WO2017115783A1 - 積層体及びその製造方法、ガスバリアフィルム及びその製造方法、並びに有機発光素子 - Google Patents
積層体及びその製造方法、ガスバリアフィルム及びその製造方法、並びに有機発光素子 Download PDFInfo
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- WO2017115783A1 WO2017115783A1 PCT/JP2016/088851 JP2016088851W WO2017115783A1 WO 2017115783 A1 WO2017115783 A1 WO 2017115783A1 JP 2016088851 W JP2016088851 W JP 2016088851W WO 2017115783 A1 WO2017115783 A1 WO 2017115783A1
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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
- C23C16/455—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
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
- C23C16/45536—Use of plasma, radiation or electromagnetic fields
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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
- C23C16/455—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
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45555—Atomic layer deposition [ALD] applied in non-semiconductor technology
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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
- C23C16/56—After-treatment
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
- H05B33/04—Sealing arrangements, e.g. against humidity
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/351—Thickness
Definitions
- the present invention relates to a laminate and a manufacturing method thereof, and a gas barrier film and a manufacturing method thereof.
- the present invention relates to a laminate including a substrate formed of a polymer material and a method for producing the same, and a gas barrier film including the laminate and a method for producing the same.
- the present invention also relates to an organic light emitting device including a gas barrier film, a first electrode layer, a light emitting layer, and a second electrode layer.
- the present invention also relates to a laminate including an atomic layer deposition film and a method for manufacturing the same.
- the gas barrier function has been required for the purpose of packaging a target object in the field of food, medicine, and the like.
- a gas barrier film provided with a gas barrier function by forming a thin film on the film substrate it becomes possible to prevent alteration such as oxidation of the object due to moisture resistance and oxygen barrier properties.
- gas barrier functions such as moisture proofing and oxygen barrier are also required in fields related to electronic devices such as organic light emitting (EL) elements, liquid crystal display elements, and solar cells. Since these electronic devices are required to have a high gas barrier function, glass substrates are conventionally used. However, as electronic devices become thinner, lighter, and flexible, a film having a gas barrier function equivalent to that of a glass substrate has attracted attention as an alternative to a glass substrate.
- EL organic light emitting
- CVD chemical vapor deposition
- PVD Physical Vapor Deposition
- PVD physical vapor deposition
- ALD atomic layer deposition
- Examples of the PVD method include a vacuum deposition method and a sputtering method.
- the sputtering method can form a high-quality thin film with excellent film quality and thickness uniformity, so it can form transparent electrode wiring films and electrode wiring films for display devices such as liquid crystal displays, and light reflecting films for optical disks. Widely applied.
- the CVD method is a method for growing a solid thin film by introducing a raw material gas into a vacuum chamber and decomposing or reacting one or more kinds of gases with thermal energy on a substrate. At this time, in order to promote the reaction at the time of film formation or to lower the reaction temperature, there are those using plasma or a catalyst (Catalyst) reaction in combination.
- a catalyst Catalyst
- the CVD method using a plasma reaction is referred to as a PECVD (Plasma Enhanced CVD) method.
- a CVD method using a catalytic reaction is called a Cat-CVD method.
- film formation defects are reduced, and thus, for example, it is applied to a semiconductor device manufacturing process (for example, a gate insulating film forming process).
- a general CVD method is a method of growing a thin film by reacting on a base slope using a single gas or a plurality of gases simultaneously.
- an active gas called a precursor or a precursor (hereinafter referred to as “first precursor”) and a reactive gas (also referred to as a precursor in the ALD method).
- first precursor an active gas
- second precursor a reactive gas
- the first precursor is referred to as a “second precursor” alternately, and the first precursor is adsorbed on the substrate surface, followed by the first precursor of the second precursor.
- This is a special film formation method in which a thin film is grown layer by layer at the atomic level by the chemical reaction.
- This film formation by the ALD method is generally referred to as two-dimensional growth.
- the first precursor include TMA (Tri-Methyl Aluminum), and examples of the reactive gas include oxygen, carbon dioxide, water vapor (water), and the like.
- a specific film formation method of the ALD method is performed by the following method.
- the self-limiting effect is a phenomenon in which, when the surface is covered with a certain kind of gas, the gas is not further adsorbed on the surface of the substrate.
- a reactive gas is introduced into the chamber, and the precursor is oxidized or reduced to form only one layer of a thin film having a desired composition. Thereafter, the reactive gas is exhausted.
- the first and second steps are set as one cycle, and this cycle is repeated to grow a thin film on the substrate. Therefore, in the ALD method, a thin film grows two-dimensionally.
- the ALD method is characterized in that it has fewer film-forming defects in comparison with the conventional vacuum deposition method, sputtering method, and the like, as well as the general CVD method. For this reason, it is expected to be applied to a wide range of fields such as the packaging field for foods and pharmaceuticals and the electronic parts field.
- the ALD method includes a method of using plasma to activate the reaction in the step of decomposing the second precursor and reacting with the first precursor adsorbed on the base material.
- This method is called plasma activated ALD (PEALD: PlasmaPEnhanced ALD) or simply plasma ALD.
- Patent Literature 1 discloses a gas barrier film having alternately at least one barrier layer formed of an inorganic material and at least one organic layer on a plastic substrate.
- this gas barrier film it is disclosed that at least one of the barrier layers is formed by an ALD method.
- the gas barrier film in which a thin film having a gas barrier function is formed on a film substrate by the above-described CVD method or PVD method other than the ALD method it can be used as a substitute for a glass substrate. High gas barrier properties cannot be realized.
- Patent Document 2 discloses a sealing film having an excellent gas barrier function in which a protective layer made of a polymer material is formed on a gas barrier film in which a thin film having a gas barrier function is formed on a film substrate by using a CVD method or a PVD method.
- a stop film in an electronic device such as an organic EL is disclosed.
- Patent Document 3 describes that a barrier layer is formed by modifying a layer containing polysilazane.
- Patent Document 3 it is possible to provide a high gas barrier function, but the barrier layer is not protected, and the resistance to temperature and humidity related to the long-term reliability of the electronic device is insufficient.
- a gas barrier film has a metal or metal oxide film having a gas barrier function formed on at least one surface of a substrate.
- a gas barrier film as in Patent Document 1 has a metal or metal oxide film having a barrier function formed on at least one surface of a substrate.
- the base material is a polymer film
- the surface has large irregularities and has a nano-level space such as a free volume.
- stable formation of metal or metal oxide becomes difficult.
- products that use a gas barrier film that uses a polymer film as the base material may deteriorate when exposed to environmental stresses such as high heat and high humidity, or the base material and the metal-containing film The adhesion between the two may be reduced. As a result, the laminate may not be able to maintain a desired gas barrier function.
- Patent Document 4 discloses that a first inorganic material is formed on a base material formed from a plastic film and a base layer formed from an ultraviolet curable resin having a smoother surface than the plastic film.
- a technique for forming a material by sputtering is disclosed.
- Patent Document 4 also describes that a barrier layer is further provided by an ALD method on a barrier layer formed by a sputtering method.
- a second gas barrier layer is formed by an atomic layer deposition method on a base material and a first gas barrier layer containing a polysilazane compound formed on the base material under high temperature and high humidity conditions.
- a technique for improving the storage stability of the is disclosed.
- Patent Document 6 discloses an article comprising a substrate made of a material selected from the group consisting of plastic and glass, and a gas permeable barrier deposited on the substrate by atomic layer deposition.
- a light-emitting polymer is mounted on a light-transmitting plastic substrate, and the surface and side surfaces of the light-emitting polymer are subjected to atomic layer deposition by ALD (top coating is performed). It is disclosed that it is possible to reduce defects and to reduce gas permeation by orders of magnitude at a thickness of several tens of nanometers.
- the atomic layer deposition film is grown on the base material made of an inorganic crystal such as an Si wafer. It is different from the case of forming.
- an atomic layer deposition film is formed on the base material by oxidation of the surface of the Si wafer using the ALD method, adsorption sites of precursors as raw materials for the atomic layer deposition film are formed on the surface of the base material. Exists at a high density, the growth of the atomic layer deposition film proceeds in a two-dimensional growth mode.
- an atomic layer deposition film is formed on a base material made of an organic polymer by the ALD method
- adsorption sites of precursors that are raw materials for the atomic layer deposition film are present at a low density on the surface of the base material. Therefore, the atomic layer deposition film grows and expands three-dimensionally with the precursor adsorbed isolated on the surface of the substrate as a nucleus, so that the adjacent nucleus contacts and the atomic layer deposition film becomes a continuous film It has been known. Furthermore, depending on the state of the substrate made of organic polymer and the process conditions of ALD, there is a high possibility that the atomic layer deposition film does not become a continuous film.
- a gas flows from the outer surface of the atomic layer deposition film to the substrate side through a plurality of gaps constituting the atomic layer deposition film.
- the atomic layer deposition film may not have an ideal gas barrier property.
- Patent Document 7 discloses that a base layer made of an inorganic material is formed on a base material made of an organic polymer (the outer surface of the base material), and an atomic layer deposition film is formed on the surface of the base layer. Yes.
- Patent Document 4 since a polymer material is used for the underlayer and the barrier film is formed by a sputtering method, a high gas barrier function cannot be obtained. Furthermore, in the configuration in which the barrier layer formed by the ALD method described in Patent Document 4 is provided on the outermost surface, atomic layer deposition that exhibits a gas barrier function by direct exposure to a high temperature and high humidity environment or mechanical stress. The film is deteriorated and damaged, and it is difficult to ensure reliability.
- the technique disclosed in Patent Document 5 employs a method in which an inorganic polymer is formed as an underlayer by subjecting a polysilazane compound to vacuum ultraviolet light irradiation or hydrolysis reaction, and an atomic layer deposition film is formed on the underlayer.
- the gas barrier function is slowly manifested and it is difficult to ensure reliability.
- the atomic layer deposition film is arranged in the outermost layer, the atomic layer deposition film that exhibits the gas barrier function is deteriorated and damaged by direct exposure to high temperature and high humidity environment and mechanical stress. It becomes difficult to ensure.
- the surface on which the functional layer is formed is not a surface having a free volume space like a polymer film, and there is no free volume.
- a laminate having a functional layer on the outer surface of a substrate made of an organic polymer by physical vapor deposition or chemical vapor deposition has been widely known, and the laminate has gas barrier properties. It is preferably used for a flexible film exhibiting a function such as a gas barrier film having a slag.
- the atomic layer deposition film is formed by the presence of a free volume space. Dimensional growth is delayed and gas barrier function is also delayed. Furthermore, since a dense film is not formed, chemical stability is also impaired, and it becomes difficult to sufficiently secure the reliability of the functional layer, and there is a possibility that the characteristics of the functional layer cannot be maintained.
- the functional layer is deteriorated and the characteristics of the functional layer are deteriorated, so that it is difficult to ensure the gas barrier function of the laminate. Therefore, when forming an organic light-emitting element directly on the functional layer, the functional layer deteriorates due to stress in the element formation process, and the organic light-emitting element has a protective function from gases such as water vapor and oxygen. There is a possibility that a portion (dark spot) where the organic light emitting device cannot display (emit light) is generated.
- the present inventors examined the relationship between the gas barrier properties and the underlayer, as a factor that the sufficient gas barrier properties were not obtained, the underlayer made of an inorganic material has pores, Because of the large pore diameter, the precursor that should be bonded to the functional groups (adsorption sites) on the surface of the underlayer diffuses into the underlayer and is sufficient to fill the vacancies. I guessed that it was because the two-dimensional growth did not start. In particular, when the atomic layer deposition film is thin, there is a problem that sufficient gas barrier properties cannot be secured.
- the present invention has been made in view of the above problems, and is a laminate having a base material formed of a polymer material and a functional layer having an atomic layer deposition film formed on the base material. It aims at providing the laminated body which can improve reliability, and its manufacturing method.
- An object of this invention is to provide the gas barrier film which can improve reliability and gas barrier property, and its manufacturing method.
- the present invention provides an organic light emitting device with a gas barrier film that suppresses functional degradation and damage of the functional layer and improves the gas barrier function and long-term reliability of the functional layer made of an atomic layer deposition film. Objective.
- the present invention has been made in view of the above problems, and is an inorganic material having a small maximum pore diameter that is arranged on a base material made of an organic polymer and can enhance the gas barrier property of an atomic layer deposition film. It aims at providing the laminated body which has the base layer which consists of material, and its manufacturing method.
- the laminate according to the first aspect of the present invention has a first surface, a base material formed from a polymer material, and an atomic layer deposition film disposed on at least a part of the base material on the first surface.
- the undercoat layer and the overcoat layer are inorganic layers containing at least one element among Group III elements, Group IV elements, Group V elements, and lanthanoid elements. Also good.
- the undercoat layer and the overcoat layer may include at least one of an oxide, a nitride, and an oxynitride.
- the undercoat layer and the overcoat layer may contain a tantalum (Ta) element.
- the thickness of the undercoat layer may be 1 nm or more and 200 nm or less.
- the thickness of the functional layer may be not less than 0.5 nm and not more than 200 nm.
- the overcoat layer may have a thickness of 5 nm to 200 nm.
- the adsorption site located on the outer surface of the undercoat layer may have an oxygen (O) atom or a nitrogen (N) atom.
- the gas barrier film which concerns on the 2nd aspect of this invention contains the laminated body which concerns on the said 1st aspect, and the water vapor transmission rate of the said laminated body is 0.5 g / (m ⁇ 2 > * day) or less.
- the organic light-emitting device includes the laminate according to the first aspect, the first electrode layer, the light-emitting layer, and the second electrode layer.
- the water vapor permeability of the laminate may be 0.01 g / (m 2 ⁇ day) or less.
- a base material formed of a polymer material is disposed in a vacuum chamber, and an atomic layer deposition film is formed on at least a part of the outer surface of the base material.
- An undercoat layer containing a first inorganic substance having an adsorption site capable of binding to a precursor as a raw material was formed, and bonded to the adsorption site by an atomic layer deposition method so as to cover the outer surface of the undercoat layer Forming a functional layer containing a second inorganic substance from the precursor, and forming an overcoat layer containing a third inorganic substance so as to cover an outer surface of the functional layer.
- the cycle of the fourth step from the first may be performed more than 15 times.
- the undercoat layer and the overcoat layer may be formed by a chemical vapor deposition method or a physical vapor deposition method.
- the undercoat layer and the overcoat layer are at least one element selected from Group III elements, Group IV elements, Group V elements, and lanthanoid elements. It may be formed as an inorganic layer containing.
- the undercoat layer may be formed to a thickness of 1 nm to 20 nm.
- the functional layer may be formed to a thickness of 1 nm to 200 nm.
- the overcoat layer may be formed to be 5 nm or more and 200 nm or less.
- the method for producing a gas barrier film according to the fifth aspect of the present invention is formed by the method for producing a laminate according to the fifth aspect so that the water vapor transmission rate is 0.5 g / (m 2 ⁇ day) or less.
- the laminate is formed.
- an inorganic material is used on at least a part of the outer surface of a base material formed from an organic polymer disposed in a vacuum chamber, and the maximum pore diameter is A base layer having a thickness of 1.0 nm or less is formed, a precursor as a film forming raw material is supplied to the outer surface of the base layer, and the precursor and a reactive gas are reacted at least at a part of the outer surface of the base layer.
- a precursor as a film forming raw material is supplied to the outer surface of the base layer, and the precursor and a reactive gas are reacted at least at a part of the outer surface of the base layer.
- the undercoat layer is formed on the base material formed from the polymer material. Therefore, an atomic layer deposition film is densely formed on the undercoat layer. Furthermore, the functional layer formed from the atomic layer deposition film is covered with an overcoat layer. Therefore, there is an effect that it is possible to improve the reliability of a laminate including a base material formed of a polymer material and a functional layer having an atomic layer deposition film formed on the base material. According to the gas barrier film and the method for producing the same according to each aspect of the present invention, the laminate of the present invention and the method for producing the same are used. Therefore, there is an effect that the reliability and gas barrier properties of the gas barrier film can be improved.
- FIG. 2A It is sectional drawing which shows typically the structural example of the laminated body which concerns on 1st Embodiment of this invention. It is a typical sectional view of a substrate used for a layered product concerning a 1st embodiment of the present invention, and a gas barrier film concerning a 2nd embodiment. It is an enlarged view of the A section of FIG. 2A. It is sectional drawing which shows typically the mode of the 1st layer of an atomic deposition film in the case of forming a functional layer without interposing an undercoat layer on a board
- FIG. 1 is a cross-sectional view schematically showing a configuration example of a laminated body according to the first embodiment of the present invention. Since FIG. 1 is a schematic diagram, the size, thickness, dimensions, and the like of each part illustrated do not accurately represent the dimensional relationship of the actual laminate (the same applies to the following drawings).
- the laminate (gas barrier film) 10 of this embodiment includes a base material 11, an undercoat layer 12 (inorganic layer), a functional layer 13, an overcoat layer 14 (inorganic layer),
- a base material 11 an undercoat layer 12 (inorganic layer)
- a functional layer 13 an overcoat layer 14 (inorganic layer)
- an overcoat layer 14 inorganic layer
- the base material 11 is formed from a polymer material.
- the base material 11 has an outer surface 11a (first surface) on which an undercoat layer 12 described later is formed as one surface in the thickness direction.
- the type of the polymer material constituting the substrate 11 is not particularly limited.
- the substrate 11 may be a plate having no flexibility or a film having flexibility.
- a film-like substrate hereinafter referred to as a film-like substrate
- the thickness of the substrate 11 (film-like substrate) is, for example, preferably in the range of 12 ⁇ m to 300 ⁇ m, and more preferably in the range of 12 ⁇ m to 100 ⁇ m.
- the thickness of the base material 11 When the thickness of the base material 11 is less than 12 ⁇ m, the handling property is lowered, and folding, wrinkles and the like are likely to occur. On the other hand, when the thickness of the base material 11 exceeds 300 ⁇ m, the material constituting the base material 11 increases, so the cost increases.
- polymer material used as the material of the substrate 11 examples include, for example, polyethylene terephthalate (PET), polyethersulfone (PES), polyimide (PI), and the like.
- the undercoat layer 12 is an inorganic layer formed on the outer surface 11a of the substrate 11 in order to laminate a functional layer 13 described later.
- the inorganic substance in the undercoat layer 12 includes a first inorganic substance.
- the first inorganic substance has an adsorption site that easily binds to a precursor that is a film forming raw material used when forming an atomic layer deposition film 24 constituting the functional layer 13 described later.
- the adsorption site of the first inorganic substance includes an atom having an unshared electron pair or an unpaired electron, such as a coordination bond with a precursor described later, a bond by intermolecular force (van der Waals force), a hydrogen bond, etc. It only needs to have a chemical structure that interacts.
- the undercoat layer 12 includes a first inorganic substance, so that an adsorption site where a precursor, which is a film forming raw material for the atomic layer deposition film, can be chemically adsorbed, is opposite to the outer surface 11a of the substrate 11 in the thickness direction. On the outer surface 12a which is the surface.
- the first inorganic material used for the undercoat layer 12 is not particularly limited as long as a precursor, which is a raw material for forming an atomic layer deposition film 24 described later, has atoms or functional groups that can be chemically adsorbed on the surface.
- atoms or functional groups that can be chemically adsorbed by the precursor include oxygen (O) atoms, nitrogen (N) atoms, and other atoms and functional groups that exhibit nucleophilic properties.
- the first inorganic substance included in the undercoat layer 12 may contain, for example, at least one element among Group III elements, Group IV elements, Group V elements, and lanthanoid elements.
- the first inorganic substance a metal oxide, a metal nitride, a metal sulfide, or a metal oxynitride may be used. Further, the first inorganic substance may be a mixed film or a ternary or higher compound containing a plurality of metal elements. The first inorganic substance may contain a Group II element and a transition metal element. Furthermore, the first inorganic substance may have an adsorption site on the surface where a precursor, which is a raw material for forming an atomic layer deposition film such as an OH group, can be chemically adsorbed. Further, the main component of the undercoat layer 12 may be a metal film.
- the metal oxides which can be used as the first inorganic material can be cited TaO x or, SiO x, TiO x, HfO x, NbO x, ZrO x, etc. AlO x.
- examples of the metal nitride include SiN y , TiN y , and AlN y .
- examples of the ternary oxide include AlSi x O y .
- a gate insulating film used in a semiconductor device such as BaTiO 3 or SrTiO 3
- a composition used as a material for a memory element, or a material that generally has a small leakage current is used.
- a composition may be used.
- the undercoat layer 12 can be formed on the substrate 11 by using, for example, a chemical vapor deposition method (CVD method) or a physical vapor deposition method (PVD method).
- the undercoat layer 12 may be formed by a sol-gel method. Since the undercoat layer 12 is formed by using a CVD method, a PVD method, or a sol-gel method, even if it has a free volume space on the surface like the base material 11 formed of a polymer material, it is dense. In addition, a smooth layered portion can be formed.
- the thickness of the undercoat layer 12 may be, for example, 1 nm or more and 1000 nm or less. When the thickness of the undercoat layer 12 is less than 1 nm, the undercoat layer 12 tends to stay at the island-like growth stage and may not grow as a film. When the undercoat layer 12 remains in the island-like growth stage, it becomes impossible to form a base on which an atomic layer deposition film described later can grow two-dimensionally at an early stage. When the thickness of the undercoat layer 12 exceeds 1000 nm, it takes too much time for film formation, and the cost increases. When the undercoat layer 12 is subjected to stress such as bending or expansion due to heat from the base material 11, defects such as cracks may easily occur.
- the thickness of the undercoat layer 12 is more preferably 1 nm or more and 200 nm or less.
- the below-mentioned free volume in the outer surface 11a of the base material 11 can be more reliably covered as the thickness of the undercoat layer 12 is 1 nm or more. Therefore, it becomes easy to form a base on which the atomic layer deposition film can grow two-dimensionally, and the gas barrier function of the atomic layer deposition film described later becomes better. Furthermore, the strength and gas barrier properties of the undercoat layer 12 itself are further increased. Therefore, the gas barrier function as the laminated body 10 can be improved. When the thickness of the undercoat layer 12 is 200 nm or less, the time and cost required to form the undercoat layer 12 can be reduced.
- the thickness of the undercoat layer 12 is formed to 3 nm or more and 200 nm or less, as will be described later, while securing a base for early two-dimensional growth of the atomic layer deposition film, it is possible in a short time and at low cost.
- the undercoat layer 12 can be formed.
- FIG. 1 shows an example in which the undercoat layer 12 is disposed so as to cover the entire outer surface 11a of the substrate 11 as an example.
- the undercoat layer 12 should just be arrange
- the functional layer 13 is disposed so as to cover the outer surface 12 a of the undercoat layer 12.
- the functional layer 13 has an outer surface 13a that is a surface opposite to the outer surface 12a of the undercoat layer 12.
- an adsorption site located on the outer surface 12a of the undercoat layer 12 and a precursor that is a film forming raw material are bonded. That is, the functional layer 13 is an atomic layer deposition film 24 formed by an atomic layer deposition method (ALD method).
- an organometallic compound is used as a precursor that is a raw material for forming the atomic layer deposition film 24.
- organometallic compound used for the precursor include trimethylaluminum (TMA (Tri-Methyl Aluminum)), titanium tetrachloride (TiCl 4 ), trisdimethylaminosilane (3DMAS), bisdiethylaminosilane (BDEAS), and pentakisdimethyl.
- TMA Tri-Methyl Aluminum
- TiCl 4 titanium tetrachloride
- 3DMAS trisdimethylaminosilane
- BDEAS bisdiethylaminosilane
- PDMAT Amino tantalum or the like may be used.
- the functional layer 13 contains a second inorganic substance and is formed using the precursor described above as a raw material.
- the second inorganic substance is bonded to the adsorption site located on the outer surface 12 a of the undercoat layer 12.
- a substance containing at least one element among Group III elements, Group IV elements, Group V elements, and lanthanoid elements may be used.
- an atomic layer deposition film of an inorganic substance containing at least one of the group III element, the group IV element, the group V element, and the lanthanoid element as the second inorganic substance, another component is formed. Compared with the membrane method, a higher gas barrier function can be obtained.
- the element contained in the second inorganic substance is not limited to the above element as long as a gas barrier function can be obtained.
- any element may be included as long as it is a composition that can be formed on the substrate, such as a transition element and a typical element.
- an oxide such as TaO x , SiO x , TiO x , AlO x , HfO x , NbO x , or ZrO x may be used.
- an oxide in which these plural substances are mixed for example, AlSi x O y , TiAl x O y, or the like may be used.
- the composition of the inorganic oxide include, for example, SiO X (1 ⁇ X ⁇ 2), AlO X (where X is 1 ⁇ X ⁇ 1.5), TiO X (where X is 1.5 ⁇ 1.5). X ⁇ 2).
- the composition of the functional layer 13 for example, BaTiO 3, and the gate insulating film used in a semiconductor device field, such as SrTiO 3, Ta 2 O 5, the composition used as a material of the memory element, typically a leakage current is small material
- the thickness of the functional layer 13 may be, for example, not less than 0.5 nm and not more than 200 nm. When the thickness of the functional layer 13 is less than 0.5 nm, for example, functions such as gas barrier properties may not be exhibited. When the thickness of the functional layer 13 exceeds 200 nm, there is a possibility that the cost and film formation time required for forming the functional layer 13 are excessive. In addition, cracks and the like are likely to occur due to internal stress of the film. When the thickness of the functional layer 13 is 0.5 nm or more and 200 nm or less, the functional layer 13 having a good gas barrier property can be manufactured at low cost.
- the overcoat layer 14 is disposed so as to cover the outer surface 13 a of the functional layer 13.
- the overcoat layer 14 can protect the functional layer 13 from environmental stress, particularly from a high temperature and high humidity environment, by covering the outer surface 13 a of the functional layer 13. Furthermore, since the overcoat layer 14 is formed so as to cover the functional layer 13 and the undercoat layer 12, the functional layer 13 and the undercoat layer 12 can be protected from mechanical stress.
- the overcoat layer 14 is configured to include a third inorganic substance.
- a material having environmental stress resistance and mechanical stress resistance equal to or higher than that of the second inorganic substance contained in the functional layer 13 is used.
- the third inorganic substance for example, all inorganic substances exemplified as the first inorganic substance can be used.
- the third inorganic substance used for the overcoat layer 14 and the first inorganic substance used for the undercoat layer 12 may be the same or different.
- the composition of the entire overcoat layer 14 may be the same composition as the entire undercoat layer 12 or a different composition.
- the overcoat layer 14 can be formed using the chemical vapor deposition method or the physical vapor deposition method in the same manner as the undercoat layer 12.
- the third inorganic material for the overcoat layer 14 it is possible to suppress the deterioration of the gas barrier function due to the environmental stress of the undercoat layer 12 and the functional layer 13. Furthermore, by forming the overcoat layer 14 that is the third inorganic substance on the functional layer 13, the gas barrier function of the stacked body 10 can be further improved.
- the thickness of the overcoat layer 14 is set to a thickness that can protect the undercoat layer 12 and the functional layer 13 from environmental stress or mechanical stress according to the use environment of the laminated body 10. What is necessary is just to determine according to a stress characteristic or a mechanical stress-resistant characteristic.
- the third inorganic substance is a metal oxide, a metal nitride, or a metal oxynitride as described above, it can be set as appropriate within a range of 3 nm to 2000 nm.
- the thickness of the overcoat layer 14 is less than 3 nm, there is a possibility that the protection function from environmental stress is lowered.
- the thickness of the overcoat layer 14 exceeds 2000 nm, if the overcoat layer 14 is subjected to stress such as bending or thermal expansion from the base material 11, defects such as cracks may easily occur.
- the thickness of the overcoat layer 14 is more preferably in the range of, for example, 5 nm to 300 nm. If the thickness of the overcoat layer is 5 nm or more, the protection effect from environmental stress becomes better. If the thickness of the overcoat layer is 300 nm or less, cracks due to bending of the film or expansion due to heat are less likely to occur. The protective effect against mechanical stress becomes better at a thickness of about 200 nm or more.
- FIG. 2A is a schematic cross-sectional view of a substrate used in the laminate of this embodiment.
- 2B is an enlarged view of a portion A in FIG. 2A.
- FIG. 3A is a cross-sectional view schematically showing the first layer of the atomic deposition film when a functional layer is formed on a substrate without an undercoat layer.
- FIG. 3B is an enlarged view of a portion B in FIG. 3A.
- a laminate including an atomic layer deposition film formed by the ALD method includes a thin film wireless EL, a display, a semiconductor memory (DRAM (Dynamic Random Access Memory)), and a substrate for an electronic component such as a glass substrate or a silicon substrate.
- DRAM Dynamic Random Access Memory
- a substrate for an electronic component such as a glass substrate or a silicon substrate.
- the actual situation is that research on the process of the ALD method suitable for a base material formed of a polymer material such as the base material 11 of the laminate 10 has not progressed so much.
- the atomic layer deposition film grows two-dimensionally.
- an organic polymer base material for example, PET
- the atomic layer deposition film is two-dimensional at an initial growth stage, for example, a thin film of about 1.0 nm. It is likely that they have not grown. That is, in the initial growth stage of the atomic layer deposition film using the ALD method on the outer surface of the base material formed from the polymer material, the original two-dimensional growth by the ALD method cannot be performed, and the expression of the barrier function is delayed. it is conceivable that.
- the main cause is considered to be “the density of adsorption sites” on the outer surface of the substrate and “diffusion of the precursor into the free volume region”.
- the inventors predicted that an atomic layer deposition film could be efficiently formed by forming a surface similar to a glass substrate or a silicon substrate.
- the present inventors have formed an undercoat layer formed of an inorganic material on a base material, so that an atomic layer deposited film can be two-dimensionally grown at an early stage, and a gas barrier function can be achieved. It has also been found that durability is improved due to environmental stress. That is, it has been found that using an inorganic substance on the surface on which the atomic layer deposition film grows, the growth mode is different from the case of forming the atomic layer deposition film directly on the surface of the polymer material.
- a substrate having a smooth surface (outer surface) and no free volume space such as a glass substrate or a silicon substrate
- the atomic layer deposition film is formed on this substrate.
- the precursor as a raw material is bonded to the adsorption site arranged on the outer surface (surface) and grows.
- a base material formed of a polymer material has a crystal region (crystal part) and an amorphous region (amorphous part). In this amorphous region, there is a void called a free volume. Since this void exists, for example, when the water vapor transmission rate is measured, water molecules pass through the void and permeate the substrate.
- a layer of an inorganic material layer is laminated on the upper surface of the atomic layer deposition film to reduce the gas barrier function.
- an environmental stress such as high temperature and high humidity
- a layer of an inorganic material layer is laminated on the upper surface of the atomic layer deposition film to reduce the gas barrier function.
- resistance to mechanical stress such as rubbing and pressing directly on the atomic layer deposition film is increased. Therefore, it is possible to suppress the gas barrier function from being significantly lowered when mechanical stress is applied to the laminate.
- the present inventors formed an undercoat layer containing an inorganic substance expected to have no free volume between the base material and the functional layer, and further covered the upper surface of the functional layer as a protective layer.
- an overcoat layer containing an inorganic substance was formed, the relationship with water vapor transmission rate under environmental stress or mechanical stress was studied, and the present invention was achieved.
- the adsorption site may include, for example, a chemical structure surface having an O atom or an OH group, or a chemical structure surface having an N atom or an NH x group.
- the precursor has an OH group, a COOH group, a COR group, or an NHx group, such as PET, PEN (polyethylene terephthalate), and PI, which can be chemically adsorbed.
- PET polyethylene terephthalate
- PI polyethylene terephthalate
- a void 21 in a free volume exists on the outer surface 11 a of the base material 11 before the stacked body 10 is formed.
- an atomic layer deposition film 24 is formed directly on the outer surface 11a of the substrate 11.
- the void 21 having a free volume on the outer surface 11 a has a space larger than the molecular size of the precursor 22 that is a film forming raw material of the atomic layer deposition film 24. For this reason, the precursor 22 is diffused into the free volume and chemisorbed, so that three-dimensional growth of the atomic layer deposition film 24 occurs.
- the precursor 22 is three-dimensionally adsorbed on the adsorption site existing in the void 21 and arranged in an isolated state.
- the atomic layer deposition film grows three-dimensionally with the adsorption sites as nuclei.
- the atomic layer deposition film spreads three-dimensionally by the precursor, and the precursor is sparsely adsorbed at locations such as OH groups. For this reason, the atomic layer deposition film grows in a columnar shape around the isolated nucleus, and the atomic layer deposition film cannot be formed efficiently. For this reason, it is difficult to form an ideal functional layer in the initial growth stage. For this reason, in order to form a dense film in which the atomic layer that is characteristic of the ALD method is two-dimensionally grown, a certain amount of film thickness is required until the three-dimensional unevenness in the initial growth stage is filled. .
- the film thickness is small, the film remains in the initial growth stage, so that it is impossible to ensure the film density.
- the initial performance of the gas barrier function is lowered, or the reliability of the gas barrier function is lowered.
- inorganic substances such as TaO x , SiO x , TiO x , AlO x , SiN y , and TiN y have O atoms and N atoms on the surface and have no free volume. Therefore, the two-dimensional growth delay of the atomic layer deposition film due to the penetration of the precursor can be suppressed. Furthermore, an inorganic substance can introduce an adsorption site such as an OH group by treating the surface with plasma or the like.
- the chemical adsorption to the adsorption site of the precursor of the atomic layer deposition film is considered as follows. That is, a gaseous precursor (for example, TMA: Tri-Methyl Aluminum) or a metal-containing precursor such as TiCl 4 is chemically adsorbed to the outer surface (surface) of the undercoat layer formed of an inorganic substance. This is the first step in the ALD process. At this time, the presence of the adsorption site greatly affects the chemical adsorption with the precursor, that is, the two-dimensional growth of the atomic layer deposition film.
- a gaseous precursor for example, TMA: Tri-Methyl Aluminum
- a metal-containing precursor such as TiCl 4
- the atomic layer deposition film is reversibly formed. Is adsorbed on the adsorption site.
- the OH group present in the polymer chain is adsorbed and adsorbed. Furthermore, there is no free volume in metal oxide films, metal nitride films, and the like. Therefore, the film thickness necessary for starting the two-dimensional growth is reduced.
- the inorganic substance constituting the undercoat layer 12 includes the surface having O atoms or the surface having N atoms as described above, the atomic layer deposition is performed on the adsorption site included in the surface of the undercoat layer 12.
- the precursor which is a film forming raw material (raw material for forming the functional layer 13) used when forming the film is easily adsorbed.
- the penetration and diffusion of the precursor 22 as a film forming raw material into the functional layer forming surface is eliminated.
- the precursor of the atomic layer deposition film is adsorbed on the surface of the undercoat layer. Adsorbed to a site, this site of adsorption becomes the nucleus of the atomic layer deposition film. Since there is no free volume on the surface of the inorganic substance, adjacent nuclei come into contact with each other to form a continuous film, and a denser film is formed by a two-dimensional growth mode (a stage in which a thin film grows two-dimensionally). It becomes.
- FIG. 4 is a flowchart for explaining the laminate manufacturing method of the present embodiment.
- FIG. 5A is a schematic cross-sectional view in a functional layer forming step in the method for manufacturing a laminate according to the present embodiment.
- FIG. 5B is an enlarged view of a portion D in FIG. 5A.
- Step S1 is a base material preparation process.
- the base material 11 formed from an appropriate polymer material is formed in a shape such as a plate shape or a film shape, and then placed in a vacuum chamber (not shown).
- the base material 11 may be fixed to a stage in a vacuum chamber (not shown), or may be unwound from a roll (raw material) around which the base material 11 is wound and fixed to a winding shaft.
- FIG. 2B in the non-crystalline region of the outer surface 11a of the base material 11, there is a free volume portion in which no polymer chain exists, that is, a void 21 exists.
- the surface such as plasma treatment or hydrolysis treatment for modifying or activating the outer surface 11a of the base material 11 is performed. Processing may be performed. As described above, the surface treatment of the outer surface 11 a of the substrate 11 improves the adhesion between the undercoat layer formed on the outer surface 11 a of the substrate 11 and the substrate 11.
- Step S2 is performed after step S1.
- Step S2 is an undercoat layer forming step.
- the undercoat layer 12 is formed on the outer surface 11 a of the substrate 11.
- the undercoat layer 12 containing the first inorganic substance described above by, for example, the PVD method or the CVD method is formed on the outer surface 11 a of the base material 11 disposed in a vacuum chamber (not shown).
- the PVD method for example, an induction heating method, a resistance heating method, an electron beam method, a sputtering method, or the like can be used.
- the CVD method for example, a thermal CVD method, a plasma CVD method, a photo CVD method, or the like can be used.
- the undercoat layer 12 may be formed by a sol-gel method.
- a gas containing O atoms such as O 2 is excited by plasma to replace the outer surface 12a of the undercoat layer 12 with an adsorption site such as a hydroxyl group (OH group). It may be done.
- Step S2 ends, the process proceeds to step S3.
- Steps S3 to S7 constitute a functional layer forming step E for forming the functional layer 13 described above. This step is performed by the ALD method.
- the present process will be described an example case where the Al 2 O 3 film is formed as atomic layer deposition film 24.
- the substrate 11 after step S ⁇ b> 2 is, for example, a stage (not shown) in a vacuum chamber (not shown; the same below) of an atomic layer deposition film forming apparatus (not shown, the same hereinafter). Abbreviated, the same shall apply hereinafter).
- the outer surface 12a is disposed on the upper surface.
- Step S3 is a step of supplying a precursor.
- a reactive gas / discharge gas for example, at least one of O 2 and N 2
- the reactive gas / discharge gas is supplied to the outer surface 12 a of the undercoat layer 12.
- the pressure in the vacuum chamber at this time can be appropriately set within a range of 10 Pa to 50 Pa, for example.
- plasma discharge is performed in an ICP (Inductively Coupled Plasma) mode in a vacuum chamber.
- ICP Inductively Coupled Plasma
- an output power source for plasma discharge at this time for example, a 250 W power source can be used.
- a plasma gas excitation power source for example, a 13.56 MHz power source can be used.
- the inside of the vacuum chamber is purged with gas.
- gas used when performing the gas purge for example, O 2 , N 2 or the like can be used.
- 90 degreeC can be used for the reaction temperature at the time of a gas purge, for example.
- trimethylaluminum that is a film forming raw material (precursor) is supplied to the outer surface 12a of the undercoat layer 12 as a second inorganic substance.
- a precursor serving as a raw material for forming the atomic layer deposition film 24 is supplied so as to be bonded to the adsorption site included in the outer surface 12a of the undercoat layer 12 (first step).
- step S3 is finished and the process proceeds to step S4.
- step S4 after the first step, the precursor 23 not bonded to the adsorption site is discharged out of the vacuum chamber (second step).
- the precursor 23 that is not bonded to the adsorption site is discharged out of the vacuum chamber by a vacuum pump (not shown) that exhausts from the vacuum chamber.
- a vacuum pump not shown
- the precursor 23 is vacuumed. It may be discharged out of the chamber.
- step S5 the number of executions of the first and second steps (“number of times in FIG. 4)” is a predetermined number of times determined in advance according to the film thickness of the functional layer 13 (hereinafter, “the predetermined number of times n (n Is an integer) ”). If it is determined in step S5 that the number of times the first and second steps have been performed is equal to or greater than the predetermined number n (YES), the process proceeds to step S6. In step S5, when it is determined that the number of executions of the first and second steps is less than the predetermined number n (NO), the process returns to step S3, and the processes of steps S3 and S4 are performed again.
- the predetermined number n can be set to 15 times, for example.
- the third step F shown in FIG. 4 is a step in which the first step (step S3) and the second step (step S4) are repeated a predetermined number of times.
- step S ⁇ b> 6 a reactive gas is supplied into the vacuum chamber and a voltage is applied to the reactive gas to generate plasma, and the plasma and the precursor 23 are reacted. Thereby, an atomic layer deposition film 24 having a thickness of one atomic layer is formed (fourth step).
- a reactive gas for example, O 2 , N 2 , CO 2 , H 2 , or a mixed gas obtained by mixing two or more of these gases
- the pressure in the vacuum chamber can be set to a predetermined pressure within a range of 10 Pa to 50 Pa, for example.
- plasma is generated by performing plasma discharge in an ICP (Inductively Coupled Plasma) mode in a vacuum chamber.
- ICP Inductively Coupled Plasma
- the plasma gas excitation power source used in this step for example, a 13.56 MHz power source can be used.
- H 2 O or H 2 O 2 is introduced into a vacuum chamber, plasma discharge is performed in the same ICP mode as described above, and H 2 O or H 2 is used.
- a method of forming an atomic layer deposition film 24 having a thickness of one atomic layer by reacting O 2 with the precursor 23 is mentioned.
- step S6 When the process of step S6 ends, the process proceeds to step S7.
- step S7 the total thickness of the deposited atomic layer deposition film 24 (in other words, the total thickness of the stacked atomic layer deposition film 24) is set as a target thickness of the functional layer 13 (hereinafter, referred to as “total thickness”). , which is referred to as “thickness T”).
- the thickness of the functional layer 13 is calculated by the product of the growth rate confirmed in advance and the number of cycles. If it is determined in step S7 that the total thickness of the deposited atomic layer deposition film 24 has reached the thickness T (target thickness) of the functional layer 13 (determined as YES), the functional layer formation step E The process is completed, and the process proceeds to step S8. If it is determined in step S7 that the total thickness of the deposited atomic layer deposition film 24 has not reached the thickness T of the functional layer 13 (determined as NO), the process returns to step S3, and from step S3. S6 is repeated as described above.
- the process from steps S3 to S7 is defined as one cycle, and the atomic layer deposition film 24 is formed from, for example, an Al 2 O 3 film by performing this cycle a plurality of times.
- the number of cycles can be determined in advance based on the atomic layer deposition film 24 formed in one cycle and the thickness required for the functional layer 13.
- the number of cycles may be, for example, 2 to 1000 times, and more preferably 2 to 200 times.
- the thickness T of the target functional layer 13 set in advance may be, for example, 20 nm or less.
- the functional layer forming step E by forming the functional layer 13 so that the thickness T is 20 nm or less, for example, the function of the functional layer 13 such as a gas barrier function is expressed, and cost and production are achieved. And reliability can be ensured.
- Step S8 is an overcoat layer forming step for forming the overcoat layer 14.
- the structure 25 on which the atomic layer deposition film 24 having a thickness T (see the two-dot chain line) is formed is taken out from the vacuum chamber of the atomic layer deposition film forming apparatus.
- the structure 25 is fixed on a stage (not shown, the same applies below) in a film forming chamber (not shown, the same applies below) of an overcoat layer forming apparatus (not shown, the same applies hereinafter).
- the structure 25 is fixed so that the outer surface 13a of the functional layer 13 is on the upper side.
- the overcoat layer 14 containing the third inorganic substance is formed by the PVD method or the CVD method so as to cover the outer surface 13a of the functional layer 13.
- the functional layer 13 can be protected under environmental stress, particularly in a high temperature and high humidity environment, and the undercoat layer can be protected from mechanical stress.
- the layer 12 and the functional layer 13 can be protected.
- the overcoat layer 14 includes a third inorganic material having a composition having an environmental stress resistance equal to or higher than that of the second inorganic material included in the functional layer 13, the overcoat layer 14 deteriorates due to the environmental stress.
- the functional layer 13 can be protected. For this reason, the reliability of the laminated body 10 itself can be improved by forming the overcoat layer 14.
- step S8 is completed, and the manufacturing method of the laminate according to the present embodiment is completed. Thereby, the laminated body 10 as shown in FIG. 1 is manufactured.
- the laminate 10 can be manufactured in the same manner when the laminate 10 is a gas barrier film.
- the substrate 11 is a film-like substrate.
- the laminated body 10 when the laminated body 10 is a gas barrier film, the laminated body 10 may be composed of only the laminated body 10, but for example, the laminated body 10 may be laminated on another substrate via an adhesive or the like.
- an organic light emitting element may be formed on the gas barrier film including the laminate 10.
- the gas barrier film including the laminated body 10 can protect the contents from a gas (gas) to be shielded such as oxygen or water vapor. Therefore, it may be used in various fields such as the food packaging field, medicine, electronic parts, and agricultural materials.
- the water vapor permeability of the laminate 10 included in the gas barrier film may be, for example, 0.5 g / m 2 / day [same as g / (m 2 ⁇ day)] or less.
- the water vapor permeability of the laminate 10 is larger than 0.5 g / m 2 / day, the shielding effect of oxygen and water vapor is small.
- the content is packaged with a gas barrier film, the content is chemically It becomes easy to change quality.
- the water vapor transmission rate of the laminate 10 By setting the water vapor transmission rate of the laminate 10 to 0.5 g / m 2 / day or less, the content can be protected (maintenance of the function of the content itself) by the gas barrier film.
- the undercoat layer 12 is formed on the base material 11 formed from a polymer material. Therefore, the atomic layer deposition film 24 is densely formed on the undercoat layer 12. Further, the functional layer 13 formed from the atomic layer deposition film 24 is covered with the overcoat layer 14. For this reason, the reliability of the laminated body 10 which has the base material 11 formed from the polymer material and the functional layer 13 formed of the atomic layer deposition film 24 formed on the base material 11 can be improved. According to the gas barrier film including the laminate 10, reliability and gas barrier properties can be improved.
- the undercoat layer 12 can cover the free volume in the substrate 11 and has an adsorption site for the precursor 23 on the outer surface 12a. For this reason, the precursor 23 used when forming the atomic layer deposition film 24 is easily adsorbed to the adsorption site, and a surface having no free volume can be formed. For this reason, the penetration and diffusion of the precursor 23 into the base material 11 are eliminated. As a result, the atomic layer deposition film 24 grows two-dimensionally on the outer surface 12a from the initial formation stage, and the dense atomic layer deposition film 24 is formed in a short time.
- the functional layer 13 on which the atomic layer deposition film 24 is laminated has a good gas barrier property even if it is a thin film.
- the atomic layer deposition film is formed more densely. For this reason, the atomic layer deposition film becomes chemically stable, and further, adhesion between the undercoat layer and the functional layer as the atomic layer deposition film is secured. For this reason, it becomes possible to suppress the fall of the function by environmental stress. Since the functional layer 13 is covered with the overcoat layer 14 in the laminate 10, resistance to environmental stress or mechanical stress is improved as compared with the case where the overcoat layer 14 is not provided.
- the ALD method is performed by the undercoat layer 12 formed by the undercoat lamination process in a state where there is no free volume on the outer surface 12a, and the functional layer 13 is formed.
- the substrate 11 is a polymer material and has a free volume on the outer surface 11a, there is no free volume on the outer surface 12a.
- adjacent nuclei of the atomic layer deposition film 24 come into contact with each other to form a continuous film.
- a thin film grows two-dimensionally in the two-dimensional growth mode from the initial growth stage. Therefore, the atomic layer deposition film 24 becomes a dense film at an early stage of the manufacturing stage, and a film having a high gas barrier function can be formed in a short time.
- step S3 first step of supplying the precursor
- step S4 second step of discharging the precursor
- step S6 fourth step of forming an atomic layer deposition film deposited in units of one atomic layer
- the first to fourth steps are repeated a plurality of times.
- the first to fourth steps may be performed only once. That is, the atomic layer deposition film 24 may be formed of only one atomic layer.
- FIG. 6 is a cross-sectional view schematically showing an organic light emitting device according to the second embodiment of the present invention.
- the organic light emitting device 210 of this embodiment includes a gas barrier film 220, a first electrode 213, a light emitting layer 214, a second electrode 215, and a sealing cap 216.
- FIG. 7 is a cross-sectional view schematically showing the layer structure of the gas barrier film 220.
- the gas barrier film 220 includes a film base 221, an undercoat layer 222, a functional layer 223, and an overcoat layer 224.
- the film substrate 221 is made of a polymer material.
- the film substrate 221 has an outer surface 222a on which the undercoat layer 222 is formed. Since the first inorganic substance to be the undercoat layer 222 is formed using a physical vapor deposition method or a chemical vapor deposition method, the polymer material constituting the film substrate 221 is not particularly limited. A polymer material is also applicable.
- the film substrate 221 has the same configuration as the substrate 11 in the laminate 10 according to the first embodiment.
- the thickness of the film substrate 221 is preferably, for example, in the range of 12 to 300 ⁇ m, and more preferably in the range of 12 to 100 ⁇ m.
- the undercoat layer 222 is disposed so as to cover the outer surface 221a of the film base 221 as shown in FIG.
- the undercoat layer 222 has an outer surface 222a.
- the undercoat layer 222 is composed of a film containing a first inorganic substance, and has an adsorption site on the film surface where the precursor 232 that is a film forming raw material of the atomic layer deposition film can be chemically adsorbed.
- the undercoat layer 222 has the same configuration as the undercoat layer 12 in the multilayer body 10 according to the first embodiment.
- the functional layer 223 is disposed so as to cover the outer surface 222a of the undercoat layer 222.
- the functional layer 223 has an outer surface 223a.
- an adsorption site located on the outer surface 222a of the undercoat layer 222 and a precursor that is a film forming raw material are combined. That is, the functional layer 223 is a film formed by an atomic layer deposition method (ALD method).
- the functional layer 223 has the same configuration as that of the functional layer 13 in the stacked body 10 according to the first embodiment.
- the overcoat layer 224 is disposed so as to cover the outer surface 223a of the functional layer 223.
- the functional layer 223 can be protected under environmental stress, particularly in a high temperature and high humidity environment, and the undercoat layer can be protected from mechanical stress. 222 and the functional layer 223 can be protected.
- the overcoat layer 224 has the same configuration as the overcoat layer 14 in the stacked body 10 according to the first embodiment.
- the thickness of the overcoat layer 224 can be appropriately set within a range of 3 nm or more and 1000 nm or less, for example.
- the thickness of the overcoat layer 224 is less than 3 nm, it is not preferable because there is no effect of protecting environmental stress.
- the overcoat layer 224 is thicker than 1000 nm, it is not preferable because defects such as cracks are generated due to bending or thermal expansion of the film.
- the film base 221 made of a polymer material
- the undercoat layer 222 containing the first inorganic substance formed on the outer surface 221 a of the film base 221, and the outer surface 222 a of the undercoat layer 222
- a functional layer 223 formed of a precursor containing a second inorganic substance that is composed of an atomic layer deposition film 225 and is capable of binding to an adsorption site located on the outer surface 222a of the undercoat layer 222;
- the overcoat layer 224 containing the third inorganic substance formed on the outer surface 223a of the layer 223, so that the functional layer 223, which is an atomic layer deposition film, contains the first inorganic substance having no free volume
- the atomic layer deposition film is formed on the undercoat layer 222 to enable two-dimensional growth at an early stage.
- the functional layer 223 which is an atomic layer deposition film, becomes dense, and the gas barrier function and the durability can be improved.
- the overcoat layer 224 that covers the outer surface 223a of the functional layer 223, the overcoat layer covers the water vapor permeable defects of the functional layer 223, thereby improving the gas barrier function. Furthermore, by having the overcoat layer 224, the outer surface 223a side of the functional layer 223 is protected from environmental stress, mechanical stress, and the like, and can be prevented from being deteriorated or damaged, so that the durability of the laminate 220 can be improved. Can do.
- the sealing film (not shown) according to the present embodiment includes a gas barrier film 220 shown in FIG.
- the sealing film may be composed of only the gas barrier film 220, for example. Moreover, the sealing film may have a configuration in which the gas barrier film 220 is laminated to another base material via an adhesive. The sealing film may be bonded to the organic light emitting element after forming the organic light emitting element. Moreover, you may form an organic light emitting element directly on this by making a sealing film (or gas barrier film 220) into a base material.
- the water vapor transmission rate of the gas barrier film 220 constituting the sealing film is, for example, 0.01 g / m 2 / day or less.
- the water vapor permeability of the gas barrier film 220 constituting the sealing film is greater than 0.01g / m 2 / day, will not be able to protect the organic light emitting element from oxygen and water vapor, the light emitting layer is not emit light, that is, dark spots Will occur in large numbers. Therefore, by setting the water vapor transmission rate of the gas barrier film 220 to 0.01 g / m 2 / day or less, it is possible to maintain the functions of the organic light emitting element and the electronic device including the organic light emitting element.
- FIG. 5 is a view showing a flowchart for explaining a method for producing a gas barrier film according to the present embodiment.
- the gas barrier film 220 which concerns on this embodiment can be manufactured using the method similar to the manufacturing method of the laminated body 10 which concerns on 1st Embodiment.
- undercoat layer 222 when the undercoat layer 222 is formed in step S2, the film substrate 221 fixed to the stage in the vacuum chamber or the roll (raw material) wound around the shaft in the vacuum chamber
- An undercoat layer 222 containing a first inorganic substance is formed on the outer surface 221a of the film-shaped film substrate 221 by physical vapor deposition (PVD) or chemical vapor deposition (CVD) (undercoat) Layer forming step).
- PVD physical vapor deposition
- CVD chemical vapor deposition
- the functional layer 223 may be formed so as to have a thickness of 200 mm or less. If the thickness of the functional layer 223 is greater than 200 mm, cracks and the like are likely to occur due to internal stress of the film. Therefore, reliability can be ensured by setting the thickness of the functional layer 223 to 200 nm or less. Furthermore, it is preferable to form the functional layer 223 so that the thickness is 20 nm or less. When the thickness of the functional layer 223 is larger than 20 nm, the cost is high and the productivity is deteriorated.
- the thickness of the functional layer 223 is more preferably 0.5 nm or more, for example. When the thickness of the functional layer 223 is thinner than 0.5 nm, the barrier function of the functional layer 223 is hardly exhibited.
- the overcoat layer 224 that covers the outer surface 223a of the functional layer 223 in this way, the functional layer 223 in a high temperature and high humidity environment can be protected, and also from mechanical stress.
- the undercoat layer 222 and the functional layer 223 can be protected.
- the overcoat layer 224 includes a third inorganic substance having a composition having an environmental stress resistance equal to or higher than that of the second inorganic substance contained in the functional layer 223, thereby deteriorating due to environmental stress. Since the functional layer 223 that is to be protected can be protected, the reliability of the gas barrier film 220 can be improved.
- an undercoat layer 222 containing a first inorganic substance is formed on the outer surface of a film substrate 221 made of a polymer material and placed in a vacuum chamber.
- a functional layer 223 is formed by reacting a precursor 232 serving as a film forming raw material of the atomic layer deposition film 225 with an adsorption site existing on the outer surface 222a of the undercoat layer 222 by a step of vapor deposition and an atomic layer deposition method.
- an overcoat layer forming step of forming an overcoat layer 224 containing a third inorganic material so as to cover the outer surface 223a of the functional layer 223, whereby an atomic layer deposition film 225 is formed. Is formed on the undercoat layer 222 without the precursor 232 entering the voids in the amorphous portion of the substrate 211.
- the barrier function of the functional layer 223 is expressed by a thin film (that is, has a high barrier property), and the functional layer 223 can be improved in resistance due to environmental stress or the like.
- overcoat layer 224 that covers the outer surface 223a of the functional layer 223, damage and alteration on the outer surface 223a side of the functional layer 223 can be suppressed, so that the gas barrier property of the gas barrier film 220 can be maintained.
- the overcoat layer 224 compensates for defects that allow the gas in the functional layer 223 to pass through, the barrier function is improved.
- a first electrode layer 213, a light emitting layer 214, and a second electrode layer 215 are formed on the gas barrier film 220 formed as described above, and a gas barrier film 217 is provided through an adhesive 216.
- the organic light emitting element 210 is based on the above structure, but the type of the organic layer used in the light emitting layer 214 (here, a low molecular material or a high molecular material) can be selected as appropriate, and the first electrode 213 and the light emitting layer 214
- a hole injection layer, a hole transport layer, and an electron injection layer and an electron transport layer may be formed between the second electrode 214 and the light emitting layer 214 as necessary.
- FIG. 8 is a cross-sectional view schematically showing a laminate according to the third embodiment of the present invention.
- the following description is given by taking as an example a case where a film-like base material is used as the base material 311 constituting the laminate 310.
- the laminate 310 includes a base material 311 formed of an organic polymer, an atomic layer deposition film 313, and a base layer 312.
- the base material 311 is formed from an organic polymer.
- the underlayer 31 has a functional group that is a bonding site (adsorption site) to which a precursor as a film forming raw material of the atomic layer deposition film 313 is bonded between the base material 311 and the atomic layer deposition film 313 and is empty. It is composed of an inorganic material having a small pore diameter.
- the precursors bonded to each adsorption site of the underlayer 312 with sufficient density are bonded to each other so as to be crosslinked.
- the atomic layer deposition film 313 is formed two-dimensionally with respect to the surface direction of the underlayer 312 (a surface direction parallel to the outer surface 312a).
- a gap through which gas passes in the thickness direction of the stacked body 310 is less likely to be generated in the atomic layer deposition film 313, so that the atomic layer deposition film 313 with high gas barrier properties can be realized.
- An adhesive layer (not shown) (for example, a resin layer containing an organic polymer) may be disposed between the base material 311 and the base layer 312.
- an adhesive layer for example, a resin layer containing an organic polymer
- the adhesion strength between the base material 311 and the base layer 312 can be improved.
- the substrate of the laminate that is the subject of the present invention is a substrate made of an organic polymer.
- ALD atomic layer deposition
- an organic polymer has a space where a polymer chain called free volume (free volume) does not exist, and gas diffuses and passes through the space.
- free volume free volume
- inorganic materials have pores through which gas can diffuse.
- a precursor as a film forming raw material for the atomic layer deposition film Diffuses from the outer surface (surface) of the underlayer to the inside and is adsorbed on adsorption sites scattered three-dimensionally, and the adsorption sites become the nucleus of the atomic layer deposition film.
- a three-dimensional growth mode is obtained until nuclei existing at adjacent positions come into contact with each other to form a continuous film, and thereafter, a two-dimensional growth mode is obtained.
- an atomic layer deposition film is formed on the outer surface of an underlayer made of an inorganic material having large pores by an ALD method, a dense film is formed by two-dimensional growth from the start of the atomic layer deposition film formation process. The period until it becomes longer. For this reason, if the thickness of the atomic layer deposition film is reduced, the portion where the two-dimensional growth of the atomic layer deposition film is dense becomes very small.
- the gas barrier property of the atomic layer deposition film is lowered, and gas passes through the gap formed in the atomic layer deposition film.
- the present inventors provide an underlayer made of an inorganic material having a small pore diameter on the outer surface of the base made of an organic polymer. It came to the idea of providing.
- the adsorption sites of precursors which are the raw materials for forming the atomic layer deposition film, are arranged two-dimensionally and densely on the outer surface (surface) of the organic polymer substrate.
- a base layer made of an inorganic material having a small pore diameter is provided on the outer surface (surface) of the base made of an organic polymer.
- the stacked body 310 of this embodiment includes a base material 311, a base layer 312, and an atomic layer deposition film 313.
- the base material 311 is made of an organic polymer.
- the base material 311 has an outer surface 311a on which the base layer 312 is formed.
- Examples of the organic polymer constituting the substrate 311 include polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), nylon, polyimide (PI), and polycarbonate. (PC), polyethersulfone (PES), and the like can be used.
- the same base material as in the first and second embodiments can be used.
- the underlayer (undercoat layer) 312 is disposed on at least a part of the outer surface 311 a of the base material 311.
- the underlayer 312 is made of an inorganic material having a small hole diameter, and has an outer surface 312a on which the atomic layer deposition film 313 is formed. That is, the outer surface 312a (surface) of the underlayer 312 has fewer holes for the precursor to diffuse into the underlayer 312 than the outer surface (surface) of the underlayer disclosed in Patent Document 7, Or it does not exist.
- the inorganic material contained in the underlayer 312 is, for example, at least one selected from the group consisting of Al, Si, Ti, Zn, Sn, Ta, Hf, W, Nb, V, Ti, Ge, Co, and Ni. And may be any of oxides, nitrides, and mixtures of oxides and nitrides of the inorganic material. That is, the foundation layer 312 can have the same inorganic material as the undercoat layers of the first and second embodiments.
- the maximum hole diameter of the foundation layer 312 is preferably 1.0 nm or less.
- the maximum pore diameter exceeds 1.0 nm, the pore diameter becomes large compared to the molecular size of many precursors used in the ALD method. Therefore, in order to obtain a high gas barrier property, it is necessary to increase the thickness of the atomic layer deposition film 313 (for example, 3 nm or more) before the precursor diffuses into the base layer 312 and closes the holes in the base layer 312. Since it is necessary, it is not preferable.
- a pulse beam type positron lifetime measuring apparatus (PALS apparatus, for example, PALS-1 (trade name) manufactured by Fuji Imback Co., Ltd.) by the positron annihilation method. ) was used to evaluate the maximum pore diameter of the underlayer 312.
- the maximum hole diameter of the base layer 312 is 0.0001 when the existence probability of all the holes whose diameter is 10 nm or less is 1 in the measurement of the hole diameter by the PALS apparatus.
- the one having the largest hole diameter is the maximum hole diameter.
- the thickness of the base layer 312 is, for example, preferably from 1.0 nm to 1000 nm, and more preferably from 10 nm to 100 nm. If the thickness of the underlayer 312 is less than 1.0 nm, the density of adsorption sites is insufficient, so that the atomic layer deposition film 313 having a sufficient water vapor barrier property cannot be formed. On the other hand, if the thickness of the underlayer 312 exceeds 1000 nm, a large amount of material and film formation time are required, and further, cracks and defects occur in the underlayer 312, which is not preferable.
- the adsorption site can be densified by plasma etching or hydrolysis treatment of the outer surface 312a of the base layer 312.
- the inorganic material included in the base layer 312 may be selected from inorganic oxides in which MOM is ring-opened by plasma etching or the like to form M-OH groups.
- the base layer 312 is arranged so as to cover the outer surface 311 a of the base material 311 has been described as an example.
- the base layer 312 is at least the outer surface 311 a of the base material 311. It suffices if it is arranged in part, and it is not limited to the configuration shown in FIG.
- the base layer 312 is arranged so that the outer surface 311 a of the base material 311 and the base layer 312 are in contact with each other has been described as an example.
- an adhesion layer (not shown) (for example, a resin layer containing an organic polymer) may be disposed between the base material 311 and the base layer 312.
- the adhesion strength between the base material 311 and the base layer 312 can be improved by disposing the adhesive layer between the base material 311 and the base layer 312.
- the atomic layer deposition film (functional layer) 313 is disposed on at least a part of the outer surface 312 a of the base layer 312.
- the atomic layer deposition film 313 contains a precursor (for example, a metal-containing precursor such as TMA: Tri-Methyl Aluminum or TiCl 4 ) as a film forming raw material of the atomic layer deposition film 313 and the outer surface 312 a of the base layer 312.
- a precursor for example, a metal-containing precursor such as TMA: Tri-Methyl Aluminum or TiCl 4
- the atomic layer deposition film 313 for example, an inorganic oxide film containing an inorganic oxide such as Al, Ti, Si, Zn, Sn, Zr, Hf, Ta, a nitride film or an oxynitride film containing these inorganic oxides. Can be used.
- the thickness of the atomic layer deposition film 313 is, for example, preferably from 0.5 nm to 200 nm, and more preferably from 1 nm to 50 nm. If the thickness of the atomic layer deposition film 313 is less than 0.5 nm, the atomic layer deposition film 313 having a sufficient water vapor barrier property cannot be formed from the viewpoint of manufacturing technology. On the other hand, if the thickness of the atomic layer deposition film 313 exceeds 200 nm, many materials and a long film formation time are required, which is not preferable. Therefore, by setting the thickness of the atomic layer deposition film 313 within the range of 0.5 nm or more and 200 nm or less, the atomic layer deposition film 313 having a sufficient water vapor barrier property can be obtained in a short time.
- the atomic layer deposition film 313 is disposed so as to cover the outer surface 312 a of the base layer 312 is described as an example.
- the atomic layer deposition film 313 is formed of the base layer 312. What is necessary is just to arrange
- the base material 311 made of an organic polymer
- the base layer 312 made of an inorganic material having a small pore diameter, disposed on at least a part of the outer surface 311a of the base material 311,
- an atomic layer deposition film 313 disposed on at least a part of the outer surface 312a of the base layer 312. This shortens the period from the start of the formation process of the atomic layer deposition film 313 to the formation of a dense film by two-dimensional growth.
- the thickness of the atomic layer deposition film 313 is reduced (for example, not less than 0.5 nm and not more than 200 nm), it is possible to increase the dense portion of the two-dimensional growth of the atomic layer deposition film 313. Even when the thickness of the layer deposition film 313 is reduced, sufficient gas barrier properties can be obtained.
- the atomic layer deposition film 313 has a sufficient gas barrier property, a laminate 310 having a high gas barrier property can be obtained.
- the water vapor transmission rate of the laminate 310 may be, for example, 1.0 ⁇ 10 ⁇ 2 g / (m 2 ⁇ day) or less. If the water vapor permeability of the laminate 310 is greater than 1.0 ⁇ 10 ⁇ 2 g / (m 2 ⁇ day), it can be used in food packaging, but the properties change with a small amount of moisture. It is impossible to protect the electronic member. Therefore, by making the water vapor transmission rate of the laminate 310 1.0 ⁇ 10 ⁇ 2 g / (m 2 ⁇ day) or less, it can be used as a protective layer for an electronic member, which is one of the application examples of the present invention. Can do.
- an overcoat layer may be disposed so as to cover the outer surface of the atomic layer deposition film 313 as in the first and second embodiments.
- the manufacturing method of the laminated body 310 of this embodiment is demonstrated.
- the base layer 312 is formed on at least a part of the outer surface 311a of the base material 311 formed from an organic polymer (base layer forming step).
- the underlayer 312 is formed by, for example, a PVD method (eg, induction heating method, resistance heating method, electron beam evaporation method, sputtering method, etc.) or a CVD method (eg, thermal CVD method, plasma CVD method, photo CVD method, etc.). It can be formed by a method.
- the underlayer 312 containing SiO x .
- the base material 311 on which the base layer 312 is not formed is fixed to a stage in a vacuum chamber (not shown).
- the pressure in the vacuum chamber pressure before film formation
- the temperature in a vacuum chamber can be 30 degreeC, for example.
- an electron is applied to at least a part of the outer surface 311 a of the base material 311.
- a base layer 312 containing SiO x (X is 1.0 or more and 2.0 or less) is formed using a beam evaporation method. Thereby, the base layer 312 having a maximum pore diameter of 1.0 nm or less can be formed.
- the contact layer is formed before performing the said base layer formation process.
- the adhesion layer is formed by applying a coating liquid (a liquid that becomes a base material of the adhesion layer) to the outer surface 311a of the base material 311 using a wire bar, and then drying the coating liquid.
- the coating liquid is, for example, a copolymer of poly (2-hydroxyethyl methacrylate) and polymethyl methacrylate, and the poly (2-hydroxyethyl methacrylate) is 35 mol% in the copolymer.
- the organic polymer contained in the ratio is prepared by dissolving in a mixed solution of methyl ethyl ketone and cyclohexanone.
- the adhesion layer is not an essential component of the present invention, and may be provided as necessary.
- a precursor as a film forming material is supplied to the outer surface 312a of the base layer 312 in the base layer 312, and an atomic layer deposition film 313 is formed on at least a part of the outer surface 312a of the base layer 312 (atomic layer deposition).
- Film formation step That is, in the atomic layer deposition film forming step, it is preferable to form the atomic layer deposition film 313 using an atomic layer deposition method (ALD method). Thereby, the laminated body 310 is manufactured.
- ALD method atomic layer deposition method
- the following method can be used. First, the base material 311 on which the base layer 312 is formed is fixed on a stage (not shown) in a film forming chamber (not shown) of an atomic layer deposition film forming apparatus (not shown).
- the pressure in the film formation chamber (pressure before film formation) is set to 0.5 Pa
- at least one of the reactive gas and discharge gas for example, O 2 and N 2 .
- the reaction gas and discharge gas are supplied to the outer surface 312a of the base layer 312 (step 1).
- the pressure in the film forming chamber can be set as appropriate within a range of 10 Pa to 50 Pa, for example.
- a plasma gas excitation power source for example, a 13.56 MHz power source can be used.
- plasma discharge is performed in an ICP (Inductively Coupled Plasma) mode in the film formation chamber (step 2).
- the output power of the plasma discharge can be set to, for example, 250 Watt.
- the inside of the film forming chamber is purged with gas (step 3).
- gas for example, O 2 or N 2 can be used as the gas used when performing the gas purge.
- the reaction temperature at the time of the gas purge can be set to 90 ° C., for example.
- trimethylaluminum which is a film forming raw material (precursor)
- purge gases for example, Ar and N 2
- steps 4 and 5 are simultaneously supplied into the film forming chamber.
- purge gases for example, Ar and N 2
- a reactive gas / discharge gas for example, O 2
- the pressure in the film forming chamber can be set to a predetermined pressure within a range of 10 Pa to 50 Pa, for example.
- plasma discharge is performed in an ICP (Inductively Coupled Plasma) mode in the film formation chamber (step 6), and an atomic layer Al 2 O 3 film (atomic layer deposition film 313 of the atomic layer deposition film 313 is formed on the outer surface 312a of the base layer 312. Part).
- ICP Inductively Coupled Plasma
- an atomic layer Al 2 O 3 film atomic layer deposition film 313 of the atomic layer deposition film 313 is formed on the outer surface 312a of the base layer 312. Part.
- the plasma gas excitation power source used at this time, for example, a 13.56 MHz power source can be used.
- only purge gases for example, Ar and N 2 ) are supplied into the film forming chamber (step 7).
- step 4 to step 7 is defined as one cycle, and the atomic layer deposition film 313 made of the Al 2 O 3 film is formed by performing this cycle a plurality of times.
- the outer surface 312a of the underlayer 312 is subjected to surface treatment (for example, plasma treatment (plasma etching treatment), corona treatment, alkali treatment, etc.) before the atomic layer deposition film forming step, thereby adsorbing the outer surface 312a of the underlayer 312. Site reactivity and density may be improved.
- surface treatment for example, plasma treatment (plasma etching treatment), corona treatment, alkali treatment, etc.
- an inorganic material is used for at least a part of the outer surface 311a of the base material 311 made of an organic polymer disposed in a vacuum chamber (not shown), and the maximum empty space is obtained.
- the period from the start of the formation process of the atomic layer deposition film 313 to the formation of a dense film by two-dimensional growth is shorter than in the past (in other words, the precursor is less likely to enter the free volume space). ). Therefore, even if the thickness of the atomic layer deposition film 313 is reduced (for example, 0.5 nm), it is possible to increase the dense portion of the two-dimensional growth of the atomic layer deposition film 313. Therefore, the atomic deposition film 313 Even when the thickness is reduced, sufficient gas barrier properties can be obtained.
- the atomic layer deposition film 313 has a sufficient gas barrier property, a laminate 310 having a high gas barrier property can be obtained.
- Examples 1 to 7 of the laminate of the above embodiment will be described together with Comparative Examples 1 to 10.
- the present invention is not limited to the following Examples 1 to 7.
- Table 1 shows the configurations and evaluation results of the laminates of Examples 1 to 3 and Comparative Examples 1 to 4.
- the reference numerals are omitted.
- Example 1 A method for manufacturing the laminated body of Example 1 (hereinafter referred to as “laminated body 10-1”, which is omitted in Table 1) will be described.
- an undercoat layer 12 formed of a Ta 2 O 5 film having a thickness of 20 nm was formed on the outer surface 11a of the substrate 11 by a sputtering method (undercoat layer forming step).
- a Ta 2 O 5 film having a thickness of 20 nm was formed on the outer surface 11a of the substrate 11 accommodated in the vacuum chamber by reactive sputtering using a Ta target.
- the functional layer 13 formed of an Al 2 O 3 film (atomic layer deposition film 24) having a thickness of 10 nm was formed on the outer surface 12a of the undercoat layer 12 (functional layer forming step).
- TMA as a film forming raw material (precursor)
- N 2 as a purge gas
- TMA as a film forming raw material (precursor)
- N 2 as a purge gas
- O 2 and N 2 as purge gases are supplied into the vacuum chamber while evacuating from the vacuum chamber, whereby the precursor 23 that is not bonded to the adsorption site existing on the outer surface 12a of the undercoat layer 12 is vacuumed.
- the chamber was drained (second step).
- the time for supplying O 2 and N 2 was 10 seconds.
- the supply amounts of O 2 and N 2 were 100 sccm, respectively.
- the temperature in the vacuum chamber at this time was 90 ° C.
- the cycle of the first step and the second step was repeated 15 times (third step).
- O 2 was supplied into the vacuum chamber as a reaction gas that also served as a discharge gas for 10 seconds, and plasma discharge was performed in the ICP mode. Thereby, a voltage was applied to O 2 to generate plasma.
- a voltage was applied to O 2 to generate plasma.
- an atomic layer deposition film 24 having a thickness of one atomic layer was formed (fourth step).
- a 13.56 MHz power source was used as the plasma gas excitation power source.
- the thickness of the atomic layer deposition film 24 when the first to fourth steps were performed once was 0.14 nm (1.4 mm). Therefore, an Al 2 O 3 film (functional layer 13) having a thickness of 10 nm was formed by performing a cycle from the first step to the fourth step 73 times. Thus, the structure 25 was formed.
- an overcoat layer 14 formed of a Ta 2 O 5 film having a thickness of 20 nm was formed on the outer surface 13a of the functional layer 13 by a sputtering method (overcoat layer forming step). Specifically, a Ta 2 O 5 film having a thickness of 20 nm was formed on the outer surface 13a of the functional layer 13 in the structure 25 accommodated in the vacuum chamber by performing reactive sputtering using a Ta target. As a result, a laminate 10-1 of Example 1 as shown in Table 1 was manufactured.
- Example 2 In the laminated body of Example 2 (hereinafter referred to as “Laminated body 10-2”; reference numeral omitted in Table 1), the material of the functional layer 13 was replaced with AlSi x O y as shown in Table 1. Except for this, it has the same configuration as the laminate 10-1.
- the laminate 10-2 was produced in the same manner as the laminate 10-1 except for the functional layer forming step. Specifically, in the functional layer formation step, trimethylaluminum and trisdimethylaminosilane were alternately deposited as the precursor 23 to form an AlSi x O y film having a thickness of 10 nm as the functional layer 13.
- Example 3 The laminate of Example 3 (referred to as “laminate 10-3” in the following description; reference numeral omitted in Table 1), as shown in Table 1, except that the thickness of the overcoat layer 14 is 300 nm.
- the structure is the same as that of the laminate 10-1.
- the layered product 10-3 was manufactured in the same manner as the method for manufacturing the layered product 10-1, except for the amount of film formation in the overcoat layer forming step.
- Example 4 A laminate (gas barrier film) was obtained in the same manner as in Example 1. By forming the first electrode layer, the light emitting layer, and the second electrode layer on this laminate (gas barrier film) and forming a sealing cap, the organic light emitting device 210 having the laminated structure shown in FIG. Formed.
- Example 5 A laminate (gas barrier film) was obtained in the same manner as in Example 2. A first electrode layer, a light emitting layer, and a second electrode layer are formed on this laminate (gas barrier film) in the same manner as in Example 4, and a sealing cap is formed, whereby the laminate structure shown in FIG. 6 is obtained. An organic light emitting device 210 having the same was formed.
- Example 6 With reference to FIGS. 8A and 8B, a method for manufacturing the laminate of Example 6 will be described.
- a coating liquid was applied to the outer surface 311a of a base material 311 made of a polyethylene terephthalate (PET) film having a thickness of 100 ⁇ m (A4100 (model number) manufactured by Toyobo Co., Ltd.) using a wire bar, and dried.
- An adhesion layer (not shown) having a thickness of 0.1 ⁇ m was formed.
- the coating solution was a copolymer of poly (methacrylic acid-2-hydroxyethyl) and polymethyl methacrylate, and the poly (methacrylic acid-2-hydroxyethyl) was 35 mol% in the copolymer.
- the organic polymer contained in the ratio was prepared by dissolving in a mixed solution of methyl ethyl ketone and cyclohexanone.
- the base material 311 on which the adhesion layer is formed is placed in a vacuum chamber, and an SiO 1.6 film having a thickness of 30 nm as an underlayer 312 is formed on the outer surface (surface) of the adhesion layer by an electron beam evaporation method. (Film having a composition of SiO 1.6 ) was formed.
- the pressure in the vacuum chamber before film formation was set to 2 ⁇ 10 ⁇ 3 Pa, and the pressure in the vacuum chamber during film formation was set to 1 ⁇ 10 ⁇ 2 Pa.
- an Al 2 O 3 film having a thickness of 0.6 nm was formed as an atomic layer deposition film 313 on the outer surface 312a of the base layer 312 by ALD.
- an Al 2 O 3 film having a thickness of 0.6 nm was formed by the following method. First, after the pressure in the film formation chamber (pressure before film formation) was set to 0.5 Pa, O 2 was supplied as a reaction gas and a discharge gas to the outer surface 312a of the base layer 312 accommodated in the film formation chamber. (Step 1). Next, after the plasma discharge, the film formation chamber was purged with gas (step 2). In the gas purge, O 2 and N 2 were supplied as purge gases for 10 seconds. The reaction temperature at this time was 90 ° C.
- TMA trimethylaluminum
- N 2 was supplied as a purge gas into the film forming chamber (step 4).
- O 2 is supplied as a reactive gas and a discharge gas, and plasma discharge is performed in the ICP mode in the film formation chamber (step 5), and an atomic layer Al 2 O 3 film (atom) is formed on the outer surface 312a of the base layer 312. Part of the layer deposition film 313) was formed.
- a power source for plasma gas excitation used at this time, a power source of 13.56 MHz was used. At this time, the pressure in the film forming chamber was set to 40 Pa.
- N 2 was supplied as a purge gas into the film forming chamber (step 6).
- step 3 to step 6 is one cycle, and this cycle is repeated to form an Al 2 O 3 film (atomic layer deposition film 313) having a thickness of 0.6 nm. In this way, the laminate of Example 6 was produced.
- Example 7 With reference to FIGS. 8A and 8B, a method for manufacturing the laminate of Example 7 will be described.
- the laminated body of Example 7 was made by the same method as that of the laminated body of Example 6 except that the thickness of the atomic layer deposition film 313 constituting the laminated body of Example 7 was changed to 10 nm. Produced.
- Comparative Example 1 The laminate of Comparative Example 1 (referred to as “laminate E-1” in the following description; not shown in Table 1) has no undercoat layer 12 and overcoat layer 14 as shown in Table 1. Has the same configuration as that of the laminate 10-1.
- the functional layer 13 is directly formed on the outer surface 11a of the substrate 11, and the outermost surface is the functional layer 13.
- Comparative Example 2 The laminate of Comparative Example 2 (hereinafter referred to as “laminate E-2”; reference numeral omitted in Table 1), as shown in Table 1, except that the overcoat layer 14 was not provided. It has the same configuration as 10-1.
- the layered product E-2 was manufactured in the same manner as the method for manufacturing the layered product 10-1, except that the overcoat layer forming step was not performed.
- Comparative Example 3 The laminate of Comparative Example 3 (referred to as “laminate E-3” in the following description; reference numerals omitted in Table 1), as shown in Table 1, except that the laminate 10 does not have an overcoat layer. -2 has the same configuration. Laminate E-3 was produced in the same manner as the laminate 10-2, except that the overcoat layer forming step was not performed.
- Comparative Example 4 is a 25 ⁇ m thick PI substrate prepared for measuring the water vapor transmission rate of the substrate 11 used in Examples 1 to 3 and Comparative Examples 1 to 3, and is the substrate 11. . Therefore, Comparative Example 4 is not a laminate, but in the following description, for convenience, it is referred to as “laminate E-4” (reference numeral omitted in Table 1).
- Comparative Example 5 An organic light emitting device was formed by forming a first electrode layer, a light emitting layer and a second electrode layer on the laminate of Comparative Example 1 in the same manner as in Example 4 and forming a sealing cap.
- Comparative Example 6 A first electrode layer, a light emitting layer, and a second electrode layer were formed on the laminate of Comparative Example 2 in the same manner as in Example 4, and an organic light emitting element was formed by forming a sealing cap.
- Comparative Example 7 An organic light emitting device was formed by forming a first electrode layer, a light emitting layer, and a second electrode layer on the laminate of Comparative Example 3 in the same manner as in Example 4 and forming a sealing cap.
- Comparative Example 8 In Comparative Example 8, only the pressure during film formation was changed to 9 ⁇ 10 ⁇ 2 Pa in the step of forming the base layer 312 (see FIG. 8) performed in Example 6. Next, an Al 2 O 3 film having a thickness of 0.6 nm was formed as the atomic layer deposition film 313 on the outer surface 312a of the base layer 312 by the same method (ALD method) as in Example 6. With such a method, the laminate of Comparative Example 8 was produced.
- ALD method Al 2 O 3 film having a thickness of 0.6 nm
- Comparative Example 9 In Comparative Example 9, only the pressure during film formation was changed to 9 ⁇ 10 ⁇ 2 Pa in the step of forming the base layer 312 (see FIG. 8) performed in Example 7. Next, an Al 2 O 3 film having a thickness of 10 nm was formed as the atomic layer deposition film 313 on the outer surface 312a of the base layer 312 by the same method (ALD method) as in Example 7. With such a method, the laminate of Comparative Example 9 was produced.
- ALD method Al 2 O 3 film having a thickness of 10 nm
- Comparative Example 10 Comparative Example 10
- a polyethylene terephthalate (PET) film having a thickness of 100 ⁇ m (A4100 (manufactured by Toyobo Co., Ltd.) was used without performing the step of forming the atomic layer deposition film 313 (see FIG. 8) performed in Example 6 or 7.
- SiO 1.6 having a thickness of 30 nm was formed as a base layer 312. With such a method, a laminate of Comparative Example 10 was produced.
- ⁇ Evaluation method> The laminates of Examples 1 to 4 and the laminates of Comparative Examples 1 to 3 were evaluated by a durability test and a mechanical stress test. However, as shown in Table 1, the durability test was performed using the laminates of Examples 1 and 2 and the laminates of Comparative Examples 1 to 3. The mechanical stress test was performed using the laminate of Example 3 and the laminate of Comparative Example 2. In each test, the water vapor transmission rate before and after each test was compared. The water vapor transmission rate was measured using PERMATRAN (registered trademark) which is a water vapor transmission rate measuring device manufactured by MOCON or AQUATRAN (registered trademark) which is a high sensitivity water vapor transmission measuring device manufactured by MOCON.
- PERMATRAN registered trademark
- AQUATRAN registered trademark
- AQUATRAN registered trademark
- the lower limit of measurement of PERMATRAN is 0.02 (g / m 2 / day).
- the measurement lower limit of AQUAQTRAN registered trademark
- All of the water vapor transmission rates were measured using N 2 gas adjusted to a temperature of 40 ° C. and a humidity of 90% RH.
- a water-vapor-permeation rate is 0.5 (g / m ⁇ 2 > / day) or less, for example.
- the durability test was performed by boiling pure water and exposing water vapor to the laminates 10-1, 10-2, E-1 to E-3 for 5 minutes.
- the water vapor permeability of each laminate after this durability test was 1.0 ⁇ 10 ⁇ 2 (g / m 2 / day).
- the water vapor permeability of the laminate 10-2 was 5.0 ⁇ 10 ⁇ 4 (g / m 2 / day) or less.
- the water vapor permeability of the laminate E-1 was 1.21 (g / m 2 / day).
- the water vapor permeability of the laminate E-2 was 1.17 (g / m 2 / day).
- the water vapor permeability of the laminate E-3 was 0.07 (g / m 2 / day).
- the mechanical stress test was performed by laminating the laminates 10-3 and E-2 on a long film and winding the film once around a 3-inch (7.62 cm) core. When the laminate was wound around the core, the laminate was rubbed and mechanical stress such as pressing stress was applied.
- the water vapor permeability of the laminate 10-3 after the mechanical stress test was 1.30 ⁇ 10 ⁇ 3 (g / m 2 / day).
- the water vapor permeability of the laminate E-2 was 0.58 (g / m 2 / day).
- the water vapor transmission rate WVTR (g / m 2 / day) was measured before the durability test and after the durability test.
- the water vapor transmission rate WVTR was measured using AQUATRAN (registered trademark), which is a highly sensitive water vapor transmission rate measuring device manufactured by MOCON.
- the water vapor transmission rate was measured in an N 2 gas atmosphere adjusted to a temperature of 40 ° C. and a humidity of 90% RH.
- the durability test was carried out by putting the gas barrier films of Examples 4 and 5 and Comparative Examples 5 to 7 into a PCT (Pressure Cooker Test) acceleration tester and holding them for 24 hours.
- the temperature in the acceleration tester was 105 ° C., and the humidity was 100% RH.
- the water vapor transmission rate after the durability test was measured using AQUATRAN (registered trademark) which is a high-sensitivity water vapor transmission rate measuring device manufactured by MOCON or PERMATRAN (registered trademark) which is a water vapor transmission rate measuring device.
- the water vapor transmission rate was measured in an N 2 gas atmosphere adjusted to a temperature of 40 ° C. and a humidity of 90% RH.
- the water vapor transmission rates of the laminates before each test are as follows.
- the water vapor transmission rates of the laminates (gas barrier films) 10-4 and 10-5 of Examples 4 and 5 are both AQUIQTRAN (registered).
- the measurement lower limit value of the trademark was 5.0 ⁇ 10 ⁇ 4 (g / m 2 / day) or less (in Table 2, expressed as “ ⁇ 5.0 ⁇ 10 ⁇ 4 ”).
- the water vapor permeability of the laminate E-5 of Comparative Example 5 was 4.1 ⁇ 10 ⁇ 4 (g / m 2 / day).
- the water vapor permeability of the laminates E-6 and E-7 of Comparative Examples 6 and 7 was 5.0 ⁇ 10 ⁇ 4 (g / m 2 / day) or less.
- the laminate (gas barrier film) 10-4 of Example 4 had a water vapor transmission rate of 0.45 (g / m 2 / day), and the laminate (gas barrier film) 10-5 of Example 5
- the water vapor permeability is 5.0 ⁇ 10 ⁇ 4 (g / m 2 / day) or less
- the water vapor permeability of the laminate E-5 of Comparative Example 5 is 1.21 (g / m 2 / day)
- the laminate E-6 had a water vapor permeability of 1.17 (g / m 2 / day)
- the laminate E-7 of Comparative Example 7 had a water vapor permeability of 0.07 (g / m 2 / day). It was.
- Table 2 The results are shown in Table 2.
- Table 2 shows the measured values of the water vapor transmission rate before and after the durability test and the light emission area ratio.
- the maximum thickness of the underlayer 312 was measured using a positron annihilation method pulse beam type positron lifetime measuring device (PALS-1 (trade name) manufactured by Fuji Inback Co., Ltd.). The pore diameter was evaluated. Note that the maximum hole diameter of the underlayer 312 is present when the existence probability of all holes having a diameter of 10 nm or less is set to 1 in the measurement of the hole diameter by the pulse beam type positron lifetime measuring apparatus. Among holes having a probability of 0.0001 or more, the hole has the largest hole diameter.
- the thickness of 100 ⁇ m was used without performing the step of forming the atomic layer deposition film 313 (see FIG. 8) performed in Examples 6 and 7 or Comparative Examples 8 and 9.
- PET polyethylene terephthalate
- the water vapor permeability of the laminate 10-1 of Example 1 after the durability test is the same as that of the laminate E-2, overcoat layer 14 and undercoat of Comparative Example 2 that does not have the overcoat layer 14.
- the water vapor permeability of the laminate E-1 of Comparative Example 1 having no coat layer 12 was about 1/8. It can be seen that the laminated body 10-1 has much higher gas barrier properties than the laminated bodies E-1 and E-2 and has high durability even after the durability test is performed. This is because the laminated bodies E-1 and E-2 do not have the overcoat layer 14, and thus the Al 2 O 3 film reacts with moisture and deteriorates.
- the laminate E-1 has a significantly lower water vapor transmission rate than the laminate 10-1 even before the durability test. However, since the laminate E-1 does not have the undercoat layer 12, the Al 2 O 3 film itself is dense. This is thought to be due to lack of sex.
- the laminate 10-2 of Example 2 maintained a better water vapor transmission rate after the durability test than the laminate 10-1. This is because, considering that the water vapor permeability of the laminate E-3 after the durability test is about 45% of the laminate E-1 after the durability test, the AlSi x O y film itself This is presumably because the resistance to moisture is higher than the resistance of the Al 2 O 3 film.
- the precursor 223 is chemically adsorbed on the adsorption site existing on the outer surface 222a of the undercoat layer 222 to form the functional layer 23, and then the overcoat layer 224 is sequentially formed on the outer surface 223a of the functional layer 223.
- Comparative Example 5 since the functional layer was formed directly on the outer surface of the film base material, it was difficult to develop gas barrier properties even before the durability test (in other words, 10 nm had an intermediate gas barrier property). there were). Moreover, since there was no overcoat layer, the functional layer deteriorated after the durability test, and it was confirmed that a low water vapor transmission rate (in other words, a high gas barrier property) could not be ensured.
- the undercoat layer having an adsorption site capable of binding the precursor, which is a raw material for forming the atomic layer deposition film, on the outer surface of the film substrate, and the adsorption site existing on the outer surface of the undercoat layer The precursor is chemisorbed and functional layers are sequentially formed. Therefore, a low water vapor transmission rate (in other words, a high gas barrier property) was confirmed before the durability test. However, since there was no overcoat layer, the functional layer deteriorated after the durability test, and it was confirmed that a low water vapor transmission rate (in other words, a high gas barrier property) could not be ensured.
- the undercoat layer having an adsorption site capable of binding the precursor, which is the film forming raw material of the atomic layer deposition film, on the outer surface of the film substrate, and the adsorption site existing on the outer surface of the undercoat layer The precursor is chemisorbed to form a functional layer. Therefore, a low water vapor transmission rate (in other words, a high gas barrier property) was confirmed before the durability test. However, since there is no overcoat layer, the water vapor transmission rate is higher after the durability test than before the test, and the functional layer deteriorates after the durability test, ensuring a low water vapor transmission rate (in other words, a high gas barrier property). It was confirmed that it was not possible.
- an Al 2 O 3 film that is not chemically stable to water vapor is used for the functional layer 223.
- the undercoat layer 222 and the overcoat layer 224 it is possible to suppress a rapid deterioration in performance against water vapor to some extent, and to reduce the light emitting area ratio of the element after the environmental test, that is, to a certain extent, the organic light emitting element. It was confirmed that it could be suppressed.
- the gas barrier film of Example 5 can maintain a high gas barrier function even after the durability test, it was confirmed that there was almost no decrease in the light emitting area ratio of the element after the environmental test, that is, the performance of the organic light emitting element. .
- the gas barrier film of Comparative Example 5 had a gas barrier function that decreased to the same extent as that of the PI film alone after the durability test. .
- Comparative Example 7 Although the evaluation result of Comparative Example 7 is better than the evaluation result of Example 4, the chemical stability of the AlSi x O y film against water vapor is extremely higher than that of the Al 2 O 3 film. Because. However, from the comparison between Example 4 and Comparative Example 6 and the comparison between Example 5 and Comparative Example 7, when the composition of the functional layer 223 is the same, providing the overcoat layer 224 provides barrier properties and durability. It is clear that the performance is improved.
- the gas barrier film 220 of the present invention has the functional layer 223 formed by forming the surface on which the atomic layer deposition film 223 is formed on the outer surface 222a of the undercoat layer 222 containing an inorganic material.
- the film can be formed stably, and a low water vapor transmission rate can be secured with a thin film thickness.
- the overcoat layer 224 on the outer surface 223a of the functional layer 223, the functional layer 223 can be protected, and deterioration of the functional layer 223 due to a durability test such as exposure to water vapor is suppressed and durability is improved.
- the organic light emitting device formed using the gas barrier film can suppress a decrease in the light emitting area ratio due to exposure in the environmental test, that is, an increase in dark spots.
- the performance of the organic light emitting device and the electronic device including the organic light emitting device can be improved.
- the gas barrier property and durability of the gas barrier film 220 were improved as compared with the conventional configuration, and the performance and long-term quality of the organic light emitting device and the electronic device equipped with the organic light emitting device could be ensured.
- Example 7 ⁇ Evaluation results of water vapor permeability of the laminates of Example 7 and Comparative Example 9> Referring to Table 3, the laminated body of Example 7 has a water vapor transmission rate of 2.0 ⁇ 10 ⁇ 3 g / (m 2 ⁇ day) and 1.0 ⁇ 10 ⁇ 2 g / (m 2 ⁇ day) It was confirmed that it had the following good water vapor barrier properties. On the other hand, in the laminate of Comparative Example 9, the water vapor transmission rate was 7 ⁇ 10 ⁇ 2 g / (m 2 ⁇ day), and it was found that the water vapor barrier property was low.
- the base layer 312 is made of an inorganic material having a maximum pore diameter of 1.0 nm or less, whereby the base layer 312 has a maximum pore diameter larger than 1.0 nm. Compared with the case where an inorganic material is used, the water vapor transmission rate is significantly reduced, and a laminate having high water vapor barrier properties can be obtained.
- the laminated body of the present invention and the production method thereof, and the gas barrier film and the production method thereof include, for example, electronic components such as electroluminescence elements (EL elements), liquid crystal displays, and semiconductor wafers, packaging films for pharmaceuticals, foods, etc. It can be applied to film for packaging parts. Further, the present invention is applicable to a method for producing a gas barrier film including a base material formed from a polymer material, and an organic light emitting device including the gas barrier film.
- EL elements electroluminescence elements
- liquid crystal displays liquid crystal displays
- semiconductor wafers packaging films for pharmaceuticals, foods, etc. It can be applied to film for packaging parts.
- the present invention is applicable to a method for producing a gas barrier film including a base material formed from a polymer material, and an organic light emitting device including the gas barrier film.
- the present invention also includes a substrate comprising an organic polymer, a base layer disposed on the outer surface of the substrate, a laminate having an atomic layer deposition film disposed on the outer surface of the base layer, a method for producing the same, and It can be applied to a gas barrier film and a manufacturing method thereof.
- the laminate of the present invention can be used for electronic components such as electroluminescence elements (EL elements), liquid crystal displays, and semiconductor wafers.
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Abstract
Description
本願は、2015年12月28日に日本に出願された特願2015-256602号及び特願2015-256826号、及び2016年1月5日に日本に出願された特願2016-000438号に基づき優先権を主張し、その内容をここに援用する。
プラズマ反応を用いるCVD法を、PECVD(Plasma Enhanced CVD)法という。また、触媒反応を利用するCVD法を、Cat-CVD法という。
近年、成膜方法として、原子層堆積法(ALD(Atomic Layer Deposition)法。以下、「ALD法」という。)が注目されている。
ALD法は、表面吸着した物質を表面における化学反応によって原子レベルで一層ずつ成膜していく方法である。ALD法は、CVD法の範疇に分類されている。
始めに、いわゆるセルフ・リミッティング効果を利用し、基材上に前駆体が一層のみ吸着したところで未反応の前駆体を排気する。セルフ・リミッティング効果とは、基材上の表面吸着において、表面がある種のガスで覆われると、それ以上、このガスの吸着が生じない現象のことをいう。
次いで、チャンバー内に反応性ガスを導入して、先の前駆体を酸化または還元させて所望の組成を有する薄膜を一層のみ形成する。その後に反応性ガスを排気する。
ALD法では、上記第1及び第2のステップを1サイクルとし、このサイクルを繰り返し行うことで、基材上に薄膜を成長させる。
したがって、ALD法では、二次元的に薄膜が成長する。また、ALD法は、従来の真空蒸着法やスパッタリング法等との比較では、もちろんのこと、一般的なCVD法と比較しても、成膜欠陥が少ないことが特徴である。
このため、食品及び医薬品等の包装分野や電子部品分野等の幅広い分野への応用が期待されている。
通常、ガスバリアフィルムは基材の少なくとも片方の面に、ガスバリア機能を有する金属もしくは金属酸化膜が形成される。
例えば、特許文献1のようなガスバリアフィルムは基材の少なくとも片方の面に、バリア機能を有する金属もしくは金属酸化膜が形成される。しかしながら、基材が高分子フィルムであると、半導体分野で用いられているシリコンウェハやフォトマスクと比較し、表面により大きな凹凸があり、かつ自由体積などのナノレベルの空間を有する。このため、金属もしくは金属酸化物の安定した形成(膜質や密着性の維持)が困難となる。
このため、基材として高分子フィルムを用いたガスバリアフィルムが使用される製品は、高熱、高湿度等の環境的ストレスに暴露されると、金属含有膜が劣化したり、基材と金属含有膜との間の密着性が低下したりする。この結果、積層体が所望のガスバリア機能を維持することができないことがある。
特許文献5には、基材と、基材の上に形成されたポリシラザン化合物を含む第1のガスバリア層上に原子層堆積法により第2のガスバリア層を形成することで高温高湿条件下での保存安定性を向上させる技術が開示されている。
また、特許文献6には、光透過性のあるプラスチック基板の上に発光ポリマーを搭載し、その発光ポリマーの表面および側面にALD法によって原子層蒸着を行う(トップコーティングを行う)ことで、コーティング欠陥を減らすことが可能となるとともに、数十ナノメートルの厚さにおいて桁違いで気体透過を低減させることが可能なことが開示されている。
Siウェハの表面を酸化処理したものを基材とし、その基材上にALD法により原子層堆積膜を形成する場合、基材の表面には原子層堆積膜の原料となる前駆体の吸着サイトが高密度で存在するため、二次元の成長モードで原子層堆積膜の成長が進行する。
さらに、有機高分子からなる基材の状態、ALDのプロセス条件によっては、原子層堆積膜が連続膜にならない可能性が高い。
つまり、有機高分子からなる基材上に、ALD法により原子層堆積膜を形成すると、原子層堆積膜が理想的なガスバリア性を有していない恐れがあった。
特許文献7には、有機高分子からなる基材上(基材の外面)に、無機材料からなる下地層を形成し、その下地層の表面に原子層堆積膜を形成することが開示されている。
特許文献5に開示された技術では、ポリシラザン化合物を真空紫外光の照射や加水分解反応することにより無機ポリマーを下地層として形成し、下地層上に原子層堆積膜を形成する方法をとっている。しかし、ポリマー層上に原子層堆積膜が形成されているため、ガスバリア機能の発現が遅く、かつ信頼性の確保が困難である。更に、最外層に原子層堆積膜が配置されているため、高温高湿環境下への直接暴露や機械的ストレスにより、ガスバリア機能を発揮する原子層堆積膜が劣化、損傷してしまい、信頼性を確保することが困難となる。
特に、原子層堆積膜の厚さが薄い場合には、十分なガスバリア性を確保できないという問題があった。
本発明は、信頼性およびガスバリア性を向上させることができるガスバリアフィルム及びその製造方法を提供することを目的とする。
本発明の上記各態様に係るガスバリアフィルムおよびその製造方法によれば、本発明の積層体およびその製造方法を用いる。そのため、ガスバリアフィルムの信頼性およびガスバリア性を向上させることができるという効果を奏する。
本発明の第1実施形態に係る積層体について説明する。
図1は、本発明の第1実施形態に係る積層体の構成例を模式的に示す断面図である。
図1は、模式図のため、図示される各部の大きさや厚さや寸法等は、実際の積層体の寸法関係を正確に表しているわけではない(以下の図面も同様)。
基材11を構成する高分子材料の種類は、特に制限されない。基材11は、可撓性を有しない板状でもよいし、可撓性を有するフィルム状でもよい。
積層体10をガスバリアフィルムとして用いる場合には、基材11としては、フィルム状の基材(以下、フィルム状基材という)を用いるとよい。この場合、基材11(フィルム状基材)の厚さは、例えば、12μm以上300μm以下の範囲が好ましく、12μm以上100μm以下の範囲がより好ましい。
基材11の厚さが12μm未満であると、ハンドリング性が低下し、折れ、シワなどが発生しやすくなる。一方、基材11の厚さが300μmを超えると、基材11を構成する材料が多くなるためコストが高くなる。
第1の無機物質の吸着部位は、非共有電子対または不対電子を有する原子を含み、後述する前駆体と配位結合や、分子間力(ファンデルワールス力)による結合、水素結合等の相互作用をする化学構造を有すればよい。
アンダーコート層12は、第1の無機物質を含むことにより、原子層堆積膜の成膜原料である前駆体が化学吸着可能な吸着部位を、厚さ方向において基材11の外面11aと反対側の表面である外面12aに有する。
アンダーコート層12に含まれる第1の無機物質は、例えば、第III族元素、第IV族元素、第V族元素、及びランタノイド元素のうち、少なくとも1つの元素を含有してもよい。
第1の無機物質としては、金属酸化物、金属窒化物、金属硫化物、金属酸窒化物が使用されてもよい。さらに第1の無機物質としては、これらの混合膜や金属元素を複数含有した3元系以上の化合物であってもよい。
第1の無機物質は、第II族元素、遷移金属元素を含有してもよい。さらには、第1の無機物質は、表面にOH基などの原子層堆積膜の成膜原料である前駆体が化学吸着可能な吸着部位が存在してもよい。また、アンダーコート層12の主成分が金属膜であってもよい。
同じく金属窒化物としては、例えば、SiNyや、TiNy、AlNyなどを挙げることができる。
同じく3元系の酸化物としては、例えば、AlSixOyなどを挙げることができる。
さらに、第1の無機物質としては、例えば、BaTiO3や、SrTiO3等の半導体デバイスで使用するゲート絶縁膜や、メモリ素子の材料として用いられる組成、一般的にリーク電流が少ない材料として用いられる組成が用いられてもよい。
アンダーコート層12は、CVD法、PVD法、あるいはゾルゲル法を用いて形成されるため、高分子材料から形成される基材11のように、表面に自由体積空間を有していても、緻密かつ平滑な層状部を形成することができる。
アンダーコート層12の厚さが1nm未満の場合、アンダーコート層12が島状成長段階にとどまりやすく膜として成長しなくなる可能性がある。アンダーコート層12が島状成長段階にとどまる場合、後述する原子層堆積膜が早期に二次元的に成長可能な下地が形成できなくなってしまう。
アンダーコート層12の厚さが1000nmを超える場合、成膜時間がかかりすぎ、コストも増大してしまう。アンダーコート層12が基材11から屈曲や熱による膨張などのストレスを受けると、クラックなどの欠陥が生じやすくなる可能性がある。
アンダーコート層12の厚さが1nm以上であると、基材11の外面11aにおける後述の自由体積をより確実に覆うことができる。そのため、原子層堆積膜が二次元的に成長可能な下地が形成されやすくなり、後述する原子層堆積膜のガスバリア機能がより良好となる。
さらに、アンダーコート層12自体の強度およびガスバリア性がより高くなる。そのため、積層体10としてのガスバリア機能を向上することができる。
アンダーコート層12の厚さが200nm以下であるとアンダーコート層12を形成するに要する時間やコストを低減できる。つまり、アンダーコート層12の厚さを3nm以上200nm以下に形成することで、後述するように原子層堆積膜を早期に二次元的な成長をさせる下地を確保しつつ、短時間、低コストでアンダーコート層12を形成できる。
前駆体に用いる有機金属化合物としては、例えば、トリメチルアルミニウム(TMA(Tri-Methyl Aluminum))や,四塩化チタン(TiCl4),トリスジメチルアミノシラン(3DMAS),ビスジエチルアミノシラン(BDEAS),ペンタキスジメチルアミノタンタル(PDMAT)等が用いられてもよい。
第2の無機物質としては、例えば、第III族元素、第IV族元素、第V族元素、及びランタノイド元素のうち、少なくとも1つの元素を含む物質を用いてもよい。
第2の無機物質として、第III族元素、第IV族元素、第V族元素、及びランタノイド元素のうち、少なくとも1つの元素を含む無機物質の原子層堆積膜を形成することにより、他の成膜方法と比較しより高いガスバリア機能を得ることができる。
また、第2の無機物質が含む元素としては、ガスバリア機能が得られるならば上記元素には限定されない。例えば、遷移元素や典型元素など、基材上に形成可能な組成ならばどのような元素を含んでもよい。
上記無機酸化物の組成例としては、例えば、SiOX(1≦X≦2)や、AlOX(但し、Xは1≦X≦1.5)、TiOX(但し、Xは1.5≦X≦2)などが挙げられる。
機能層13の厚さが0.5nm未満の場合、例えば、ガスバリア性等の機能を発現することができないおそれがある。
機能層13の厚さが200nmを超える場合、機能層13の成膜に要するコスト及び成膜時間がかかりすぎるおそれがある。また、膜の内部応力により割れなどが生じやすくなる。
機能層13の厚さを0.5nm以上200nm以下とすると、良好なガスバリア性を有する機能層13を安価に製造することができる。
オーバーコート層14は、機能層13の外面13aを覆うことによって、環境ストレス、特に高温高湿度環境から、機能層13を保護することができる。
さらに、オーバーコート層14は、機能層13およびアンダーコート層12を覆うように形成されているため、機械的ストレスから機能層13およびアンダーコート層12を保護することができる。
第3の無機物質としては、機能層13に含まれる第2の無機物質と同等もしくはそれ以上の環境ストレス耐性および機械的ストレス耐性をもつ材料を用いる。
第3の無機物質としては、例えば、第1の無機物質として例示された無機物質はすべて使用できる。ただし、オーバーコート層14に用いる第3の無機物質と、アンダーコート層12に用いる第1の無機物質とは同じでもよいし、異なっていてもよい。オーバーコート層14全体の組成は、アンダーコート層12全体と同組成であってもよいし、異なる組成であってもよい。
オーバーコート層14は、アンダーコート層12と同様に化学気層成長法あるいは物理気層成長法を用いて形成することができる。
さらに、機能層13上に第3の無機物質であるオーバーコート層14を形成することで、積層体10のガスバリア機能がさらに向上することができる。
例えば、第3の無機物質が、上述のような金属酸化物、金属窒化物、金属酸窒化物の場合、3nm以上2000nm以下の範囲内で適宜設定することができる。
オーバーコート層14の厚さが3nm未満の場合、環境ストレスからの保護機能が低下する可能性がある。
オーバーコート層14の厚さが2000nmを超える場合、オーバーコート層14が基材11から屈曲や熱による膨張などのストレスを受けると、クラックなどの欠陥が生じやすくなる可能性がある。
オーバーコート層の厚さが5nm以上であれば環境ストレスからの保護効果がより良好になる。オーバーコート層の厚さが300nm以下であればフィルムの屈曲や熱による膨張によるクラックなどがさらに発生しにくくなる。機械的ストレスに対する保護効果は、200nm程度の厚さ以上でより良好になる。
図2Aは、本実施形態の積層体に用いる基板の模式的な断面図である。図2Bは、図2AにおけるA部の拡大図である。図3Aは、基板上にアンダーコート層を介すことなく機能層を形成する場合の原子堆積膜の一層目の様子を模式的に示す断面図である。図3Bは、図3AにおけるB部の拡大図である。
現在、ALD法によって形成された原子層堆積膜を備えた積層体は、薄膜無線EL、ディスプレイ、半導体メモリ(DRAM(Dynamic Random Access Memory))、基板としてガラス基板やシリコン基板等の電子部品用基板として、生産が行われている。
しかし、積層体10の基材11のように、高分子材料から形成される基材に好適なALD法のプロセスの研究はあまり進んでないのが実情である。
つまり、高分子材料から形成される基材の外面へのALD法を用いた原子層堆積膜の初期成長段階では、ALD法による本来の二次元成長ができず、バリア機能の発現が遅れていると考えられる。
本発明者らは、種々の検討、実験を行うことによって、基材上に無機物質から形成されるアンダーコート層を形成することで、原子層堆積膜が早期に二次元成長し、ガスバリア機能が向上し、更には環境ストレスによる耐久性が向上することも見出した。つまり、原子層堆積膜が成長する表面に無機物質を用いることで、高分子材料の表面に直接原子層堆積膜を形成する場合とは、成長様式が異なることを見出した。
一方、高分子材料から形成される基材には、結晶領域(結晶部)および非晶質領域(非晶部)が存在する。この非晶質領域には、自由体積(フリーボリューム)と呼ばれる空隙が存在する。この空隙が存在するため、例えば、水蒸気透過率の測定をした際に水分子が空隙を通過し基材を透過する。
また、原子層堆積膜においては、水分子と同様に前駆体(成膜原料)が自由体積における空隙よりも小さい分子サイズの場合、ある程度の深度で基材内に拡散することが確認されている。
さらに、原子層堆積膜の上面に無機物質層を一層形成することによって、原子層堆積膜に直接擦れや押し付けなどの機械的ストレスに対する耐性が増大する。そのため、積層体に機械的ストレスが与えられた場合により著しくなるガスバリア機能の低下を抑制できる。
例えば、高分子材料から形成される基材の場合、例えばPET、PEN(ポリエチレンテレフタレート)、PIなどのように前駆体が化学吸着可能なOH基、COOH基、COR基またはNHx基を有する。しかし、高分子材料の表面には自由体積が存在し、自由体積に前駆体が浸透してしまうため、原子層堆積膜の二次元的な成長が阻害されると考えられる。
この基材11に対して、図3A及び図3Bに示すように、外面11aに原子層堆積膜24を直接的に形成する。外面11aの自由体積の空隙21は原子層堆積膜24の成膜原料である前駆体22の分子サイズよりも大きい空間を有する。このため、自由体積中に前駆体22が拡散し、化学吸着することで、原子層堆積膜24の三次元的な成長がおこる。
すなわち、空隙21に存在する吸着部位に前駆体22が3次元的に吸着し、隔離した状態で配置される。このように、吸着サイトが隔離した状態で配置されている場合、原子層堆積膜の成長は、吸着サイトを核として三次元成長することになる。
このため、ALD法の特徴である原子層が二次元的に成長した緻密膜が形成されるためには、初期成長段階の三次元的な凹凸を埋めるまでに、ある程度の膜厚が必要になる。
したがって、薄い膜厚では初期成長段階にとどまるため膜の緻密性が確保できなくなる。この結果、ガスバリア機能の初期性能が低下したり、ガスバリア機能の信頼性が低下したりする。
これらの問題を解決するためには、緻密な原子体積膜が形成されるまで成膜を続ける必要があるため、製造に多大な時間を要する。
無機物質の表面には、自由体積が存在しないため、隣り合う核同士が接触して連続膜となり、二次元的成長モード(二次元的に薄膜が成長する段階)となることでより緻密な膜となる。
図4は、本実施形態の積層体製造方法を説明するためのフローチャートである。
図5Aは、本実施形態の積層体の製造方法における機能層形成工程における模式的な断面図である。図5Bは、図5AにおけるD部の拡大図である。
ステップS1は基材準備工程である。
本工程では、適宜の高分子材料から形成される基材11が、例えば、板状、フィルム状などの形状に形成された後、図示略の真空チャンバーに配置される。
基材11は、図示しない真空チャンバー内のステージに固定されてもよいし、基材11が巻かれたロール(原反)から巻き出されて、巻き取り軸に固定されていてもよい。
図2Bに示すように、基材11の外面11aのうち、非結晶領域には、高分子鎖が存在していない自由体積部分、つまり空隙21が存在している。
本工程では、基材11の外面11a上に、アンダーコート層12を形成する。
具体的には、図5に示すように、図示しない真空チャンバー内に配置された基材11の外面11aに、例えば、PVD法またはCVD法によって上述した第1の無機物質を含むアンダーコート層12を形成する。
PVD法としては、例えば、誘導加熱法や、抵抗加熱法、電子ビーム法、スパッタリング法等の方法を用いることができる。
CVD法としては、例えば、熱CVD法や、プラズマCVD法、光CVD法等の方法を用いることができる。
なお、アンダーコート層12は、ゾルゲル法により形成されてもよい。
ステップS3からS7は、上述した機能層13を形成する機能層形成工程Eを構成している。本工程は、ALD法によって行われる。
図5に示すように、ステップS2が終了した基材11は、例えば、原子層堆積膜成膜装置(図示略。以下同じ。)の真空チャンバー(図示略。以下同じ。)内のステージ(図示略。以下同じ。)上に、外面12aが上側の面となるように配置されている。
本ステップでは、まず、真空チャンバー内に、反応ガス兼放電ガス(例えば、O2、N2のうちの、少なくとも一方のガス)を導入する。これにより、アンダーコート層12の外面12aに反応ガス兼放電ガスを供給する。このときの真空チャンバー内の圧力は、例えば、10Pa~50Paの範囲内で適宜設定することができる。
外面12aに前駆体23が供給されて、前駆体23が吸着部位に吸着したら、ステップS3が終了し、ステップS4へと進む。
具体的には、例えば、真空チャンバーからの排気を行う真空ポンプ(図示略。以下同じ。)によって、吸着部位と結合していない前駆体23を真空チャンバーの外へ排出する。
あるいは、例えば、真空ポンプを用いて、真空チャンバーから排気しながら、不活性ガス(例えば、ヘリウムや、ネオン、アルゴン等の希ガス類元素や、窒素等。)を供給することによって、前駆体23が真空チャンバーの外へ排出されてもよい。
吸着部位と結合していない前駆体23が真空チャンバーの外へ排出されたら、ステップS5へと進む。
ステップS5において、第1及び第2のステップの実施回数が所定の回数n以上になったと判定された場合(YES)と、ステップS6へと進む。
ステップS5において、第1及び第2のステップの実施回数が所定の回数n未満と判定された場合(NO)、ステップS3へと戻り、ステップS3及びS4の処理が再度行われる。上記所定の回数nは、例えば、15回とすることができる。
図4に示す第3のステップFは、第1のステップ(ステップS3)と、第2のステップ(ステップS4)と、を所定の回数繰り返し行うステップである。
具体的には、例えば、真空チャンバー内に、反応ガス(例えば、O2、N2、CO2、H2、またはこれらのガスのうち2種以上のガスを混合させた混合ガス)を供給する。このとき、真空チャンバー内の圧力は、例えば、10Pa~50Paの範囲内の所定の圧力とすることができる。
反応ガスの供給後、真空チャンバー内において、ICP(Inductively Coupled Plasma)モードでプラズマ放電を行うことによって、プラズマを発生させる。本ステップで使用するプラズマガス励起用電源としては、例えば、13.56MHzの電源を用いることができる。
このプラズマと前駆体23とが反応することによって、一原子層の厚さを有する原子層堆積膜24が形成される。
機能層13の厚さは、予め確認されている成長速度と、サイクル数との積によって算出される。
ステップS7において、成膜した原子層堆積膜24の合計の厚さが機能層13の厚さT(目標厚さ)に到達したと判定(YESと判定)された場合、機能層形成工程Eの処理が完了し、ステップS8へと進む。
ステップS7において、成膜した原子層堆積膜24の合計の厚さが機能層13の厚さTに到達していないと判定(NOと判定)された場合、ステップS3へと戻り、ステップS3からS6を上記と同様に繰り返す。
このサイクル数は、例えば、2回以上1000回以下としてもよく、2回以上200回以下であるとより好ましい。
また、予め設定した目標とする機能層13の厚さTは、例えば、20nm以下にしてもよい。
このように、機能層形成工程Eにおいて、厚さTが20nm以下となるように、機能層13を形成することによって、例えば、ガスバリア機能などの機能層13の機能を発現しつつ、コスト、生産性、信頼性を確保することが可能となる。
本ステップでは、原子層堆積膜形成装置の真空チャンバー内から、図5Aに示すように、厚さT(二点鎖線参照)の原子層堆積膜24が形成された構造体25を取り出す。それから、オーバーコート層形成装置(図示略。以下同じ。)の成膜チャンバー(図示略。以下同じ。)内のステージ(図示略。以下同じ。)上に、構造体25を固定する。
このとき、機能層13の外面13aが上側となるように、構造体25を固定する。
この後、PVD法またはCVD法により、機能層13の外面13aを覆うように、第3の無機物質を含有するオーバーコート層14を形成する。
オーバーコート層14が、機能層13に含まれる第2の無機物質の組成と同等もしくはそれ以上の環境ストレス耐性をもつ組成を有する第3の無機物質を含むことによって、環境ストレスにより劣化してしまう機能層13を保護することが可能となる。このため、オーバーコート層14が形成されることによって、積層体10自身の信頼性を向上することができる。
ただし、積層体10がガスバリアフィルムの場合、基材11はフィルム状基材が用いられる。
さらに、積層体10がガスバリアフィルムの場合、積層体10のみで構成されてもよいが、例えば、接着剤などを介して、積層体10が他基材にラミネートされた構成であってもよい。さらに、積層体10を含むガスバリアフィルムには、有機発光素子が形成されていてもよい。
積層体10を含むガスバリアフィルムは、例えば酸素や水蒸気などの遮蔽すべき気体(ガス)から内容物を保護することができる。そのため、食品包装分野や、医薬、電子部品、農業資材など様々な分野で使用されてもよい。
積層体10の水蒸気透過率が0.5g/m2/dayよりも大きいと、酸素や水蒸気の遮蔽効果が小さいため、例えば、ガスバリアフィルムによって内容物を包装する場合に、内容物が化学的に変質しやすくなってしまう。
積層体10の水蒸気透過率を0.5g/m2/day以下にすることで、ガスバリアフィルムによる内容物の保護(内容物そのものの機能の維持)が可能となる。
積層体10を含むガスバリアフィルムによれば、信頼性およびガスバリア性を向上させることができる。
このように、原子層堆積膜24が緻密に形成されることによって、原子層堆積膜24が積層された機能層13は、薄い膜であってもガスバリア性が良好になる。
また、原子層堆積膜がより緻密に形成される。このため、原子層堆積膜が化学的に安定となり、さらにはアンダーコート層と原子層堆積膜である機能層との密着性が確保される。このため、環境ストレスによる機能の低下を抑制することが可能となる。
積層体10は、機能層13がオーバーコート層14によって覆われるため、オーバーコート層14を有しない場合に比べて、環境ストレス、あるいは機械的ストレスに対する耐性が向上する。
このため、基材11が高分子材料であって外面11aに自由体積を有していても、外面12a上には自由体積が存在しない。このため、原子層堆積膜24が隣り合う核同士が接触して連続膜となる。この結果、原子層堆積膜24においては、初期成長段階から二次元的成長モード二次元的に薄膜が成長する。このため、製造段階の早期において、原子層堆積膜24が緻密な膜となり、短時間で、高いガスバリア機能を有する膜形成が可能となる。
しかし、第1から第4のステップは、1回だけ行うようにしてもよい。すなわち、原子層堆積膜24は、一原子層のみで形成されてもよい。
図6は、本発明の第2実施形態に係る有機発光素子を模式的に示す断面図である。本実施形態の有機発光素子210は、図6に示すように、ガスバリアフィルム220と、第一の電極213と、発光層214と、第二の電極215と、封止キャップ216とを有する。
更には機能層223の厚さが20nm以下となるように形成するするとよい。機能層223の厚さが20nmよりも厚いと、コストが高く、生産性が悪くなる。なお、機能層223の厚さは、例えば、0.5nm以上がより好ましい。機能層223の厚さが0.5nmよりも薄いと機能層223のバリア機能が発現しにくくなる。
図8は、本発明の第3実施形態に係る積層体を模式的に示す断面図である。なお、本実施形態では、積層体310を構成する基材311として、フィルム状基材を用いた場合を例に挙げて以下の説明を行う。
その結果、積層体310の厚さ方向にガスが通過するような隙間が、原子層堆積膜313に生じ難くなるため、ガスバリア性の高い原子層堆積膜313を実現することができる。
つまり、大きな空孔を有する無機材料からなる下地層の外面に、ALD法により原子層堆積膜を形成すると、原子層堆積膜の形成処理開始時から二次元的な成長による緻密な膜が形成されるまでの期間が長くなる。
このため、原子層堆積膜の厚さを薄くすると、原子層堆積膜の二次元的な成長が緻密な部分が非常に少なくなる。
このようにして、有機高分子からなる基材の外面(表面)に空孔直径の小さい無機材料からなる下地層を設けることにより、前駆体を含むガスが下地層の内部に拡散することができなくなる。
図8を参照するに、本実施形態の積層体310は、基材311と、下地層312と、原子層堆積膜313と、を有する。
基材311は、有機高分子から構成されている。基材311は、下地層312が形成される外面311aを有する。
下地層(アンダーコート層)312は、基材311の外面311aの少なくとも一部に配置されている。下地層312は、空孔直径の小さな無機材料から構成されており、原子層堆積膜313が形成される外面312aを有する。
つまり、下地層312の外面312a(表面)には、特許文献7に開示された下地層の外面(表面)と比較して、前駆体が下地層312の内部まで拡散する空孔が少ないか、もしくは、存在しない。
最大空孔直径が1.0nmを超えると、ALD法に用いられる多くの前駆体の分子サイズと比較して、空孔直径が大きくなる。そのため、高いガスバリア性を得るためには、前駆体が下地層312に拡散し、下地層312の空孔を塞ぐまでに原子層堆積膜313の膜厚を厚くすること(例えば、3nm以上)が必要となるため、好ましくない。
下地層312の厚さが1.0nm未満であると、吸着サイトの密度が不十分であるため、十分な水蒸気バリア性を有する原子層堆積膜313を形成することができない。一方、下地層312の厚さが1000nmを超えると、多くの材料および成膜時間を要し、さらに、下地層312に割れや欠陥が生じるため好ましくない。
このように、基材311と下地層312との間に密着層を配置させることにより、基材311と下地層312との密着強度を向上させることができる。
原子層堆積膜(機能層)313は、下地層312の外面312aの少なくとも一部に配置されている。
原子層堆積膜313は、原子層堆積膜313の成膜原料となる前駆体(例えば、TMA:Tri-Methyl AluminumやTiCl4などの金属含有前駆体)を含有するとともに、下地層312の外面312aに位置する前駆体と無機物質の吸着サイトとが結合されている。
原子層堆積膜313の厚さが0.5nm未満であると、製造技術の観点から十分な水蒸気バリア性を有する原子層堆積膜313を形成することができない。一方、原子層堆積膜313の厚さが200nmを超えると、多くの材料および長い成膜時間を要するため好ましくない。
したがって、原子層堆積膜313の厚さを0.5nm以上200nm以下の範囲内とすることで、短時間で、かつ十分な水蒸気バリア性を有する原子層堆積膜313を得ることができる。
次に、図8を参照して、本実施形態の積層体310の製造方法について説明する。
始めに、有機高分子から形成される基材311の外面311aの少なくとも一部に、下地層312を形成する(下地層形成工程)。
下地層312は、例えば、PVD法(例えば、誘導加熱法、抵抗加熱法、電子ビーム蒸着法、スパッタリング法など)や、CVD法(例えば、熱CVD法、プラズマCVD法、光CVD法など)の方法により形成することができる。
始めに、真空チャンバー(図示せず)内のステージに、下地層312が形成されていない基材311を固定する。
次いで、上記真空チャンバー内の圧力(成膜前圧力)を、例えば、2×10-3Paにする。このとき、真空チャンバー内の温度は、例えば、30℃とすることができる。
次いで、電子ビームを蒸着材料に照射し、真空チャンバー内の圧力(成膜中圧力)が、例えば、1×10-2Paになった後、基材311の外面311aの少なくとも一部に、電子ビーム蒸着法を用いてSiOx(Xは1.0以上2.0以下)を含む下地層312を形成する。
これにより、最大空孔直径が1.0nm以下の下地層312を形成することができる。
例えば、密着層は、ワイヤーバーを用いて、基材311の外面311aに塗工液(密着層の母材となる液)を塗布し、その後、その塗工液を乾燥させることで形成される。
上記塗工液は、例えば、ポリ(メタクリル酸-2-ヒドロキシエチル)とポリメタクリル酸メチルとの共重合体で、かつポリ(メタクリル酸-2-ヒドロキシエチル)が共重合体中で35モル%の割合で含まれている有機高分子を、メチルエチルケトンとシクロヘキサノンとの混合溶液に溶解させることで調製される。
上記密着層は、本発明の必須の構成ではなく、必要に応じて設ければよい。
つまり、原子層堆積膜形成工程では、原子層堆積法(ALD法)を用いて、原子層堆積膜313を形成することが好ましい。これにより、積層体310が製造される。
始めに、原子層堆積膜形成装置(図示せず)の成膜チャンバー(図示せず)内のステージ(図示せず)上に、下地層312が形成された基材311を固定する。
このときの上記成膜チャンバー内の圧力は、例えば、10Pa~50Paの範囲内で適宜設定することができる。
また、プラズマガス励起用電源としては、例えば、13.56MHzの電源を用いることができる。
このときのプラズマ放電の出力電力を、例えば、250Wattとすることができる。
ガスパージを行う際に使用するガスとしては、例えば、O2やN2などを用いることができる。
また、上記ガスパージ時の反応温度を、例えば、90℃とすることができる。
次いで、上記成膜チャンバー内に、パージガス(例えば、ArおよびN2)のみを供給する(ステップ5)。
このとき、上記成膜チャンバー内の圧力は、例えば、10Pa以上50Pa以下の範囲内の所定の圧力とすることができる。その後、上記成膜チャンバー内において、ICP(Inductively Coupled Plasma)モードでプラズマ放電を行い(ステップ6)、下地層312の外面312aに、一原子層のAl2O3膜(原子層堆積膜313の一部)を形成する。このときに使用するプラズマガス励起用電源としては、例えば、13.56MHzの電源を用いることができる。
次いで、上記成膜チャンバー内に、パージガス(例えば、ArおよびN2)のみを供給する(ステップ7)。
実施例1~3、および比較例1~4の各積層体の構成および評価結果について、表1に示す。ただし、表1では符号の記載は省略している。
<積層体の作製>
実施例1の積層体(以下の説明では「積層体10-1」という。表1では符号省略。)の作製方法について説明する。
基材11として、厚さ25μmのポリイミド(PI)フィルムUPILEX(登録商標)(商品名;宇部興産社製)を準備し、真空チャンバー内に配置した(基材配置工程)。
次にスパッタリング法によって、基材11の外面11aに、厚さ20nmのTa2O5膜から形成されるアンダーコート層12を形成した(アンダーコート層形成工程)。
具体的には、真空チャンバー内に収容された基材11の外面11aに、Taターゲットを用いた反応性スパッタによって厚さ20nmのTa2O5膜を形成した。
具体的には、まず、真空チャンバー内に収容された、アンダーコート層12が形成された製造途中の積層体の外面12aに、成膜原料(前駆体)であるTMAと、パージガスであるN2およびO2と、を同時に供給した(第1のステップ)。
この第1のステップにおいて、TMA、N2、及びO2を供給する時間は、1秒であった。また、このときの真空チャンバー内の温度は、90℃であった。
この第2のステップにおいて、O2及びN2を供給する時間は、10秒であった。O2及びN2の供給量は、それぞれ100sccmであった。このときの真空チャンバー内の温度は、90℃であった。
その後、上記第1のステップ及び第2のステップのサイクルを15回繰り返し行った(第3のステップ)。
このとき、プラズマガス励起用電源としては13.56MHzの電源を用いた。
具体的には、真空チャンバー内に収容された構造体25における機能層13の外面13aに、Taターゲットを用いて反応性スパッタを行うことによって、厚さ20nmのTa2O5膜を形成した。
これにより、表1に示されるような実施例1の積層体10-1が製造された。
実施例2の積層体(以下の説明では「積層体10-2」という。表1では符号省略。)は、表1に示すように、機能層13の材質がAlSixOyに代えられたこと以外は、上記積層体10-1と同様の構成を有する。積層体10-2は、機能層形成工程を除いて、上記積層体10-1の製造方法と同様にして製造された。
具体的には、機能層形成工程において、前駆体23としてトリメチルアルミニウムとトリスジメチルアミノシランとを交互に堆積させることによって、機能層13として、厚さ10nmのAlSixOy膜を形成した。
実施例3の積層体(以下の説明では「積層体10-3」という。表1では符号省略。)は、表1に示すように、オーバーコート層14の厚さが300nmであること以外は、上記積層体10-1と同様の構成を有する。積層体10-3は、オーバーコート層形成工程における成膜量を除いて、上記積層体10-1の製造方法と同様にして製造された。
実施例1と同様の方法で積層体(ガスバリアフィルム)を得た。
この積層体(ガスバリアフィルム)上に第一の電極層、発光層、及び第二の電極層を形成し、封止キャップを形成することで、図6に示す積層構造を有する有機発光素子210を形成した。
実施例2と同様の方法で積層体(ガスバリアフィルム)を得た。この積層体(ガスバリアフィルム)上に実施例4と同様に第一の電極層、発光層、及び第二の電極層を形成し、封止キャップを形成することで、図6に示す積層構造を有する有機発光素子210を形成した。
図8を参照して、実施例6の積層体の作製方法について説明する。
始めに、厚さ100μmのポリエチレンテレフタレート(PET)フィルム(東洋紡株式会社製のA4100(型番))からなる基材311の外面311aに、ワイヤーバーを用いて、塗工液を塗布し、乾燥後の膜厚が0.1μmの密着層(図示せず)を形成した。
具体的には、下記方法により、厚さ0.6nmのAl2O3膜を形成した。
始めに、成膜チャンバー内の圧力(成膜前圧力)を0.5Paとした後に、成膜チャンバー内に収容された下地層312の外面312aに、反応ガス兼放電ガスとしてO2を供給した(ステップ1)。
次いで、プラズマ放電後に、成膜チャンバー内をガスパージした(ステップ2)。ガスパージでは、パージガスとしてO2およびN2を10秒供給した。なお、このときの反応温度を90℃とした。
このようにして、実施例6の積層体を作製した。
図8を参照して、実施例7の積層体の作製方法について説明する。
実施例7では、実施例7の積層体を構成する原子層堆積膜313の厚さを10nmに変更したこと以外は、実施例6の積層体と同様な手法により、実施例7の積層体を作製した。
比較例1の積層体(以下の説明では「積層体E-1」という。表1では符号省略。)は、表1に示すように、アンダーコート層12およびオーバーコート層14を有しないこと以外は、上記積層体10-1と同様の構成を有する。積層体E-1においては、機能層13が基材11の外面11aに直接形成されており、最外面が機能層13である。
比較例2の積層体(以下の説明では「積層体E-2」という。表1では符号省略。)は、表1に示すように、オーバーコート層14を有しないこと以外は、上記積層体10-1と同様の構成を有する。積層体E-2は、オーバーコート層形成工程を行わないことを除いて、上記積層体10-1の製造方法と同様にして製造された。
比較例3の積層体(以下の説明では「積層体E-3」という。表1では符号省略。)は、表1に示すように、オーバーコート層を有しない点以外は、上記積層体10-2と同様の構成を有する。積層体E-3は、オーバーコート層形成工程を行わないことを除いて、上記積層体10-2の製造方法と同様にして製造された。
比較例4は、上記実施例1~3、上記比較例1~3に用いた基材11の水蒸気透過率を測定するために用意された厚さ25μmのPI基材で、基材11である。したがって、比較例4は積層体ではないが、以下の説明では、便宜上、「積層体E-4」(表1では符号省略。)という。
比較例1の積層体上に実施例4と同様に第一の電極層、発光層、及び第二の電極層を形成し、封止キャップを形成することで、有機発光素子を形成した。
比較例2の積層体上に実施例4と同様に第一の電極層、発光層、及び第二の電極層を形成し、封止キャップを形成することで、有機発光素子を形成した。
比較例3の積層体上に実施例4と同様に第一の電極層、発光層、及び第二の電極層を形成し、封止キャップを形成することで、有機発光素子を形成した。
比較例8では、実施例6で行った下地層312(図8参照)を形成する工程において、成膜中の圧力のみ9×10-2Paに変更した。
次いで、下地層312の外面312aに、実施例6と同様な手法(ALD法)により、原子層堆積膜313として厚さ0.6nmのAl2O3膜を形成した。
このような方法で、比較例8の積層体を作製した。
比較例9では、実施例7で行った下地層312(図8参照)を形成する工程において、成膜中の圧力のみ9×10-2Paに変更した。
次いで、下地層312の外面312aに、実施例7と同様な手法(ALD法)により、原子層堆積膜313として厚さ10nmのAl2O3膜を形成した。
このような方法で、比較例9の積層体を作製した。
比較例10では、実施例6または7で行った原子層堆積膜313(図8参照)を形成する工程を行うことなく、厚さ100μmのポリエチレンテレフタレート(PET)フィルム(東洋紡株式会社製のA4100(型番))よりなる基材311の外面311aに下地層312として厚さ30nmのSiO1.6を形成した。
このような方法で、比較例10の積層体を作製した。
実施例1~4の積層体と、比較例1~3の積層体との評価は、耐久性試験と、機械的ストレス試験とによって行われた。
ただし、表1に示すように、耐久性試験は、実施例1、2の積層体と、比較例1~3の積層体とを用いて行われた。機械的ストレス試験は、実施例3の積層体と、比較例2の積層体とを用いて行われた。
各試験において、それぞれの試験前と試験後とにおける水蒸気透過率が比較された。
水蒸気透過率の測定は、MOCON社製の水蒸気透過率測定装置であるPERMATRAN(登録商標)もしくはMOCON社製の高感度水蒸気透過率測定装置であるAQUATRAN(登録商標)を用いて行われた。ただし、AQUATRAN(登録商標)は、PERMATRAN(登録商標)の測定下限値を下回る場合に使用された。
PERMATRAN(登録商標)の測定下限値は0.02(g/m2/day)である。AQUQTRAN(登録商標)の測定下限値は5.0×10-4(g/m2/day)である。
いずれの水蒸気透過率の測定も、温度が40度、かつ湿度が90%RHに調整されたN2ガスを用いて行われた。
なお、積層体をガスバリアフィルムとして用いるためには、水蒸気透過率は、例えば、0.5(g/m2/day)以下であることが好ましい。
各試験前における各積層体の水蒸気透過率は、表1に示すように、実施例1~3の積層体10-1~10-3の水蒸気透過率は、いずれもAQUQTRAN(登録商標)の測定下限値の5.0×10-4(g/m2/day)以下であった(表1では、「<5.0×10-4」と表記。)。比較例1の積層体E-1の水蒸気透過率は、4.1×10-4(g/m2/day)であった。比較例2、3の積層体E-2、E-3の水蒸気透過率は、5.0×10-4(g/m2/day)以下であった。
各積層体に共通して用いられた基材11(比較例4の積層体E-4)の水蒸気透過率は、1.09(g/m2/day)であった。
耐久性試験は、純水を沸騰させ水蒸気を、積層体10-1,10-2,E-1~E-3に5分間暴露させることによって行われた。
この耐久試験後の各積層体の水蒸気透過率は、表1に示すように、積層体10-1の水蒸気透過率は、1.0×10-2(g/m2/day)であった。積層体10-2の水蒸気透過率は、5.0×10-4(g/m2/day)以下であった。積層体E-1の水蒸気透過率は、1.21(g/m2/day)であった。積層体E-2の水蒸気透過率は、1.17(g/m2/day)であった。積層体E-3の水蒸気透過率は、0.07(g/m2/day)であった。
機械的ストレス試験は、積層体10-3,E-2を長尺のフィルムに貼付け、このフィルムを3インチ(7.62cm)のコアに1回巻きつけて行った。積層体がコアに巻きつけられることによって、積層体に擦れ、押し付けのストレス等の機械的ストレスが与えられた。
この機械的ストレス試験後の積層体10-3の水蒸気透過率は、1.30×10-3(g/m2/day)であった。積層体E-2の水蒸気透過率は、0.58(g/m2/day)であった。
実施例4、5、及び比較例5~7の積層体(ガスバリアフィルム)について、耐久性試験前及び耐久性試験後に水蒸気透過率WVTR(g/m2/day)を測定した。水蒸気透過率WVTRの測定は、MOCON社製の高感度水蒸気透過率測定装置であるAQUATRAN(登録商標)を用いて行った。水蒸気透過率の測定は、温度が40℃、かつ湿度が90%RHに調整されたN2ガス雰囲気下で行った。
各試験前における各積層体の水蒸気透過率は、表2に示すように、実施例4及び5の積層体(ガスバリアフィルム)10-4及び10-5の水蒸気透過率は、いずれもAQUQTRAN(登録商標)の測定下限値の5.0×10-4(g/m2/day)以下であった(表2では、「<5.0×10-4」と表記。)。比較例5の積層体E-5の水蒸気透過率は、4.1×10-4(g/m2/day)であった。比較例6、7の積層体E-6、E-7の水蒸気透過率は、5.0×10-4(g/m2/day)以下であった。
この結果を表2に示す。
実施例4、5及び比較例5~7で作製した有機発光素子を、60℃、90%RHの環境下に暴露(環境試験)し、環境試験後に、第一の電極層と第二の電極層の電圧印加部(図示せず)に10Vの電圧を印加しながら、各素子を顕微鏡にて素子の発光状態を観察した。顕微鏡により発光面積を測定し、評価面積に対する発光面積の比率を算出して発光領域の面積率とした。
次に、実施例6および7の積層体の水蒸気バリア性を評価するために、水蒸気透過率測定装置(MOCON,INC.製のMOCON Aquatran(商標登録))を用いて、40℃、90%RHの雰囲気で、実施例6および7の積層体の水蒸気透過率(WVTR)を測定した。
次に、比較例8~10の積層体の水蒸気バリア性を評価するために、水蒸気透過率測定装置(MOCON,INC.製のMOCON Permatran(商標登録))を用いて、40℃、90%RHの雰囲気で、比較例8~10の積層体の水蒸気透過率(WVTR)を測定した。
下地層312の空孔直径を評価するために、陽電子消滅法によるパルスビーム方式陽電子寿命測定装置(フジ・インバック株式会社製のPALS-1(商品名))を用いて、下地層312の最大空孔直径を評価した。なお、下地層312の最大空孔直径とは、パルスビーム方式陽電子寿命測定装置による空孔直径の測定において、直径が10nm以下とされた全ての空孔の存在確率を1としたときに、存在確率が0.0001以上の空孔のうち、空孔直径が最大のもののことである。
下地層312の空孔直径の評価には、実施例6及び7、または、比較例8及び9で行った原子層堆積膜313(図8参照)を形成する工程を行うことなく、厚さ100μmのポリエチレンテレフタレート(PET)フィルム(東洋紡株式会社製のA4100(型番))からなる基材311の外面311aに下地層312のみを形成したサンプルを用いた。この結果を表3に示す。
表1に示すように、耐久性試験後における実施例1の積層体10-1の水蒸気透過率は、オーバーコート層14を有しない比較例2の積層体E-2およびオーバーコート層14およびアンダーコート層12を有しない比較例1の積層体E-1の水蒸気透過率の約1/8であった。
積層体10-1は、上記耐久性試験が実施された後でも、積層体E-1、E-2に比べて格段に高いガスバリア性を有しており、耐久性が高いことが分かる。
これは、積層体E-1、E-2では、オーバーコート層14を有さないため、Al2O3膜が水分と反応して劣化するためである。
積層体E-1は、耐久性試験前でも、積層体10-1に比べて著しく水蒸気透過率が低いが、これは、アンダーコート層12を有しないために、Al2O3膜自体に緻密性が欠けているためであると考えられる。
この理由は、耐久性試験後における積層体E-3の水蒸気透過率は、耐久性試験後の積層体E-1の約45%になっていることを考慮すると、AlSixOy膜自体の水分に対する耐性が、Al2O3膜の耐性よりも高いからであると考えられる。
これは、オーバーコート層14によって機能層13が覆われることによって、機械的ストレスによる外力から機能層13を保護でき、機能層13の劣化を抑制できるためであると考えられる。
表3を参照するに、実施例6の積層体では、水蒸気透過率が1.0×10-2g/(m2・day)であり、非常に厚さが薄い0.6nmのAl2O3膜(原子層堆積膜313)でも1.0×10-2g/(m2・day)以下の良好な水蒸気バリア性を有することが確認できた。
一方、比較例8の積層体では、水蒸気透過率が5.4×100g/(m2・day)であり、水蒸気バリア性が低いことが分かった。
表3を参照するに、実施例7の積層体では、水蒸気透過率が2.0×10-3g/(m2・day)であり、1.0×10-2g/(m2・day)以下の良好な水蒸気バリア性を有することが確認できた。
一方、比較例9の積層体では、水蒸気透過率が7×10-2g/(m2・day)であり、水蒸気バリア性が低いことが分かった。
表3を参照するに、原子層堆積膜313が形成されていない比較例10の積層体では、水蒸気透過率が1.0×100g/(m2・day)であり、下地層312によって水蒸気バリア性を有すると考えられるが、水蒸気透過率が1.0×10-2g/(m2・day)以下の良好な水蒸気バリア性はなかった。
表3を参照するに、良好な水蒸気バリア性が確認された実施例6および7の積層体における下地層312の最大空孔直径は0.9nmであった。一方、良好な水蒸気バリア性が確認されなかった比較例8および9の積層体における下地層312の最大空孔直径は2.8nmであった。
また、本発明は前述した説明によって限定されることはなく、添付の特許請求の範囲によってのみ限定される。
また、本発明は、高分子材料から形成される基材を含むガスバリアフィルムの製造方法、並びに前記ガスバリアフィルムを含む有機発光素子に適用可能である。
11、311 基材
11a、12a、13a、22la、222a、223a、224a、311a、312a 外面
12、222 アンダーコート層(無機層)
13、223 機能層
14、224 オーバーコート層(無機層)
21 空隙
23、232 前駆体
24、225、313 原子層堆積膜
25 構造体
210 有機発光素子
221 フィルム基材
213 第一の電極層
214 発光層
215 第二の電極層
216 封止キャップ
312 下地層(アンダーコート層)
Claims (20)
- 第一面を有し、高分子材料から形成される基材と、
前記基材前記第一面上の少なくとも一部に配置され、原子層堆積膜の成膜原料である前駆体と結合可能な吸着部位を有する第1の無機物質を含むアンダーコート層と、
前記前駆体から形成される前記原子層堆積膜であり、前記アンダーコート層の外面を覆うように配置され、前記アンダーコート層の前記吸着部位と結合する第2の無機物質を含む機能層と、
前記機能層の外面を覆うように配置され、第3の無機物質を含むオーバーコート層と、
を有する、積層体。 - 前記アンダーコート層および前記オーバーコート層は、第III族元素、第IV族元素、第V族元素、及びランタノイド元素のうち、少なくとも1つの元素を含む無機層である、請求項1に記載の積層体。
- 前記アンダーコート層および前記オーバーコート層は、酸化物、窒化物、及び酸窒化物のうち少なくとも1つを含む、請求項1または2に記載の積層体。
- 前記アンダーコート層および前記オーバーコート層は、タンタル(Ta)元素を含む、請求項1ないし3のいずれか1項に記載の積層体。
- 前記アンダーコート層の厚さは、1nm以上200nm以下である、請求項1ないし4のいずれか1項に記載の積層体。
- 前記機能層の厚さは、0.5nm以上200nm以下である、請求項1ないし5のいずれか1項に記載の積層体。
- 前記オーバーコート層の厚さは、5nm以上200nm以下である、請求項1ないし6のいずれか1項に記載の積層体。
- 前記アンダーコート層の外面に位置する前記吸着部位は、酸素(O)原子または窒素(N)原子を有する、請求項1ないし7のいずれか1項に記載の積層体。
- 請求項1ないし8のいずれか1項に記載の積層体を含み、前記積層体の水蒸気透過率が0.5g/(m2・day)以下である、ガスバリアフィルム。
- 請求項1から請求項8のいずれか一項に記載の積層体、第一の電極層、発光層、および第二の電極層を含む有機発光素子。
- 前記積層体の水蒸気透過率が0.01g/(m2・day)以下であることを特徴とする、請求項10に記載の有機発光素子。
- 高分子材料から形成される基材を真空チャンバー内に配置し、
前記基材の外面の少なくとも一部に、原子層堆積膜の成膜原料である前駆体と結合可能な吸着部位を有する第1の無機物質を含むアンダーコート層を形成し、
原子層堆積法によって、前記アンダーコート層の外面を覆うように、前記吸着部位と結合した第2の無機物質を含有する機能層を前記前駆体から形成し、
前記機能層の外面を覆うように、第3の無機物質を含有するオーバーコート層を形成すること
を含む、積層体の製造方法。 - 前記機能層を形成する際に、前記アンダーコート層の外面における前記吸着部位と結合するように、前記前駆体を供給する第1のステップと、
前記第1のステップの後、前記吸着部位と結合していない前記前駆体を前記真空チャンバーの外へ排出する第2のステップと、
前記第1のステップと、前記第2のステップと、を所定の回数繰り返し行う第3のステップと、
前記第3のステップの後、前記真空チャンバー内に反応ガスを供給し、前記反応ガスに電圧を印加することでプラズマを発生させ、前記プラズマと前記前駆体とを反応させることで、一原子層の厚さを有する原子層堆積膜を形成する第4のステップと、
前記第4のステップの後、積層された前記原子層堆積膜の合計の厚さが前記機能層の所定の厚さとなるように、前記第1から第4のステップのサイクルを15回以上行う、請求項12に記載の積層体の製造方法。 - 前記アンダーコート層および前記オーバーコート層は、化学気層成長法または物理気層成長法によって形成される、請求項12または13に記載の積層体の製造方法。
- 前記アンダーコート層および前記オーバーコート層は、第III族元素、第IV族元素、第V族元素、及びランタノイド元素のうち、少なくとも1つの元素を含む無機層として形成される、請求項12ないし14のいずれか1項に記載の積層体の製造方法。
- 前記アンダーコート層は、1nm以上20nm以下の厚さに形成される、請求項12ないし15のいずれか1項に記載の積層体の製造方法。
- 前記機能層は、1nm以上200nm以下の厚さに形成される、請求項12ないし16のいずれか1項に記載の積層体の製造方法。
- 前記オーバーコート層は、5nm以上200nm以下に形成される、請求項12ないし17のいずれか1項に記載の積層体の製造方法。
- 請求項12ないし18のいずれか1項に記載の積層体の製造方法によって、水蒸気透過率を0.5g/(m2・day)以下となるように形成された前記積層体を形成する、ガスバリアフィルムの製造方法。
- 真空チャンバー内に配置された有機高分子から形成される基材の外面の少なくとも一部に、無機材料を用いて、最大空孔直径が1.0nm以下の下地層を形成し、
前記下地層の外面に成膜原料となる前駆体を供給して、前記下地層の外面の少なくとも一部において、前記前駆体と反応ガスとを反応させて原子層堆積膜を形成する積層体の製造方法。
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