WO2002021210A1 - Photomasque a decalage de phase pour similigravure et ebauche de photomasque a decalage de phase pour similigravure - Google Patents
Photomasque a decalage de phase pour similigravure et ebauche de photomasque a decalage de phase pour similigravure Download PDFInfo
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- WO2002021210A1 WO2002021210A1 PCT/JP2001/007615 JP0107615W WO0221210A1 WO 2002021210 A1 WO2002021210 A1 WO 2002021210A1 JP 0107615 W JP0107615 W JP 0107615W WO 0221210 A1 WO0221210 A1 WO 0221210A1
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- layer
- phase shift
- halftone phase
- chromium
- transparent substrate
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/26—Phase shift masks [PSM]; PSM blanks; Preparation thereof
- G03F1/32—Attenuating PSM [att-PSM], e.g. halftone PSM or PSM having semi-transparent phase shift portion; 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
- G03F1/58—Absorbers, e.g. of opaque materials having two or more different absorber layers, e.g. stacked multilayer absorbers
Definitions
- the present invention relates to a photomask used for manufacturing high-density integrated circuits such as LSIs and super-LSIs, and a photomask blank for manufacturing the photomask.
- the present invention relates to a tone phase shift photomask and a blank for a halftone phase shift photomask for manufacturing the phase shift photomask.
- Semiconductor integrated circuits such as ICs, LSIs, and super LSIs are manufactured by repeating one lithography process using a photomask.
- a photomask for forming fine dimensions, for example, EP 0 090 924A2 (JP-A- 58-173744, JP-B-62-59296) [The use of a phase shift photomask as shown here is under consideration.
- Phase shift photomasks have been proposed to have various configurations.
- a halftone phase shift photomask as disclosed in JP-A-4-136854, US Patent No. 4890309 is proposed.
- the halftone phase shift photomask includes a transparent substrate, halftone phase shift film, and Thus, it has a light shielding film.
- thin film materials for photomask patterns are generally shown in, for example, US Patent No. 4985319 (EP 0 190867, Japanese Patent No. 1750121) and US Patent No. 4783371 (Japanese painting patent No. 1781105).
- Molybdenum silicide is known, and its processing characteristics are extremely excellent.
- JP-A-6-83027 and US Patent No. 5474864 (JP-A-7-140635) are mentioned.
- attempts to apply molybdenum silicide to a halftone phase shift film by oxidizing or nitriding it have been actively studied.
- the molybdenum silicide rhinoceros de performs dry etching with CF 4, CHF 3, SF 6 , C 2 F 6, NF 3, CF 4 + fluorine-based etching gas, such as H 2, CBrF 3
- CF 4 + fluorine-based etching gas such as H 2, CBrF 3
- the molybdenum silicide-based halftone phase shift film material itself exhibits excellent processing characteristics and chemical stability after processing, but if high-precision control of phase difference is also taken into account, high-precision The problem is that it becomes difficult to putter patterns.
- molybdenum silicide-based materials As described above, with the shortening of the exposure wavelength associated with the miniaturization of LSI patterns, attempts have been made to apply molybdenum silicide-based materials to halftone phase shift films that are compatible with shorter wavelength exposure. Although molybdenum silicide-based half-tone phase shift film materials exhibit excellent processing characteristics and chemical stability after processing, high-precision control of phase difference is also taken into account. Therefore, there is a problem that high-precision patterning becomes difficult.
- the present invention responds to this problem by using a molybdenum silicide-based halftone phase shift film material, and has excellent processing characteristics of the molybdenum silicide-based material, chemical stability after processing, and the like.
- An object of the present invention is to provide a halftone phase shift photomask having a structure in which the etching selectivity with respect to a quartz substrate is improved while maintaining the same.
- the aim is to provide blanks for halftone phase shift photomasks that enable the creation of such halftone phase shift photomasks.
- the halftone phase shift layer on the transparent substrate is made of molybdenum silicon.
- a blank for a halftone phase shift photomask comprising at least a layer containing at least one of oxygen and nitrogen, or both, and comprising at least two layers,
- This multilayer film contains a layer mainly composed of either chromium or tantalum or a chromium tantalum alloy, and contains either chromium or tantalum or a chromium tantalum alloy as a main component.
- a certain layer is characterized in that it is stacked closer to the transparent substrate than a layer containing molybdenum silicide as a main component and containing one or both of oxygen and nitrogen.
- the halftone phase shift layer is formed on the transparent substrate such that the phase difference determined by the following equation is in the range of ⁇ soil 7T / 3 radian ( ⁇ is an odd number). It is a characteristic.
- ⁇ ⁇ x (k, k + l) + j 2jt (u (k)-l) d (k) I ⁇
- ⁇ is the halftone phase shift of the (m ⁇ 2) layer on the transparent substrate.
- X (k, k + 1) is the phase change that occurs at the interface between the k-th layer and the (k + 1) -th layer.
- the changes u (k) and d (k) are the refractive index and thickness of the material constituting the k-th layer, respectively, and ⁇ is the wavelength of the exposure light.
- the film thickness is such that the transmittance of the halftone phase shift layer to the exposure light is 1 to 50% when the transmittance of the transparent substrate to the exposure light is 100. It is characterized by being formed on the transparent substrate.
- the halftone phase shift photomask of the present invention is formed on a transparent substrate.
- a half-tone phase shift layer composed mainly of molybdenum silicide, having at least a layer containing one or both of oxygen and nitrogen, and formed from a multilayer film of two or more layers.
- the multilayer film includes a layer mainly composed of one of chromium or tantalum or a chromium tantalum alloy, and a layer mainly composed of one of chromium or tantalum or a chromium tantalum alloy. It is characterized by being laminated on a side closer to the transparent substrate than a layer containing molybdenum silicide as a main component and containing one or both of oxygen and nitrogen.
- the halftone phase shift layer is formed on the transparent substrate such that the phase difference ⁇ obtained by the following equation is in the range of ⁇ ⁇ ⁇ / 3 radians ( ⁇ is an odd number). It is characterized by having.
- ⁇ gx (k, k + l) + V 2: t (u (k)-l) d (k) I ⁇
- ⁇ is the halftone phase shift of the (m_2) layer on the transparent substrate.
- X (k, k + 1) is the phase change that occurs at the interface between the k-th layer and the (k + 1) -th layer.
- the changes u (k) and d (k) are the refractive index and thickness of the material constituting the k-th layer, respectively, and ⁇ is the wavelength of the exposure light.
- the transmittance of the halftone phase shift layer with respect to exposure light is 1 to 50% when the transmittance of the transparent substrate with respect to the exposure light is 100%. It is characterized by being formed on the transparent substrate. D
- the blank for a halftone phase shift photomask of the present invention having such a structure uses a molybdenum silicide-based halftone phase shift film material and has excellent processing of a molybdenum silicide-based material.
- Blanks can be provided for halftone phase shift photomasks capable of fabricating halftone phase shift photomasks with improved etching selectivity to quartz substrates while maintaining characteristics, chemical stability after processing, etc. Blanks can be provided.
- the halftone phase shift film is composed of a multilayer film, and one of the layers (a layer mainly composed of chromium or tantalum or an alloy thereof) is composed of a material that can provide a sufficiently large etching selectivity with the transparent substrate. This enables high-precision machining.
- FIG. 1a is a cross-sectional view of a first embodiment of a blank for a halftone phase shift photomask of the present invention
- FIG. Lb is a cross-sectional view of a blank for a halftone phase shift photomask of the present invention. It is sectional drawing of the 2nd example of a form.
- FIG. 2a is a cross-sectional view of a first example of the embodiment of the halftone phase shift photomask of the present invention
- FIG. 2b is a second view of the embodiment of the halftone phase shift photomask of the present invention. It is sectional drawing of an example.
- FIG. 3 is a cross-sectional view showing a manufacturing process of the halftone phase shift photomask shown in FIG. 2a.
- FIG. 4 is a cross-sectional view of the test piece.
- FIG. 5 is a cross-sectional view for explaining a method of manufacturing the halftone phase shift photomask of the second example and an etching shape.
- FIG. 6 is a view for explaining the halftone phase shift method.
- FIG. 7 is a diagram for explaining a transfer method (projection exposure method) using a conventional mask.
- FIG. 6 is a diagram showing the principle of the halftone phase shift method
- FIG. 7 is a diagram showing a conventional method using a 100% light-shielding film such as chromium.
- FIGS. 6a and 7a are cross-sectional views of the photomask
- FIGS. 6b and 7b are the amplitudes of light on the photomask
- FIGS. 6c and 7c are the amplitudes of light on the wafer.
- 6 d and FIG. 7 d show the light intensity on the wafer, respectively, 911 and 921 are the substrate, 922 is the 100% light shielding film, and 912 is the phase of the incident light.
- a halftone phase shift film which is shifted by 180 degrees, and whose transmittance is in the range of 1% to 50%.
- And 9 23 are incident light.
- a 100% light-shielding film 922 made of chrome or the like is formed on a substrate 921 made of quartz glass or the like, and a light transmitting portion of a desired pattern is formed.
- the light intensity distribution on the wafer becomes wider as shown in Fig. 7d, resulting in poor resolution.
- the phase of the light transmitted through the halftone phase shift film 912 and the phase of the light transmitted through the opening thereof are substantially inverted.
- the light intensity at the pattern boundary becomes zero on the wafer and the skirt spread can be suppressed, and therefore the resolution can be improved. Therefore, the halftone of the halftone phase shift photomask can be improved.
- the phase shift film 912 is required to have two functions of phase inversion and transmittance adjustment.
- the phase inversion function is configured so that the phase is substantially inverted between the exposure light transmitted through the halftone phase shift film 912 and the exposure light transmitted through the opening. I just need.
- a halftone phase shift film (also referred to as a halftone phase shift layer) 912 is formed by, for example, “Principles of Optics” by M. Born, E. Wolf, pp. 62-8-632. If the film is treated as an absorption film, the multiple interference can be neglected, so the phase change ⁇ of the vertically transmitted light is calculated by the following formula, and ⁇ is included in the range of ⁇ ⁇ ⁇ ⁇ / 3 ( ⁇ is an odd number) At this time, the above-described phase shift effect is obtained.
- ⁇ x (k, k + 1) + 2jt (u (k) -1) d (k) I ⁇
- ⁇ is the halftone phase shift of the (m ⁇ 2) layer on the transparent substrate
- X (k, k + 1) is the phase change that occurs at the interface between the k-th layer and the (k + 1) -th layer.
- U (k) and d (k) are the refractive index and thickness of the material constituting the k-th layer, respectively
- ⁇ is the wavelength of the exposure light.
- the exposure light transmittance of the halftone phase shift film 912 for obtaining the halftone phase shift effect is as follows. It is determined by the size, area, arrangement, shape, etc. of the transfer pattern, and varies depending on the pattern.
- the exposure light transmittance of the halftone phase shift film 912 is included within the range of several percent of the optimum transmittance centered on the optimum transmittance determined by the pattern. Must be done.
- the optimum transmittance greatly varies within a wide range of 1% to 50% depending on the transfer pattern when the aperture is 100%.
- a halftone phase shift photomask having various transmittances is required in order to correspond to any pattern.
- phase reversal function and the transmittance adjustment function are the complex refractive index (refractive index and extinction coefficient) of the material constituting the halftone phase shift film (or each material constituting each layer in the case of multilayer). Determined by thickness and thickness .
- the halftone phase shift film is formed by adjusting the thickness of the halftone phase shift film and setting the phase difference obtained by the above equation to fall within the range of ⁇ ⁇ ⁇ / 3 ( ⁇ is an odd number). It can be used as a halftone phase shift layer of a mask.
- the halftone phase shift layer on the transparent substrate has at least a layer containing molybdenum silicide as a main component and containing one or both of oxygen and nitrogen; and A blank for a halftone phase shift photomask formed of a multilayer film of two or more layers, wherein the multilayer film includes a layer mainly composed of either chromium or tantalum or a chromium-tantalum alloy, and The layer mainly composed of either chromium or tantalum or a chromium tantalum alloy is more transparent than the layer mainly composed of molybdenum silicide and containing one or both of oxygen and nitrogen. This is achieved by being stacked on the side closer to the substrate.
- a layer composed mainly of chromium or tantalum or a chromium-tantalum alloy is more transparent on a transparent substrate than a layer composed mainly of molybdenum silicide and containing either or both of oxygen and nitrogen.
- Etching can be performed with a chlorine-based etching gas such as a mixed gas, but a transparent substrate such as synthetic quartz is not substantially etched by these chlorine-based gases.
- the film mainly composed of either chromium or tantalum or a chromium-tantalum alloy be formed as the first layer immediately above the transparent substrate because of its role.
- a film mainly composed of either chromium or tantalum or a chromium-tantalum alloy is formed on synthetic quartz, and molybdenum silicide is mainly composed thereon, and either or both of oxygen and nitrogen are formed.
- molybdenum silicide is used as the main component with a fluorine-based dry etching gas, and either oxygen or nitrogen is used.
- this halftone phase shift film has excellent chemical stability and processability, which are characteristics of a molybdenum-based thin film, and uses a silicide film, so that krypton fluoride excimer laser lithography is used. (Exposure wavelength: 248 nm), and has sufficient translucency for argon fluoride excimer laser lithography (exposure wavelength: 193 nm), so it can be used as a halftone phase shift film.
- a layer formed like a light shielding film in addition to the halftone phase shift layer is used in order to prevent exposure of the resist due to overlapping of adjacent shots. Is often provided.
- the light-shielding film may be used for adjusting the transfer characteristics of a pattern to be transferred.
- the light-shielding film a film mainly composed of chromium is used because of its plate making characteristics and its excellent durability. After forming a halftone phase shift film pattern, etching after plate making is performed. It may be performed with a cerium nitrate-based etchant.
- the halftone phase shift film contains a film containing chromium as a main component, this film is attacked by a cerium nitrate-based wet nictant (see Fig. 5 (d) in the process described later), and the pattern is defective.
- the corrosion resistance can be improved by adding oxygen, nitrogen, etc. to the film containing chromium as a main component. Therefore, the corrosion resistance can be improved.
- a film mainly composed of either chromium or tantalum or a chromium-tantalum alloy has a small thickness, and thus is unlikely to be attacked as shown in FIG. Alternatively, it is expected to be at a level that does not substantially cause a problem in transfer characteristics even if it is invaded.
- the half-tone phase shift photomask of the present invention having such a configuration, enables highly accurate pattern etching, has excellent stability after mask processing, and has a krypton fluoride excimer laser. (Wavelength: 248 nm), halftone phase shifter applicable to short wavelength exposure such as argon fluoride excimer laser (wavelength: 193 nm) It is possible to provide a photo mask.
- the film containing chromium as a main component is not particularly limited.
- a chromium layer, a chromium oxide layer, a chromium nitride layer, a chromium oxynitride layer, or the like can be used. It can also be prepared by mixing atoms other than oxygen and nitrogen if necessary. Further, it may contain Fe, Nb, Si, Y, Ce and the like as inevitable impurities.
- the ratio of each component in the film containing chromium as a main component is not particularly limited.
- the film containing tantalum as a main component is not particularly limited.
- a tantalum layer, a tantalum oxide layer, a tantalum nitride layer, a tantalum oxynitride layer, or the like can be used. It can also be prepared by mixing atoms other than oxygen and nitrogen, if necessary. Furthermore, it may contain Fe, Nb, Si, Y, Ce and the like as inevitable impurities.
- the ratio of each component in the film mainly containing tantalum is not particularly limited.
- the film mainly composed of a chromium tantalum alloy is not particularly limited, but for example, a chromium tantalum layer, a chromium tantalum oxide layer, a chromium tantalum nitride layer, a chromium tantalum oxynitride layer, or the like can be used.
- the ratio between chromium and tantalum is not particularly limited, and may be any ratio. It can also be prepared by mixing atoms other than oxygen and nitrogen if necessary. Furthermore, it may contain Fe, Nb, Si, Y, Ce and the like as inevitable impurities.
- the ratio of each component in the film mainly containing tantalum is not particularly limited.
- Such a chromium film, a tantalum film, a chromium tantalum film, or an oxide film, a nitride film, and an oxynitride film thereof have been conventionally used as a photomask.
- a tantalum metal film, a chromium metal film, or a chromium tantalum alloy film can be obtained. If oxygen and nitrogen are mixed together, an oxide film, a nitride film, or an oxynitride film can be obtained.
- the adjustment of the refractive index of these films can be controlled not only by the gas mixture ratio but also by the sputter pressure, sputter current, and the like.
- these chromium-based, tantalum-based, and chromium-tantalum-based films can be formed by using film forming techniques such as a vacuum deposition method, a CVD method, an ion plating method, and an ion beam sputtering method, in addition to the sputtering method.
- film forming techniques such as a vacuum deposition method, a CVD method, an ion plating method, and an ion beam sputtering method, in addition to the sputtering method.
- film forming techniques such as a vacuum deposition method, a CVD method, an ion plating method, and an ion beam sputtering method, in addition to the sputtering method.
- the atomic ratio of molybdenum to gayin in molybdenum silicide is not particularly limited.
- the contents of oxygen and nitrogen are not particularly limited. If necessary, it is possible to mix atoms other than oxygen and nitrogen. Furthermore, it may contain Fe, Nb, Si, Y, Ce, etc. as inevitable impurities.
- a metal silicide is used as a target and an inert gas such as argon is used as a sputtering gas. If oxygen, nitrogen are mixed, a molybdenum silicide oxide film, a molybdenum silicide nitride film, and a molybdenum silicide oxynitride film can be obtained.
- Adjustment of the refractive index of molybdenum silicide oxide film, molybdenum silicide nitride film, and molybdenum silicide oxynitride film can be controlled by gas mixture ratio, sputter pressure, sputter current, and the like.
- the layer containing molybdenum silicide as a main component and containing one or both of oxygen and nitrogen may be formed by a vacuum deposition method, a CVD method, an ion plating method, or an ion beam sputtering method, in addition to the sputtering method.
- a film can also be formed by using a film forming technique such as the above.
- FIG. La is a cross-sectional view of a first embodiment of the halftone phase shift photomask blank of the present invention
- Fig. Lb is a halftone phase shift photomask blank of the present invention
- FIG. 2A is a cross-sectional view of a second example
- FIG. 2A is a cross-sectional view of a first example of the embodiment of the halftone phase shift photomask of the present invention
- FIG. 2B is a view of the halftone phase shift photomask of the present invention.
- FIG. 3 is a cross-sectional view of a second example of the embodiment
- FIG. 3 is a cross-sectional view of a manufacturing process of the halftone phase shift photomask shown in FIG. 2A
- FIG. 4 is a cross-sectional view of a test piece
- FIG. FIG. 7A is a cross-sectional view for explaining the method for manufacturing the halftone phase shift photomask of the example, and explaining the etching shape.
- 110 is a transparent substrate
- 120 is a halftone phase shift layer
- 121 is a layer mainly composed of chromium or tantalum or a chromium-tanned alloy (hereinafter referred to as the first layer).
- 122 is a layer containing molybdenum silicide as a main component and containing one or both of oxygen and nitrogen (hereinafter also referred to as a second layer), and 125 is an 81-tone pattern region (shift layer pattern).
- 130 is a light-shielding layer (also called a substantial light-shielding film)
- 140 is a resist layer
- 140A is an opening
- 145 is a resist.
- Layer 145A is an opening.
- the blank for the halftone phase shift photomask in this example is composed of molybdenum silicide as a main component, a second layer 122 containing one or both of oxygen and nitrogen, and one of chromium or tantalum or a chromium-tantalum alloy.
- a halftone phase shift layer 120 composed of a first layer 121 whose main component is chromium or tantalum or chromium or tantalum on a transparent substrate 110 made of synthetic quartz.
- a first layer 121 mainly composed of a tantalum alloy and a second layer 122 mainly composed of molybdenum silicide and containing one or both of oxygen and nitrogen are formed.
- the halftone phase shift layer 120 of the blank for the half toe phase shift photomask of this example is provided with a second layer 1 ⁇ containing molybdenum silicide as a main component and containing one or both of oxygen and nitrogen.
- the photomask fabricated from this method can be applied to short-wavelength exposure light such as krypton fluoride excimer laser (wavelength: 248 nm) and argon fluoride excimer laser (wavelength: 193 nm).
- krypton fluoride excimer laser wavelength: 248 nm
- argon fluoride excimer laser wavelength: 193 nm.
- ⁇ is a phase change that is received by light vertically transmitted through a photomask in which two halftone phase shift layers 120 are formed on a transparent substrate 110
- x (k, k + 1) is Phase change occurring at the interface between the k-th layer and the (kH) -th layer
- u (k) and d (k) are the refractive index and thickness of the material constituting the k-th layer
- ⁇ is the exposure light Wavelength.
- the transmittance of the halftone phase shift layer 120 with respect to the exposure light is substantially equal to that of the transparent substrate because the phase shift effect is obtained.
- the film is formed on the transparent substrate 110 so as to have a thickness in the range of 50% when the transmittance of 110 is 100%.
- the first layer 121 containing one of chromium and tantalum or a chromium tantalum alloy as a main component may be one that can be etched with a chlorine-based gas.
- a chromium layer, a chromium oxide layer, a chromium nitride layer, or a chromium oxynitride layer is typically used as the layer containing chromium as the main component.
- a tantalum layer As described above, as the layer mainly containing tantalum, a tantalum layer, a tantalum oxide layer, a tantalum nitride layer, and a tantalum oxynitride layer are typically used.
- a film mainly composed of a chromium-tantalum alloy also has n
- a chromium tantalum layer a chromium tantalum oxide layer, a chromium tantalum nitride layer, and a chromium tantalum oxynitride layer are used.
- the second layer 122 containing molybdenum silicide as a main component and containing one or both of oxygen and nitrogen is formed by sputtering which has been conventionally used for forming a thin film for a photomask. It can be easily formed by the method.
- Synthetic quartz as transparent substrate 110 is transparent to short-wavelength exposure light such as krypton fluoride excimer laser (wavelength: 248 nm), argon fluoride excimer laser (wavelength: 193 nm), and photomask.
- first layer 121 mainly composed of either chromium or tantalum or chromium tantalum alloy is etched with a chlorine-based gas during the fabrication, the first layer 121 and the transparent substrate 1 are etched. A sufficient etching selectivity with 10 can be obtained.
- the blank for a halftone phase shift photomask of the second example is obtained by providing a light-shielding layer 130 on the phase shift layer 120 of the first example.
- the light-shielding layer 130 is provided around a halftone pattern area (shift layer pattern area) 125 to prevent exposure by multiple exposure of adjacent shots in wafer exposure and to prevent alignment marks and the like. This is a substantially light-shielding film for forming and the like.
- the light-shielding layer 130 is generally a chromium-based metal layer such as a chromium single layer, chromium oxide, chromium nitride, or chromium oxynitride layer, but is not limited thereto.
- chromium-based films can be formed by vacuum deposition, Films can also be formed using film forming techniques such as CVD, ion plating, and ion beam sputtering.
- a cerium nitrate-based etchant is used, and the light-shielding layer 130 is subjected to a wet-etching process. It is preferable to improve the corrosion resistance by including oxygen, nitrogen, and the like in the first layer 122.
- This example is manufactured using the halftone phase shift photomask blank of the first example shown in FIG. 1A, and the phase shift layer 120 is patterned in a predetermined shape.
- This example is manufactured by using the half-tone phase shift photomask blank of the second example shown in FIG. Lb, and the phase shift layer 120 is patterned into a predetermined shape, and A halftone pattern region (shift layer pattern region) 125 for obtaining a light-shielding effect and a light-shielding pattern region 135 for obtaining a substantial light-shielding effect are provided.
- the material and optical characteristics of each layer are not described here instead of the description of the halftone phase shift photomask blank of the second example shown in FIG.
- a halftone phase shift photomask blank of the first example shown in Fig. La is prepared (Fig. 3a), a resist layer 140 is applied on the halftone phase shift layer 120, and dried (Fig. 3b). Then, only a predetermined region of the resist layer 140 is exposed to light using an electron beam lithography apparatus or the like, and is developed to form the resist layer 140 according to the pattern shape of the halftone phase shift layer 120 to be manufactured. ( Figure 3c)
- the resist for forming the resist layer 140 is preferably one having good processability, a predetermined resolution, and good dry etching resistance, but is not particularly limited.
- the molybdenum silicide of the halftone phase shift layer 120 is used as a main component, and either oxygen or nitrogen is used.
- the second layer 1 ⁇ containing one or both of them and the first layer 121 containing chromium or tantalum or a chromium-tantalum alloy as a main component are successively etched (FIG. 3d), and the resist layer 140 is etched. Is peeled off to obtain an eight-tone phase shift layer pattern. (FIG. 3e)
- FIG. 3e Next, an example of a method for manufacturing the halftone phase shift photomask of the second example will be described with reference to FIG.
- the light-shielding layer 130 is a chromium-based light-shielding layer.
- the light-shielding layer 130 is formed using a chlorine-based gas and a molybdenum silicide is mainly formed using a fluorine-based gas. And of oxygen and nitrogen 01
- the second layer 122 containing one or both of them is etched successively using a chlorine-based gas to the first layer 121 containing chromium or tantalum or an alloy thereof as a main component.
- the resist layer is peeled off, and a resist layer 145 having a predetermined shape opening 145A is newly formed on the light shielding layer 130 in the same manner (FIG. 5A).
- ET etching is performed (FIG. 5b), and the resist layer 145 is stripped to obtain a halftone phase shift photo mask of the second example shown in FIG. 2b. .
- either the chromium or tantalum of FIG. 5a or the first layer 121 mainly composed of a chromium-tantalum alloy is etched, and as shown in FIG.
- the film 121 mainly composed of either chromium or tantalum or a chromium-tantalum alloy has a small thickness. It is unlikely to be affected, as shown in Figure 5d.
- FIGS. 5c and 5d are enlarged views of the portion D1 in FIG. 5a and the portion D2 in FIG. 5b, respectively.
- the film 121 containing either chromium or tantalum or a chromium-tantalum alloy as a main component has improved corrosion resistance by containing chromium containing oxygen, nitrogen, or the like, or by using a chromium-tantalum alloy.
- W0 shown in FIG. 5D can be made extremely small, and it is possible to surely prevent a problem in transfer characteristics.
- the first embodiment uses the half-tone phase shift photomask blank of the first example shown in FIG. 1A, and is manufactured by the manufacturing method shown in FIG. 3 and the halftone phase shift photomask of the first example shown in FIG. 2A. This is an example of forming a mask.
- a chromium-tantalum layer is sequentially formed on the transparent substrate 110 as follows.
- the blanks for the 81-in-1 phase-shift photomask are used to produce a halftone phase-shift photomask for KrF exposure.
- the high-purity synthetic quartz substrate is 6 inches square and 0.25 inches thick. Is a transparent substrate 110.
- the first layer 121 mainly composed of a chromium-tantalum alloy of the halftone phase shift layer 120 is formed on one surface of the optically polished and well-cleaned transparent substrate 110 to a film thickness of about lOnm under the following conditions. Formed. First layer 121 sputter conditions>
- the film thickness was about i40 nm.
- a sample (test piece shown in Fig. 4) was prepared by forming a film on a synthetic quartz substrate masked with tape under the same conditions, and forming a step by the lift-off method in which the masking was removed after film formation.
- the phase difference and transmittance with respect to the 248 nm light were measured with a commercially available phase difference measuring device (Laser-Tech Co., Ltd., MPM248), and were 179.22 degrees and 5.88%, respectively.
- an organic-based resist ZEP 7000 (manufactured by Zeon Corporation) 140, is applied onto the halftone phase shift layer 120 of the obtained blank for a halftone phase shift mask (FIG. 3a). Dry 0 .
- the second layer 122 containing molybdenum silicide as a main component of the halftone phase shift layer 120 and containing oxygen and the first layer 121 containing a chromium-tantalum alloy as a main component were successively etched.
- the dry etcher used had two etching chambers, and the following etching conditions 1 and 2 were performed in separate processing chambers.
- ICP part high density plasma generation 950W
- ICP power high density plasma generation 250W
- the etching under the etching condition 2 hardly etches certain synthetic quartz on the transparent substrate 110, and enables extremely high-precision phase difference control.
- the obtained halftone phase shift photomask can be put to practical use in terms of dimensional accuracy, cross-sectional shape, film thickness distribution, transmittance distribution, adhesion of the film to the substrate, etc. of the removed portion.
- the second embodiment uses the halftone phase shift photomask blank of the second example shown in FIG. Lb, and uses the manufacturing method shown in FIGS. 3 to 5 to produce the halftone phase shift of the first example shown in FIG. This is an example in which a photomask is formed.
- a first layer 121 mainly composed of a chromium-tantalum alloy and a second layer mainly composed of molybdenum silicide and oxygen A blank for a halftone phase shift photomask, in which a halftone phase shift film 120 composed of a layer 122 of the above and a light-shielding layer 130 composed of chrome was formed.
- the first layer is made of a chromium alloy and the corrosion resistance is improved.
- the light-shielding layer 130 made of chromium used in the production of a halftone phase shift photomask is replaced with a cerium nitrate-based ET.
- the corrosion resistance to wet etchants during wet etching using chants has been improved.
- the blank for the halftone phase shift photomask produced was for producing a halftone phase shift photomask for KrF exposure, and was a 6-inch square, 0.25-inch thick high-purity synthetic quartz.
- the substrate is a transparent substrate 110.
- a first layer 121 mainly composed of a chromium-tantalum alloy of the halftone phase shift layer 120 is formed to a thickness of about 10 nm under the following conditions. Formed. First layer 121 sputter conditions>
- Film formation equipment Planar type DC magnetron sputtering equipment
- Argon gas 70SCCI11 Argon gas 70SCCI11
- a second layer 122 containing molybdenum silicide as a main component of the halftone phase shift layer 120 and containing oxygen was formed thereon under the following conditions.
- the film thickness was about 140 nm.
- a light-shielding layer 130 having a thickness of 1,000 A was formed on the second layer 122 containing oxygen as a main component and containing oxygen under the following conditions.
- Film forming equipment Planar type DC magnetron sputtering equipment
- Target Metallic chromium
- a sample (test piece shown in Fig. 4) was prepared by forming a film on a synthetic quartz substrate masked with tape under the same conditions, and forming a step by the lift-off method in which the masking was removed after film formation.
- the phase difference and transmittance for 248 nm light were measured with a commercially available phase difference measuring device (MPM248 manufactured by Lasertec Co., Ltd.), and were found to be 180.12 degrees and 6.33%, respectively.
- a sample was prepared by immersing this film in a commercially available chromium etchant (MR-ES manufactured by Intecc) for 240 seconds at room temperature.
- MR-ES chromium etchant
- the pattern cross section was observed by SEM. Erosion was observed as shown in Fig. 5d. Seven of them.
- a ZEP7000 (manufactured by Zeon Corporation) is applied and dried, and in the same manner as in the first embodiment, only a predetermined area of the resist is exposed and developed by an electron beam lithography apparatus, and the resist having a desired shape is developed.
- the halftone phase shift layer 120 exposed from the resist layer is selected by exposing it to high-density plasma using a commercially available dry mask for photomask (VLR700 manufactured by PT1). Dry etching was performed to obtain a desired halftone phase shift layer 120 pattern.
- the light-shielding layer 130 and the halftone phase shift layer 120 are mainly composed of molybdenum silicide, the second layer 122 containing oxygen, and the first layer 121 mainly composed of chromium tantalum alloy. Then, etching was performed under the conditions of etching condition 1, etching condition 2, and etching condition 3, respectively.
- the dry etcher used had two etching processing chambers, and the following etching conditions, etching conditions 2, and etching conditions 3 were performed in different processing chambers.
- ICP power high-density plasma generation
- 500W Bias power drawing power
- ICP power high density plasma generation
- 950W Bias power drawer power
- Example 2 as in Example 1, in the etching under the etching condition 3, the synthetic quartz as the transparent substrate 110 was hardly etched, and extremely high-precision phase difference control was possible.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01961323A EP1321820B1 (en) | 2000-09-04 | 2001-09-03 | Halftone phase shift photomask and blank for halftone phase shift photomask |
US10/363,604 US6869736B2 (en) | 2000-09-04 | 2001-09-03 | Halftone phase shift photomask and blank for halftone phase shift photomask |
DE60144154T DE60144154D1 (de) | 2000-09-04 | 2001-09-03 | Halbton-phasenverschiebungsfotomaske und rohling für eine halbton-phasenverschiebungsfotomaske |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-267552 | 2000-09-04 | ||
JP2000267552A JP2002072445A (ja) | 2000-09-04 | 2000-09-04 | ハーフトーン位相シフトフォトマスク及びハーフトーン位相シフトフォトマスク用ブランクス |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002021210A1 true WO2002021210A1 (fr) | 2002-03-14 |
Family
ID=18754459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/007615 WO2002021210A1 (fr) | 2000-09-04 | 2001-09-03 | Photomasque a decalage de phase pour similigravure et ebauche de photomasque a decalage de phase pour similigravure |
Country Status (6)
Country | Link |
---|---|
US (1) | US6869736B2 (ja) |
EP (1) | EP1321820B1 (ja) |
JP (1) | JP2002072445A (ja) |
DE (1) | DE60144154D1 (ja) |
TW (1) | TW494274B (ja) |
WO (1) | WO2002021210A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1116998A2 (en) * | 1999-12-15 | 2001-07-18 | Dai Nippon Printing Co., Ltd. | Blank for halftone phase shift photomask and halftone phase shift photomask |
US7115341B2 (en) * | 2002-02-22 | 2006-10-03 | Hoya Corporation | Halftone phase shift mask blank, halftone phase shift mask, and method of producing the same |
CN103229099A (zh) * | 2010-11-22 | 2013-07-31 | 信越化学工业株式会社 | 光掩模坯料、制造光掩模的方法、以及含铬材料膜 |
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US6730445B2 (en) * | 2002-04-12 | 2004-05-04 | International Business Machines Corporation | Attenuated embedded phase shift photomask blanks |
WO2003089990A2 (en) * | 2002-04-19 | 2003-10-30 | Applied Materials, Inc. | Process for etching photomasks |
JP2003322952A (ja) * | 2002-04-30 | 2003-11-14 | Mitsubishi Electric Corp | 高透過率型ハーフトーン位相シフトマスクおよび半導体装置の製造方法 |
KR100549268B1 (ko) * | 2003-12-31 | 2006-02-03 | 동부아남반도체 주식회사 | 위상반전 마스크 및 그 제조방법 |
TWI264823B (en) * | 2004-08-31 | 2006-10-21 | Taiwan Tft Lcd Ass | Thin film transistor manufacture method and structure therefor |
US8268538B2 (en) * | 2004-08-31 | 2012-09-18 | Taiwan Tft Lcd Association | Method for producing a thin film transistor |
KR101143005B1 (ko) * | 2004-12-14 | 2012-05-08 | 삼성전자주식회사 | 마스크 및 이를 이용한 반도체 소자의 제조 방법 및 박막트랜지스터 표시판의 제조 방법 |
JP2006292840A (ja) * | 2005-04-06 | 2006-10-26 | Advanced Lcd Technologies Development Center Co Ltd | 露光方法及びハーフトーン型位相シフトマスク |
JP5433925B2 (ja) * | 2006-02-23 | 2014-03-05 | 大日本印刷株式会社 | マスクブランクおよび階調マスク |
JP4509050B2 (ja) | 2006-03-10 | 2010-07-21 | 信越化学工業株式会社 | フォトマスクブランク及びフォトマスク |
JP4883278B2 (ja) | 2006-03-10 | 2012-02-22 | 信越化学工業株式会社 | フォトマスクブランク及びフォトマスクの製造方法 |
JP4737426B2 (ja) * | 2006-04-21 | 2011-08-03 | 信越化学工業株式会社 | フォトマスクブランク |
US8450193B2 (en) * | 2006-08-15 | 2013-05-28 | Varian Semiconductor Equipment Associates, Inc. | Techniques for temperature-controlled ion implantation |
US20110159411A1 (en) * | 2009-12-30 | 2011-06-30 | Bennett Olson | Phase-shift photomask and patterning method |
US8502544B1 (en) * | 2012-05-14 | 2013-08-06 | Taiwan Mask Corporation | Method for testing mask articles |
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- 2000-09-04 JP JP2000267552A patent/JP2002072445A/ja not_active Withdrawn
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2001
- 2001-09-03 DE DE60144154T patent/DE60144154D1/de not_active Expired - Lifetime
- 2001-09-03 WO PCT/JP2001/007615 patent/WO2002021210A1/ja active Application Filing
- 2001-09-03 US US10/363,604 patent/US6869736B2/en not_active Expired - Fee Related
- 2001-09-03 EP EP01961323A patent/EP1321820B1/en not_active Expired - Lifetime
- 2001-09-04 TW TW090121887A patent/TW494274B/zh not_active IP Right Cessation
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JPH0876353A (ja) | 1994-09-08 | 1996-03-22 | Nec Corp | 位相シフトマスクの製造方法 |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1116998A2 (en) * | 1999-12-15 | 2001-07-18 | Dai Nippon Printing Co., Ltd. | Blank for halftone phase shift photomask and halftone phase shift photomask |
EP1116998A3 (en) * | 1999-12-15 | 2002-10-23 | Dai Nippon Printing Co., Ltd. | Blank for halftone phase shift photomask and halftone phase shift photomask |
US7115341B2 (en) * | 2002-02-22 | 2006-10-03 | Hoya Corporation | Halftone phase shift mask blank, halftone phase shift mask, and method of producing the same |
US7632612B2 (en) | 2002-02-22 | 2009-12-15 | Hoya Corporation | Halftone phase shift mask blank, halftone phase shift mask, and method of producing the same |
CN103229099A (zh) * | 2010-11-22 | 2013-07-31 | 信越化学工业株式会社 | 光掩模坯料、制造光掩模的方法、以及含铬材料膜 |
US8968972B2 (en) | 2010-11-22 | 2015-03-03 | Shin-Etsu Chemical Co., Ltd. | Photomask blank, process for production of photomask, and chromium-containing material film |
CN103229099B (zh) * | 2010-11-22 | 2015-10-07 | 信越化学工业株式会社 | 光掩模坯料、制造光掩模的方法、以及含铬材料膜 |
US9488907B2 (en) | 2010-11-22 | 2016-11-08 | Shin-Etsu Chemical Co., Ltd. | Photomask blank, process for production of photomask, and chromium-containing material film |
Also Published As
Publication number | Publication date |
---|---|
EP1321820A1 (en) | 2003-06-25 |
JP2002072445A (ja) | 2002-03-12 |
US6869736B2 (en) | 2005-03-22 |
TW494274B (en) | 2002-07-11 |
EP1321820B1 (en) | 2011-03-02 |
US20030186135A1 (en) | 2003-10-02 |
DE60144154D1 (de) | 2011-04-14 |
EP1321820A4 (en) | 2004-01-21 |
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