WO2010035313A1 - 金属酸化膜の成膜方法および金属酸化膜の成膜装置 - Google Patents
金属酸化膜の成膜方法および金属酸化膜の成膜装置 Download PDFInfo
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- WO2010035313A1 WO2010035313A1 PCT/JP2008/067164 JP2008067164W WO2010035313A1 WO 2010035313 A1 WO2010035313 A1 WO 2010035313A1 JP 2008067164 W JP2008067164 W JP 2008067164W WO 2010035313 A1 WO2010035313 A1 WO 2010035313A1
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/48—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating by irradiation, e.g. photolysis, radiolysis, particle radiation
- C23C16/482—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating by irradiation, e.g. photolysis, radiolysis, particle radiation using incoherent light, UV to IR, e.g. lamps
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- 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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/40—Oxides
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- 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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/40—Oxides
- C23C16/407—Oxides of zinc, germanium, cadmium, indium, tin, thallium or bismuth
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- 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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
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- 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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/448—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials
- C23C16/452—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials by activating reactive gas streams before their introduction into the reaction chamber, e.g. by ionisation or addition of reactive species
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- 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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
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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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/46—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for heating the substrate
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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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
Definitions
- the present invention relates to a metal oxide film forming method for forming a metal oxide film on a substrate and a metal oxide film forming apparatus capable of performing the metal oxide film forming method.
- Patent Documents 1, 2, and 3 exist as techniques for forming a metal oxide film on a substrate.
- a metal oxide film is formed on a substrate by bringing a solution in which a metal salt or a metal complex is dissolved into contact with a heated substrate.
- the solution contains at least one of an oxidizing agent and a reducing agent.
- a thin film material dissolved in a volatile solvent is intermittently sprayed from above toward a thermally held substrate to form a transparent conductive film on the substrate surface.
- the intermittent spray is a high-speed pulse intermittent spray with a spray time of 100 ms or less.
- Patent Document 1 it is necessary to heat the substrate to 300 ° C. or higher, and the type of substrate used is limited, or the substrate is damaged by heat. Furthermore, the metal oxide film (zinc oxide film) formed by the technique according to Patent Document 1 also has a problem that the electric resistance value is high.
- Patent Document 2 there is a problem that a high-temperature heat treatment of the substrate is necessary as described above, and since acidic hydrogen peroxide is used as an additive, the types of metal oxide films to be formed are limited. Have the problem of becoming.
- Patent Document 3 has a problem that a high-temperature heat treatment of the substrate is necessary as in the above.
- the present invention can reduce the temperature of the heat treatment of the substrate, does not limit the type of metal oxide film to be formed, and can form a metal oxide film with a low resistance value. It is an object of the present invention to provide an oxide film forming method and a metal oxide film forming apparatus capable of performing the film forming method.
- a method for forming a metal oxide film includes (A) a step of misting a solution containing a metal, and (B) a step of heating the substrate. And (C) supplying the solution misted in the step (A) and ozone on the first main surface of the substrate in the step (B).
- a method for forming a metal oxide film comprising: (V) a step of misting a solution containing a metal; and (W) the first main surface of the substrate, A step of supplying the mist solution in step (V) and oxygen or ozone; and (X) a step of irradiating the oxygen or ozone with ultraviolet light.
- a metal oxide film forming method comprising: (V) a step of misting a solution containing a metal; and (W) a first main surface of a substrate, A step of supplying the solution misted in step (V) and oxygen or ozone; and (W) a step of converting the oxygen or ozone into plasma.
- a metal oxide film forming apparatus performs the metal oxide film forming method according to any one of claims 1 to 15.
- the metal oxide film is formed while adding ozone, active oxygen generated by decomposition of ozone by ozone and heat is rich in reactivity. Promotes decomposition and oxidation of material compounds. Thereby, a metal oxide film can be formed on the substrate even in a low-temperature heating state.
- the type of metal oxide film to be formed is not limited, and a zinc oxide film that is weak against acid or alkali can be formed.
- the metal oxide film formed by adding ozone has a large crystal grain and a texture structure. Therefore, the metal oxide film to be formed has a low sheet resistance and an excellent light confinement effect.
- the ozone (or oxygen) is supplied toward the substrate and the ozone (or oxygen) is irradiated with ultraviolet light or converted into plasma, In addition to the effect, the reaction for forming the metal oxide film on the first main surface of the substrate can be promoted. Further, the heat treatment for the substrate can be omitted or the heating temperature in the heat treatment can be suppressed.
- FIG. 1 is a diagram illustrating a configuration of a metal oxide film deposition apparatus according to Embodiment 1.
- FIG. It is a figure which shows the electron microscope observation image of the metal oxide film created on the film-forming conditions without ozone addition.
- 4 is an electron microscope observation image of a metal oxide film created by the film forming method according to Embodiment 1.
- FIG. It is a figure for demonstrating the effect of the invention which concerns on Embodiment 1.
- FIG. It is a figure which shows the electron microscope observation image of the metal oxide film created on the film-forming conditions without ozone addition.
- FIG. 4 is a diagram showing a configuration of a metal oxide film deposition apparatus according to a second embodiment.
- FIG. 6 is a diagram showing a configuration of a metal oxide film deposition apparatus according to a third embodiment.
- FIG. 10 is a diagram illustrating another configuration example of a metal oxide film deposition apparatus according to the third embodiment.
- FIG. 6 is a diagram illustrating a configuration of a metal oxide film deposition apparatus according to a fourth embodiment. It is a figure which shows the other structural example of the film-forming apparatus of the metal oxide film which concerns on Embodiment 4.
- FIG. 1 is a diagram showing a schematic configuration of a metal oxide film forming apparatus according to the present embodiment.
- a metal oxide film deposition apparatus 100 includes a reaction vessel 1, a heater 3, a solution vessel 5, a mist generator 6, and an ozone generator 7.
- the film forming apparatus 100 is subjected to a spray pyrolysis method, a pyrosol method, a mist deposition method, or the like. That is, in the film forming apparatus 100, a predetermined metal oxide film is formed on the first main surface of the substrate 2 by spraying a predetermined solution that is misted onto the first main surface of the substrate 2. be able to.
- a metal oxide film is formed on the first main surface of the substrate 2 by a predetermined reaction in the reaction vessel 1 while the substrate 2 is placed on the heater 3.
- the second main surface of the substrate 2 is placed on the heater 3.
- the first main surface of the substrate 2 described in the present specification is the main surface of the substrate 2 on the side where the metal oxide film is formed.
- substrate 2 described in this specification is a main surface of the board
- the inside of the reaction vessel 1 may be atmospheric pressure, and a metal oxide film may be formed on the substrate 2 under the atmospheric pressure, or the inside of the reaction vessel 1 may be decompressed in the range of 0.0001 to 0.1 MPa.
- a metal oxide film may be formed on the substrate 2 under the reduced pressure environment.
- a flexible substrate such as a glass substrate or a resin film, a plastic substrate, or the like used in the field of flat panel displays such as solar cells, light emitting devices, touch panels, and liquid crystal panels can be used.
- the heater 3 is a heater or the like, and can heat the substrate 2 placed on the heater 3.
- the heater 3 is heated to the metal oxide film deposition temperature by the external control unit.
- the solution container 5 is filled with a material solution (hereinafter referred to as a solution) 4 in which a metal salt, a metal complex, or a metal alkoxide compound is dissolved as a metal source.
- a material solution hereinafter referred to as a solution 4 in which a metal salt, a metal complex, or a metal alkoxide compound is dissolved as a metal source.
- the metal contained in the solution 4 is at least one of titanium (Ti), zinc (Zn), indium (In), and tin (Sn).
- the dopant source described later may not be included in the solution 4.
- the solution 4 includes boron (B), nitrogen (N), fluorine (F), magnesium (Mg), aluminum (Al), phosphorus (P), chlorine (Cl), and gallium (Ga) as dopant sources. It is preferable that at least one of arsenic (As), niobium (Nb), indium (In), and antimony (Sb) is contained.
- the solvent of the solution water, alcohol such as ethanol or methanol, a mixed solution of these liquids, or the like can be used.
- mist generator 6 for example, an ultrasonic atomizer can be employed.
- the mist generator 6 that is the ultrasonic atomizing device applies the ultrasonic wave to the solution 4 in the solution container 5 to mist the solution 4 in the solution container 5.
- the mist-ized solution 4 is supplied toward the first main surface of the substrate 2 in the reaction vessel 1 through the path L1.
- Ozone generator 7 can generate ozone.
- the ozone generated by the ozone generator 7 is supplied toward the first main surface of the substrate 2 in the reaction vessel 1 through a path L2 different from the path L1.
- a high voltage is applied between parallel electrodes arranged in parallel, and oxygen molecules are decomposed by passing oxygen between the electrodes, thereby generating ozone by combining with other oxygen molecules. Can be made.
- the ozone reacts with the solution 4 on the substrate 2 being heated, and a predetermined metal is formed on the first main surface of the substrate 2.
- An oxide film is formed.
- the metal oxide film to be formed is a transparent conductive film such as indium oxide, zinc oxide, or tin oxide, depending on the type of the solution 4. Further, the ozone and the solution 4 that have not reacted in the reaction vessel 1 are always (continuously) discharged out of the reaction vessel 1 through the path L3.
- the solution 4 is misted by the mist generator 6.
- the mist solution 4 is supplied to the reaction vessel 1 through the path L1.
- ozone is generated by the ozone generator 7.
- the generated ozone is supplied to the reaction vessel 1 through the path L2.
- the substrate 2 placed on the heater 3 is heated to the metal oxide film deposition temperature by the heater 3, and the temperature of the substrate 2 is maintained at the metal oxide film deposition temperature. Yes.
- Ozone and mist solution 4 are supplied to the first main surface of substrate 2 in the heated state.
- ozone and a mist-like solution 4 come into contact with the heated substrate 2, ozone undergoes thermal decomposition, oxygen radicals are generated, and the oxygen radicals accelerate the decomposition of the solution 4, and the first main surface of the substrate 2.
- a predetermined metal oxide film is formed thereon.
- the film forming step may be a step of supplying a solution 4 and ozone to the substrate 2 disposed at atmospheric pressure to form a metal oxide film on the substrate 2.
- the film forming apparatus 100 is additionally provided with a vacuum pump (not shown) that can depressurize the inside of the reaction vessel 1, and is disposed in a reduced pressure (eg, 0.0001 to 0.1 MPa) environment.
- the step of supplying the solution 4 and ozone to the substrate 2 and forming a metal oxide film on the substrate 2 may be used.
- the solution 4 in which a metal salt, a metal complex, or a metal alkoxide compound is dissolved is used as a metal source. Furthermore, in the reaction container 1 in the atmosphere containing ozone, the mist-like solution 4 is brought into contact with the substrate 2 being heated.
- a metal oxide film can be formed on the substrate 2 even in a low-temperature heating state.
- the substrate heating at about 500 ° C. may be required when forming the metal oxide film, but in this embodiment, as will be described later, even when the substrate is heated at about 200 ° C.
- An oxide film can be formed on the substrate 2.
- Ozone starts decomposing at about 200 ° C. (that is, oxygen radicals start to be generated from ozone at a heating temperature of 200 ° C.). Therefore, even if the heating temperature for the substrate 2 is about 200 ° C., a metal oxide film can be formed on the substrate 2.
- ozone decomposes 90% at 350 ° C. for 3 seconds, and almost 100% decomposes at 500 ° C. for about 0.5 to 0.6 seconds. Therefore, in order to increase the deposition speed of the metal oxide film, the heating temperature of the substrate 2 may be increased.
- ozone is used, but it is not necessary to use acid or alkali for the solution 4.
- the type of metal oxide film to be formed is not limited, and it is possible to form a zinc oxide film that is weak against acids and alkalis.
- FIG. 2 is a view showing an electron microscope observation image of a metal oxide film formed by supplying a mist-like solution 4 onto the substrate 2 without using ozone.
- the metal oxide film in FIG. 2 is when the substrate temperature is 300 ° C.
- zinc acetate dihydrate is adopted as the metal source contained in the solution 4, and a mixed solution of methanol (90 ml) and water (10 ml) is used as the solvent of the solution 4. used.
- concentration of the metal source in the solution 4 is 0.05 mol / L.
- the crystal grains of the formed metal oxide film are small. Due to the small crystal grains, the metal oxide film shown in FIG. 2 has a high sheet resistance value of 4.39 ⁇ 10 5 ⁇ / ⁇ .
- FIG. 3 is a view showing an electron microscope observation image of the metal oxide film formed by the metal oxide film forming method according to the present embodiment.
- the same conditions as the metal oxide film formation conditions shown in FIG. is there).
- the supply concentration of ozone is 50 g / cm 3 .
- the ozone supply flow rate is 2 L / min.
- the crystal grains of the metal oxide film created by the film forming method according to the present embodiment are larger than those in FIG. Due to the large crystal grains, the metal oxide film shown in FIG. 3 has a low sheet resistance value of 4.36 ⁇ 10 3 ⁇ / ⁇ .
- FIG. 4 is an experimental example showing the relationship between the sheet resistance of the metal oxide film and the substrate heating temperature.
- ⁇ indicates an example of experimental data when ozone is not added
- ⁇ indicates an example of experimental data when ozone is added (in the case of the method according to the present embodiment).
- 4 is the substrate heating temperature (° C.)
- the vertical axis in FIG. 4 is the sheet resistance ( ⁇ / ⁇ ) of the metal oxide film.
- the substrate heating temperature is lowered when the metal oxide film forming method according to the present embodiment is employed. It becomes possible.
- the same substrate heating temperature condition is adopted when ozone is added and when ozone is not added, the sheet resistance of the metal oxide film to be formed is better with the film forming method according to this embodiment. Reduced.
- the substrate heating temperature which is a part of the film forming conditions, is lowered and the film is formed.
- the resistance of the metal oxide film can be reduced.
- each crystal grain has a texture structure.
- the crystal grains are rounded and do not have a texture structure.
- the film forming conditions in FIG. 5 are the same as the film forming conditions in FIG. 2 except for the substrate heating temperature.
- the sheet resistance of the metal oxide film created when the substrate heating temperature is high without ozone is created when the substrate heating temperature is low.
- the sheet resistance of the metal oxide film is improved.
- FIG. 5 it should be noted that in the absence of ozone, the crystal grains do not have a texture structure even if the substrate heating temperature is increased.
- the metal oxide film prepared by adding ozone As described above, in the metal oxide film prepared by adding ozone, the crystal grains have a textured structure. Therefore, the metal oxide film prepared by adding ozone is better than the metal oxide film prepared without ozone. However, the light confinement effect is increased. Thus, since the light confinement effect is improved, the photoelectric conversion efficiency of the solar cell can be improved by using the metal oxide film created by adding ozone for the solar cell or the like.
- the haze ratios of the metal oxide films formed were compared at the substrate heating temperature of 300 ° C. with and without ozone addition.
- conditions other than the above are the same in both cases of ozone addition.
- the haze ratio (%) is expressed by (diffuse transmitted light amount / total transmitted light amount) ⁇ 100. The higher the haze ratio, the higher the light confinement effect.
- the size of the crystal grains is reduced even when the substrate heating temperature is as low as about 250 ° C., but the metal oxide film having textured crystal grains is used. It was confirmed that it was formed on the substrate 2. Note that it is theoretically possible to form a metal oxide film having textured crystal grains on the substrate 2 even when the substrate heating temperature is 250 ° C. or lower.
- a transparent conductive film can be formed on the substrate 2.
- the solution 4 contains titanium, zinc, indium and tin
- the solution 4 contains boron, nitrogen, fluorine, magnesium, aluminum, phosphorus, chlorine, gallium, arsenic, niobium, indium as dopants. Any one of antimony and antimony may be included.
- the metal oxide film which is an N-type semiconductor, can be made more electron rich. In this case, the electric resistance of the metal oxide film (transparent electric film) to be formed can be further reduced. Further, the metal oxide film can be a P-type semiconductor depending on the type of the dopant. In the metal oxide film of the P-type semiconductor, holes can serve as carriers to have conductivity, and the utility value as a light emitting device rather than as a transparent conductive film is increased.
- a metal oxide film may be formed on the substrate 2 under atmospheric pressure in the reaction vessel 1.
- a vacuum pump or the like that can depressurize the reaction vessel 1 may be provided. Then, a metal oxide film may be formed on the substrate 2 under the reduced pressure environment while reducing the pressure in the reaction vessel 1 in the range of 0.0001 to 0.1 MPa.
- the solution 4 and ozone are supplied to the substrate 2 through different paths.
- the solution 4 is supplied toward the substrate 2 in the reaction vessel 1 through the path L1.
- ozone is supplied toward the substrate 2 in the reaction vessel 1 through the path L2.
- the place where the ozone and the solution 4 are mixed is limited only to the reaction vessel 1 (arrangement region of the substrate 2). be able to. That is, it is possible to prevent the solution 4 and ozone from being mixed in the supply process path. Therefore, the reaction between the solution 4 and ozone can be performed only in the arrangement region of the substrate 2, and the reaction efficiency in the substrate 2 can be improved. Further, when the solution 4 and ozone are mixed in the supply process, the solution 4 and ozone may react before reaching the substrate to generate an unintended reactant in the gas phase.
- the generation of the unintended reactant causes the film growth on the substrate surface to be hindered (degradation of the film quality due to unintentional deposition of the reactant, reduction of the deposition rate). Therefore, by supplying the solution 4 and ozone to the substrate 2 through different paths L1 and L2, the generation of such unintended reactants can be suppressed.
- the film forming apparatus 100 may further include a control unit (not shown) that performs the following control.
- the said control part performs control which supplies the mist-ized solution 4 and ozone to the board
- the ozone reactivity (oxidation power) in the reaction vessel 1 can be fully utilized.
- the ozone reactivity (oxidation power) in the reaction vessel 1 cannot be fully utilized by supplying the mist solution 4 and ozone separately to the substrate 2 in the reaction vessel 1.
- the characteristics of the metal oxide film to be formed are improved (for example, improvement of crystallinity, improvement of electric resistance depending on mobility and carrier concentration, etc.) ).
- FIG. 6 is a diagram showing a schematic configuration of the metal oxide film forming apparatus according to the present embodiment.
- the metal oxide film deposition apparatus 200 according to the second embodiment is different from the metal oxide film deposition apparatus 100 according to the first embodiment in that the solution container 9 and the mist generator 10 are separately provided. Have been added.
- the solution container 9 is filled with a different type of solution 8 from the solution 4 filled in the solution container 5.
- the mist generator 10 is arrange
- the mist-like solution 8 is sprayed onto the substrate 2 in the reaction vessel 1 via the path L1 and another path L4 different from the path L2.
- the film forming apparatus 200 has the same configuration as the film forming apparatus 100, and the same reference numerals are given to the same configuration. For the description of the same configuration and the operation of the configuration, see Embodiment 1.
- the film forming apparatus 200 mists the solution 4 and mists a different type of solution 8 from the solution 4. Further, the film forming apparatus 200 includes a control unit (not shown), and the solution 4 and the solution 8 are supplied to the substrate 2 in the following manner according to the control of the control unit.
- the different solutions 4 and 8 that have been misted may be simultaneously supplied to the substrate 2 in accordance with the control of the control unit. Moreover, according to control of the said control part, you may supply the different solutions 4 and 8 made into mist to the board
- various metal oxide films having a single layer or a multilayer structure can be formed on the substrate 2.
- a solvent suitable for each material For example, zinc acetate as a metal source is easily soluble in water and alcohol, but aluminum acetylacetonate as a dopant source has low solubility in water and alcohol. For this reason, the concentration may not be set as expected with the same solvent as zinc acetate.
- a solvent for example, acetylacetone
- aluminum acetylacetonate in which aluminum acetylacetonate is easily dissolved can be used separately.
- the number of solution containers is three or more, and different solutions are stored in each solution container, and each solution is mistified by each mist generator disposed in each solution container. May be.
- mist solutions may be simultaneously supplied to the substrate 2 in accordance with control of a control unit (not shown). Further, different mist solutions may be separately supplied to the substrate 2 in a predetermined order according to the control of the control unit. Even in the case of three or more solution containers, it is desirable that each solution is supplied from the solution container toward the substrate 2 in the reaction container 1 through different paths.
- two or more types of solutions and ozone are supplied toward the substrate 2 arranged in the reaction vessel 1.
- ozone is constantly supplied according to control of a control unit (not shown), but different solutions may be supplied separately in a predetermined order. Alternatively, different solutions may be separately supplied in a predetermined order according to control of a control unit (not shown), and the supply of the solution may be temporarily stopped and ozone may be supplied each time the supply of the solution is switched (for example, First solution supply ⁇ Ozone supply ⁇ Second solution supply ⁇ Ozone supply ⁇ Third solution supply ⁇ Ozone supply).
- each solution and ozone are desirably supplied from the solution container or the ozone generator 7 toward the substrate 2 in the reaction container 1 through different paths.
- the reaction container 1 in which the substrate 2 is disposed is in a reduced pressure environment even at atmospheric pressure, as described in the first embodiment. May be.
- FIG. 7 is a diagram showing a schematic configuration of the metal oxide film forming apparatus according to the present embodiment.
- the metal oxide film deposition apparatus 300 according to the third embodiment is different from the metal oxide film deposition apparatus 100 according to the first embodiment in that an ultraviolet light generator 11 and an ultraviolet light transmission window 12 are used. Is added separately.
- the ultraviolet light generator 11 is a part that generates ultraviolet light (wavelength: about 10 nm to 400 nm).
- Examples of the ultraviolet light generator 11 that generates ultraviolet light include a mercury lamp and an excimer lamp. From the low-pressure mercury lamp, ultraviolet light having wavelengths of 254 nm and 185 nm is generated. On the other hand, when xenon, krypton, and argon are used as the cold medium, ultraviolet light of 172 nm, 146 nm, and 126 nm is generated from the excimer lamp, respectively.
- This type of ultraviolet light generator 11 includes a discharge tube, electrodes arranged around the discharge tube, and a power source that applies an AC voltage or a pulse voltage to the electrodes via a power supply line. An AC voltage or a pulse voltage is applied to the electrode by a power source. Thereby, discharge can be caused inside the discharge tube, and ultraviolet light is generated as a result of the discharge.
- the ultraviolet light generator 11 is disposed above the reaction vessel 1, that is, facing the first main surface that is the film formation surface of the metal oxide film of the substrate 2.
- an ultraviolet light transmission window 12 that transmits the ultraviolet light output from the ultraviolet light generator 11 is provided in the upper part of the reaction vessel 1. Specifically, the ultraviolet light transmission window 12 is disposed in a part of the reaction vessel 1 between the ultraviolet light generator 11 and the substrate 2.
- the ultraviolet light transmission window 12 is made of a material that transmits ultraviolet light.
- the ultraviolet light transmission window 12 is made of a material such as magnesium fluoride, calcium fluoride, barium fluoride, lithium fluoride, sodium fluoride, potassium fluoride, quartz, and sapphire.
- the film forming apparatus 300 has the same configuration as the film forming apparatus 100, and the same configuration is denoted by the same reference numeral. For the description of the same configuration and the operation of the configuration, see Embodiment 1.
- the solution 4 mistified by the mist generator 6 is supplied to the first main surface (metal oxide film forming surface) of the substrate 2 disposed in the reaction vessel 1 through the path L1.
- ozone generated by the ozone generator 7 is supplied to the first main surface of the substrate 2 disposed in the reaction vessel 1 through the path L2.
- the substrate 2 When the solution 4 and ozone are supplied, the substrate 2 is heated by the heater 3 in the reaction vessel 1, and the ultraviolet light generated by the ultraviolet light generator 11 is transmitted through the ultraviolet light transmission window. The inside of the reaction container 1 above the substrate 2 is irradiated through 12.
- the ultraviolet light is irradiated to the ozone supplied into the reaction container 1 by the irradiation of the ultraviolet light. Thereby, oxygen radicals are generated from ozone in the reaction vessel 1.
- ultraviolet light having a wavelength of 300 nm or less in order to decompose ozone into oxygen radicals, it is desirable to irradiate ultraviolet light having a wavelength of 300 nm or less (particularly, a wavelength of about 254 nm).
- the metal oxide film deposition apparatus 300 includes the ultraviolet light generator 11 and the ultraviolet light transmission window 12 that transmits ultraviolet light.
- the reaction vessel 1 to which ozone and the solution 4 are supplied is irradiated with ultraviolet light.
- ozone is decomposed into oxygen radicals by the ultraviolet light irradiation, and the reaction for forming the metal oxide film in the reaction vessel 1 (more specifically, on the first main surface of the substrate 2) is promoted. Can do.
- the heater 3 for heating the substrate 2 can be omitted in the film forming apparatus 300 shown in FIG. This is because a metal oxide film is generated even on the substrate 2 at room temperature (room temperature) by introducing the ultraviolet light irradiation configuration.
- disposing the heater 3 in the film forming apparatus 300 has the following advantages. That is, the heater 3 is provided as shown in FIG. 7, the substrate 2 is heated to about 100 ° C., ozone is supplied, and the ozone is irradiated with ultraviolet light. Thereby, compared with the structure which does not provide the heater 3, the reaction of metal oxide film formation in the board
- substrate 2 can be promoted more.
- the ultraviolet light irradiation structure to the reaction container 1 since the ultraviolet light irradiation structure to the reaction container 1 is provided, it is not ozone but the oxygen supplied to the said reaction container 1 may be sufficient. That is, it is not necessary to generate ozone by the ozone generator 7, oxygen is supplied onto the first main surface of the substrate 2 in the reaction vessel 1 via the path L ⁇ b> 2, and oxygen supplied into the reaction vessel 1 is supplied. May be irradiated with ultraviolet light.
- a mist-like solution 4 is also supplied onto the first main surface of the substrate 2 in the reaction vessel 1 through the path L1.
- oxygen radicals are generated from oxygen.
- the misted solution 4 and ozone (or oxygen) are supplied into the reaction vessel 1 simultaneously or separately based on control of a control unit (not shown). Also in the present embodiment, it is desirable to supply the misted solution 4 and ozone (or oxygen) into the reaction vessel 1 through different paths L1 and L2. Further, the supply of the mist solution 4 and ozone (or oxygen) may be performed with respect to the substrate 2 disposed at atmospheric pressure, and in a reduced pressure (for example, 0.0001 to 0.1 MPa) environment. You may carry out with respect to the board
- the configuration in which the ultraviolet light generator 11 and the ultraviolet light transmission window 12 are separately added to the metal oxide film forming apparatus 100 according to the first embodiment has been mentioned.
- a configuration in which the ultraviolet light generator 11 and the ultraviolet light transmission window 12 are separately added to the film forming apparatus described in the second embodiment capable of supplying two or more types of solutions may be employed (FIG. 8). reference).
- the different solutions 4 and 8 that are misted may be simultaneously supplied to the substrate 2 under the control of a control unit (not shown). Further, under the control of a control unit (not shown), the different mist solutions 4 and 8 may be separately supplied to the substrate 2 in a predetermined order. Even in these supply modes, as described in the second embodiment, the solutions 4 and 8 are supplied from the solution containers 5 and 9 toward the substrate 2 in the reaction container 1 through different paths L1 and L4. It is desirable that
- ozone (or oxygen) is always supplied under the control of a control unit (not shown), but a different mist solution 4 and 8 may be supplied separately in a predetermined order.
- a control unit not shown
- different mist solutions 4 and 8 are separately supplied in a predetermined order, and the supply of the solutions 4 and 8 is temporarily stopped each time the supply of the solutions 4 and 8 is switched.
- You may stop and supply ozone (or oxygen) for example, supply of solution 4-> supply of ozone (or oxygen)-> supply of solution 8-> supply of ozone (or oxygen)).
- the solutions 4 and 8 and ozone (or oxygen) are supplied toward the substrate 2 in the reaction vessel 1 through different paths L1, L2, and L4. It is desirable.
- FIG. 9 is a diagram showing a schematic configuration of a metal oxide film forming apparatus according to the present embodiment.
- the plasma generator 13 is added to the metal oxide film forming apparatus 100 according to the first embodiment.
- the plasma generator 13 is provided in the middle of the path L2 disposed between the ozone generator 7 and the reaction vessel 1. Two electrodes are arranged in the plasma generator 13 at a predetermined distance. When ozone is supplied between the electrodes to which a high-frequency voltage is applied, the ozone is turned into plasma and oxygen radicals are generated. Oxygen radicals generated in the plasma generator 13 are supplied into the reaction vessel 1 through the path L2.
- the film forming apparatus 400 is the same as the film forming apparatus 100 except for the separately added structure, and the same reference numerals are given to the same structure. For the description of the same configuration and the operation of the configuration, see Embodiment 1.
- the solution 4 mistified by the mist generator 6 is supplied to the first main surface (metal oxide film forming surface) of the substrate 2 disposed in the reaction vessel 1 through the path L1. .
- the ozone generated by the ozone generator 7 is decomposed into oxygen radicals in the plasma generator 13 on the way through the path L2, and the first main body of the substrate 2 disposed in the reaction vessel 1 is used. Supplied to the surface.
- the substrate 2 is heated by the heater 3 in the reaction vessel 1.
- the plasma generator 13 may be any device that converts ozone into plasma and thereby generates oxygen radicals, and the position of the plasma generator 13 is not particularly limited to the configuration shown in FIG. No.
- the plasma generator 13 may be disposed in the reaction container 1 near the reaction container 1 in the path L2.
- the metal oxide film deposition apparatus 400 includes the plasma generator 13. Then, ozone supplied to the reaction vessel 1 is decomposed by the plasma generator 13.
- ozone is decomposed into oxygen radicals by the plasma generator 13, and the reaction for forming the metal oxide film in the reaction vessel 1 (more specifically, on the first main surface of the substrate 2) is promoted. Can do.
- the heater 3 for heating the substrate 2 in the film forming apparatus 400 shown in FIG. Can be omitted. This is because the introduction of the plasma generator 13 generates a metal oxide film even on the substrate 2 at room temperature (room temperature).
- disposing the heater 3 in the film forming apparatus 400 has the following advantages. That is, the heater 3 is provided as in the configuration of FIG. 9, the substrate 2 is heated to about 100 ° C., ozone is supplied, and the ozone is converted into plasma using the plasma generator 13. Thereby, compared with the structure which does not provide the heater 3, the reaction of metal oxide film formation in the board
- substrate 2 can be promoted more.
- the plasma generator 13 for converting ozone into plasma since the plasma generator 13 for converting ozone into plasma is provided, it is possible that oxygen is supplied to the reaction vessel 1 instead of ozone. That is, it is not necessary to generate ozone by the ozone generator 7, and oxygen is supplied toward the first main surface of the substrate 2 in the reaction vessel 1 via the path L2, and the oxygen in the reaction vessel 1 or the path L2 is supplied.
- the oxygen may be converted into plasma during the process.
- Oxygen is converted into plasma in the plasma generator 13 to generate oxygen radicals from oxygen.
- a mist-like solution 4 is also supplied onto the first main surface of the substrate 2 in the reaction vessel 1 through the path L1.
- the misted solution 4 and ozone (or oxygen) are supplied into the reaction vessel 1 simultaneously or separately. Also in the present embodiment, it is desirable to supply the misted solution 4 and ozone (or oxygen) into the reaction vessel 1 through different paths L1 and L2. Further, the supply of the mist solution 4 and ozone (or oxygen) may be performed with respect to the substrate 2 disposed at atmospheric pressure, and in a reduced pressure (for example, 0.0001 to 0.1 MPa) environment. You may carry out with respect to the board
- the configuration in which the plasma generator 13 is separately added to the metal oxide film forming apparatus 100 according to the first embodiment is mentioned.
- a configuration in which the plasma generator 13 is separately added to the film formation apparatus described in Embodiment 2 that can supply two or more types of solutions may be employed (see FIG. 10).
- different mist solutions 4 and 8 may be simultaneously supplied to the substrate 2. Further, the different mist solutions 4 and 8 may be separately supplied to the substrate 2 in a predetermined order. Even in these supply modes, as described in the second embodiment, the solutions 4 and 8 are directed from the solution containers 5 and 9 toward the substrate 2 in the reaction container 1 through different paths L1 and L4. It is desirable to be supplied.
- ozone or oxygen
- different mist-like solutions 4 and 8 are separately supplied in a predetermined order. You may supply with. Alternatively, different misted solutions 4 and 8 are separately supplied in a predetermined order, and whenever the supply of the solutions 4 and 8 is switched, the supply of the solutions 4 and 8 is temporarily stopped, and ozone (or oxygen) is supplied. You may supply (for example, supply of the solution 4-> supply of ozone (or oxygen)-> supply of the solution 8-> supply of ozone (or oxygen)).
- the solutions 4 and 8 and ozone (or oxygen) are supplied toward the substrate 2 in the reaction vessel 1 through different paths L1, L2, and L4. It is desirable.
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Abstract
Description
図1は、本実施の形態に係る金属酸化膜の成膜装置の概略構成を示す図である。
図6は、本実施の形態に係る金属酸化膜の成膜装置の概略構成を示す図である。
図7は、本実施の形態に係る金属酸化膜の成膜装置の概略構成を示す図である。
図9は、本実施の形態に係る金属酸化膜の成膜装置の概略構成を示す図である。
Claims (16)
- (A)金属を含む溶液(4,8)をミスト化させる工程と、
(B)基板(2)を加熱する工程と、
(C)前記工程(B)中の前記基板の第一の主面上に、前記工程(A)においてミスト化された前記溶液と、オゾンとを供給する工程とを、備えている、
ことを特徴とする金属酸化膜の成膜方法。 - (V)金属を含む溶液(4,8)をミスト化させる工程と、
(W)基板(2)の第一の主面上に、前記工程(V)においてミスト化された前記溶液と、酸素またはオゾンとを供給する工程と、
(X)前記酸素または前記オゾンに紫外光を照射する工程とを、備えている、
ことを特徴とする金属酸化膜の成膜方法。 - (V)金属を含む溶液(4,8)をミスト化させる工程と、
(W)基板(2)の第一の主面上に、前記工程(V)においてミスト化された前記溶液と、酸素またはオゾンとを供給する工程と、
(W)前記酸素または前記オゾンをプラズマ化する工程とを、備えている、
ことを特徴とする金属酸化膜の成膜方法。 - 前記工程(W)は、
加熱されている前記基板に、前記酸素または前記オゾンを供給する工程である、
ことを特徴とする請求項2または請求項3に記載の金属酸化膜の成膜方法。 - 前記金属は、
チタン、亜鉛、インジウムおよびスズの内の少なくとも何れか1つである、
ことを特徴とする請求項1乃至請求項3のいずれかに記載の金属酸化膜の成膜方法。 - 前記溶液には、
ホウ素、窒素、フッ素、マグネシウム、アルミニウム、燐、塩素、ガリウム、砒素、ニオブ、インジウムおよびアンチモンの何れか1つが、少なくとも含まれている、
ことを特徴とする請求項5に記載の金属酸化膜の成膜方法。 - 前記工程(A)または(V)は、
2種類以上の前記溶液を、各々ミスト化させる工程であり、
前記工程(C)または(W)は、
異なる前記溶液を、同時にまたは別々に、供給する工程である、
ことを特徴とする請求項1乃至請求項3のいずれかに記載の金属酸化膜の成膜方法。 - 前記工程(C)は、
前記溶液と前記オゾンとを、同時にまたは別々に、供給する工程である、
ことを特徴とする請求項1に記載の金属酸化膜の成膜方法。 - 前記工程(W)は、
前記溶液と前記酸素または前記オゾンとを、同時にまたは別々に、供給する工程である、
ことを特徴とする請求項2または請求項3に記載の金属酸化膜の成膜方法。 - 前記工程(C)は、
前記溶液と前記オゾンとを、異なる経路(L1,L2,L4)を通して供給する工程である、
ことを特徴とする請求項1に記載の金属酸化膜の成膜方法。 - 前記工程(W)は、
前記溶液と前記酸素または前記オゾンとを、異なる経路(L1,L2,L4)を通して供給する工程である、
ことを特徴とする請求項2または請求項3に記載の金属酸化膜の成膜方法。 - 前記工程(C)は、
大気圧に配設されている前記基板に、前記溶液と前記オゾンとを供給する工程である、
ことを特徴とする請求項1に記載の金属酸化膜の成膜方法。 - 前記工程(W)は、
大気圧に配設されている前記基板に、前記溶液と前記酸素または前記オゾンとを供給する工程である、
ことを特徴とする請求項2または請求項3に記載の金属酸化膜の成膜方法。 - 前記工程(C)は、
減圧環境下に配設されている前記基板に、前記溶液と前記オゾンとを供給する工程である、
ことを特徴とする請求項1に記載の金属酸化膜の成膜方法。 - 前記工程(W)は、
減圧環境下に配設されている前記基板に、前記溶液と前記酸素または前記オゾンとを供給する工程である、
ことを特徴とする請求項2または請求項3に記載の金属酸化膜の成膜方法。 - 請求項1乃至請求項15のいずれかに記載の金属酸化膜の成膜方法を実施する、
ことを特徴とする金属酸化膜の成膜装置。
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US13/059,128 US20110151619A1 (en) | 2008-09-24 | 2008-09-24 | Method of forming metal oxide film and apparatus for forming metal oxide film |
DE112008004012T DE112008004012T5 (de) | 2008-09-24 | 2008-09-24 | Verfahren zur Erzeugung eines Metalloxidfilmes und Anlage zur Erzeugung eines Metalloxidfilmes |
JP2010530644A JP5271355B2 (ja) | 2008-09-24 | 2008-09-24 | 金属酸化膜の成膜方法および金属酸化膜の成膜装置 |
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JP5271355B2 (ja) | 2013-08-21 |
KR20110056522A (ko) | 2011-05-30 |
US20110151619A1 (en) | 2011-06-23 |
DE112008004012T5 (de) | 2011-09-29 |
CN102165096A (zh) | 2011-08-24 |
JPWO2010035313A1 (ja) | 2012-02-16 |
KR101333437B1 (ko) | 2013-11-26 |
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