WO2016153070A1 - サファイア部材、およびサファイア部材の製造方法 - Google Patents
サファイア部材、およびサファイア部材の製造方法 Download PDFInfo
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- WO2016153070A1 WO2016153070A1 PCT/JP2016/059900 JP2016059900W WO2016153070A1 WO 2016153070 A1 WO2016153070 A1 WO 2016153070A1 JP 2016059900 W JP2016059900 W JP 2016059900W WO 2016153070 A1 WO2016153070 A1 WO 2016153070A1
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- 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
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
- C30B33/02—Heat treatment
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- 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
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
- C30B15/14—Heating of the melt or the crystallised materials
-
- 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
- C30B29/10—Inorganic compounds or compositions
- C30B29/16—Oxides
- C30B29/20—Aluminium oxides
-
- 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
- C30B19/00—Liquid-phase epitaxial-layer growth
- C30B19/12—Liquid-phase epitaxial-layer growth characterised by the substrate
-
- 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
- C30B29/10—Inorganic compounds or compositions
- C30B29/40—AIIIBV compounds wherein A is B, Al, Ga, In or Tl and B is N, P, As, Sb or Bi
- C30B29/403—AIII-nitrides
- C30B29/406—Gallium nitride
Definitions
- the present disclosure relates to a sapphire member and a method for manufacturing the sapphire member.
- Sapphire which is a single crystal of alumina, has a crystal lattice constant close to that of gallium nitride (GaN), which is a material for LED elements, and is widely used as a growth substrate for GaN crystals for producing LED elements.
- GaN gallium nitride
- a sapphire substrate used as a substrate for GaN crystal growth is not only a substrate whose surface (main surface) is flattened with high accuracy, but also a buffer layer for suppressing dislocation defects in crystals such as GaN, for example.
- a sapphire substrate having irregularities formed on the main surface or a sapphire substrate having an appropriately roughened main surface may be used for the purpose of growth.
- Patent Document 1 discloses a sapphire substrate in which a concave portion is formed on a main surface. Patent Document 1 describes that a concave portion is formed by processing the main surface by reactive ion etching, or that the main surface is roughened by mechanical polishing using relatively coarse abrasive grains. Yes.
- the sapphire member of this embodiment has sapphire as a main component and a parallel main surface along the C-plane of the sapphire crystal.
- a plurality of terrace structure layers having a terrace surface along the C surface and a side surface in contact with an edge line of the terrace surface are located in at least a partial region of the main surface.
- the sapphire member manufacturing method includes a processing step of obtaining a base material having a main surface along the C-plane of the sapphire crystal, a heating step of heating the base material to 1800 ° C. to 2000 ° C., And a cooling step of cooling to room temperature over 6 hours.
- the method for producing a sapphire member includes a processing step for obtaining a base material having a main surface along the M-plane of a sapphire crystal, a heating step for heating the base material to 1800 ° C. to 2000 ° C., and a step after the heating step. And a cooling step for cooling to room temperature over 6 hours or more.
- (A) is a perspective view which shows typically the sapphire member of this embodiment
- (b) is sectional drawing which expands and shows a part containing the main surface of a sapphire member
- (c) is a sapphire member. It is the figure which expanded and showed a part including a main surface further.
- Example (b) is an example in which, in the heating step, the mixture was gradually cooled after being maintained at 1950 ° C. for about 40 hours.
- FIG. 7A is a photograph after the substrate of FIG. 7B is gradually cooled after being maintained at 1950 ° C. for about 5 hours in the heating step, and (b) is in the state of 1950 ° C. in the heating step. It is the photograph after cooling slowly after maintaining for about 40 hours.
- FIG. 7A is a photograph after the substrate of FIG. 7B is gradually cooled after being maintained at 1950 ° C. for about 5 hours in the heating step, and (b) is in the state of 1950 ° C. in the heating step. It is the photograph after cooling slowly after maintaining for about 40 hours.
- the surface of the concave portion or the convex portion shows a surface formed by processing, but the bottom surface of the concave portion or the top surface of the convex portion is inclined from the crystal plane of sapphire.
- the processed surface is easily displaced from the crystal plane of sapphire.
- GaN crystals are also difficult to be regularly arranged on the plane deviated from the sapphire crystal plane.
- a relatively long crystal growth time is required until a buffer layer having a surface with high crystallinity is formed.
- processing by reactive ion etching or the like requires a relatively large amount of labor and time, including the photolithography method performed before that, the sapphire substrate becomes relatively expensive.
- the sapphire substrate has properties such as high hardness and resistance to scratches, high light transmission, high resistance to various chemicals, etc., and usage methods such as storage tanks for various chemical solutions have also been proposed.
- a storage tank is formed by mechanical processing or grinding, the surface is randomly roughened, so that the scattering of visible light on the main surface of the substrate becomes too large, and the sapphire substrate The translucency is lowered.
- FIG. 1A is a perspective view schematically showing a sapphire member 1 of the present embodiment
- FIG. 1B is a cross-sectional view showing a part including the main surface 1A of the sapphire member 1 in an enlarged manner
- FIG. 1C is a diagram showing a part including the main surface 1A further enlarged.
- FIGS. 2 (a) and 2 (b), FIG. 3 (a) and FIG. 3 (b) are all examples of electron micrographs of the sapphire member 1.
- FIG. Note that the electron micrographs in the drawings are all taken using a scanning electron microscope JSM-7001F manufactured by JEOL Ltd.
- the sapphire member 1 of FIGS. 2 (a) and 2 (b), FIG. 3 (a) and FIG. 3 (b) is manufactured by one embodiment of the method for manufacturing a sapphire member of this embodiment. Specifically, a processing step for obtaining a base material having a main surface along the C-plane of the sapphire crystal, a heating step for heating the base material to 1800 ° C.
- FIG. 2A, FIG. 2B, FIG. 3A, and FIG. 3B shows a state in plan view from a direction perpendicular to the main surface 1A of the sapphire member 1. .
- the sapphire member 1 of the present embodiment includes sapphire as a main component, and includes a main surface 1A along (substantially parallel) the C plane of the sapphire crystal.
- the sapphire member 1 has at least a partial region on the C plane of the sapphire crystal.
- a plurality of terrace structure layers 10 each having a terrace surface 10 ⁇ along (substantially parallel) and a side surface 10 ⁇ in contact with the edge line 20 of the terrace surface 10 ⁇ are located.
- the sapphire member 1 according to the present embodiment has curved edges that are non-parallel (the intervals between the edge lines 20 are different) when viewed in a plan view from a direction perpendicular to the main surface 1A.
- a plurality of lines 20 are located in this region.
- the main surface 1A has moderate irregularities.
- the sapphire member 1 is used for a crystal growth substrate such as GaN
- the main surface 1A takes a relatively short time.
- a good buffer layer can be grown.
- a so-called step height having a step height of about several tens to several hundreds of angstroms A terrace structure may be formed.
- a plurality of straight ridge lines (ridge lines between the step portion and the terrace portion) extending in the direction corresponding to the inclination direction are arranged in parallel.
- the regularity of the arrangement of the ridge lines is high and the degree of unevenness is small, so in the initial stage of crystal growth Large crystal grains are likely to be formed locally, and such crystal grains may lose overall uniformity of crystal orientation, and it may take time to form a sufficiently uniform buffer layer.
- the sapphire member 1 is provided with a plurality of curved edge lines 20 that are not parallel to each other, it is difficult to form large crystal grains locally, while the terrace along the C-plane of the sapphire crystal as described above. Since the surface 10 ⁇ is provided, the crystal orientation of the buffer layer to be grown is easily aligned as a whole, and a good buffer layer can be grown in a relatively short time.
- the terrace layer structure 10 is located on the entire main surface 1A. Further, it is preferable that a plurality of non-parallel curved edge lines 20 are arranged on the entire main surface 1A.
- the some terrace layer structure 10 may be formed only in part, and the area
- the sapphire member 1 includes a plurality of terrace surfaces 10 ⁇ including a flat portion 30 larger than at least a 1 ⁇ m square. That is, since the visible light scatters less in the flat portion 30 that is larger than the square of 1 ⁇ m square that is about the wavelength of visible light, the visible light scatters through the sapphire member 1 is relatively small. For example, when the sapphire member 1 is used in a storage tank for various chemical solutions, since the light scattering is small and the visibility is high, the state of the chemical solution inside the storage tank can be easily viewed from the outside of the storage tank via the sapphire member.
- the terrace surface 10 ⁇ having a relatively large area even when the sapphire member 1 is used for a crystal growth substrate such as GaN. Since a GaN crystal having good crystallinity on the surface is easy to grow, a buffer layer having a good surface with few crystal defects and high crystallinity can be grown in a relatively short time.
- the sapphire member 1 includes a plurality of terrace surfaces 10 ⁇ each including a flat portion 60 that is larger than at least a 5 ⁇ m square.
- the flat portion 60 larger than the 5 ⁇ m square has less visible light scattering than the flat portion 30, and the visibility of light transmitted through the sapphire member 1 is high.
- a good GaN crystal is more likely to grow, so that a good buffer layer can be grown in a shorter time.
- the sapphire member 1 also includes a plurality of closed circle-shaped circle edges 21 when viewed from the direction perpendicular to the main surface 1A, and the first circle edge having a long circumference has a short circumference.
- the second circle edge is surrounded (surrounded) without intersecting. That is, the sapphire member 1 has a shape in which a protruding convex portion 40 having a stepped surface and a hole-shaped concave portion 50 having a stepped surface are located.
- the buffer layer having high crystallinity can be grown in a relatively short time.
- the terrace surface 10 ⁇ having the second circle edge with a short circumference is disposed above the terrace surface 10 ⁇ having the first circle edge with a long circumference. Further, in the hole-shaped recess 50, the terrace surface 10 ⁇ having the first circle edge having a long circumference is disposed above the terrace surface 10 ⁇ having the second circle edge having a short circumference.
- Both the convex part 40 and the concave part 50 have a plurality of terrace surfaces 10 ⁇ , and the crystallinity of the grown buffer layer can be made relatively high also on the surface of the convex part 40 and the concave part 50.
- the GaN crystal or the like is consistent with the GaN crystal to be grown if the unit cell has a hexagonal column shape and the circle edge 21 has a substantially hexagonal shape. Since it is high, the crystallinity of the grown buffer layer can also be made relatively high in this respect. Further, when each side of the hexagonal circle edge 21 is along the M plane of the sapphire crystal (substantially parallel), each side of the hexagonal shape is substantially parallel to each side of the sapphire member 1 that is a growth substrate. Therefore, even in the convex portion 40 and the concave portion 50, the consistency with the GaN crystal grown while crystal matching with the sapphire member 1 is high, and the crystallinity of the growing buffer layer can be made relatively high.
- FIG. 4 is an example of a flowchart of the method for manufacturing a sapphire member of the present invention.
- the flowchart shown in FIG. 4 corresponds to the embodiment for manufacturing the sapphire member 1 described above, and also corresponds to other embodiments described later.
- a plate-like body mainly composed of sapphire is prepared.
- the plate-like body mainly composed of sapphire is made of sapphire, which is an alumina single crystal grown by a crystal growth method such as EFG method.
- the method for growing sapphire, which is an alumina single crystal is not particularly limited, and may be a chiloporous method, a HEM method, or the like.
- a plate-like body mainly composed of sapphire is processed so that, for example, the arithmetic average roughness Ra is 0.1 ⁇ m or more to obtain a base material having a main surface along the C plane of the sapphire crystal. It includes a processing step, a heating step for heating the substrate to 1800 ° C. to 2000 ° C., and a cooling step for cooling to room temperature over 6 hours after the heating step.
- the surface of a plate-shaped body mainly composed of sapphire is ground using a surface grinder or the like that mechanically grinds the workpiece by sliding the workpiece on the surface of a moving grindstone.
- a base material having a main surface substantially parallel to the C-plane of the sapphire crystal is obtained.
- the main surface after machining such as a surface grinder is a surface in which sapphire having a very high hardness is machined out by mechanical machining, and the arithmetic average roughness Ra is 0. .1 ⁇ m or more and relatively large (surface is rough).
- FIG. 5 (a) and FIG. 5 (b) are electron micrographs of the main surface of the substrate immediately after the processing step.
- FIG. 5A shows an example in which a resin diamond plate is used as a polishing pad of a surface grinder
- FIG. 5B shows an example in which a cast iron plate is used as a polishing pad of a surface grinder.
- FIG. 5A shows an example of polishing (grinding) in 0.05 mm / traverse mode using a resin diamond plate # 325 as a polishing plate and using a surface grinding apparatus manufactured by Mitsui High-Tech. It is.
- FIG. 5A shows an example of polishing (grinding) in 0.05 mm / traverse mode using a resin diamond plate # 325 as a polishing plate and using a surface grinding apparatus manufactured by Mitsui High-Tech. It is.
- FIG. 5A shows an example of polishing (grinding) in 0.05 mm / traverse mode using a resin diamond plate # 325 as a polish
- 5B shows an example in which a cast iron plate is used as a polishing plate and polishing is performed in a self-weight mode by a lapping apparatus manufactured by Kyoritsu Seiki Co., Ltd. using a diamond slurry having an average particle size of 25 ⁇ m.
- FIG. 5A is an electron micrograph (photo just after the processing step) in the manufacturing process of the sapphire member 1 shown in FIGS. 2A and 2B, and FIG. It is an electron micrograph in the manufacturing process of the sapphire member 1 shown to 3 (a) and (b) (photograph immediately after a process process).
- sapphire which is a single crystal of alumina
- FIGS. 5 (a) and 5 (b) photograph immediately after a process process
- a heating step of heating the base material (worked body) in such a processing step to 1800 ° C. to 2000 ° C., and a cooling step of cooling to room temperature over 6 hours after the heating step are performed.
- the heating step and the slow cooling step are performed by placing the processed substrate in a heating furnace having a rare gas atmosphere.
- the processed base material is placed in the chamber of the heating furnace, and the inside of the chamber is replaced with argon (Ar) gas which is a rare gas. Thereafter, the temperature in the chamber is gradually raised to 1950 ° C. over about 14 (hours) and maintained at 1950 ° C. for about 5 to 50 hours.
- the melting point of sapphire is about 2070 ° C.
- the base material is heated to a temperature close to the melting point of sapphire and maintained for a long time. By this heating step, the outermost surface portion of the base material made of sapphire becomes easy to move in atomic units, such as a part of which melts, and rearrangement of atomic positions proceeds.
- the temperature is lowered to room temperature over 6 hours.
- crystallization of the outermost surface proceeds. That is, the crystal part mechanically destroyed by the processing step is recrystallized so as to correspond to the crystal part below the destroyed part.
- fine cracks and the like formed by breaking the crystals are further flattened.
- FIG. 6 is a diagram showing the crystal structure of a sapphire crystal.
- sapphire is a hexagonal system, has a C axis as its central axis, and has a C plane perpendicular to the C axis.
- Six plane portions that are hexagonal outer surfaces parallel to the C-axis are M-planes.
- the terrace structure layer 10 having a terrace surface 10 ⁇ parallel to the C surface of the sapphire crystal and a side surface 10 ⁇ in contact with the terrace surface 10 ⁇ gradually grows.
- the main surface of the base material is substantially parallel to the C-plane of the sapphire crystal, a large crystal plane easily grows in this main surface in a direction parallel to the C-plane of the sapphire crystal, and is a flat portion larger than at least a 1 ⁇ m square.
- the larger terrace surface 10 ⁇ is formed.
- the M-plane of the sapphire crystal that is perpendicular to the C-plane of the sapphire crystal is also a plane on which the crystal plane is relatively easy to come out (the crystals are easily aligned), so the side surface 10 ⁇ that is perpendicular to the C-plane of the sapphire crystal also has some degree. It is considered that the edge line 20 is clearly formed because the growth easily proceeds with the size of.
- each of the terrace surfaces 10 ⁇ is provided with a non-parallel curved edge line 20 and is a flat portion 30 larger than at least a square of 1 ⁇ m square.
- a plurality of terrace surfaces 10 ⁇ in which a plurality of edge lines 20 of a plurality of other stacked terrace structure layers 10 are arranged are in a state of being arranged in a plurality.
- the sapphire member 1 can be manufactured through such a process.
- the sapphire member 1 shown in FIGS. 2 (a) and 2 (b) is an example in which a diamond resin plate is used as a polishing pad in the processing step, and FIG. 2 (a) is 1950 ° C. in the heating step.
- FIG. 2 (b) shows an example in which the sample was gradually cooled after being maintained at 1950 ° C. for about 40 hours in the heating step.
- the sapphire member 1 shown to Fig.3 (a) and FIG.3 (b) is an example at the time of using a cast iron plate as a polishing pad in a processing process, Fig.3 (a) is 1950 degreeC in a heating process.
- FIG. 3B shows an example in which the sample is gradually cooled after being maintained at 1950 ° C. for about 40 hours in the heating step.
- the heating time is longer (examples of FIG. 2B and FIG. 3B) than for the heating time shorter (examples of FIG. 2A and FIG. 3A) of the terrace surface 10 ⁇ .
- the size is large.
- the size of the convex portion 40 and the concave portion 50 is larger when the heating time is longer and the shape is closer to a hexagon. That is, the longer the heating time, the larger the growth of the M plane.
- the temperature in the heating step is not limited to 1950 ° C., it is preferably 1800 ° C. or higher in order to relatively increase the size of the terrace surface 10 ⁇ .
- the atmosphere in the heating furnace is not limited, but in order to make the terrace surface 10 ⁇ relatively large, the processed substrate is placed in a rare gas atmosphere such as argon (Ar) gas, and a heating process and a slow cooling process are performed. It is preferable to implement.
- the sapphire member 1 manufactured by the manufacturing method of this embodiment can be suitably used for a substrate for GaN crystal growth, for example.
- the unevenness can be formed by simply placing the base material to be the sapphire member 1 in the heating furnace after processing without passing through processes such as photolithography and reactive ion etching after processing.
- the sapphire member 1 having a surface on which a plurality of non-parallel curved edge lines 20 are arranged can be formed. By using this sapphire member 1, for example, high crystallinity is obtained.
- the buffer layer can be formed in a short time.
- CMP polishing since it is not necessary to perform so-called CMP polishing, it is possible to suppress excessive wear (so-called surface sag) of the main surface end that is likely to occur in CMP polishing or the like.
- a plate-like body containing sapphire as a main component is processed so that, for example, the arithmetic average roughness Ra is 0.1 ⁇ m or more, and the main surface along (substantially parallel) the M plane of the sapphire crystal.
- the second embodiment differs from the above-described embodiment only in that the main surface of the base material obtained in the processing step is an M-plane, and the conditions in other steps are the same as in the previous embodiment. It is the same.
- sapphire is the main component.
- the base material which has a main surface substantially parallel to the M surface of a sapphire crystal is obtained by grinding the surface of the plate-shaped body to perform.
- the main surface formed by machining has a relatively large arithmetic average roughness Ra of 0.1 ⁇ m or more (the surface is rough).
- Table 1 shows data obtained as a result of an experiment for confirming the ease of generation of particles for each of the sapphire member of the first embodiment and other sapphire members.
- the “first embodiment” in Table 1 corresponds to the sapphire member 1 shown in FIG. That is, the “first embodiment” is an example in which a cast iron plate is used as a polishing pad in the processing step, and is gradually cooled after being maintained at 1950 ° C. for about 5 hours in the heating step.
- “Other sapphire” in Table 1 corresponds to the sapphire member shown in FIG. That is, “other sapphire” is not subjected to the heating and slow cooling steps after the polishing step.
- the “number of particles” in Table 1 is a numerical value measured using a light scattering liquid particle counter (LPC: “Liquid” Particle Counter). Specifically, a sample was placed in 5 L of pure water stored in a large beaker, and ultrasonic cleaning was performed by applying ultrasonic waves to the pure water. With respect to this pure water after ultrasonic cleaning, the total number of particles having a diameter of 0.2 ⁇ m or more released from the sample was measured using CLS-700T manufactured by PMS, which is an LPC device. Each measurement target sample (“first embodiment” and “other sapphire”) was prepared, and the same measurement was performed for all the measurement target samples.
- LPC light scattering liquid particle counter
- FIG. 7 (a) and 7 (b) are electron micrographs of the surface of the main surface substantially parallel to the M-plane immediately after the processing step of the second embodiment.
- FIG. 7A shows an example in which a diamond resin plate is used as a polishing pad of a surface grinder
- FIG. 7B shows an example in which a cast iron plate is used as a polishing pad of a surface grinder.
- sapphire which is a single crystal of alumina, is mechanically destroyed and very fine cracks and There are countless cracks.
- a heating step of heating the processed base material (processed body) to 1800 ° C. to 2000 ° C. and a cooling step of cooling to room temperature over 6 hours after the heating step are performed.
- the heating step and the slow cooling step are performed by placing the processed substrate in a heating furnace in a rare gas atmosphere.
- the processed base material is placed in the chamber of the heating furnace, and the inside of the chamber is replaced with argon (Ar) gas which is a rare gas. Thereafter, the temperature in the chamber is gradually raised to 1950 ° C. over about 14 (hours) and maintained at 1950 ° C. for about 5 to 50 hours. After such a heating step, the temperature is lowered to room temperature over 6 hours. In this way, by gradually cooling over a long time, crystallization of the outermost surface proceeds.
- Ar argon
- FIG. 9 (a) and FIG. 9 (b) are electron micrographs of the main surface parallel to the M-plane of the sapphire crystal after the slow cooling step.
- 8 (a) and 8 (b) are photographs after the heating step and the slow cooling step are performed on the substrate of FIG. 7 (a), and FIG. 8 (a) is 1950 ° C. in the heating step.
- FIG. 8B shows an example in which the sample is gradually cooled after being maintained at 1950 ° C. for about 40 hours in the heating step.
- 9 (a) and 9 (b) are photographs after the heating step and the slow cooling step are performed on the substrate of FIG. 7 (b), and FIG. 9 (a) is 1950 ° C. in the heating step.
- FIG. 9B shows an example in which the sample was gradually cooled after being maintained at 1950 ° C. for about 40 hours in the heating step.
- the crystal part mechanically destroyed by the processing step is recrystallized so as to correspond to the crystal part below the destroyed part.
- fine cracks and the like formed by breaking the crystals are further flattened.
- the boundary of the crystal layer such as the edge line 20 cannot be confirmed, and a plane parallel to the M plane is formed with very few irregularities. This is considered to be because the crystal orientation of the M plane of the sapphire crystal layer is easily aligned as compared with other crystal layers such as the C plane of the sapphire crystal.
- the temperature maintenance time in the heating process is sufficiently flattened if it is about 5 hours. It can be seen that even if the temperature maintenance time in the heating step is about 40 hours, there is no significant change in the surface roughness.
- the arithmetic average roughness (Ra) of the sapphire member shown in FIG. 8A is 0.25 ( ⁇ m), and the main surface flattened with high accuracy is obtained by the manufacturing method of the second embodiment. ing.
- a sapphire member having a relatively flat main surface parallel to the M-plane can be manufactured at a low cost with relatively little effort and time.
- Sapphire has a high hardness.
- CMP Chemical Mechanical Polishing
- the heating step and the slow cooling step can be performed by the heating furnace only with the effort of disposing the sapphire member in the heating furnace. Since it can be flattened by one heating process and a slow cooling process, the total work time is also small.
- a sapphire member with small scattering of transmitted light can be manufactured at a relatively low cost.
- the temperature in the heating step is not limited to 1950 ° C., but is preferably 1800 ° C. or higher for flattening with high accuracy.
- the atmosphere in the heating furnace is not limited, but for flattening with high accuracy, the processed substrate is placed in a rare gas atmosphere such as argon (Ar) gas and the heating process and the slow cooling process are performed. It is preferable to do.
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Abstract
Description
1A 主面
10 テラス構造層
10α テラス面
10β サイド面
20 エッジライン
21 サークルエッジ
30、60 平坦部
40 凸部
50 凹部
Claims (10)
- サファイアを主成分とし、サファイア結晶のC面に沿った主面を備えるサファイア部材であって、
前記主面の少なくとも一部の領域に、前記C面に沿ったテラス面と、該テラス面のエッジラインに当接するサイド面とを有するテラス構造層が複数位置していることを特徴とするサファイア部材。 - 前記テラス面は、1μm四方の正方形よりも大きい平坦部を備えることを特徴とする請求項1に記載のサファイア部材。
- 前記テラス面は、5μm四方の正方形よりも大きい平坦部を備えることを特徴とする請求項2に記載のサファイア部材。
- 前記主面の平面視において、
閉曲線状のサークルエッジを備え
周の長さの長い第1サークルエッジが、
周の長さの短い第2サークルエッジを交差せずに囲繞していることを特徴とする請求項1~3のいずれかに記載のサファイア部材。 - 前記第2サークルエッジが前記第1サークルエッジより上側に位置していることを特徴とする請求項4に記載のサファイア部材。
- 前記第1サークルエッジが前記第2サークルエッジより上側に位置していることを特徴とする請求項4に記載のサファイア部材。
- 前記サークルエッジの少なくとも一つが、六角形状サークルエッジであることを特徴とする請求項4~6のいずれか記載のサファイア部材。
- 前記六角形状サークルエッジの各辺が、前記サファイア結晶のM面に沿っていることを特徴とする請求項7記載のサファイア部材。
- 請求項1~8のいずれかに記載のサファイア部材の製造方法であって、
サファイア結晶のC面に沿った主面を有する基材を得る加工工程と、
前記基材を1800℃~2000℃に加熱する加熱工程と、
該加熱工程の後、6時間以上かけて室温まで降温させる除冷工程とを有することを特徴とするサファイア部材の製造方法。 - サファイア部材の製造方法であって、
サファイア結晶のM面に沿った主面を有する基材を得る加工工程と、
前記基材を1800℃~2000℃に加熱する加熱工程と、
該加熱工程の後、6時間以上かけて室温まで降温させる除冷工程とを有することを特徴とするサファイア部材の製造方法。
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