WO2022153657A1 - 反射型フォトマスクブランク及び反射型フォトマスク - Google Patents
反射型フォトマスクブランク及び反射型フォトマスク Download PDFInfo
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- WO2022153657A1 WO2022153657A1 PCT/JP2021/041787 JP2021041787W WO2022153657A1 WO 2022153657 A1 WO2022153657 A1 WO 2022153657A1 JP 2021041787 W JP2021041787 W JP 2021041787W WO 2022153657 A1 WO2022153657 A1 WO 2022153657A1
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- Prior art keywords
- layer
- reflective
- reflective photomask
- absorption
- absorption layer
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 134
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 92
- 229910052738 indium Inorganic materials 0.000 claims abstract description 47
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 46
- 239000000758 substrate Substances 0.000 claims abstract description 30
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 21
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 19
- 239000010936 titanium Substances 0.000 claims description 13
- 230000002745 absorbent Effects 0.000 claims description 12
- 239000002250 absorbent Substances 0.000 claims description 12
- 239000011651 chromium Substances 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims description 10
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 9
- 239000011733 molybdenum Substances 0.000 claims description 9
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 229910052715 tantalum Inorganic materials 0.000 claims description 9
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 229910052731 fluorine Inorganic materials 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 229910052697 platinum Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 229910052714 tellurium Inorganic materials 0.000 claims description 8
- 229910052718 tin Inorganic materials 0.000 claims description 8
- 229910052721 tungsten Inorganic materials 0.000 claims description 8
- 229910052796 boron Inorganic materials 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910052735 hafnium Inorganic materials 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052763 palladium Inorganic materials 0.000 claims description 5
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 4
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 229910052733 gallium Inorganic materials 0.000 claims description 4
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 4
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims 4
- 230000000694 effects Effects 0.000 abstract description 12
- 238000000059 patterning Methods 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 217
- 230000000052 comparative effect Effects 0.000 description 55
- 239000000463 material Substances 0.000 description 22
- 230000003287 optical effect Effects 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000004065 semiconductor Substances 0.000 description 9
- 230000008033 biological extinction Effects 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 6
- 230000031700 light absorption Effects 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 4
- 238000001312 dry etching Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000001900 extreme ultraviolet lithography Methods 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 229910052726 zirconium Inorganic materials 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 229910052707 ruthenium Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- PSCMQHVBLHHWTO-UHFFFAOYSA-K indium(iii) chloride Chemical compound Cl[In](Cl)Cl PSCMQHVBLHHWTO-UHFFFAOYSA-K 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 description 1
- NWAIGJYBQQYSPW-UHFFFAOYSA-N azanylidyneindigane Chemical compound [In]#N NWAIGJYBQQYSPW-UHFFFAOYSA-N 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000005546 reactive sputtering Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/22—Masks or mask blanks for imaging by radiation of 100nm or shorter wavelength, e.g. X-ray masks, extreme ultraviolet [EUV] masks; Preparation thereof
- G03F1/24—Reflection masks; Preparation thereof
-
- 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
- G03F1/54—Absorbers, e.g. of opaque materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
Definitions
- the present invention relates to a reflective photomask used in lithography using light in the ultraviolet region as a light source and a reflective photomask blank for producing the same.
- the exposure light source has replaced the conventional ArF excimer laser light having a wavelength of 193 nm with light in the EUV (Extreme Ultra Violet) region having a wavelength of 13.5 nm.
- Patent Document 1 Since light in the EUV region is absorbed at a high rate by most substances, a reflective photomask is used as a photomask for EUV exposure (for example, see Patent Document 1).
- a reflective layer made of a multilayer reflective film in which molybdenum (Mo) layers and silicon (Si) layers are alternately laminated is formed on a glass substrate, and tantalum (Ta) is used as a main component on the reflective layer.
- An EUV photomask obtained by forming a light absorbing layer and forming a mask pattern on the light absorbing layer is disclosed.
- the optical system member of the exposure machine is not a lens but a reflection type (mirror). For this reason, there is a problem that the incident light and the reflected light on the reflective photomask (EUV mask) cannot be designed coaxially.
- EUV mask reflective photomask
- the optical axis is tilted 6 degrees from the vertical direction of the EUV photomask and incident.
- a method of guiding the reflected light reflected at an angle of -6 degrees to the semiconductor substrate is adopted.
- a film mainly composed of tantalum (Ta) having a layer thickness of 60 to 90 nm is used as a light absorption layer.
- Ta tantalum
- the contrast may decrease at the edge portion that is the shadow of the mask pattern, depending on the relationship between the incident direction of EUV light and the direction of the mask pattern. May cause.
- problems such as an increase in line edge roughness of the transfer pattern on the semiconductor substrate and the inability to form the line width to the target size may occur, and the transfer performance may deteriorate.
- the present invention can suppress or reduce the projection effect of a reflective photomask for patterning transfer using light having a wavelength in the extreme ultraviolet region as a light source, and has sufficient thermal resistance during exposure, a reflective photomask blank and a reflective photo.
- the purpose is to provide a mask.
- the reflective photomask blank is a reflective photomask blank for producing a reflective photomask for pattern transfer using extreme ultraviolet rays as a light source. It has a substrate, a reflective layer including a multilayer film formed on the substrate, and an absorbent layer formed on the reflective layer, and the absorbent layer is a total of indium (In) and nitrogen (N). It contains 50 atomic% or more, the atomic number ratio (N / In) of nitrogen (N) to indium (In) in the absorption layer is 0.5 or more and 1.5 or less, and the layer thickness of the absorption layer is 17 nm or more. It is characterized by having a thickness of 45 nm or less.
- the absorbent layer is tantalum (Ta), platinum (Pt), tellurium (Te), zirconium (Zr), hafnium (Hf), titanium (Ti), tungsten (W), silicon (Si), chromium (Cr). , Gallium (Ga), Molybdenum (Mo), Tin (Sn), Platinum (Pd), Nickel (Ni), Boron (B), Fluorine (F), Oxygen (O), Carbon (C) and Hydrogen (H) It may further contain one or more elements selected from the group consisting of.
- the reflective photomask is a reflective photomask for pattern transfer using extreme ultraviolet rays as a light source, and includes a substrate, a reflective layer containing a multilayer film formed on the substrate, and a reflective layer. It has an absorption pattern layer formed on the reflection layer, and the absorption pattern layer contains 50 atomic% or more of indium (In) and nitrogen (N) in total, and the indium (In) in the absorption pattern layer.
- the atomic number ratio (N / In) of nitrogen (N) to water is 0.5 or more and 1.5 or less, and the layer thickness of the absorption pattern layer is 17 nm or more and 45 nm or less.
- the absorption pattern layer includes tantalum (Ta), platinum (Pt), tellurium (Te), zirconium (Zr), hafnium (Hf), titanium (Ti), tungsten (W), silicon (Si), and chromium (Cr). ), Gallium (Ga), Molybdenum (Mo), Tin (Sn), Platinum (Pd), Nickel (Ni), Boron (B), Fluorine (F), Oxygen (O), Carbon (C) and Hydrogen (H) ) May further contain one or more elements selected from the group.
- a reflective photomask having improved transfer performance to a semiconductor substrate and heat resistance during exposure can be expected in patterning using light having a wavelength in the extreme ultraviolet region as a light source. That is, the reflective photomask blank and the reflective photomask according to one aspect of the present invention suppress or reduce the projection effect of the reflective photomask for patterning transfer using light having a wavelength in the extreme ultraviolet region as a light source. Moreover, it has sufficient resistance to EUV light irradiation.
- FIG. 1 is a schematic cross-sectional view showing the structure of the reflective photomask blank 10 according to the embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view showing the structure of the reflective photomask 20 according to the embodiment of the present invention.
- the reflective photomask 20 according to the embodiment of the present invention shown in FIG. 2 is formed by patterning the absorption layer 4 of the reflective photomask blank 10 according to the embodiment of the present invention shown in FIG. be.
- the reflective photomask blank 10 includes a substrate 1, a reflective layer 2 formed on the substrate 1, and a capping layer 3 formed on the reflective layer 2. And an absorption layer 4 formed on the capping layer 3.
- substrate for the substrate 1 according to the embodiment of the present invention, for example, a flat Si substrate, a synthetic quartz substrate, or the like can be used. Further, although low thermal expansion glass to which titanium is added can be used for the substrate 1, the present invention is not limited to these as long as it is a material having a small coefficient of thermal expansion.
- the reflective layer 2 may be any one that reflects EUV light (extreme ultraviolet light) as exposure light, and is a multilayer reflective film made of a combination of materials having a significantly different refractive index with respect to EUV light. May be good.
- the reflective layer 2 including the multilayer reflective film is formed by repeatedly laminating layers of a combination of Mo (molybdenum) and Si (silicon) or Mo (molybdenum) and Be (beryllium) for about 40 cycles, for example. You may.
- the capping layer 3 is formed of a material having resistance to dry etching performed when forming a transfer pattern (mask pattern) on the absorption layer 4, and etches the absorption layer 4. At that time, it functions as an etching stopper to prevent damage to the reflective layer 2.
- the capping layer 3 is made of, for example, Ru (ruthenium).
- the capping layer 3 may not be formed depending on the material of the reflective layer 2 and the etching conditions.
- a back surface conductive film can be formed on the surface of the substrate 1 on which the reflective layer 2 is not formed.
- the back surface conductive film is a film for fixing the reflective photomask 20 by using the principle of an electrostatic chuck when it is installed in an exposure machine.
- the absorption pattern (absorption pattern layer) 41 of the reflection type photomask 20 Is formed.
- EUV lithography EUV light is obliquely incident and reflected by the reflection layer 2, but the transfer performance on the wafer (semiconductor substrate) may deteriorate due to the projection effect that the absorption pattern layer 41 obstructs the optical path. be. This deterioration in transfer performance is reduced by reducing the thickness of the absorption layer 4 that absorbs EUV light.
- FIG. 3 is a graph showing the optical constants of EUV light of each metal material with respect to a wavelength of 13.5 nm.
- the horizontal axis of FIG. 3 represents the refractive index n, and the vertical axis represents the extinction coefficient k.
- the extinction coefficient k of tantalum (Ta), which is the main material of the conventional absorption layer 4, is 0.041. If the compound material has an extinction coefficient k larger than that, the thickness of the absorption layer 4 can be reduced as compared with the conventional one. When the extinction coefficient k is 0.06 or more, the thickness of the absorption layer 4 can be made sufficiently thin, and the projection effect can be reduced.
- nk value for example, silver (Ag), platinum (Pt), indium (In), cobalt (Co), tin (Sn), as shown in FIG.
- Ni nickel
- Te tellurium
- these metal materials have a problem that the volatility of the elemental halide is low and the dry etching property is poor. Therefore, even if a reflective photomask blank having an absorbent layer formed of these metal materials is produced, the absorbent layer pattern cannot be patterned on the absorbent layer, and as a result, the reflective photomask blank is made reflective. There is a problem that the photomask cannot be processed. Alternatively, since the melting points of these metal materials are low, they cannot withstand the heat during the production of the reflective photomask or during EUV exposure, resulting in a problem that the reflective photomask is not practical.
- the reflective photomask blank and the absorbent layer of the reflective photomask of the present invention have InN, which is an indium nitride.
- the melting point is around 157 ° C., which is lower than the heat temperature at the time of producing a reflective photomask or EUV exposure, and there is a problem in thermal stability.
- the melting point of the oxide InO film is sufficiently high at 800 ° C. or higher, but it can be increased to 1100 ° C. or higher by using nitride.
- the InN film has sufficient resistance to heat during the production of a reflective photomask and during EUV exposure.
- the InN film is chemically stable, it can be dry-etched using a chlorine-based gas, so that the reflective photomask blank can be processed into a reflective photomask.
- InCl3 which is a compound of In and chlorine (Cl)
- the volatility of InCl3 is higher than that of the highly absorbent material other than In shown in FIG.
- the material containing indium (In) and nitrogen (N) for forming the absorption layer 4 has an atomic number ratio (N / In) of nitrogen (N) to indium (In) of 0.5 or more and 1.5 or less. It is preferable to have.
- the atomic number ratio of indium (In) and nitrogen (N) in the material constituting the absorption layer 4 is 0.5 or more, sufficient heat resistance can be imparted. Since it was confirmed that a film in which the atomic number ratio of nitrogen (N) to indium (In) exceeded 1.5 could not be formed, this was set as the upper limit.
- the atomic number ratio (N / In) is stoichiometrically stable when it is 1.0, it is more preferably in the range of 0.7 or more and 1.2 or less, and 0.8 or more and 1.0. The following range is more preferable.
- the material constituting the absorption layer 4 preferably contains indium (In) and nitrogen (N) in a total amount of 50 atomic% or more. This is because if the absorption layer 4 contains components other than indium (In) and nitrogen (N), both EUV light absorption and heat resistance may decrease, but indium (In) and nitrogen (In) and nitrogen ( This is because if the components other than N) are less than 50 atomic%, the EUV light absorption and heat resistance are slightly deteriorated, and the performance of the EUV mask as the absorption layer 4 is hardly deteriorated.
- Materials other than indium (In) and nitrogen (N) include, for example, Ta, Pt, Te, Zr, Hf, Ti, W, Si, Cr, Ga, Mo, Sn, Pd, Ni, B, F, O, C and H may be mixed. That is, in the absorption layer 4, in addition to indium (In) and nitrogen (N), Ta, Pt, Te, Zr, Hf, Ti, W, Si, Cr, Ga, Mo, Sn, Pd, Ni, B, F , O, C, and H may further contain one or more elements selected from the group.
- the absorption layer 4 by mixing Ta, Pt, Te, Sn, Pd, and Ni in the absorption layer 4, it is possible to impart conductivity to the film (absorption layer 4) while ensuring high absorption to EUV light. Become. Therefore, it is possible to improve the inspectability in the mask pattern inspection using DUV (Deep Ultra Violet) light having a wavelength of 190 to 260 nm.
- DUV Deep Ultra Violet
- Ga, Hf, Zr, Mo, Cr, and F when Ga, Hf, Zr, Mo, Cr, and F are mixed in the absorption layer 4, the film quality can be made more amorphous. Therefore, it is possible to improve the roughness and in-plane dimensional uniformity of the absorption layer pattern (mask pattern) after dry etching, or the in-plane uniformity of the transferred image.
- Ti, W, and Si when Ti, W, and Si are mixed in the absorption layer 4, it is possible to increase the resistance to cleaning.
- the content of one or more elements selected from the group is 5 atomic% or more and 35 atomic% or less with respect to the total number of atoms constituting the absorption layer 4 or the total number of atoms constituting the absorption pattern layer 41.
- the range is more preferable, and the range of 10 atomic% or more and 30 atomic% or less is further preferable.
- the absorption layer 4 according to the embodiment of the present invention is not limited to this.
- the absorption layer 4 according to the embodiment of the present invention may be, for example, one or more absorption layers, that is, a multi-layer absorption layer.
- a compound material containing Ta as a main component has been applied to the absorption layer 4 of the conventional EUV reflective photomask.
- the thickness of the absorption layer 4 needs to be 40 nm or more, and the OD.
- the thickness of the absorption layer 4 required to be 70 nm or more in order to obtain 2 or more.
- the extinction coefficient k of Ta is 0.041, but by applying a compound material containing indium (In) and nitrogen (N) having an extinction coefficient k of 0.06 or more to the absorption layer 4, according to Beer's law.
- the film thickness of the absorption layer 4 according to the embodiment of the present invention is preferably 17 nm or more and 45 nm or less. That is, when the film thickness of the absorption layer 4 is within the range of 17 nm or more and 45 nm or less, the projection effect can be sufficiently reduced as compared with the conventional absorption layer 4 formed of a compound material containing Ta as a main component. It can be done and the transfer performance is improved.
- the optical density (OD: Optical Density) value is the contrast between the absorption layer 4 and the reflection layer 2. If the OD value is less than 1, sufficient contrast cannot be obtained and the transfer performance deteriorates. Tend. Further, the above-mentioned "main component” means a component containing 50 atomic% or more with respect to the total number of atoms in the absorption layer.
- Example 1 First, a method for producing the reflective photomask blank 10 will be described with reference to FIG.
- a synthetic quartz substrate 11 having a low thermal expansion characteristic was prepared.
- a reflective layer 12 formed by laminating 40 laminated films of a pair of silicon (Si) and molybdenum (Mo) was formed on the prepared substrate 11.
- the thickness of the reflective layer 12 was set to 280 nm.
- a capping layer 13 was formed as an intermediate film on the formed reflective layer 12. Ruthenium (Ru) was used as the material for the capping layer 13.
- the layer thickness of the capping layer 13 was 3.5 nm.
- an absorption layer 14 containing a total of 100 atomic% of indium (In) and nitrogen (N) was formed on the capping layer 13.
- XPS X-ray photoelectron spectroscopy
- XRD X-ray diffractometer
- the crystallinity of the absorption layer 14 was amorphous, although the crystallinity was slightly observed.
- the layer thickness of the absorption layer 14 was 33 nm.
- a back surface conductive film 15 was formed of chromium nitride (CrN) on the surface of the substrate 11 opposite to the surface on which the reflective layer 12 was formed.
- the layer thickness of the back surface conductive film 15 was 100 nm.
- the reflective photomask blank 100 of Example 1 was produced by the above procedure.
- the film formation (formation of each layer) of each film (reflection layer 12, capping layer 13, absorption layer 14) on the substrate 11 was performed using a multi-dimensional sputtering apparatus.
- the layer thickness of each film was controlled by the sputtering time.
- the absorption layer 14 was formed so that the N / In ratio was 1.0 by controlling the amount of oxygen introduced into the chamber during sputtering by the reactive sputtering method.
- a method of manufacturing the reflective photomask 200 will be described with reference to FIGS. 5 to 8.
- a positive chemical amplification resist SEBP9012: manufactured by Shin-Etsu Chemical Co., Ltd.
- SEBP9012 manufactured by Shin-Etsu Chemical Co., Ltd.
- the layer thickness of the positive chemically amplified resist was 120 nm.
- the applied positive chemically amplified resist was baked at 110 ° C. for 10 minutes to form a resist film 16.
- a predetermined pattern was drawn on the resist film 16 using an electron beam drawing machine (JBX3030: manufactured by JEOL Ltd.).
- developing was performed using a spray developing machine (SFG3000: manufactured by Sigma Meltec).
- a resist pattern 16a was formed as shown in FIG.
- the resist pattern 16a was used as an etching mask, and the mask pattern was patterned on the absorption layer 14 by dry etching mainly using a chlorine-based gas. As a result, as shown in FIG. 7, an absorption pattern (absorption pattern layer) 141 was formed on the absorption layer 14. Subsequently, the resist pattern 16a was peeled off to prepare the reflective photomask 200 of Example 1 as shown in FIG.
- the absorption pattern layer 141 formed on the absorption layer 14 is for measuring the thickness of the absorption layer using a line width 64 nm LS (line and space) pattern and AFM on a reflective photomask 200 for transfer evaluation.
- a line width 64 nm LS (line and space) pattern and AFM on a reflective photomask 200 for transfer evaluation Includes an LS pattern with a line width of 200 nm and a 4 mm square absorption layer removing portion for measuring EUV reflectance.
- the line width 64 nm LS pattern is designed in each of the x direction and the y direction as shown in FIG. 9 so that the influence of the projection effect by EUV irradiation can be easily seen.
- the layer thickness of the absorption layer 14 was measured by a transmission electron microscope. Further, the measurement was carried out in the same manner in Examples 2 to 5 and Comparative Examples 1 to 7 below.
- Example 2 In Example 2, as the absorption layer 14, the atomic number ratio (N / In) of indium (In) and nitrogen (N) is 1.0, and the total content of indium (In) and nitrogen (N) is 1. A layer was formed in which 70 atomic% of the entire absorption layer 14 and the remaining 30 atomic% were Ga. Further, the layer thickness of the absorption layer 14 was set to 33 nm. Other than that, the reflective photomask blank 100 and the reflective photomask 200 of Example 2 were produced in the same manner as in Example 1.
- Example 3 In Example 3, as the absorption layer 14, the atomic number ratio (N / In) of indium (In) and nitrogen (N) is 1.0, and the total content of indium (In) and nitrogen (N) is 1. A layer was formed in which 70 atomic% of the entire absorption layer 14 and the remaining 30 atomic% were Ta. Further, the layer thickness of the absorption layer 14 was set to 33 nm. Other than that, the reflective photomask blank 100 and the reflective photomask 200 of Example 3 were produced in the same manner as in Example 1.
- Example 4 In Example 4, as the absorption layer 14, the atomic number ratio (N / In) of indium (In) and nitrogen (N) is 0.5, and the total content of indium (In) and nitrogen (N) is A layer to be 100 atomic% of the entire absorption layer 14 was formed. Further, the layer thickness of the absorption layer 14 was set to 33 nm. Other than that, the reflective photomask blank 100 and the reflective photomask 200 of Example 4 were produced in the same manner as in Example 1.
- Example 5 the absorption layer 14 has an atomic number ratio (N / In) of indium (In) and nitrogen (N) of 1.5, and the total content of indium (In) and nitrogen (N) is 1.5.
- a layer to be 100 atomic% of the entire absorption layer 14 was formed. Further, the layer thickness of the absorption layer 14 was set to 33 nm.
- the reflective photomask blank 100 and the reflective photomask 200 of Example 5 were produced in the same manner as in Example 1.
- Comparative Example 1 In Comparative Example 1, as the absorption layer 14, the atomic number ratio (N / In) of indium (In) and nitrogen (N) is 0, and the content of indium (In) is 100 atomic% of the entire absorption layer 14. Layer was formed. Further, the layer thickness of the absorption layer 14 was set to 33 nm. Other than that, the reflective photomask blank 100 and the reflective photomask 200 of Comparative Example 1 were produced in the same manner as in Example 1.
- Comparative Example 2 In Comparative Example 2, as the absorption layer 14, the atomic number ratio (N / In) of indium (In) and nitrogen (N) is 1.0, and the total content of indium (In) and nitrogen (N) is 1. A layer to be 100 atomic% of the entire absorption layer 14 was formed. Further, the layer thickness of the absorption layer 14 was set to 50 nm. Other than that, the reflective photomask blank 100 and the reflective photomask 200 of Comparative Example 2 were produced in the same manner as in Example 1.
- the absorption layer 14 has an atomic number ratio (N / In) of indium (In) and nitrogen (N) of 1.0, and the total content of indium (In) and nitrogen (N) is 1.0.
- a layer was formed in which 30 atomic% of the entire absorption layer 14 and the remaining 70 atomic% were Te.
- the layer thickness of the absorption layer 14 was set to 26 nm.
- the reflective photomask blank 100 and the reflective photomask 200 of Comparative Example 3 were produced in the same manner as in Example 1.
- Comparative Example 4 In Comparative Example 4, as the absorption layer 14, the atomic number ratio (N / In) of indium (In) and nitrogen (N) is 1.0, and the total content of indium (In) and nitrogen (N) is 1. A layer was formed in which 45 atomic% of the entire absorption layer 14 and the remaining 55 atomic% were Te. The layer thickness of the absorption layer 14 was set to 26 nm. Other than that, the reflective photomask blank 100 and the reflective photomask 200 of Comparative Example 4 were produced in the same manner as in Example 1.
- Comparative Example 5 In Comparative Example 4, as the absorption layer 14, the atomic number ratio (N / In) of indium (In) and nitrogen (N) is 0.4, and the total content of indium (In) and nitrogen (N) is A layer to be 100 atomic% of the entire absorption layer 14 was formed. Further, the layer thickness of the absorption layer 14 was set to 33 nm. Other than that, the reflective photomask blank 100 and the reflective photomask 200 of Comparative Example 5 were produced in the same manner as in Example 1.
- Comparative Example 6 In Comparative Example 6, as the absorption layer 14, the atomic number ratio (N / In) of indium (In) and nitrogen (N) is 1.0, and the total content of indium (In) and nitrogen (N) is 1. A layer to be 100 atomic% of the entire absorption layer 14 was formed. Further, the layer thickness of the absorption layer 14 was set to 15 nm. Other than that, the reflective photomask blank 100 and the reflective photomask 200 of Comparative Example 6 were produced in the same manner as in Example 1.
- Comparative Example 7 In Comparative Example 7, as the absorption layer 14, the atomic number ratio (N / In) of indium (In) and nitrogen (N) is 1.0, and the total content of indium (In) and nitrogen (N) is 1. A layer to be 100 atomic% of the entire absorption layer 14 was formed. Further, the layer thickness of the absorption layer 14 was set to 47 nm. Other than that, the reflective photomask blank 100 and the reflective photomask 200 of Comparative Example 7 were produced in the same manner as in Example 1.
- a conventional tantalum (Ta) -based absorption layer-based reflective photomask blank and a reflective photomask (hereinafter, also referred to as "existing Ta-based mask”).
- a molybdenum (Mo) layer and a silicon (Si) layer are repeatedly laminated on a synthetic quartz substrate having low thermal expansion characteristics, as in Examples 1 to 5 and Comparative Examples 1 to 7. It has a reflective layer (repeated number of 40), a capping layer 13 made of ruthenium (Ru) having a layer thickness of 3.5 nm, and an absorbing layer 14.
- the absorption layer 14 was formed by forming a film of TaO having a layer thickness of 2 nm on TaN having a layer thickness of 58 nm. Further, in the reflective photomask (existing Ta-based mask), a mask pattern was patterned on the absorption layer 14 of the reflective photomask in the same manner as in Examples 1 to 5 and Comparative Examples 1 to 7.
- the HV bias value is the line width difference of the transfer pattern depending on the orientation of the mask pattern, that is, the difference between the line width in the horizontal (Horizontal: H) direction and the line width in the vertical (Vertical: V) direction.
- the line width in the H direction indicates the line width of a linear pattern orthogonal to the surface formed by the incident light and the reflected light (hereinafter, may be referred to as an “incident surface”), and the line width in the V direction is the incident surface.
- the line width of the parallel linear pattern is shown. That is, the line width in the H direction is the length in the direction parallel to the incident surface, and the line width in the V direction is the length in the direction orthogonal to the incident surface.
- Table 1 is a table showing the HV bias and heat resistance of Examples 1 to 5, Comparative Examples 1 to 7, and the existing Ta mask.
- Table 1 shows a comparison of HV biases of each Example and each Comparative Example.
- the pattern size in the y direction was 20 nm and the HV bias value was 8.65 nm.
- the HV bias of the reflective photomask 200 of Example 1 is 5.13 nm
- the HV bias of the reflective photomask 200 of Example 2 is 4.17 nm
- the HV bias of the reflective photomask 200 of Example 3 is 4.17 nm.
- the HV bias was 4.61 nm
- the HV bias of the reflective photomask 200 of Example 4 was 5.13 nm
- the HV bias of the reflective photomask 200 of Example 5 was 5.13 nm.
- the HV bias of the reflective photomask 200 of Comparative Example 3 is 5.01 nm
- the HV bias of the reflective photomask 200 of Comparative Example 4 is 5.25 nm
- the HV bias of the reflective photomask 200 of Comparative Example 5 is 5. Was 5.13 nm. Therefore, it was confirmed that the projection effect can be suppressed or reduced as compared with the existing Ta mask.
- the transfer pattern of the reflective photomask 200 of Comparative Example 6 had a large roughness due to insufficient contrast, and the transfer patterns of the reflective photomask 200 of Comparative Example 1, Comparative Example 2 and Comparative Example 7 were not resolved.
- the HV bias could not be evaluated.
- Table 1 shows a comparison of heat resistance of each Example and each Comparative Example.
- Table 1 when the existing Ta-based mask was used, the film loss and the change in reflectance Ra were hardly confirmed.
- Comparative Example 2 Comparative Example 2
- Comparative Example 3 Comparative Example 2
- Comparative Example 6 Comparative Example 7
- Table 1 shows a comparison of heat resistance of each Example and each Comparative Example.
- the mask has a heat resistance higher than that of the existing Ta mask.
- the reflective photomask 200 of Example 5 was marked with “ ⁇ ” because the film loss and the change in reflectance Ra could not be confirmed.
- the reflective photomasks 200 of Comparative Examples 1 and 3 to 5 were used, film loss and changes in reflectance Ra were confirmed. Therefore, "x” is marked in the "heat resistance” column of "Comparative Example 1", “Comparative Example 3", “Comparative Example 4", and "Comparative Example 5".
- Table 1 shows a comprehensive evaluation of HV bias and heat resistance.
- Table 1 when the HV bias value is lower than the HV bias value (8.65) of the existing Ta mask and the heat resistance column is " ⁇ " or “ ⁇ ”, the "judgment” column is “judgment”. ⁇ ”was marked. Further, when the HV bias value is larger than the HV bias value (8.65) of the existing mask, or when the heat resistance column is "x”, "x" is marked in the "judgment” column. Therefore, in Table 1, “ ⁇ ” is marked in the “judgment” column of “Example 1”, “Example 2”, “Example 3”, “Example 4”, and “Example 5”.
- the absorption pattern layer 141 contains 50 atomic% or more of indium (In) and nitrogen (N) in total, and the atomic number ratio (N / In) of nitrogen (N) to indium (In) in the absorption pattern layer 141. ) Is 0.5 or more and 1.5 or less, and the reflective photomask 200 having a layer thickness of 17 nm or more and 45 nm or less of the absorption pattern layer 141 has good optical density OD value and heat resistance, and projection. The result was that the effect could be reduced, the life was long, and the transfer performance was improved. That is, it was confirmed that the reflective photomask 200 having more excellent transfer performance can be obtained.
- the reflective photomask blank 100 by using the reflective photomask blank 100 according to the above embodiment, the projection effect of the reflective photomask for patterning transfer using light having a wavelength in the extreme ultraviolet region as a light source can be suppressed or reduced, and at the time of exposure. It can be said that it was confirmed that the reflective photomask 200 having sufficient heat resistance could be produced.
- the reflective photomask blank and the reflective photomask according to the present invention can be suitably used for forming a fine pattern by EUV exposure in a manufacturing process of a semiconductor integrated circuit or the like.
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Abstract
Description
図1に示すように、本発明の実施形態に係る反射型フォトマスクブランク10は、基板1と、基板1上に形成された反射層2と、反射層2の上に形成されたキャッピング層3と、キャッピング層3の上に形成された吸収層4と、を備えている。
本発明の実施形態に係る基板1には、例えば、平坦なSi基板や合成石英基板等を用いることができる。また、基板1には、チタンを添加した低熱膨張ガラスを用いることができるが、熱膨張率の小さい材料であれば、本発明はこれらに限定されるものではない。
本発明の実施形態に係る反射層2は、露光光であるEUV光(極端紫外光)を反射するものであればよく、EUV光に対する屈折率の大きく異なる材料の組み合わせによる多層反射膜であってもよい。多層反射膜を含む反射層2は、例えば、Mo(モリブデン)とSi(シリコン)、またはMo(モリブデン)とBe(ベリリウム)といった組み合わせの層を40周期程度繰り返し積層することにより形成したものであってもよい。
本発明の実施形態に係るキャッピング層3は、吸収層4に転写パターン(マスクパターン)を形成する際に行われるドライエッチングに対して耐性を有する材質で形成されており、吸収層4をエッチングする際に、反射層2へのダメージを防ぐエッチングストッパとして機能するものである。キャッピング層3は、例えば、Ru(ルテニウム)で形成されている。ここで、反射層2の材質やエッチング条件により、キャッピング層3は形成されていなくてもかまわない。また、図示しないが、基板1の反射層2を形成していない面に裏面導電膜を形成することができる。裏面導電膜は、反射型フォトマスク20を露光機に設置するときに静電チャックの原理を利用して固定するための膜である。
図2に示すように、反射型フォトマスクブランク10の吸収層4の一部を除去することにより、即ち吸収層4をパターニングすることにより、反射型フォトマスク20の吸収パターン(吸収パターン層)41が形成される。EUVリソグラフィにおいて、EUV光は斜めに入射し、反射層2で反射されるが、吸収パターン層41が光路の妨げとなる射影効果により、ウェハ(半導体基板)上への転写性能が悪化することがある。この転写性能の悪化は、EUV光を吸収する吸収層4の厚さを薄くすることで低減される。吸収層4の厚さを薄くするためには、従来の材料よりEUV光に対する吸収性の高い材料、つまり波長13.5nmに対する消衰係数kの高い材料を適用することが好ましい。
なお、インジウム(In)に対する窒素(N)の原子数比が1.5を超えた膜は成膜することができないことが確認できたので、これを上限とした。また、原子数比(N/In)は、1.0のときに化学量論的に安定となるため、0.7以上1.2以下の範囲内がより好ましく、0.8以上1.0以下の範囲内がさらに好ましい。
OD=-log(Ra/Rm) ・・・(式1)
また、上述した「主成分」とは、吸収層全体の原子数に対して50原子%以上含んでいる成分をいう。
まず、反射型フォトマスクブランク10の作製方法について、図4を用いて説明する。
実施例1では、まず、図4に示すように、低熱膨張特性を有する合成石英の基板11を用意した。続いて、用意した基板11上に、シリコン(Si)とモリブデン(Mo)とを一対とする積層膜が40枚積層されて形成された反射層12を成膜した。また、反射層12の層厚は280nmとした。続いて、形成した反射層12上に、中間膜として、キャッピング層13を成膜した。キャッピング層13の材料としては、ルテニウム(Ru)を採用した。また、キャッピング層13の層厚は3.5nmとした。
なお、基板11上への各膜(反射層12、キャッピング層13、吸収層14)の成膜(各層の形成)は、多元スパッタリング装置を用いて行った。各膜の層厚は、スパッタリング時間で制御した。吸収層14は、反応性スパッタリング法により、スパッタリング中にチャンバーに導入する酸素の量を制御することで、N/In比が1.0になるように成膜した。
図5に示すように、まず、反射型フォトマスクブランク100の吸収層14上に、ポジ型化学増幅型レジスト(SEBP9012:信越化学社製)をスピンコートで塗布した。ポジ型化学増幅型レジストの層厚は120nmとした。続いて、塗布したポジ型化学増幅型レジストを、110℃で10分ベークして、レジスト膜16を形成した。続いて、レジスト膜16に、電子線描画機(JBX3030:日本電子社製)を用いて、所定のパターンを描画した。続いて、110℃、10分のプリベーク処理を行った後、スプレー現像機(SFG3000:シグマメルテック社製)を用いて現像処理を行った。これにより、図6に示すようにレジストパターン16aを形成した。
なお、吸収層14の層厚は、透過電子顕微鏡によって測定した。また、以下の実施例2~5及び比較例1~7においても同様に測定した。
実施例2では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が1.0となり、インジウム(In)と窒素(N)との合計含有量が吸収層14全体の70原子%、残りの30原子%がGaとなる層を成膜した。また、吸収層14の層厚を33nmとした。それ以外は、実施例1と同様に、実施例2の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
実施例3では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が1.0となり、インジウム(In)と窒素(N)との合計含有量が吸収層14全体の70原子%、残りの30原子%がTaとなる層を成膜した。また、吸収層14の層厚を33nmとした。それ以外は、実施例1と同様に、実施例3の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
実施例4では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が0.5となり、インジウム(In)と窒素(N)との合計含有量が吸収層14全体の100原子%となる層を成膜した。また、吸収層14の層厚を33nmとした。それ以外は、実施例1と同様に、実施例4の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
実施例5では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が1.5となり、インジウム(In)と窒素(N)との合計含有量が吸収層14全体の100原子%となる層を成膜した。また、吸収層14の層厚を33nmとした。それ以外は、実施例1と同様に、実施例5の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
比較例1では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が0となり、インジウム(In)の含有量が吸収層14全体の100原子%となる層を成膜した。また、吸収層14の層厚を33nmとした。それ以外は、実施例1と同様に、比較例1の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
比較例2では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が1.0となり、インジウム(In)と窒素(N)との合計含有量が吸収層14全体の100原子%となる層を成膜した。また、吸収層14の層厚を50nmとした。それ以外は、実施例1と同様に、比較例2の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
比較例3では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が1.0となり、インジウム(In)と窒素(N)との合計含有量が吸収層14全体の30原子%、残りの70原子%がTeとなる層を成膜した。また、吸収層14の層厚を26nmとした。それ以外は、実施例1と同様に、比較例3の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
比較例4では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が1.0となり、インジウム(In)と窒素(N)との合計含有量が吸収層14全体の45原子%、残りの55原子%がTeとなる層を成膜した。また、吸収層14の層厚を26nmとした。それ以外は、実施例1と同様に、比較例4の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
比較例4では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が0.4となり、インジウム(In)と窒素(N)との合計含有量が吸収層14全体の100原子%となる層を成膜した。また、吸収層14の層厚を33nmとした。それ以外は、実施例1と同様に、比較例5の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
比較例6では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が1.0となり、インジウム(In)と窒素(N)との合計含有量が吸収層14全体の100原子%となる層を成膜した。また、吸収層14の層厚を15nmとした。それ以外は、実施例1と同様に、比較例6の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
比較例7では、吸収層14として、インジウム(In)と窒素(N)との原子数比率(N/In)が1.0となり、インジウム(In)と窒素(N)との合計含有量が吸収層14全体の100原子%となる層を成膜した。また、吸収層14の層厚を47nmとした。それ以外は、実施例1と同様に、比較例7の反射型フォトマスクブランク100及び反射型フォトマスク200を作製した。
上述の実施例1~5及び比較例1~7とは別に、従来のタンタル(Ta)系吸収層を有する反射型フォトマスクブランク、及び反射型フォトマスク(以下「既存Ta系マスク」とも呼ぶ)も作製した。反射型フォトマスクブランクは、実施例1~5及び比較例1~7と同様に、低熱膨張特性を有する合成石英の基板上に、モリブデン(Mo)層とシリコン(Si)層とが繰り返し積層されてなる反射層(繰り返し回数40)と、層厚3.5nmのルテニウム(Ru)からなるキャッピング層13と、吸収層14とを有する。ただし、吸収層14は、層厚58nmのTaN上に層厚2nmのTaOを成膜したものとした。また、反射型フォトマスク(既存Ta系マスク)は、実施例1~5及び比較例1~7と同様に、この反射型フォトマスクの吸収層14にマスクパターンをパターニングを行ったものとした。
(ウェハ露光評価)
EUV露光装置(NXE3300B:ASML社製)を用いて、EUVポジ型化学増幅型レジストを塗布した半導体基板上に、実施例1~5及び比較例1~7の反射型フォトマスク200のマスクパターンを転写露光した。露光量は、図9に示したx方向LSパターンが設計通りに転写するように調節した。そして、電子線寸法測定機により転写されたレジストパターンの観察及び線幅測定を実施し、実施例1~5及び比較例1~7での反射型フォトマスク200で、HVバイアス値がどのように変化するかを、シミュレーションによって比較した。
EUV露光装置(NXE3300B:ASML社製)を用いた露光前後に、反射型フォトマスク200の吸収パターン層141の層厚と反射率Raを測定し、EUV露光前後で、吸収パターン層141の膜減りと反射率Raの変化がないかを確認した。吸収パターン層141の膜減りと反射率Raの変化とが確認されなかった場合に、「熱耐性」の欄に「〇」を記し、膜減りと反射率Raの変化とが確認された場合に、長期的な使用が困難なため「熱耐性」の欄に「×」を記した。
Claims (5)
- 極端紫外線を光源としたパターン転写用の反射型フォトマスクを作製するための反射型フォトマスクブランクであって、
基板と、
前記基板上に形成された多層膜を含む反射層と、
前記反射層の上に形成された吸収層と、を有し、
前記吸収層は、インジウム(In)と窒素(N)とを合計で50原子%以上含有し、
前記吸収層におけるインジウム(In)に対する窒素(N)の原子数比(N/In)は、0.5以上1.5以下であり、
前記吸収層の層厚は、17nm以上45nm以下である
反射型フォトマスクブランク。 - 前記吸収層は、タンタル(Ta)、プラチナ(Pt)、テルル(Te)、ジルコニウム(Zr)、ハフニウム(Hf)、チタン(Ti)、タングステン(W)、ケイ素(Si)、クロム(Cr)、ガリウム(Ga)、モリブデン(Mo)、錫(Sn)、パラジウム(Pd)、ニッケル(Ni)、ホウ素(B)、フッ素(F)、酸素(O)、炭素(C)及び水素(H)からなる群から選択された1種以上の元素を更に含有する
請求項1に記載の反射型フォトマスクブランク。 - 前記反射層と前記吸収層との間にキャッピング層を含む
請求項1又は2に記載の反射型フォトマスクブランク。 - 極端紫外線を光源としたパターン転写用の反射型フォトマスクであって、
基板と、
前記基板上に形成された多層膜を含む反射層と、
前記反射層の上に形成された吸収パターン層と、を有し、
前記吸収パターン層は、インジウム(In)と窒素(N)とを合計で50原子%以上含有し、
前記吸収パターン層におけるインジウム(In)に対する窒素(N)の原子数比(N/In)は、0.5以上1.5以下であり、
前記吸収パターン層の層厚は、17nm以上45nm以下である
反射型フォトマスク。 - 前記吸収パターン層は、タンタル(Ta)、プラチナ(Pt)、テルル(Te)、ジルコニウム(Zr)、ハフニウム(Hf)、チタン(Ti)、タングステン(W)、ケイ素(Si)、クロム(Cr)、ガリウム(Ga)、モリブデン(Mo)、錫(Sn)、パラジウム(Pd)、ニッケル(Ni)、ホウ素(B)、フッ素(F)、酸素(O)、炭素(C)及び水素(H)からなる群から選択された1種以上の元素を更に含有する
請求項4に記載の反射型フォトマスク。
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CN202180089908.2A CN116724141A (zh) | 2021-01-12 | 2021-11-12 | 反射型光掩模坯和反射型光掩模 |
US18/271,556 US20240077796A1 (en) | 2021-01-12 | 2021-11-12 | Reflective photomask blank and reflective photomask |
EP21919548.4A EP4279990A1 (en) | 2021-01-12 | 2021-11-12 | Reflective photomask blank and reflective photomask |
KR1020237023288A KR20230128018A (ko) | 2021-01-12 | 2021-11-12 | 반사형 포토마스크 블랭크 및 반사형 포토마스크 |
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Citations (2)
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JP2006190900A (ja) * | 2005-01-07 | 2006-07-20 | Toppan Printing Co Ltd | 反射型フォトマスクブランク、反射型フォトマスク、及びこれを用いた半導体装置の製造方法 |
WO2017038213A1 (ja) * | 2015-08-31 | 2017-03-09 | Hoya株式会社 | マスクブランク、位相シフトマスクおよびその製造方法、並びに半導体デバイスの製造方法 |
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JP5418293B2 (ja) | 2010-02-25 | 2014-02-19 | 凸版印刷株式会社 | 反射型フォトマスクおよび反射型フォトマスクブランクならびにその製造方法 |
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JP2006190900A (ja) * | 2005-01-07 | 2006-07-20 | Toppan Printing Co Ltd | 反射型フォトマスクブランク、反射型フォトマスク、及びこれを用いた半導体装置の製造方法 |
WO2017038213A1 (ja) * | 2015-08-31 | 2017-03-09 | Hoya株式会社 | マスクブランク、位相シフトマスクおよびその製造方法、並びに半導体デバイスの製造方法 |
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TW202234142A (zh) | 2022-09-01 |
CN116724141A (zh) | 2023-09-08 |
EP4279990A1 (en) | 2023-11-22 |
US20240077796A1 (en) | 2024-03-07 |
JP2022108203A (ja) | 2022-07-25 |
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