WO2010024378A1 - 酸化ケイ素薄膜または酸窒化ケイ素化合物薄膜の製造方法およびこの方法で得られる薄膜 - Google Patents
酸化ケイ素薄膜または酸窒化ケイ素化合物薄膜の製造方法およびこの方法で得られる薄膜 Download PDFInfo
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- WO2010024378A1 WO2010024378A1 PCT/JP2009/065046 JP2009065046W WO2010024378A1 WO 2010024378 A1 WO2010024378 A1 WO 2010024378A1 JP 2009065046 W JP2009065046 W JP 2009065046W WO 2010024378 A1 WO2010024378 A1 WO 2010024378A1
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- H10P14/662—
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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Definitions
- the present invention relates to a method for producing a silicon oxide film or silicon oxynitride thin film containing smectite silicate by a solution process, and a thin film obtained by the process.
- an element constituent material that is formed by applying from a solution such as a printing process and that has flexibility and high impact resistance is required.
- the organic EL element is most promising in adapting to a plastic substrate because it is excellent in image quality performance among display elements and can be easily reduced in thickness.
- Various light emitting layer materials and charge transport materials that meet the above requirements have been developed today, but they have a problem that they are vulnerable to the surrounding environment such as oxygen or water. For this reason, it is necessary to install a protective film for enhancing the environmental resistance of the organic EL element.
- the protective film is also produced by a coating process.
- the produced protective film has a problem that its function cannot be sufficiently performed.
- Patent Document 1 As a typical example of a protective film for an organic EL device, there is a method in which a thin film of silicon nitride or silicon dioxide is formed on an organic EL element by a CVD method or the like (see “Patent Document 1” below). .
- Patent Document 2 As a protective film with high bending stress resistance, an inorganic material and an organic material are alternately laminated to reduce the stress of the protective film in the element. There is a proposal of a technique to be performed (see “Patent Document 2” below).
- the addition of the smectite silicate compound is mostly performed on the polymer material, but since the barrier property of the polymer material is extremely low, the effect of improving the barrier property by addition can be confirmed, but the organic EL There is a gap of about 5 digits in water vapor transmission coefficient up to the required barrier property (see “Patent Document 5” below).
- Patent Document 5 there is an example in which mica is dispersed in a metal oxide glass using a sol-gel method, but a dense film cannot be obtained due to the characteristics of the production method, and high barrier properties cannot be obtained (such as “Reference Patent 6” below).
- the present invention provides a method for efficiently producing a silicon oxide thin film or a silicon oxynitride thin film having a high water vapor / oxygen barrier property and a high impact strength by a solution process having a production advantage, and an organic EL device obtained by this method.
- An object of the present invention is to provide a thin film useful as a protective film for the electrical element.
- the inventors of the present invention contain a silicon oxide or silicon oxynitride compound with high efficiency when a silazane coating film containing a smectite silicate layered compound is irradiated with ultraviolet rays in an oxygen atmosphere.
- this thin film exhibits a high water vapor / oxygen barrier property and high strength and is extremely useful as a protective film for an electric element of, for example, an organic EL element, thereby completing the present invention. That is, according to this application, the following invention is provided.
- the smectite group silicate compound is a material represented by the following general formula.
- A represents sodium, calcium, or lithium, and indicates that they are configured as a single component or a mixture thereof.
- B is aluminum, magnesium, lithium, iron, zinc, copper.
- a silicon oxide or silicon oxynitride thin film having high water vapor / oxygen barrier properties and high strength can be efficiently produced by a solution process having a production advantage.
- a silicon oxide thin film or silicon oxynitride thin film containing a smectite group silicate compound obtained by this method is excellent in gas barrier properties against oxygen and the like, moisture permeability resistance, and impact resistance. It can be used as a protective film for electronic devices, improving the durability of the element.
- since it can be coated on plastic substrates and has high impact resistance, it has a wide range of applications and is expected to be widely used as a technology for developing film elements, large-area elements, and flexible elements. Is.
- Substrate 10
- Electronic device 30
- Silicon oxide thin film 40
- a method for producing a silicon oxide thin film or a silicon oxynitride compound thin film containing a smectite group silicate layered compound comprises applying a solution containing a smectite group silicate layer compound and silazane to the substrate surface, The film is characterized by being irradiated with ultraviolet light in an oxygen atmosphere.
- the coating film containing the silazane compound generates ammonia and oxygen by irradiation with ultraviolet light in an oxygen atmosphere or an oxygen atmosphere containing nitrogen, and is converted into a silicon oxide thin film or a silicon oxynitride thin film.
- a silicon oxynitride thin film can be obtained by irradiating the same film with ultraviolet light in a nitrogen atmosphere containing no oxygen or in a vacuum. Therefore, according to the method of the present invention, for example, an organic EL element can be produced on a flexible substrate by a coating process, and at the same time, a protective film can be produced by a coating process, and the produced protective film has a high water vapor / oxygen barrier property. Since the inorganic material has high strength and its functions are sufficiently exhibited, all the problems of the conventional organic EL device described above can be solved.
- the substrate used in the present invention is not particularly limited, and any substrate may be used.
- glass substrates such as quartz are preferably used, but polycarbonate (PC), polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethersulfone (PES), polyarylate Plastic film substrates such as (PAR) and polyetherketone (PEEK), ceramic films such as green sheets, and flexible film substrates such as metal foil films can also be used.
- a protective film such as a silicon nitride or silicon oxynitride thin film produced by, for example, CVD or sputtering.
- a silazane compound is used as the raw material in the present invention.
- This silazane compound is a compound mainly composed of a silicon atom, a nitrogen atom, and a hydrogen atom, and can be used as long as it is soluble in the solvent used.
- a silazane compound for example, commercially available polysilazane NN110, NN310, NL110, NL120, NL150, NP110, NP140, SP140, UP140 (manufactured by AZ Electronic Materials) and the like can be used.
- it may contain other elements such as oxygen atoms and carbon atoms.
- silane compounds include commercially available alkylsiloxane-based HOSP, ACCUGLASS, ACCUFLO (manufactured by Honeywell), HSG (manufactured by Hitachi Chemical), OCDT-9, OCLT (manufactured by Hitachi Chemical), LKD-T200, LKD-T400 (manufactured by JSR), ALCAP-S (manufactured by Asahi Kasei Kogyo), silica aerogel (manufactured by Kobe Steel), PolyELK (manufactured by Air Products and Chemicals, Inc.), and the like can also be used.
- a solution containing these raw material silazane compounds (hereinafter also referred to as matrix) and a smectite silicate compound is formed by a solution process, and the thin film is preferably irradiated with ultraviolet rays in an oxygen atmosphere or the like while being heated. By doing so, it can be set as the silicon oxide thin film or the silicon oxynitride thin film compound thin film containing a smectite silicate compound.
- silicon oxide thin film or silicon oxynitride compound thin film all elements of silicon atoms, oxygen atoms, hydrogen atoms, nitrogen atoms such as oxides such as SiO 2 and oxynitrides such as SiON, or the like Examples include solid thin films composed of some elements.
- the thin film obtained by the method of the present invention has a structure in which plate-like smectite silicate compounds are arranged in parallel to the film surface.
- aromatic hydrocarbons aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, halogenated hydrocarbons, halogenated aromatic hydrocarbons, ethers, amines, and the like can be used.
- the solvent is preferably purified by removing impurities such as moisture and a small amount of inorganic components.
- the smectite group layered silicate compound used in the present invention is composed of those represented by the following general formula.
- A represents sodium, calcium, or lithium, and indicates that they are configured as a single or mixed.
- B is aluminum, magnesium, lithium, iron, zinc, copper
- N is any positive rational number.
- Typical examples of these compounds include hectorite, montmorillonite, beidellite, nontronite, saponite, saconite, stevensite saponite, swinholderite, beidellite, nontronite, and bolcon score. It is not limited.
- smectite silicates modified with organic materials such as phosphates and ammonium salts, Ionite, Galleon Earth, Mizkanite, Benclay, Sylphonite, Aid Plus (made by Mizusawa Chemical Industry) and Lucentite (made by Corp Chemical)
- organic materials such as phosphates and ammonium salts, Ionite, Galleon Earth, Mizkanite, Benclay, Sylphonite, Aid Plus (made by Mizusawa Chemical Industry) and Lucentite (made by Corp Chemical)
- Commercially available synthetic smectite such as Labonite (Laporte Industries) DP-DM or DM Clean (manufactured by Topy Industries, Ltd.) can be used.
- the smectite silicate compound and the silazane compound need to be combined in the nano order, and if this is achieved, the concentration of smectite silicate is not particularly limited. Considering the combination and thixotropy as ink, 1 wt.% To 50 wt.% Is optimal. If high barrier performance can be obtained, it can be added up to 99 wt.%, But it is desirable that the concentration be as low as possible.
- the method for mixing the smectite silicate compound into the silazane compound (matrix material) is not particularly limited.
- a method suitably used a method in which the interlayer of the smectite layered silicate compound is modified with an organic material such as a quaternary amine to increase the solubility in a solvent is employed (for example, JP-A-7-187656). See the official gazette).
- Dispersion is performed by directly dissolving the silazane compound as the matrix material in the solution, or by mixing with another solution in which the matrix material is dissolved.
- a dissolution method a method such as physical stirring, dispersion by ultrasonic waves, and dissolution under heating as necessary is used.
- a solution containing the raw material silazane compound (matrix) and the smectite group silicate compound is then applied and formed on the substrate by a solution process, but this liquid phase process is not particularly limited.
- methods that are preferably used are coating methods such as spin coating, dip coating, bar coating, spray coating, blade coating, etc., but when only a specific part is applied, screen printing, gravure printing, flexographic printing, etc.
- printing methods such as letterpress printing, intaglio printing, and offset printing, ink jet methods, dispenser methods, drop cast methods, and the like can be used.
- the solvent used at this time is not particularly limited, and any solvent may be used as long as it does not damage the underlayer. It can be selected as appropriate according to the type of base.
- a silicon oxide thin film or a silicon oxynitride compound thin film containing a smectite group silicate compound is produced by irradiating the thin film obtained above with ultraviolet rays in an oxygen atmosphere.
- the coating film containing the silazane compound generates ammonia or oxygen by irradiation with ultraviolet light in an oxygen atmosphere or an oxygen atmosphere containing nitrogen, and a silicon oxide thin film or silicon oxynitride Convert to a thin film.
- the oxygen atmosphere is formed by, for example, air, oxygen gas, ozone, or the like. Moreover, it can convert into a silicon oxynitride film
- the ratio of the constituent elements of silicon, nitrogen, oxygen, and hydrogen in the film can be changed.
- a thin film such as silicon oxide on the inside of the film and silicon oxynitride on the surface and its vicinity by first irradiating ultraviolet rays in an oxygen atmosphere and then setting a nitrogen atmosphere in the middle.
- the wavelength of the ultraviolet light to irradiate is not specifically limited. Generally used is 100 nm to 450 nm. Light having such a wavelength can be obtained by an excimer laser or the like in addition to a deuterium lamp, a xenon lamp, a metal halide lamp, an excimer lamp, a mercury lamp, or the like.
- the thickness of the smectite silicate compound-containing silicon oxide thin film or silicon oxynitride thin film obtained by the above method is not particularly limited. Generally used thickness is 10 nm or more and 100 ⁇ m or less, preferably 20 nm or more and 2 ⁇ m or less.
- this thin film is a plate-like smectite silicate molecular layered compound arranged in parallel to the film surface in a silicon oxide thin film or a silicon oxynitride thin film.
- Such an array structure is an orientation state in which water vapor / gas barrier properties and mechanical strength are most effectively exhibited.
- this thin film may be formed with a single layer thin film, and may be formed with the multilayer thin film which laminated
- the thin film containing the smectite group layered silicate compound may be disposed at any position in the layer to be laminated. More preferably, it is used when the outermost layer is formed at a position close to the outer layer. Further, a plurality of layers of the multilayer may be formed of a thin film containing a smectite group layered silicate compound.
- the thin film obtained in the present invention is preferably used as a protective film for organic EL devices, but is not limited thereto, and may be applied to various electronic elements such as transistors and solar cells. Specifically, it is applied on a semiconductor material film, a substrate, an electrode, a dielectric film or the like.
- the composition of the organic semiconductor is not particularly limited, and may be composed of a single substance or may be composed of a mixture of a plurality of substances. Furthermore, it can also be constituted by a layered structure of several substances. The following are known as organic semiconductor materials exhibiting excellent characteristics so far. Anthracene, tetracene, pentacene or derivatives thereof substituted at the terminal. ⁇ -sexual thiophene.
- Perylenetetracarboxylic dianhydride PTCDA or a derivative substituted at its terminal.
- the method for manufacturing the semiconductor layer is not particularly limited, and any method may be used.
- vapor deposition methods such as vacuum evaporation are often used, but from the viewpoint of simple and low cost production, spin coating, dip coating, bar coating, screen printing, gravure printing, flexographic printing, offset printing are used.
- a printing technique such as ink jet printing, which is prepared by mixing a material with a solvent and applying the solution from a solution, is applied.
- a printing method called soft lithography such as microcontact printing or micromolding can be applied.
- the electrode material metals such as gold, silver, platinum, palladium, aluminum, copper and magnesium, compound conductors such as ITO and IZO, and alkali metals such as lithium and calcium are often used, but are not limited thereto. It is not something.
- the manufacturing method is not particularly limited, and any method may be used. A generally used method is plating wiring or the like, but a wet manufacturing process or the like applied from or attached to a solution such as gravure printing, screen printing, and inkjet printing is also applied.
- conductive organic materials such as thiophene-based conductive polymer (PEDOT), polyaniline, and derivatives thereof can be used in addition to silver paste, gold paste, and carbon paste. It is also possible to apply a dry manufacturing process different from the above, such as a vacuum deposition method or a sputtering method.
- the material for forming the dielectric layer is not particularly limited, and any material may be used. Generally, SiO 2 or the like is preferably used, but a material having a large dielectric constant can also be used in order to obtain a more effective electric field effect. For example, Al 2 O 3 , ZrO 2 , Ta 2 O 5, La 2 O 3 and the like can be mentioned, but are not limited thereto.
- polymer dielectrics such as polymethyl methacrylate, polyimide, polystyrene, polyparaxylene, polyvinylidene fluoride, polyvinylphenol, pullulan, and the like can also be used.
- Example 1 An n-type silicon wafer is subjected to ultrasonic cleaning for 15 minutes with a neutral detergent (Iuchi Seieido Co., Ltd .: Pure Soft) diluted 5 times with pure water, and then ultrasonically cleaned for 15 minutes in pure water. The impurities were removed. Furthermore, ultraviolet irradiation cleaning was performed for 20 minutes in an oxygen atmosphere using an ultraviolet-ozone cleaner. On the substrate thus cleaned, 5 wt.% Of Lucentite SPN (manufactured by Co-op Chemical) dichloroethane solution and 20 wt.% Of polysilazane NP110 (manufactured by AZ Electric Materials) were formed at a weight ratio of 0:10.
- a neutral detergent Iuchi Seieido Co., Ltd .: Pure Soft
- FIG. 2 shows an infrared absorption spectrum after irradiation with light of 172 nm in a nitrogen atmosphere.
- absorption attributed to the bond of silicon and oxygen was observed mainly at 1050 cm ⁇ 1 , confirming that the polysilazane was changed to network-like SiO 2 .
- absorption due to the bond between silicon and oxygen in the tetrahedron structure of clay was observed at 950 cm -1. It can be seen that it is present in the SiO 2 in the shape.
- 3 and 4 show AFM images of the film surface produced by the above method.
- the weight ratio of Lucentite SPN (clay) to polysilazane is 6: 4 or 8: 2
- a plate structure with a length of 100 nm corresponding to one layer of smectite silicate compound is observed.
- smectite silicate is used. It was confirmed that the compound and the silicon oxide compound were not sufficiently combined, and the smectite silicate compound was exposed on the film surface.
- the polysilazane content is high, a structure longer than the length of the smectite silicate compound was observed.
- Lucentite SPN and polysilazane were complexed at the nano level, and the structure was several times larger. It turns out that it is.
- This composite at the nano level is a structure that is denser than a film in which smectite silicate compounds are simply arranged and can be expected to have high barrier properties.
- FIG. 5 shows a cross-sectional TEM image after irradiating a thin film with a weight ratio of 5: 5 of Lucentite SPN and polysilazane produced by the same method as described above.
- the vertical direction in the figure is the thickness direction of the cross section.
- a smectite silicate compound having a thickness of about 1 nm and a length of about 100 to 300 nm was observed as a black line in the image. This corresponds to one smectite layer, and it was confirmed that they were arranged almost parallel to the substrate surface.
- Example 2 On a PET substrate having a thickness of 50 ⁇ m, a 5 wt.% Lucentite SPN (Coop Chemical Co.) dichloroethane solution and 20 wt.% Polysilazane NP110 (AZ Electric Materials Co., Ltd.) in a weight ratio of 0:
- FIG. 6 shows the results of evaluating the influence of the clay addition of each film produced by the above method on the barrier property against water vapor by the cup method (JIS Z0208).
- each film was formed as a thin film of 400 nm or less.
- the amount of water vapor permeation decreased in the substrate coated with each film.
- the highest barrier properties were confirmed for PET substrates coated with a 4: 6 weight ratio of Lucentite SPN to polysilazane.
- Example 3 When a protective film is applied only to a specific part, various printing methods such as screen printing, gravure printing, flexographic printing, letterpress printing, intaglio printing, offset printing, ink jet method, dispenser method, drop cast method, etc. A method is envisaged and the solution needs to be adjusted to a viscosity suitable for the method. Generally, it is required to arbitrarily adjust in the range of 0.05 to 100 Pa ⁇ s. 10 to 100 Pa ⁇ s is suitable for letterpress printing, 0.1 to 0.2 Pa ⁇ s for flexographic printing, 0.05 to 0.2 Pa ⁇ s for gravure printing, 100 Pa ⁇ s for offset printing, and 1 to 10 Pa ⁇ s for screen printing. Is done.
- Table 1 shows the viscosity of the solution when the concentration ratio of Lucentite SPN (manufactured by Corp Chemical) dichloroethane solution and polysilazane NP110 (manufactured by AZ Electric Materials) is changed. It was confirmed that the viscosity can be adjusted to almost all printing methods by adding an arbitrary concentration of the smectite silicate compound. When the concentration ratio of SPN and polysilazane was 4: 6, the viscosity of the solution exceeded 100 Pa ⁇ s. However, it can be adjusted to a low viscosity by diluting with a solvent.
- a B-type viscometer is used to measure the viscosity at 6 and 60 rotations, and the thixotropic index value (TI value) is calculated from (viscosity at 6 rotations) / (viscosity at 60 rotations).
- FIG. 7 shows the TI value of the solution when the concentration ratio of Lucent SPN (manufactured by Corp Chemical) dichloroethane and polysilazane NP110 (manufactured by AZ Electric Materials) is changed. It was confirmed that by adding clay, it can be adjusted to a TI value of 3 or more, which is generally regarded as having thixotropy.
- a silicon oxide or silicon oxynitride thin film having high water vapor / oxygen barrier properties and high strength can be efficiently produced by a solution process having a production advantage.
- This method can be produced by a coating process on a plastic substrate with low heat resistance, and the thin film gives high durability. Enables large area and flexible elements.
- the present invention can be used for mass production of electronic devices such as flexible displays, electronic packing tags, electronic posters, and electronic papers that are highly required for impact resistance, weather resistance, portability, and low cost.
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Abstract
Description
有機EL素子は表示素子の中で画質性能に優れ、且つ超薄型化が容易であることから、プラスチック基板への適応において最も有望視されている。
今日、上記の要求を満たす発光層用材料や電荷輸送材料が種々開発されているが、これらは酸素又は水等の周囲環境に弱いという問題点を有している。
このため、有機EL素子の耐環境性を高めるための保護膜を設置することが必要となっている。しかし、有機EL素子を塗布プロセスでフレキシブル基板上に作製する場合、保護膜も塗布プロセスで作製することが求められるが、フレキシブル性が期待できる材料は得がたく、また、溶液プロセスによる製造方法で作製された保護膜は、その機能が十分果たせないでいるという問題が生じている。
また、フレキシブル基板上の素子への適合性を高める目的のためには、曲げ応力耐性が高くなる保護膜として、無機材料と有機材料とを交互に積層し、素子中における保護膜の応力緩和をさせる技術の提案等がある(下記「特許文献2」参照)。
また、保護膜機能の中でも、特に耐透湿性を向上させる技術としては、保護層中に、水分の吸着剤として五酸化リンやシリカゲル等を分散させる方法の報告等がある(下記「特許文献3」参照)。
従って、有機ELデバイスの全ての部材を溶液プロセスで作製することが困難であったため、その工程に関しては真空プロセスを適応しなければならず、溶液プロセスの生産優位性を発揮できないということが課題となっている。
また、ゾルゲル法を用いて金属酸化物ガラスに雲母を分散させた例もあるが、製法の特性上緻密な膜は得られず、高いバリア性は得られない(下記「参考特許6」など)。
すなわち、この出願によれば、以下の発明が提供される。
〈1〉重量比50%以下のスメクタイト族珪酸塩層状化合物が膜面に対して実質的に平行に配向した層状構造を形成していることを特徴とする酸化ケイ素薄膜または酸窒化ケイ素化合物薄膜。
〈2〉スメクタイト族珪酸塩化合物が、下記一般式で表される材料であることを特徴とする〈1〉に記載の薄膜。
〈3〉上記スメクタイト族珪酸塩化合物を含むシラザン化合物溶液の塗膜を基板表面に塗設し、該塗膜を酸素雰囲気下で紫外線照射することを特徴とする請求項1または2に記載の薄膜の製造方法。
この方法により得られる、スメクタイト族珪酸塩化合物を含有する酸化ケイ素薄膜または酸窒化ケイ素薄膜は、酸素等に対するガスバリア性、耐透湿性更に耐衝撃性に優れているため、有機ELデバイスをはじめとする電子デバイスの保護膜として利用でき、素子の耐久性が向上する。また、プラスチック基板上に塗設することができ、耐衝撃性も強いことから、応用適用範囲が広く、フィルム素子化、大面積素子化、フレキシブル素子化を進展させるための技術として多いに期待されるものである。
20 電子素子
30 酸化ケイ素薄膜
40 スメクタイト族珪酸塩層状化合物
このシラザン化合物を含む塗膜は、酸素雰囲気下或いは窒素を含む酸素雰囲気下での紫外線光照射により、アンモニアや酸素を発生し、酸化ケイ素薄膜または酸窒化ケイ素薄膜に転化する。また同様の膜に酸素を含まない窒素雰囲気下或いは真空下で紫外光照射を行うことによって酸窒化ケイ素薄膜を得ることができる。
したがって、本発明方法は、たとえば、有機EL素子を塗布プロセスでフレキシブル基板上に作製すると同時にその保護膜も塗布プロセスで作製することができ、しかも作製された保護膜は、高い水蒸気・酸素バリア性と高い強度を有する無機系のものであって、その機能が十二分に発揮されることから、前述した従来の有機ELデバイスの抱える問題点を全て解消することができる。
また、使用溶媒に可溶であれば酸素原子や炭素原子等、それら以外の元素を含んでも構わない。このようなシラン化合物としては、たとえば、市販のアルキルシロキサン系のHOSP、ACCUGLASS、ACCUFLO(Honeywell社製)、HSG(日立化成工業製)OCDT-9、OCLT(日立化成工業製)、LKD-T200、LKD-T400(JSR製)、ALCAP-S(旭化成工業製)、silica aerogel(神戸製鋼所製)、PolyELK(Air Productsand Chemicals,Inc製)等も用いることもできる。
このような酸化ケイ素薄膜または酸窒化ケイ素化合物薄膜としては、SiO2等の酸化物や、SiON等の酸窒化物等の珪素原子、酸素原子、水素原子、窒素原子の全ての元素又はその中の一部の元素で構成される固体薄膜等が挙げられる。
また、本発明方法で得られる上記薄膜は、板状のスメクタイト珪酸塩化合物は膜面に対して並行に配列した構造を採る。
これらの代表的な化合物としては、ヘクトライト、モンモリロナイト、バイデライト、ノントロナイト、サポナイト、ソーコナイト、スチブンサイトサポナイト、スインホルダイト、バイデライト、ノントロナイト、ボルコンスコアイト等が挙げられるが、これに限定されるものではない。またリン酸塩やアンモニウム塩などの有機材料によって修飾されたスメクトタイトケイ酸塩や、イオナイト、ガレオンアース、ミズカナイト、ベンクレイ、シルホナイト、エードプラス(水澤化学工業製)やルーセンタイト(コープケミカル社製)、ラボナイト(ラポルテインダストリー社)DP-DM又はDMクリーン(トピー工業(株)製)等の市販の合成スメクタイトを用いることができる。
一般に好適に用いられる方法は、スピンコーティング、ディップコーティング、バーコーティング、スプレイコーティング、ブレードコーティング等のコーティング法であるが、特定部位にだけ塗設される場合には、スクリーン印刷、グラビア印刷、フレキソ印刷、凸版印刷、凹版印刷、オフセット印刷等の印刷法や、インクジェット法、ディスペンサー法、ドロップキャスト法等も用いることができる。また、この際用いられる溶媒は特に限定されず、下地層に対して損傷を与えないものであるなら、いかなる溶媒を用いても構わない。下地の種類に応じて、適宜選択することができる。
この反応条件下で、上述したように、シラザン化合物を含む塗膜は、酸素雰囲気下或いは窒素を含む酸素雰囲気下での紫外線光照射により、アンモニアや酸素を発生し、酸化ケイ素薄膜または酸窒化ケイ素薄膜に転化する。
酸素雰囲気は、たとえば、空気、酸素ガス、オゾンなどによって形成される。また窒素雰囲気下で紫外線照射を行うことで酸窒化ケイ素膜に転化することができる。さらに、光照射の最中にガス雰囲気を変化させることで、膜中でのケイ素、窒素、酸素、水素の構成元素の比率を変化させることもできる。例えば、はじめ酸素雰囲気で紫外線照射を行い、途中で窒素雰囲気にすることで、膜内部は酸化ケイ素、表面とその付近は酸窒化ケイ素といった薄膜を形成することが可能である。
また、照射する紫外光の波長は、特に限定されない。一般的に用いられるのは、100nmから450nmである。こうした波長の光は、重水素ランプ、キセノンランプ、メタルハライドランプ、エキシマランプ、水銀ランプ等のほか、エキシマレーザー等により得ることができる。
この薄膜の代表例は、図1に示すように、酸化ケイ素薄膜中または酸窒化ケイ素薄膜中に平板状のスメクタイト族珪酸塩分子層状化合物が膜面に対して並行に配列されているものである。このような配列構造は、水蒸気・ガスバリア性、機械的強度を最も効果的に発揮される配向状態である。
また、この薄膜は、単層薄膜で形成されても構わないし、また異なる薄膜を積層した多層薄膜で形成されても構わない。多層薄膜で形成される場合、スメクタイト族層状珪酸塩化合物を含有する薄膜は、積層する層のどの位置に配しても構わない。
より好適に用いられるのは、最外層あるいは外層に近い位置に形成されている場合である。また、多層のうち複数層がスメクタイト族層状珪酸塩化合物を含有する薄膜で形成されていても構わない。
アントラセン、テトラセン、ペンタセン又はその末端が置換されたこれらの誘導体。α-セクシチオフェン。ペリレンテトラカルボン酸二無水物(PTCDA)又はその末端が置換された誘導体。ナフタレンテトラカルボン酸二無水物(NTCDA)又はその末端が置換された誘導体。銅フタロシアニン又はその末端がフッ素等で置換された誘導体。銅フタロシアニンの銅が、ニッケル、酸化チタン、フッ素化アルミニウム等で置換された誘導体又はそれぞれの末端がフッ素等で置換された誘導体。フラーレン、ルブレン、コロネン、アントラジチオフェン又はそれらの末端が置換された誘導体。ポリフェニレンビニレン、ポリチオフェン、ポリフルオレン、ポリフェニレン、ポリアセチレン又はこれらの末端若しくは側鎖が置換された誘導体のポリマー。
n型シリコンウェハーを、純水にて5倍希釈した中性洗剤(井内盛栄堂社:ピュアソフト)にて15分間超音波洗浄を行い、その後、純水中にて15分間超音波洗浄を行い、不純物の除去を行った。さらに、紫外線-オゾン洗浄器を用いて、酸素雰囲気下において20分間紫外線照射洗浄を行った。このようにして洗浄した基板上に、5wt.%のルーセンタイトSPN(コープケミカル社製)ジクロロエタン溶液と20wt.%のポリシラザンNP110(AZエレクトリックマテリアルズ社製)を製膜後に重量比で0:10、2:8、4:6、6:4、8:2、10:0になるようにそれぞれ混合した溶液を2000rpmでスピンコートして80℃で1時間乾燥させた。その後、真空チャンバー内で100℃で30分乾燥させた後、酸素と窒素の1:1混合ガスフロー下で172nmの紫外線を10分間照射した。
50μmの厚さのPET基板上に、5wt.%のルーセンタイトSPN(コープケミカル社製)ジクロロエタン溶液と20wt.%のポリシラザンNP110(AZエレクトリックマテリアルズ社製)を製膜後の重量比で0:10、2:8、4:6、6:4、8:2、10:0になるようにそれぞれ混合した溶液をブレードコート法で製膜し80℃で1時間乾燥させた。その後、真空チャンバー内で100℃で30分乾燥させた後、酸素と窒素の混合ガスフロー化で172nmの紫外線を10分間照射した。
特定部位にだけ保護膜を塗設する場合には、スクリーン印刷、グラビア印刷、フレキソ印刷、凸版印刷、凹版印刷、オフセット印刷等の印刷法や、インクジェット法、ディスペンサー法、ドロップキャスト法等の様々な方法が想定され、その方法にあった粘度に溶液を調整する必要がある。一般的には0.05~100 Pa・sの範囲で任意に調整することが求められる。凸版印刷では10~100 Pa・s、フレキソ印刷では0.1~0.2 Pa・s、グラビア印刷では0.05~0.2 Pa・s、オフセット印刷では100 Pa・s、スクリーン印刷では1~10 Pa・sが最適とされる。
この方法は、耐熱性の低い可塑性のあるプラスチック基板上に塗布プロセスによって作製できるものであり、その薄膜は高い耐久性を与えるものとなることから、製造工程の簡便・省エネルギー化と共にフィルム素子化、大面積化、フレキシブル素子化を可能とする。その結果、耐衝撃性、耐候性、携帯性、低コスト等を高度に要求されるフレキシブルディスプレイ、電子荷札、電子ポスター、電子ペーパー等の電子デバイスの大量生産化に利用可能である。
Claims (3)
- 重量比50%以下のスメクタイト族珪酸塩層状化合物が膜面に対して実質的に平行に配向した層状構造を形成していることを特徴とする酸化ケイ素薄膜または酸窒化ケイ素化合物薄膜。
- 上記スメクタイト族珪酸塩化合物を含むシラザン化合物溶液の塗膜を基板表面に塗設し、該塗膜を酸素雰囲気下で紫外線照射することを特徴とする請求項1または2に記載の薄膜の製造方法。
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| US13/061,495 US8673070B2 (en) | 2008-08-29 | 2009-08-28 | Process for producing silicon oxide thin film or silicon oxynitride compound thin film and thin film obtained by the process |
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| WO2012176291A1 (ja) * | 2011-06-22 | 2012-12-27 | AzエレクトロニックマテリアルズIp株式会社 | シリコンオキシナイトライド膜の形成方法およびそれにより製造されたシリコンオキシナイトライド膜付き基板 |
| KR101736888B1 (ko) * | 2011-06-22 | 2017-05-17 | 메르크 파텐트 게엠베하 | 실리콘 옥시나이트라이드 막의 형성 방법 및 이 방법에 의해 제조된 실리콘 옥시나이트라이드 막을 가지는 기판 |
| CN102617758B (zh) * | 2012-03-30 | 2013-05-29 | 北京化工大学 | 一种利用紫外光聚合在电场下制备取向高分子的方法 |
| CN102617758A (zh) * | 2012-03-30 | 2012-08-01 | 北京化工大学 | 一种利用紫外光聚合在电场下制备取向高分子的方法 |
| JPWO2014126117A1 (ja) * | 2013-02-12 | 2017-02-02 | 日立化成株式会社 | バリア層形成用組成物、バリア層付き半導体基板、太陽電池用基板の製造方法及び太陽電池素子の製造方法 |
| JPWO2021112116A1 (ja) * | 2019-12-05 | 2021-06-10 | ||
| JPWO2022138105A1 (ja) * | 2020-12-21 | 2022-06-30 | ||
| WO2022138105A1 (ja) * | 2020-12-21 | 2022-06-30 | パナソニックIpマネジメント株式会社 | 積層体、電子部品及びコンデンサ |
| JP7603263B2 (ja) | 2020-12-21 | 2024-12-20 | パナソニックIpマネジメント株式会社 | 積層体、電子部品及びコンデンサ |
| US12374495B2 (en) | 2020-12-21 | 2025-07-29 | Panasonic Intellectual Property Management Co., Ltd. | Laminate, electronic component and capacitor |
Also Published As
| Publication number | Publication date |
|---|---|
| US8673070B2 (en) | 2014-03-18 |
| JP5305476B2 (ja) | 2013-10-02 |
| US20110185948A1 (en) | 2011-08-04 |
| JPWO2010024378A1 (ja) | 2012-01-26 |
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