WO2008114845A1 - Mg含有ZnO系混晶単結晶、その積層体およびそれらの製造方法 - Google Patents
Mg含有ZnO系混晶単結晶、その積層体およびそれらの製造方法 Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
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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
- 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
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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
- C30B19/00—Liquid-phase epitaxial-layer growth
- C30B19/02—Liquid-phase epitaxial-layer growth using molten solvents, e.g. flux
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- 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
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- H01L21/02403—Oxides
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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
- H01L21/02551—Group 12/16 materials
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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
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02565—Oxide semiconducting materials not being Group 12/16 materials, e.g. ternary compounds
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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
- H01L21/02612—Formation types
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- H01L21/02625—Liquid deposition using melted materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/26—Materials of the light emitting region
- H01L33/28—Materials of the light emitting region containing only elements of Group II and Group VI of the Periodic Table
- H01L33/285—Materials of the light emitting region containing only elements of Group II and Group VI of the Periodic Table characterised by the doping materials
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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
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
Definitions
- the present invention relates to a ZnO-based semiconductor material, and more particularly, to a Mg-containing ZnO-based mixed crystal single crystal having a band gap useful in the optical field and the electrical / electronic industry field, a laminate thereof, and a method for producing the same.
- Si, GaAs, GaN, etc. have been used for optoelectronic devices having various functions. Recently, light-emitting devices and electronic devices using GaN have been actively developed. On the other hand, focusing on oxides, ZnO has been used for NORISTERS, gas sensors, sunscreens, etc. Recently, optical elements, electronic elements, and piezoelectric elements have been used due to their optical characteristics, electronic element characteristics, and piezoelectric characteristics. It is attracting attention because of its application to transparent electrodes. In particular, ZnO is known to have a direct transition type 3.3-3.4 eV bandgap similar to GaN and emit 380 nm ultraviolet light, and emit short-wavelength light from blue to ultraviolet. Research and development for applications and applications for semiconductors for light-emitting elements that emit light is thriving.
- a modulation doping method as one of methods for causing charge separation by bringing semiconductors into contact with each other without applying an electric field.
- Japanese Patent Application Laid-Open No. 2005-72067 discloses that a semiconductor having a high electron concentration is converted from a semiconductor having a high electron concentration by stacking a semiconductor having a wide band gap and a high electron concentration and a semiconductor having a narrow band gap and a high electron mobility.
- a semiconductor material that satisfies both a high electron concentration and a high electron mobility due to the movement of electrons through a layer having a high mobility in which charge transfer is induced.
- the light-emitting layer must be sandwiched between an n layer and a p layer with a high band gap, which requires a ZnO-based mixed crystal single crystal with a higher band gap than ZnO.
- High crystallinity is required to demonstrate the original electronic device characteristics and optical element characteristics of ZnO-based semiconductor single crystals and their laminates.
- ZnO-based semiconductor single crystal traditional, Zn0, was allowed growth in ScAlMg0 4 and vapor phase growth method using an insulating substrate such as Safuaiya.
- a conventional method such as a notched method, a CVD method, or a PLD method has been used.
- the growth orientation of the ZnO-based semiconductor layer was the -c plane orientation.
- -For C-plane growth, acceptor Maki et al. Jpn. J. Appl. Phys. 42 (2003) 75-77
- n- type growth is relatively easy, but p-type Considering that growth is difficult,-c-plane growth has the problem that it becomes more difficult to grow p-type layers.
- the -c-plane growth film is an oxygen surface, the etching rate by acid is high and control is difficult, and etching with high flatness is difficult. Disclosure of the invention
- An object of the present invention is to solve these problems.
- the first embodiment of the present invention includes a ZnO-based semiconductor containing Mg having a band gap (Eg) of 3.30 and Eg ⁇ 3.54 eV, and has a film thickness of 5 ⁇ m or more.
- Mg-containing ZnO mixed crystal single crystal This single crystal is It has the composition represented by these.
- a preferred embodiment of the present invention is the Mg-containing ZnO mixed single crystal containing one or more selected from the group consisting of Al, Ga, In, H, and F.
- Another preferred embodiment of the present invention is the Mg-containing ZnO mixed crystal single crystal having a growth orientation of + c plane orientation.
- the second embodiment of the present invention is a laminate having a plurality of layers including a ZnO-based semiconductor containing Mg whose bandgap is (Eg) 3.30 ⁇ Eg ⁇ 3.54 eV.
- the Mg-containing ZnO mixed single crystal laminate is characterized in that the thickness of the growth layer is 5 ⁇ or more.
- a preferred embodiment of the present invention is the Mg-containing ZnO mixed single crystal containing at least one layer selected from the group consisting of the forces S, Al, Ga, In, H, and F. It is a laminate.
- Another preferred embodiment of the present invention is the Mg-containing ZnO mixed crystal single crystal laminate having a growth orientation of + c plane orientation.
- a ZnO and MgO is solute, after melted by mixing the PbO and Bi 2 0 3 as the solvent, the obtained melt directly contacting of the substrate
- the Mg-containing ZnO mixed crystal single crystal is produced by a liquid phase epitaxial growth method, characterized by growing an Mg-containing ZnO mixed crystal single crystal on a substrate.
- the Mg-containing ZnO mixed crystal single crystal according to the first embodiment of the present invention is preferably obtained by the method for producing an Mg-containing ZnO mixed crystal single crystal according to the third embodiment.
- the solute ZnO and MgO and the solvent PbF 2 and PbO are mixed and melted, and then the substrate is brought into direct contact with the obtained melt.
- An Mg-containing ZnO mixed crystal single crystal is produced by a liquid phase epitaxy method characterized by growing an Mg-containing ZnO mixed crystal single crystal on a substrate.
- the Mg-containing ZnO mixed crystal single crystal according to the first embodiment of the present invention can be suitably obtained by the method for producing an Mg-containing ZnO mixed crystal single crystal according to the fourth embodiment.
- the following aspects are also preferable in the third and fourth embodiments of the present invention. That is, an embodiment in which the Mg-containing ZnO mixed crystal single crystal contains a small amount of different elements; an embodiment in which the small amount of different elements is less than lmol%; this different elements are Li, Na, K, Cs, Rb, Be, Ca, Sr, Ba, Cu, Ag, N, P, As, Sb, Bi, B, Tl, Cl, Br, I, Mn, Fe, Co, Ni, Ti, Cd, Zr, Hf, One or more selected from the group consisting of V, Nb, Ta ⁇ Cr, Mo, W and a lanthanide element; an embodiment using a ZnO single crystal as the substrate; and the Mg-containing ZnO mixed crystal single A mode in which the substrate is removed by polishing or etching after the crystal is grown.
- an Mg-containing ZnO-based mixed crystal single crystal is grown by the method for producing an Mg-containing ZnO-based mixed crystal single crystal described in the third or fourth embodiment.
- the Mg-containing ZnO mixed crystal single crystal laminate is further characterized by further growing an Mg-containing ZnO mixed crystal single crystal on the substrate.
- the Mg-containing ZnO-based mixed crystal single crystal laminate according to the second embodiment of the present invention can be suitably obtained by the method for producing an Mg-containing ZnO-based mixed crystal single crystal laminate according to the fifth embodiment. .
- solvent refers to a substance that becomes a medium of the substance that dissolves when creating a solution.
- the Mg-containing ZnO mixed single crystal of the present invention has high crystallinity and high carrier mobility. It is possible to control the carrier while holding it as it is. In addition, since the growth film thickness can be increased to 5 ⁇ or more ', it is possible to alleviate distortion due to impurity diffusion from the substrate and lattice mismatch, and it can be used for electronic and optical elements that are expected to develop in the future. be able to. Brief Description of Drawings
- FIG. 1 is a configuration diagram showing a conventional element structure and an element structure using an Mg-containing ZnO mixed single crystal as an example of the present invention.
- FIG. 2 is a block diagram of the furnace used in the examples and comparative examples of the present invention.
- the first embodiment of the present invention includes a ZnO-based semiconductor containing Mg whose bandgap (Eg) is 3.30 and Eg ⁇ 3.54 eV, and has a thickness of 5 // m or more.
- This is a Mg-containing ZnO mixed single crystal that is characterized. Since the ZnO-based mixed crystal single crystal having the above structure has a film thickness of 5 / m or more, it is possible to reduce distortion due to impurity diffusion from the substrate and the mismatch between the substrate and the growth film. Become.
- the bandgap of a ZnO-based semiconductor it can be realized by mixing ZnO with MgO or BeO, but MgO is preferred in view of toxicity. If the bandgap of the ZnO mixed crystal single crystal is 3.30 eV or less, the MgO mixed crystallization rate is low, and if it exceeds 3.5 eV, the MgO single phase precipitates in addition to the ZnO mixed crystal.
- the bandgap (Eg) can be obtained by measuring the PL emission wavelength of the Mg-containing ZnO mixed single crystal obtained by the present invention and using the following equation.
- the method for measuring the PL emission wavelength is not particularly limited.
- At least one selected from the group consisting of Al, Ga, In, H and F is contained.
- one or more selected from the group consisting of Al, Ga, In, H, and F it becomes possible to develop electrical conductivity. If the substrate used for growth is removed by polishing or etching, electrodes can be formed on the front and back of the electronic element and optical element.
- the growth orientation is the + c plane orientation.
- a ZnO single crystal with a growth orientation of + c plane on a hydrothermal synthetic substrate as a substrate, it is possible to grow a ZnO-based semiconductor single crystal that is easy to incorporate an acceptor without growing into an island.
- the growth direction is + c direction, The etching speed is small and the flatness of the etched surface can be increased.
- the second embodiment of the present invention is a laminated body having a plurality of layers including a ZnO-based semiconductor containing Mg having a Pandgap (Eg) of 3.30 ⁇ Eg ⁇ 3.54 eV.
- a Mg-containing ZnO mixed crystal single crystal laminate characterized by having a layer thickness of 5 ⁇ or more.
- the number of layers can be 2 or more, but 2 layers are preferable from the viewpoint of production efficiency.
- the first growth layer on the substrate has a thickness of 5 ⁇ IB or more, which causes impurity diffusion from the substrate and lattice mismatch between the substrate and the growth film. It becomes possible to reduce the distortion based on it.
- the bandgap between the first growth layer and the second growth layer can be set arbitrarily, but considering the application of electronic devices and optical devices, the bandgap of the first growth layer and the bandgap of the second growth layer can be set.
- a gear gap is preferred.
- At least one of the plurality of layers contains one or more selected from the group consisting of Al, Ga, In, H and F.
- the group consisting of Al, Ga, In, H and F it is possible to develop electrical conductivity. If the substrate used for growth is removed by polishing, etching, etc., electrodes can be formed on the front and back when forming electronic and optical elements.
- an Mg-containing ZnO mixed crystal single crystal is produced by a liquid phase epitaxy method, characterized in that an Mg-containing ZnO mixed crystal single crystal is grown on a substrate.
- PbO: Bi 2 0 3 60 ⁇ 80mol%: 40 ⁇ 20mol ° /. It is.
- PbO or Bi 2 0 3 alone solvent since the liquid phase growth temperature is high, Pb0 + Bi 2 0 3 mixed solvent having a mixing ratio as described above are preferred.
- Solute in terms only ZnO, mixing ratio of PbO and Bi 2 0 3 as the solvent more preferably, the solute concentration is not less than 5 mol% 10 mol% or less. If the solute concentration is less than 5 mol%, the growth rate is slow, and if it exceeds 10 mol%, the growth temperature may increase.
- an Mg-containing ZnO mixed crystal single crystal is produced by a liquid phase epitaxy method, characterized in that an Mg-containing ZnO mixed crystal single crystal is grown on a substrate.
- the mixing ratio of ZnO and MgO as solute and PbF 2 and PbO as solvents is more preferable when the solute converted to ZnO alone is 5 to 10 mol%. If the solute concentration is less than 5 mol%, the effective growth rate is slow, and if it exceeds 10 mol%, the temperature at which the solute component is dissolved increases and the amount of solvent evaporation may increase.
- a liquid phase growth method is used. Unlike the vapor phase growth method, this method does not require a vacuum system. Therefore, it can produce a ZnO-based mixed crystal single crystal at a low cost and has high crystallinity because of thermal equilibrium growth. A ZnO mixed crystal single crystal can be grown. Also, by controlling the degree of supersaturation, the growth rate can be controlled and a relatively high growth rate can be realized.
- the Mg-containing ZnO mixed crystal single crystal contains a small amount of different elements.
- ZnO can change its properties by doping with different elements.
- One or more selected from the group consisting of Fe, Co, Ni, Cd, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and lanthanide elements are added.
- the addition amount is 20 mol% or less, preferably 10 mol% or less, more preferably 1 mol% or less, with respect to ZnO used as a solute.
- dissimilar elements there are p-type semiconductors, n-type semiconductors, magnetic semiconductors, conductivity control, varistor applications, and electroluminescent devices.
- a ZnO single crystal is used as the growth substrate.
- Any ZnO-based mixed crystal growth substrate can be used as long as it has a crystal structure similar to ZnO and does not react with the growth thin film.
- sapphire, LiGa0 2 , Li A10 2 , LiNb0 3 , LiTa0 3 , ScAlMg0 4 , GaN, ZnO and the like can be mentioned.
- the target single crystal in the present invention is a ZnO-based mixed crystal single crystal
- homoepitaxial growth using a ZnO substrate with a high degree of lattice matching between the substrate and the grown crystal reduces crystallinity and distortion. It is preferable in terms of reducing warpage of the grown film and reducing the amount of impurity diffusion from the substrate.
- the substrate is removed by polishing or etching. By removing the substrate, distortion due to impurity diffusion from the substrate and lattice mismatch can be alleviated. If the thickness of the first growth layer is 5 ⁇ or more, the substrate may not be removed. Further, when removing the substrate, it may be after the growth of the first growth layer or after the growth of the second growth layer. According to a fifth embodiment of the present invention, an Mg-containing ZnO-based mixed crystal single crystal is grown by the method for producing an Mg-containing ZnO-based mixed crystal single crystal described in the third or fourth embodiment.
- the Mg-containing ZnO mixed crystal single crystal laminate is further characterized by further growing an Mg-containing ZnO mixed crystal single crystal on the substrate.
- the panda gap of the first growth layer and the second growth layer can be set arbitrarily, but considering the application of electron devices and optical elements, the band gap of the first growth layer is less than the band gap of the second growth layer. preferable.
- LPE growth may be performed twice. For example, a plurality of melts having different compositions may be prepared in the growth furnace, and the laminate may be grown by moving the growth axis. Good. Alternatively, the laminate can be grown using a sliding boat method.
- the Mg-containing ZnO mixed crystal single crystal growth method in the present invention includes a liquid phase epitaxy method (LPE method), a flux method, a top seeded solution solution method (TSSG method), a solution pulling method and a sliding method.
- LPE method liquid phase epitaxy method
- TSSG method top seeded solution solution method
- the boat method can be used, but in particular, considering application to electronic elements and optical elements, a layered structure by function is used, a ZnO substrate is used! /, And liquid phase homo-epitaxial The growth method is preferred.
- one or more third components can be added to the solvent.
- B 2 0 3 , P 2 0 5 , V 2 0 5 , Mo0 3 , W0 3 , Si0 2 , BaO and the like can be mentioned.
- Bi 2 0 3 may be added as a third component to the solvent of the fourth embodiment of the present invention.
- FIG. 2 shows the configuration of the furnace used here.
- a platinum crucible 4 is provided on a crucible base 9 for melting the raw material and storing it as a melt.
- a side heater one upper heater, one central heater, and two lower heaters 3) that heat and melt the raw material in the platinum crucible 4. Yes.
- the output of the heater is controlled independently, and the heating amount for the melt is adjusted independently.
- a core tube 11 is provided between the heater and the inner wall of the manufacturing furnace, and a furnace lid 12 for opening and closing the inside of the furnace is provided above the core tube 11.
- a pulling mechanism is provided above the platinum crucible 4.
- a pulling shaft 5 is fixed to the pulling mechanism, and At the tip, a substrate holder 6 and a substrate 7 fixed by the holder are provided.
- a mechanism for rotating the pull-up shaft 5 is provided on the pull-up shaft 5.
- a thermocouple 10 for controlling the temperature of the crucible.
- the non-A1 system is suitable for the members constituting the growth furnace.
- ZnO furnace material is optimal, but considering that it is not commercially available, MgO is suitable as a material that does not work as a carrier even when mixed in a ZnO thin film.
- MgO is suitable as a material that does not work as a carrier even when mixed in a ZnO thin film.
- a quartz furnace material is also suitable.
- Kalsha, silica, Zr0 2 and zircon can also be used.
- Mg-containing ZnO mixed single crystal (represented by the composition of Z ni — x Mg x 0) was grown using a growth furnace composed of MgO and / or quartz as a non-A1 furnace material. It is preferable to make it. Furthermore, a growth furnace is provided with a crucible base for placing the crucible, a core tube provided so as to surround the outer periphery of the crucible base, a furnace lid for opening and closing the furnace inside the furnace core tube, In addition, it is preferable that the pulling shaft for moving the seed crystal or the substrate up and down is independently made of MgO or quartz.
- the temperature of the production furnace is raised until the raw material is melted.
- the temperature is raised to 800 1100 ° C, and the mixture is allowed to stand for 23 hours to stabilize the raw material melt.
- the standing time may be shortened by stirring with a Pt stirring blade.
- a ZnO single crystal was fabricated by the liquid phase epitaxial growth method by the following steps.
- Pb0 platinum crucible with inner diameter 75 ⁇ , height 75mmh, thickness 1mm, Zn0 as a raw material
- Pb0 respectively Oyopi Bi 2 0 3, 32. 94g
- the concentration of ZnO is solute in this case is 7 mol%
- the concentration of PbO and Bi 2 0 3 is a solvent
- PbO: Bi 2 0 3 66 70raol%:.
- a 33. 30 mol% The crucible charged with the raw material was placed in the furnace shown in Fig.
- the measured PL emission wavelength can be converted to the pand gap energy by the following equation.
- rpm2000 manufactured by Accent was used for the measurement method of the PL emission wavelength.
- a Mg-containing ZnO mixed single crystal film was obtained in the same manner as in Comparative Example 1 except that MgO was added as a solute to ZnO in the amount shown in Table 1 below.
- Table 1 shows the blending amount
- Table 2 shows the LPE conditions and the characteristics of the obtained film.
- Example 7 Growth film 81 8.1 24
- Eg bandgap
- the rocking curve half-width of the (002) plane is 28 to 55 arcsec, which indicates that the crystallinity is as high as that of the hydrothermal synthetic substrate (20 to 30 arcsec).
- the c-axis lattice constant of the Mg-containing ZnO mixed crystal single crystal film decreases with increasing bandgap, whereas the a-axis lattice constant hardly changes. This indicates that an Mg-containing ZnO mixed single crystal film can be grown while maintaining almost the lattice arrangement of the ZnO substrate.
- Mg-containing ZnO mixed single crystals can be produced on a substrate by liquid phase epitaxy.
- the Mg-containing ZnO mixed single crystal obtained by the present invention has high crystallinity, low electron-donating impurities seen at the carrier concentration, and high carrier mobility.
- the growth rate of the Mg-containing ZnO mixed single crystal film of the present invention is as high as 0.38 to 4.2: ni / hr, and the Mg-containing ZnO mixed single crystal film having a thickness of 5 m or more can be easily obtained. Can grow.
- the bandgap (Eg) can be controlled in the range of 3.30 ⁇ Eg ⁇ 3.5eV, and the growth film thickness can be increased to 5 ⁇ m or more. Distortion due to lattice mismatch can be reduced. Therefore, it can be expected to be used for electronic elements and optical elements that are expected to develop in the future.
- Example 2 Using the same raw material as in Example 2, set the temperature of the LPE furnace to 0. l ° C / hr during LPE growth.
- the Mg-containing ZnO mixed single crystal having a thickness of about 310 zm was obtained by lowering the temperature at a rate of 80% and setting the growth time to 80 hours.
- Table 2 shows the LPE conditions and the characteristics of the obtained film.
- the film physical properties were almost the same as Example 4 with the same formulation.
- the used substrate was removed by grinding and polishing, and an Mg-containing ZnO mixed crystal single crystal free-standing substrate having a thickness of about 280 / zm was obtained.
- Example 6 An Mg-containing ZnO mixed crystal single crystal laminate was obtained in the same manner as in Example 5, except that the self-supporting substrate obtained in Example 6 was used as the substrate.
- Table 2 shows the LPE conditions and the characteristics of the obtained film.
- the band gap ratio of the first growth layer / second growth layer is 3.38 eV / 3.54 eV.
- a ZnO single crystal was fabricated by the liquid phase epitaxial growth method by the following steps.
- a platinum crucible having an inner diameter of 75 ⁇ , a height of 75 mmh, and a thickness of 1 mm was charged with 32.94 g, 942.93 g and 858.34 g of Zn0, PbF 2 and PbO as raw materials, respectively.
- the concentration of ZnO as the solute at this time is about 5 mol%
- the solvent PbF 2 : PbO is about 50.0 mol ° /. : 50.0 mol ° /. It becomes.
- the crucible charged with the raw material was placed in the furnace shown in Fig. 2 and melted at a crucible bottom temperature of about 940 ° C.
- a Mg-containing ZnO mixed single crystal film was obtained in the same manner as in Comparative Example 2 except that MgO was added as a solute to ZnO in the amount shown in Table 3 below.
- Table 3 shows the blending amounts
- Table 4 shows the LPE conditions and the characteristics of the obtained film.
- Table 3 Compounding amounts of each component used in the production of ZnO single crystals and Mg-containing ZnO mixed single crystals
- Table 4 Growth conditions of ZnO single crystal opium Mg-containing ZnO mixed single crystal using PbF 2 + PbO solvent and characteristics of the obtained film
- Example 8 11 From the results of 1, according to the present invention, the Mg-containing ZnO system having a film thickness of 5 zm or more and a node gap (Eg) in the range of 3.30 ⁇ Eg ⁇ 3.554 eV using the LPE method. It can be seen that a mixed crystal single crystal film can be manufactured.
- the rocking carp on the (002) plane has a half-width of 28 42 arcsec, which is as high as the hydrothermal synthetic substrate (20 30 arcsec).
- the c-axis lattice constant of the Mg-containing ZnO mixed crystal single crystal film decreases as the band gap increases, while the a-axis lattice constant hardly changes. This indicates that an Mg-containing ZnO mixed single crystal film can be grown while maintaining almost the lattice arrangement of the ZnO substrate.
- MgO with a thickness of 5 Hm or more was obtained by using ZnO and MgO as solutes, mixing PbO and PbF 2 as solvents, and then bringing the substrate into direct contact with the resulting melt. It can be seen that a ZnO-based mixed crystal single crystal can be produced on a substrate by liquid phase epitaxy.
- the Mg-containing ZnO mixed single crystal obtained by the present invention has high crystallinity, low electron-donating impurities found at the carrier concentration, and high carrier mobility.
- the growth rate of the Mg-containing ZnO-based mixed crystal single crystal film of the present invention is as high as 0.35 2.20 ⁇ / 1 ⁇ ⁇ , and an Mg-containing ZnO-based mixed crystal single crystal having a thickness of 5 ⁇ or more can be easily formed. A long film can be grown.
- the band gap (Eg) can be controlled within the range of 3.30 Eg ⁇ 3.54 eV and the growth film thickness can be increased to 5 ⁇ m or more. Distortion due to lattice mismatch Can be relaxed. Therefore, it can be expected to be used in electronic and optical elements that are expected to develop in the future.
- PbO + PbF 2 has a higher carrier density.
- the carrier mobility tended to be low. This is probably because when PbF 2 is used, F is incorporated into the Z ni _ x Mg x 0 mixed crystal film, resulting in an increase in carrier density and a decrease in carrier mobility.
- the carrier concentration can be controlled by adding electron donating impurities such as A1 when Mg-containing ZnO mixed crystal single crystals are grown in liquid phase epitaxy.
- the A1-added Mg-containing mixed crystal single crystal obtained by the present invention has high crystallinity and can control the carrier while maintaining a high carrier mobility.
- the growth film thickness can be increased to 5 ⁇ or more, distortion due to impurity diffusion from the substrate and lattice mismatch can be reduced. Therefore, it can be expected to be used in electronic and optical elements that are expected to develop in the future.
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EP08722549A EP2135978A4 (en) | 2007-03-20 | 2008-03-14 | ZNO MONOCRYSTAL THAT CONTAINS MAGNESIUM (Mg), ITS LAMINATE AND METHODS OF MAKING SAME |
US12/531,513 US20100209686A1 (en) | 2007-03-20 | 2008-03-14 | Mg-CONTAINING ZnO MIXED SINGLE CRYSTAL, LAMINATE THEREOF AND THEIR PRODUCTION METHODS |
CN200880008873A CN101688325A (zh) | 2007-03-20 | 2008-03-14 | 含镁ZnO系混合单晶及其层压体和它们的制造方法 |
US13/443,124 US20120192787A1 (en) | 2007-03-20 | 2012-04-10 | Mg-CONTAINING ZnO MIXED SINGLE CRYSTAL, LAMINATE THEREOF AND THEIR PRODUCTION METHODS |
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JP2007072954A JP5260881B2 (ja) | 2007-03-20 | 2007-03-20 | Mg含有ZnO系混晶単結晶、その積層体およびそれらの製造方法 |
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EP (1) | EP2135978A4 (ja) |
JP (1) | JP5260881B2 (ja) |
KR (1) | KR20100015670A (ja) |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2439250A1 (en) * | 2009-06-04 | 2012-04-11 | Mitsubishi Gas Chemical Company, Inc. | MULTILAYER ZnO SINGLE CRYSTAL SCINTILLATOR AND METHOD FOR MANUFACTURING SAME |
WO2014002574A1 (ja) * | 2012-06-29 | 2014-01-03 | トヨタ自動車株式会社 | 半導体膜の製造方法 |
CN101986191B (zh) * | 2009-07-29 | 2014-01-15 | 中国科学院福建物质结构研究所 | 一种非线性光学晶体碘酸钒钠 |
Families Citing this family (6)
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KR20110003346A (ko) * | 2008-03-26 | 2011-01-11 | 미츠비시 가스 가가쿠 가부시키가이샤 | ZnO 단결정의 제조방법, 그것에 의해 얻어진 자립 ZnO 단결정 웨이퍼, 및 자립 Mg함유 ZnO계 혼정 단결정 웨이퍼 및 그것에 사용하는 Mg함유 ZnO계 혼정 단결정의 제조방법 |
KR101300560B1 (ko) * | 2009-07-01 | 2013-09-03 | 삼성코닝정밀소재 주식회사 | 산화아연계 전도체 |
KR101241160B1 (ko) | 2010-12-09 | 2013-03-13 | 현대자동차주식회사 | 차량의 냉난방 통풍시트 모듈 |
CN102230221B (zh) * | 2011-06-24 | 2015-07-15 | 中国科学院福建物质结构研究所 | 一种二阶非线性光学晶体碘酸铂铅 |
JP6385009B2 (ja) * | 2013-05-31 | 2018-09-05 | 日本碍子株式会社 | 酸化亜鉛自立基板及びその製造方法 |
CN112912355A (zh) * | 2018-10-31 | 2021-06-04 | 出光兴产株式会社 | 烧结体 |
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- 2008-03-14 US US12/531,513 patent/US20100209686A1/en not_active Abandoned
- 2008-03-14 EP EP08722549A patent/EP2135978A4/en not_active Withdrawn
- 2008-03-14 CN CN200880008873A patent/CN101688325A/zh active Pending
- 2008-03-14 KR KR1020097021721A patent/KR20100015670A/ko not_active Application Discontinuation
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WO2014002574A1 (ja) * | 2012-06-29 | 2014-01-03 | トヨタ自動車株式会社 | 半導体膜の製造方法 |
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KR20100015670A (ko) | 2010-02-12 |
EP2135978A4 (en) | 2010-11-17 |
TW200848556A (en) | 2008-12-16 |
EP2135978A1 (en) | 2009-12-23 |
CN101688325A (zh) | 2010-03-31 |
JP5260881B2 (ja) | 2013-08-14 |
JP2008230906A (ja) | 2008-10-02 |
US20120192787A1 (en) | 2012-08-02 |
US20100209686A1 (en) | 2010-08-19 |
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