JP2014022357A - Seal material integrated with base material for electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal material having tolerance and low water vapor permeability for an enclosure substance 13, in a sealing technique of an electronic device 1 having a structure where the enclosure substance 13, e.g., an electrolyte, is enclosed between substrates 11, 12.SOLUTION: The seal material 14 is used in an electronic device 1 having a structure where the enclosure substance 13 is enclosed between a pair of substrates 11, 12 disposed to face each other, and seals the periphery of the enclosure substance 13. The seal material 14 consists of a base material 141 having barrier properties for water vapor; and gaskets 142, 143 which are provided on the surface of the base material 141 integrally therewith, and brought into tight contact therewith.

Description

  The present invention relates to a sealing technique of an electronic device having a structure in which an encapsulating substance such as an electrolyte is interposed between substrates, and for example, an electrolyte or organic EL (electroluminescence) between counter electrodes of a dye-sensitized solar cell. The present invention relates to a base material integrated sealing material that can be used as a sealing means for sealing gas between opposing substrates of a display.

  The dye-sensitized solar cell has an advantage that the manufacturing cost is lower than that of a silicon (Si) pn junction solar cell. Since this type of dye-sensitized solar cell has a structure in which a liquid or gel electrolyte is sealed between two electrode substrates, the sealing performance of the gasket for sealing the electrolyte and the resistance to the electrolyte are high. Improvement is important in the reliability and durability of the dye-sensitized solar cell.

Specifically, the dye-sensitized solar cell has a pair of transparent substrates 101 and 102 arranged to face each other via a sealing material 103, as shown in FIG. A transparent electrode 104 made of a transparent conductive film is formed on the surface of the transparent substrate 101 facing the other transparent substrate 102, and titanium oxide (TiO ₂ ) particles having a photosensitizing dye 105 b adsorbed on the transparent electrode 104. A porous semiconductor layer 105 made of 105a is provided, and a counter electrode 106 made of a transparent conductive film and a catalyst layer is formed on the opposite surface of the other transparent substrate 102 to the one transparent substrate 101. In the sealing gap defined by the sealing material 103 between the layer 105 and the counter electrode 106, for example, a liquid or gel electrolyte 10 containing iodine and iodide is provided. There has been sealed.

This type of dye-sensitized solar cell generates electricity by the following operation. By the light, such as hitting first sunlight transparent substrate 101, is excited by the photosensitizing dye 105b absorbs light electrons e ^- to release, the emitted electrons e ^- titanium oxide particles 105a Then, it moves to the transparent electrode 104 and further reaches the counter electrode 106 via the external load R. On the other hand, electrons e ^- photosensitizing dye 105b oxidized by releasing the iodide ions I in the electrolyte 107 ^- back to its original state by receiving, thereby iodide ion I ^{- -} electrons e from the The oxidized triiodide ion I ₃ ⁻ diffuses to the counter electrode 106 and is reduced by receiving electrons e ⁻ from the counter electrode 106 to become iodide ion I ⁻ . The reduced iodide ion I ⁻ is oxidized again by the photosensitizing dye 105b. A current flows through the external load R by repeating such oxidation and reduction.

  Conventionally, an adhesive such as a UV curable adhesive has been mainly used as the sealing material 103 for sealing the electrolyte 107 (see the following patent document).

  However, the sealing material 103 made of a UV curable adhesive may swell or deteriorate due to contact with the electrolyte 107 over a long period of time, and the sealing performance may be reduced. Further, when the electrolyte 107 is deteriorated by water vapor transmitted from the outside, there is a problem that not only the photoelectric conversion efficiency is lowered, but also the reliability and durability of the dye-sensitized solar cell are remarkably lowered.

  Moreover, since the substrates 101 and 102 are bonded to each other by the sealing material 103 made of a UV curable adhesive, there is a problem that they cannot be disassembled and have poor maintainability.

  In addition, a gasket made of a rubber-based material that does not swell or deteriorate with the electrolyte 107 may be used as the sealing material 103. However, the gasket made of a rubber-based material does not deteriorate the electrolyte 107 due to permeation of water vapor. There is a problem that it cannot be prevented.

JP 2007-087684 A JP 2009-245782 A

  The present invention has been made in view of the above points, and its technical problem is that it is resistant to an encapsulating substance in an electronic device encapsulating technique in which an encapsulating substance such as an electrolyte is enclosed between substrates. And providing a sealing material having low water vapor permeability.

  As means for effectively solving the technical problem described above, the base material integrated sealing material for an electronic device according to the invention of claim 1 has a structure in which an encapsulating substance is enclosed between a pair of substrates arranged to face each other. A sealing material that seals the surroundings of the encapsulating substance and is integrally provided on the surface of the base material and in close contact with the substrate. It is characterized by comprising a gasket. The “substrate” as used herein is a generic term including not only a single substrate but also a laminate in which an electrode made of a conductive film, a circuit pattern, a catalyst layer, and the like are laminated on a substrate.

  The base material integrated sealing material for an electronic device according to a second aspect of the invention is characterized in that, in the configuration of the first aspect, the gasket is made of a rubber material having electrolyte resistance or a synthetic resin material having rubber-like elasticity. It is what.

  According to the base material integrated sealing material for an electronic device according to the present invention, the base material does not swell or deteriorate as in the case where the substrates are sealed with an adhesive, and has a barrier property against water vapor. As a result, the water vapor transmission area is reduced, so that the water vapor transmission amount is reduced. As a result, leakage of the sealing target such as the electrolyte is effectively prevented, and deterioration of the encapsulated material such as the electrolyte due to the transmission of water vapor from the outside is also effectively prevented. Is done. Moreover, since the substrate is not bonded, the maintainability is also improved.

It is explanatory drawing which shows the base-material integrated sealing material for electronic devices which concerns on this invention with a part of electronic device. The base-material integrated sealing material for electronic devices which concerns on this invention is shown by the unmounted state, (A) is a top view, (B) is BB sectional drawing in (A). It is explanatory drawing which shows an example of the basic structure of a dye-sensitized solar cell as a conventional electronic device.

  Hereinafter, a preferred embodiment in which the base material integrated sealing material for an electronic device according to the present invention is applied as a sealing means for a dye-sensitized solar cell will be described with reference to FIGS. 1 and 2.

  In the electronic device 1 partially shown in FIG. 1, reference numerals 11 and 12 are laminates, which are arranged to face each other, and one of the laminates 11 is, for example, one transparent substrate in a dye-sensitized solar cell. The transparent electrode formed on the inner surface thereof and a porous semiconductor layer adsorbed with a photosensitizing dye, and the other laminate 12 is, for example, the other transparent substrate in the dye-sensitized solar cell. And the counter electrode formed on the inner side surface (the surface facing one laminate 11). The laminated bodies 11 and 12 correspond to the substrate described in claim 1.

  An encapsulating substance 13 such as a liquid or gel electrolyte containing iodine and iodide is encapsulated between the laminates 11 and 12, and the periphery thereof is sealed by the base material integrated sealing material 14 according to the present invention. Has been.

  Specifically, as shown in FIG. 2, the base material integrated sealing material 14 has a barrier property against water vapor and is inert to the electrolyte, preferably, for example, a thickness of about 60 μm. A frame-shaped base material 141 made of a thin plate of metal foil (for example, aluminum foil) or LCP (liquid crystal polymer: for example, STABIAX manufactured by Primatec Co., Ltd.), and among the surfaces of the base material 141, the laminates 11 and 12 On the opposite surface, a gasket formed integrally with a rubber material such as EPDM (ethylene propylene diene rubber) or VMQ (vinyl methyl silicone rubber) with high electrolyte resistance, or a fluorine-based synthetic resin material (PTFE, Saran, etc.) 142, 143.

  The gaskets 142 and 143 are in close contact with the laminates 11 and 12, and the gaskets 142 and 143 are thinner than the base material 141. Both surfaces of the base material 141 are formed by screen printing or the like. The film is formed to a thickness of, for example, about 5 to 50 μm by applying liquid rubber in a thin film and curing by crosslinking.

  That is, the base material integrated sealing material 14 having the above-described configuration is such that a sealing material such as a liquid or gel electrolyte enclosed between the laminates 11 and 12 is obtained by bringing the gaskets 142 and 143 into close contact with the laminates 11 and 12. In addition to preventing leakage of 13 to the outside, the base material integrated sealing material 14 has a barrier property against water vapor between the gaskets 142 and 143 and is inert to the electrolyte (for example, Since the base material 141 made of aluminum or LCP is provided, the permeation area of water vapor is reduced, so that deterioration of the encapsulating substance 13 such as an electrolyte due to permeation of water vapor from the outside is suppressed.

  Further, since the base material 141 made of metal (for example, aluminum) is integrally provided, the handling property and the assembling property are improved, and the base material 141 and the gaskets 142 and 143 are highly resistant to the electrolyte. It does not swell or deteriorate unlike a sealing material made of an adhesive such as an adhesive, and leakage can be prevented over a long period of time.

  Furthermore, since the gaskets 142 and 143 are not used to bond the laminates 11 and 12 like a sealing material made of an adhesive such as a UV curable adhesive, the laminates 11 and 12 can be easily separated. Maintenance can be performed.

  In the above-described embodiment, the case where the electronic device 1 is a dye-sensitized solar cell has been described. However, in the base material integrated sealing material 14 of the present invention, the electronic device 1 is, for example, an organic EL (electroluminescence) display. It can also be applied as a sealing means for sealed gas between the opposite substrates.

  That is, the organic EL display has a pair of glass substrates arranged to face each other, and an organic EL film and an electrode film are formed on one glass substrate facing the other glass substrate, and the other It has a structure in which dry nitrogen is sealed in a sealing gap defined by a sealing material between the glass substrate and the glass substrate. Conventionally, this type of organic EL display is also based on a UV curable epoxy resin as a sealing material. However, the intrusion of water vapor from the outside causes oxidation of the electrode film and deterioration of the performance of the organic EL film. Therefore, it is necessary to suppress moisture permeability as much as possible. Therefore, by using the base material integrated sealing material as described above as the sealing material, the permeation of water vapor can be effectively suppressed.

1 Electronic device 11, 12 Laminate (substrate)
13 Enclosed material 14 Base material integrated seal material 141 Base material 142, 143 Gasket

Claims (2)

  A sealing material that is used for an electronic device having a structure in which an encapsulating substance is enclosed between a pair of substrates arranged opposite to each other and seals the periphery of the encapsulating substance, and a base material having a barrier property against water vapor A base material integrated sealing material for electronic devices, comprising a gasket that is integrally provided on the surface of the base material and is in close contact with the substrate.   The base material integrated sealing material for electronic devices according to claim 1, wherein the gasket is made of a rubber material having electrolyte resistance or a synthetic resin material having rubber-like elasticity.

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