WO2008072454A1 - 結晶質半導体膜の製造方法および半導体膜の加熱制御方法ならびに半導体結晶化装置 - Google Patents
結晶質半導体膜の製造方法および半導体膜の加熱制御方法ならびに半導体結晶化装置 Download PDFInfo
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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 at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System 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
- H01L21/2683—Bombardment with radiation with high-energy radiation using electromagnetic radiation, e.g. laser radiation using X-ray lasers
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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
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02422—Non-crystalline insulating materials, e.g. glass, polymers
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/58—After-treatment
- C23C14/5806—Thermal treatment
- C23C14/5813—Thermal treatment using lasers
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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
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
- H01L21/02356—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment to change the morphology of the insulating layer, e.g. transformation of an amorphous layer into a crystalline layer
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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
- 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 at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/324—Thermal treatment for modifying the properties of semiconductor bodies, e.g. annealing, sintering
Definitions
- Crystalline semiconductor film manufacturing method semiconductor film heating control method, and semiconductor crystallization apparatus
- the present invention relates to a method for manufacturing a crystalline semiconductor film in which an amorphous semiconductor film is crystallized by irradiating laser light, a method for controlling the heating of a semiconductor film, and a semiconductor crystallization apparatus.
- TFTs Thin Film Transistors
- Amorphous semiconductor films are irradiated with a Norlas laser beam. Melting and recrystallization (laser annealing method), and (2) solid phase growth method (solid phase growth method) where the substrate is heated in a heating furnace and the amorphous semiconductor film is grown as a solid without melting. Crystallization: SPC method) and (3) a method of growing a polysilicon film directly on a glass substrate by CVD (Chemical Vapor D mark osition) method.
- CVD Chemical Vapor D mark osition
- Patent Document 1 a method of irradiating a solid-phase grown polysilicon with a laser beam to move and capture impurities in the polysilicon film (see Patent Document 1), or a laser beam to a crystalline silicon film
- Patent Document 2 a method for improving crystallinity by reducing crystal defects in the melting and solidifying process has been proposed (see Patent Document 2).
- Patent Document 1 JP 2002-373859 A
- Patent Document 2 JP 2006-108136 A
- an organic EL (Electroluminescence) display which is regarded as a promising next-generation display instead of a liquid crystal display, increases the brightness of the screen by emitting light from the organic EL itself.
- organic EL light-emitting materials are not voltage driven but current driven, as in LCDs, the requirements for TFT are different.
- T by amorphous semiconductor In FT the threshold voltage (Vth) drifts, which is difficult to suppress over time, and the lifetime of the device is limited.
- polysilicon is a stable material and has a long life. However, with TFTs made of polysilicon, TFT characteristics vary greatly.
- TFT characteristics tends to occur when the crystal silicon crystal grain interface (grain boundary) exists in the TFT channel formation region. Variations in TFT characteristics tend to depend mainly on the crystal grain size and the number of grain boundaries existing between channels. In addition, when the crystal grain size is large, the electrolytic electron mobility generally increases. TFTs for OLED displays must have a longer TFT channel length than those with high electrolytic electron mobility, and the size of each pixel of RGB (red 'green' blue) is the TFT channel length. I can't get high resolution.
- the crystal by the solid phase growth method is the most effective crystallization method that solves the above-mentioned problems with small particle size and small TFT variation.
- the crystal shape is not constant and many defects are observed in the crystal grains.
- it is difficult to adopt for mass production with a long crystallization time.
- a batch-type heat treatment device that simultaneously treats multiple substrates is used. Since a large number of substrates are heated at the same time, it takes a long time to raise and lower the temperature, and the temperature inside the substrate tends to be uneven.
- the glass substrate since the glass substrate is heated for a long time at a temperature higher than the softening point temperature of about 600 ° C., the glass substrate itself contracts and expands and is easily damaged. Since the crystallization temperature in SPC of silicon is higher than the glass softening point temperature, the glass substrate is bent and contracted with a slight temperature distribution. As a result, even if crystallization is possible, such as an exposure process with a shallow depth of focus. The process may be hindered, making it difficult to fabricate TFT devices. In general, the crystallization rate depends on the heating temperature, and requires several tens of hours at 600 ° C, several hours at 650 ° C, and several tens of hours at 700 ° C. In order to process glass without damaging it, a long processing time is required at a temperature lower than the glass softening point, and this method is difficult to adopt for mass production.
- the glass substrate is also adversely affected by the high heating temperature.
- the method according to Patent Document 1 can remove impurities, but it is difficult to produce a uniform crystalline film with a small crystal grain size. Also
- Patent Document 2 can improve the crystallinity of the crystalline film by eliminating defects, it is difficult to produce a uniform crystalline film with a small crystal grain size.
- the size of the TFT channel formation region (channel length, channel width) has also become smaller, so a stable crystalline semiconductor film with a small average grain size can be produced uniformly throughout the substrate.
- a crystallization technique that minimizes the difference in TFT characteristics between adjacent regions.
- the present invention has been made against the background of the above circumstances, and it is possible to uniformly produce a crystalline semiconductor film having a small average grain shape such that a plurality of crystal grains may exist in a channel region of a TFT.
- An object of the present invention is to provide a method for manufacturing a crystalline semiconductor film, a semiconductor crystallization apparatus, and a semiconductor film heating control method capable of easily deriving optimum laser irradiation conditions when heating the semiconductor film.
- the first invention relates to a method for irradiating an amorphous semiconductor film on an upper layer of a glass substrate with a laser beam.
- the amorphous semiconductor film is crystallized by heating to a temperature not exceeding the melting point.
- the glass substrate having an amorphous semiconductor film as an upper layer is heated to maintain the heated state, and the amorphous substrate film on the glass substrate is maintained.
- the amorphous semiconductor film is crystallized by irradiating the semiconductor film with laser light and heating the amorphous semiconductor film to a temperature not exceeding the melting point.
- the method for producing a crystalline semiconductor film of the third aspect of the present invention is the method according to the second aspect of the present invention, wherein maintaining the heated state of the glass substrate does not exceed the softening temperature of the glass substrate. It is characterized by being made.
- a fourth aspect of the invention of a method for producing a crystalline semiconductor film of the present invention is characterized in that, in the second or third aspect of the present invention, the glass substrate is heated by heating with a heater.
- a method for producing a crystalline semiconductor film according to the second to fourth aspects of the present invention.
- the temperature is raised and maintained at a temperature while the temperature is raised to the maintenance temperature.
- a method for producing a crystalline semiconductor film according to a sixth aspect of the present invention is the method according to any one of the first to fifth aspects, wherein the laser beam is a Norlas laser such as an excimer laser oscillation device or a YAG laser oscillation device. Is a light source.
- the laser beam is a Norlas laser such as an excimer laser oscillation device or a YAG laser oscillation device. Is a light source.
- the seventh method for controlling the heating of a semiconductor film of the present invention when the semiconductor film is heated by irradiating the semiconductor film with a heating laser beam, the surface of the semiconductor film is subjected to the laser treatment. Visible light diagnostic probe laser light is incident, reflected light from the semiconductor film by the probe laser light is detected, and based on the detection result, the semiconductor film is heated at a temperature not exceeding the melting point in the laser processing. As described above, the irradiation condition of the heating laser beam is derived.
- the semiconductor crystallization apparatus of the eighth aspect of the present invention includes a heating laser light source for irradiating a semiconductor film with a heating laser beam, and a diagnosis for irradiating the semiconductor film with a visible diagnostic laser beam. And a reflected light detector for detecting reflected light of the diagnostic probe laser light reflected by the semiconductor film.
- the glass substrate can be heated and maintained at a temperature that does not cause damage. While maintaining the state, the amorphous semiconductor can be crystallized by heating for a short time at a temperature at which only the amorphous semiconductor film on the surface is not melted by laser treatment. As a result, it is possible to obtain a high-quality polycrystalline semiconductor substrate having a small crystal grain size and a uniform quality without suppressing the glass substrate displacement (deflection / deformation / internal stress) and damaging the glass substrate. Na It is also possible to crystallize the amorphous semiconductor film at a temperature below the melting point by irradiating the amorphous semiconductor film with laser light without preheating the glass substrate.
- the glass substrate is heated up to the maintenance temperature while being heated and maintained at a stepped temperature. Thereby, the temperature of the glass substrate can be made uniform and the displacement due to heating can be minimized.
- the laser light has a property of absorbing the amorphous semiconductor so that the glass substrate is not heated as much as possible.
- the laser light having an appropriate wavelength region is selected.
- the light source of the laser light is not particularly limited in the present invention, but a laser light source such as an excimer laser oscillation device or a YAG laser oscillation device is preferable.
- the glass substrate is heated and maintained before the laser light irradiation! /, So that the energy fluctuation range of the light source of the laser light can be apparently made uniform, and the Uniform temperature fluctuation for each shot of the light.
- it depends on the material of the glass substrate it is generally desirable to keep the glass substrate heated above (softening temperature: 600 ° C)! /.
- crystal defects are removed by laser irradiation, and organic substances are decomposed by laser irradiation, so that an effect of removing impurities present in the amorphous semiconductor film and contamination adhering to the surface can be obtained.
- the reflected light by the probe laser light can be detected and used for setting the irradiation condition of the laser light.
- the laser irradiation depends on the substrate temperature, semiconductor thickness, impurity content in the semiconductor, etc. Because the irradiation conditions are different, in order to obtain the optimum energy density (F) during laser heating of the semiconductor film, the value of the energy density is changed, and the semiconductor surface is irradiated for each shot, or the optimum number of times of irradiation (T) is obtained.
- the laser irradiation conditions without performing the nondestructive inspection can be determined by the method of detecting the reflectance from the semiconductor surface in real time. In other words, it is possible to control the heating of the semiconductor to a temperature not exceeding the melting point of the semiconductor!
- This method utilizes the phenomenon that the reflectivity of molten silicon is several tens of percent higher than that of solid silicon, and the reflectivity of molten silicon is from solid phase to liquid phase and from liquid phase to solid phase. Can be easily observed.
- the melting start threshold, the irradiation energy density (Fth), the melting start threshold /, and the number of irradiation times (Tth) can be easily known as the laser light irradiation conditions.
- irradiation conditions are set so that F ⁇ Fth (melting threshold Fth: irradiation energy density at the start of melting) and T ⁇ Tth (melting threshold!
- the detection of reflected light is a force that can use an appropriate photodiode or the like.
- the present invention is not limited to a specific one as long as the amount of reflected light can be measured absolutely or relatively. Good.
- the laser light source can be controlled by reflecting the laser light irradiation conditions in the heating laser light source.
- the energy density of the laser beam can be adjusted by adjusting the laser beam output or the degree of focusing.
- the method for producing a crystalline semiconductor film of the present invention it is preferable to raise the temperature of the glass substrate having the amorphous semiconductor film as an upper layer while maintaining the heated state.
- the amorphous semiconductor film on the upper layer of the substrate is irradiated with laser light, and the amorphous semiconductor film is heated to a temperature not exceeding the melting point to crystallize the amorphous semiconductor film. Crystalline semiconductor film with a small crystal grain size and uniform on the substrate that does not damage the substrate Get power S to get.
- the heating control method of a semiconductor film of the present invention when the semiconductor film is heated by irradiating the semiconductor film with a heating laser beam, the surface of the semiconductor film can be applied during the laser treatment.
- a diagnostic probe laser beam for visual light is incident, light reflected from the semiconductor film by the probe laser beam is detected, and the semiconductor film is heated at a temperature not exceeding the melting point in the laser processing based on the detection result.
- the irradiation condition of the heating laser beam is derived, the optimum irradiation condition of the laser can be easily determined, and the work is simplified and the efficiency is improved.
- a heating laser light source for irradiating the semiconductor film with the heating laser light and a heating laser light control unit for setting the irradiation conditions of the heating laser light source
- a diagnostic laser light source for irradiating the semiconductor film with a visible diagnostic probe laser beam and a reflected light detection unit for detecting the reflected light reflected by the semiconductor film from the diagnostic probe laser beam.
- the setting of the laser irradiation condition can be easily executed in response to the detection result by the reflected light detection unit. This setting can be performed by heating the semiconductor film to a temperature that does not exceed the melting point under optimum laser irradiation conditions reflected in a heating laser light source or the like.
- FIG. 1 is a longitudinal sectional view showing an excimer laser annealing apparatus used in an embodiment of the present invention.
- FIG. 2 is a diagram showing a heater pattern in the same embodiment.
- FIG. 3 is a longitudinal sectional view showing an excimer laser annealing apparatus according to another embodiment.
- FIG. 4 is a diagram showing a heater pattern in the same example.
- FIG. 5 is a scanning electron micrograph in place of a drawing, showing a crystallized semiconductor film in the same example and conventional example.
- FIG. 6 is a diagram showing the amount of reflected light by a diagnostic probe laser beam for each shot in the same other embodiment.
- the target substrate and the type of the amorphous semiconductor formed thereon are not limited thereto.
- FIG. 1 shows an excimer laser annealing apparatus 1 used in a method for manufacturing a crystalline semiconductor film according to an embodiment of the present invention. That is, the excimer laser annealing apparatus 1 has an annealing chamber (chamber 1) 2 and a KrF excimer laser generating unit 3a outside the annealing chamber 2. The upper part of the annealing chamber 2 is provided with an inward laser irradiation part 3c.
- the irradiation unit 3c is connected by a laser transmission system 3b, and the KrF excimer laser generation unit 3a, the laser transmission system 3b, and the laser irradiation unit 3c constitute a laser irradiation apparatus.
- KrF excimer laser is UV light with a wavelength of 248nm.
- a substrate mounting table 4 is disposed in the annealing chamber 2 in the laser irradiation direction of the laser irradiation unit 3c, and below the substrate mounting table 4, the substrate mounting table 4 is connected to the substrate mounting table 4.
- a heater 5 is provided as a built-in heater.
- a frame-shaped heat insulating cover 7 is disposed around the substrate mounting table 4, and the same frame-shaped reflector 6 is placed on the heat insulating cover 7 in contact with the heat insulating cover 7.
- the inner wall surface of the reflecting plate 6 is inclined inward and downward, and can reflect internal radiant heat to keep the inner side of the reflecting plate 6 at a high temperature.
- An amorphous silicon thin film 9 having a thickness of 50 nm is formed on the surface of the glass substrate 8 by a conventional method.
- the substrate 8 is mounted on the substrate mounting table 4.
- the inside of the annealing chamber 2 is set to a pressure of about atmospheric pressure, purged with nitrogen to form a nitrogen atmosphere, the heater 5 is energized, and the substrate 8 is heated by heat conduction from the substrate mounting table 4.
- the maintenance temperature that is desired to be raised to a predetermined maintenance temperature while raising the temperature of the substrate 8 at a stepwise temperature and holding it isothermally is suitably set. Is below the softening temperature of the substrate 8.
- the amorphous silicon thin film 9 is also heated by heat transfer or radiant heat (including the heat reflected by the reflector 6) as the substrate 8 is heated.
- excimer laser light generated by the excimer laser generation unit 3a is transmitted to the laser irradiation unit 3c through the excimer laser transmission system 3b, and the irradiation unit 3c is amorphous.
- Excimer laser light 10 is irradiated toward the silicon thin film 9.
- the heating temperature of the semiconductor thin film 9 is set so as not to exceed the melting point.
- cooling is preferably performed while the temperature is lowered and kept isothermal in steps.
- the resulting polycrystalline semiconductor thin film has a uniform and small crystal grain size and high quality crystallinity.
- This crystalline semiconductor film can be suitably used for an organic EL display.
- the present invention can be used as other liquid crystal displays and electronic materials whose usage is not limited to this. [0033] (Embodiment 2)
- a KrF excimer laser generator (heating laser light source) 23a is installed outside the annealing chamber 22, and the first irradiation direction of the KrF excimer laser generator 23a is the first direction.
- the half mirror 23b and the second half mirror 23c are arranged so that the laser beam reflected by the second half mirror 23c is irradiated to the laser irradiation section 23e of the annealing chamber 22 through the 10-force lens 23d.
- a substrate 8 provided with an amorphous silicon thin film 9 on the surface thereof is disposed at the tip of the irradiation direction.
- the energy meter 25a is arranged on the reflection side of the first half mirror 23b, and the output of the KrF excimer laser generator 23a can be detected, and the detection result can be displayed on the output display 25b.
- a trigger signal pipeline phototube 26 is disposed on the transmission side of the second half mirror 23c, and the detection of the laser beam output from the KrF excimer laser generator 23a can be used as a trigger signal for reflected light detection. It is possible.
- a diagnostic laser generator (diagnostic laser light source) 30 capable of irradiating visible probe laser light for diagnosis is disposed outside the annealing chamber 22.
- a probe laser beam irradiation unit 27a of the annealing chamber 22 is provided in the laser beam irradiation direction of the diagnostic laser generating unit 30, and the substrate 8 on which the semiconductor film 9 is provided on the surface is further positioned in the irradiation direction. To do.
- the reflected light from the semiconductor film 9 travels to the reflected light emitting part 27b of the annealing chamber 22 and is emitted to the outside of the annealing chamber 22, and a mirror 31a and a lens 31b are arranged in the emission direction optical path.
- a phototube type reflected light detector 32 constituted by a photodiode or the like is arranged on the front side of the optical path!
- the reflected light detector of the present invention is configured by the mirror 3 la, the lens 31 b, and the reflected light detector 32.
- the substrate 8 is placed with the amorphous silicon thin film 9 as an upper surface, and the atmosphere in the annealing chamber 22 is adjusted and not shown in the same manner as in the first embodiment.
- the substrate 8 is heated with a heating device.
- the KrF excimer laser generator 23a outputs heating excimer laser light, which is introduced into the annealing chamber 22 from the laser irradiation section 23e through the first half mirror 23b , the second half mirror 23c , and the lens 23d.
- the above excimer laser light for heating which is irradiated to the amorphous silicon thin film 9 in 22, is partially reflected by the first and first mirrors 23b and the energy is measured by the energy meter 25a, and the measurement result is output. Displayed on the display unit 25b.
- the second half mirror 23c a part of the laser light is transmitted and detected by the trigger signal piper photoelectric tube 26, and this is used as a trigger signal to operate the diagnostic laser generator 30 to transmit visible light.
- the probe laser beam 30a output from the diagnostic laser generator 30 is irradiated to the amorphous silicon thin film 9 in the annealing chamber 22 through the probe laser beam irradiation unit 27a, and is reflected by the amorphous silicon thin film 9.
- the light 30b is emitted outside the annealing chamber 22 through the reflected light emitting portion 27b. Further, the amount of the reflected light 30b is detected by the reflected light detector 32 through the mirror 31a and the lens 31b.
- the output and detection of the diagnostic laser beam are performed in real time at the same time as the heat treatment with the heating laser beam 10.
- the change in the detected light amount of the reflected light 30b is observed by changing the energy density and the number of shots of the heating laser beam by the KrF excimer laser generator 23a.
- the irradiation conditions of the heating laser beam 10 for heating the amorphous silicon thin film 9 to a temperature not exceeding the melting point can be set.
- Example 1 [0037] Examples of the present invention will be described below.
- a test material in which an amorphous silicon thin film (melting point 1200 ° C.) was formed to a thickness of 50 nm on a glass substrate was prepared.
- the temperature was raised from room temperature to 400 ° C with a heater at a heating rate of 100 ° C / min. Hold for 5 minutes. Thereafter, the temperature was raised to 500 ° C or 650 ° C at a heating rate of 50 ° C / min and held.
- the laser irradiation unit 3c irradiates the substrate 8 with pulsed excimer laser light 10 for 30 shots. did.
- the amorphous semiconductor thin film on the substrate 8 was polycrystallized by heating to 850-1000 ° C.
- Table 1 shows the measurement results of the obtained crystal grains. At each substrate temperature, and above a certain energy density, a peak of (111) orientation indicating crystallinity was obtained in X-ray diffraction.
- Fig. 5 shows SEM photographs of crystals obtained by solid phase growth obtained in this example and crystals melted and recrystallized by ordinary laser annealing. It was possible to obtain a polycrystalline semiconductor thin film with high quality and uniform polycrystallization over the entire surface with small particle size variation. Energy of at least 30mjcm— 2 or more at any substrate temperature A margin was obtained.
- a semiconductor film with small variation in TFT characteristics can be provided because a crystalline semiconductor film can be obtained uniformly with crystal grains as small as lOOnm or less.
- an amorphous silicon thin film having a silicon film thickness of 50 nm is prepared in the same manner as in the above embodiment.
- the silicon substrate temperature is set to 500 ° C.
- the irradiation energy density is set to 70
- the amount of reflected light was detected by the reflected light detector for each shot while changing at 80, 90, and lOOmj / cm 2 , and the results are shown in FIG.
- irradiation energy densities up to 90 mj / cm 2 almost no change was observed in the intensity of reflected light (noise level), but a change of about 20 mV was observed at 100 mj / cm 2 .
- the melting threshold (Fth) under this condition (substrate) is in the range of 90 mj / cm 2 ⁇ Fth ⁇ 100 mj / cm 2 and the optimum energy density (F) is 90 mj / cm 2.
- the optimum laser irradiation conditions irradiation energy density
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Cited By (2)
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CN102067285A (zh) * | 2009-05-01 | 2011-05-18 | 株式会社日本制钢所 | 结晶膜的制造方法及制造装置 |
EP2741314A3 (en) * | 2012-12-06 | 2014-07-23 | Samsung Display Co., Ltd. | Method of manufacturing a poly-crystalline silicon layer, method of manufacturing an organic light-emitting display apparatus including the same, and organic light-emitting display apparatus manufactured by using the same |
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CN102165561A (zh) * | 2008-09-25 | 2011-08-24 | 应用材料股份有限公司 | 使用十八硼烷自我非晶体化注入物的无缺陷接点形成 |
JP5594741B2 (ja) * | 2009-03-05 | 2014-09-24 | 株式会社日本製鋼所 | 結晶質膜の製造方法および結晶質膜製造装置 |
CN104392913B (zh) * | 2014-10-10 | 2017-12-22 | 京东方科技集团股份有限公司 | 准分子激光退火装置及低温多晶硅薄膜的制备方法 |
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CN106981416B (zh) * | 2017-05-17 | 2019-11-26 | 武汉华星光电技术有限公司 | 利用准分子激光退火制作低温多晶硅的系统及其承载装置 |
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EP2741314A3 (en) * | 2012-12-06 | 2014-07-23 | Samsung Display Co., Ltd. | Method of manufacturing a poly-crystalline silicon layer, method of manufacturing an organic light-emitting display apparatus including the same, and organic light-emitting display apparatus manufactured by using the same |
US9012916B2 (en) | 2012-12-06 | 2015-04-21 | Samsung Display Co., Ltd. | Organic light-emitting display apparatus |
US9202828B2 (en) | 2012-12-06 | 2015-12-01 | Samsung Display Co., Ltd. | Organic light-emitting display apparatus |
US9685326B2 (en) | 2012-12-06 | 2017-06-20 | Samsung Display Co., Ltd. | Method of manufacturing a polysilicon (poly-Si) layer |
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KR20090097145A (ko) | 2009-09-15 |
KR20110131289A (ko) | 2011-12-06 |
JP2008147487A (ja) | 2008-06-26 |
JP5004160B2 (ja) | 2012-08-22 |
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