CN1652021A - Raster polarization photomask plate and its application in projection photoetching system - Google Patents
Raster polarization photomask plate and its application in projection photoetching system Download PDFInfo
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- CN1652021A CN1652021A CN 200510011332 CN200510011332A CN1652021A CN 1652021 A CN1652021 A CN 1652021A CN 200510011332 CN200510011332 CN 200510011332 CN 200510011332 A CN200510011332 A CN 200510011332A CN 1652021 A CN1652021 A CN 1652021A
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Abstract
The grating polarization mask plate belongs to a farther optimization design of mask plate structure in projection optical photoetching system. It is characterized by that according to the characteristic line width of characteristic pattern on the mask plate, on the mask characteristic pattern etching a grating polarization structure with a certain width and depth, making grating structure for producing polarization light and traditional mask plate be combined into one body, and making the mask plate self-body have the function of outputting polarization light, and utilizing grating polarization mask to control the vector direction of electric field vector so as to control space coherent of electric field to attain the goal of raising resolution. Said invention also provides the application range of said projection photoetching equipment.
Description
Affiliated technical field
The present invention is a kind of raster polarization photomask plate, belongs to the further optimal design that substep repeats mask plate structure in projection optics etching system and the step-scan projection optics etching system.
Background technology
Along with modern microelectric technique develops to high integration ultra micro refinement direction, improve constantly the photolithography resolution level that the projection lithography equipment of making Micropicture can reach, become the key problem that modern lithographic technologies is badly in need of solution.Because " next generation " photoetching technique (as EUV photoetching technique, electron beam projection lithography technology, X-ray lithography technology or the like) still is in conceptual phase, and its technology, equipment and technology are very expensive, the progress of the maturity of optical lithography techniques and equipment and widespread use in addition, so research, development and application photolithography resolution enhancement techniques are for advancing photolithography limitation and promoting photoetching technique, equipment and IC industrial expansion to have crucial meaning.The phase shifting mask The Application of Technology, improved resolving power to a certain extent, but minimizing along with the photoetching lines basic cycle, the increase of light projection photoetching objective lens numerical aperture, the shortening of exposure wavelength, vector diffraction effect based on polarizability is increasing to the influence of litho pattern, and phase shifting mask just can not guarantee high-quality imaging; And the design of optimal phase shift device, position to place difficulty big, the manufacturing cost height, above-mentioned deficiency is difficult to satisfy the demand.
Summary of the invention
The technical issues that need to address of the present invention are: the deficiency that overcomes above-mentioned technology, utilize the amplitude of imaging beam and the 3rd information-polarization beyond the phase place, and provide a kind of raster polarization photomask plate that traditional masks and grating polarization structure are combined as a whole, it is relevant to control electric field space by the direction vector of control electric field intensity, thereby reaches the purpose that improves resolving power.
Purpose technical solution of the present invention is: raster polarization photomask plate, its characteristics are: cover the lighttight metal film of one deck on quartz substrate, on metal film, be etched with the feature pattern that needs photoetching, according to the feature pattern on the mask, the grating polarization structure of the etching respective width and the degree of depth on the mask features figure, the grating cycle P of grating polarization structure is (0.25～0.5) λ, wherein λ is the exposure wavelength of projection optics etching system, the etching depth of grating polarization structure is identical, its value h is (0.25～0.85) P, and wherein P is the grating cycle of grating polarization structure.
According to the feature pattern on the mask, on the mask features figure, be etched with the parallel or vertical grating polarization structure of feature pattern line orientations; Or a side is etched with the parallel grating polarization structure of feature pattern line orientations on the adjacent transmission region in the light tight zone of mask features figure, and the opposing party is etched with the vertical grating polarization structure of feature pattern line orientations.
Adopt the projection lithography system of above-mentioned raster polarization photomask plate, comprise light source, ellipsoidal mirror, lighting source, lamp optical system, light projection photoetching objective lens and silicon chip, it is characterized in that: illumination optical system is unified and is added the described raster polarization photomask plate of claim between the light projection photoetching objective lens, the illumination light that lighting source sends is collected by ellipsoidal mirror, pass through lamp optical system, be radiated on the raster polarization photomask plate, feature pattern on the raster polarization photomask plate produces not at the same level time diffraction imaging light beam, and the imaging beam of the different grating polarization structures generation different polarization directions on raster polarization photomask plate, imaging beam is collected also projection imaging on silicon chip by light projection photoetching objective lens.
Compared with the prior art the present invention has the following advantages:
(1) will produce the grating polarization structure of polarized light and the traditional masks structure that is integrated that hardens, make mask plate itself have the function of output polarization light, guaranteed that mask has enough transmitances to imaging beam, and the distribution of imaging light intensity is spread along with line orientations, improved resolving power, and projection lithography equipment need not done any change.
(2) raster polarization photomask plate utilizes the orthogonal imaging beam in polarization direction not produce interference effect, makes on the mask adjacent pattern see through the mutually perpendicular light in polarization direction, can reduce proximity effect, improves photolithography resolution.
(3) in the projection optics photoetching of sub-micro and hundred nano-scale, can use raster polarization photomask plate of the present invention, improve resolving power, in the proximity photoetching, use and also can improve photolithography resolution.
Description of drawings
Fig. 1 looks synoptic diagram for the master of raster polarization photomask plate embodiment 1 of the present invention;
Fig. 2 is the cross-sectional schematic of raster polarization photomask plate embodiment 1 of the present invention;
Fig. 3 looks synoptic diagram for the master of raster polarization photomask plate embodiment 2 of the present invention;
Fig. 4 is the cross-sectional schematic of raster polarization photomask plate embodiment 2 of the present invention;
Fig. 5 looks intention for the master of raster polarization photomask plate embodiment 3 of the present invention;
Fig. 6 is the cross-sectional schematic of raster polarization photomask plate embodiment 3 of the present invention;
Fig. 7 is that the present invention is applied to projection optics etching system structural representation.
Embodiment
Be the embodiment of the invention 1 as shown in Figure 1, 2, covered the lighttight metal film 8 of one deck on quartz substrate 7, metal film is chromium, molybdenum etc., and the thickness h of metal film is (0.25～0.85) P, and wherein P is the grating cycle of grating polarization structure.Being etched with on metal film 8 needs the lines of photoetching feature pattern, according to the lines feature pattern on the mask, in mask lines feature pattern, be etched with the grating polarization structure, the grating period p of grating polarization structure is (0.25～0.5) λ, and wherein λ is the exposure wavelength of projection optics etching system; Grating cycle P specifically is defined as m λ/(n ± sin θ), and wherein m is the order of diffraction time of diffracted beam, and λ is the exposure wavelength of projection optics etching system, and n is the refractive index of the metal film narrated, and θ is an incident angle.The etching depth h of grating polarization structure is (0.25～0.85) P, and wherein P is the grating cycle of grating polarization structure, and the grating polarization structure of etching is parallel with the feature pattern line orientations of mask.Such raster polarization photomask plate not only has the function of output polarization light, it is relevant that the direction vector that can also control electric field intensity is controlled electric field space, the light distribution of imaging beam is spread along with line orientations, guaranteed that mask has enough transmitances to imaging beam, improved resolving power.
Be depicted as the embodiment of the invention 2 as Fig. 3,4, covered the lighttight metal film 8 of one deck on quartz substrate 7, metal film is chromium, molybdenum etc., and the thickness h of metal film is (0.25～0.85) P, and wherein P is the grating cycle of grating polarization structure.Being etched with on metal film 8 needs the lines of photoetching feature pattern, according to the lines feature pattern on the mask, in mask lines feature pattern, be etched with the grating polarization structure, the grating period p of grating polarization structure is (0.25～0.5) λ, and wherein λ is the exposure wavelength of projection optics etching system; Grating cycle P specifically is defined as m λ/(n ± sin θ), and wherein m is the order of diffraction time of diffracted beam, and λ is the exposure wavelength of projection optics etching system, and n is the refractive index of the metal film narrated, and θ is an incident angle.The etching depth h of grating polarization structure is (0.25～0.85) P, and wherein P is the grating cycle of grating polarization structure, and the grating polarization structure of etching is vertical with the feature pattern line orientations of mask.Such raster polarization photomask plate not only has the function of output polarization light, it is relevant that the direction vector that can also control electric field intensity is controlled electric field space, the light distribution of imaging beam is spread along with line orientations, guaranteed that mask has enough transmitances to imaging beam, improved resolving power.
Fig. 5,6 is depicted as the embodiment of the invention 3, has covered the lighttight metal film 8 of one deck on quartz substrate 7, and metal film is chromium, molybdenum etc., and the thickness h of metal film is (0.25～0.85) P, and wherein P is the grating cycle of grating polarization structure.Being etched with on metal film 8 needs the lines of photoetching feature pattern, according to the lines feature pattern on the mask, in mask lines feature pattern, be etched with the grating polarization structure, the grating cycle P of grating polarization structure is (0.25～0.5) λ, and wherein λ is the exposure wavelength of projection optics etching system.Grating cycle P specifically is defined as m λ/(n ± sin θ), and wherein m is the order of diffraction time of diffracted beam, and λ is the exposure wavelength of projection optics etching system, and n is the refractive index of the metal film narrated, and θ is an incident angle.The etching depth h of grating polarization structure is (0.25～0.85) P, wherein P is the grating cycle of grating polarization structure, and on the adjacent transmission region in the light tight zone of mask features figure, be etched with the grating polarization structure of different directions, one side is etched with the parallel grating polarization structure of feature pattern line orientations, and the opposing party is etched with the vertical grating polarization structure of feature pattern line orientations.Such raster polarization photomask plate will make and see through the orthogonal linear polarization imaging beam in polarization direction on the adjacent transmission region in light tight zone, because the picture of adjacent pattern can not produce interference effect on silicon chip, so proximity effect is little, can further improve the projection optics photolithography resolution.
As shown in Figure 7, be applied to the structural representation of projection optics etching system for raster polarization photomask plate of the present invention, the illumination light that lighting source 2 sends is collected by ellipsoidal mirror 1, by lamp optical system 3, be radiated on the raster polarization photomask plate 4, feature pattern on the raster polarization photomask plate 4 produces not at the same level time diffraction imaging light beam, and the different grating polarization structures on raster polarization photomask plate 4 produce the imaging beam of different polarization direction.Imaging beam is collected also projection imaging on silicon chip 6 by light projection photoetching objective lens 5.The raster polarization photomask plate of the present invention that the projection optics etching system is used, because the grating polarization structure of the etching certain width and the degree of depth on the mask features figure, make mask plate itself have the function of output polarization light, and it is relevant to control electric field space by the direction vector of control electric field intensity, reaches the purpose that improves resolving power.The grating polarization structure will make and see through the orthogonal linear polarization imaging beam in polarization direction on the adjacent transmission region in light tight zone, then the picture of adjacent pattern can not produce interference effect on silicon chip, proximity effect is little, can further improve projection optics optical patterning photolithography resolution.
Claims (3)
1, raster polarization photomask plate, it is characterized in that: on quartz substrate, cover the lighttight metal film of one deck, on this metal film, be etched with the feature pattern that needs photoetching, according to the feature pattern on the mask, the grating polarization structure of the etching respective width and the degree of depth on the mask features figure, the grating cycle P of grating polarization structure is (0.25～0.5) λ, wherein λ is the exposure wavelength of projection optics etching system, the etching depth of grating polarization structure is identical, its value h is (0.25～0.85) P, and wherein P is the grating cycle of grating polarization structure.
2, raster polarization photomask plate according to claim 1 is characterized in that: according to the feature pattern on the mask, be etched with on the mask features figure with the parallel or vertical grating polarization structure of feature pattern line orientations; Or a side is etched with the parallel grating polarization structure of feature pattern line orientations on the adjacent transmission region in the light tight zone of mask features figure, and the opposing party is etched with the vertical grating polarization structure of feature pattern line orientations.
3, adopt the projection lithography system of the described raster polarization photomask plate of claim 1, comprise light source, ellipsoidal mirror, lighting source, lamp optical system, light projection photoetching objective lens and silicon chip, it is characterized in that: illumination optical system is unified and is added the described raster polarization photomask plate of claim between the light projection photoetching objective lens, the illumination light that lighting source sends is collected by ellipsoidal mirror, pass through lamp optical system, be radiated on the raster polarization photomask plate, feature pattern on the raster polarization photomask plate produces not at the same level time diffraction imaging light beam, and the imaging beam of the different grating polarization structures generation different polarization directions on raster polarization photomask plate, imaging beam is collected also projection imaging on silicon chip by light projection photoetching objective lens.
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| CNB2005100113320A CN100562801C (en) | 2005-02-07 | 2005-02-07 | Raster polarization photomask plate and the application in projection lithography system thereof |
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| CNB2005100113320A CN100562801C (en) | 2005-02-07 | 2005-02-07 | Raster polarization photomask plate and the application in projection lithography system thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472671A (en) * | 2012-06-05 | 2013-12-25 | 南亚科技股份有限公司 | Reticle with composite polarizer and method of simultaneous optimization of imaging of a set of different patterns |
| CN104349617A (en) * | 2013-07-30 | 2015-02-11 | 富泰华工业（深圳）有限公司 | Electronic device and manufacturing method for shell of electronic device |
| CN105607435A (en) * | 2016-03-11 | 2016-05-25 | 中国科学院微电子研究所 | Five-level diffraction grating structure and preparation method therefor, and wafer photoetching alignment method |
| CN106025776A (en) * | 2016-07-25 | 2016-10-12 | 华中科技大学 | Laser coherent beam combination coupled resonant cavity of polarization diffraction grating |
| CN108508521A (en) * | 2018-03-30 | 2018-09-07 | 武汉华星光电技术有限公司 | Polarization grating with light shield layer and preparation method thereof, array substrate, display panel, display module and terminal |
| CN108681134A (en) * | 2018-03-29 | 2018-10-19 | 上海天马微电子有限公司 | Display panel and preparation method thereof and display device |
| CN111766765A (en) * | 2020-07-16 | 2020-10-13 | 长江存储科技有限责任公司 | Alignment mark |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5459000A (en) * | 1992-10-14 | 1995-10-17 | Canon Kabushiki Kaisha | Image projection method and device manufacturing method using the image projection method |
| CN2352973Y (en) * | 1998-09-03 | 1999-12-08 | 中国科学院光电技术研究所 | Self-increasing definition type mask plate |
| US6605395B2 (en) * | 2001-06-20 | 2003-08-12 | Motorola, Inc. | Method and apparatus for forming a pattern on an integrated circuit using differing exposure characteristics |
| TWI247339B (en) * | 2003-02-21 | 2006-01-11 | Asml Holding Nv | Lithographic printing with polarized light |
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2005
- 2005-02-07 CN CNB2005100113320A patent/CN100562801C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472671A (en) * | 2012-06-05 | 2013-12-25 | 南亚科技股份有限公司 | Reticle with composite polarizer and method of simultaneous optimization of imaging of a set of different patterns |
| CN104349617A (en) * | 2013-07-30 | 2015-02-11 | 富泰华工业（深圳）有限公司 | Electronic device and manufacturing method for shell of electronic device |
| CN104349617B (en) * | 2013-07-30 | 2017-05-24 | 富泰华工业（深圳）有限公司 | Electronic device and manufacturing method for shell of electronic device |
| CN105607435A (en) * | 2016-03-11 | 2016-05-25 | 中国科学院微电子研究所 | Five-level diffraction grating structure and preparation method therefor, and wafer photoetching alignment method |
| CN105607435B (en) * | 2016-03-11 | 2017-10-24 | 中国科学院微电子研究所 | Pyatyi diffraction grating structure and preparation method thereof, wafer photolithography alignment methods |
| CN106025776A (en) * | 2016-07-25 | 2016-10-12 | 华中科技大学 | Laser coherent beam combination coupled resonant cavity of polarization diffraction grating |
| CN106025776B (en) * | 2016-07-25 | 2022-02-15 | 华中科技大学 | Laser coherent beam combination coupling resonant cavity of polarization diffraction grating |
| CN108681134A (en) * | 2018-03-29 | 2018-10-19 | 上海天马微电子有限公司 | Display panel and preparation method thereof and display device |
| CN108508521A (en) * | 2018-03-30 | 2018-09-07 | 武汉华星光电技术有限公司 | Polarization grating with light shield layer and preparation method thereof, array substrate, display panel, display module and terminal |
| CN111766765A (en) * | 2020-07-16 | 2020-10-13 | 长江存储科技有限责任公司 | Alignment mark |
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| CN100562801C (en) | 2009-11-25 |
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