WO2005017621A1 - 位相シフトマスクの製造方法 - Google Patents
位相シフトマスクの製造方法 Download PDFInfo
- Publication number
- WO2005017621A1 WO2005017621A1 PCT/JP2004/011712 JP2004011712W WO2005017621A1 WO 2005017621 A1 WO2005017621 A1 WO 2005017621A1 JP 2004011712 W JP2004011712 W JP 2004011712W WO 2005017621 A1 WO2005017621 A1 WO 2005017621A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- etching
- pattern
- shielding film
- film
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/26—Phase shift masks [PSM]; PSM blanks; 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
- G03F1/26—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
- G03F1/26—Phase shift masks [PSM]; PSM blanks; Preparation thereof
- G03F1/30—Alternating PSM, e.g. Levenson-Shibuya 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
- G03F1/36—Masks having proximity correction features; Preparation thereof, e.g. optical proximity correction [OPC] design processes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
Definitions
- the present invention relates to a photomask used in, for example, a semiconductor device manufacturing process, and more particularly to a method for manufacturing an auxiliary butter-type phase shift mask that enables high-resolution pattern transfer.
- phase shift mask One of the super-resolution technologies in recent photolithography is the phase shift mask.
- Various types of phase shift masks have been proposed. Among them, there is an auxiliary pattern type phase shift mask as a phase shift mask for forming an isolated pattern such as a contact hole.
- the auxiliary pattern type phase shift mask comprises a main opening 22 formed on a transparent substrate 20 by a light-shielding film 21 and an auxiliary opening 2 provided in a peripheral portion thereof. 3 so that the light passing through the main opening 22 and the light passing through the auxiliary opening 23 have a phase difference of approximately 180 degrees, for example, the substrate in the main opening has a predetermined depth. It has an engraved substrate engraved part 24.
- the auxiliary opening 23 is set to have a fine line width and a fine position so that light passing through the auxiliary opening 23 does not resolve the resist on the substrate to be transferred.
- Patent Document 1 Japanese Patent Application Laid-Open No. 7-20625
- a light-shielding film 21 and a first resist film 25 are sequentially formed on a transparent substrate 20 (FIG. 4). (See (1)).
- the pattern corresponding to the main opening and the auxiliary opening is exposed using, for example, an electron beam exposure apparatus and developed to form a first resist pattern 25a, and the first resist pattern 25a is formed.
- a light-shielding film pattern 21a including a main opening 22 and an auxiliary opening 23 is formed (FIG. 4).
- a second resist film 26 is formed on the surface of the substrate obtained above (see FIG. 4 (4)).
- a pattern corresponding to the main opening is exposed on the second resist film using, for example, an electron beam exposure device, and developed to form a second resist pattern 26a (FIG. 4 (5)) .
- the substrate is etched using the resist pattern 26a as a mask to form the substrate engraved portion 24 (FIG. 4 (5)).
- remaining second register strike pattern 26 is peeled off a auxiliary pattern type phase shift mask is completed (FIG. 4 (6)) 0
- Patent Document 1 since the main opening and the auxiliary opening are close to each other, it is difficult to draw both the main opening and the auxiliary opening on the same resist film by electron beam drawing.
- Conventional method 2 proposes the following method (hereinafter referred to as Conventional method 2). The method is described with reference to FIG.
- a light-shielding film 21 and a first resist film 27 are sequentially formed on a transparent substrate 20 (see FIG. 5 (1)).
- the pattern corresponding to the main opening is exposed using, for example, an electron beam exposure apparatus, and developed to form a first resist pattern 27a, and the first resist pattern 27a is used as a mask to block light.
- the film is etched to form a light-shielding film pattern 21b including the main opening 22 (see FIG. 5 (2)).
- the substrate is etched using the first resist pattern 27a and the light-shielding film pattern 21b as a mask to form the substrate engraved portion 24 (see FIG. 5 (2)). After that, the remaining first resist pattern 27a is peeled off (Fig. 5 (3) reference).
- a second resist film 28 is formed on the surface of the substrate obtained above (see FIG. 5 (4)).
- a pattern corresponding to the auxiliary opening is exposed on the second resist film 28 using, for example, an electron beam exposure apparatus, and developed to form a second resist pattern 28a.
- the light-shielding film 21 is etched using the resist pattern as a mask (FIG. 5 (5)). Thereafter, the remaining second resist pattern 28a is peeled off to complete the auxiliary pattern type phase shift mask (FIG. 5 (6)). Disclosure of the invention
- the conventional method 1 has the following problems.
- the second resist pattern is formed for digging and etching the substrate in the main opening, but it is difficult to align the second resist pattern (drawing) with the main opening, and a slight displacement occurs.
- the light-shielding film may be exposed.
- the shape of the second resist pattern is distorted and the light-shielding property S is exposed.
- the exposed light-shielding film is damaged, the shape is deteriorated, and the reflectance of the light-shielding film having the surface anti-reflection film is usually reduced in that part.
- the quality is impaired, such as only changing.
- the portion indicated by the arrow is the portion where the light-shielding film 21 is damaged.
- 26a indicates a second resist pattern.
- the present invention relates to an auxiliary pattern type phase shift that can be manufactured without loss of quality.
- An object of the present invention is to provide a method for manufacturing a mask.
- the present invention has the following aspects.
- a photomask blank in which a light-shielding film, a thin film for forming an etching mask layer, and a first resist film are sequentially formed on a substrate;
- a first step comprising:
- the second resist pattern as a mask, etching a part of the transparent substrate to a depth such that the phases of light passing through the main opening and the auxiliary opening differ by a predetermined angle;
- a second step comprising:
- a third step comprising:
- a method for manufacturing a phase shift mask comprising:
- the light-shielding film is made of a material that can be etched with a fluorine-based etching medium, and the light-shielding film is etched with a fluorine-based etching medium.
- a method for manufacturing a phase shift mask according to (1) is made of a material that can be etched with a fluorine-based etching medium, and the light-shielding film is etched with a fluorine-based etching medium.
- FIG. 1 is a schematic cross-sectional view for explaining a manufacturing process of an auxiliary pattern type phase shift mask according to Example 1 of the present invention.
- FIG. 2 is a schematic cross-sectional view for explaining an embodiment in which a part of the etching mask layer is left in the manufacturing process of the auxiliary pattern type phase shift mask of the present invention.
- FIG. 3A and 3B are diagrams for explaining the auxiliary pattern type phase shift mask.
- FIG. 3A is a plan view of the auxiliary pattern type phase shift mask
- FIG. 3B is a dotted line A portion in FIG. 3A.
- FIG. 3A is a plan view of the auxiliary pattern type phase shift mask
- FIG. 3B is a dotted line A portion in FIG. 3A.
- FIG. 4 is a schematic cross-sectional view for explaining a manufacturing step (conventional method 1) of a conventional auxiliary pattern type phase shift mask.
- FIG. 5 is a schematic cross-sectional view for explaining a manufacturing step (conventional method 2) of a conventional auxiliary pattern type phase shift mask.
- FIG. 6 is a schematic cross-sectional view for explaining a problem in a manufacturing process (conventional method 1) of a conventional auxiliary pattern type phase shift mask.
- BEST MODE FOR CARRYING OUT THE INVENTION is a schematic cross-sectional view for explaining a problem in a manufacturing process (conventional method 1) of a conventional auxiliary pattern type phase shift mask.
- a light-shielding film pattern including a main opening and an auxiliary opening is formed, and then, in a second step, engraving etching of a transparent substrate is performed.
- the main opening and the auxiliary opening can be exposed simultaneously, and the alignment accuracy between them can be improved.
- the processing accuracy of the light-shielding film is improved.
- the etching mask layer can protect the light-shielding film during the engraving etching of the transparent substrate in the second step, and It is possible to prevent the light-shielding film from being damaged during the engraving etching. That is, the etching mask layer is damaged during the engraving etching of the transparent substrate, and since this etching mask layer is removed in the third step, there is no problem.
- the light-shielding film is a film having a function of substantially not transmitting exposure light, for example, a light-shielding film made of chromium or a chromium compound, and a function of transmitting exposure light at a desired transmittance.
- a light semi-transmissive film containing silicon, oxygen, nitrogen, carbon, or the like in a metal for example, a light semi-transmissive film containing silicon, oxygen, nitrogen, carbon, or the like in a metal.
- a transparent substrate is a glass substrate such as a quartz substrate, a transparent phase shift film such as SiO 2 (including SOG) formed on a glass substrate, and a transparent substrate between the glass substrate and the phase shift film. And those in which another transparent film such as a transparent etching stopper is interposed.
- FIG. 1 is a manufacturing process diagram of the auxiliary pattern type phase shift mask according to the present embodiment. Hereinafter, this embodiment will be described with reference to FIG.
- M in the transparent substrate 1 of quartz o S i consists of 2 1 6 film 2, C r thin film 3 for forming the Etsu quenching mask consisting of the first Le resist film 4 made of a positive type electron beam resist They were formed sequentially (see Fig. 1 (1)).
- pattern data corresponding to the main opening and the auxiliary opening is stored in an electron beam exposure apparatus.
- the pattern size B of the main opening was 1.0 m
- the pattern size C of the auxiliary pattern was 0.2 zm.
- the etching mask layer is etched by dry etching using C12 + 02 using an etching gas, and then the etching gas is changed to CF4 + O2.
- the light-shielding film was dry-etched to form an etching mask layer 3a including a main opening 5 and an auxiliary opening 6 and a light-shielding film pattern 2a (see FIG. 1 (2)).
- cleaning was performed (see FIG. 1 (3)).
- the processing accuracy of the light-shielding film was good.
- the pattern data corresponding to the main opening and the auxiliary opening is Since drawing was performed using the above electron beam exposure apparatus, highly accurate openings could be formed in both the main opening and the auxiliary opening.
- the above-mentioned electron beam lithography system has been developed in recent years with the development of electron beam lithography technology such as adoption of a high accelerating voltage and utilization of a proximity effect correction function. Were formed simultaneously (within ⁇ 5 nm) and faithfully with the design values.
- the main opening and the auxiliary opening are drawn in the same drawing process, the alignment accuracy can be kept within 30 nm by aligning using the same drawing machine. The position accuracy of both was also good.
- a second resist film 7 made of a positive electron beam resist was formed on the surface of the substrate obtained above (see FIG. 1 (4)).
- a pattern corresponding to the main opening was exposed on the second resist film 7 using the same electron beam exposure apparatus as described above, and developed to form a second resist pattern 7a.
- FIG. 1 (5) Next, using the resist pattern 7 as a mask, the transparent substrate 1 was etched by dry etching of CF 4 +02 to form the substrate engraved portion 8.
- the resist pattern 7a was slightly deviated from the main opening 5, and the etching mask layer 3a was slightly exposed. Further, as the etching progressed, the shape of the resist pattern 7a became loose, the exposed portion of the etching mask layer 3a became large, and damage to the etching mask layer 3a occurred. However, there was no effect on the light-shielding film 2 thereunder.
- the etching mask layer was removed using an etching solution composed of ceric ammonium nitrate and perchloric acid, and the substrate was washed to complete an auxiliary pattern type phase shift mask (FIG. 1 (7)).
- each material is used so that the light-shielding film and the transparent substrate have resistance to the etching of the etching mask layer. Therefore, the third step In this case, the etching mask layer can be removed.
- the present invention is not limited to the above embodiment.
- the engraving etching of the transparent substrate of the main opening is performed, but the etching of the auxiliary opening may be performed instead of the etching of the main opening.
- the auxiliary opening since the auxiliary opening has a fine size, it is preferable to etch the main opening from the viewpoint of processing accuracy.
- the phase is shifted by engraving the glass substrate.
- a thin film for phase shift formed on the glass substrate may be etched.
- the materials of the light-shielding film and the etching mask layer are not limited to the above-mentioned materials, and the etching mask layer has resistance when etching the light-shielding film, and can be selectively removed at the end. Can be appropriately selected.
- a combination of an etching mask layer and a light-shielding film a combination of a material that can be etched with a fluorine-based etching medium and a material that can be etched with a chlorine-based etching medium can be considered.
- Materials that can be etched with a chlorine-based etching medium include metals such as chromium, tantalum, titanium, aluminum, hafnium, vanadium, zirconia, one or more of these alloys, or oxygen in addition to these metals or alloys. , Nitrogen, carbon, fluorine, etc., and a metal compound containing one or more thereof, or a laminated film thereof.
- Examples of the material that can be etched with a fluorine-based etching medium include silicide of a high-melting metal, for example, silicide such as molybdenum, tungsten, or tantalum, or one or two of oxygen, nitrogen, carbon, and fluorine. The materials contained above are exemplified.
- the transparent substrate may be combined with either the etching mask layer or the light-shielding film.
- the transparent substrate since the glass substrate is etched by the fluorine-based etching medium, the transparent substrate depends on the etching medium used for removing the etching mask layer. If etched, the transparent substrate will be damaged.
- the etching medium is the case of dry etching
- dry etching In the case of dry etching gas and etching, it refers to the etching solution.
- dry etching is preferable from the viewpoint of processing accuracy.
- wet etching may be used, but if the etching mask is to be partially left as described below and processing accuracy is required for the remaining pattern, dry etching should be selected. it can.
- the light shielding film may be a light semi-transmissive film.
- the light translucent film a material containing a metal such as chromium, tantalum, titanium, aluminum, hafnium, vanadium, zirconium, or one or more of these alloys containing oxygen, nitrogen, carbon, fluorine, etc., and a high melting point
- a metal silicide for example, silicide such as molybdenum, tungsten, or indium.
- the light semi-transmissive film may be a film in which the phase difference is adjusted to a predetermined angle (for example, approximately 180 degrees).
- the active film is not limited to a single layer, but may be a layer that exhibits its function in multiple layers. In this case, it can be combined with a known functional layer such as a front and back anti-reflection film.
- the entire etching mask layer is removed in the third step, but it may be left partially depending on the purpose.
- the etching mask layer may be a film that substantially blocks the exposure light or a film that substantially blocks the exposure light when laminated with the light-shielding film. It is conceivable that the layer is left in a non-transferred area, an area where a pattern is not formed, an area where a mark is formed, and the like.
- a third resist pattern 9 is formed on the substrate (FIG. 2 (1)) obtained by completing the third step in the above embodiment.
- pattern exposure corresponding to the etching mask layer to be left is performed, and a third resist pattern 9a covering the etching mask layer to be developed is formed (FIG. 2 (3)).
- the etching mask layer 3 is etched using the third resist pattern 9a as a mask (FIG. 2 (3)).
- the remaining third resist pattern 9a is peeled off and washed to obtain an auxiliary pattern type phase shift mask partially leaving an etching mask layer (FIG. 2 (4)).
- an auxiliary pattern type phase shift mask can be manufactured without deteriorating quality.
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- Condensed Matter Physics & Semiconductors (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
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- Preparing Plates And Mask In Photomechanical Process (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/567,760 US7678509B2 (en) | 2003-08-15 | 2004-08-09 | Method of producing phase shift masks |
KR1020107002664A KR101140027B1 (ko) | 2003-08-15 | 2004-08-09 | 위상 시프트 마스크의 제조방법 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003293835A JP4443873B2 (ja) | 2003-08-15 | 2003-08-15 | 位相シフトマスクの製造方法 |
JP2003-293835 | 2003-08-15 |
Publications (1)
Publication Number | Publication Date |
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WO2005017621A1 true WO2005017621A1 (ja) | 2005-02-24 |
Family
ID=34191010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/011712 WO2005017621A1 (ja) | 2003-08-15 | 2004-08-09 | 位相シフトマスクの製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7678509B2 (ja) |
JP (1) | JP4443873B2 (ja) |
KR (2) | KR101197804B1 (ja) |
TW (2) | TWI397106B (ja) |
WO (1) | WO2005017621A1 (ja) |
Cited By (1)
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US9857679B2 (en) | 2015-08-21 | 2018-01-02 | Taiwan Semiconductor Manufacturing Company, Ltd. | Lithography mask and fabricating the same |
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CN108445707A (zh) * | 2018-05-15 | 2018-08-24 | 睿力集成电路有限公司 | 相移掩模板、相移掩模光刻设备以及相移掩模板的制作方法 |
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JPH06175346A (ja) * | 1992-12-03 | 1994-06-24 | Hoya Corp | 位相シフトマスクの製造方法及び位相シフトマスクブランク |
JPH1083066A (ja) * | 1996-08-21 | 1998-03-31 | Lg Semicon Co Ltd | 位相反転マスクの製造方法 |
JPH10239827A (ja) * | 1997-02-28 | 1998-09-11 | Nec Corp | フォトマスク |
JPH10319569A (ja) * | 1997-05-19 | 1998-12-04 | Toshiba Corp | 露光用マスク |
Family Cites Families (4)
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JPH0720625A (ja) | 1993-07-06 | 1995-01-24 | Sony Corp | 位相シフトマスクの作製方法 |
KR100322537B1 (ko) * | 1999-07-02 | 2002-03-25 | 윤종용 | 블랭크 마스크 및 이를 이용한 위상 반전 마스크 제조방법 |
TWI259329B (en) * | 2003-04-09 | 2006-08-01 | Hoya Corp | Method of manufacturing a photomask, and photomask blank |
JP4823711B2 (ja) * | 2006-02-16 | 2011-11-24 | Hoya株式会社 | パターン形成方法及び位相シフトマスクの製造方法 |
-
2003
- 2003-08-15 JP JP2003293835A patent/JP4443873B2/ja not_active Expired - Lifetime
-
2004
- 2004-08-09 KR KR1020067001823A patent/KR101197804B1/ko active IP Right Grant
- 2004-08-09 US US10/567,760 patent/US7678509B2/en active Active
- 2004-08-09 KR KR1020107002664A patent/KR101140027B1/ko active IP Right Grant
- 2004-08-09 WO PCT/JP2004/011712 patent/WO2005017621A1/ja active Application Filing
- 2004-08-13 TW TW093124296A patent/TWI397106B/zh not_active IP Right Cessation
- 2004-08-13 TW TW099104066A patent/TWI446407B/zh active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH06175346A (ja) * | 1992-12-03 | 1994-06-24 | Hoya Corp | 位相シフトマスクの製造方法及び位相シフトマスクブランク |
JPH1083066A (ja) * | 1996-08-21 | 1998-03-31 | Lg Semicon Co Ltd | 位相反転マスクの製造方法 |
JPH10239827A (ja) * | 1997-02-28 | 1998-09-11 | Nec Corp | フォトマスク |
JPH10319569A (ja) * | 1997-05-19 | 1998-12-04 | Toshiba Corp | 露光用マスク |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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TWI584058B (zh) * | 2011-10-21 | 2017-05-21 | 大日本印刷股份有限公司 | 大型相位移遮罩及大型相位移遮罩之製造方法 |
Also Published As
Publication number | Publication date |
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TW201025420A (en) | 2010-07-01 |
JP2005062571A (ja) | 2005-03-10 |
TWI397106B (zh) | 2013-05-21 |
KR20100029270A (ko) | 2010-03-16 |
US7678509B2 (en) | 2010-03-16 |
KR101197804B1 (ko) | 2012-12-24 |
KR20060055527A (ko) | 2006-05-23 |
US20060292454A1 (en) | 2006-12-28 |
TWI446407B (zh) | 2014-07-21 |
KR101140027B1 (ko) | 2012-07-20 |
TW200507067A (en) | 2005-02-16 |
JP4443873B2 (ja) | 2010-03-31 |
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