WO2014104276A1 - マスクブランク用基板、多層反射膜付き基板、反射型マスクブランク、反射型マスク、マスクブランク用基板の製造方法及び多層反射膜付き基板の製造方法並びに半導体装置の製造方法 - Google Patents
マスクブランク用基板、多層反射膜付き基板、反射型マスクブランク、反射型マスク、マスクブランク用基板の製造方法及び多層反射膜付き基板の製造方法並びに半導体装置の製造方法 Download PDFInfo
- Publication number
- WO2014104276A1 WO2014104276A1 PCT/JP2013/085049 JP2013085049W WO2014104276A1 WO 2014104276 A1 WO2014104276 A1 WO 2014104276A1 JP 2013085049 W JP2013085049 W JP 2013085049W WO 2014104276 A1 WO2014104276 A1 WO 2014104276A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- substrate
- reflective film
- multilayer reflective
- mask blank
- spatial frequency
- Prior art date
Links
- 239000000758 substrate Substances 0.000 title claims abstract description 362
- 238000004519 manufacturing process Methods 0.000 title claims description 60
- 239000004065 semiconductor Substances 0.000 title claims description 16
- 238000012546 transfer Methods 0.000 claims abstract description 49
- 238000001459 lithography Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims description 119
- 230000001681 protective effect Effects 0.000 claims description 63
- 230000003595 spectral effect Effects 0.000 claims description 63
- 238000000034 method Methods 0.000 claims description 58
- 239000000463 material Substances 0.000 claims description 47
- 239000006096 absorbing agent Substances 0.000 claims description 46
- 239000003054 catalyst Substances 0.000 claims description 35
- 239000002245 particle Substances 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 21
- 238000005530 etching Methods 0.000 claims description 17
- 230000009467 reduction Effects 0.000 claims description 14
- 238000001900 extreme ultraviolet lithography Methods 0.000 claims description 13
- 238000001659 ion-beam spectroscopy Methods 0.000 claims description 13
- 238000003754 machining Methods 0.000 claims description 8
- 238000000059 patterning Methods 0.000 claims description 4
- 238000004630 atomic force microscopy Methods 0.000 claims 1
- 230000003197 catalytic effect Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 341
- 238000007689 inspection Methods 0.000 abstract description 225
- 230000035945 sensitivity Effects 0.000 abstract description 15
- 238000001228 spectrum Methods 0.000 abstract description 10
- 239000010408 film Substances 0.000 description 328
- 239000011521 glass Substances 0.000 description 56
- 230000002829 reductive effect Effects 0.000 description 36
- 238000005498 polishing Methods 0.000 description 29
- 239000007788 liquid Substances 0.000 description 25
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 22
- 238000005259 measurement Methods 0.000 description 20
- 239000007864 aqueous solution Substances 0.000 description 18
- 238000010183 spectrum analysis Methods 0.000 description 18
- 230000003746 surface roughness Effects 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 13
- 238000001514 detection method Methods 0.000 description 12
- 239000000843 powder Substances 0.000 description 11
- 238000003672 processing method Methods 0.000 description 11
- 229910052697 platinum Inorganic materials 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 230000000737 periodic effect Effects 0.000 description 9
- 229910052715 tantalum Inorganic materials 0.000 description 9
- 238000011282 treatment Methods 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 239000012530 fluid Substances 0.000 description 8
- 238000011946 reduction process Methods 0.000 description 8
- 239000010409 thin film Substances 0.000 description 8
- 229910004298 SiO 2 Inorganic materials 0.000 description 7
- 229910052796 boron Inorganic materials 0.000 description 7
- 239000008119 colloidal silica Substances 0.000 description 7
- 239000011949 solid catalyst Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- 239000006061 abrasive grain Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 229910052750 molybdenum Inorganic materials 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 229910004535 TaBN Inorganic materials 0.000 description 4
- 229910010413 TiO 2 Inorganic materials 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000001312 dry etching Methods 0.000 description 4
- 229910052736 halogen Inorganic materials 0.000 description 4
- 150000002367 halogens Chemical class 0.000 description 4
- 238000001755 magnetron sputter deposition Methods 0.000 description 4
- 229910052707 ruthenium Inorganic materials 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- -1 TaCON Inorganic materials 0.000 description 3
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 229910000420 cerium oxide Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000010884 ion-beam technique Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000001020 plasma etching Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910003071 TaON Inorganic materials 0.000 description 2
- 229910004200 TaSiN Inorganic materials 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910000039 hydrogen halide Inorganic materials 0.000 description 2
- 239000012433 hydrogen halide Substances 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000011553 magnetic fluid Substances 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000005546 reactive sputtering Methods 0.000 description 2
- 230000007261 regionalization Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005001 rutherford backscattering spectroscopy Methods 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- 125000006414 CCl Chemical group ClC* 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-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
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 229910004162 TaHf Inorganic materials 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000007687 exposure technique Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 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
- G03F1/68—Preparation processes not covered by groups G03F1/20 - G03F1/50
- G03F1/82—Auxiliary processes, e.g. cleaning or inspecting
- G03F1/84—Inspecting
-
- 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
- G03F1/60—Substrates
-
- 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
-
- 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
-
- 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
- G03F1/80—Etching
-
- 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
-
- 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
- G03F7/2004—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 use of a particular light source, e.g. fluorescent lamps or deep UV light
-
- 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
-
- 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
Definitions
- the present invention can suppress the detection of pseudo defects due to the surface roughness of a substrate in a defect inspection using a high-sensitivity defect inspection apparatus, and can easily find a fatal defect such as a foreign object or a scratch.
- a mask blank substrate, a substrate with a multilayer reflective film obtained from the substrate, a reflective mask blank, a reflective mask, a method for producing the mask blank substrate, a method for producing the substrate with a multilayer reflective film, and the reflective mask are used.
- the present invention relates to a method for manufacturing a semiconductor device.
- EUV lithography which is an exposure technique using extreme ultraviolet (hereinafter referred to as “EUV”) light
- 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 reflection mask has been proposed as a transfer mask used in this EUV lithography. In such a reflective mask, a multilayer reflective film that reflects exposure light is formed on a substrate, and an absorber film that absorbs exposure light is formed in a pattern on the multilayer reflective film.
- the reflective mask includes an absorber film pattern formed from a reflective mask blank having a substrate, a multilayer reflective film formed on the substrate, and an absorber film formed on the multilayer reflective film by a photolithography method or the like. It is manufactured by forming.
- problems in the lithography process are becoming prominent.
- One of the problems is related to defect information such as a mask blank substrate used in the lithography process.
- the mask blank substrate is required to have higher smoothness from the viewpoint of improvement in defect quality associated with recent pattern miniaturization and optical characteristics required for a transfer mask.
- Examples of conventional surface processing methods for mask blank substrates include those described in Patent Documents 1 to 3.
- Patent Document 1 mainly discloses SiO 2 using a polishing slurry containing colloidal silica having an average primary particle diameter of 50 nm or less, an acid and water, and adjusted to have a pH in the range of 0.5 to 4.
- a method for polishing a glass substrate is described in which the surface of a glass substrate as a component is polished so that the surface roughness Rms measured with an atomic force microscope is 0.15 nm or less.
- Patent Document 2 describes an abrasive for a synthetic quartz glass substrate containing an inhibitory colloid solution and an acidic amino acid for suppressing the generation of defects detected by a high-sensitivity defect inspection apparatus on the surface of the synthetic quartz glass substrate. ing.
- Patent Document 3 a quartz glass substrate is placed in a hydrogen radical etching apparatus, and hydrogen radicals are allowed to act on the quartz glass substrate so that the surface flatness can be controlled at a sub-nanometer level. A method for controlling flatness is described.
- Patent Document 4 in the method for manufacturing a glass substrate for EUV mask blanks, the uneven shape on the surface of the glass substrate is measured and subjected to local processing according to the processing conditions according to the convexity of the convex portion to flatten the surface of the glass substrate.
- the degree of surface roughness caused by local processing and the removal of surface defects are described by controlling the degree and further performing non-contact polishing such as EEM on the glass substrate surface subjected to local processing. ing.
- the surface of a mask blank substrate is processed by these methods to increase the flatness of the surface.
- Patent Documents 5 and 6 it is described that CARE (catalyst reference etching) is applied to planarize a semiconductor substrate such as SiC, sapphire, or GaN.
- defect Size With rapid pattern miniaturization in lithography using ArF excimer laser and EUV light, transmission type masks (also called optical masks) such as binary masks and phase shift masks, and EUV masks that are reflective masks
- the defect size (Defect Size) of the defect becomes finer year by year, and in order to find such a fine defect, the inspection light source wavelength used in the defect inspection is approaching the light source wavelength of the exposure light.
- the inspection light source wavelength has been shortened, and a high-sensitivity defect inspection apparatus having an inspection wavelength of 193 nm is becoming widespread.
- high-sensitivity defect inspection apparatuses having inspection light source wavelengths of 266 nm, 193 nm, and 13.5 nm have been widely used or proposed.
- the main surface of the substrate used in the conventional transfer mask is subjected to surface processing, for example, by the method described in [Background Art], and the flatness and surface roughness (smoothness) are increased.
- smoothness index surface roughness represented by Rms (root mean square roughness) and Rmax (maximum roughness) is used.
- Rms root mean square roughness
- Rmax maximum roughness
- “Pseudo-defects” as used herein are permissible irregularities on the substrate surface that do not affect pattern transfer, and are erroneously determined as defects when inspected by a high-sensitivity defect inspection apparatus.
- the fatal defects that affect the pattern transfer are buried in the large number of pseudo defects, and the fatal defects cannot be found.
- the number of detected defects exceeds 100,000, for example, in a measurement area of 132 mm ⁇ 132 mm. The presence or absence cannot be inspected. Oversight of fatal defects in defect inspection causes defects in the subsequent mass production process of semiconductor devices, leading to unnecessary labor and economical loss.
- the present invention uses a mask blank substrate capable of reliably detecting a fatal defect because the number of detected defects including pseudo defects is small even in a high-sensitivity defect inspection machine using light of various wavelengths.
- Substrate with a multilayer reflective film, a reflective mask blank and a reflective mask, and a method for manufacturing the mask blank substrate, a method for manufacturing the substrate with a multilayer reflective film, and a semiconductor device using the reflective mask It aims to provide a method.
- the surface form of the mask blank substrate is very fine, and can be grasped by dividing the form into waves of various wavelengths, and can be divided into regions of low spatial frequency, intermediate spatial frequency and high spatial frequency.
- the mask blank substrate especially the EUV mask blank substrate surface, detailed specifications regarding the surface form are determined from the viewpoint of transfer performance, defect inspection performance, and the like.
- LSFR Low spatial frequency roughness
- MSFR Mid spatial frequency roughness
- HSFR High spatial frequency roughness
- the present inventors have found that a defect whose spatial frequency (or spatial wavelength) component has a pseudo defect with respect to the inspection light source wavelength of the high-sensitivity defect inspection apparatus. We found that it was related to the number of detections. Therefore, among the roughness (unevenness) components on the surface of the substrate main surface, the spatial frequency of the roughness component that the high-sensitivity defect inspection apparatus erroneously determines as a pseudo defect is specified, and the spatial frequency (MSFR and HSFR) By managing the amplitude intensity (power spectrum density) in any one of the above, the number of detected defects including pseudo defects in the defect inspection can be suppressed.
- Configuration 1 of the present invention is a mask blank substrate used for lithography, and an area of 0.14 mm ⁇ 0.1 mm on a main surface on the side where a transfer pattern of the mask blank substrate is formed is a white interferometer.
- the intermediate spatial frequency domain (1 ⁇ 10 to an area of 0.14 mm ⁇ 0.1 mm on the main surface of the mask blank substrate at white light interferometer is detected by the pixel number 640 ⁇ 480 - 2 [mu] m -1 or more 1 [mu] m -1 or less) of the power spectral density is the amplitude intensity of the roughness component (PSD) and 4 ⁇ 10 6 nm 4 or less, and the high spatial frequency region detected in the region of 1 [mu] m ⁇ 1 [mu] m (
- the power spectral density of the roughness component of 1 ⁇ m ⁇ 1 or more) to 10 nm 4 or less, inspection light in the wavelength region of 150 nm to 365 nm (for example, UV laser with a wavelength of 266 nm, ArF excimer laser with 193 nm) or 13.5 nm
- the detection of pseudo defects in defect inspection using high-sensitivity defect inspection equipment using EUV light can be suppresse
- the root mean square roughness (Rms) obtained by measuring a 1 ⁇ m ⁇ 1 ⁇ m region of the main surface with an atomic force microscope is less than 0.13 nm. It is a mask blank substrate as described.
- the surface of the multilayer reflective film is the same surface as the surface of the mask blank substrate. Since it becomes rough, the reflectance characteristic of the multilayer reflective film with respect to EUV light can be enhanced.
- the power spectral density in the spatial frequency 1 [mu] m -1 or 10 [mu] m -1 or less obtained by measuring an area of 1 [mu] m ⁇ 1 [mu] m of the main surface by an atomic force microscope is 1 nm 4 or 10 nm 4 or less
- a high-sensitivity defect inspection apparatus having an inspection light source wavelength in a wavelength range of 150 nm to 365 nm (for example, 266 nm and 193 nm) is used. In all defect inspections, the number of detected defects including pseudo defects can be reduced.
- a fourth aspect of the present invention is the mask blank substrate according to any one of the first to third aspects, wherein the substrate is a mask blank substrate used for EUV lithography.
- the surface shape of the multilayer reflective film surface formed on the main surface is also highly smooth.
- the reflectance characteristics are also good, which is suitable for EUV lithography.
- Configuration 5 of the present invention includes a multilayer reflective film in which high refractive index layers and low refractive index layers are alternately stacked on the main surface of the mask blank substrate according to any one of Configurations 1 to 4. It is the board
- the surface form of the surface of the multilayer reflective film formed on the main surface is also highly smooth, the reflectance characteristics with respect to the EUV light are also improved.
- defect detection including pseudo defects in a defect inspection on the surface of the multilayer reflective film using a high-sensitivity defect inspection apparatus that uses light of 266 nm, 193 nm, or 13.5 nm as the inspection light source wavelength. The number can be greatly reduced, and the fatal defects can be made more prominent.
- a sixth aspect of the present invention is the substrate with a multilayer reflective film according to the fifth aspect, wherein a protective film is provided on the multilayer reflective film.
- the protective film is provided on the multilayer reflective film, damage to the multilayer reflective film surface when the transfer mask (EUV mask) is manufactured can be suppressed.
- the reflectance characteristics of the multilayer reflective film are further improved.
- the number of detected defects including pseudo defects in the defect inspection of the protective film surface using a high-sensitivity defect inspection apparatus that uses light of 266 nm, 193 nm, or 13.5 nm as the inspection light source wavelength. Can be significantly reduced, and fatal defects can be made more prominent.
- Configuration 7 of the present invention is a substrate with a multilayer reflective film having a multilayer reflective film in which a high refractive index layer and a low refractive index layer are alternately laminated on a main surface of a mask blank substrate used in lithography.
- Spatial frequency 1 obtained by measuring a 0.14 mm ⁇ 0.1 mm region on the surface of the substrate with the multilayer reflective film on the side where the multilayer reflective film is formed with a white interferometer at a number of pixels of 640 ⁇ 480 ⁇ 10 power spectral density at -2 [mu] m -1 or 1 [mu] m -1 or less is not more 4 ⁇ 10 7 nm 4 below, give an area of 1 [mu] m ⁇ 1 [mu] m in the multilayer reflective film coated substrate surface as measured by atomic force microscope
- the substrate with a multilayer reflective film is characterized in that the power spectral density at a spatial frequency of 1 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇ 1 or less is 20 nm 4 or less.
- a 0.14 mm ⁇ 0.1 mm region on the surface of the substrate with the multilayer reflective film on the side where the multilayer reflective film is formed is detected by the white interferometer with the number of pixels of 640 ⁇ 480.
- PSD power spectral density
- inspection light in the wavelength region of 150 nm to 365 nm for example, UV laser having a wavelength of 266 nm, 193 nm) ArF excimer laser
- 13.5 nm EUV light are used to suppress detection of pseudo defects in defect inspection using a
- high-sensitivity defect inspection apparatus using 13.5 nm EUV light can suppress scattering of the substrate surface with the multilayer reflective film when performing the defect inspection of the substrate surface with the multilayer reflective film. It is possible to obtain a substrate with a multilayer reflective film capable of reliably performing defect inspection under inspection conditions (for example, inspection sensitivity conditions capable of detecting a 15 nm size defect in terms of SEVD).
- Configuration 8 of the present invention is characterized in that a root mean square roughness (Rms) obtained by measuring an area of 1 ⁇ m ⁇ 1 ⁇ m on the surface of the multilayer reflective film-coated substrate with an atomic force microscope is less than 0.13 nm.
- Rms root mean square roughness
- the reflectance characteristic of the multilayer reflective film with respect to EUV light can be enhanced by setting the root mean square roughness to a predetermined value or less.
- Configuration 9 of the present invention is the substrate with a multilayer reflective film according to Configuration 7 or 8, wherein a protective film is provided on the multilayer reflective film.
- the protective film is provided on the multilayer reflective film, damage to the multilayer reflective film surface at the time of manufacturing the transfer mask (EUV mask) can be suppressed.
- the reflectance characteristics of the multilayer reflective film are further improved.
- the number of detected defects including pseudo defects in the defect inspection of the protective film surface using a high-sensitivity defect inspection apparatus that uses light of 266 nm, 193 nm, or 13.5 nm as the inspection light source wavelength. can be significantly reduced, and fatal defects can be made more prominent.
- a high-sensitivity defect inspection condition for example, It is possible to reliably perform defect inspection under inspection sensitivity conditions (which can detect defects having a size of 15 nm in terms of SEVD).
- a reflective mask comprising an absorber film serving as a transfer pattern on the multilayer reflective film or protective film of the multilayer reflective film-coated substrate according to any one of the fifth to ninth aspects. It is blank.
- the number of detected defects including pseudo defects in the defect inspection using the high-sensitivity defect inspection apparatus using light of 266 nm, 193 nm, or 13.5 nm as the inspection light source wavelength is reduced.
- a fatal defect can be revealed.
- Configuration 11 of the present invention is a reflective mask characterized in that an absorber pattern obtained by patterning the absorber film in the reflective mask blank according to Configuration 10 is provided on the multilayer reflective film or the protective film. is there.
- the number of detected defects including pseudo defects in the defect inspection using the high-sensitivity defect inspection apparatus can be reduced, and further, fatal defects can be made obvious.
- Configuration 12 of the present invention is a mask blank substrate having a surface processing step for processing a main surface on a side where a transfer pattern of a mask blank substrate used for lithography is formed so that a predetermined surface form is obtained.
- the surface processing step includes a spatial frequency of 1 ⁇ 10 obtained by measuring a 0.14 mm ⁇ 0.1 mm region on the main surface with a white interferometer at a pixel number of 640 ⁇ 480.
- an area of 0.14 mm ⁇ 0.1 mm on the main surface on the side where the transfer pattern is formed is measured with a white interferometer and the number of pixels is 640.
- Predetermined surface processing so that the PSD in the intermediate spatial frequency region measured at ⁇ 480 is 4 ⁇ 10 6 nm 4 or less and the PSD in the high spatial frequency region detected in the 1 ⁇ m ⁇ 1 ⁇ m region is 10 nm 4 or less.
- inspection light for example, UV laser having a wavelength of 266 nm, ArF excimer laser having a wavelength of 266 nm
- EUV light having a wavelength of 13.5 nm Able to reduce the number of detected defects, including pseudo defects, in defect inspection, and to make fatal defects obvious
- the mask blank substrate of the present invention that can be manufactured can be manufactured.
- high-sensitivity defect inspection apparatus using 13.5 nm EUV light can suppress scattering of the substrate surface with the multilayer reflective film when performing the defect inspection of the substrate surface with the multilayer reflective film.
- a mask blank substrate capable of reliably performing defect inspection under inspection conditions for example, inspection sensitivity conditions capable of detecting a 15 nm size defect in terms of SEVD can be obtained.
- an intermediate spatial frequency domain roughness reducing step of surface processing so that the power spectral density is 4 ⁇ 10 6 nm 4 below in -2 [mu] m -1 or 1 [mu] m -1 or less, an area of 1 [mu] m ⁇ 1 [mu] m in the main surface atoms
- a high spatial frequency domain roughness reduction step of performing surface processing so that a power spectral density at a spatial frequency of 1 ⁇ m ⁇ 1 or more obtained by measuring with an atomic force microscope is 10 nm 4 or less.
- a mask blank substrate that satisfies the PSD conditions is preferably manufactured. can do.
- Configuration 14 of the present invention is the mask blank substrate manufacturing method according to Configuration 13, wherein the high spatial frequency domain roughness reduction step is performed after the intermediate spatial frequency domain roughness reduction step.
- the surface processing step is performed by EEM (Elastic Emission Machining) and / or catalyst-based etching: CARE (CAtalyst-Referred Etching). It is a manufacturing method of the board
- the roughness of the intermediate spatial frequency region and the high spatial frequency region can be effectively reduced by performing the surface processing step by EEM and / or CARE.
- Configuration 16 of the present invention is the mask blank substrate according to Configuration 13 or 14, wherein the intermediate spatial frequency domain roughness reduction step is performed by surface processing the main surface with EEM. It is a manufacturing method.
- the EEM is suitable for reducing the roughness of the intermediate spatial frequency region, it is possible to manufacture a mask blank substrate in which the roughness of the intermediate spatial frequency region is particularly preferably reduced.
- the structure 17 of the present invention is the structure 13 according to any one of the structures 13 to 16, wherein the high spatial frequency domain roughness reducing step is performed by surface-treating the main surface by catalyst-based etching. It is a manufacturing method of a mask blank substrate.
- the catalyst-based etching is suitable for reducing the roughness in the high spatial frequency region, it is possible to manufacture a mask blank substrate in which the roughness in the high spatial frequency region is particularly suitably reduced.
- Configuration 18 of the present invention is the method for manufacturing a mask blank substrate according to any one of Configurations 12 to 17, wherein the substrate is a mask blank substrate used for EUV lithography.
- the surface form of the surface of the multilayer reflective film formed on the main surface is also highly smooth, so that the multilayer reflective film reflects the EUV light.
- the rate characteristic is also good, which is suitable for EUV lithography.
- Configuration 19 a mask blank substrate according to any one of Configurations 1 to 4 or a mask blank substrate manufactured by the manufacturing method according to any one of Configurations 12 to 18 is formed on the main surface.
- a method for producing a substrate with a multilayer reflective film comprising a multilayer reflective film forming step of forming a multilayer reflective film in which a refractive index layer and a low refractive index layer are alternately laminated.
- the reflectance characteristic for EUV light is also improved.
- defect detection including pseudo defects in a defect inspection on the surface of the multilayer reflective film using a high-sensitivity defect inspection apparatus that uses light of 266 nm, 193 nm, or 13.5 nm as the inspection light source wavelength.
- the number can be reduced, and further, fatal defects can be made obvious.
- high-sensitivity defect inspection apparatus using 13.5 nm EUV light can suppress scattering of the substrate surface with the multilayer reflective film when performing the defect inspection of the substrate surface with the multilayer reflective film. It is possible to obtain a substrate with a multilayer reflective film capable of reliably performing defect inspection under inspection conditions (for example, inspection sensitivity conditions capable of detecting a 15 nm size defect in terms of SEVD).
- the structure 20 of the present invention is characterized in that the multilayer reflective film forming step is performed by alternately forming the high refractive index layer and the low refractive index layer by an ion beam sputtering method. It is a manufacturing method of the board
- a multilayer reflective film having excellent smoothness and hence excellent EUV light reflectance characteristics can be obtained by forming an alternating laminate of high refractive index layers and low refractive index layers by ion beam sputtering.
- a substrate with a multilayer reflective film can be efficiently produced.
- the sputtered particles of the high refractive index material and the low refractive index material are formed by ion beam sputtering using a target of a high refractive index material and a low refractive index material.
- the sputtered particles of the high-refractive index material and the low-refractive index material are set to 0 degrees with respect to the normal line of the substrate main surface by ion beam sputtering using the target of the high-refractive index material and the low-refractive index material.
- Configuration 22 of the present invention is the method for manufacturing a substrate with a multilayer reflective film according to any one of Configurations 19 to 21, further comprising a step of forming a protective film on the multilayer reflective film.
- the protective film is formed on the multilayer reflective film, damage to the multilayer reflective film surface when the transfer mask (EUV mask) is manufactured can be suppressed.
- the reflectance characteristics of the multilayer reflective film are further improved.
- the number of detected defects including pseudo defects in the defect inspection of the protective film surface using a high-sensitivity defect inspection apparatus that uses light of 266 nm, 193 nm, or 13.5 nm as the inspection light source wavelength. Can be reduced, and a fatal defect can be revealed.
- a semiconductor device comprising a step of performing a lithography process using an exposure apparatus using the reflective mask according to the eleventh aspect and forming a transfer pattern on a transfer target. It is a manufacturing method.
- a reflective mask that excludes fatal defects such as foreign matters and scratches, and the number of detected defects including pseudo defects in the inspection is greatly increased. As a result, unnecessary costs are reduced. Therefore, a resist film formed on a transfer target such as a semiconductor substrate has no defect in a transfer pattern such as a circuit pattern transferred using the mask, and has a fine and high-precision transfer pattern. The device can be manufactured economically.
- a mask blank substrate capable of reliably detecting a fatal defect because the number of detected defects including pseudo defects is small even in a high-sensitivity defect inspection machine that uses light of various wavelengths.
- a substrate with a multilayer reflective film, a reflective mask blank and a reflective mask, and a method for manufacturing the mask blank substrate, a method for manufacturing the substrate with a multilayer reflective film, and a semiconductor device using the reflective mask A manufacturing method is provided.
- FIG. 1A is a perspective view showing a mask blank substrate 10 according to an embodiment of the present invention.
- FIG.1 (b) is a cross-sectional schematic diagram which shows the mask blank substrate 10 of this embodiment. It is a cross-sectional schematic diagram which shows an example of a structure of the board
- FIG. It is a figure which shows the result of having measured the power spectrum density with the atomic force microscope about the area
- FIG. 1A is a perspective view showing a mask blank substrate 10 of the present embodiment.
- FIG.1 (b) is a cross-sectional schematic diagram which shows the mask blank substrate 10 of this embodiment.
- the mask blank substrate 10 (or simply referred to as the substrate 10) is a rectangular plate-like body, and has two opposing main surfaces 2 and an end surface 1.
- the two opposing main surfaces 2 are the upper surface and the lower surface of this plate-like body, and are formed so as to oppose each other. At least one of the two opposing main surfaces 2 is a main surface on which a transfer pattern is to be formed.
- the end face 1 is a side face of the plate-like body and is adjacent to the outer edge of the opposing main surface 2.
- the end surface 1 has a planar end surface portion 1d and a curved end surface portion 1f.
- the planar end surface portion 1d is a surface that connects the side of one opposing main surface 2 and the side of the other opposing main surface 2, and includes a side surface portion 1a and a chamfered slope portion 1b.
- the side surface portion 1a is a portion (T surface) substantially perpendicular to the opposing main surface 2 in the planar end surface portion 1d.
- the chamfered slope portion 1b is a chamfered portion (C surface) between the side surface portion 1a and the opposing main surface 2, and is formed between the side surface portion 1a and the opposing main surface 2.
- the curved end surface portion 1f is a portion (R portion) adjacent to the vicinity of the corner portion 10a of the substrate 10 when the substrate 10 is viewed in plan, and includes a side surface portion 1c and a chamfered slope portion 1e.
- the plan view of the substrate 10 refers to, for example, viewing the substrate 10 from a direction perpendicular to the opposing main surface 2.
- substrate 10 is the intersection vicinity of two sides in the outer edge of the opposing main surface 2, for example. The intersection of two sides may be the intersection of the extension lines of the two sides.
- the curved end surface portion 1 f is formed in a curved shape by rounding the corner 10 a of the substrate 10.
- the present invention provides at least a main surface on the side where a transfer pattern is formed, that is, a reflective mask blank 30 as will be described later, a multilayer reflective film 21, a protective film 22, an absorber film.
- the main surface on the side where 24 is formed has a specific power spectral density in a specific spatial frequency region (Power Spectrum Density: PSD).
- PSD power spectral density
- ⁇ Power spectral density> By subjecting the surface of the mask blank substrate 10 to Fourier transform of the unevenness of the substrate surface obtained by, for example, measuring with a white interferometer or an atomic force microscope, the unevenness is obtained with an amplitude intensity at a predetermined spatial frequency. Can be represented. This represents the measurement data of the unevenness (that is, the fine form of the substrate surface) as a sum of waves having a predetermined spatial frequency, that is, the surface form of the substrate is divided into waves having a predetermined spatial frequency.
- Nx and Ny are the numbers of data in the x and y directions.
- u 0, 1, 2,... Nx ⁇ 1
- v 0, 1, 2,... Ny ⁇ 1
- the spatial frequency f is given by the following equation (3).
- the power spectral density PSD at this time is given by the following equation (4).
- This power spectrum analysis is excellent in that it can grasp the change in the surface state of the substrate not only as a simple change in height but also as a change in its spatial frequency. This is a technique for analyzing the influence of reaction on the substrate surface.
- the mask blank substrate 10 of the present invention uses a white interferometer to measure the number of pixels in a 0.14 mm ⁇ 0.1 mm region on the main surface on which the transfer pattern is formed.
- spatial frequency 1 ⁇ 10 obtained by measuring at 640 ⁇ 480 -2 ⁇ m -1 or more 1 [mu] m -1 the PSD in the following areas a 4 ⁇ 10 6 nm 4 or less, and 1 [mu] m ⁇ 1 [mu] m area AFM
- the PSD in the region of 1 ⁇ m ⁇ 1 or more obtained by measuring at 10 nm is made 10 nm 4 or less.
- the region of 0.14 mm ⁇ 0.1 mm and the region of 1 ⁇ m ⁇ 1 ⁇ m are the central region of the mask blank substrate 10.
- the center is an intersection of diagonal lines of the rectangle. That is, the intersection and the center in the region (the center of the region is the same as the center of the substrate) coincide.
- an area of 0.14 mm ⁇ 0.1 mm with white light interferometer is to observe in pixels number 640 ⁇ 480
- PSD data in each spatial frequency region referred to above is obtained by observing under the measurement conditions (measurement field of view, etc.) referred to as having high reliability.
- a high-sensitivity defect inspection apparatus that uses wavelengths (for example, 266 nm, 193 nm) selected from a wavelength region of 150 nm to 365 nm as the inspection light source wavelength, and EUV light (for example, light having a wavelength of 13.5 nm) is 1 ⁇ m ⁇ Since the roughness of one or more high spatial frequency regions is likely to be erroneously detected as pseudo defects, the number of detected defects including pseudo defects can be reduced by suppressing the roughness (PSD as amplitude intensity) in these regions to a certain value or less. While reducing, it is possible to reliably detect a fatal defect that must not be detected.
- wavelengths for example, 266 nm, 193 nm
- EUV light for example, light having a wavelength of 13.5 nm
- a high-sensitivity defect inspection apparatus using an inspection light source in the wavelength region of 150 nm to 365 nm (for example, a 266 nm UV laser or a 193 nm ArF excimer laser) is used to detect the main surface of the mask blank substrate 10.
- the PSD in the region of 1 ⁇ m ⁇ 1 to 10 ⁇ m ⁇ 1 obtained by measuring the region of 1 ⁇ m ⁇ 1 ⁇ m with an atomic force microscope is 10 nm 4 or less.
- the PSD having a spatial frequency of 1 ⁇ m ⁇ 1 or more and 10 ⁇ m ⁇ 1 or less is 1 nm 4 or more and 10 nm 4 or less.
- the main surface of the mask blank substrate 10 is 1 ⁇ m ⁇
- the power spectral density of a spatial frequency of 10 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇ 1 or less obtained by measuring an area of 1 ⁇ m with an atomic force microscope is preferably 5 nm 4 or less, more preferably a spatial frequency of 10 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇
- the power spectral density of 1 or less is 0.5 nm 4 or more and 5 nm 4 or less.
- a mask substrate / blank defect inspection apparatus for EUV exposure manufactured by Lasertec Corporation.
- MAGICS M7360 KLA-Tencor reticle
- optical mask / blank optical mask / blank
- UV mask / blank defect inspection system UV mask / blank defect inspection system
- Actinic defect inspection system
- the number of detected defects including pseudo defects can be greatly reduced. This makes it possible to make the fatal defect conspicuous. If a fatal defect is detected, it is removed, or the mask is designed so that the absorber pattern 27 is placed on the fatal defect in a reflective mask 40 described later.
- Various treatments can be applied.
- the inspection light source wavelength is not limited to 266 nm, 193 nm, and 13.5 nm.
- As the inspection light source wavelength 532 nm, 488 nm, 364 nm, and 257 nm may be used.
- the present invention is most effective when performing a defect inspection using an inspection light source wavelength in the region of 150 nm to 365 nm or a high sensitivity defect inspection with an inspection light source wavelength of 13.5 nm.
- Rms ⁇ Surface roughness (Rms)> Rms (Root means square) which is a representative surface roughness index in the mask blank substrate 10 is a root mean square roughness, and is a square root of a value obtained by averaging the squares of deviations from the average line to the measurement curve. is there. That is, Rms is expressed by the following formula (1).
- Rms can be obtained by measuring an area of 1 ⁇ m ⁇ 1 ⁇ m on the main surface of the mask blank substrate 10 with an atomic force microscope.
- the above-mentioned root mean square roughness (Rms) is preferably less than 0.13 nm, more preferably 0.12 nm or less, and still more preferably 0.10 nm or less.
- the preferred surface roughness of the surface of the multilayer reflective film 21 (that is, the substrate surface with the multilayer reflective film) has a root mean square roughness (Rms) of less than 0.13 nm, more preferably 0.12 nm or less, and even more preferably Is 0.10 nm or less.
- the main surface on the side where the transfer pattern is formed is subjected to surface processing so as to have high flatness from the viewpoint of obtaining at least pattern transfer accuracy and position accuracy.
- the flatness is preferably 0.1 ⁇ m or less, particularly preferably 0.05 ⁇ m, in the main surface 142 mm ⁇ 142 mm region on the side where the transfer pattern of the substrate 10 is formed. It is as follows.
- the main surface opposite to the side on which the transfer pattern is formed is a surface to be electrostatically chucked when being set in the exposure apparatus, and in a 142 mm ⁇ 142 mm region, the flatness is 1 ⁇ m or less, particularly preferably. 0.5 ⁇ m or less.
- the mask blank substrate of the present invention described above has a main surface on the side where the transfer pattern is formed, a predetermined surface form, that is, a region of 0.14 mm ⁇ 0.1 mm on the main surface by a white interferometer.
- an area of 1 [mu] m ⁇ 1 [mu] m of the power spectral density becomes 4 ⁇ 10 6 nm 4 or less, and the main surface in a spatial frequency 1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 obtained by measuring in pixels number 640 ⁇ 480 It can be manufactured by surface processing so that the power spectral density at a spatial frequency of 1 ⁇ m ⁇ 1 or more obtained by measurement with an atomic force microscope is 10 nm 4 or less. In addition, it is preferable to also perform the surface processing for achieving the above-mentioned surface roughness (Rms).
- the surface treatment method is known and can be employed without any particular limitation in the present invention.
- MRF magnetic viscoelastic fluid polishing
- CMP chemical mechanical polishing
- GCIB gas cluster ion beam etching
- DCP dry chemical planarization
- CMP uses a small-diameter polishing pad and a polishing agent (containing abrasive grains such as colloidal silica) and controls the residence time of the contact portion between the small-diameter polishing pad and the workpiece (mask blank substrate).
- a polishing agent containing abrasive grains such as colloidal silica
- This is a local processing method for polishing a convex portion of the workpiece surface.
- GCIB generates gas cluster ions by ejecting a gaseous reactive substance (source gas) at room temperature and normal pressure while adiabatic expansion in a vacuum device, and ionizing it by electron irradiation.
- DCP is a local processing method in which dry etching is locally performed by locally performing plasma etching and controlling the amount of plasma etching according to the degree of convexity.
- any material can be used as a material for the reflective mask blank substrate for EUV exposure as long as it has low thermal expansion characteristics.
- SiO 2 —TiO 2 glass having characteristics of low thermal expansion binary system (SiO 2 —TiO 2 ) and ternary system (SiO 2 —TiO 2 —SnO 2 etc.)
- SiO 2 —Al 2 O A so-called multicomponent glass such as a 3- Li 2 O-based crystallized glass can be used.
- a substrate such as silicon or metal can also be used. Examples of the metal substrate include Invar alloy (Fe—Ni alloy).
- a multi-component glass material is used, but synthetic quartz used for a transmission type mask blank substrate.
- synthetic quartz used for a transmission type mask blank substrate.
- a thin film made of a metal, an alloy, or a material containing at least one of oxygen, nitrogen, and carbon in any one of them may be formed on a substrate made of a multicomponent glass material. it can. And the surface of the surface roughness of the said range can be formed comparatively easily by carrying out mirror surface polishing and surface treatment of such a thin film surface.
- Ta tantalum
- an alloy containing Ta or a Ta compound containing at least one of oxygen, nitrogen, and carbon in any of these is preferable.
- the Ta compound for example, TaB, TaN, TaO, TaON, TaCON, TaBN, TaBO, TaBON, TaBCON, TaHf, TaHfO, TaHfN, TaHfON, TaHfCON, TaSi, TaSiO, TaSiN, TaSiON, TaSiCON, etc. may be used. it can.
- the thin film preferably has an amorphous structure from the viewpoint of high smoothness on the surface of the thin film.
- the crystal structure of the thin film can be measured by an X-ray diffractometer (XRD).
- the method for manufacturing a mask blank substrate of the present invention includes a surface processing step of performing surface processing so as to obtain a surface form having a predetermined PSD in the predetermined spatial frequency region.
- the surface treatment process is achieving predetermined PSD in the intermediate space frequency domain (spatial frequency 1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 or less in area) and a high spatial frequency range (spatial frequency 1 [mu] m -1 or more regions)
- the implementation method of the process is not particularly limited as long as it can be performed, but the intermediate spatial frequency domain roughness reduction process for reducing the PSD in the intermediate spatial frequency domain to the above range, and the PSD in the high spatial frequency domain are described above. It is preferable to carry out by carrying out a high spatial frequency domain roughness reduction step to make the range.
- the high spatial frequency domain roughness reduction process generally requires finer roughness adjustment, and the high spatial frequency domain roughness is also affected by the work of the intermediate spatial frequency domain roughness reduction process.
- These steps are preferably performed by any surface processing method of EEM (Elastic Emission Machining) or catalyst-based etching (CARE (Catalyst-Referred Etching)).
- EEM Elastic Emission Machining
- CARE Catalyst-Referred Etching
- EEM is useful in the intermediate spatial frequency domain roughness reduction process
- CARE is useful in the high spatial frequency domain roughness reduction process.
- EEM brings fine powder particles of 0.1 ⁇ m or less into contact with the work piece (mask blank substrate) under almost no load condition, and at that time, an interaction that occurs at the interface between the fine powder particles and the work piece (a kind)
- a workpiece In order to make contact in the unloaded state, for example, a workpiece is placed in water, fine powder particles are dispersed in the water, and a rotating body such as a wheel is provided in the vicinity of the workpiece surface of the workpiece. It is arranged and rotated. By this rotational motion, a flow called a high-speed shear flow is generated between the workpiece surface and the rotating body, and fine powder particles act on the workpiece surface.
- the size of the rotating body is appropriately selected according to the size of the workpiece.
- the shape of the rotating body is appropriately selected according to the region on the surface of the workpiece to be preferentially contacted (reacted) with the processing liquid. When it is desired to contact the machining liquid locally, the shape is spherical or linear. When it is desired to contact the machining liquid preferentially in a relatively wide area, the shape is cylindrical.
- the material of the rotating body should be resistant to the machining fluid and have a low elasticity as much as possible.
- High elasticity (relatively soft) is not preferable because it may cause shape deformation during rotation or the shape may become unstable, which may deteriorate the processing accuracy.
- polyurethane, glass, ceramics, or the like can be used as the material of the rotating body.
- the rotational speed of the rotating body is appropriately selected depending on the PSD to be achieved, but is usually 50 to 1000 rpm, and the polishing time by the rotating body is usually 60 to 300 minutes.
- a workpiece is arranged perpendicularly to a rotating body, and a predetermined load is applied to the rotated rotating body, thereby adjusting a gap between the workpiece and the rotating body. it can.
- the rotating body is scanned in parallel with the rotation axis.
- it is moved by a certain distance parallel to the rotating body and scanned in the reverse direction. By repeating these operations, the entire area can be processed.
- the load range is appropriately selected depending on the PSD to be achieved, but is usually set in the range of 0.5 kg to 5 kg.
- Examples of the fine powder particles used in EEM include cerium oxide, silica (SiO 2 ), colloidal silica, zirconium oxide, manganese dioxide, aluminum oxide, and the like.
- the workpiece is a glass substrate
- the fine powder particles it is preferable to use zirconium oxide, aluminum oxide, colloidal silica or the like.
- the average particle size of the fine powder particles is preferably 100 nm or less (note that the average particle size is measured from an image 15 to 105 ⁇ 10 3 times using an SEM (scanning electron microscope). can get).
- fine powder particles may be suspended in a solvent in which the workpiece is disposed to form a processing liquid, which may be brought into contact with the workpiece.
- any one of water, an acidic aqueous solution, and an alkaline aqueous solution in which fine powder particles are dispersed may be used as the processing liquid, or any one of the aqueous solutions may be used as the processing liquid.
- the acidic aqueous solution examples include aqueous solutions of sulfuric acid, hydrochloric acid, hydrofluoric acid, silicic acid, and the like.
- the polishing rate is improved.
- the glass substrate may be roughened, so an acid and a concentration that do not rough the glass substrate are selected as appropriate.
- the alkaline aqueous solution examples include aqueous solutions of potassium hydroxide, sodium hydroxide and the like.
- aqueous solutions of potassium hydroxide, sodium hydroxide and the like When an alkaline aqueous solution is included in the processing liquid in non-contact polishing, the polishing rate is improved.
- the alkaline aqueous solution is adjusted within a range in which the abrasive grains contained in the processing liquid do not dissolve, and is preferably adjusted so that the pH of the processing liquid is 9 to 12.
- the processing principle of CARE is that the workpiece (mask blank substrate) and the catalyst are arranged in the treatment liquid, or the treatment liquid is supplied between the workpiece and the catalyst, and the workpiece and the catalyst are separated.
- the workpiece is processed by the active species generated from the molecules in the treatment liquid that are brought into contact with each other and adsorbed on the catalyst at that time.
- the processing principle is that the treatment liquid is water, the workpiece and the catalyst are contacted in the presence of water, and the catalyst and the workpiece surface The product of hydrolysis is removed from the surface of the workpiece and processed by, for example, relative movement.
- the CARE processing method includes arranging a workpiece in a processing solution that does not normally exhibit solubility with respect to the workpiece, a metal such as platinum, gold, iron, and molybdenum, an alloy such as SUS, or the like.
- a processing reference surface made of a ceramic-based solid catalyst is placed in contact with or in close proximity to the processing surface of the workpiece (or a processing liquid is supplied between the processing object and the catalyst), and the processing is performed in the processing liquid.
- the workpiece is machined by causing the workpiece to react with the active species generated on the surface of the machining reference surface by relatively moving the workpiece and the machining reference surface.
- a treatment solution in which molecules containing halogen are dissolved may be used.
- hydrogen halide is preferable as the molecule containing halogen, but molecules having bonds such as C—F, SF, NF, C—Cl, S—Cl, N—Cl can also be used. It is.
- hydrohalic acid an aqueous solution in which hydrogen halide molecules are dissolved
- the halogen include fluorine (F), chlorine (Cl), bromine (Br), and iodine (I), but the chemical reactivity decreases as the atomic number increases.
- hydrofluoric acid HF aqueous solution
- glass SiO 2
- Ti contained in the low expansion glass is selectively eluted in the HCl aqueous solution. In consideration of these factors and processing time, it is preferable to use hydrohalic acid adjusted to an appropriate concentration.
- a metal such as platinum, gold, iron, molybdenum, an alloy such as SUS, or a ceramic solid catalyst that oxidizes hydrogen and promotes a reaction of extracting hydrogen ions and atoms is used.
- Active species are generated only on the processing reference surface, and this active species is deactivated immediately after leaving the processing reference surface, so there is almost no side reaction, and the principle of surface processing is chemical reaction instead of mechanical polishing. Therefore, damage to the workpiece is extremely small, excellent smoothness can be achieved, and roughness in the high spatial frequency region can be effectively reduced.
- the mask blank substrate is a glass substrate
- transition metals such as platinum, gold, silver, copper, molybdenum, nickel, and chromium as the solid catalyst
- the present inventors consider that this may proceed), and by performing CARE in water, substrate surface processing can be performed, and CARE is performed in this way from the viewpoint of cost and processing characteristics. It is preferable.
- the processing reference surface made of the solid catalyst described above is usually formed by depositing a solid catalyst on a predetermined pad.
- a solid catalyst on a predetermined pad.
- limiting in particular in the said pad For example, rubber
- the workpiece and the workpiece reference surface are moved relative to each other in the processing liquid to cause the active species generated on the surface of the workpiece reference surface to react with the workpiece, thereby to change the workpiece surface.
- Surface processing is performed by removing.
- the processing conditions for CARE can be set, for example, within a range of platen rotation speed: 5 to 200 rpm, workpiece rotation speed: 5 to 200 rpm, processing pressure: 10 hPa to 1000 hPa, and processing time: 5 to 120 minutes. .
- the CARE processing apparatus 100 includes a processing tank 124, a catalyst surface plate 126 rotatably disposed in the processing tank 124, and a workpiece 128 (mask blank substrate) with its surface (processing surface) facing downward.
- a substrate holder 130 for detachably holding the substrate.
- the substrate holder 130 is connected to the tip end of a rotary shaft 132 that is movable up and down and is provided at a position that is parallel and eccentric to the rotational axis of the catalyst surface plate 126.
- platinum 142 having a predetermined thickness as a solid catalyst is formed on the surface of the base material 140 of a rigid material made of stainless steel, for example.
- the solid catalyst may be bulk, but may be configured such that platinum 142 is formed on a base material having elasticity, such as a fluorine-based rubber material, which is inexpensive and has good shape stability.
- a heater 170 as a temperature control mechanism for controlling the temperature of the workpiece 128 held by the holder 130 is embedded in the rotating shaft 132 inside the substrate holder 130.
- a processing liquid supply nozzle 174 that supplies a processing liquid (such as pure water) controlled to a predetermined temperature by a heat exchanger 172 as a temperature control mechanism to the inside of the processing tank 124 is disposed.
- a fluid flow path 176 as a temperature control mechanism for controlling the temperature of the catalyst surface plate 126 is provided inside the catalyst surface plate 126.
- the CARE processing method by the CARE processing apparatus 100 is as follows. A processing liquid is supplied from the processing liquid supply nozzle 174 toward the catalyst surface plate 126. Then, the workpiece 128 held by the substrate holder 130 is pressed against the surface of the platinum (catalyst) 142 of the catalyst platen 126 with a predetermined pressure, and the workpiece 128 is pressed against the platinum (catalyst) 142 of the catalyst platen 126. The catalyst surface plate 126 and the workpiece 128 are rotated while the treatment liquid is interposed in the contact portion (processing portion), and the surface (lower surface) of the workpiece 128 is removed and etched (etched) flatly.
- the workpiece 128 is held in close proximity to the platinum (catalyst) 142 without pressing the workpiece 128 held by the substrate holder 130 against the platinum (catalyst) 142 of the catalyst surface plate 126 with a predetermined pressure.
- the surface of the workpiece 128 may be removed (etched) flatly.
- the PSD of the intermediate spatial frequency and high spatial frequency region is adjusted to a predetermined value or less, and the mask blank substrate of the present invention is manufactured.
- FIG. 2 is a schematic cross-sectional view showing the multilayer reflective film-coated substrate 20 of the present embodiment.
- the substrate 20 with a multilayer reflective film of the present embodiment has a structure having the multilayer reflective film 21 on the main surface on the side where the transfer pattern of the mask blank substrate 10 described above is formed.
- the multilayer reflective film 21 provides 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 21 is not particularly limited as long as it reflects EUV light. However, the reflectance of the multilayer reflective film 21 is usually 65% or more, and the upper limit is usually 73%.
- the multilayer reflective film 21 includes 40 thin films (high refractive index layer) made of a high refractive index material and 40 thin films made of a low refractive index material (low refractive index layer) alternately. A structure in which about 60 cycles are laminated can be adopted.
- the multilayer reflective film 21 for EUV light having a wavelength of 13 to 14 nm is preferably a Mo / Si periodic laminated film in which Mo films and Si films are alternately laminated for about 40 periods.
- Ru / Si periodic multilayer films, Mo / Be periodic multilayer films, Mo compounds / Si compound periodic multilayer films, Si / Nb periodic multilayer films, Si / Mo / Ru A periodic multilayer film, a Si / Mo / Ru / Mo periodic multilayer film, a Si / Ru / Mo / Ru periodic multilayer film, or the like can be used.
- the method for forming the multilayer reflective film 21 is known in the art, but can be formed by depositing each layer by, for example, a magnetron sputtering method or an ion beam sputtering method.
- a magnetron sputtering method or an ion beam sputtering method for example, an Si film having a thickness of several nanometers is first formed on the substrate 10 using an Si target by an ion beam sputtering method, and then thickened using a Mo target. A Mo film having a thickness of about several nanometers is formed, and this is taken as one period, and laminated for 40 to 60 periods to form the multilayer reflective film 21.
- a protective film 22 (see FIG. 3) is formed to protect the multilayer reflective film 21 from dry etching or wet cleaning in the manufacturing process of the reflective mask for EUV lithography. You can also Thus, the form which has the multilayer reflective film 21 and the protective film 22 on the board
- Examples of the material of the protective film 22 include Ru, Ru- (Nb, Zr, Y, B, Ti, La, Mo), Si- (Ru, Rh, Cr, B), Si, Zr, Nb. , La, B, and the like can be used, but among these, when a material containing ruthenium (Ru) is applied, the reflectance characteristics of the multilayer reflective film become better. Specifically, Ru, Ru- (Nb, Zr, Y, B, Ti, La, Mo) are preferable. Such a protective film is particularly effective when an absorber film described later is made of a Ta-based material and the absorber film is patterned by dry etching with a Cl-based gas.
- the surface of the multilayer reflective film 21 or the protective film 22 (that is, the surface of the substrate 20 with a multilayer reflective film) is a white interferometer having a region of 0.14 mm ⁇ 0.1 mm.
- an area of 1 [mu] m ⁇ 1 [mu] m power spectral density of the spatial frequency 1 [mu] m -1 or 100 [mu] m -1 or less obtained by measuring an atomic force microscope is preferably 20 nm 4 or less.
- the power spectrum in the region of 0.14 mm ⁇ 0.1 mm, at white light interferometer, less spatial frequency 1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 obtained by measuring in pixels number 640 ⁇ 480 density is at 1 ⁇ 10 2 nm 4 or 3.5 ⁇ 10 7 nm 4 below
- the spatial frequency 1 [mu] m -1 or 100 [mu] m -1 or less of the power spectrum obtained by measuring an area of 1 [mu] m ⁇ 1 [mu] m with an atomic force microscope density is 0.5 nm 4 or more 16 nm 4 or less.
- the region of 0.14 mm ⁇ 0.1 mm, at white light interferometer, the power spectrum in the following spatial frequency 1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 obtained by measuring in pixels number 640 ⁇ 480 density is at 3 ⁇ 10 7 nm 4 below 2 ⁇ 10 2 nm 4 or more
- the power spectral density of the spatial frequency 1 [mu] m -1 or 100 [mu] m -1 or less obtained by measuring an area of 1 [mu] m ⁇ 1 [mu] m with an atomic force microscope 1nm is 4 or more 15nm 4 below.
- a decrease in pattern contrast due to flare during pattern transfer is suppressed, and a 266 nm UV laser or a 193 nm ArF excimer laser in the wavelength range of 150 nm to 365 nm is used as the inspection light source mentioned above.
- the defect inspection of the multilayer reflective film-coated substrate 20 is performed with a high-sensitivity defect inspection apparatus, the number of detected defects including pseudo defects can be significantly reduced.
- the high-sensitivity defect inspection apparatus using 13.5 nm EUV light can perform the defect inspection of the surface of the multilayer reflective film-coated substrate 20, scattering from the multilayer reflective film can be suppressed. It is possible to reliably perform defect inspection under inspection conditions (for example, inspection sensitivity conditions capable of detecting a 15 nm size defect in terms of SEVD).
- the mask blank substrate of the present invention has a sufficiently low roughness (PSD) in the intermediate spatial frequency and high spatial frequency regions and is very excellent in smoothness. Therefore, the multilayer reflective film formed thereon As described above, the PSD in the intermediate spatial frequency and high spatial frequency regions of the protective film (or the protective film formed thereon) can be easily set within a range in which the number of detected defects including pseudo defects can be greatly reduced. is there. Since the defect inspection under the high-sensitivity inspection conditions can be reliably performed in this way, the mask blank substrate of the present invention is used as a mask blank substrate for EUV lithography that requires such high-sensitivity inspection in the manufacturing stage. Useful.
- the surface of the multilayer reflective film 21 or the protective film 22 has a spatial frequency of 10 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇ obtained by measuring an area of 1 ⁇ m ⁇ 1 ⁇ m with an atomic force microscope.
- the power spectral density of 1 or less is preferably 7.5 nm or less, more preferably 4 or less, more preferably a power having a spatial frequency of 10 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇ 1 or less obtained by measuring an area of 1 ⁇ m ⁇ 1 ⁇ m with an atomic force microscope.
- Spectral density is 6.5 nm 4 or less.
- the power spectral density of a spatial frequency of 10 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇ 1 or less obtained by measuring an area of 1 ⁇ m ⁇ 1 ⁇ m with an atomic force microscope is 5 nm 4 or less, particularly preferably a region of 1 ⁇ m ⁇ 1 ⁇ m. Is measured with an atomic force microscope, and the power spectral density at a spatial frequency of 10 ⁇ m ⁇ 1 to 100 ⁇ m ⁇ 1 is 0.5 nm 4 to 5 nm 4 .
- the multilayer reflective film 21 is formed on the main surface of the substrate 10.
- the film is formed by sputtering so that the high refractive index layer and the low refractive index layer are deposited at a predetermined incident angle with respect to the normal line.
- the sputtered particles of the high-refractive index material and the low-refractive index material are made to be normal to the main surface of the substrate 10 by ion beam sputtering using a target having a high refractive index material and a low refractive index material.
- the number of detected defects including pseudo defects can be greatly reduced, and the surface of the multilayer reflective film 21 or the protective film 22 is smooth. Therefore, it is possible to efficiently manufacture a substrate with a multilayer reflective film having a multilayer reflective film excellent in EUV light reflectance characteristics.
- the protective film 22 formed on the multilayer reflective film 21 is continuously deposited obliquely with respect to the normal of the main surface of the mask blank substrate 10 after the multilayer reflective film 21 is formed.
- a back surface conductive film 23 (see FIG. 3) is provided on the surface of the mask blank substrate 10 opposite to the surface in contact with the multilayer reflective film 21 for the purpose of electrostatic chucking. It can also be formed.
- the multilayer reflective film 21 and the protective film 22 are provided on the side on which the transfer pattern on the mask blank substrate 10 is formed, and the back surface conductive film 23 is provided on the surface opposite to the surface in contact with the multilayer reflective film 21.
- a form having a multilayer reflective film-coated substrate in the present invention can also be used.
- the electrical characteristics (sheet resistance) required for the back conductive film 23 are usually 100 ⁇ / ⁇ or less.
- the formation method of the back surface conductive film 23 is well-known, for example, can be formed by magnetron sputtering method or ion beam sputtering method using a target of a metal such as Cr or Ta or an alloy.
- the back surface is formed on the back surface opposite to the main surface.
- the present invention is not limited to such an order.
- the protective film 22 may be further formed to manufacture the substrate 20 with a multilayer reflective film.
- an underlayer may be formed between the mask blank substrate 10 and the multilayer reflective film 21.
- the underlayer can be formed for the purpose of improving the smoothness of the main surface of the substrate 10, the purpose of reducing defects, the purpose of enhancing the reflectivity of the multilayer reflective film 21, and the purpose of correcting the stress of the multilayer reflective film 21.
- FIG. 3 is a schematic cross-sectional view showing the reflective mask blank 30 of the present embodiment.
- the reflective mask blank 30 absorbs the transfer pattern on the protective film 22 of the substrate 20 with the multilayer reflective film described above (or on the multilayer reflective film 21 when the protective film 22 is not present).
- the body film 24 is formed.
- the material of the absorber film 24 is not particularly limited. For example, it has a function of absorbing EUV light, and it is preferable to use a material containing Ta (tantalum) alone or Ta as a main component.
- the material mainly composed of Ta is usually an alloy of Ta.
- Such an absorber film preferably has an amorphous or microcrystalline structure in terms of smoothness and flatness.
- the material containing Ta as a main component include a material containing Ta and B, a material containing Ta and N, a material containing Ta and B, and further containing at least one of O and N, and a material containing Ta and Si.
- a material containing Ta, Si and N, a material containing Ta and Ge, a material containing Ta, Ge and N can be used.
- an amorphous structure can be easily obtained, and the smoothness of the absorber film 24 can be improved. Furthermore, if N and O are added to Ta, the resistance to oxidation is improved, so that the stability over time can be improved.
- the surface of the absorber film 24 is within the above range (that is, the intermediate space). 4 ⁇ 10 7 nm 4 or less in the frequency domain, it has a power spectral density of the 20 nm 4 below) in the high spatial frequency region, from the viewpoint of reducing the number of defects detected including pseudo defects.
- the absorber film 24 Is preferably an amorphous structure. The crystal structure can be confirmed by an X-ray diffractometer (XRD).
- the surface of the absorber film 24 is preferably a spatial frequency 1 [mu] m -1 or 10 [mu] m -1 or less of the power spectral density obtained by measuring an area of 1 [mu] m ⁇ 1 [mu] m by an atomic force microscope is 20 nm 4 or less , more preferably, the spatial frequency 1 [mu] m -1 or 10 [mu] m -1 or less of the power spectral density obtained by measuring an area of 1 [mu] m ⁇ 1 [mu] m by an atomic force microscope is 1 nm 4 or more 15 nm 4 or less.
- the reflective mask blank 30 of the reflective mask blank 30 can be used with a high-sensitivity defect inspection apparatus using a 266 nm UV laser or a 193 nm ArF excimer laser in the wavelength range of 150 nm to 365 nm as the inspection light source mentioned above.
- the number of detected defects including pseudo defects can be significantly reduced.
- the mask blank substrate 10 of the present invention has a sufficiently low roughness (PSD) in the intermediate spatial frequency and high spatial frequency regions and is very smooth.
- PSD sufficiently low roughness
- the PSD in the intermediate spatial frequency and high spatial frequency regions of the film 21 (or the protective film 22 formed thereon) is also in a range in which the number of detected defects including pseudo defects can be greatly reduced as described above. Is easy.
- the PSD in the intermediate spatial frequency and high spatial frequency regions of the absorber film 24 formed on the multilayer reflective film 21 (or protective film 22) also greatly increases the number of detected defects including pseudo defects as described above. It is easy to make it within a range that can be reduced.
- the surface of the absorber film 24 preferably has a power spectral density of 5 nm 4 or less at a spatial frequency of 10 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇ 1 or less obtained by measuring a 1 ⁇ m ⁇ 1 ⁇ m region with an atomic force microscope.
- the spatial frequency 10 [mu] m -1 or 100 [mu] m -1 or less of the power spectral density obtained by measuring an area of 1 [mu] m ⁇ 1 [mu] m by an atomic force microscope is 0.5 nm 4 or 5 nm 4 or less.
- the reflective mask blank of the present invention is not limited to the configuration shown in FIG.
- a resist film serving as a mask for patterning the absorber film 24 can be formed on the absorber film 24, and a reflective mask blank with a resist film is also a reflective mask blank of the present invention.
- the resist film formed on the absorber film 24 may be a positive type or a negative type. Further, it may be used for electron beam drawing or laser drawing.
- a so-called hard mask (etching mask) film can be formed between the absorber film 24 and the resist film, and this aspect is also a reflective mask blank in the present invention.
- FIG. 4 is a schematic diagram showing the reflective mask 40 of the present embodiment.
- the reflective mask 40 of the present embodiment has a configuration in which the absorber film 24 in the reflective mask blank 30 is patterned to form the absorber pattern 27 on the protective film 22 or the multilayer reflective film 21.
- exposure light such as EUV light
- the exposure light is absorbed in a portion of the mask surface where the absorber film 24 is present, and the other portions where the absorber film 24 is removed are exposed. Since the exposure light is reflected by the protective film 22 and the multilayer reflective film 21, it can be used as a reflective mask 40 for lithography.
- a circuit pattern or the like based on the absorber pattern 27 of the reflective mask 40 is formed on a resist film formed on a transfer target such as a semiconductor substrate by a lithography process using the reflective mask 40 described above and an exposure apparatus. By transferring the transfer pattern and passing through various other steps, a semiconductor device in which various patterns such as wirings are formed on the semiconductor substrate can be manufactured.
- a reference mark is formed on the mask blank substrate 10, the multilayer reflective film-coated substrate 20, and the reflective mask blank 30.
- the reference mark and the position of the fatal defect detected by the high sensitivity defect inspection apparatus are determined. Coordinates can be managed. Based on the position information (defect data) of the obtained fatal defect, when producing the reflective mask 40, there is a fatal defect based on the above-described defect data and transferred pattern (circuit pattern) data.
- the drawing data can be corrected so that the absorber pattern 27 is formed at the existing location, and defects can be reduced.
- Example 1 ⁇ Manufacture of mask blank substrate> (Polishing and surface processing by MRF)
- a SiO 2 —TiO 2 glass substrate having a size of 152.4 mm ⁇ 152.4 mm and a thickness of 6.35 mm is prepared as a mask blank substrate, and the front and back surfaces of the glass substrate are prepared using a double-side polishing apparatus.
- the surface roughness of the surface of the glass substrate thus obtained was measured with an atomic force microscope.
- the root mean square roughness (Rms) was 0.15 nm.
- the surface shape (surface form, flatness) and TTV (plate thickness variation) of the 148 mm ⁇ 148 mm region on the front and back surfaces of the glass substrate were measured with a wavelength shift interferometer using a wavelength modulation laser.
- the flatness of the front and back surfaces of the glass substrate was 290 nm (convex shape).
- the measurement result of the surface shape (flatness) of the glass substrate surface is stored in a computer as height information with respect to a reference surface at each measurement point, and the reference value of the surface flatness required for the glass substrate is 50 nm (convex shape).
- the difference was calculated by a computer in comparison with the reference value 50 nm for the back flatness.
- processing conditions for local surface processing according to the required removal amount were set for each processing spot shape region in the glass substrate surface.
- the dummy substrate is processed with a spot without moving the substrate for a certain period of time in the same way as in actual processing, and the shape is converted to the same measuring machine as the apparatus for measuring the surface shape of the front and back surfaces.
- the spot processing volume per unit time was calculated. Then, according to the necessary removal amount obtained from the spot information and the surface shape information of the glass substrate, the scanning speed for raster scanning the glass substrate was determined.
- the front and back flatness of the glass substrate is locally below the reference value by the magneto-visco-elastic fluid polishing (Magneto Rheological Finishing MRF) processing method.
- MRF magneto-visco-elastic fluid polishing
- Surface processing was performed to adjust the surface shape.
- the magnetic viscoelastic fluid used at this time contained an iron component, and the polishing slurry was an alkaline aqueous solution + abrasive (about 2 wt%) and an abrasive: cerium oxide.
- the glass substrate was immersed in a cleaning tank containing a hydrochloric acid aqueous solution having a concentration of about 10% (temperature: about 25 ° C.) for about 10 minutes, and then rinsed with pure water and dried with isopropyl alcohol (IPA).
- IPA isopropyl alcohol
- the flatness of the front and back surfaces was about 40 to 50 nm.
- the surface roughness of the glass substrate surface was measured by using an atomic force microscope to measure the 1 ⁇ m ⁇ 1 ⁇ m region in the center of the main surface (142 mm ⁇ 142 mm) on the side where the transfer pattern is formed.
- the roughness (Rms) was 0.37 nm, which was in a state of being rougher than the surface roughness before local surface processing by MRF.
- the surface state of this glass substrate was measured with a non-contact surface shape measuring instrument NewView 6300 of a white interferometer manufactured by Zygo (measurement area: 0.14 mm ⁇ 0.1 mm, number of pixels: 640 ⁇ 480), and power spectrum analysis was performed. went. The results are shown in FIG. 5 (raw).
- unprocessed is data obtained by observing an area of 0.14 mm ⁇ 0.1 mm with the number of pixels of 640 ⁇ 480. “EEM processing” will be described later.
- the spatial frequency 1 ⁇ 10 -2 ⁇ m power spectral density at -1 to 1 [mu] m -1 or less at a maximum 4.5 ⁇ 10 6 nm 4 (a spatial frequency 1 ⁇ 10 -2 ⁇ m -1) met See gray line in FIG. 5).
- the surface roughness of the glass substrate was measured with an atomic force microscope (measurement region: 1 ⁇ m ⁇ 1 ⁇ m), and the result of the power spectrum analysis is shown as “EEM unprocessed” in FIG.
- the power spectral density at a spatial frequency of 1 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇ 1 or less was 14 nm 4 (spatial frequency 2 ⁇ m ⁇ 1 ) at the maximum.
- the power spectral density at a spatial frequency of 1 ⁇ m ⁇ 1 to 10 ⁇ m ⁇ 1 is 14 nm 4 at maximum (spatial frequency 2 ⁇ m ⁇ 1 ), and the power density at a spatial frequency of 10 ⁇ m ⁇ 1 to 100 ⁇ m ⁇ 1 is 8.32 nm at maximum. 4 (spatial frequency 11 ⁇ m ⁇ 1 ) (see dotted line in FIG. 6).
- Processing liquid Neutral aqueous solution (pH: 7) containing fine powder particles (concentration: 3 wt%)
- Fine powder particles colloidal silica, average particle size; about 80 nm
- Rotating body Polyurethane rotating sphere
- the end surface of the glass substrate was scrubbed, and then the front and back surfaces were subjected to megasonic cleaning with a low-concentration hydrofluoric acid aqueous solution (frequency 3 MHz, 60 seconds), rinsing with pure water, and drying.
- a low-concentration hydrofluoric acid aqueous solution frequency 3 MHz, 60 seconds
- the surface state of the glass substrate surface-processed by EEM was measured with a non-contact surface shape measuring instrument NewView 6300 of a white interferometer manufactured by Zygo, as described above (measurement area: 0.14 mm ⁇ 0.1 mm, number of pixels 640). ⁇ 480), power spectrum analysis was performed. The result is shown as “EEM processing” in FIG.
- the power spectral density in the spatial frequency 1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 or less is maximized at 10 6 nm 4 (a spatial frequency 1 ⁇ 10 -2 ⁇ m -1).
- a spatial frequency 1 ⁇ 10 -2 ⁇ m -1 As described above, by surface processing by EEM, it can be seen that it was possible to reduce the roughness of the intermediate spatial frequency domain (1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 or less).
- the surface state of the glass substrate obtained by EEM surface processing was measured with an atomic force microscope (measurement region: 1 ⁇ m ⁇ 1 ⁇ m), and the result of power spectrum analysis is shown as “EEM processing” in FIG. .
- the power spectral density at a spatial frequency of 1 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇ 1 or less was 25 nm 4 at maximum (spatial frequency 3 ⁇ m ⁇ 1 ) (see the solid line in FIG. 6). More specifically, the maximum power spectral density at a spatial frequency of 1 ⁇ m ⁇ 1 to 10 ⁇ m ⁇ 1 is 25 nm 4 (spatial frequency 3 ⁇ m ⁇ 1 ), and the maximum power spectral density at a spatial frequency of 10 ⁇ m ⁇ 1 to 100 ⁇ m ⁇ 1 is 9. It was 0 nm 4 (spatial frequency 10 ⁇ m ⁇ 1 ). As described above, it can be seen from the results of FIG. 6 that the PSD at the high spatial frequency was not significantly changed by the surface processing by EEM.
- Processing fluid Pure water Catalyst: Pt Substrate rotation speed: 10.3 rotations / minute Catalyst constant rotation speed: 10 rotations / minute Processing time: 50 minutes Processing pressure: 250 hPa
- the surface state of the glass substrate surface-treated by CARE was measured with a non-contact surface shape measuring instrument NewView 6300 of a white interferometer manufactured by Zygo (measurement area: 0.14 mm ⁇ 0.1 mm, number of pixels: 640 ⁇ 480). A power spectrum analysis was performed.
- the surface state of the glass substrate was measured with an atomic force microscope (measurement region: 1 ⁇ m ⁇ 1 ⁇ m), and the result of power spectrum analysis is shown in FIG. 8 (solid line indicated as “CARE processing”).
- the maximum power spectral density at a spatial frequency of 1 ⁇ m ⁇ 1 to 100 ⁇ m ⁇ 1 was 5.0 nm 4 (spatial frequency 2 ⁇ m ⁇ 1 ).
- the power spectral density at a spatial frequency of 1 ⁇ m ⁇ 1 or more and 10 ⁇ m ⁇ 1 or less is 5.0 nm 4 at maximum (spatial frequency 2 ⁇ m ⁇ 1 ), and the power spectral density at a spatial frequency of 10 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇ 1 or less is maximum. It was 1.9 nm 4 (spatial frequency 11 ⁇ m ⁇ 1 ).
- the root mean square roughness Rms was as good as 0.08 nm.
- the inspection sensitivity condition was an inspection sensitivity condition in which a defect having a size of 20 nm can be detected by a sphere equivalent diameter SEVD (Sphere Equivalent Volume Diameter).
- SEVD Sphere Equivalent Volume Diameter
- the defect area (S) and the defect height (h) can be measured by an atomic force microscope (AFM).
- AFM atomic force microscope
- MAGICS M7360 manufactured by Lasertec Corporation
- a defect inspection was performed on a 132 mm ⁇ 132 mm region on the main surface of the mask blank glass substrate in the same manner as described above.
- the total number of detected defects including pseudo defects was 15, and the number of detected defects was greatly reduced compared to the conventional number of detected defects of 100,000. .
- a multilayer reflective film in which high refractive index layers and low refractive index layers are alternately laminated is formed by ion beam sputtering, and this multilayer reflective film is further formed.
- a protective film was formed thereon to produce a substrate with a multilayer reflective film.
- the multilayer reflective film was formed as 40 pairs (film thickness) with a 4.2 nm-thickness Si film (high refractive index layer) and a 2.8 nm-thickness Mo film (low refractive index layer) as one pair. Total 280 nm). Further, the protective film is made of Ru having a thickness of 2.5 nm.
- the multilayer reflective film was formed by ion beam sputtering so that the incident angle of the sputtered particles of the Si film and the sputtered particles of the Mo film was 30 degrees with respect to the normal line of the main surface of the substrate.
- the surface state of the protective film was measured with a non-contact surface shape measuring instrument NewView 6300 of white interferometer manufactured by Zygo (measurement area: 0.14 mm ⁇ 0.1 mm, number of pixels: 640 ⁇ 480), and power spectrum analysis was performed. went.
- the power spectrum density at a spatial frequency of 1 ⁇ m ⁇ 1 to 100 ⁇ m ⁇ 1 is 15.8 nm 4 (space)
- the frequency was 5 ⁇ m ⁇ 1 ).
- the power spectral density at a spatial frequency of 1 ⁇ m ⁇ 1 or more and 10 ⁇ m ⁇ 1 or less is 15.8 nm 4 at maximum (spatial frequency 5 ⁇ m ⁇ 1 ), and the power spectral density at a spatial frequency of 10 ⁇ m ⁇ 1 or more and 100 ⁇ m ⁇ 1 or less is maximum.
- a defect inspection was performed on a 132 mm ⁇ 132 mm region on the protective film surface of the multilayer reflective film-coated substrate of Example 1. .
- the total number of detected defects including pseudo defects was 21,705, and the number of pseudo defects was significantly reduced as compared with the conventional number of detected defects exceeding 100,000.
- MAGICS M7360 manufactured by Lasertec Co., Ltd.
- the sensitivity condition was the highest inspection sensitivity condition, and as a result, the total number of detected defects including pseudo defects was 24.
- the spatial frequency 1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 definitive following PSD surface of the protective film, and 1.28 ⁇ 10 7 nm 4 has a 4 ⁇ 10 7 nm 4 below
- the undulation (local slope) having a spatial wavelength of 2 ⁇ m or more and 1 mm or less is 70 ⁇ rad or 200 ⁇ rad or less, it is also possible to prevent a decrease in pattern contrast due to flare during pattern transfer.
- reference marks for coordinate management of the position of the defect are provided at four locations outside the transfer pattern formation region (142 mm ⁇ 142 mm). Was formed by a focused ion beam.
- a back surface conductive film was formed by DC magnetron sputtering on the back surface of the substrate with a multilayer reflection film described above where the multilayer reflection film was not formed.
- Ar + N 2 gas Ar + N 2 gas
- an absorber film made of a TaBN film was formed on the surface of the protective film of the substrate with a multilayer reflective film described above by a DC magnetron sputtering method, thereby producing a reflective mask blank.
- the elemental composition of the absorber film was measured by Rutherford backscattering analysis, Ta: 80 atomic%, B: 10 atomic%, and N: 10 atomic%.
- the film thickness of the absorber film was 65 nm.
- the crystal structure of the absorber film was measured with an X-ray diffractometer (XRD), it was an amorphous structure.
- a resist was applied to the surface of the absorber film described above by a spin coating method, and a resist film having a thickness of 150 nm was formed through heating and cooling processes. Next, a resist pattern was formed through drawing and development steps of a desired pattern.
- patterning of the TaBN film as the absorber film was performed by dry etching with Cl 2 + He gas to form an absorber pattern on the protective film. Thereafter, the resist film was removed, and chemical cleaning similar to the above was performed to produce a reflective mask.
- defect data and transferred pattern (circuit pattern) data are obtained based on defect data created based on reference marks formed at four locations outside the transfer pattern formation region.
- the drawing data was corrected so that the absorber pattern was arranged at the location where the fatal defect was present, and a reflective mask was produced.
- the obtained reflective mask was subjected to defect inspection using a high-sensitivity defect inspection apparatus (“Teron 600 series” manufactured by KLA-Tencor), no defects were confirmed.
- Table 1 summarizes the results of power spectrum analysis performed in each process of manufacturing the above mask blank substrate and multilayer reflective film-coated substrate.
- ⁇ 1 spatial frequency: 1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 or less
- ⁇ 2 spatial frequency: 1 [mu] m -1 or 100 [mu] m -1 or less Left / Right: 1 [mu] m -1 or 10 [mu] m -1 or less of PSD / 10 [mu] m - PSD between 1 and 100 ⁇ m -1 * 3: ML: Multilayer reflective film
- a semiconductor device can be manufactured without causing a transfer pattern defect.
- Example 1 In Example 1 described above, the mask blank substrate and the multilayer reflective film-coated substrate were prepared in the same manner as in Example 1 except that after ERF and CARE surface processing was not performed after surface processing by MRF, double-sided touch polishing was performed. Produced.
- Table 2 summarizes the results of power spectrum analysis performed in each process of manufacturing the mask blank substrate and the substrate with the multilayer reflective film, and the defect inspection results using the high-sensitivity defect inspection apparatus. It is. In addition, the measurement result of the power spectral density of the mask blank substrate after MRF / double-sided touch polishing is shown in FIG. 8 (unprocessed).
- ⁇ 1 spatial frequency: 1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 or less
- ⁇ 2 spatial frequency: 1 [mu] m -1 or 100 [mu] m -1 or less Left / Right: 1 [mu] m -1 or 10 [mu] m -1 or less of PSD / 10 [mu] m - PSD between 1 and 100 ⁇ m -1 * 3: ML: Multilayer reflective film
- the number of detected defects including pseudo defects is 22 , Increased to 803 compared with Example 1.
- the number of detected defects was 58.
- EUV light (wavelength: 13.5 nm) is irradiated on the surface of the substrate with a multilayer reflective film
- EUV light scattering (speckle) that is an obstacle in a defect inspection apparatus that can detect defects of 15 nm size by SEVD is strongly observed. It was. Therefore, in a high-sensitivity defect inspection apparatus with an inspection light source wavelength of 13.5 nm that can detect defects of 15 nm size by SEVD, speckles due to scattering of EUV light from the multilayer reflective film and the protective film cannot be ignored, and the multilayer reflective film is provided. The defect inspection of the substrate cannot be performed.
- Example 2 In the above-described Example 1, a polishing liquid containing alkaline colloidal silica abrasive grains (average particle size: about 80 nm) after the processing of the magnetic viscoelastic fluid polishing and the cleaning process and before the surface processing by EEM A mask blank substrate and a substrate with a multilayer reflective film were prepared in the same manner as in Example 1 except that double-sided touch polishing was performed using
- Table 3 summarizes the results of power spectrum analysis performed in each process of manufacturing the above mask blank substrate and multilayer reflective film coated substrate and the results of defect inspection using a high-sensitivity defect inspection apparatus. It is.
- ⁇ 1 spatial frequency: 1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 or less
- ⁇ 2 spatial frequency: 1 [mu] m -1 or 100 [mu] m -1 or less Left / Right: 1 [mu] m -1 or 10 [mu] m -1 or less of PSD / 10 [mu] m - PSD between 1 and 100 ⁇ m -1 * 3: ML: Multilayer reflective film
- Example 3 As shown in Table 3 above, as a result of performing defect inspection on the mask blank substrate using a high sensitivity defect inspection apparatus (“Teron 600 series” manufactured by KLA-Tencor) with an inspection light source wavelength of 193 nm, the number of detected defects including pseudo defects The number of detected defects was significantly reduced as compared with Example 1. In addition, as a result of defect inspection using a high-sensitivity defect inspection apparatus (MAGICS M7360 manufactured by Lasertec Corporation) having an inspection light source wavelength of 266 nm, the number of detected defects was 13, which was slightly reduced compared to the number of detected defects in Example 1. .
- MAGICS M7360 manufactured by Lasertec Corporation
- Example 1 As a result of performing defect inspection on the substrate with a multilayer reflective film using a high-sensitivity defect inspection apparatus (“Teron 600 series” manufactured by KLA-Tencor) having an inspection light source wavelength of 193 nm, the number of detected defects including pseudo defects is 11 , 754, and the number of detected defects was significantly reduced as compared with Example 1. In addition, as a result of defect inspection using a high-sensitivity defect inspection apparatus (MAGICS M7360 manufactured by Lasertec Corporation) having an inspection light source wavelength of 266 nm, the number of detected defects was 20, which was slightly reduced compared to Example 1.
- MAGICS M7360 manufactured by Lasertec Corporation
- Example 1 the mask blank substrate and the multilayer reflective film-coated substrate were the same as in Example 1 except that the CARE catalyst was changed to SUS and the aqua regia was washed with sulfuric acid (temperature about 65 ° C.). Was made.
- Table 4 summarizes the results of the power spectrum analysis performed in each process of manufacturing the mask blank substrate and the substrate with the multilayer reflective film, and the defect inspection results using the high-sensitivity defect inspection apparatus. It is.
- ⁇ 1 spatial frequency: 1 ⁇ 10 -2 ⁇ m -1 or more 1 [mu] m -1 or less
- ⁇ 2 spatial frequency: 1 [mu] m -1 or 100 [mu] m -1 or less Left / Right: 1 [mu] m -1 or 10 [mu] m -1 or less of PSD / 10 [mu] m - PSD between 1 and 100 ⁇ m -1 * 3: ML: Multilayer reflective film
- the number of detected defects including pseudo defects is 22
- the number of detected defects increased compared to Example 1
- the number of detected defects did not exceed 100,000
- a defect inspection of a 132 mm ⁇ 132 mm region could be performed.
- MAGICS M7360 manufactured by Lasertec Co., Ltd. having an inspection light source wavelength of 266 nm
- the number of detected defects was 27, which was also slightly increased compared to Example 1.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Preparing Plates And Mask In Photomechanical Process (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
Description
(2)中間空間周波数領域(Mid spatial frequency roughness、MSFR)・・・この領域におけるうねりは、パターン転写時に発生するフレアーと呼ばれる迷光によるパターンコントラストの低下が生じるため、空間波長2μm以上1mm以下において、200μrad以下が要求されている。
(3)高空間周波数領域(High spatial frequency roughness、HSFR)・・・基板上に形成される多層反射膜の反射率特性の観点から、表面粗さについてRms(二乗平均平方根粗さ)で0.15nm以下が要求されている。
(構成1)
本発明の構成1は、リソグラフィーに使用されるマスクブランク用基板であって、該マスクブランク用基板の転写パターンが形成される側の主表面における0.14mm×0.1mmの領域を白色干渉計にて、ピクセル数640×480で測定して得られる空間周波数1×10-2μm-1以上1μm-1以下におけるパワースペクトル密度が4×106nm4以下であり、前記主表面における1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上におけるパワースペクトル密度が10nm4以下である、マスクブランク用基板である。
本発明の構成2は、前記主表面の1μm×1μmの領域を原子間力顕微鏡で測定して得られる二乗平均平方根粗さ(Rms)が0.13nm未満であることを特徴とする構成1に記載のマスクブランク用基板である。
本発明の構成3は、前記主表面の1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上10μm-1以下におけるパワースペクトル密度が1nm4以上10nm4以下であることを特徴とする構成1又は2に記載のマスクブランク用基板である。
本発明の構成4は、前記基板が、EUVリソグラフィーに使用されるマスクブランク用基板であることを特徴とする構成1~3のいずれかに記載のマスクブランク用基板である。
本発明の構成5は、構成1~4のいずれかに記載のマスクブランク用基板の前記主表面上に、高屈折率層と低屈折率層とを交互に積層した多層反射膜を有することを特徴とする多層反射膜付き基板である。
本発明の構成6は、前記多層反射膜上に保護膜を有することを特徴とする構成5に記載の多層反射膜付き基板である。
本発明の構成7は、リソグラフィーに使用されるマスクブランク用基板の主表面上に、高屈折率層と低屈折率層とを交互に積層した多層反射膜を有する多層反射膜付き基板であって、前記多層反射膜が形成されている側の前記多層反射膜付き基板表面における0.14mm×0.1mmの領域を白色干渉計にて、ピクセル数640×480で測定して得られる空間周波数1×10-2μm-1以上1μm-1以下におけるパワースペクトル密度が4×107nm4以下であり、前記多層反射膜付き基板表面における1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上100μm-1以下におけるパワースペクトル密度が20nm4以下であることを特徴とする多層反射膜付き基板である。
本発明の構成8は、前記多層反射膜付き基板表面の1μm×1μmの領域を原子間力顕微鏡で測定して得られる二乗平均平方根粗さ(Rms)が0.13nm未満であることを特徴とする構成7に記載の多層反射膜付き基板である。
本発明の構成9は、前記多層反射膜上に保護膜を有することを特徴とする構成7又は8に記載の多層反射膜付き基板である。
本発明の構成10は、構成5~9のいずれかに記載の多層反射膜付き基板の前記多層反射膜又は保護膜上に、転写パターンとなる吸収体膜を有することを特徴とする反射型マスクブランクである。
本発明の構成11は、構成10に記載の反射型マスクブランクにおける前記吸収体膜がパターニングされてなる吸収体パターンを、前記多層反射膜又は保護膜上に有することを特徴とする反射型マスクである。
本発明の構成12は、リソグラフィーに使用されるマスクブランク用基板の転写パターンが形成される側の主表面を、所定の表面形態が得られるように表面加工する表面加工工程を有するマスクブランク用基板の製造方法であって、前記表面加工工程は、前記主表面における0.14mm×0.1mmの領域を、白色干渉計にて、ピクセル数640×480で測定して得られる空間周波数1×10-2μm-1以上1μm-1以下におけるパワースペクトル密度が4×106nm4以下となり、かつ前記主表面における1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上におけるパワースペクトル密度が10nm4以下となるように表面加工する工程であることを特徴とするマスクブランク用基板の製造方法である。
本発明の構成13は、前記表面加工工程は、前記主表面における0.14mm×0.1mmの領域を、白色干渉計にて、ピクセル数640×480で測定して得られる空間周波数1×10-2μm-1以上1μm-1以下におけるパワースペクトル密度が4×106nm4以下となるように表面加工する中間空間周波数領域粗さ低減工程と、前記主表面における1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上におけるパワースペクトル密度が10nm4以下となるように表面加工する高空間周波数領域粗さ低減工程とを有することを特徴とする構成12に記載のマスクブランク用基板の製造方法である。
本発明の構成14は、前記中間空間周波数領域粗さ低減工程の後に、前記高空間周波数領域粗さ低減工程を行うことを特徴とする構成13に記載のマスクブランク用基板の製造方法である。
本発明の構成15は、前記表面加工工程は、EEM(Elastic Emission Machining)及び/又は触媒基準エッチング:CARE(CAtalyst-Referred Etching)にて実施されることを特徴とする構成12~14のいずれかに記載のマスクブランク用基板の製造方法である。
本発明の構成16は、前記中間空間周波数領域粗さ低減工程は、EEMにて前記主表面を表面加工することにより実施されることを特徴とする構成13又は14に記載のマスクブランク用基板の製造方法である。
本発明の構成17は、前記高空間周波数領域粗さ低減工程は、触媒基準エッチングにて前記主表面を表面加工することにより実施されることを特徴とする構成13~16のいずれかに記載のマスクブランク用基板の製造方法である。
本発明の構成18は、前記基板が、EUVリソグラフィーに使用されるマスクブランク用基板であることを特徴とする構成12~17のいずれかに記載のマスクブランク用基板の製造方法である。
本発明の構成19は、構成1~4のいずれかに記載のマスクブランク用基板又は構成12~18のいずれかに記載の製造方法により製造されたマスクブランク用基板の前記主表面上に、高屈折率層と低屈折率層とを交互に積層した多層反射膜を形成する多層反射膜形成工程を有することを特徴とする多層反射膜付き基板の製造方法である。
本発明の構成20は、前記多層反射膜形成工程は、イオンビームスパッタリング法により前記高屈折率層及び低屈折率層を交互に成膜することにより実施されることを特徴とする構成19に記載の多層反射膜付き基板の製造方法である。
本発明の構成21は、前記多層反射膜形成工程では、高屈折率材料と低屈折率材料のターゲットを用いたイオンビームスパッタリングにより、前記高屈折率材料と前記低屈折率材料のスパッタ粒子を前記主表面の法線に対して0度以上30度以下の入射角度で交互に入射させて前記多層反射膜を形成することを特徴とする構成20に記載の多層反射膜付き基板の製造方法である。
本発明の構成22は、前記多層反射膜上に保護膜を形成する工程をさらに有することを特徴とする構成19~21のいずれかに記載の多層反射膜付き基板の製造方法である。
本発明の構成23は、構成11に記載の反射型マスクを用いて、露光装置を使用したリソグラフィープロセスを行い、被転写体上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である。
まず、本発明の一実施形態に係るマスクブランク用基板について以下に説明する。
マスクブランク用基板10の表面を、例えば白色干渉計や、原子間力顕微鏡で測定して得られた前記基板表面の凹凸をフーリエ変換することにより、前記凹凸を所定の空間周波数での振幅強度で表すことができる。これは、前記凹凸(つまり基板表面の微細形態)の測定データを、所定の空間周波数の波の和として表す、つまり基板の表面形態を所定の空間周波数の波に分けていくものである。
マスクブランク用基板10における代表的な表面粗さの指標であるRms(Root means square))は、二乗平均平方根粗さであり、平均線から測定曲線までの偏差の二乗を平均した値の平方根である。すなわちRmsは下式(1)で表される。
また、本実施形態のマスクブランク用基板10は、転写パターンが形成される側の主表面は、少なくともパターン転写精度、位置精度を得る観点から高平坦度となるように表面加工されていることが好ましい。EUVの反射型マスクブランク用基板の場合、基板10の転写パターンが形成される側の主表面142mm×142mmの領域において、平坦度が0.1μm以下であることが好ましく、特に好ましくは0.05μm以下である。また、転写パターンが形成される側と反対側の主表面は、露光装置にセットする時の静電チャックされる面であって、142mm×142mmの領域において、平坦度が1μm以下、特に好ましくは0.5μm以下である。
以上説明した本発明のマスクブランク用基板は、その転写パターンが形成される側の主表面を、所定の表面形態、すなわち前記主表面における0.14mm×0.1mmの領域を白色干渉計にて、ピクセル数640×480で測定して得られる空間周波数1×10-2μm-1以上1μm-1におけるパワースペクトル密度が4×106nm4以下となり、かつ主表面の1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上におけるパワースペクトル密度が10nm4以下となるように表面加工することによって製造することができる。なお、上述の表面粗さ(Rms)を達成するための表面加工も併せて行うことが好ましい。その表面加工方法は公知であり、本発明において特に制限なく採用することができる。
EEMは、0.1μm以下の微細粉末粒子を被加工物(マスクブランク用基板)に対してほぼ無荷重状態で接触させ、そのとき微細粉末粒子と被加工物の界面で発生する相互作用(一種の化学結合)により、被加工物表面原子を原子単位で除去するという非接触研磨方法である。
前記酸性水溶液としては、硫酸、塩酸、フッ酸、ケイフッ酸などの水溶液が挙げられる。非接触研磨における加工液に酸性水溶液を含有させることにより、研磨速度が向上する。ただし、酸の種類や濃度が高い場合は、ガラス基板を荒らしてしまうことがあるので、ガラス基板が荒れない酸、濃度を適宜選定する。
次に、CAREの加工原理は、被加工物(マスクブランク用基板)と触媒を処理液中に配置するか、被加工物と触媒との間に処理液を供給し、被加工物と触媒を接触させ、そのときに触媒上に吸着している処理液中の分子から生成された活性種によって被加工物を加工するものである。なお、被加工物がガラスなどの固体酸化物からなる場合には、前記加工原理は、処理液を水とし、水の存在下で被加工物と触媒を接触させ、触媒と被加工物表面とを相対運動させる等することにより、加水分解による分解生成物を被加工物表面から除去し加工するものである。
次に、本発明の一実施形態に係る多層反射膜付き基板20について以下に説明する。図2は、本実施形態の多層反射膜付き基板20を示す断面模式図である。
次に、本発明の一実施形態に係る反射型マスクブランク30について以下に説明する。図3は、本実施形態の反射型マスクブランク30を示す断面模式図である。
次に、本発明の一実施形態に係る反射型マスク40について以下に説明する。図4は、本実施形態の反射型マスク40を示す模式図である。
以上説明した反射型マスク40と、露光装置を使用したリソグラフィープロセスにより、半導体基板等の被転写体上に形成されたレジスト膜に、前記反射型マスク40の吸収体パターン27に基づく回路パターン等の転写パターンを転写し、その他種々の工程を経ることで、半導体基板上に配線など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。
<マスクブランク用基板の作製>
(研磨及びMRFによる表面加工)
マスクブランク用基板として、大きさが152.4mm×152.4mm、厚さが6.35mmのSiO2-TiO2系のガラス基板を準備し、両面研磨装置を用いて、当該ガラス基板の表裏面を、酸化セリウム砥粒及びコロイダルシリカ砥粒により段階的に研磨した後、低濃度のケイフッ酸で表面処理した。これにより得られたガラス基板表面の表面粗さを原子間力顕微鏡で測定したところ、二乗平均平方根粗さ(Rms)は0.15nmであった。
次に、以上のパワースペクトル解析を行ったガラス基板の表裏面について、ガラス基板表面の表面形状を維持又は改善する目的と、中間空間周波数領域粗さを低減することを目的として、ガラス基板の表裏面にEEMを実施した。このEEMは、以下の加工条件で行った。
微細粉末粒子:コロイダルシリカ、平均粒径;約80nm
回転体:ポリウレタン回転球
回転体回転数:280rpm
研磨時間:120分
荷重:1.5kg
次に、以上のEEM表面加工を経たガラス基板の表裏面について、高空間周波数領域粗さを低減することを目的として、ガラス基板の表裏面に対して、触媒基準エッチング(CARE)による表面加工を行った。使用したCARE加工装置の模式図を図7に示す。なお、加工条件は以下の通りとした。
触媒:Pt
基板回転数:10.3回転/分
触媒定磐回転数:10回転/分
加工時間:50分
加工圧:250hPa
検査光源波長193nmの高感度欠陥検査装置(KLA-Tencor社製「Teron600シリーズ」)を使用して、以上のEEM及びCAREによる表面加工処理を経て製造されたマスクブランク用ガラス基板主表面における132mm×132mmの領域を欠陥検査した。検査感度条件は、球相当直径SEVD(Sphere Equivalent Volume Diameter)で20nmサイズの欠陥を検出できる検査感度条件とした。尚、球相当直径SEVDは、欠陥の平面視面積を(S)、欠陥の高さを(h)としたときに、SEVD=2(3S/4πh)1/3の式により算出することができる(以下の実施例、比較例も同様。)。欠陥の面積(S)、欠陥の高さ(h)は原子間力顕微鏡(AFM)により測定することができる。この結果、疑似欠陥を含む欠陥検出数は、合計10,520個であり、従来の欠陥検出数100,000個超と比較して欠陥検出数が大幅に低減された。この程度の欠陥検出数であれば、異物や傷などの致命欠陥の有無を容易に検査することができる。
以上の通りにして得られたマスクブランク用基板の主表面に、イオンビームスパッタリング法により、高屈折率層と低屈折率層とを交互に積層した多層反射膜を形成し、さらにこの多層反射膜上に保護膜を形成して、多層反射膜付き基板を製造した。
上述した多層反射膜付き基板の多層反射膜を形成していない裏面に、DCマグネトロンスパッタリング法により、裏面導電膜を形成した。当該裏面導電膜は、Crターゲットを多層反射膜付き基板の裏面に対向させ、Ar+N2ガス(Ar:N2=90%:10%)雰囲気中で反応性スパッタリングを行うことで形成した。ラザフォード後方散乱分析法により裏面導電膜の元素組成を測定したところ、Cr:90原子%、N:10原子%であった。また、裏面導電膜の膜厚は20nmであった。
上述した吸収体膜の表面に、スピンコート法によりレジストを塗布し、加熱及び冷却工程を経て、膜厚150nmのレジスト膜を成膜した。次いで、所望のパターンの描画及び現像工程を経て、レジストパターンを形成した。
※2:空間周波数:1μm-1以上100μm-1以下
左/右:1μm-1以上10μm-1以下のPSD/10μm-1以上100μm-1以下のPSD
※3:ML:多層反射膜
上述の実施例1において、MRFによる表面加工後、EEM及びCAREの表面加工は行わず、両面タッチ研磨を行った以外は、実施例1と同様にしてマスクブランク用基板及び多層反射膜付き基板を作製した。
※2:空間周波数:1μm-1以上100μm-1以下
左/右:1μm-1以上10μm-1以下のPSD/10μm-1以上100μm-1以下のPSD
※3:ML:多層反射膜
上述の実施例1において、磁気粘弾性流体研磨の加工と、洗浄工程の後、EEMによる表面加工を実施する前にアルカリ性のコロイダルシリカの研磨砥粒(平均粒径:約80nm)を含む研磨液を使用して両面タッチ研磨を行った以外は実施例1と同様にしてマスクブランク用基板及び多層反射膜付き基板を作製した。
※2:空間周波数:1μm-1以上100μm-1以下
左/右:1μm-1以上10μm-1以下のPSD/10μm-1以上100μm-1以下のPSD
※3:ML:多層反射膜
※2:空間周波数:1μm-1以上100μm-1以下
左/右:1μm-1以上10μm-1以下のPSD/10μm-1以上100μm-1以下のPSD
※3:ML:多層反射膜
20 多層反射膜付き基板
21 多層反射膜
22 保護膜
23 裏面導電膜
24 吸収体膜
27 吸収体パターン
30 反射型マスクブランク
40 反射型マスク
100 CARE(触媒基準エッチング)加工装置
124 処理槽
126 触媒定盤
128 ガラス基板(被加工物)
130 基板ホルダ
132 回転軸
140 基材
142 白金(触媒)
170 ヒータ
172 熱交換器
174 処理液供給ノズル
176 流体流路
Claims (23)
- リソグラフィーに使用されるマスクブランク用基板であって、
該マスクブランク用基板の転写パターンが形成される側の主表面における0.14mm×0.1mmの領域を白色干渉計にて、ピクセル数640×480で測定して得られる空間周波数1×10-2μm-1以上1μm-1以下におけるパワースペクトル密度が4×106nm4以下であり、前記主表面における1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上におけるパワースペクトル密度が10nm4以下である、マスクブランク用基板。 - 前記主表面の1μm×1μmの領域を原子間力顕微鏡で測定して得られる二乗平均平方根粗さ(Rms)が0.13nm未満であることを特徴とする請求項1に記載のマスクブランク用基板。
- 前記主表面の1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上10μm-1以下におけるパワースペクトル密度が1nm4以上10nm4以下であることを特徴とする請求項1又は2に記載のマスクブランク用基板。
- 前記基板が、EUVリソグラフィーに使用されるマスクブランク用基板であることを特徴とする請求項1~3のいずれか1項に記載のマスクブランク用基板。
- 請求項1~4のいずれか1項に記載のマスクブランク用基板の前記主表面上に、高屈折率層と低屈折率層とを交互に積層した多層反射膜を有することを特徴とする多層反射膜付き基板。
- 前記多層反射膜上に保護膜を有することを特徴とする請求項5に記載の多層反射膜付き基板。
- リソグラフィーに使用されるマスクブランク用基板の主表面上に、高屈折率層と低屈折率層とを交互に積層した多層反射膜を有する多層反射膜付き基板であって、
前記多層反射膜が形成されている側の前記多層反射膜付き基板表面における0.14mm×0.1mmの領域を白色干渉計にて、ピクセル数640×480で測定して得られる空間周波数1×10-2μm-1以上1μm-1以下におけるパワースペクトル密度が4×107nm4以下であり、前記多層反射膜付き基板表面における1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上100μm-1以下におけるパワースペクトル密度が20nm4以下であることを特徴とする多層反射膜付き基板。 - 前記多層反射膜付き基板表面の1μm×1μmの領域を原子間力顕微鏡で測定して得られる二乗平均平方根粗さ(Rms)が0.13nm未満であることを特徴とする請求項7に記載の多層反射膜付き基板。
- 前記多層反射膜上に保護膜を有することを特徴とする請求項7又は8に記載の多層反射膜付き基板。
- 請求項5~9のいずれか1項に記載の多層反射膜付き基板の前記多層反射膜又は保護膜上に、転写パターンとなる吸収体膜を有することを特徴とする反射型マスクブランク。
- 請求項10に記載の反射型マスクブランクにおける前記吸収体膜がパターニングされてなる吸収体パターンを、前記多層反射膜又は保護膜上に有することを特徴とする反射型マスク。
- リソグラフィーに使用されるマスクブランク用基板の転写パターンが形成される側の主表面を、所定の表面形態が得られるように表面加工する表面加工工程を有するマスクブランク用基板の製造方法であって、
前記表面加工工程は、前記主表面における0.14mm×0.1mmの領域を、白色干渉計にて、ピクセル数640×480で測定して得られる空間周波数1×10-2μm-1以上1μm-1以下におけるパワースペクトル密度が4×106nm4以下となり、かつ前記主表面における1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上におけるパワースペクトル密度が10nm4以下となるように表面加工する工程であることを特徴とするマスクブランク用基板の製造方法。 - 前記表面加工工程は、前記主表面における0.14mm×0.1mmの領域を、白色干渉計にて、ピクセル数640×480で測定して得られる空間周波数1×10-2μm-1以上1μm-1以下におけるパワースペクトル密度が4×106nm4以下となるように表面加工する中間空間周波数領域粗さ低減工程と、前記主表面における1μm×1μmの領域を原子間力顕微鏡で測定して得られる空間周波数1μm-1以上におけるパワースペクトル密度が10nm4以下となるように表面加工する高空間周波数領域粗さ低減工程とを有することを特徴とする請求項12に記載のマスクブランク用基板の製造方法。
- 前記中間空間周波数領域粗さ低減工程の後に、前記高空間周波数領域粗さ低減工程を行うことを特徴とする請求項13に記載のマスクブランク用基板の製造方法。
- 前記表面加工工程は、EEM(Elastic Emission Machining)及び/又は触媒基準エッチング:CARE(CAtalyst-Referred Etching)にて実施されることを特徴とする請求項12~14のいずれか1項に記載のマスクブランク用基板の製造方法。
- 前記中間空間周波数領域粗さ低減工程は、EEMにて前記主表面を表面加工することにより実施されることを特徴とする請求項13又は14に記載のマスクブランク用基板の製造方法。
- 前記高空間周波数領域粗さ低減工程は、触媒基準エッチングにて前記主表面を表面加工することにより実施されることを特徴とする請求項13~16のいずれか1項に記載のマスクブランク用基板の製造方法。
- 前記基板が、EUVリソグラフィーに使用されるマスクブランク用基板であることを特徴とする請求項12~17のいずれか1項に記載のマスクブランク用基板の製造方法。
- 請求項1~4のいずれか1項に記載のマスクブランク用基板又は請求項12~18のいずれか1項に記載の製造方法により製造されたマスクブランク用基板の前記主表面上に、高屈折率層と低屈折率層とを交互に積層した多層反射膜を形成する多層反射膜形成工程を有することを特徴とする多層反射膜付き基板の製造方法。
- 前記多層反射膜形成工程は、イオンビームスパッタリング法により前記高屈折率層及び低屈折率層を交互に成膜することにより実施されることを特徴とする請求項19に記載の多層反射膜付き基板の製造方法。
- 前記多層反射膜形成工程では、高屈折率材料と低屈折率材料のターゲットを用いたイオンビームスパッタリングにより、前記高屈折率材料と前記低屈折率材料のスパッタ粒子を前記主表面の法線に対して0度以上30度以下の入射角度で交互に入射させて前記多層反射膜を形成することを特徴とする請求項20に記載の多層反射膜付き基板の製造方法。
- 前記多層反射膜上に保護膜を形成する工程をさらに有することを特徴とする請求項19~21のいずれか1項に記載の多層反射膜付き基板の製造方法。
- 請求項11に記載の反射型マスクを用いて、露光装置を使用したリソグラフィープロセスを行い、被転写体上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。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020177029863A KR101995879B1 (ko) | 2012-12-28 | 2013-12-27 | 마스크 블랭크용 기판, 다층 반사막 부착 기판, 반사형 마스크 블랭크, 반사형 마스크 및 반도체 장치의 제조방법 |
KR1020157020360A KR101878164B1 (ko) | 2012-12-28 | 2013-12-27 | 마스크 블랭크용 기판, 다층 반사막 부착 기판, 반사형 마스크 블랭크, 반사형 마스크, 마스크 블랭크용 기판의 제조방법 및 다층 반사막 부착 기판의 제조방법, 그리고 반도체 장치의 제조방법 |
JP2014539933A JP5712336B2 (ja) | 2012-12-28 | 2013-12-27 | マスクブランク用基板、多層反射膜付き基板、反射型マスクブランク、反射型マスク、マスクブランク用基板の製造方法及び多層反射膜付き基板の製造方法並びに半導体装置の製造方法 |
SG11201505056WA SG11201505056WA (en) | 2012-12-28 | 2013-12-27 | Substrate for mask blank, substrate with multilayer reflective film, reflective mask blank, reflective mask, method of manufacturing for substrate for mask blank, method of manufacturing for substrate with multilayer reflective film, and method of manufacturing semiconductor device |
US14/655,190 US9581895B2 (en) | 2012-12-28 | 2013-12-27 | Mask blank substrate, substrate with multilayer reflective film, reflective mask blank, reflective mask, method of manufacturing mask blank substrate, method of manufacturing substrate with reflective film and method of manufacturing semiconductor device |
US15/417,846 US10025176B2 (en) | 2012-12-28 | 2017-01-27 | Mask blank substrate, substrate with multilayer reflective film, reflective mask blank, reflective mask, method of manufacturing mask blank substrate, method of manufacturing substrate with reflective film and method of manufacturing semiconductor device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012287376 | 2012-12-28 | ||
JP2012-287376 | 2012-12-28 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/655,190 A-371-Of-International US9581895B2 (en) | 2012-12-28 | 2013-12-27 | Mask blank substrate, substrate with multilayer reflective film, reflective mask blank, reflective mask, method of manufacturing mask blank substrate, method of manufacturing substrate with reflective film and method of manufacturing semiconductor device |
US15/417,846 Continuation US10025176B2 (en) | 2012-12-28 | 2017-01-27 | Mask blank substrate, substrate with multilayer reflective film, reflective mask blank, reflective mask, method of manufacturing mask blank substrate, method of manufacturing substrate with reflective film and method of manufacturing semiconductor device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014104276A1 true WO2014104276A1 (ja) | 2014-07-03 |
Family
ID=51021347
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/085049 WO2014104276A1 (ja) | 2012-12-28 | 2013-12-27 | マスクブランク用基板、多層反射膜付き基板、反射型マスクブランク、反射型マスク、マスクブランク用基板の製造方法及び多層反射膜付き基板の製造方法並びに半導体装置の製造方法 |
Country Status (6)
Country | Link |
---|---|
US (2) | US9581895B2 (ja) |
JP (2) | JP5712336B2 (ja) |
KR (2) | KR101995879B1 (ja) |
SG (2) | SG10201605473TA (ja) |
TW (2) | TWI652541B (ja) |
WO (1) | WO2014104276A1 (ja) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016069553A (ja) * | 2014-09-30 | 2016-05-09 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
JP2016113356A (ja) * | 2014-12-12 | 2016-06-23 | 旭硝子株式会社 | 予備研磨されたガラス基板表面を仕上げ加工する方法 |
WO2016104239A1 (ja) * | 2014-12-24 | 2016-06-30 | Hoya株式会社 | 反射型マスクブランク、反射型マスク及び半導体装置の製造方法 |
JP2016143791A (ja) * | 2015-02-03 | 2016-08-08 | 旭硝子株式会社 | マスクブランク用ガラス基板 |
JP2019155232A (ja) * | 2018-03-08 | 2019-09-19 | 株式会社ジェイテックコーポレーション | 洗浄方法及び洗浄装置 |
JP2020074053A (ja) * | 2015-02-16 | 2020-05-14 | 大日本印刷株式会社 | フォトマスク、フォトマスクブランクス、およびフォトマスクの製造方法 |
EP3923071A1 (en) | 2020-06-09 | 2021-12-15 | Shin-Etsu Chemical Co., Ltd. | Mask blank glass substrate |
KR20220133122A (ko) | 2021-03-24 | 2022-10-04 | 호야 가부시키가이샤 | 다층 반사막 구비 기판의 제조 방법, 반사형 마스크 블랭크 및 그 제조 방법, 그리고 반사형 마스크의 제조 방법 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180086457A (ko) | 2015-11-27 | 2018-07-31 | 호야 가부시키가이샤 | 마스크 블랭크용 기판, 다층 반사막을 구비한 기판, 반사형 마스크 블랭크 및 반사형 마스크, 및 반도체 장치의 제조 방법 |
JP6541557B2 (ja) * | 2015-11-27 | 2019-07-10 | Hoya株式会社 | 欠陥評価方法、マスクブランクの製造方法、マスクブランク、マスクブランク用基板の製造方法、マスクブランク用基板、転写用マスクの製造方法および半導体デバイスの製造方法 |
JP6582971B2 (ja) * | 2015-12-25 | 2019-10-02 | Agc株式会社 | マスクブランク用の基板、およびその製造方法 |
JP6873758B2 (ja) * | 2016-03-28 | 2021-05-19 | Hoya株式会社 | 基板の製造方法、多層反射膜付き基板の製造方法、マスクブランクの製造方法、及び転写用マスクの製造方法 |
JP6739960B2 (ja) * | 2016-03-28 | 2020-08-12 | Hoya株式会社 | 反射型マスクブランク、反射型マスク及び半導体装置の製造方法 |
KR102393311B1 (ko) * | 2016-03-31 | 2022-05-02 | 호야 가부시키가이샤 | 반사형 마스크 블랭크의 제조 방법, 반사형 마스크 블랭크, 반사형 마스크의 제조 방법, 반사형 마스크, 및 반도체 장치의 제조 방법 |
US9870612B2 (en) * | 2016-06-06 | 2018-01-16 | Taiwan Semiconductor Manufacturing Co., Ltd. | Method for repairing a mask |
JP6717211B2 (ja) * | 2017-01-16 | 2020-07-01 | Agc株式会社 | マスクブランク用基板、マスクブランク、およびフォトマスク |
JP7039248B2 (ja) * | 2017-10-20 | 2022-03-22 | 株式会社Vtsタッチセンサー | 導電性フィルム、タッチパネル、および、表示装置 |
KR102374206B1 (ko) | 2017-12-05 | 2022-03-14 | 삼성전자주식회사 | 반도체 장치 제조 방법 |
US11442021B2 (en) * | 2019-10-11 | 2022-09-13 | Kla Corporation | Broadband light interferometry for focal-map generation in photomask inspection |
JP7318565B2 (ja) | 2020-03-03 | 2023-08-01 | 信越化学工業株式会社 | 反射型マスクブランクの製造方法 |
US11422096B2 (en) | 2020-11-30 | 2022-08-23 | Applied Materials, Inc. | Surface topography measurement apparatus and method |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003505876A (ja) * | 1999-07-22 | 2003-02-12 | コーニング インコーポレイテッド | 遠紫外軟x線投影リソグラフィー法システムおよびリソグラフィーエレメント |
JP2006226733A (ja) * | 2005-02-15 | 2006-08-31 | Canon Inc | 軟x線多層膜反射鏡の形成方法 |
JP2006278515A (ja) * | 2005-03-28 | 2006-10-12 | Shin Etsu Handotai Co Ltd | 半導体ウエーハの評価方法及び製造方法 |
JP2007283410A (ja) * | 2006-04-12 | 2007-11-01 | Kumamoto Univ | 触媒支援型化学加工方法 |
JP2008094649A (ja) * | 2006-10-10 | 2008-04-24 | Shinetsu Quartz Prod Co Ltd | 石英ガラス基板の表面処理方法及び水素ラジカルエッチング装置 |
JP2008156215A (ja) * | 2006-12-01 | 2008-07-10 | Asahi Glass Co Ltd | 予備研磨されたガラス基板表面を仕上げ加工する方法 |
JP2009117782A (ja) * | 2007-10-15 | 2009-05-28 | Ebara Corp | 平坦化方法及び平坦化装置 |
WO2013146990A1 (ja) * | 2012-03-28 | 2013-10-03 | Hoya株式会社 | マスクブランク用基板、多層反射膜付き基板、透過型マスクブランク、反射型マスクブランク、透過型マスク、反射型マスク及び半導体装置の製造方法 |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4219718B2 (ja) | 2003-03-28 | 2009-02-04 | Hoya株式会社 | Euvマスクブランクス用ガラス基板の製造方法及びeuvマスクブランクスの製造方法 |
DE102004008824B4 (de) * | 2004-02-20 | 2006-05-04 | Schott Ag | Glaskeramik mit geringer Wärmeausdehnung sowie deren Verwendung |
JP5090633B2 (ja) | 2004-06-22 | 2012-12-05 | 旭硝子株式会社 | ガラス基板の研磨方法 |
JP4506399B2 (ja) | 2004-10-13 | 2010-07-21 | 株式会社荏原製作所 | 触媒支援型化学加工方法 |
US7199863B2 (en) * | 2004-12-21 | 2007-04-03 | Asml Netherlands B.V. | Method of imaging using lithographic projection apparatus |
JP2006194764A (ja) * | 2005-01-14 | 2006-07-27 | Nikon Corp | 多層膜反射鏡および露光装置 |
US7601466B2 (en) * | 2005-02-09 | 2009-10-13 | Taiwan Semiconductor Manufacturing Company, Ltd. | System and method for photolithography in semiconductor manufacturing |
JP4652946B2 (ja) * | 2005-10-19 | 2011-03-16 | Hoya株式会社 | 反射型マスクブランク用基板の製造方法、反射型マスクブランクの製造方法、及び反射型マスクの製造方法 |
US20080132150A1 (en) * | 2006-11-30 | 2008-06-05 | Gregory John Arserio | Polishing method for extreme ultraviolet optical elements and elements produced using the method |
JP5111954B2 (ja) * | 2007-06-22 | 2013-01-09 | 新光電気工業株式会社 | 静電チャック及びその製造方法 |
US8734661B2 (en) | 2007-10-15 | 2014-05-27 | Ebara Corporation | Flattening method and flattening apparatus |
JP5369506B2 (ja) | 2008-06-11 | 2013-12-18 | 信越化学工業株式会社 | 合成石英ガラス基板用研磨剤 |
EP2333816A4 (en) * | 2008-09-05 | 2014-01-22 | Asahi Glass Co Ltd | REFLECTING MASK ROLLING FOR EUV LITHOGRAPHY AND METHOD OF MANUFACTURING THEREOF |
EP2434345B1 (en) * | 2010-09-27 | 2013-07-03 | Imec | Method and system for evaluating euv mask flatness |
JP5196507B2 (ja) * | 2011-01-05 | 2013-05-15 | Hoya株式会社 | 反射型マスクブランク、反射型マスク及び多層膜反射鏡 |
JP5858623B2 (ja) * | 2011-02-10 | 2016-02-10 | 信越化学工業株式会社 | 金型用基板 |
KR101904560B1 (ko) * | 2011-03-07 | 2018-10-04 | 에이지씨 가부시키가이샤 | 다층 기판, 다층 기판의 제조 방법, 다층 기판의 품질 관리 방법 |
JP2012159855A (ja) * | 2012-04-23 | 2012-08-23 | Hoya Corp | マスクブランクの製造方法及びマスクの製造方法 |
-
2013
- 2013-12-27 TW TW107111424A patent/TWI652541B/zh active
- 2013-12-27 TW TW102148848A patent/TWI625592B/zh active
- 2013-12-27 SG SG10201605473TA patent/SG10201605473TA/en unknown
- 2013-12-27 SG SG11201505056WA patent/SG11201505056WA/en unknown
- 2013-12-27 JP JP2014539933A patent/JP5712336B2/ja active Active
- 2013-12-27 KR KR1020177029863A patent/KR101995879B1/ko active IP Right Grant
- 2013-12-27 KR KR1020157020360A patent/KR101878164B1/ko active IP Right Grant
- 2013-12-27 WO PCT/JP2013/085049 patent/WO2014104276A1/ja active Application Filing
- 2013-12-27 US US14/655,190 patent/US9581895B2/en active Active
-
2015
- 2015-03-09 JP JP2015045754A patent/JP6262165B2/ja active Active
-
2017
- 2017-01-27 US US15/417,846 patent/US10025176B2/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003505876A (ja) * | 1999-07-22 | 2003-02-12 | コーニング インコーポレイテッド | 遠紫外軟x線投影リソグラフィー法システムおよびリソグラフィーエレメント |
JP2006226733A (ja) * | 2005-02-15 | 2006-08-31 | Canon Inc | 軟x線多層膜反射鏡の形成方法 |
JP2006278515A (ja) * | 2005-03-28 | 2006-10-12 | Shin Etsu Handotai Co Ltd | 半導体ウエーハの評価方法及び製造方法 |
JP2007283410A (ja) * | 2006-04-12 | 2007-11-01 | Kumamoto Univ | 触媒支援型化学加工方法 |
JP2008094649A (ja) * | 2006-10-10 | 2008-04-24 | Shinetsu Quartz Prod Co Ltd | 石英ガラス基板の表面処理方法及び水素ラジカルエッチング装置 |
JP2008156215A (ja) * | 2006-12-01 | 2008-07-10 | Asahi Glass Co Ltd | 予備研磨されたガラス基板表面を仕上げ加工する方法 |
JP2009117782A (ja) * | 2007-10-15 | 2009-05-28 | Ebara Corp | 平坦化方法及び平坦化装置 |
WO2013146990A1 (ja) * | 2012-03-28 | 2013-10-03 | Hoya株式会社 | マスクブランク用基板、多層反射膜付き基板、透過型マスクブランク、反射型マスクブランク、透過型マスク、反射型マスク及び半導体装置の製造方法 |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016069553A (ja) * | 2014-09-30 | 2016-05-09 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
JP2016113356A (ja) * | 2014-12-12 | 2016-06-23 | 旭硝子株式会社 | 予備研磨されたガラス基板表面を仕上げ加工する方法 |
US10642149B2 (en) | 2014-12-24 | 2020-05-05 | Hoya Corporation | Reflective mask blank, reflective mask and method of manufacturing semiconductor device |
KR102545187B1 (ko) | 2014-12-24 | 2023-06-19 | 호야 가부시키가이샤 | 반사형 마스크 블랭크, 반사형 마스크 및 반도체 장치의 제조방법 |
KR20170096027A (ko) * | 2014-12-24 | 2017-08-23 | 호야 가부시키가이샤 | 반사형 마스크 블랭크, 반사형 마스크 및 반도체 장치의 제조방법 |
US20180329285A1 (en) * | 2014-12-24 | 2018-11-15 | Hoya Corporation | Reflective mask blank, reflective mask and method of manufacturing semiconductor device |
US10394113B2 (en) | 2014-12-24 | 2019-08-27 | Hoya Corporation | Reflective mask blank, reflective mask and method of manufacturing semiconductor device |
KR102561655B1 (ko) * | 2014-12-24 | 2023-07-31 | 호야 가부시키가이샤 | 반사형 마스크 블랑크, 반사형 마스크, 및 반도체 장치의 제조 방법 |
WO2016104239A1 (ja) * | 2014-12-24 | 2016-06-30 | Hoya株式会社 | 反射型マスクブランク、反射型マスク及び半導体装置の製造方法 |
KR20230096126A (ko) * | 2014-12-24 | 2023-06-29 | 호야 가부시키가이샤 | 반사형 마스크 블랑크, 반사형 마스크, 및 반도체 장치의 제조 방법 |
JP2016143791A (ja) * | 2015-02-03 | 2016-08-08 | 旭硝子株式会社 | マスクブランク用ガラス基板 |
JP2020074053A (ja) * | 2015-02-16 | 2020-05-14 | 大日本印刷株式会社 | フォトマスク、フォトマスクブランクス、およびフォトマスクの製造方法 |
JP2019155232A (ja) * | 2018-03-08 | 2019-09-19 | 株式会社ジェイテックコーポレーション | 洗浄方法及び洗浄装置 |
KR20210152951A (ko) | 2020-06-09 | 2021-12-16 | 신에쓰 가가꾸 고교 가부시끼가이샤 | 마스크 블랭크스용 유리 기판 |
EP3923071A1 (en) | 2020-06-09 | 2021-12-15 | Shin-Etsu Chemical Co., Ltd. | Mask blank glass substrate |
US11835853B2 (en) | 2020-06-09 | 2023-12-05 | Shin-Etsu Chemical Co., Ltd. | Mask blank glass substrate |
KR20220133122A (ko) | 2021-03-24 | 2022-10-04 | 호야 가부시키가이샤 | 다층 반사막 구비 기판의 제조 방법, 반사형 마스크 블랭크 및 그 제조 방법, 그리고 반사형 마스크의 제조 방법 |
Also Published As
Publication number | Publication date |
---|---|
TW201823850A (zh) | 2018-07-01 |
KR101995879B1 (ko) | 2019-07-03 |
TWI652541B (zh) | 2019-03-01 |
KR20170118981A (ko) | 2017-10-25 |
JP6262165B2 (ja) | 2018-01-17 |
TW201432369A (zh) | 2014-08-16 |
SG10201605473TA (en) | 2016-09-29 |
SG11201505056WA (en) | 2015-08-28 |
JP5712336B2 (ja) | 2015-05-07 |
US20150331312A1 (en) | 2015-11-19 |
JPWO2014104276A1 (ja) | 2017-01-19 |
KR101878164B1 (ko) | 2018-07-13 |
JP2015148807A (ja) | 2015-08-20 |
KR20150103142A (ko) | 2015-09-09 |
US9581895B2 (en) | 2017-02-28 |
TWI625592B (zh) | 2018-06-01 |
US10025176B2 (en) | 2018-07-17 |
US20170131629A1 (en) | 2017-05-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6262165B2 (ja) | マスクブランク用基板、多層反射膜付き基板、反射型マスクブランク、反射型マスク及び半導体装置の製造方法 | |
JP6515235B2 (ja) | マスクブランク用基板、多層反射膜付き基板、反射型マスクブランク、反射型マスク及び半導体装置の製造方法 | |
JP6195880B2 (ja) | マスクブランク用基板の製造方法、多層反射膜付き基板の製造方法、反射型マスクブランクの製造方法、反射型マスクの製造方法、透過型マスクブランクの製造方法、透過型マスクの製造方法、及び半導体装置の製造方法 | |
JP6388841B2 (ja) | 反射型マスクブランク、反射型マスクブランクの製造方法、反射型マスク及び半導体装置の製造方法 | |
TWI626503B (zh) | 附導電膜之基板、附多層反射膜之基板、反射型光罩基底及反射型光罩、與半導體裝置之製造方法 | |
JP6279476B2 (ja) | 多層反射膜付き基板の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2014539933 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13867778 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14655190 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20157020360 Country of ref document: KR Kind code of ref document: A |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 13867778 Country of ref document: EP Kind code of ref document: A1 |