WO2008128781A1 - Method for restructuring semiconductor layers - Google Patents
Method for restructuring semiconductor layers Download PDFInfo
- Publication number
- WO2008128781A1 WO2008128781A1 PCT/EP2008/003319 EP2008003319W WO2008128781A1 WO 2008128781 A1 WO2008128781 A1 WO 2008128781A1 EP 2008003319 W EP2008003319 W EP 2008003319W WO 2008128781 A1 WO2008128781 A1 WO 2008128781A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- intensity
- peak
- extended
- intensity peak
- semiconductor layer
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/06—Silicon
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B1/00—Single-crystal growth directly from the solid state
- C30B1/02—Single-crystal growth directly from the solid state by thermal treatment, e.g. strain annealing
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B13/00—Single-crystal growth by zone-melting; Refining by zone-melting
- C30B13/16—Heating of the molten zone
- C30B13/22—Heating of the molten zone by irradiation or electric discharge
- C30B13/24—Heating of the molten zone by irradiation or electric discharge using electromagnetic waves
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/0242—Crystalline insulating materials
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02524—Group 14 semiconducting materials
- H01L21/02532—Silicon, silicon germanium, germanium
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02656—Special treatments
- H01L21/02664—Aftertreatments
- H01L21/02667—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
- H01L21/02675—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth using laser beams
- H01L21/02678—Beam shaping, e.g. using a mask
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02656—Special treatments
- H01L21/02664—Aftertreatments
- H01L21/02667—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
- H01L21/02691—Scanning of a beam
Definitions
- the present invention relates to a process for the restructuring of semiconductor layers, in particular for the crystallization or recrystallization of an amorphous silicon layer, according to the preamble of claim 1.
- a disadvantage of such a method proves that on the one hand due to the only treated with an intensity peak of the linear intensity distribution portion of the silicon layer, the result of the recrystallization is poor. On the other hand, cracks may be generated in the substrate due to the high peak intensity of the intensity distribution.
- the problem underlying the present invention is the provision of a method of the type mentioned, which is more effective.
- the intensity profile in the direction perpendicular to the extension of the line further comprises at least one extended region which is more extensive in the direction perpendicular to the extension of the line than the intensity peak, wherein its intensity is smaller than the intensity of the intensity peak and greater than zero.
- an extended region having a smaller intensity than the intensity peak preheating of the silicon layer and the underlying substrate can be achieved, so that cracking in the substrate can be prevented.
- a thermal after-treatment of the section of the silicon layer treated with the intensity peak can be carried out, for example, by means of a second extended region running behind the intensity peak. As a result, the result of the recrystallization can be significantly improved.
- thin films of amorphous silicon can be processed on glass, which can be used in the production of thin film solar cells and flat panel production.
- FIG. 1 is a schematic plan view of a semiconductor layer to be restructured with the method according to the invention, which is arranged on a substrate, the line-shaped intensity distribution of the laser radiation being indicated;
- FIG. 2 shows a schematic side view of the semiconductor layer on the substrate according to FIG. 1;
- Intensity profile in the direction perpendicular to the extension of the line of the line intensity distribution of the laser light intensity in arbitrary units against expansion in the scanning direction
- FIG. 4 is a schematic view of the intensity profile of FIG. 3 (intensity in arbitrary units versus expansion in the scanning direction); FIG.
- Fig. 5 is a schematic view of another embodiment of an intensity profile used in the method according to the invention (intensity in arbitrary units against extension in scanning direction);
- Fig. 6 is a schematic view of another embodiment of an intensity profile used in the method according to the invention (intensity in arbitrary units against extension in scanning direction); -A-
- FIG. 7 shows a perspective view of a laser device for carrying out the method according to the invention.
- FIG. 8 shows a schematic view of a lens array and an intensity profile according to FIG. 3.
- Fig. 1 and Fig. 2 show a substrate 1, on which a silicon layer 2 is applied.
- the substrate 1 may be formed, for example, as a glass substrate.
- a linear intensity distribution 3 of the laser radiation is applied to an amorphous silicon layer 2 in the z-direction with a laser device 13 which comprises at least one semiconductor laser 14 and a micro-optics 15 for beam shaping (see FIGS. 1, 2 and 7).
- the laser device 13 operates in CW operation.
- the line of the line-shaped intensity distribution 3 extends in the y-direction.
- the line-shaped intensity distribution 3 is moved or scanned in a scanning direction 4, which corresponds to the x direction, perpendicular to the extension of the line over the silicon layer 2.
- the scanning speed can be between 1 m / min and 20 m / min.
- the line-shaped intensity distribution 3 has a comparatively small width B in the scanning direction 4 or in the x direction, which is smaller by a multiple than the length L of the line-shaped intensity distribution 3 in the longitudinal direction of the line.
- the length L of the line-shaped intensity distribution 3 may be more than 500 mm, whereas the width B may be between 0, 1 mm and 10.0 mm.
- the line-shaped intensity distribution 3 has, for example, an intensity profile 5 according to FIG. 3. This intensity profile 5 has three essential areas, namely from right to left in FIG.
- a first extended area 6 an intensity peak 7 (intensity peak) and a second extended area 8 to the right of the first extended area 6 and to the left of the second extended area 8 close in each case still a rising or falling edge 9, 10, which should be disregarded in the following description.
- FIG. 4 shows the proportions of the intensity profile 5 schematically.
- the intensity 0 is assigned to the regions arranged on the left and right of the intensity profile 5.
- the first extended region 6 has an intensity U
- the second extended region 8 has an intensity U
- the intensity peak 7 has an intensity I 7 .
- I 7 can be more than twice as large as I 8 or U.
- the power density in the extended regions 6, 8 can be between 100 W / cm 2 and 100 kW / cm 2
- the power density in the region of the intensity peak 7 can be between 1 kW / cm 2 and 1 MW / cm 2 .
- the width B 6 and Be of the first and second extended regions 6, 8 are each significantly larger than the width B 7 of the intensity peak 7.
- each section of the silicon layer becomes significantly longer with the moderate intensities I 6 , I ⁇ of the extended regions 6, 8 are irradiated as having the high intensity I 7 of the intensity peak 7.
- the width B 7 of the Intensity peak 7 smaller than 0, 1 mm (FW ⁇ 1 / e 2 )
- the widths B ⁇ and B 8 of the first and the second extended portion 6, 8 between 0, 1 mm and 10.0 mm can be large.
- the first extended region 6 of the intensity profile 5 heats the portion of the silicon layer 2 to be converted and the substrate before the intensity peak 7 supplies such a large amount of energy that the actual conversion or recrystallization can take place.
- the intensity peak 7 serves as a starting point for the conversion process.
- the second extended region 8 of the intensity profile 5 continues to supply the portion of the silicon layer 2 to be converted with a moderate amount of energy after the introduction of the peak energy amount by the intensity peak 7.
- This moderate energy supply promotes crystal growth in the silicon layer 2 and slows down the cooling of the silicon layer 2 and the substrate 1. As a result, mechanical stresses in the silicon layer 2 and in the substrate 1 can be reduced.
- FIG. 6 shows a "chair-shaped" intensity profile 12 in which only the second extended region 8 to the left of the intensity peak 7 is provided, but not the first extended area to the right of the intensity peak 7. Although such an intensity profile 12 will effect post-heating after the transformation has begun, it will not preheat before conversion.
- the semiconductor laser 14 according to FIG. 7 can be designed as a laser diode bar or as a stack of laser diode bars with a multiplicity of individual emitters, which together provide the required power and the beam parameter product necessary for the application.
- the micro-optics 15 for beam shaping comprises in the y-direction a superposition and homogenization of all emitters with the aid of cylindrical lens arrays.
- cylindrical lens arrays are used whose surface consists of multi-zone optics, for example, the intensity profile 5 of FIG. 3 allow.
- FIG. 8 shows three cylinder lenses 16, 17, 18 of such a cylindrical lens array arranged next to one another.
- the cylindrical lens array can comprise significantly more than three cylindrical lenses.
- three zones 17a, 17b, 17c are illustrated.
- the zone 17a for the formation of the first extended area 6 the zone 17b for the formation of the intensity peak 7 and the zone 17c for the formation of the second extended area 8 are responsible. This is indicated in FIG. 8 by the dashed line.
- the light of the zones 17a, 17b, 17c together with that of the zones of the other cylindrical lenses 16, 18 (or the cylindrical lenses not shown) can then be focused on different widths of different intensity.
- the light of the laser device 13 is scanned linearly over the samples with an xyz coordinate table with linear drives.
- the process parameters laser power, travel speed, sample pretreatment are adjusted so that the desired effect is achieved (recrystallization of very thin, amorphous Si coatings on glass substrates).
- Partial observed cracking in the glass substrates can be prevented by preheating (in the oven or on a hot plate) and then by laser treatment of the substrates.
- This preheating is inventively achieved optically by a corresponding adjustment of the intensity profile of the existing laser module, for example in the form of a chair profile with trailing intensity peak.
- another diode laser module with less intensity can be used which leads the line module.
- silicon thin films with increased electron mobility can also be produced reliably and inexpensively in an industrial production.
- the line shape with the intensity distribution according to the invention is the key to effective processing of thin films on glass.
- a scaling of the line length to over 500 mm and high laser powers offer new value creation possibilities for current and future tasks in the areas of display technology and photovoltaics.
- high-power diode laser sources are used with appropriate line geometry for thin-film processing. From a continuous power of one kilowatt, these line laser sources are suitable for thermal processing processes of silicon layer thicknesses of several micrometers. A more expensive large area heater can be replaced with the surface-scan method with the line-diode laser and accelerates the heating-up phase for faster and less expensive thermal processes for thin films.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200880013183.3A CN101680107B (en) | 2007-04-24 | 2008-04-24 | Method for restructuring semiconductor layers |
DE112008000934.1T DE112008000934B4 (en) | 2007-04-24 | 2008-04-24 | Process for restructuring semiconductor layers |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007019229.2 | 2007-04-24 | ||
DE102007019229 | 2007-04-24 | ||
DE102007028394.8 | 2007-06-15 | ||
DE200710028394 DE102007028394A1 (en) | 2007-06-15 | 2007-06-15 | Crystallization or re-crystallization of an amorphous silicon layer, comprises applying a semiconductor layer onto a substrate, and temporarily irradiating the semiconductor layer using a laser light of a semiconductor laser |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008128781A1 true WO2008128781A1 (en) | 2008-10-30 |
Family
ID=39563578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/003319 WO2008128781A1 (en) | 2007-04-24 | 2008-04-24 | Method for restructuring semiconductor layers |
Country Status (3)
Country | Link |
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CN (1) | CN101680107B (en) |
DE (1) | DE112008000934B4 (en) |
WO (1) | WO2008128781A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014198668A1 (en) * | 2013-06-10 | 2014-12-18 | Limo Patentverwaltung Gmbh & Co. Kg | Method for producing a scratch-resistant layer on a glass substrate |
DE102014116213A1 (en) | 2014-11-06 | 2016-05-25 | Lilas Gmbh | Device for generating laser radiation and a device for processing a workpiece |
DE102015100940A1 (en) | 2015-01-22 | 2016-07-28 | Lilas Gmbh | Method and device for producing a component with an at least partially curved surface |
US11328831B2 (en) | 2017-07-31 | 2022-05-10 | Carl Zeiss Smt Gmbh | Method for treating a reflective optical element for the EUV wavelength range, method for producing same, and treating apparatus |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58106836A (en) * | 1981-12-18 | 1983-06-25 | Hitachi Ltd | Laser annealing device |
GB2177256A (en) * | 1985-06-18 | 1987-01-14 | Sony Corp | Manufacturing crystalline thin films |
US5840118A (en) * | 1994-12-19 | 1998-11-24 | Semiconductor Energy Laboratory Co., Ltd. | Laser process system and method of using the same |
US20040232126A1 (en) * | 2001-08-09 | 2004-11-25 | Koichi Tatsuki | Laser annealing apparatus and method of fabricating thin film transistor |
US20050112850A1 (en) * | 2001-03-29 | 2005-05-26 | Semiconductor Energy Laboratory Co., Ltd. | Method of manufacturing a semiconductor device |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005129769A (en) | 2003-10-24 | 2005-05-19 | Hitachi Ltd | Method for modifying semiconductor thin film, modified semiconductor thin film, method for evaluating the same, thin film transistor formed of semiconductor thin film, and image display device having circuit constituted by using the thin film transistor |
-
2008
- 2008-04-24 CN CN200880013183.3A patent/CN101680107B/en active Active
- 2008-04-24 DE DE112008000934.1T patent/DE112008000934B4/en active Active
- 2008-04-24 WO PCT/EP2008/003319 patent/WO2008128781A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58106836A (en) * | 1981-12-18 | 1983-06-25 | Hitachi Ltd | Laser annealing device |
GB2177256A (en) * | 1985-06-18 | 1987-01-14 | Sony Corp | Manufacturing crystalline thin films |
US5840118A (en) * | 1994-12-19 | 1998-11-24 | Semiconductor Energy Laboratory Co., Ltd. | Laser process system and method of using the same |
US20050112850A1 (en) * | 2001-03-29 | 2005-05-26 | Semiconductor Energy Laboratory Co., Ltd. | Method of manufacturing a semiconductor device |
US20040232126A1 (en) * | 2001-08-09 | 2004-11-25 | Koichi Tatsuki | Laser annealing apparatus and method of fabricating thin film transistor |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014198668A1 (en) * | 2013-06-10 | 2014-12-18 | Limo Patentverwaltung Gmbh & Co. Kg | Method for producing a scratch-resistant layer on a glass substrate |
DE102014116213A1 (en) | 2014-11-06 | 2016-05-25 | Lilas Gmbh | Device for generating laser radiation and a device for processing a workpiece |
DE102015100940A1 (en) | 2015-01-22 | 2016-07-28 | Lilas Gmbh | Method and device for producing a component with an at least partially curved surface |
US11328831B2 (en) | 2017-07-31 | 2022-05-10 | Carl Zeiss Smt Gmbh | Method for treating a reflective optical element for the EUV wavelength range, method for producing same, and treating apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE112008000934A5 (en) | 2010-08-19 |
CN101680107A (en) | 2010-03-24 |
DE112008000934B4 (en) | 2022-10-27 |
CN101680107B (en) | 2013-04-10 |
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