JP2008117698A - Dye-sensitized solar cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perfectly seal an inlet for a liquid material after filling the liquid material, and to enhance long-term reliability of sealing performance, in a dye-sensitized solar cell having a structure with the liquid material filled between two substrates. <P>SOLUTION: The inlet 5 is formed on a first substrate 1, the liquid material 3 is filled in a space from the inlet 5, and the inlet 5 is sealed by inserting a sealing plug 6 into the inlet 5. The shape of the inlet 5 is formed into a tapered shape broadened toward the outside surface of the first substrate 1 from the inside surface thereof, and the shape of the sealing plug 6 is preferably formed into a tapered shape tapering toward a tip in its insertion direction. In addition, the inlet 5 with the sealing plug 6 inserted therein is covered with a single or multilayer cover material 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dye-sensitized solar cell, and more particularly to a structure for sealing an injection port after a liquid material such as an electrolyte is sealed.

  A typical method for producing a dye-sensitized solar cell is as follows. A dye is adsorbed after a titanium oxide film is formed on a glass substrate on which a transparent conductive film is formed, and the negative electrode is treated with carboxylic acid or an organic metal salt to prevent reverse electron transfer after this adsorption. The positive electrode is formed by depositing Pt on a glass substrate on which a transparent conductive film is formed by vapor deposition, pyrolysis of Pt salt, electroplating, or the like. The positive electrode and the negative electrode are heat-sealed at about 110 ° C. using a sealing material such as an ionomer, and finally filled with an electrolytic solution.

In a dye-sensitized solar cell manufactured by such a process, in order to inject an electrolytic solution into the cell, an inlet is formed in the glass substrate, and the electrolytic solution is injected from the inlet into the cell by vacuum injection, pressure injection, or the like. Put in. After the cell is filled with the electrolytic solution, it is sealed with a mask glass or a rubber plug, and an ultraviolet curable resin or the like is applied and cured thereon.
Considering the characteristics of dye-sensitized solar cells that dislike UV-curable resin monomers and unreacted materials, a method of sealing a glass tube by melting it with a burner after laying the glass tube at the inlet and injecting the electrolyte (Patent Document 1)

  As other sealing methods for the inlet, a method of inserting a sealing block and fixing the gap with an epoxy resin (Patent Document 2), a thermosetting type of 50 to 40000 CPS, an ultraviolet curable resin, a silicone resin, or a fluorine resin (Patent Document 3), a method of using a glass tube laid on the inlet and injecting an electrolyte solution, and then using it as a circulation system for the electrolyte solution (Patent Document 4), sealing in a plastic bag with a chuck The method (patent document 5) to stop is mentioned.

  These methods are complicated in structure and costly, and have a drawback that they are weak in impact properties, so that the electrolytic solution is not completely sealed and has not been put into practical use.

  In a general method of sealing the inlet, there is a problem that the electrolyte permeates from the inlet, promotes peeling on the sealing adhesive surface, and the solvent of the electrolyte itself volatilizes. Yes. In particular, the solvent of the electrolyte is generally a low molecular weight solvent such as propylene carbonate, acetonitrile, ethylene carbonate, ethanol, ethyl ketone, etc., and the solvent that dissolves the adhesive is the solvent of the electrolyte. The phenomenon that the peeling progresses by dissolving the adhesive which is not partially cured even when the adhesive is cured, or by penetrating and swelling the adhesive interface where the adhesive is fixed has occurred. It was. In particular, when the temperature is increased, peeling of the sealing portion of the injection port is remarkable due to the vapor pressure of the electrolytic solution and the pressure due to volume expansion, which is a great hindrance for outdoor use.

  In addition, there is a known problem that the photoelectric conversion efficiency is greatly reduced when air or water penetrates from the outside air into the cell. However, the dye-sensitized solar cell adsorbs the dye on the porous semiconductor electrode surface on the negative electrode side. However, when the adhesive used for sealing is dissolved, it is adsorbed on the porous electrode on which the dye is adsorbed, and the photoelectric conversion efficiency is remarkably lowered.

For this reason, the sealing material required for the injection port is resistant to the organic solvent liquid inside the cell, has a barrier property against oxygen and humidity in the outside air, and is exposed to temperature and ultraviolet rays when exposed outdoors. Also, stability is required. Furthermore, since the sealing plug installed in the injection port receives a large pressure due to the rise in the temperature of the solar battery cell, a sealing strength for fixing the sealing plug is required.
JP 2000-348783 A JP 2000-200267 A JP 2000-30767 A JP 2001-185244 A JP 2005-228613 A

  Therefore, the problem in the present invention is that in a dye-sensitized solar cell having a structure in which a liquid material is sealed between two substrates, the liquid material inlet can be completely sealed after the liquid material is sealed. The purpose is to increase the long-term reliability of the performance.

To solve this problem,
The invention according to claim 1 is a dye-sensitized solar cell in which two substrates are overlapped via a gap, a liquid material is filled in the gap, and a peripheral portion of the substrate is sealed with a sealing material. ,
An inlet is formed in one of the substrates, a liquid material is filled into the gap from the inlet, and a sealing plug made of a material having a contact angle of 90 degrees or more with the liquid material is inserted into the inlet. The dye-sensitized solar cell is characterized in that the inlet is sealed.

The invention according to claim 2 is a dye-sensitized solar cell in which two substrates are overlapped via a gap, a liquid material is filled in the gap, and a peripheral portion of the substrate is sealed with a sealing material. ,
An inlet is formed in the sealing material, the liquid material is filled into the gap from the inlet, and a sealing stopper made of a material having a contact angle of 90 degrees or more with respect to the liquid material is inserted into the inlet so that the inlet is It is a dye-sensitized solar cell that is sealed.

The invention according to claim 3 has a tapered shape in which the inlet is divergent from the inner surface to the outer surface of the substrate,
3. The dye-sensitized solar cell according to claim 1, wherein the sealing plug has a tapered shape that is tapered toward the tip in the insertion direction.

  The invention according to claim 4 is the dye-sensitized solar cell according to any one of claims 1 to 3, wherein the inlet into which the sealing plug is inserted is covered with a cover material in a single layer or more. .

  In the present invention, as the sealing plug, by using a material having a contact angle with respect to the liquid material of 90 degrees or more, for example, a material made of a fluororesin material, the sealing plug repels the liquid material, The liquid material does not leak from a slight gap between the inlet and the sealing plug, and the leakage of the liquid material can be further prevented. As the sealing plug, one molded in advance from a material with good corrosion resistance can be used, so that it is not attacked by the liquid material filled therein, the sealing performance is improved, and further the sealing plug Therefore, unnecessary substances are not eluted into the liquid material.

In addition, if the shape of the inlet is tapered toward the inner surface, and the sealing plug is a conical taper that matches the shape of the inlet, the inlet will be And can be completely occluded. Further, when the sealing plug is inserted into the injection port, the air inside the injection port is completely pushed out, does not stay inside, and does not enter the liquid material as bubbles. Moreover, in the case where the sealing plug and its peripheral portion are covered with the cover material, the sealing of the injection port can be made more reliable and the separation of the sealing plug can be prevented. For this reason, volatilization of a liquid material is prevented and the reliability of sealing performance further improves.
Since the sealing plug forms a liquid seal using the water repellent effect on the electrolyte, it is insufficient for the gas barrier property, but as a cover material formed on the sealing plug, it is resistant to water vapor, oxygen, etc. The sealing performance can be further improved by forming the gas barrier property.

1 to 3 show an example of the dye-sensitized solar cell of the present invention. In these drawings, reference numeral 1 denotes a first substrate, reference numeral 2 denotes a second substrate, and reference numeral 3 denotes a liquid material.
The first and second substrates 1 and 2 are flat and smooth plates made of glass, plastic, ceramic or metal and having a thickness of about 2 to 5 mm.

A transparent conductive film and a dye-supported metal oxide semiconductor film are formed on the inner surfaces of these substrates 1 and 2 in accordance with the use of the dye-sensitized solar cell. Is also omitted.
Moreover, as the liquid material 3, an ionic electrolyte solution or the like according to the use of the dye-sensitized solar cell is used.

The 1st board | substrate 1 and the 2nd board | substrate 2 are bonded together by the sealing material 4 in those peripheral parts. For the sealing material 4, a resin such as ionomer, a low melting point glass frit, or the like is used.
The space between the first substrate 1 and the second substrate 2 is filled with the liquid material 3.

An inlet 5 is formed at one of the four corners of the first substrate 1, and the inlet 5 is in a state in which a sealing plug 6 is inserted. The inlet 5 is used for injecting the liquid material 3. The position of the inlet 2 is a position that avoids the functional thin film formed on the inner surfaces of the substrates 1 and 2.
As shown in FIG. 3, the inlet 5 has a tapered shape that is conical and has a bowl shape that decreases in diameter toward the inner surface of the substrate 1. The opening diameter on the outer surface (front surface) side of the substrate 1 is 1 to 40 mm, the opening diameter on the inner surface side of the substrate 1 is 0.5 to 30 mm, and the slope of the slope represented by the angle α in FIG. 45 degrees or less, preferably 45 to 30 degrees. The injection port 5 can be formed by cutting.

The sealing plug 6 has a truncated conical taper shape having an outer surface shape that matches the inner surface shape of the inlet 5. The outer diameter of the sealing plug 5 is slightly larger than the inner diameter of the injection port 5, for example, about 0.05 to 0.1 mm. When the sealing plug 6 is inserted into the injection port 5, it is pushed lightly. The sealing plug 6 can be mechanically pressure-bonded to the inner surface of the injection port 5.
As a material for forming the sealing plug 6, a resin such as glass, ceramic, metal, ionomer, or fluorine resin is used.

  Among these materials, those having a contact angle of 90 ° or more with respect to the liquid material 3 are repelled at the contact interface between the sealing plug 6 and the liquid material 3, and the liquid material 3 is injected into the inlet 5. It is preferable in that it does not permeate through a minute gap between the sealing plug 6 and the sealing material 6 and the liquid material 3 is not volatilized. Further, a material having good corrosion resistance with respect to the liquid material 3 is preferable.

  Examples of the material constituting the sealing plug 6 satisfying such characteristics include polytetrafluoroethylene (fluorinated ethylene resin: PTFE), perfluoroalkoxyalkane (tetrafluoroethylene perfluoroalkyl vinyl ether copolymer resin: PFA). Perfluoroethylene propene copolymer (tetrafluoroethylene-hexafluoropropylene copolymer resin: PFEP), ethylene-tetrafluoroethylene copolymer (tetrafluoroethylene-ethylene copolymer resin: ETFE), polyvinylidene fluoride (fluoride) Vinylidene resin: PVDF), polychlorotrifluoroethylene (trifluoroethylene chloride: PCTFE), ethylene-chlorotrifluoroethylene copolymer (ethylene trifluoride-ethylene copolymer: ECTFE), tetrafluoroethylene-par Luo Roy benzodioxole copolymer: TFE / PDD), polyvinyl fluoride (vinyl fluoride resin: PVF) fluorine-based resins such as silicone resins, and silicone rubber.

The entire sealing plug 6 may be made of these materials, but the sealing plug 6 is configured by covering these materials on the surface of the main body made of metal, glass, ceramic, other resin, or the like. May be.
Such a sealing plug 6 can be manufactured by an injection molding method if it is made of resin, and by cutting if it is glass, ceramics, or metal.

4 and 5 show a modification of the sealing plug 6. The example shown in FIG. 4 is a sealing plug 6 comprising a substantially cylindrical outer cylinder 61 made of the above material and a rod-like body 62 made of glass, metal, ceramics, or the like that penetrates the inside of the outer cylinder 61.
The example shown in FIG. 5 uses a pipe body 63 such as a glass tube or a metal tube instead of the rod-like body 62 in the example shown in FIG. 4. In this example, after filling the liquid material 3, the pipe body 63 is melted and sealed for use, and the pipe body 63 can be cut and the liquid material 3 added or exchanged as necessary.

  Further, a cover material 7 is provided on the upper portion of the sealing plug 6, and the surface of the sealing plug 6 and its peripheral substrate 1 is covered with the cover material 7. The cover material 7 is used for more reliably sealing the inlet 5 with the sealing plug 6 to suppress the volatilization of the liquid material 3 and to prevent the sealing plug 6 from being detached. These are formed using resin such as ionomer and ultraviolet curable resin, solder, water glass and the like.

The cover material 7 may be a single layer as shown in FIG. 2, but it is preferable to provide a double or more layer using different materials.
In the example shown in FIG. 6, a double cover material is provided. A primary cover 71 made of water glass is coated on the sealing plug 6 with water glass 71, and an acrylic ultraviolet curable resin 72 is applied thereon. Is applied and cured.

In the example shown in FIG. 7, a glass plate 73 is placed on the sealing plug 6, a water glass 74 is applied around the glass plate 73, and an epoxy resin 75 is applied and cured on the glass plate 73. is there.
In the example shown in FIG. 8, an ultraviolet curable resin 76 is applied and cured on the sealing plug 6, a low melting point solder 77 is disposed thereon, and an epoxy resin 78 is applied and cured. The low melting point solder preferably contains any of In, Ag, Bi, Te, and Pb as a main component, and the melting point is preferably 300 ° C. or lower.

The example shown in FIG. 9 uses the sealing plug 6 having the structure shown in FIG. 5 and surrounds and reinforces the periphery of the outer cylinder 61 with a glass plate 79. A curable resin 80 is applied and cured.
The example shown in FIG. 10 uses the sealing plug 6 having the structure shown in FIG. 5 and surrounds the outer cylinder 61 with a glass cylinder 81 to reinforce it. A rubber cap 82 is put on and bonded.

  In addition, as the material for covering the sealing plug 6, the solvent vapor from the liquid material 3 is always in contact with each other, so that the barrier property and the solvent resistance against the solvent here are necessary. Examples thereof include a gel film prepared by hydrolyzing metal alkoxide, a gel film using a sol prepared by hydrolyzing metal alkoxide, a silicone resin having a siloxane bond, and an organic-inorganic hybrid material having a siloxane bond.

Examples of the ultraviolet curable resin that covers the sealing plug 6 include epoxy acrylate, urethane acrylate, polyester acrylate, unsaturated polyester, polyether acrylate, vinyl acrylate, polybutadiene acrylate, and polystyrylethyl methacrylate.
In thermosetting resins, representative resins include epoxy resins, phenol resins, polyurethane resins, silicone resins, and polyimide resins.

  Furthermore, although not a curable type, a thermoplastic or heat-fusion type resin that can be used for pressing the sealing plug 6 is ABS resin, PP (polypropylene), PE (polyethylene), PS (polystyrene), PMMA ( Acrylic), PET (polyethylene terephthalate), PPE (polyphenylene ether), PA (nylon / polyamide), PC (polycarbonate), POM (polyacetal), PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), PEEK (polyether ether) Ketone), fluororesin, urethane resin and the like.

Moreover, as a material to form a film on the outermost surface of the sealing plug 6, nonpolar molecules are preferable among the above resins. By making the resin nonpolar, water contained in the resin is reduced and into the resin. Water impregnation can be prevented.
Examples of such nonpolar materials include polyolefin resins such as polyethylene resins, polypropylene resins, and ethylene propylene copolymers. These resins can be thermocompression-bonded on a sealing plug, and an adhesive can be applied thereon to be cured and fixed.

The laminated structure of the cover material 7 is not limited to a structure in which a highly solvent-resistant material with respect to the liquid material 3 is installed on the sealing plug 6 and a highly water-resistant film is formed thereon. What is formed on the sealing plug 6 is not required to be dissolved in at least the liquid material 3, and a glass plate may be installed thereon, and the whole may be fixed with an ultraviolet curable resin from above.
The cover member 7 may have a layered structure as long as it is formed on at least the sealing plug 6 to fix the sealing plug 6, but a layer having a gas barrier property on the sealing plug 6. It is desirable to stabilize the sealing by forming a plurality of layers having water resistance or the like.

  In such a dye-sensitized solar cell, since the injection port 5 of the liquid material 3 is formed in the substrate 1, the shape of the injection port 5 is constant as compared with a conventional sealing material in which the injection port is formed. Thus, this can be mechanically sealed with a sealing plug 6 that has been previously formed into a shape that matches the shape of the inlet 5. For this reason, the reliability of the sealing performance is remarkably improved as compared with the conventional method of pouring and sealing the curable resin liquid.

  In addition, the shape of the injection port 5 is tapered toward the inner surface, and the sealing plug 6 has a conical taper shape that matches the shape of the injection port 5. It can be completely closed without a gap. Further, when the sealing plug 6 is inserted into the injection port 5, the air inside the injection port 5 is completely pushed out and does not stay inside and does not enter the liquid material 3 as bubbles. .

Furthermore, if the sealing plug 6 is made of glass, ceramic, or fluororesin, the sealing plug 6 itself has excellent chemical resistance, so that it is not affected by the liquid material 3 inside. The eluate does not flow out from the sealing plug 6 and the liquid material 3 is not altered.
Further, by using a material having a contact angle of 90 degrees or more with respect to the liquid material 3 as a material forming the sealing plug 6, the liquid material 3 is repelled by the sealing plug 6 and between the sealing plug 6 and the injection port 5. Thus, the liquid material 3 does not enter the slight gap, and volatilization of the liquid material 3 is suppressed.

  Moreover, since the sealing plug 6 and its peripheral part are covered with the cover material 7, the injection port 5 can be more reliably sealed and the sealing plug 6 can be prevented from being detached. For this reason, the reliability of the sealing performance is further improved.

Further, in the present invention, the injection port 5 is formed at an appropriate portion of the sealing material 4, and after the liquid material 3 is injected and filled from the inside into the gap, the sealing plug 6 is inserted, if necessary. A structure for covering the cover member 7 can also be adopted.
In this case, it is desirable to select the material constituting the sealing material 4 so that the shape of the injection port 5 formed in the sealing material 4 is kept constant.

  Further, as the sealing material 4, a molded product that is injection-molded into a frame shape made of a thermoplastic resin such as ionomer is used, and the injection port 5 is molded at the same time as the injection molding, and a sealing plug is connected to the injection port 5. The two substrates 1 and 2 are joined using the sealing material 4 in a state in which 6 is inserted. Then, after the sealing plug 6 is once removed and the liquid material 3 is injected and filled, the sealing plug 6 is inserted again, and the cover member 7 can be covered as necessary.

Specific examples are shown below.
(Example 1)
A dye-sensitized solar cell was produced. As the first and second glass substrates, glass plates having a thickness of 3 mm, a width of 5 cm, and a length of 10 cm of soda glass on which a transparent conductive film was formed were used.
The two glass substrates were opposed to each other and thermally fused via an ionomer having a thickness of 60 μm to form a cell.

A negative electrode made of a dye-supported titanium oxide semiconductor film is formed on one side of the glass substrate, and a positive electrode made of a transparent conductive film carrying Pt is formed on the other side. An injection port was formed on this positive electrode side glass substrate by using a drill so that a hole with a diameter of 1 mm was formed on the surface in contact with the electrolytic solution and a hole with a diameter of 2 mm was formed on the outside.
And injecting an electrolyte solution composed of an acetonitrile to produce the cells were dissolved LiI and I ₂ to be uniform throughout the cell from the inlet.

A sealing plug having a height of 5 mm, a bottom diameter of 2.5 mm, and a top surface of 1 mm was prepared. The material of the sealing plug was made of PTFE fluororesin. Moreover, the sealing plug of the same shape was produced also with other fluorine resin, such as PVDF and PFA.
As a comparative example, a stopper having the same shape was prepared using silicone rubber, butyl rubber, PMMA (polymethyl methacrylate), and a glass stopper.

The contact angle of each material was measured and shown in Table 1. The volatilization amount of the solvent due to the difference in the sealing material was evaluated by a normalized value divided by the initial filling amount. As the volatilization condition, the sample was left indoors for 1 month at room temperature.
The results are shown in Table 2. From this result, it was found that at least a contact angle of 90 degrees or more is good.

In Example 1, after injecting the electrolytic solution, a sealing plug prepared using fluorine-based resin PTFE was pressed into the injection port, and the top of the sealing plug was made of various sealing materials as shown in FIG. It was covered with a cover material.
As the sealing material, water glass, acrylic resin-based ultraviolet curable resin, and epoxy resin were used. Each material was applied onto a sealing plug so as to have a thickness of about 2 mm and a diameter of about 4 mm and cured.

  Water glass was dried at 40 ° C. using Wako Pure Chemical as a curing condition for each sealing material. The acrylic resin UV curable resin was made by Nitto Denko and was cured by irradiation with a 100 W UV lamp for 5 minutes. The epoxy resin was cured at room temperature for 12 hours using an epoxy adhesive (manufactured by Huntsman Advanced Materials: product name Araldite).

The prepared sample cell was kept in a saturated steam at 70 ° C. for one week, and the volatilization amount of the electrolytic solution and the sealing state were examined.
The results are shown in Table 3. From this result, it was found that the solvent evaporates in the state where the cover material is not provided on the sealing plug, but the decrease due to the volatilization can be suppressed in the case where the cover material is provided.

(Example 3)
In Example 1, after injecting the electrolytic solution, a sealing plug made of fluororesin PVDF was pressed into the injection port, and the top of the sealing plug was 5 mm square with a thickness of 0.1 mm as shown in FIG. A glass plate was placed, and various sealing materials were applied thereon and cured.
As the sealing material, three types of water glass, acrylic resin-based ultraviolet curable resin, and epoxy resin were used in the same manner as in Example 2. Each material was applied and cured so as to cover a glass plate with a thickness of 2 mm and a width of 3 mm on a glass plate.
The curing conditions for each sealing material were the same as in Example 2.

The prepared sample cell was kept in a saturated steam at 70 ° C. for one week, and the volatilization amount of the electrolytic solution and the sealing state were examined.
The results are shown in Table 4. From this result, the solvent volatilizes in the state where the cover material is not provided on the sealing plug, but when the cover material is increased from one layer to two layers on the sealing plug, it is further caused by volatilization. It was found that the decrease can be suppressed.

(Example 4)
In Example 1, after injecting the electrolytic solution, the sealing plug produced using fluorine resin PFA was pressed into the injection port, and various sealing materials were applied on the sealing plug as shown in FIG. After curing, a solder layer having a thickness of 0.5 mm was provided using an ultrasonic solder apparatus (USM-3 manufactured by Kuroda Techno), and an epoxy resin was applied thereon and cured.
As various sealing materials, three kinds of water glass, acrylic resin-based ultraviolet curable resin, and epoxy resin were used in the same manner as in Example 3. Each material was applied and cured with a thickness of 2 mm and a diameter of 4 mm. The curing conditions for each sealing material were the same as in Example 2.

  The prepared sample cell was kept in a saturated steam at 70 ° C. for one week, and the volatilization amount of the electrolytic solution and the sealing state were examined. The results are shown in Table 5. From this result, the solvent evaporates when the cover material is not provided on the sealing plug. However, when the cover material is increased from two layers to three layers on the sealing plug, the solvent is further evaporated. It has been found that the decrease due to the

(Example 5)
In Example 1, a glass plate having a thickness of 3 mm was fused to the glass substrate at the inlet, and a hole having a diameter of 4 mm was formed therethrough as the diameter of the inlet. A glass plug inserted as shown in FIG. 9 into a sealing plug produced using PFEP was pressed against the injection port, and the sealing plug was fixed thereon with various sealing materials.
After injecting the electrolytic solution from the glass tube, the end of the glass tube was melted and sealed with a burner. As the sealing material, three types of water glass, acrylic resin-based ultraviolet curable resin, and epoxy resin were used in the same manner as in Example 2. Each material was applied to a thickness of about 1 mm and cured to the shape of FIG.

  The prepared sample cell was kept in a saturated steam at 70 ° C. for one week, and the volatilization amount of the electrolytic solution and the sealing state were examined. The results are shown in Table 6. From this result, it was found that the solvent evaporates in the state where the cover material is not provided on the sealing plug, but when the cover material is provided on the sealing plug, the decrease due to volatilization can be further suppressed.

It is a schematic perspective view which shows an example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows the principal part of an example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows the shape of the injection inlet in this invention. It is a schematic sectional drawing which shows the example of the sealing stopper in this invention. It is a schematic sectional drawing which shows the example of the sealing stopper in this invention. It is a schematic sectional drawing which shows the principal part of an example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows the principal part of an example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows the principal part of an example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows the principal part of an example of the dye-sensitized solar cell of this invention. It is a schematic sectional drawing which shows the principal part of an example of the dye-sensitized solar cell of this invention.

Explanation of symbols

1 ·· First substrate 2 ·· Second substrate 3 ·· Liquid material 4 ·· Seal material 5 ·· Inlet 6 ·· Sealing plug 7 ·· Cover material

Claims (4)

A dye-sensitized solar cell in which two substrates are overlapped via a gap, filled with a liquid material in the gap, and the peripheral edge of the substrate is sealed with a sealing material,
An inlet is formed in one of the substrates, a liquid material is filled into the gap from the inlet, and a sealing plug made of a material having a contact angle of 90 degrees or more with the liquid material is inserted into the inlet. A dye-sensitized solar cell, wherein an inlet is sealed. A dye-sensitized solar cell in which two substrates are overlapped via a gap, filled with a liquid material in the gap, and the peripheral edge of the substrate is sealed with a sealing material,
An inlet is formed in the sealing material, the liquid material is filled into the gap from the inlet, and a sealing stopper made of a material having a contact angle of 90 degrees or more with respect to the liquid material is inserted into the inlet so that the inlet is A dye-sensitized solar cell which is sealed. The injection port has a tapered shape that widens toward the outer surface from the inner surface of the substrate,
The dye-sensitized solar cell according to claim 1 or 2, wherein the sealing plug has a tapered shape tapered toward the tip in the insertion direction.   The dye-sensitized solar cell according to any one of claims 1 to 3, wherein the inlet into which the sealing plug is inserted is covered with a cover material in a single layer or more.

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