WO2004023537A1 - レーザ加工方法およびレーザ加工装置 - Google Patents
レーザ加工方法およびレーザ加工装置 Download PDFInfo
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- WO2004023537A1 WO2004023537A1 PCT/JP2003/011229 JP0311229W WO2004023537A1 WO 2004023537 A1 WO2004023537 A1 WO 2004023537A1 JP 0311229 W JP0311229 W JP 0311229W WO 2004023537 A1 WO2004023537 A1 WO 2004023537A1
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Classifications
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- H—ELECTRICITY
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- 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
- H01L21/02686—Pulsed laser beam
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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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/268—Bombardment with radiation with high-energy radiation using electromagnetic radiation, e.g. laser radiation
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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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02439—Materials
- H01L21/02488—Insulating materials
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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
- H01L21/02104—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
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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
- H01L21/02104—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
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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
- H01L21/02104—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
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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
- H01L21/02104—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
- H01L21/0268—Shape of mask
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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
- H01L21/02104—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
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
Definitions
- the present invention relates to a laser processing method and a laser processing apparatus for crystallizing an amorphous material used as a semiconductor material for a semiconductor device or the like by laser beam irradiation.
- Semiconductor devices are formed on single-crystal silicon (Si), which also serves as a substrate, or on a Si thin film formed on a glass substrate. Such a semiconductor device is provided in an image sensor, an active matrix liquid crystal display device, and the like.
- a semiconductor device provided in a liquid crystal display (LCD: Liquid Crystal Display) is composed of, for example, a thin film transistor (TFT) on a transparent substrate.
- Transistor is formed by forming a regular array, and each TFT functions as a pixel controller.
- LCDs are required to have low power consumption, high response speed, brighter, and higher resolution.
- improvements in LCD performance are due to improvements in the performance of TFTs, which are pixel controllers, and especially in switching characteristics. It largely depends on the improvement.
- the switching characteristics of the TFT are improved by improving the mobility of the carrier electrons in the transistor. It is known that the electron mobility in a transistor is higher when Si, which is the material of the transistor, is crystallized than when it is amorphous. For this reason, although TFT, which is frequently used in general-purpose LCDs, is formed on an amorphous Si thin film, crystallized Si is being used instead of this amorphous Si.
- the polycrystalline structure of Si is formed, for example, by irradiating a laser beam emitted from an excimer laser to amorphous Si to melt it and crystallize Si in a solidification process.
- simply melting and solidifying Si merely results in random formation of many small crystal grains having different sizes and different crystal orientations.
- a large number of small crystal grains are formed, a large number of crystal grain boundaries forming crystal grains are formed, and these crystal grain boundaries trap electrons and act as barriers for electron transfer, resulting in crystallization.
- the effect of improving electron mobility is not sufficiently exhibited.
- the electron mobility differs for each crystal. In other words, a large number of TFTs having different operation performances are formed. Non-uniformity occurs.
- FIG. 11 is a simplified system diagram showing a configuration of a laser processing apparatus 1 used in the prior art.
- the laser processing device 1 includes an excimer laser 2 as a light source that emits a pulsed laser beam, a plurality of mirrors 3 that reflect the laser beam emitted from the excimer laser 2 and change its direction, and a variable An attenuator 4, a variable focus field lens 5, a projection mask 6 for passing the laser beam transmitted through the variable focus field lens 5 in a predetermined pattern, and a laser beam passing through the projection mask 6. It comprises an imaging lens 7 for forming an image on the sample 8 and a stage 9 on which the sample 8 can be placed and on which the sample 8 can be moved.
- a sample 8 is crystallized as follows using a laser processing apparatus 1 shown in FIG. In forming a laterally extending crystalline region in the film of semiconductor material on the substrate, which is sample 8, (a) using pulsed radiation that induces heat in the semiconductor material, Exposing one portion to melt the semiconductor material of the first portion over its thickness; and (b) solidifying the semiconductor of the first portion, at least one at a boundary portion of the first portion. Forming a first portion of the semiconductor crystal as a previous portion for the next process; and (c) step-moving from the previous portion in a step moving direction and at least one semiconductor crystal and a portion. Exposing another portion of the semiconductor which overlaps specifically; and (d) melting said another portion.
- Patent Document 1 Japanese Patent Application Laid-Open Publication No. 2000-5005 241 (pages 15 to 16;
- the above-described prior art has the following problems. Since only one exposure to one part of the semiconductor material is made with the pulsed radiation, defocusing occurs due to fluctuations in the output of the light source that emits the pulsed radiation and vibrations of the device, and the semiconductor material is filled. When sufficient heat is not induced, there is a problem that crystallization does not occur, and even if crystallization occurs, crystal grains become small.
- the area to be exposed by pulsed radiation must be mountain-shaped, or the area to be crystallized must be patterned in advance.
- the problem is that if the exposed area is mountain-shaped, the crystal will grow only to the extent of the area extending from the peak of the mountain, and if the area to be crystallized is preliminarily patterned, it will be difficult to crystallize the entire substrate. There's a problem.
- An object of the present invention is to provide a laser processing method and a laser processing apparatus capable of reliably crystallizing an amorphous material used as a semiconductor material and crystallizing an amorphous material into a desired area. It is to be.
- the present invention provides a laser processing method for crystallization of an amorphous material by irradiating a laser beam to a layer made of an amorphous material forming a substrate or a layer formed of an amorphous material on a substrate.
- a first region defined on the surface of the layer made of the amorphous material is irradiated with a laser beam to melt the amorphous material in the first region
- the region to be irradiated with the laser beam is moved by a predetermined distance in a predetermined direction in a predetermined direction, and is newly formed on the surface of the layer made of an amorphous material so as to partially overlap the immediately preceding second region.
- the present invention is characterized in that the first and second regions are formed in a rectangular shape on the surface of the layer made of the amorphous material.
- the present invention is characterized in that the first and second regions are formed in a saw-tooth shape on a surface of the layer made of the amorphous material.
- the present invention is characterized in that the first and second regions are formed in an arch shape on the surface of the layer made of the amorphous material.
- the invention is characterized in that the first region and the second region intersect. Further, the invention is characterized in that the amorphous material in a molten state in the first and / or second region is irradiated with another laser beam.
- the present invention provides a laser for crystallizing the amorphous material by irradiating a laser beam to a layer made of an amorphous material forming a substrate or a layer formed of an amorphous material over a substrate.
- a laser for crystallizing the amorphous material by irradiating a laser beam to a layer made of an amorphous material forming a substrate or a layer formed of an amorphous material over a substrate.
- a first region can be defined on the surface of the layer made of the amorphous material.
- a first projection mask provided on the optical path of the laser beam formed therebetween,
- a laser processing apparatus comprising: two projection masks.
- the laser light source emits a laser beam to be irradiated into the first region, and a second laser that emits a laser beam to be irradiated into the second region. And a light source.
- the present invention also includes another laser light source that emits a laser beam to be irradiated on the amorphous material in a molten state in the first and / or second regions,
- the wavelength of laser light emitted by another laser light source is longer than the wavelength of laser light emitted by the laser light source.
- FIG. 1 is a system diagram showing a simplified configuration of a laser processing apparatus 10 according to an embodiment of the present invention.
- FIG. 2 shows the first and second projection masks 1 provided in the laser processing apparatus 10 shown in FIG.
- FIG. 7 is a plan view showing the shapes of 7, 18;
- FIG. 3 is a cross-sectional view showing a simplified configuration of Sample 21.
- FIG. 4A to 4C are diagrams showing an outline of a crystallization process by laser beam irradiation on the a-Si film 29.
- FIG. 4A to 4C are diagrams showing an outline of a crystallization process by laser beam irradiation on the a-Si film 29.
- FIG. 5 is a plan view showing the shape of another projection mask 33.
- FIG. 6 is a plan view showing the shapes of the third and fourth projection masks 35, 36 provided in the laser processing apparatus according to the second embodiment of the present invention.
- 7A1 to 7E2 show the case where the first region 31 and the second region 32 intersect with each other.
- FIG. 9 is a diagram showing an outline of a crystallization process by laser beam irradiation on an Si film 29.
- FIG. 8 is a diagram showing the shapes of the fifth and sixth projection masks 45 and 46 in which the openings 43 and 44 are formed in an arch shape.
- FIG. 9 is a simplified view of a laser processing apparatus 50 according to a third embodiment of the present invention.
- FIG. 9 is a simplified view of a laser processing apparatus 50 according to a third embodiment of the present invention.
- FIG. 10 is a simplified system diagram showing a configuration of a laser processing apparatus 60 according to a fourth embodiment of the present invention.
- FIG. 11 is a system diagram showing a simplified configuration of a laser processing apparatus 1 used in the prior art.
- FIG. 1 is a simplified system diagram showing a configuration of a laser processing device 10 according to an embodiment of the present invention.
- FIG. 2 is a first and second projections provided in the laser processing device 10 shown in FIG.
- FIG. 3 is a plan view showing the shapes of masks 17 and 18.
- the laser processing apparatus 10 includes first and second laser light sources 11 and 12 for emitting laser beams, and laser light beams emitted from the first and second laser light sources 11 and 12 on an optical path of the laser beams.
- the first and second variable attenuators 13 and 14 and the first and second variable focal field lenses 15 and 16 and the first and second variable focal field lenses 15 and 16 are provided.
- First and second projection masks 17 and 18 for passing the laser beam respectively, an imaging lens 19, and a plurality of mirrors 20 provided to reflect the laser beam and change the optical path;
- control means 23 for performing the drive control of (2).
- first and second laser light sources 11 and 12 gas lasers of XeC1 excimer laser having a wavelength of 308 nm are used.
- Such an excimer laser is realized by, for example, Compex 301 manufactured by Lambda Physic.
- the first and second variable attenuators 13 and 14 have a function as filters capable of variably setting the transmittance of the laser beam, and the first and second laser light sources 11 and 12 The irradiance of the laser beam emitted from can be adjusted.
- the first and second variable focus field lenses 15 and 16 are lenses that focus and adjust the laser beam.
- the first and second projection masks 17 and 18 are made, for example, by patterning a chromium thin film on synthetic quartz.
- the first and first o- Rectangular first and second openings 25 and 26 are formed in the second projection masks 17 and 18, respectively.
- the first and second projection masks 17 and 18 are provided on the optical path of the laser beams emitted from the first and second laser light sources 11 and 12, respectively, and the first and second variable-focus viewing lenses 1
- the first and second regions described later are defined on the surface of the sample 21 by passing the laser beams transmitted through 5, 16 respectively.
- the imaging lens 19 forms the images of the first and second openings 25 and 26 by the laser beam on the surface of the sample 21.
- the stage 22 includes a driving unit, and can horizontally and rotationally move the sample 21 to be placed in the X-Y axis direction in a two-dimensional plane.
- FIG. 3 is a cross-sectional view showing the configuration of sample 21 in a simplified manner.
- Sample 2 1, S i 0 2 film 28 is laminated on one surface of the transparent substrate 27, an amorphous silicon (a- S i) film 29 is stacked further on the surface of the S i 0 2 film 2 8.
- the a—Si film 29 is a layer made of an amorphous material.
- the thickness of the SiO 2 film 28 is 100 nm
- the thickness of the a_Si film 29 is 50 nm.
- 5 1_Rei 2 film 28 per cent pre a- S i film 2 9 plasma E emissions Hans de chemical vapor deposition (P ECVD), such as by vapor deposition or sputtering, is laminated to the thickness of the foregoing.
- P ECVD plasma E emissions Hans de chemical vapor deposition
- the control means 23 is a processing circuit realized by a microcomputer or the like having a CPU (Central Processing Unit).
- the first and second laser light sources 11 and 12 and the stage 22 are electrically connected to the control means 23.
- the first and second laser light sources 11 and 1 are controlled by the control means 23.
- the oscillation pulse time and period of the laser beam emitted from 2 are controlled, and the drive control of stage 22, that is, the position control of sample 21 placed on stage 22 is performed.
- the control of the oscillation pulse time and cycle of the laser beam is performed by, for example, tabulating the oscillation pulse time and cycle predetermined for each crystallization processing condition of the sample 21 and controlling, for example, a RAM (Random Access Memory) in which the table is stored. This is realized by providing a control signal based on the table information read from the RAM to the first and second laser light sources 11 and 12 provided in the means 23. Also stay The drive control of the di 22 is performed based on information given to the control means 23 in advance.
- a RAM Random Access Memory
- the laser beam emitted from the first laser light source 11 according to the control signal from the control means 23 passes through the first variable attenuator 13 and the irradiance is adjusted, and passes through the first variable focus field lens 15. Then, the light passes through the first opening 25 of the first projection mask 17 and is irradiated onto the a_Si film 29 of the sample 21 by the imaging lens 19. The laser beam emitted from the first laser light source 11 and reaching the a-Si film 29 of the sample 21 passes through the first opening 25 of the first projection mask 17 as described above. By passing through, only the first region, which is rectangularly formed on the a-Si film 29, is irradiated.
- the laser beam emitted from the second laser light source 12 passes through the second variable attenuator 14, passes through the second variable focus field lens 16, and passes through the second projection mask 18.
- the light passes through the second opening 26 and is irradiated on the a-Si film 29 of the sample 21 by the imaging lens 19.
- the laser beam emitted from the second laser light source 12 and reaching the a_Si film 29 of the sample 21 passes through the second opening 26 of the second projection mask 18 as described above.
- only the inside of the second region defined on the a-Si film 29 in a rectangular shape is irradiated.
- first and second regions 31 and 32 defined on the a_Si film 29 will be described.
- the first and second openings 25 and 26 of the first and second projection masks 17 and 18 shown in FIG. 2 are formed so that the length in the short direction is 2 W.
- a—Si film 29 is imaged on the first aperture 25 to form the a—Si film.
- the second region 32 defined on the a—Si film 29 by the second opening 26 is shorter than the first region 31. It is set so that the arrangement is shifted by the distance W in the direction.
- the first and second projection masks 17 and 18 are arranged such that the first region 31 and the second region 32 defined on the a—Si film 29 are arranged as described above. They are provided on the optical paths of the laser beams emitted from the first and second laser light sources 11 and 12, respectively.
- the aforementioned distance W may be referred to as the offset amount hereinafter.
- FIG. 1 A laser processing method for irradiating the a-Si film 29, which is an amorphous material, with a laser beam for crystallization will be described below.
- 4A to 4C are diagrams showing an outline of a crystallization process by laser beam irradiation on the a-Si film 29.
- FIG. 1 A laser processing method for irradiating the a-Si film 29, which is an amorphous material, with a laser beam for crystallization will be described below.
- FIG. 1 A laser processing method for irradiating the a-Si film 29, which is an amorphous material, with a laser beam for crystallization
- FIG. 4A shows that the first region 31 defined on the surface of the a-Si film 29 is irradiated with the laser beam emitted from the first laser light source 11, and the first region 31 is irradiated with the laser beam.
- This shows a state in which a_Si in the area 31 is melted.
- the temperature gradient formed in the lateral direction is the temperature gradient formed in the longitudinal direction. Larger than. Therefore, a_Si is crystallized and crystal-grows in the short direction where the temperature gradient is large.
- the laser beam irradiation area is set to a position shifted by the offset amount W in the lateral direction of the first area 31 with respect to a—Si crystallized in the first area 31.
- a—Si melted in the second region 32 is solidified and crystallized, the portion in the short direction W overlapping with the first region 31 is melted again, Since the crystallized crystal at the remaining offset W in the first region 31 remains as a seed crystal, crystallization proceeds epitaxially from the seed crystal into the second region 32.
- FIG. 4C shows a case where a laser beam is irradiated into a first region 31 a defined on the a—Si film 29 by newly moving the sample 21, and a within the first region 31 a is This shows a state where one Si is being melted.
- the crystals crystallized in the previous second region 32 are seed crystals. From this seed crystal, crystallization proceeds epitaxially.
- the pattern It is possible to form a crystal region of a desired size in the a—Si film 29 without depending on the conditions.
- the step of melting and solidifying a-Si in each region to crystallize does not mean that solidification and crystallization of the entire region are completed. That is, the first and second laser light sources 11 and 12, which are excimer lasers, use the property of emitting a laser beam at an extremely short cycle, and solidification is progressing within the region, that is, When a part of the inside is crystallized, the next region may be irradiated with a laser beam.
- the offset amount is set to be W + SW [(W + 6 W)> W] to increase the crystallization region that can be generated per unit time, that is, increase the throughput and increase the throughput.
- the first and second regions 31 and 32 are formed by the first and second openings 25 formed in the first and second projection masks 17 and 18, respectively.
- FIG. 5 is a plan view showing the shape of another projection mask 33.
- another opening 34 formed in another projection mask 33 has a saw-tooth shape.
- the area defined on the a-Si film 29 by the projection mask 33 may have a saw-tooth shape.
- the crystal growth can be promoted by adjusting the protruding direction of the sawtooth to the preferential growth direction when a_Si is crystallized, so that the crystallized crystal in the preceding region is used as a seed crystal, When crystallizing in the next region:-it is possible to actually grow crystals.
- FIG. 5 is a plan view showing the shape of another projection mask 33.
- another opening 34 formed in another projection mask 33 has a saw-tooth shape.
- the area defined on the a-Si film 29 by the projection mask 33 may have a saw-tooth shape.
- the crystal growth can be promoted by adjusting the protruding direction of the sawtooth to the preferential growth direction when a_Si is crystallized, so that the
- FIG. 6 is a plan view showing the shape of the third and fourth projection masks 35, 36 provided in the laser processing apparatus according to the second embodiment of the present invention.
- the laser processing apparatus according to the present embodiment includes third and fourth projection masks 3 instead of the first and second projection masks 17 and 18 provided in the laser processing apparatus 10 according to the first embodiment.
- the figures and explanations are omitted because they are identical except for the use of 5, 36.
- the rectangular third and fourth openings 37, 38 formed in the third and fourth projection masks 35, 36 respectively allow the a_Si film 29 to be formed on the a_Si film 29.
- the third and fourth projection masks 35, 36 are set so that the first and second laser light sources 11 and 12 emit the laser beams so that the first and second regions defined intersect each other. It is to be provided on each optical path.
- the third and fourth projection masks 35 and 36 are provided so that the first region and the second region defined on the a-Si film 29 are orthogonal to each other.
- FIG. 7 is a diagram showing an outline of crystallization processing by laser beam irradiation on the a-Si film 29 when the first region 31 and the second region 32 intersect with each other. is there.
- Fig. 7A1 shows a first region 31 which is a laser beam irradiation region on the a-Si film 29, and
- Fig. 7A2 shows a first region 31 irradiated with the laser beam. This shows a state in which a_Si is melted, solidified and crystallized. At this time, since the first region 31 is rectangular, the crystal grains grow in the lateral direction of the first region 31.
- FIG. 7B1 shows a state where the second region 32 intersects the first region 31.
- the second area 32 has an intersection with the first area 31 at the position shifted 90 ° angularly in the direction around the axis perpendicular to the plane of FIG. It is determined that In FIG. 7B2, by irradiating the second region 32 with a laser beam, a crystal is formed in the first region 31 on an overlapping portion formed by the intersection of the first region 31 and the second region 32. This shows that large crystal grains 39 grown using the transformed crystal as a seed crystal are formed.
- FIG. 7C 1 shows that sample 21 is moved by moving stage 22 in the direction of 45 degrees with respect to any of first region 31 and second region 32, by "(2) .W".
- a new first area 31a is defined at the moved position, and FIG. 7C2 shows a new first area.
- the large crystal grains 39 formed in the overlapping portion are grown as seed crystals in a new first region 31a, and larger crystal grains 40 are formed.
- the large crystal grains 40 are grown as seed crystals in the new second region 32a to form a single layer. This shows that large crystal grains become 41.
- FIG. 7E1 the operation shown in the description of FIG. 7A1 to FIG. 7D1 is repeated, and the first areas 31, 31, 31a, 31b, 31c, 31d, 3
- the irradiation region of the laser beam formed by sequentially intersecting 1e and the second regions 32, 32a, 32b, 32c, 32d, 32e is shown.
- FIG. 7E2 shows that a large crystallization region 42 can be formed in the a-Si film 29 by forming the laser beam irradiation region as shown in FIG. 7E1.
- the crystallization region is sequentially enlarged along the periphery of the region to be crystallized, which is an overlapping region due to the intersection. Can be.
- the crystallization region is expanded in this way, the movement of the region to be crystallized by irradiation with the laser beam, that is, the movement of the sample 21 to be crystallized, is performed by sequentially moving the stage 22 in one direction. Therefore, the production efficiency of the a_Si crystallization process can be increased.
- FIG. 8 is a diagram showing the shapes of the fifth and sixth projection masks 45 and 46 in which the openings 43 and 44 are formed in an arch shape. The shapes of the first and second regions defined by crossing over the a_Si film 29 by the fifth and sixth projection masks 45 and 46 as shown in FIG. There may be.
- the crystal By aligning one of the arched curvature directions of the first and second regions with the preferential growth direction of the crystal, crystal growth is promoted when a-Si is melted and then solidified Therefore, when the crystal crystallized at the intersection of the first region and the second region is used as a seed crystal and the crystal is grown on the periphery of the seed crystal, the crystal can be grown more reliably.
- FIG. 9 is a simplified system diagram showing a configuration of a laser processing apparatus 50 according to a third embodiment of the present invention.
- the laser processing device 50 of the present embodiment is similar to the laser processing device 10 of the first embodiment, and the corresponding portions are denoted by the same reference numerals and description thereof is omitted.
- the laser processing apparatus 50 has one light source that emits a laser beam, and has only one variable attenuator that adjusts the irradiance of the laser beam emitted from the light source.
- the control means 23 controls the timing of emitting the laser beams of the first laser light source 11 and the second laser light source 12. Although the time interval for irradiating the first region 31 and the second region 32 with a laser beam is controlled by this timing control, the laser processing apparatus 50 of the present embodiment having only one light source is used. Defines the optical path difference d in the laser beam reaching the sample 21 from the first laser light source 11 and the time required to irradiate the first area 31 and the second area 32 with the optical path difference d. Control the interval.
- the optical path length of the laser beam applied to the second region 32 defined on the a-Si film 29 by the projection mask 18 is longer by the optical path difference d. Therefore, in the second region 32, the laser beam arrives with a delay of a time obtained by dividing the optical path difference d by the laser speed as compared with the first region 31.
- the time interval for irradiating the first region 31 and the second region 32 with a laser beam can be controlled.
- FIG. 10 is a simplified system diagram showing a configuration of a laser processing apparatus 60 according to a fourth embodiment of the present invention.
- Laser processing apparatus 60 of the present embodiment is similar to laser processing apparatus 50 of the third embodiment, and corresponding portions are denoted by the same reference numerals. And the description is omitted.
- the laser processing apparatus 60 another one for emitting a laser beam to be irradiated to a-Si in a molten state in the first and / or second regions 31 and 32 is provided.
- the wavelength of the laser light emitted from the other laser light source 61 is longer than the wavelength of the laser light emitted from the laser light source 11.
- an excimer laser capable of emitting laser light having an ultraviolet wavelength of 300 nm is used as the laser light source 11
- the other laser light source 61 is used as the laser light source 61.
- a laser source that emits laser light longer than the wavelength of the laser light emitted by the laser light source 11 and that has a wavelength from the visible region to the infrared region, for example, a YAG laser with a wavelength of 532 nm, a wavelength of 1064 nm A YAG laser and a carbon dioxide gas laser with a wavelength of 10.6 ⁇ m are used.
- the relatively short wavelength laser light emitted from the laser light source 11 is in a solid state rather than a molten state compared to the long wavelength laser light emitted from the other laser light source 61 a—S It has a feature that the absorption rate to the i-film 29 is high. Conversely, laser light of a relatively long wavelength emitted from the other laser light source 61 becomes more molten than solid state compared to laser light of a shorter wavelength emitted from the laser light source 11. There is a feature that the a-Si film 29 has a high absorption rate.
- the laser beam emitted from the laser light source 11 is perpendicularly incident on the sample 21 having the a-Si film 29, and the first beam having a predetermined pattern is formed.
- the images of the second projection masks 17 and 18 are irradiated onto the a-Si film 29 so as to be reduced and projected as an irradiation region of a laser beam.
- the laser beam emitted from the other laser light source 61 is obliquely incident on the sample 21 and passes through both the varifocal field lens and the projection mask. Irradiate sample 21 directly without any loss.
- the irradiation area of the laser beam emitted from the other laser light source 61 includes the first and second areas 31 and 32, and has a larger area than the first and second areas 31 and 32. It is preferable to be set to have
- the laser beam By irradiating a laser beam with a long wavelength emitted from another laser light source 61 to the first and Z or second regions 31 and 32 containing a—Si in a molten state, the laser beam is emitted. Energy is efficiently absorbed by the molten a-Si. As described above, the molten a-Si can be heated by the laser beam emitted from the other laser light source 61, and its cooling rate can be reduced, so that larger crystal grains can be grown. .
- the laser light sources 11 and 12 are excimer lasers, but are not limited thereto, and other gas lasers may be used. May be used.
- the amorphous material is a-Si, but is not limited thereto, and may be amorphous germanium selenium or the like.
- the first region overlaps the second region where a predetermined portion overlaps.
- the amorphous material is melted and solidified by irradiating a laser beam to be crystallized.
- the crystal formed in the first region is used as a seed crystal, and the crystal grains formed in the first region are inherited. Crystal can be grown. Further, the area to be irradiated with the laser beam is moved by a predetermined distance in a predetermined direction, and the second area immediately before is moved.
- a new first region is defined so as to partially overlap the region, and the crystallization process by sequentially irradiating the first region and the second region with the laser beam and moving the irradiated region is sequentially repeated.
- a crystallized region of a desired size can be generated in a layer made of an amorphous material without being restricted by a pattern Jung, etc., and a previously crystallized portion is sequentially crystallized as a seed crystal. Because they can be grown, large crystal grains can be produced.
- the first and second regions are formed in a rectangular shape on the surface of the layer made of the amorphous material, so that when the amorphous material is melted and solidified, the first and second regions are formed.
- a larger temperature gradient is formed in the short direction of the region than in the long direction.
- crystallization and crystal growth occur preferentially in the short direction where the temperature gradient is large, so that the area is larger than when the area is, for example, square and crystallized almost uniformly from four sides. Crystal grains can be generated.
- the first and second regions are formed in a sawtooth or arch shape on the surface of the layer made of the amorphous material.
- the crystallized region can be sequentially enlarged along the peripheral portion of the crystallized region, which is a superimposed region due to the intersection.
- the crystallization region is expanded in this way, the region to be crystallized by the irradiation of the laser beam can be efficiently moved, thereby increasing the production efficiency of the crystallized semiconductor material. Can be.
- the cooling rate of the amorphous material in the molten state can be reduced. This allows the amorphous material to grow into larger crystal grains during crystallization.
- the laser beam processing apparatus includes a light emitting a laser beam.
- a source a first projection mask for defining a first region on a surface of the layer made of an amorphous material, and a second projection mask for defining a second region.
- the first region is crystallized by irradiating the first region with a laser beam, and then the second region is irradiated with a laser beam to grow the crystal generated in the first region as a seed crystal. Crystal growth can be performed smoothly.
- the time interval for irradiating the first region and the second region with the laser beam can be freely set. .
- the optimal timing of laser beam irradiation on the second region can be set, so that the first region is grown on the first region for crystal growth from the seed crystal. The permissible range of a suitable area on which the second area should be superimposed is relaxed.
- another laser light source that emits a laser beam to be irradiated on the amorphous material in a molten state in the first and / or second regions.
- the laser light emitted from the laser light source is configured to have a longer wavelength than the laser light emitted from the laser light source.
- Laser light having a short wavelength is easily absorbed by an amorphous material in a solid state, and laser light having a long wavelength is easily absorbed by an amorphous material in a molten state. Therefore, by irradiating the amorphous material in the molten state with the long wavelength laser light emitted from another laser light source, the energy of the laser light is efficiently reduced to the non-melted state. Absorbed by crystalline materials. In this way, since the cooling rate of the amorphous material in the molten state can be reduced, a laser processing apparatus capable of growing larger crystal grains is realized.
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Abstract
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KR1020057003742A KR100663221B1 (ko) | 2002-09-04 | 2003-09-03 | 레이저 가공 방법 및 레이저 가공 장치 |
US10/526,855 US20060166469A1 (en) | 2002-09-04 | 2003-09-03 | Method of laser beam maching and laser beam machining apparatus |
AU2003261895A AU2003261895A1 (en) | 2002-09-04 | 2003-09-03 | Method of laser beam machining and laser beam machining apparatus |
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JP2002259318 | 2002-09-04 |
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JP (1) | JP2004119971A (ja) |
KR (1) | KR100663221B1 (ja) |
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Cited By (2)
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EP1468774A1 (en) * | 2003-02-28 | 2004-10-20 | Semiconductor Energy Laboratory Co., Ltd. | Laser irradiation method, laser irradiation apparatus, and method for manufacturing semiconductor device |
US7674663B2 (en) | 2002-10-07 | 2010-03-09 | Semiconductor Energy Laboratory Co., Ltd. | Method of irradiating laser, laser irradiation system, and manufacturing method of semiconductor device |
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US7858450B2 (en) * | 2004-01-06 | 2010-12-28 | Samsung Electronics Co., Ltd. | Optic mask and manufacturing method of thin film transistor array panel using the same |
CN100485868C (zh) * | 2004-03-31 | 2009-05-06 | 日本电气株式会社 | 半导体薄膜制造方法及装置、光束成形掩模及薄膜晶体管 |
US7820936B2 (en) * | 2004-07-02 | 2010-10-26 | Boston Scientific Scimed, Inc. | Method and apparatus for controlling and adjusting the intensity profile of a laser beam employed in a laser welder for welding polymeric and metallic components |
KR100599043B1 (ko) | 2005-03-18 | 2006-07-12 | 삼성전자주식회사 | 반도체 장치의 제조 방법 |
JP2007096244A (ja) * | 2005-08-29 | 2007-04-12 | Sharp Corp | 投影マスク、レーザ加工方法、レーザ加工装置および薄膜トランジスタ素子 |
JP2007067020A (ja) * | 2005-08-29 | 2007-03-15 | Sharp Corp | 投影マスク、レーザ加工方法、レーザ加工装置および薄膜トランジスタ素子 |
JP2007123445A (ja) * | 2005-10-26 | 2007-05-17 | Sharp Corp | レーザビーム投影マスク、レーザ加工方法、レーザ加工装置および薄膜トランジスタ素子 |
KR100928664B1 (ko) * | 2007-04-09 | 2009-11-27 | 삼성전자주식회사 | 낸드 플래시 메모리 소자의 제조 방법 |
JP2008270540A (ja) * | 2007-04-20 | 2008-11-06 | Sony Corp | 半導体装置の製造方法および表示装置 |
DE102007055530A1 (de) * | 2007-11-21 | 2009-05-28 | Carl Zeiss Ag | Laserstrahlbearbeitung |
KR101073551B1 (ko) * | 2009-11-16 | 2011-10-17 | 삼성모바일디스플레이주식회사 | 레이저 마스크 및 이를 이용한 순차적 측면 고상 결정화 방법 |
JP6679229B2 (ja) * | 2015-06-30 | 2020-04-15 | キヤノン株式会社 | 被検体情報取得装置及び光源装置 |
CN106935491B (zh) * | 2015-12-30 | 2021-10-12 | 上海微电子装备(集团)股份有限公司 | 一种激光退火装置及其退火方法 |
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- 2003-09-03 WO PCT/JP2003/011229 patent/WO2004023537A1/ja active Application Filing
- 2003-09-03 AU AU2003261895A patent/AU2003261895A1/en not_active Abandoned
- 2003-09-03 KR KR1020057003742A patent/KR100663221B1/ko not_active IP Right Cessation
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Cited By (3)
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US7674663B2 (en) | 2002-10-07 | 2010-03-09 | Semiconductor Energy Laboratory Co., Ltd. | Method of irradiating laser, laser irradiation system, and manufacturing method of semiconductor device |
EP1468774A1 (en) * | 2003-02-28 | 2004-10-20 | Semiconductor Energy Laboratory Co., Ltd. | Laser irradiation method, laser irradiation apparatus, and method for manufacturing semiconductor device |
US7700462B2 (en) | 2003-02-28 | 2010-04-20 | Semiconductor Energy Laboratory Co., Ltd | Laser irradiation method, laser irradiation apparatus, and method for manufacturing semiconductor device |
Also Published As
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JP2004119971A (ja) | 2004-04-15 |
AU2003261895A1 (en) | 2004-03-29 |
KR100663221B1 (ko) | 2007-01-02 |
KR20050057166A (ko) | 2005-06-16 |
US20060166469A1 (en) | 2006-07-27 |
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