WO2013190786A1 - 位相シフトマスクブランクス、位相シフトマスク及びその製造方法 - Google Patents
位相シフトマスクブランクス、位相シフトマスク及びその製造方法 Download PDFInfo
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- WO2013190786A1 WO2013190786A1 PCT/JP2013/003519 JP2013003519W WO2013190786A1 WO 2013190786 A1 WO2013190786 A1 WO 2013190786A1 JP 2013003519 W JP2013003519 W JP 2013003519W WO 2013190786 A1 WO2013190786 A1 WO 2013190786A1
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- phase shift
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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
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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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/38—Masks having auxiliary features, e.g. special coatings or marks for alignment or testing; Preparation thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/68—Preparation processes not covered by groups G03F1/20 - G03F1/50
- G03F1/80—Etching
Definitions
- the present invention relates to a phase shift mask blank, a phase shift mask, and a method for manufacturing the same, and more particularly to a device suitable for manufacturing a flat panel display (hereinafter referred to as “FPD”).
- FPD 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 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.
- the 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.
- the present invention provides a phase shift mask blank suitable for manufacturing an edge-enhanced phase shift mask with high mass productivity, a phase shift mask manufactured from the phase shift mask blank, and a manufacturing method thereof.
- the issue is to provide.
- a phase shift mask blank of the present invention has a transparent substrate, a phase shift layer mainly composed of Cr formed on the surface of the transparent substrate, and a direction from the transparent substrate toward the phase shift layer.
- An etching stopper layer mainly composed of at least one metal selected from Ni, Co, Fe, Ti, Si, Al, Nb, Mo, W and Hf formed on the phase shift layer;
- a light-shielding layer mainly composed of Cr formed on the etching stopper layer.
- Cr as a main component is composed of any one selected from Cr and Cr oxides, nitrides, carbides, oxynitrides, carbonitrides, and oxycarbonitrides. That means.
- phase shift mask of the present invention manufactured from the above phase shift mask blanks sequentially etches the light shielding layer and the etching stopper layer through a single mask having a predetermined opening pattern, thereby shielding the light shielding pattern and the etching stopper pattern.
- the phase shift layer is etched through the mask to form a phase shift pattern, and the opening width of the light shielding pattern is made wider than the opening width of the phase shift pattern.
- the method of manufacturing a phase shift mask of the present invention for manufacturing a phase shift mask from the above phase shift mask blanks includes a step of forming a single mask having a predetermined opening pattern on a light shielding layer, and a step through the formed mask. Sequentially etching the light shielding layer and the etching stopper layer to form a light shielding pattern and an etching stopper pattern, etching the phase shift layer over the mask to form a phase shift pattern, and the etching stopper pattern. And further etching. In this case, it is preferable to use an etching solution containing nitric acid for etching the etching stopper layer.
- the resist pattern is formed as a single mask having a predetermined opening pattern on the light shielding layer of the phase shift mask blanks.
- 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.
- 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.
- the phase shift layer having the same width as the etching stopper pattern is formed by etching the phase shift layer through the resist pattern.
- the opening width of the light shielding pattern becomes wider than the width of the phase shift pattern.
- the light shielding pattern and the etching stopper pattern have the same width.
- the phase shift mask can be manufactured simply by patterning the phase shift mask blanks through a single mask, it can be manufactured more efficiently than when the film formation and patterning are alternately performed as in the conventional example, Since the number of manufacturing steps can be reduced as compared with the conventional example, the phase shift mask can be manufactured with high mass productivity.
- 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.
- FIG. 1 The schematic sectional drawing which shows the phase shift mask blanks of embodiment of this invention.
- 2A to 2E are process diagrams for explaining a method of manufacturing a phase shift mask for manufacturing a phase shift mask from the phase shift mask shown in FIG.
- MB is a phase shift mask blank according to an embodiment of the present invention.
- the phase shift mask blanks MB is formed on the transparent substrate S, the phase shift layer 11 formed on the transparent substrate S, the etching stopper layer 12 formed on the phase shift layer 11, and the etching stopper layer 12. And the light shielding layer 13 formed.
- 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) capable of providing a phase difference of 180 ° with respect to any light in the wavelength region of 300 to 500 nm (for example, i-line having a wavelength of 365 nm). Formed with.
- 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 sputtering, electron beam vapor deposition, laser vapor deposition, ALD, or the like, for example.
- the phase shift mask blanks MB includes, for example, a phase shift layer 11 containing Cr as a main component, an etching stopper layer 12 containing Ni as a main component, and Cr as a main component on a glass substrate S using a DC sputtering method.
- the light shielding layer 13 to be manufactured is manufactured in order.
- 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 resist pattern RP is formed as a single mask having a predetermined opening on the light shielding layer 13 which is the uppermost layer of the phase shift mask blank MB using a lithography technique.
- the light shielding layer 13 is wet etched using the first etching solution over the resist pattern RP.
- 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 since 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 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 light shielding layer 13 and the phase shift layer 11 have high resistance to the second etching solution, only the etching stopper layer 12 is patterned to form the etching stopper pattern 12a.
- the phase shift layer 11 is wet-etched using the first etching solution over the resist pattern RP.
- the light shielding pattern 13a is made of the same Cr-based material as the phase shift layer 11 and the side surfaces of the light shielding pattern 13a are exposed, the phase shift layer 11 is patterned to form the phase shift pattern 11a and light shielding.
- the pattern 13a is also etched. As a result, the opening width d2 of the light shielding pattern 13a becomes wider than the opening width d1 of the phase shift pattern 11a.
- the etching stopper pattern 12a is further wet etched using the second etching solution.
- the opening width of the etching stopper pattern 12b is made equal to the opening width d2 of the light shielding pattern 13b.
- the edge-enhanced type in which the opening width d2 of the light shielding pattern 13b (and the etching stopper pattern 12b) is wider than the opening width d1 of the phase shift pattern 11a.
- a phase shift mask M is obtained. Since a known resist stripping solution can be used for removing the resist pattern RP, detailed description thereof is omitted here.
- 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 13a 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 of 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.
- An edge-enhanced phase shift mask M can be manufactured by forming a resist pattern RP on the light shielding layer 13 of the phase shift mask blank MB and wet-etching each layer through the resist pattern RP. Accordingly, 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. Therefore, the phase shift mask M can be manufactured with high mass productivity.
- 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 RP is formed on the phase shift mask blanks MB, and the light shielding layer 13 is etched through the resist pattern RP using a mixed etching solution of ceric ammonium 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 is etched using a mixed etching solution of cerium diammonium nitrate and perchloric acid through the resist pattern RP to form the phase shift pattern 11a, and the light shielding pattern 13a is side etched to shield the light. Pattern 13b was formed.
- the etching stopper pattern 12a is etched by using a mixed etching solution of nitric acid and perchloric acid to form an etching stopper pattern 12b, and the resist pattern RP is removed to obtain an edge-enhanced phase shift mask M. It was. 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%. Thus, it was found that the phase shift mask M that can be manufactured with high mass productivity can be used for FPD.
- the present invention is not limited to the above embodiment.
- the case where the resist pattern RP is removed after the etching stopper pattern 12 is formed has been described.
- the resist pattern RP may be removed at any timing as long as the phase shift layer 11 is etched.
- 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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Claims (4)
- 透明基板と、
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、
透明基板から位相シフト層に向かう方向を上とし、位相シフト層上に形成された、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、
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ることを特徴とする位相シフトマスクブランクス。 - 請求項1記載の位相シフトマスクブランクスから製造される位相シフトマスクであって、
所定の開口パターンを持つ単一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遮光パターンとエッチングストッパーパターンを形成し、前記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し、この位相シフトパターンの開口幅よりも遮光パターンの開口幅を広くしたことを特徴とする位相シフトマスク。 - 請求項1記載の位相シフトマスクブランクスから位相シフトマスクを製造する方法であって、
遮光層上に所定の開口パターンを持つ単一のマスクを形成する工程と、
この形成した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遮光パターンとエッチングストッパーパターンを形成する工程と、
前記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含む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3記載の位相シフトマスクの製造方法。
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JP2014501331A JP5661973B2 (ja) | 2012-06-20 | 2013-06-05 | 位相シフトマスクの製造方法 |
KR1020147001637A KR101560385B1 (ko) | 2012-06-20 | 2013-06-05 | 위상 쉬프트 마스크 블랭크, 위상 쉬프트 마스크 및 그 제조 방법 |
CN201380002495.5A CN104471478A (zh) | 2012-06-20 | 2013-06-05 | 相移掩模坯料、相移掩模及其制造方法 |
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Cited By (5)
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JP2015049282A (ja) * | 2013-08-30 | 2015-03-16 | Hoya株式会社 | 表示装置製造用フォトマスク、該フォトマスクの製造方法、パターン転写方法及び表示装置の製造方法 |
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 |
JP2017033004A (ja) * | 2016-09-21 | 2017-02-09 | Hoya株式会社 | 表示装置製造用フォトマスク、該フォトマスクの製造方法、パターン転写方法及び表示装置の製造方法 |
WO2019003486A1 (ja) * | 2017-06-28 | 2019-01-03 | アルバック成膜株式会社 | マスクブランクス、位相シフトマスク、ハーフトーンマスク、マスクブランクスの製造方法、及び位相シフトマスクの製造方法 |
KR20210116267A (ko) | 2020-03-16 | 2021-09-27 | 알박 세이마쿠 가부시키가이샤 | 마스크 블랭크스, 위상 시프트 마스크, 마스크 블랭크스의 제조 방법, 및 위상 시프트 마스크의 제조 방법 |
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JP6259508B1 (ja) * | 2016-12-28 | 2018-01-10 | 株式会社エスケーエレクトロニクス | ハーフトーンマスク、フォトマスクブランクス及びハーフトーンマスクの製造方法 |
JP6998181B2 (ja) * | 2017-11-14 | 2022-02-04 | アルバック成膜株式会社 | マスクブランク、位相シフトマスクおよびその製造方法 |
JP6756796B2 (ja) * | 2018-10-09 | 2020-09-16 | アルバック成膜株式会社 | マスクブランクス、ハーフトーンマスク、製造方法 |
KR102598440B1 (ko) * | 2019-12-20 | 2023-11-07 | 주식회사 에스앤에스텍 | 플랫 패널 디스플레이용 위상반전 블랭크 마스크 및 포토 마스크 |
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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 |
JP2017033004A (ja) * | 2016-09-21 | 2017-02-09 | Hoya株式会社 | 表示装置製造用フォトマスク、該フォトマスクの製造方法、パターン転写方法及び表示装置の製造方法 |
WO2019003486A1 (ja) * | 2017-06-28 | 2019-01-03 | アルバック成膜株式会社 | マスクブランクス、位相シフトマスク、ハーフトーンマスク、マスクブランクスの製造方法、及び位相シフトマスクの製造方法 |
JPWO2019003486A1 (ja) * | 2017-06-28 | 2019-06-27 | アルバック成膜株式会社 | マスクブランクス、位相シフトマスク、ハーフトーンマスク、マスクブランクスの製造方法、及び位相シフトマスクの製造方法 |
KR20210116267A (ko) | 2020-03-16 | 2021-09-27 | 알박 세이마쿠 가부시키가이샤 | 마스크 블랭크스, 위상 시프트 마스크, 마스크 블랭크스의 제조 방법, 및 위상 시프트 마스크의 제조 방법 |
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JP5661973B2 (ja) | 2015-01-28 |
CN104471478A (zh) | 2015-03-25 |
KR101560385B1 (ko) | 2015-10-26 |
JPWO2013190786A1 (ja) | 2016-02-08 |
KR20140038536A (ko) | 2014-03-28 |
TW201413370A (zh) | 2014-04-01 |
TWI599842B (zh) | 2017-09-21 |
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