WO2014103875A1 - 位相シフトマスクおよびその製造方法 - Google Patents
位相シフトマスクおよびその製造方法 Download PDFInfo
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- WO2014103875A1 WO2014103875A1 PCT/JP2013/084089 JP2013084089W WO2014103875A1 WO 2014103875 A1 WO2014103875 A1 WO 2014103875A1 JP 2013084089 W JP2013084089 W JP 2013084089W WO 2014103875 A1 WO2014103875 A1 WO 2014103875A1
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- phase shift
- pattern
- layer
- light shielding
- etching stopper
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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
- G03F1/29—Rim PSM or outrigger PSM; Preparation thereof
Definitions
- the present invention relates to a phase shift mask capable of forming a fine and highly accurate exposure pattern and a manufacturing method thereof, and more particularly to a technique suitable for use in manufacturing a flat panel display.
- a phase shift mask is used to expose and transfer a fine pattern onto a resist film formed on a substrate made of silicon, glass, or the like. Since the glass substrate for FPD has a larger area than the silicon substrate for semiconductor, in order to expose the FPD substrate with a sufficient amount of exposure light, the composite wavelength of g-line, h-line and i-line Exposure light is used. When such exposure light is used, an edge-enhanced phase shift mask has been conventionally used (see, for example, Patent Document 1).
- a halftone type phase shift mask is used as a technique for achieving further miniaturization (see, for example, Patent Document 2).
- this method when the phase is 180 ° at 193 nm, it is possible to set the location where the light intensity becomes zero and improve the patterning accuracy. Further, since there is a portion where the light intensity becomes zero, it is possible to set a large depth of focus, and it is possible to ease exposure conditions or improve patterning yield.
- a light shielding layer is formed on a transparent substrate, this light shielding layer is etched and patterned, and a phase shift layer is formed so as to cover the patterned light shielding layer.
- a phase shift mask is manufactured by etching and patterning. When film formation and patterning are alternately performed in this way, the transfer time between the apparatuses and the processing waiting time become long, and the production efficiency is remarkably lowered.
- the phase shift layer and the light shielding layer cannot be continuously etched through a single mask having a predetermined opening pattern, and it is necessary to form a mask (resist pattern) twice. Will increase. Therefore, there is a problem that the phase shift mask cannot be manufactured with high mass productivity.
- phase shift mask in which a phase shift layer, an etching stopper layer, and a light shielding layer are provided in this order on the transparent substrate surface is conceivable.
- the phase shift mask is manufactured by a photolithography method, an edge-enhanced phase shift mask in which the opening width of the pattern formed in the light shielding layer is wider than the opening width of the phase shift pattern, that is, the phase
- an edge-enhanced phase shift mask in which the phase shift pattern protrudes from the light shielding pattern is obtained.
- the opening shape differs depending on the layer, which is not preferable.
- phase shift mask suitable for manufacturing an edge-enhanced phase shift mask with high productivity
- the phase shift pattern in the pattern region is shielded from light. It is possible to manufacture a phase shift mask capable of high-definition processing by simultaneously forming a wide shape that protrudes from the pattern and a structure in which the phase shift layer, the etching stopper layer, and the light shielding layer have the same planar shape in the light shielding region. It aims at providing the means to do.
- a phase shift mask includes: a transparent substrate; a phase shift layer containing Cr as a main component formed on a surface of the transparent substrate; and the phase on the side away from the transparent substrate.
- An etching stopper layer formed mainly on at least one metal selected from Ni, Co, Fe, Ti, Si, Al, Nb, Mo, W and Hf formed on the surface of the shift layer;
- a light shielding layer mainly composed of Cr formed on the etching stopper layer on the side away from the surface, and formed in the light shielding layer with respect to the opening width of the phase shift pattern formed in the phase shift layer.
- a phase-shift region in which the opening width of the light-shielding pattern formed is set wide, and the opening width of the phase-shift pattern formed in the phase-shift layer and the light-shielding layer formed in the light-shielding layer A method of manufacturing a phase shift mask having a light shielding region in which the opening width of a turn is set to be equal, the step of forming the phase shift layer, the etching stopper layer, and the light shielding layer on the transparent substrate Forming a first mask having a predetermined opening pattern on the light shielding layer; and sequentially etching the light shielding layer and the etching stopper layer through the formed first mask to etch the light shielding pattern and the etching mask layer.
- etching stopper pattern Forming a stopper pattern; etching the phase shift layer over the first mask to form a phase shift pattern; and covering the light shielding pattern exposed on the light shielding pattern surface and the pattern opening,
- the etching stopper pattern and the phase shift pattern exposed at the pattern opening are Forming a second mask having a predetermined opening pattern so as not to be covered by the light shielding region but to be covered by the phase shift region; and the light shielding pattern and the etching stopper pattern over the formed second mask. And a step of further etching the etching stopper pattern after removing the second mask.
- an etching solution containing nitric acid can be used for etching the etching stopper layer.
- a transparent substrate a phase shift layer mainly composed of Cr formed on the surface of the transparent substrate; and formed on the surface of the phase shift layer on the side away from the transparent substrate
- An etching stopper layer mainly composed of at least one metal selected from Ni, Co, Fe, Ti, Si, Al, Nb, Mo, W and Hf; and on the side away from the phase shift layer
- a phase shift region having a wide width, the opening width of the phase shift pattern formed in the phase shift layer, and the opening width of the light shielding pattern formed in the light shielding layer are equal.
- the opening widths of the phase shift pattern, the etching stopper pattern, and the light-shielding pattern are made equal in the light-shielded area to maintain the alignment mark accuracy.
- an edge-enhanced phase shift mask that can cope with high definition can be manufactured with high mass productivity.
- Cr as a main component is composed of any one selected from Cr and Cr oxides, nitrides, carbides, oxynitrides, carbonitrides, and oxycarbonitrides. That means.
- a transparent substrate a phase shift layer mainly composed of Cr formed on the surface of the transparent substrate; and formed on the surface of the phase shift layer on the side away from the transparent substrate
- An etching stopper layer mainly composed of at least one metal selected from Ni, Co, Fe, Ti, Si, Al, Nb, Mo, W and Hf; and on the side away from the phase shift layer
- a phase shift region having a wide width is equal to the opening width of the phase shift pattern formed in the phase shift layer and the opening width of the light shielding pattern formed in the light shielding layer.
- a second mask having a predetermined opening pattern so as to be covered in the phase shift region Forming a second mask having a predetermined opening pattern so as to be covered in the phase shift region; etching the light-shielding pattern and the etching stopper pattern sequentially through the formed second mask; A step of further etching the etching stopper pattern after removing the second mask, so that in the edge-emphasized phase shift mask, the phase shift pattern, the etching stopper pattern, and the light shielding pattern in the light shielding region. It becomes possible to manufacture an edge-enhanced phase shift mask that can cope with high definition while maintaining the accuracy of the alignment mark by making the opening widths equal, with high productivity.
- an etching solution containing nitric acid can be used for etching the etching stopper layer (etching stopper pattern).
- a resist pattern (first mask) is formed as a single mask having a predetermined opening pattern on the light shielding layer of the phase shift mask blank, and the light shielding layer is etched through the resist pattern.
- a light shielding pattern having a predetermined width is formed.
- the etching stopper pattern is formed by etching the etching stopper layer through the resist pattern. At this time, although the side surface of the light shielding pattern is exposed, the light shielding pattern is made of a material different from that of the etching stopper pattern, so that the light shielding pattern and the etching stopper pattern have the same width.
- a phase shift pattern having the same width as the etching stopper pattern is formed.
- the opening width of the light shielding pattern becomes wider than the width of the phase shift pattern.
- the opening width of the light shielding pattern is wider than the opening width of the phase shift pattern by using the first mask.
- a predetermined opening pattern is formed so that the surface of the light shielding layer and the light shielding layer (side surface) exposed at the pattern opening are covered, and the etching stopper layer and the phase shift layer (phase shift pattern) exposed at the pattern opening are not covered.
- a second mask is formed.
- the side surfaces of the light shielding pattern, the etching stopper pattern, and the phase shift pattern exposed on the surface of the light shielding pattern and the pattern opening are all covered with the second mask. That is, a second mask having a predetermined width narrower than the opening width of the light shielding pattern, the etching stopper pattern, and the phase shift pattern is formed.
- the phase shift pattern having the same opening width as the opening width of the light shielding pattern is formed by etching the side face of the phase shift pattern exposed to the pattern opening through the resist pattern.
- the light shielding pattern exposed to the pattern opening is protected by the second mask and is not etched.
- the etching stopper pattern is further etched. At this time, by setting only the side surface of the etching stopper pattern, the light shielding pattern and the etching stopper pattern are set to have the same side surface.
- the side surfaces of the phase shift pattern and the light shielding pattern are exposed, but the phase shift pattern and the light shielding pattern are not etched because they are made of a material different from the etching stopper pattern, and the phase shift pattern, the light shielding pattern, and the etching stopper are not etched.
- the pattern is the same.
- the etching stopper pattern is etched also in the phase shift region.
- the phase shift mask can be manufactured in the light shielding region only by patterning the previously formed phase shift mask blanks. For this reason, it can be manufactured more efficiently compared to the case where film formation and patterning are performed alternately as in the conventional example, and the number of manufacturing steps can be reduced compared to the conventional example, so that a phase shift mask can be manufactured with high mass productivity. it can.
- the phase shift layer containing Cr as a main component is composed of any one selected from the oxides, nitrides, carbides, oxynitrides, carbonitrides, and oxycarbonitrides of the Cr,
- the film thickness is set so that the phase shift effect is sufficiently exhibited.
- the etching time becomes longer than 1 time with respect to the etching time of the light shielding layer, but the adhesion strength between the layers is sufficient. Since it is high, it is possible to form a favorable pattern as a photomask having a substantially straight line roughness and a substantially vertical pattern cross section.
- the adhesion strength between the light shielding film containing Cr and the phase shift layer containing Cr can be sufficiently increased.
- the etching liquid penetrates from the interface between the light shielding layer and the etching stopper layer or the interface between the etching stopper layer and the phase shift layer. Therefore, the CD accuracy of the formed light-shielding pattern and phase shift pattern can be increased, and the cross-sectional shape of the film can be made to be a shape close to a favorable vertical for the photomask.
- a wide shape in which the phase shift pattern in the pattern region protrudes from the light shielding pattern, and light shielding It is possible to form a high-definition mask by forming a structure in which the phase shift pattern, the etching stopper pattern, and the light shielding pattern in the region have the same planar shape.
- FIG. 1 and FIG. 2 are process diagrams schematically showing a method of manufacturing a phase shift mask according to the present embodiment, where MB is a phase shift mask blank.
- the phase shift mask blank MB of the present invention includes a transparent substrate S, a phase shift layer 11 formed on the transparent substrate S, and an etching formed on the phase shift layer 11. It comprises a stopper layer 12 and a light shielding layer 13 formed on the etching stopper layer 12.
- the transparent substrate S a material having excellent transparency and optical isotropy is used.
- a quartz glass substrate or a glass substrate can be used.
- size in particular of the transparent substrate S is not restrict
- the present invention can be applied to a substrate having a diameter of about 100 mm, a rectangular substrate having a side of about 50 to 100 mm to a side of 300 mm or more, and further, a quartz substrate having a length of 450 mm, a width of 550 mm, and a thickness of 8 mm, A substrate having a thickness of 1000 mm or more and a thickness of 10 mm or more can also be used.
- the flatness of the transparent substrate S may be reduced by polishing the surface of the transparent substrate S.
- the flatness of the transparent substrate S can be set to 20 ⁇ m or less, for example. As a result, the depth of focus of the mask is increased, and it is possible to greatly contribute to the formation of a fine and highly accurate pattern. Further, the flatness is preferably as small as 10 ⁇ m or less.
- the phase shift layer 11 and the light shielding layer 13 are mainly composed of Cr, and specifically, Cr alone, oxides, nitrides, carbides, oxynitrides, carbonitrides, and oxycarbonitrides of Cr. It can be composed of one selected from a product, or two or more selected from these can be laminated.
- the phase shift layer 11 has a thickness (for example, 90 to 170 nm) that can give a phase difference of about 180 ° to any light in the wavelength region of 300 to 500 nm (for example, i-line having a wavelength of 365 nm). ).
- the light shielding layer 13 is formed with a thickness (for example, 80 nm to 200 nm) that provides predetermined optical characteristics.
- a material mainly composed of at least one metal selected from Ni, Co, Fe, Ti, Si, Al, Nb, Mo, W, and Hf can be used.
- a —Ti—Nb—Mo film can be used.
- the phase shift layer 11, the etching stopper layer 12, and the light shielding layer 13 can be formed by, for example, a sputtering method, an electron beam evaporation method, a laser evaporation method, an ALD method, or the like.
- the phase shift mask M of the present embodiment has a phase shift layer (phase shift pattern) 11 capable of giving a phase difference of 180 °, and the opening width of the phase shift pattern 11a formed in the phase shift layer 11.
- the phase shift area PSA in which the opening width d2 of the light shielding pattern 13b formed in the light shielding layer 13 is set wider than d1 and the opening width d5 of the phase shift pattern 11b formed in the phase shift layer 11 and the light shielding layer 13 are formed.
- an alignment mark AM can be provided in the light shielding area MSA, and the light shielding area MSA can be provided around the periphery of the transparent substrate S so as to surround the phase shift area PSA in plan view. .
- phase shift mask M by using a composite wavelength including light in the above-described wavelength region, particularly g-line (436 nm), h-line (405 nm), and i-line (365 nm) as exposure light, the phase inversion action A region where the light intensity is minimized can be formed to make the exposure pattern clearer.
- the phase shift layer can be formed of a chromium oxynitride-based material, and the thickness of the phase shift layer can be set to have a phase difference of about 180 ° with respect to i-line.
- phase shift layer may be formed with a thickness capable of giving a phase difference of about 180 ° with respect to the h-line or the g-line.
- substantially 180 ° means 180 ° or near 180 °, and is, for example, 180 ° ⁇ 10 ° or less.
- this phase shift mask it is possible to improve the pattern accuracy based on the phase shift effect by using the light in the wavelength region, and it is possible to form a fine and highly accurate pattern. Thereby, a high-quality flat panel display can be manufactured.
- the phase shift mask of the present embodiment can be configured as a patterning mask for an FPD glass substrate, for example.
- a composite wavelength of i-line, h-line and g-line is used for exposure light.
- the phase shift mask blank MB of the present embodiment has a phase shift layer 11 containing Cr as a main component on a glass substrate S using a DC sputtering method, and Ni as a main component.
- the etching stopper layer 12 and the light shielding layer 13 mainly composed of Cr are sequentially formed.
- a method of manufacturing a phase shift mask for manufacturing the phase shift mask M from the phase shift mask blanks MB will be described.
- a photoresist layer PR1a is formed on the light shielding layer 13 which is the uppermost layer of the phase shift mask blank MB.
- the photoresist layer PR1a may be a positive type or a negative type.
- a liquid resist is used as the photoresist layer PR1a, but a dry film resist may be used.
- the photoresist layer PR1a is exposed and developed to remove the region PR1b and form a resist pattern RP1 on the light shielding layer 13.
- the resist pattern RP1 functions as an etching mask for the light shielding layer 13, and the shape is appropriately determined according to the etching pattern of the light shielding layer 13.
- the phase shift area PSA is set to have a shape having an opening width d1 equal to the opening width dimension d1 of the phase shift pattern to be formed.
- the light shielding layer 13 is wet etched using the first etching solution over the resist pattern RP1.
- an etching solution containing cerium diammonium nitrate can be used.
- cerium diammonium nitrate containing an acid such as nitric acid or perchloric acid is preferably used.
- the etching stopper layer 12 has high resistance to the first etching solution, only the light shielding layer 13 is patterned to form the light shielding pattern 13a.
- the light shielding pattern 13a has a shape having an opening width d1 equal to the resist pattern RP1.
- the etching stopper layer 12 is wet-etched using the second etching solution over the resist pattern RP.
- the second etching solution a solution obtained by adding at least one selected from acetic acid, perchloric acid, aqueous hydrogen peroxide and hydrochloric acid to nitric acid can be suitably used.
- the etching stopper layer 12 is patterned to form the etching stopper pattern 12a.
- the etching stopper pattern 12a has a shape having an opening width d1 equal to the opening width dimension d1 of the light shielding pattern 13a and the resist pattern RP1.
- the phase shift layer 11 is wet etched using the first etching solution over the resist pattern RP1, that is, without removing the resist pattern RP1.
- the phase shift layer 11 is patterned to form the phase shift pattern 11a.
- the phase shift pattern 11a has a shape having an opening width dimension d1.
- the light shielding pattern 13a is further side-etched to form a light shielding pattern 13b having an opening width d2 larger than the opening width dimension d1 of the phase shift pattern 11a.
- the etching stopper pattern 12a and the phase shift pattern 11a have a shape having an opening width d1 equal to the resist pattern RP1.
- the resist pattern RP1 is removed. Since a known resist stripping solution can be used for removing the resist pattern RP1, detailed description thereof is omitted here. So far, the dimensions in the phase shift area PSA have been described.
- the etching stopper pattern 12a and the phase shift pattern 11a have a shape having an opening width d3 equal to the resist pattern RP1, and the light shielding pattern.
- Reference numeral 13b denotes a shape having an opening width d5 larger than the opening width dimension d3 of the phase shift pattern 11a.
- the etching stopper pattern 12a and the phase shift pattern 11a have a shape having an opening width d6 equal to the resist pattern RP1, and the light shielding pattern.
- Reference numeral 13b denotes a shape having an opening width d4 larger than the opening width dimension d6 of the phase shift pattern 11a.
- a photoresist layer PR2a is formed on the entire surface of the glass substrate S.
- the photoresist layer PR2a is provided so as to cover the entire surface of the glass substrate S including the inside of the opening formed by the light shielding pattern 13b, the phase shift pattern 11a, and the etching stopper pattern 12a.
- the photoresist layer PR2a is exposed and developed to remove the region PR2b and form a resist pattern RP2.
- the resist pattern RP2 is provided so as to cover the entire opening pattern on the glass substrate S including the inside of the opening formed by the light shielding pattern 13b, the phase shift pattern 11a, and the etching stopper pattern 12a.
- the resist pattern RP2 has a pattern shape similar to the opening pattern on the glass substrate S, that is, a planar shape similar to the resist pattern RP1, and is formed to have different opening width dimensions.
- the resist pattern RP2 has an opening width smaller than the opening width dimensions d1 and d6 of the resist pattern RP1.
- the shape has d10 and d7. That is, the resist pattern RP2 has a light shielding pattern 13b, a phase shift pattern 11a, and an etching stopper pattern 12a in a pattern portion whose main purpose is to improve the patterning accuracy by setting a portion where the light intensity becomes zero.
- the width dimension is set so as to cover the side surface inside the opening pattern in which are stacked.
- the resist pattern RP2 has an opening width equal to the opening width dimension d3 of the resist pattern RP1, and covers only the side surface of the light shielding pattern 13b among the stacked side surfaces inside the opening.
- the width dimension is set so that the side surfaces of the phase shift pattern 11a and the etching stopper pattern 12a are exposed.
- the phase shift pattern 11a is wet-etched using the first etching solution over the resist pattern RP2, that is, in a state covered with the resist pattern RP2.
- the light shielding pattern 13b is not etched because it is covered with the resist pattern RP2 in both the phase shift area PSA and the light shielding area MSA.
- the phase shift pattern 11a is not etched because it is covered with the resist pattern RP2.
- the phase shift pattern 11a made of a Cr-based material is side-etched to form the phase shift pattern 11b.
- the phase shift pattern 11b has a shape having opening width dimensions d5 and d9.
- the light shielding pattern 13b is not etched.
- the opening width dimension of the phase shift pattern 11b can be set to be the same opening width d5 as that of the light shielding pattern 13b.
- the etching stopper pattern 12a remains in a shape having opening widths d3 and d6 equal to those before this step.
- the resist pattern RP2 is removed.
- the resist pattern RP2 can be removed in the same manner as the resist pattern RP1.
- the etching stopper pattern 12a is further wet etched using the second etching solution. Thereby, the opening width of the etching stopper pattern 12b is made the same as the opening widths d2, d4, d5 of the light shielding pattern 13b.
- a shift mask M is obtained.
- phase shift mask M in the light shielding area MSA, the phase shift pattern 11b, the light shielding pattern 13b, and the opening width d5 of the etching stopper pattern 12b are equal, that is, the phase shift pattern 11b in the opening pattern serving as the alignment mark AM,
- the side surfaces of the light shielding pattern 13b and the etching stopper pattern 12b are flush with each other, and have a shape substantially equal to the exposure direction of the exposure process.
- An enhanced phase shift mask M is obtained.
- the side surfaces of the phase shift pattern 11b, the light shielding pattern 13b, and the etching stopper pattern 12b in the opening pattern on the light shielding area MSA side are flush with each other, and the shape is substantially the same as the exposure direction of the exposure process.
- the width (d2-d1) of the phase shift pattern 11a exposed outside the light shielding pattern 13b is determined by the etching rate of the light shielding pattern 13b when the phase shift layer 11 is wet etched.
- the etching rate of the light shielding pattern 13 a is affected by the composition of the light shielding layer 13 and the interface state between the etching stopper layer 12 and the light shielding layer 13.
- the ratio of the chromium component in the layer mainly composed of chromium can be increased.
- the etching amount of the light shielding pattern 13a can be set, for example, within a range of 200 nm to 1000 nm.
- the phase shift mask blanks MB are configured by laminating the phase shift layer 11, the etching stopper layer 12, and the light shielding layer 13 in this order on the transparent substrate S.
- the edge emphasis type with high positional accuracy of the alignment mark AM The phase shift mask M can be manufactured. Therefore, since the number of manufacturing steps can be reduced and the production efficiency can be increased as compared with the conventional example in which film formation and etching are repeated, the phase shift mask M with high mass productivity and high visibility can be manufactured.
- the phase shift layer 11 is composed of any one selected from Cr oxide, nitride, carbide, oxynitride, carbonitride, and oxycarbonitride, and exhibits a phase shift effect sufficiently. It has a film thickness. In order to have such a film thickness that the phase shift effect is sufficiently exerted, the etching time becomes longer than 1 time with respect to the etching time of the light shielding layer 13, but the adhesion strength between the respective layers is increased. Since it is sufficiently high, it is possible to form a favorable pattern as a photomask having a line roughness that is approximately linear and a pattern cross section that is approximately vertical.
- the adhesion strength between the light shielding layer 13 containing Cr and the phase shift layer 11 containing Cr can be sufficiently increased. Therefore, when the light shielding layer 13, the etching stopper layer 12 and the phase shift layer 11 are etched with a wet etching solution, the interface between the light shielding layer 13 and the etching stopper layer 12, or the interface between the etching stopper layer 12 and the phase shift layer 11 is used. Therefore, the CD accuracy of the formed light-shielding pattern 13b and phase shift pattern 11a can be increased, and the cross-sectional shape of the film can be made close to a good vertical shape for the photomask.
- a chromium oxynitride carbide film as the phase shift layer 11 is formed to a thickness of 120 nm by sputtering, and a Ni—Ti—Nb—Mo film as the etching stopper layer 12 is formed to a thickness of 30 nm.
- a film composed of two layers of a chromium main component layer and a chromium oxide main component layer as the light shielding layer 13 is formed with a total thickness of 100 nm to obtain a phase shift mask blank MB. It was.
- a resist pattern RP1 is formed on the phase shift mask blanks MB, and the light shielding layer 13 is etched through the resist pattern RP1 using a mixed etching solution of cerium diammonium nitrate and perchloric acid to form a light shielding pattern 13a. Further, the etching stopper layer 12 was etched using a mixed etching solution of nitric acid and perchloric acid to form an etching stopper pattern 12a. Next, the phase shift layer 11 was etched using a mixed etching solution of ceric ammonium nitrate and perchloric acid to form a phase shift pattern 11a.
- a resist pattern RP2 was formed, and the phase shift pattern 11b was formed by side-etching the phase shift pattern 11a through the resist pattern RP2 using a mixed etching solution of cerium diammonium nitrate and perchloric acid.
- the resist pattern RP2 is removed, and then the etching stopper pattern 12a is etched using a mixed etching solution of nitric acid and perchloric acid to form the etching stopper pattern 12b.
- phase shift mask M Using the thus obtained phase shift mask M, exposure is performed using exposure light having a composite wavelength of g-line, h-line, and i-line, the line width of the exposed pattern is measured, and the target line width (2. As a result of obtaining the deviation with respect to 5 ⁇ m), it was confirmed that it can be suppressed to about 10%. At the same time, it was confirmed that the contour visibility of the alignment mark AM was good. Thus, it was found that the phase shift mask M that can be manufactured with high mass productivity can be used for FPD.
- MB phase shift mask blanks, S ... glass substrate (transparent substrate), 11 ... phase shift layer, 11a ... phase shift pattern, 12 ... etching stopper layer, 12a, 12b ... etching stopper pattern, 13 ... light shielding layer, 13a, 13b ... light-shielding pattern.
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Abstract
Description
本願は、2012年12月27日に、日本に出願された日本国特願2012-285846号に基づき優先権を主張し、その内容をここに援用する。
(2)本発明に係る一態様の位相シフトマスクの製造方法は、透明基板と;該透明基板の表面に形成された、Crを主成分とする位相シフト層と;前記透明基板から離間する側の前記位相シフト層表面に形成された、Ni、Co、Fe、Ti、Si、Al、Nb、Mo、W及びHfから選択された少なくとも1種の金属を主成分とするエッチングストッパー層と;前記位相シフト層から離間する側の前記エッチングストッパー層上に形成された、Crを主成分とする遮光層と、を備え、前記位相シフト層に形成された位相シフトパターンの開口幅よりも前記遮光層に形成された遮光パターンの開口幅が広く設定された位相シフト領域と、前記位相シフト層に形成された前記位相シフトパターンの前記開口幅と前記遮光層に形成された前記遮光パターンの前記開口幅とが等しく設定された遮光領域とを有する位相シフトマスクを製造する方法であって、前記透明基板に、前記位相シフト層と前記エッチングストッパー層と前記遮光層とを形成する工程と;前記遮光層上に所定の開口パターンを有する第1のマスクを形成する工程と;この形成した第1のマスク越しに前記遮光層と前記エッチングストッパー層とを順次エッチングして遮光パターンとエッチングストッパーパターンとを形成する工程と;前記第1のマスク越しに前記位相シフト層をエッチングし位相シフトパターンを形成する工程と;前記遮光パターン表面およびパターン開口に露出した遮光パターンが覆われるとともに、前記パターン開口に露出した前記エッチングストッパーパターンと前記位相シフトパターンとが、前記遮光領域では覆われず前記位相シフト領域では覆われるように、所定の開口パターンを有する第2のマスクを形成する工程と;この形成した第2のマスク越しに前記遮光パターンと前記エッチングストッパーパターンとを順次エッチングする工程と;前記第2のマスクを除去した後、前記エッチングストッパーパターンを更にエッチングする工程と、を有することを特徴とする。
(3)上記(2)の態様において、前記エッチングストッパー層のエッチングに硝酸を含むエッチング液を用いることができる。
尚、本発明において、Crを主成分とするとは、Cr並びにCrの酸化物、窒化物、炭化物、酸化窒化物、炭化窒化物及び酸化炭化窒化物から選択される何れか1種で構成されることをいう。
さらに、上記レジストパターン越しにエッチングストッパー層をエッチングすることで、エッチングストッパーパターンが形成される。このとき、遮光パターンの側面は露出しているが、遮光パターンはエッチングストッパーパターンとは異なる材料で構成されるためエッチングされず、遮光パターンとエッチングストッパーパターンとが同一幅となる。
このとき、位相シフト領域では遮光領域と異なり、遮光パターン表面およびパターン開口に露出した遮光パターンとエッチングストッパーパターンと位相シフトパターンとの側面がすべて第2のマスクにより覆われる。つまり、遮光パターンとエッチングストッパーパターンと位相シフトパターンとの開口幅よりも狭い所定幅を有する第2のマスクを形成する。
同時に、位相シフト領域においても、エッチングストッパーパターンはエッチングされる。以上の工程を経ることにより、遮光パターンおよびエッチングストッパーパターンの開口幅が位相シフトパターンの開口幅よりも広いエッジ強調型の位相シフトマスクが得られる。
以下では、本発明に係る位相シフトマスクの製造方法の一実施形態について、図面に基づいて説明する。
図1、図2は、本実施形態に係る位相シフトマスクの製造方法を模式的に示す工程図であり、図において、MBは位相シフトマスクブランクスである。
遮光領域MSAには、例えば、アライメントマークAMを設けることができ、遮光領域MSAは、平面視して位相シフト領域PSAの周囲を囲むように透明基板Sの周縁部に周設されることができる。
ここまで、位相シフト領域PSAにおける寸法について説明してきたが、遮光領域MSAにおいては、例えば、エッチングストッパーパターン12aおよび位相シフトパターン11aは、レジストパターンRP1と等しい開口幅d3を有する形状とされ、遮光パターン13bは位相シフトパターン11aの開口幅寸法d3よりも大きな開口幅d5を有する形状とされている。
また、遮光領域MSAにおいては、レジストパターンRP2は、レジストパターンRP1の開口幅寸法d3と等しい開口幅を有する形状とされて、開口内部の積層された側面のうち、遮光パターン13bの側面のみを覆うとともに、位相シフトパターン11a、エッチングストッパーパターン12aの側面を露出させるようにその幅寸法が設定される。
同時に、位相シフト領域PSAにおいて、位相シフトパターン11aは、レジストパターンRP2で覆われているのでエッチングされない。
そして、図2(q)に示すように、上記第2エッチング液を用いてエッチングストッパーパターン12aを更にウェットエッチングする。これにより、エッチングストッパーパターン12bの開口幅が遮光パターン13bの開口幅d2,d4,d5と同一にされる。
このため、ウェットエッチング液にて遮光層13、エッチングストッパー層12及び位相シフト層11をエッチングするときに、遮光層13とエッチングストッパー層12の界面や、エッチングストッパー層12と位相シフト層11の界面からエッチング液がしみ込まないので、形成される遮光パターン13b、位相シフトパターン11aのCD精度を高めることができ、かつ、膜の断面形状をフォトマスクにとって良好な垂直に近い形状とすることができる。
Claims (3)
- 透明基板と;
該透明基板の表面に形成された、Crを主成分とする位相シフト層と;
前記透明基板から離間する側の前記位相シフト層表面に形成された、Ni、Co、Fe、Ti、Si、Al、Nb、Mo、W及びHfから選択された少なくとも1種の金属を主成分とするエッチングストッパー層と;
前記位相シフト層から離間する側の前記エッチングストッパー層上に形成された、Crを主成分とする遮光層と、を備え、
前記位相シフト層に形成された位相シフトパターンの開口幅よりも前記遮光層に形成された遮光パターンの開口幅が広く設定された位相シフト領域と、
前記位相シフト層に形成された前記位相シフトパターンの前記開口幅と前記遮光層に形成された前記遮光パターンの前記開口幅とが等しく設定された遮光領域とを有することを特徴とする位相シフトマスク。 - 透明基板と;
該透明基板の表面に形成された、Crを主成分とする位相シフト層と;
前記透明基板から離間する側の前記位相シフト層表面に形成された、Ni、Co、Fe、Ti、Si、Al、Nb、Mo、W及びHfから選択された少なくとも1種の金属を主成分とするエッチングストッパー層と;
前記位相シフト層から離間する側の前記エッチングストッパー層上に形成された、Crを主成分とする遮光層と、を備え、
前記位相シフト層に形成された位相シフトパターンの開口幅よりも前記遮光層に形成された遮光パターンの開口幅が広く設定された位相シフト領域と、前記位相シフト層に形成された前記位相シフトパターンの前記開口幅と前記遮光層に形成された前記遮光パターンの前記開口幅とが等しく設定された遮光領域とを有する位相シフトマスクを製造する方法であって、
前記透明基板に、前記位相シフト層と前記エッチングストッパー層と前記遮光層とを形成する工程と;
前記遮光層上に所定の開口パターンを有する第1のマスクを形成する工程と;
この形成した第1のマスク越しに前記遮光層と前記エッチングストッパー層とを順次エッチングして遮光パターンとエッチングストッパーパターンとを形成する工程と;
前記第1のマスク越しに前記位相シフト層をエッチングし位相シフトパターンを形成する工程と;
前記遮光パターン表面およびパターン開口に露出した遮光パターンが覆われるとともに、前記パターン開口に露出した前記エッチングストッパーパターンと前記位相シフトパターンとが、前記遮光領域では覆われず前記位相シフト領域では覆われるように、所定の開口パターンを有する第2のマスクを形成する工程と;
この形成した第2のマスク越しに前記遮光パターンと前記エッチングストッパーパターンとを順次エッチングする工程と;
前記第2のマスクを除去した後、前記エッチングストッパーパターンを更にエッチングする工程と、を有することを特徴とする位相シフトマスクの製造方法。 - 前記エッチングストッパー層のエッチングに硝酸を含むエッチング液を用いることを特徴とする請求項2記載の位相シフトマスクの製造方法。
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CN111025840A (zh) * | 2018-10-09 | 2020-04-17 | 爱发科成膜株式会社 | 掩模坯、半色调掩模、掩模坯的制造方法及半色调掩模的制造方法 |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0450942A (ja) * | 1990-06-15 | 1992-02-19 | Fujitsu Ltd | レチクルおよびその製造方法 |
JPH08292550A (ja) * | 1995-04-21 | 1996-11-05 | Toppan Printing Co Ltd | 位相シフトマスク及びその製造方法 |
JPH08334886A (ja) * | 1995-06-02 | 1996-12-17 | Toppan Printing Co Ltd | ハーフトーン型位相シフトマスク及びその製造方法 |
JPH08334885A (ja) * | 1995-06-02 | 1996-12-17 | Toppan Printing Co Ltd | ハーフトーン型位相シフトマスク及びその製造方法 |
JP2008203374A (ja) * | 2007-02-16 | 2008-09-04 | Clean Surface Gijutsu:Kk | ハーフトーンブランクス |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100429860B1 (ko) * | 1997-05-27 | 2004-06-16 | 삼성전자주식회사 | 교번형 위상반전 마스크 및 그 제조방법 |
US7029803B2 (en) * | 2003-09-05 | 2006-04-18 | Schott Ag | Attenuating phase shift mask blank and photomask |
JP2005208660A (ja) * | 2004-01-22 | 2005-08-04 | Schott Ag | 超高透過率の位相シフト型のマスクブランク |
JP2005257962A (ja) * | 2004-03-11 | 2005-09-22 | Semiconductor Leading Edge Technologies Inc | 位相シフトマスク及び位相シフトマスクの製造方法 |
JP4693451B2 (ja) * | 2005-03-22 | 2011-06-01 | Hoya株式会社 | グレートーンマスクの製造方法及び薄膜トランジスタ基板の製造方法 |
JP4987075B2 (ja) * | 2007-11-01 | 2012-07-25 | アルバック成膜株式会社 | ハーフトーンマスク、ハーフトーンマスクブランクス、及びハーフトーンマスクの製造方法 |
-
2013
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0450942A (ja) * | 1990-06-15 | 1992-02-19 | Fujitsu Ltd | レチクルおよびその製造方法 |
JPH08292550A (ja) * | 1995-04-21 | 1996-11-05 | Toppan Printing Co Ltd | 位相シフトマスク及びその製造方法 |
JPH08334886A (ja) * | 1995-06-02 | 1996-12-17 | Toppan Printing Co Ltd | ハーフトーン型位相シフトマスク及びその製造方法 |
JPH08334885A (ja) * | 1995-06-02 | 1996-12-17 | Toppan Printing Co Ltd | ハーフトーン型位相シフトマスク及びその製造方法 |
JP2008203374A (ja) * | 2007-02-16 | 2008-09-04 | Clean Surface Gijutsu:Kk | ハーフトーンブランクス |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016188881A (ja) * | 2015-03-28 | 2016-11-04 | Hoya株式会社 | フォトマスクの製造方法、フォトマスク及びフラットパネルディスプレイの製造方法 |
CN111025840A (zh) * | 2018-10-09 | 2020-04-17 | 爱发科成膜株式会社 | 掩模坯、半色调掩模、掩模坯的制造方法及半色调掩模的制造方法 |
KR20200040656A (ko) * | 2018-10-09 | 2020-04-20 | 알박 세이마쿠 가부시키가이샤 | 마스크 블랭크스, 하프톤 마스크, 마스크 블랭크스의 제조 방법, 및 하프톤 마스크의 제조 방법 |
KR102220600B1 (ko) | 2018-10-09 | 2021-02-26 | 알박 세이마쿠 가부시키가이샤 | 마스크 블랭크스, 하프톤 마스크, 마스크 블랭크스의 제조 방법, 및 하프톤 마스크의 제조 방법 |
CN111025840B (zh) * | 2018-10-09 | 2023-10-24 | 爱发科成膜株式会社 | 掩模坯、半色调掩模、掩模坯的制造方法及半色调掩模的制造方法 |
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