
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- Prior art keywords
- film
- substrate
- alloy
- multilayer reflective
- reflective film
- Prior art date
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- 239000000758 substrate Substances 0.000 title claims abstract description 102
- 238000001900 extreme ultraviolet lithography Methods 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 35
- 239000004065 semiconductor Substances 0.000 title description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 98
- 239000000956 alloy Substances 0.000 claims abstract description 75
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 75
- 238000001312 dry etching Methods 0.000 claims abstract description 28
- 239000006104 solid solution Substances 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 150000002739 metals Chemical class 0.000 claims abstract description 5
- 239000006096 absorbing agent Substances 0.000 claims description 59
- 239000000460 chlorine Substances 0.000 claims description 31
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical group [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 26
- 229910052707 ruthenium Inorganic materials 0.000 claims description 26
- 238000012546 transfer Methods 0.000 claims description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 18
- 239000010949 copper Substances 0.000 claims description 18
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 14
- 229910052801 chlorine Inorganic materials 0.000 claims description 14
- 229910052702 rhenium Inorganic materials 0.000 claims description 14
- 229910017052 cobalt Inorganic materials 0.000 claims description 12
- 239000010941 cobalt Substances 0.000 claims description 12
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 10
- 229910052709 silver Inorganic materials 0.000 claims description 10
- 239000004332 silver Substances 0.000 claims description 10
- 229910052715 tantalum Inorganic materials 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- 229910052732 germanium Inorganic materials 0.000 claims description 8
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 6
- 239000010931 gold Substances 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 5
- 150000003482 tantalum compounds Chemical class 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 abstract description 35
- 239000010408 film Substances 0.000 description 299
- 239000007789 gas Substances 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 22
- 230000015572 biosynthetic process Effects 0.000 description 14
- 229910052796 boron Inorganic materials 0.000 description 12
- 150000001875 compounds Chemical class 0.000 description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 9
- 230000000737 periodic effect Effects 0.000 description 9
- 239000011521 glass Substances 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 238000004544 sputter deposition Methods 0.000 description 8
- 229910052726 zirconium Inorganic materials 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 7
- 238000005530 etching Methods 0.000 description 7
- 238000001755 magnetron sputter deposition Methods 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000000470 constituent Substances 0.000 description 5
- 238000001659 ion-beam spectroscopy Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
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- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910000929 Ru alloy Inorganic materials 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910004535 TaBN Inorganic materials 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 3
- 238000000560 X-ray reflectometry Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 239000006061 abrasive grain Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
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- 238000005660 chlorination reaction Methods 0.000 description 2
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- 238000001459 lithography Methods 0.000 description 2
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- 238000005498 polishing Methods 0.000 description 2
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001374 Invar Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910001362 Ta alloys Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
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- 239000001307 helium Substances 0.000 description 1
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- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
- 229910000500 β-quartz Inorganic materials 0.000 description 1
Images
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
- 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
- G03F1/22—Masks or mask blanks for imaging by radiation of 100nm or shorter wavelength, e.g. X-ray masks, extreme ultraviolet [EUV] masks; Preparation thereof
- G03F1/24—Reflection masks; Preparation thereof
-
- 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
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/38—Masks having auxiliary features, e.g. special coatings or marks for alignment or testing; Preparation thereof
- G03F1/48—Protective coatings
-
- 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
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0332—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their composition, e.g. multilayer masks, materials
-
- 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
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0334—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/0337—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
Definitions
- the present invention uses a substrate with a multilayer reflective film in which loss of a protective film due to dry etching using a chlorine-based gas and subsequent wet cleaning is very small, a reflective mask blank for EUV lithography obtained from the substrate, and the mask blank
- the present invention relates to a method for manufacturing a reflective mask for EUV lithography, and a method for manufacturing a semiconductor device using the reflective mask for EUV lithography obtained by the manufacturing method.
- EUV lithography which is an exposure technique using extreme ultraviolet (Extreme Ultra Violet, hereinafter referred to as EUV) light with a shorter wavelength is promising.
- EUV light refers to light in the wavelength band of the soft X-ray region or the vacuum ultraviolet region, and specifically refers to light having a wavelength of about 0.2 to 100 nm.
- a multilayer reflective film that reflects EUV light and an absorber film that absorbs EUV light are sequentially formed on a substrate such as glass or silicon, and the absorber film and the multilayer reflective film.
- a protective film for protecting the multilayer reflective film is formed when a transfer pattern is formed on the absorber film.
- a predetermined transfer pattern is formed on the absorber film.
- light incident on a reflective mask is absorbed at a portion having an absorber film pattern and reflected by a multilayer reflective film at a portion without an absorber film pattern.
- the reflected light image is transferred onto a transfer medium such as a silicon wafer through a reflection optical system.
- a resist pattern is formed on the absorber film of an EUV reflective mask blank in which the multilayer reflective film, the protective film, and the absorber film are formed in this order on the substrate. Then, using the resist pattern as a mask, the absorber film is etched by dry etching or the like, and the resist pattern is removed (for example, when the absorber film is a Ta-based material, the absorber film is dried by Cl-based gas dry etching). Form a pattern).
- a protective film is generally provided on the multilayer reflective film.
- a protective film made of Ru has been proposed (patent) Reference 1).
- the protection is made of Ru alloy with Zr or B added to Ru A film has been proposed (Patent Document 2).
- the Ru protective film described in Patent Documents 1 and 2 and the Ru alloy protective film of Ru- (Zr, B) are remarkably thin after the mask cleaning, and in some cases, all of the protective film disappears. A problem occurs.
- the present inventors examined the reduction or disappearance of this protective film, and Ru chloride or Ru- (Zr, B) chloride was generated by the Cl-based gas used when forming the absorber film pattern, followed by chemical cleaning. Thus, it was confirmed by an SEM photograph that the Ru protective film or the Ru- (Zr, B) protective film was reduced or disappeared together with the Ru chloride or Ru- (Zr, B) chloride.
- the present invention is a substrate with a multilayer reflective film used for manufacturing a reflective mask blank for EUV lithography in which dry etching using a Cl-based gas is performed, and the protective film formed by the dry etching and subsequent wet cleaning is used.
- An object of the present invention is to provide a substrate with a multilayer reflective film with very little loss.
- the present invention is obtained by a reflective mask blank for EUV lithography manufactured using the substrate with a multilayer reflective film, a manufacturing method of a reflective mask for EUV lithography using the mask blank, and the manufacturing method. It is another object of the present invention to provide a method for manufacturing a semiconductor device using a mask.
- the present invention is a substrate with a multilayer reflective film used for the production of a reflective mask blank for EUV lithography
- the substrate with a multilayer reflective film includes a substrate, a multilayer reflective film that reflects EUV light formed on the substrate, and a protective film that protects the multilayer reflective film formed on the multilayer reflective film.
- the protective film is made of an alloy containing at least two kinds of metals, and the alloy is a solid solution with a total percentage.
- the alloy includes an alloy composed of ruthenium (Ru) and cobalt (Co), an alloy composed of ruthenium (Ru) and rhenium (Re), an alloy composed of nickel (Ni) and copper (Cu), and gold (Au).
- the content of ruthenium (Ru) in the alloy is 75 atomic% or more and 99.5. It is preferably at most atomic%.
- the present invention provides a reflective mask blank for EUV lithography, comprising the substrate with a multilayer reflective film and an absorber film that absorbs EUV light and is formed on a protective film on the substrate.
- the absorber film is usually made of a material that can be etched by dry etching with chlorine (Cl) gas, and preferably made of a tantalum compound containing tantalum (Ta).
- the present invention is characterized in that the absorber film of the reflective mask blank for EUV lithography is etched by dry etching with a chlorine (Cl) gas to form an absorber film pattern on the protective film.
- a method of manufacturing a reflective mask for EUV lithography is provided.
- the present invention further includes a step of forming a transfer pattern on a transfer object using the reflective mask for EUV lithography obtained by the method for manufacturing a reflective mask for EUV lithography.
- a manufacturing method is provided.
- a substrate with a multilayer reflective film used for manufacturing a reflective mask blank for EUV lithography in which dry etching using a Cl-based gas is performed, and the protective film by the dry etching and subsequent wet cleaning Substrate with a multilayer reflective film with a very low loss, a reflective mask blank for EUV lithography manufactured using the substrate with the multilayer reflective film, a method for manufacturing a reflective mask for EUV lithography using the mask blank, and A method of manufacturing a semiconductor device using a mask obtained by the manufacturing method is provided.
- FIG. 1 It is a schematic diagram of the board
- FIG. 1 is a schematic view showing a substrate with a multilayer reflective film of the present invention.
- the substrate 1 used for the multilayer reflective film-coated substrate 10 of the present invention has a low thermal expansion coefficient (0 ⁇ 1.0 ⁇ 10 ⁇ 7 / ° C.) in order to prevent distortion of the absorber film pattern due to heat during exposure. Within the range, more preferably within the range of 0 ⁇ 0.3 ⁇ 10 ⁇ 7 / ° C.), and excellent in smoothness and flatness and resistance to acidic and alkaline aqueous solutions.
- a low thermal expansion glass such as TiO 2 —SiO 2 glass is used.
- crystallized glass on which ⁇ quartz solid solution is deposited, quartz glass, silicon, or a metal substrate can be used. Examples of the metal substrate include Invar alloy (Fe—Ni alloy).
- the substrate 1 has a smooth surface of 0.2 nmRms or less and a flatness of 100 nm or less in order to obtain high reflectivity and high transfer accuracy in a reflective mask for EUV lithography obtained from the substrate 10 with a multilayer reflective film. Is preferable.
- the substrate 1 preferably has high rigidity in order to prevent deformation due to film stress of a film (such as the multilayer reflective film 2) formed thereon.
- the substrate 1 preferably has a high Young's modulus of 65 GPa or more.
- the unit Rms indicating smoothness is the root mean square roughness, and can be measured with an atomic force microscope.
- the flatness is a value representing a warp (deformation amount) of the surface indicated by TIR (Total Indicated Reading), and a plane determined by the least square method with respect to the substrate surface is defined as a focal plane. It is the absolute value of the difference in height between the highest position of the substrate surface above and the lowest position of the substrate surface below the focal plane.
- the flatness is a measured value in an area of 142 mm ⁇ 142 mm.
- the multilayer reflective film 2 is formed on the substrate 1 described above.
- This film 2 gives a function of reflecting EUV light in a reflective mask for EUV lithography, and has a multilayer film structure in which elements having different refractive indexes are periodically stacked.
- the material of the multilayer reflective film 2 is not particularly limited as long as it reflects EUV light. However, the reflectance of the multilayer reflective film 2 is usually 65% or more, and the upper limit is usually 73%.
- Such a multilayer reflective film 2 is generally a multilayer film in which thin films of heavy elements or their compounds and thin films of light elements or their compounds are alternately stacked for about 40 to 60 cycles.
- the multilayer reflective film 2 for EUV light having a wavelength of 13 to 14 nm a Mo / Si periodic laminated film in which Mo films and Si films are alternately laminated for about 40 periods is preferably used.
- a multilayer reflective film used in the EUV light region Ru / Si periodic multilayer film, Mo / Be periodic multilayer film, Mo compound / Si compound periodic multilayer film, Si / Nb periodic multilayer film, Si / Mo / Examples include Ru periodic multilayer films, Si / Mo / Ru / Mo periodic multilayer films, and Si / Ru / Mo / Ru periodic multilayer films.
- the material of the multilayer reflective film 2 and the thickness of each constituent film may be appropriately selected depending on the exposure wavelength, and the thickness is selected so as to satisfy Bragg's law. Also, which film is the film in contact with the substrate 1 in the multilayer reflective film 2 and which film is the film in contact with the protective film 3 formed on the multilayer reflective film 2 depends on the reflectance characteristics at the exposure wavelength. Etc. are selected as appropriate.
- the method of forming the multilayer reflective film 2 is known in the art, but can be formed by depositing each layer by, for example, magnetron sputtering or ion beam sputtering.
- an Si film having a thickness of about several nanometers is first formed on the substrate 1 using an Si target, for example, by ion beam sputtering, and then the number of thicknesses using an Mo target.
- a Mo film having a thickness of about nm is formed, and this is taken as one period, and laminated for 40 to 60 periods to form the multilayer reflective film 2.
- the multilayer reflective film 2 is formed.
- the substrate with film 10 is completed.
- the present inventors examined the reduction or disappearance of the protective film, and a chloride was generated by the Cl-based gas used at the time of forming the absorber film pattern. It was found that the protective film or the Ru- (Zr, B) protective film was reduced or disappeared.
- the means for preventing such a chloride from being generated in the protective film by dry etching is repeatedly studied, and an alloy containing at least two kinds of metals, which is a solid solution, is used as the protective film 3. It has been found that the loss can be suppressed very effectively and damage to the multilayer reflective film 2 can be prevented.
- the total solid solution is an alloy in which each constituent metal melts at any concentration in both a liquid phase state and a solid phase state.
- An alloy that is a solid solution of all percentages is very stable and is not easily chlorinated by dry etching using a Cl-based gas.
- an alloy that is a solid solution for example, an alloy composed of ruthenium (Ru) and cobalt (Co), an alloy composed of ruthenium (Ru) and rhenium (Re), and composed of nickel (Ni) and copper (Cu) Alloys, alloys composed of gold (Au) and silver (Ag), alloys composed of silver (Ag) and tin (Sn), alloys composed of silver (Ag) and copper (Cu), and germanium (Ge) and silicon An alloy composed of (Si) is mentioned.
- These alloys may form the protective film 3 alone, or two or more alloys may be used in combination to form the protective film 3.
- the protective film 3 is configured in such a range that it is less susceptible to chlorination by dry etching using a Cl-based gas and the effect of reducing or eliminating the protective film 3 by wet cleaning is exerted.
- the alloy which is a solid solution having a total percentage, may contain elements such as oxygen, nitrogen, hydrogen, and carbon.
- the entire surface of the protective film 3 is completely exposed to the extent that it is less susceptible to chlorination by dry etching using a Cl-based gas and the effect of reducing or eliminating the protective film 3 by wet cleaning is exerted.
- An oxide, nitride, hydride, carbide, oxynitride, oxycarbide, oxynitride carbide, or the like of an alloy that is a solid solution may be formed.
- the protective film 3 Since the protective film 3 remains as a constituent layer in the reflective mask for EUV lithography, the absorption of EUV light is low (the reflectance of the multilayer reflective film 2 is usually 63% or more (normally 73% when the protective film 3 is formed). Less than%)).
- the protective film is composed of an alloy composed of ruthenium (Ru) and cobalt (Co), an alloy composed of ruthenium (Ru) and rhenium (Re), and composed of nickel (Ni) and copper (Cu). More preferably, it is an alloy or an alloy composed of germanium (Ge) and silicon (Si), an alloy composed of ruthenium (Ru) and cobalt (Co), or an alloy composed of ruthenium (Ru) and rhenium (Re). It is particularly preferred.
- an alloy comprising ruthenium (Ru) and cobalt (Co) or In the alloy composed of ruthenium (Ru) and rhenium (Re), the content of Ru in the alloy is preferably 75 atomic% or more and 99.5 atomic% or less, and 90 atomic% or more and 99.5% or less. More preferably, it is 95 atomic% or more and 99.5 atomic% or less.
- This atomic composition can be measured by Auger electron spectroscopy.
- the present invention uses an alloy containing at least two kinds of metals as the protective film 3 and is an all solid solution.
- a method for forming the protective film 3 made of the alloy a conventionally known method is used.
- a method similar to the method for forming the protective film can be employed without any particular limitation. Examples of such a forming method include a magnetron sputtering method and an ion beam sputtering method.
- the content of each constituent metal in the alloy can be adjusted to a desired value.
- the thickness of the protective film 3 is not particularly limited, but is appropriately set so as not to significantly affect the reflectance of the multilayer reflective film 2 and to protect the multilayer reflective film 2 from dry etching and subsequent wet cleaning.
- the range is 1 to 5 nm.
- the thickness of the protective film 3 can be adjusted by the amount of sputtering in a sputtering method or the like.
- a back conductive film may be formed on the main surface of the substrate 1 opposite to the side on which the multilayer reflective film 2 is formed.
- the back surface conductive film is an electrostatic chuck used as a support means for the substrate 10 with a multilayer reflective film in the production of a mask blank, or a mask during pattern processing or exposure of a reflective mask blank for EUV lithography according to the present invention described later. It is formed for the purpose of adsorbing a substrate or mask blank with a multilayer reflective film to an electrostatic chuck used as a support means for handling, or for the purpose of correcting the stress of the multilayer reflective film 2.
- a base film may be formed between the substrate 1 and the multilayer reflective film 2.
- the base film is formed for the purpose of improving the smoothness of the surface of the substrate 1, for the purpose of reducing defects, for the purpose of enhancing the light reflection of the multilayer reflective film 2, and for the purpose of correcting the stress of the multilayer reflective film 2.
- a reference mark serving as a reference for a defect existing position of the substrate 1 or the substrate 10 with a multilayer reflective film is formed on the multilayer reflective film 2 or the protective film 3 by photolithography.
- a mode in which a resist film is formed on the multilayer reflective film 2 or the protective film 3 is also included.
- FIG. 2 is a schematic diagram of a reflective mask blank 12 for EUV lithography according to the present invention.
- the mask blank 12 of the present invention is obtained by forming the absorber film 4 that absorbs EUV light on the protective film 3 of the substrate 10 with the multilayer reflective film of the present invention described above.
- a predetermined absorber film pattern is obtained, and a portion that reflects light (EUV light in the present invention) (a portion where the protective film 3 and the multilayer reflective film 2 below it are exposed)
- a reflective mask for EUV lithography having a light absorbing portion (absorber film pattern) is obtained.
- a back conductive film may be formed on the surface of the substrate 1 opposite to the surface in contact with the multilayer reflective film 2 for the purpose of electrostatic chuck as described above.
- the electrical characteristics required for the back conductive film are usually 100 ⁇ / ⁇ or less.
- a method for forming the back conductive film is known, and can be formed by using a target of metal or alloy such as chromium (Cr) or tantalum (Ta), for example, by magnetron sputtering or ion beam sputtering.
- the thickness of the back conductive film is not particularly limited as long as the above object is achieved, but it is usually 10 to 200 nm.
- the constituent material of the absorber film 4 is not particularly limited as long as it has a function of absorbing the EUV light and can be removed by etching or the like (preferably, it can be etched by dry etching of chlorine (Cl) gas).
- a tantalum (Ta) simple substance or a tantalum compound containing Ta as a main component can be preferably used.
- the tantalum compound is usually a Ta alloy.
- the crystalline state of the absorber film 4 is preferably an amorphous or microcrystalline structure from the viewpoint of smoothness and flatness. If the surface of the absorber film 4 is not smooth and flat, the edge roughness of the absorber film pattern increases, and the dimensional accuracy of the pattern may deteriorate.
- the surface roughness of the absorber film 4 is preferably 0.5 nmRms or less, more preferably 0.4 nmRms or less and 0.3 nmRms or less.
- a compound containing Ta and B a compound containing Ta and N, a compound containing Ta and B and further containing at least one of O and N, a compound containing Ta and Si, Ta A compound containing Si and N, a compound containing Ta and Ge, a compound containing Ta, Ge and N, and the like can be used.
- Ta is a material that has a large EUV light absorption coefficient and can be easily dry-etched with a chlorine-based gas, it is an absorber film material that is excellent in light absorption and workability. Furthermore, by adding B, Si, Ge or the like to Ta, an amorphous material can be easily obtained, and the smoothness of the absorber film 4 can be improved. Further, when N or O is added to Ta, the resistance of the absorber film 4 to oxidation is improved, so that it is possible to improve the stability over time.
- the absorber film material can be microcrystallized by adjusting the substrate heating temperature during the formation of the absorber film 4 and the sputtering gas pressure during the film formation.
- the absorber film 4 described above has a thickness of the absorber film 4 small when the absorption coefficient is 0.025 or more, further 0.030 or more (usually 0.080 or less) with respect to the wavelength of the exposure light. It is preferable in that it can be performed.
- the thickness of the absorber film 4 may be any thickness that can sufficiently absorb EUV light as exposure light, but is usually about 30 to 100 nm.
- the absorber film 4 can be formed by a known method such as a sputtering method such as magnetron sputtering.
- the absorber film 4 can be formed on the protective film 3 by a sputtering method using a target containing tantalum and boron and using an argon gas to which oxygen or nitrogen is added.
- a resist film is formed on the absorber film 4 of the mask blank 12 (FIG. 3A), a desired pattern is drawn (exposure) thereon, and further developed and rinsed to obtain a predetermined resist pattern. 5a is formed.
- this resist pattern 5a As a mask and performing dry etching with a chlorine-based gas, the portion of the absorber film 4 that is not covered with the resist pattern 5a is etched, and the absorber film pattern 4a becomes the protective film 3. It is formed on the top (FIG. 3B).
- the protective film 3 is also dry-etched.
- a specific alloy that is a solid solution is used as a protective film material. Therefore, the protective film 3 is very stable against the etching gas, and there is almost no film loss or disappearance in the subsequent wet cleaning (including wet cleaning in the process of using the reflective mask). Very few. Therefore, the multilayer reflective film 2 under the protective film 3 is not damaged, and an excellent reflectance is achieved and maintained.
- chlorine-based gas chlorine alone gas, mixed gas containing chlorine and oxygen in a predetermined ratio, mixed gas containing chlorine and helium in a predetermined ratio, mixed gas containing chlorine and argon in a predetermined ratio, In addition, a mixed gas containing chlorine and boron trichloride in a predetermined ratio can be given.
- a reflective mask 20 for EUV lithography that achieves the above is obtained (FIG. 3C).
- the obtained reflective mask 20 for EUV lithography is usually subjected to pattern inspection and correction.
- the above-described wet cleaning is usually performed even after pattern inspection and correction.
- the wet cleaning method is appropriately selected depending on the object to be removed. Examples of wet cleaning include acid / alkaline cleaning using sulfuric acid / water (SPM) and ammonia water (APM), functional water cleaning using ozone water, ammonia-added hydrogen water, scrub cleaning and MHz order Examples include megasonic cleaning using ultrasonic waves.
- a transfer pattern based on the absorber film pattern of the mask is formed on a transfer target such as a semiconductor substrate, and various other processes are performed on the semiconductor substrate.
- a semiconductor device in which the pattern or the like is formed can be manufactured.
- the pattern transfer apparatus 50 equipped with the reflective mask 20 is roughly composed of a laser plasma X-ray source 31, a reflective mask 20, a reduction optical system 32, and the like.
- the reduction optical system 32 an X-ray reflection mirror is used.
- the pattern reflected by the reflective mask 20 is usually reduced to about 1 ⁇ 4 by the reduction optical system 32.
- a wavelength band of 13 to 14 nm is used as the exposure wavelength, and the optical path is preset so as to be a vacuum.
- EUV light obtained from the laser plasma X-ray source 31 is incident on the reflective mask 20, and the light reflected here is transferred onto the semiconductor substrate 33 with resist through the reduction optical system 32.
- the light incident on the reflective mask 20 is absorbed and not reflected by the absorber film at a portion where the absorber film pattern 4a is present, while the light incident on the portion where the absorber film pattern 4a is not present is reflected by the multilayer reflective film 2. It is reflected by. In this way, an image formed by the light reflected from the reflective mask 20 enters the reduction optical system 32.
- the exposure light passing through the reduction optical system 32 forms a transfer pattern on the resist layer on the semiconductor substrate 33 with resist.
- the resist pattern can be formed on the semiconductor substrate 33 with resist by developing the exposed resist layer.
- a predetermined wiring pattern can be formed on the semiconductor substrate.
- a semiconductor device is manufactured through such a process and other necessary processes.
- Protective film formation conditions Ru target, sputtering in Ar gas atmosphere, film thickness 14 nm.
- Example sample 1 In the same manner as in Comparative Sample 1, a RuCo (Ru: 97 atomic%, Co: 3 atomic%) protective film was formed on the main surface of the substrate.
- the protective film formation conditions are the same as those of Comparative Example Sample 1 except that a Ru97Co3 target (the numerical value is an atomic% ratio) is used. Note that the composition of each element constituting the protective film is a value measured by Auger electron spectroscopy. The same applies to Example Samples 2 to 5 and Comparative Sample 2.
- Example sample 2 In the same manner as in Comparative Example Sample 1, a RuCo (Ru: 90 atomic%, Co: 10 atomic%) protective film was formed on the main surface of the substrate.
- the protective film formation conditions are the same as those of Comparative Example Sample 1 except that a Ru90Co10 target (the numerical value is an atomic percentage) is used.
- Example sample 3 A RuCo (Ru: 75 atomic%, Co: 25 atomic%) protective film was formed on the main surface of the substrate in the same manner as in Comparative Example Sample 1.
- the protective film formation conditions are the same as those of Comparative Example Sample 1 except that a Ru75Co25 target (the numerical value is an atomic percentage) is used.
- Example Sample 4 A RuCo (Ru: 50 atomic%, Co: 50 atomic%) protective film was formed on the main surface of the substrate in the same manner as in Comparative Example Sample 1.
- the protective film formation conditions are the same as those of Comparative Example Sample 1 except that a Ru50Co50 target (the numerical value is an atomic percentage) is used.
- Example Sample 5 In the same manner as Comparative Example Sample 1, a RuRe (Ru: 97 atomic%, Re: 3 atomic%) protective film was formed on the main surface of the substrate.
- the protective film formation conditions are the same as those of Comparative Example Sample 1 except that a Ru97Re3 target (the numerical value is an atomic percentage) is used.
- Comparative sample 2 In the same manner as in Comparative Example Sample 1, a RuZr (Ru: 80 atomic%, Zr: 20 atomic%) protective film (RuZr is not a total solid solution) was formed on the main surface of the substrate.
- the protective film formation conditions are the same as those of Comparative Example Sample 1 except that a Ru80Zr20 target (the numerical value is an atomic percentage) is used.
- the film thickness of the protective film after the wet cleaning was measured by XRR, the change in film thickness due to the wet cleaning was measured, and the protective film cleaning resistance of each sample was evaluated.
- Example Sample 1 ( ⁇ 1.0 nm), Example Sample 2 (-2.3 nm), Example sample 3 (-2.9 nm), Example sample 4 (-3.2 nm), and Example sample 5 (-1.8 nm).
- Example Sample 2 ( ⁇ 1.0 nm)
- Example Sample 2 (-2.3 nm)
- Example sample 3 (-2.9 nm)
- Example sample 4 (-3.2 nm)
- Example sample 5 (-1.8 nm).
- Example 1 Production of substrate with multilayer reflective film Using a polishing liquid containing colloidal silica abrasive grains on both main surfaces of a TiO 2 -SiO 2 glass (low thermal expansion glass) substrate having a size of 152 mm x 152 mm Then, the substrate was precisely polished and washed to obtain a substrate having a flatness of 0.05 ⁇ m and a surface roughness Rms (root mean square roughness) of 0.12 nm. A multilayer reflective film was formed on the main surface of this substrate by ion beam sputtering (Mo target, Si target).
- Multilayer reflective film Si (4.2 nm) / Mo (2.8 nm) as one period, 40 periods (Si) film is in contact with the main surface of the substrate: total film thickness 280 nm
- Example Sample 1 On the formed multilayer reflective film, the RuCo protective film (Ru: 97 atomic%, Co: 3 atomic%) of Example Sample 1 was formed by the magnetron sputtering method to obtain a substrate with the multilayer reflective film.
- the protective film had a thickness of 2.5 nm.
- the reflectance of EUV light (wavelength: 13.5 nm) was measured for this substrate with a multilayer reflective film using an EUV reflectance measuring apparatus, the reflectance was as high as 66%.
- Example 2 A substrate with a multilayer reflective film was formed in the same manner as in Example 1 except that the protective film was RuCo (Ru: 90 atomic%, Co: 10 atomic%) and the film thickness was 2.5 nm. The reflectance of the EUV light was 65%.
- Example 3 A substrate with a multilayer reflective film was formed in the same manner as in Example 1 except that the protective film was RuCo (Ru: 75 atomic%, Co: 25 atomic%) and the film thickness was 2.5 nm. The reflectance of the EUV light was 64%.
- Example 4 A substrate with a multilayer reflective film was formed in the same manner as in Example 1 except that the protective film was RuRe (Ru: 97 atomic%, Re: 3 atomic%) and the film thickness was 2.5 nm. The reflectance of the EUV light was 65%.
- TaBN film an absorber film
- Example 6 Fabrication of a reflective mask A resist film was applied on the absorber film of the reflective mask blank obtained in Example 5 by spin coating, heated and cooled to form a resist film (film thickness 120 nm). did.
- a predetermined pattern was drawn and developed on the resist film to form a resist pattern.
- the absorber film which is a TaBN film
- any of the reflective masks prepared from the substrates with multilayer reflective films of Examples 1 to 4 disappearance of the protective film was not confirmed, and all the EUV light reflectances were maintained at a high reflectance of 64% or more. The same result was obtained for the reflectance even after the wet cleaning was repeated three times. Therefore, when the lithography process using the pattern transfer apparatus is performed using the reflective masks of Examples 1 to 4, the EUV light is reflected on each film surface and the protective film surface constituting the multilayer reflective film; Since a high contrast can be maintained with the absorption of EUV light in the absorber film pattern, for example, a semiconductor device having a desired circuit pattern can be manufactured.
- Example 6 In Example 6, when the reflective masks were prepared using the comparative samples 1 and 2 as the protective film, all of the protective film disappeared in the mask, and the reflectance of the EUV light of the mask was also changed to the multilayer reflective film. It was reduced to 60% due to damage.
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Abstract
Description
該多層反射膜付き基板は、基板と、該基板上に形成された、EUV光を反射する多層反射膜と、該多層反射膜上に形成された、該多層反射膜を保護する保護膜とを有し、
該保護膜は、少なくとも2種の金属を含む合金からなり、該合金は全率固溶体であることを特徴とする多層反射膜付き基板を提供する。
<基板>
図1は、本発明の多層反射膜付き基板を示す模式図である。本発明の多層反射膜付き基板10に使用される基板1としては、露光時の熱による吸収体膜パターンの歪みを防止するため、低熱膨張係数(0±1.0×10-7/℃の範囲内、より好ましくは0±0.3×10-7/℃の範囲内)を有し、平滑性及び平坦性並びに酸性やアルカリ性の水溶液に対する耐性に優れたものが好ましい。そのような基板1として、低熱膨張性のガラス、例えばTiO2-SiO2系ガラス等が用いられる。その他には、β石英固溶体を析出した結晶化ガラスや、石英ガラス、シリコンや金属基板を用いることもできる。前記金属基板の例としては、インバー合金(Fe-Ni系合金)などが挙げられる。
本発明の多層反射膜付き基板10においては、以上説明した基板1の上に多層反射膜2が形成されている。この膜2は、EUVリソグラフィー用反射型マスクにおいてEUV光を反射する機能を付与するものであり、屈折率の異なる元素が周期的に積層された多層膜の構成を取っている。
上記で形成された多層反射膜2の上に、EUVリソグラフィー用反射型マスクの製造工程におけるドライエッチングやウェット洗浄からの多層反射膜2の保護のため、保護膜3を形成することで、多層反射膜付き基板10として完成する。
図2は、本発明のEUVリソグラフィー用反射型マスクブランク12の模式図である。上述の本発明の多層反射膜付き基板10の保護膜3上にEUV光を吸収する吸収体膜4を形成することによって、本発明のマスクブランク12が得られる。
以上説明した本発明のEUVリソグラフィー用反射型マスクブランクを使用して、EUVリソグラフィー用反射型マスクを製造することができる。その製造方法の模式図を図3に示す。
以上説明した反射型マスクを使用したリソグラフィー技術により、半導体基板等の被転写体に前記マスクの吸収体膜パターンに基づく転写パターンを形成し、その他種々の工程を経ることで、半導体基板上に種々のパターン等が形成された半導体装置を製造することができる。
このような工程その他の必要な工程を経ることで、半導体装置が製造される。
(比較例試料1)
大きさが152mm×152mmのTiO2-SiO2ガラス(低熱膨張ガラス)基板の両主表面を、コロイダルシリカの研磨砥粒を含む研磨液を使用して精密研磨・洗浄し、平坦度0.05μm、表面粗さRms(二乗平均平方根粗さ)0.12nmの基板を得た。この基板の主表面上に、マグネトロンスパッタリング法によりRu保護膜を形成した。
比較例試料1と同様にしてRuCo(Ru:97原子%、Co:3原子%)保護膜を基板の主表面上に形成した。Ru97Co3ターゲット(数値は原子%割合)を使用した以外は、保護膜形成条件は比較例試料1と同じである。なお、保護膜を構成する各元素の組成は、オージェ電子分光分析法により測定された値である。以下、実施例試料2~5、比較例試料2も同様である。
比較例試料1と同様にしてRuCo(Ru:90原子%、Co:10原子%)保護膜を基板の主表面上に形成した。Ru90Co10ターゲット(数値は原子%割合)を使用した以外は、保護膜形成条件は比較例試料1と同じである。
比較例試料1と同様にしてRuCo(Ru:75原子%、Co:25原子%)保護膜を基板の主表面上に形成した。Ru75Co25ターゲット(数値は原子%割合)を使用した以外は、保護膜形成条件は比較例試料1と同じである。
比較例試料1と同様にしてRuCo(Ru:50原子%、Co:50原子%)保護膜を基板の主表面上に形成した。Ru50Co50ターゲット(数値は原子%割合)を使用した以外は、保護膜形成条件は比較例試料1と同じである。
比較例試料1と同様にしてRuRe(Ru:97原子%、Re:3原子%)保護膜を基板の主表面上に形成した。Ru97Re3ターゲット(数値は原子%割合)を使用した以外は、保護膜形成条件は比較例試料1と同じである。
比較例試料1と同様にしてRuZr(Ru:80原子%、Zr:20原子%)保護膜(RuZrは全率固溶体でない)を基板の主表面上に形成した。Ru80Zr20ターゲット(数値は原子%割合)を使用した以外は、保護膜形成条件は比較例試料1と同じである。
上記比較例試料1~2、実施例試料1~5の保護膜表面に対して、Cl2ガスによる全面スパッタエッチングを行った。全面スパッタエッチング条件は、ガス圧力:4mTorr、処理時間15秒とした。
尚、硫酸過水の洗浄条件は、硫酸(98質量%)と過酸化水素(30質量%)を混合比率4:1とした硫酸過水を使用し、温度90℃、時間20分とした。また、アンモニア過水の洗浄条件は、アンモニア(29質量%)と過酸化水素(30質量%)と水を混合比率1:1:5としたアンモニア過水を使用し、温度70℃、時間20分とした。
比較例試料1及び2について、塩素ガスで全面スパッタエッチングした保護膜表面に塩化物生成層による膜厚増加を確認し、ウェット洗浄により、比較例試料1についてはRu保護膜が全部消失し(膜厚変化-14nm)、比較例試料2については膜厚変化は-6.0nmであった。
大きさが152mm×152mmのTiO2-SiO2ガラス(低熱膨張ガラス)基板の両主表面を、コロイダルシリカの研磨砥粒を含む研磨液を使用して精密研磨・洗浄し、平坦度0.05μm、表面粗さRms(二乗平均平方根粗さ)0.12nmの基板を得た。この基板の主表面上に、イオンビームスパッタリング法(Moターゲット、Siターゲット)により多層反射膜を形成した。
保護膜をRuCo(Ru:90原子%、Co:10原子%)、膜厚2.5nmとした以外は、実施例1と同様にして多層反射膜付き基板を形成した。そのEUV光の反射率は65%であった。
保護膜をRuCo(Ru:75原子%、Co:25原子%)、膜厚2.5nmとした以外は、実施例1と同様にして多層反射膜付き基板を形成した。そのEUV光の反射率は64%であった。
保護膜をRuRe(Ru:97原子%、Re:3原子%)、膜厚2.5nmとした以外は、実施例1と同様にして多層反射膜付き基板を形成した。そのEUV光の反射率は65%であった。
実施例1~4で作製された多層反射膜付き基板の、多層反射膜が形成された側と反対側の基板主表面上に、裏面導電膜をマグネトロンスパッタリング法により形成した。
裏面導電膜形成条件:Crターゲット、Ar+N2ガス雰囲気(Ar:N2=90%:10%)、膜組成(Cr:90原子%、N:10原子%)、膜厚20nm。
TaBN膜形成条件:TaBターゲット(Ta:B=80:20)、Xe+N2雰囲気(Xe:N2=90%:10%)、膜組成(Ta:80原子%、B:10原子%、N:10原子%)、膜厚65nm
実施例5で得られた反射型マスクブランクの吸収体膜上に、スピンコート法によりレジストを塗布、加熱・冷却してレジスト膜(膜厚120nm)を形成した。
従って、この実施例1~4の反射型マスクを使用して、パターン転写装置を使用したリソグラフィープロセスを行った場合、多層反射膜を構成する各膜表面および保護膜表面におけるEUV光の反射と、吸収体膜パターンにおけるEUV光の吸収との間で高いコントラストを維持できるので、例えば所望の回路パターンを有する半導体装置を作製することができる。
実施例6において、保護膜として比較例試料1及び2を用いてそれぞれ反射型マスクを作製したところ、マスクにおいて保護膜はすべて消失しており、マスクのEUV光の反射率も、多層反射膜へのダメージにより、60%に低下していた。
2 多層反射膜
3 保護膜
4 吸収体膜
4a 吸収体膜パターン
5a レジストパターン
10 多層反射膜付き基板
12 EUVリソグラフィー用反射型マスクブランク
20 反射型マスク
31 レーザープラズマX線源
32 縮小光学系
33 レジスト付き半導体基板
50 パターン転写装置
Claims (10)
- EUVリソグラフィー用反射型マスクブランクの製造に使用される多層反射膜付き基板であって、
該多層反射膜付き基板は、基板と、該基板上に形成された、EUV光を反射する多層反射膜と、該多層反射膜上に形成された、該多層反射膜を保護する保護膜とを有し、
該保護膜は、少なくとも2種の金属を含む合金からなり、該合金は全率固溶体であることを特徴とする多層反射膜付き基板。 - 前記合金は、
ルテニウム(Ru)とコバルト(Co)とからなる合金、ルテニウム(Ru)とレニウム(Re)とからなる合金、ニッケル(Ni)と銅(Cu)とからなる合金、金(Au)と銀(Ag)とからなる合金、銀(Ag)とスズ(Sn)とからなる合金、銀(Ag)と銅(Cu)とからなる合金又はゲルマニウム(Ge)とシリコン(Si)とからなる合金であることを特徴とする請求項1に記載の多層反射膜付き基板。 - 前記合金は、
ルテニウム(Ru)とコバルト(Co)とからなる合金、ルテニウム(Ru)とレニウム(Re)とからなる合金、ニッケル(Ni)と銅(Cu)とからなる合金又はゲルマニウム(Ge)とシリコン(Si)とからなる合金であることを特徴とする請求項1又は2に記載の多層反射膜付き基板。 - 前記ルテニウム(Ru)とコバルト(Co)とからなる合金及びルテニウム(Ru)とレニウム(Re)とからなる合金において、ルテニウム(Ru)の前記合金中の含有量が、75原子%以上99.5原子%以下であることを特徴とする請求項2又は3に記載の多層反射膜付き基板。
- 前記合金は、
ルテニウム(Ru)とコバルト(Co)とからなる合金又はルテニウム(Ru)とレニウム(Re)とからなる合金であることを特徴とする請求項1乃至4の何れか一項に記載の多層反射膜付き基板。 - 請求項1乃至5の何れか一項に記載の多層反射膜付き基板と、当該基板における保護膜上に形成された、EUV光を吸収する吸収体膜とを有することを特徴とするEUVリソグラフィー用反射型マスクブランク。
- 前記吸収体膜は、塩素(Cl)系ガスのドライエッチングでエッチング可能な材料からなることを特徴とする請求項6に記載のEUVリソグラフィー用反射型マスクブランク。
- 前記吸収体膜は、タンタル(Ta)を含むタンタル化合物からなることを特徴とする請求項6又は7に記載のEUVリソグラフィー用反射型マスクブランク。
- 請求項6乃至8の何れか一項に記載のEUVリソグラフィー用反射型マスクブランクの前記吸収体膜を、塩素(Cl)系ガスによるドライエッチングでエッチングして、前記保護膜上に吸収体膜パターンを形成することを特徴とするEUVリソグラフィー用反射型マスクの製造方法。
- 請求項9に記載のEUVリソグラフィー用反射型マスクの製造方法により得られたEUVリソグラフィー用反射型マスクを使用して、被転写体に転写パターンを形成する工程を有することを特徴とする半導体装置の製造方法。
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KR1020147019934A KR102124176B1 (ko) | 2012-03-23 | 2013-03-21 | 다층 반사막 부착 기판, euv 리소그래피용 반사형 마스크 블랭크, euv 리소그래피용 반사형 마스크의 제조 방법 및 반도체 장치의 제조 방법 |
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