JP5348475B2 - Solar cell module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar cell capable of securing sealing properties over a long period of time by surely preventing a sealing material from being exposed to ultraviolet rays without reducing photoelectric conversion efficiency. <P>SOLUTION: A solar cell module X has a transparent conductive film 20 on one side face of a transparent base material 10, includes a light electrode 30, an electrolyte layer 40, and the counter electrode 50 which are laminated at a part of the transparent conductive film 20 in this order, and is equipped with a sealing material 60 sealed to the transparent conductive film 20 while covering the laminated light electrode 30, electrolyte layer 40, and the counter electrode 50. Between the transparent conductive film 20 and the sealing material 60, a light shielding part 71 made of the sealing material is equipped which shields light from the side of the transparent base material 10 from reaching the sealing material 60. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention has a transparent conductive film on one surface of a transparent substrate, and a photoelectrode, an electrolyte layer, and a counter electrode are sequentially laminated on a part of the transparent conductive film, and the laminated photoelectrode Further, the present invention relates to a solar cell module including a sealing material that covers the electrolyte layer and the counter electrode and seals the transparent conductive film.

In recent years, research on solar cells using photoelectric conversion elements has been widely conducted in order to solve global environmental problems, fossil energy resource problems, and the like.
Conventionally, as solar cells, for example, silicon solar cells using single crystal and polycrystalline silicon photoelectric conversion elements, dye-sensitized solar cells using a semiconductor containing a sensitizing dye as a photoelectric conversion element, and the like are known. It was.

  A dye-sensitized solar cell is a solar cell that uses an organic dye to obtain photovoltaic power, and has a structure in which a titanium dioxide layer that adsorbs a dye such as a ruthenium complex and an electrolyte layer are sandwiched between two electrodes have.

  As a dye-sensitized solar cell, for example, in Patent Document 1, an oxide semiconductor porous film coated on conductive glass and containing a dye, a counter electrode facing the oxide semiconductor porous film, an oxide semiconductor porous film, and A photoelectric conversion element having an electrolyte layer provided between counter electrodes is described. The conductive glass provided with the oxide semiconductor porous film and the counter electrode are bonded and sealed with an inorganic adhesive (sealing material). In sealing, the conductive glass and the counter electrode are pressurized, and the inorganic adhesive is locally heated while cooling the portion of the conductive glass and the counter electrode where the inorganic adhesive is not applied. Solidify the adhesive.

  In an inorganic adhesive used as a sealing material in Patent Document 1, inorganic particles such as alumina are dispersed in a solvent such as alcohol. When locally heating the inorganic adhesive, the inorganic adhesive may become porous and brittle when the solvent is vaporized. Thereby, the adhesiveness between the conductive glass and the counter electrode is lowered, and there is a possibility that the electrolytic solution evaporates from the electrolyte layer or water vapor penetrates from the outside.

  As a solar cell using a sealing material whose adhesiveness is relatively stable even when heated, for example, in Patent Document 2, a transparent conductive film and a porous semiconductor are sequentially formed on a transparent substrate. Layer, a separator layer made of a porous insulator, and a back electrode layer, and further provided with a sealing member (sealing material) covering the porous semiconductor layer, the separator layer, and the back electrode layer Is described. The sealing member has a metal layer and a heat welding resin layer, and the heat welding resin layer uses a polyolefin resin. In sealing, a part of the heat-welded resin layer is sealed by heating.

JP 2004-171814 A JP 2004-171827 A

  The polyolefin resin used as the sealing material in Patent Document 2 is bonded to the transparent conductive film by hydrogen bonding. When exposed to sunlight for a long period of time, the hydrogen bond is likely to be broken by ultraviolet light and visible light having a short wavelength (for example, 500 nm or less), and the adhesion between the transparent conductive film and the sealing material may be reduced. . For this reason, it has been difficult to ensure sealing properties over a long period of time.

  In addition, a sealing material formed using a material having a double bond such as methacrylate is likely to be broken by ultraviolet light and visible light having a short wavelength when exposed to light for a long time. .

  Usually, the ultraviolet light that has entered the solar cell passes through the transparent base material and reaches the transparent conductive film and the sealing material. In order to suppress a decrease in the adhesion between the transparent conductive film and the sealing material, it is necessary to prevent ultraviolet rays from entering the transparent substrate. Therefore, for example, an ultraviolet cut film that cuts ultraviolet rays may be attached to the surface on the sunlight incident side of the transparent substrate. However, since the ultraviolet cut film is only attached to the surface on the sunlight incident side of the transparent substrate, the ultraviolet rays reach the transparent conductive film and the sealing material from the side surface of the transparent substrate.

  Since both ultraviolet rays and visible light having a short wavelength are harmful to the sealing material, it is desirable that all of these can be cut. However, if the visible light necessary for solar power generation is cut off in an attempt to widen the wavelength range that can be cut by the ultraviolet cut film, the photoelectric conversion efficiency of the solar cell decreases.

  Accordingly, an object of the present invention is to provide a solar cell that can reliably prevent the sealing material from being exposed to ultraviolet rays without lowering the photoelectric conversion efficiency, and can ensure sealing performance over a long period of time. .

  The first characteristic configuration of the solar cell module according to the present invention for achieving the above object has a transparent conductive film on one surface of the transparent substrate, and a photoelectrode is sequentially formed on a part of the transparent conductive film. An electrolyte layer and a counter electrode, and a sealing material that covers the stacked photoelectrode, the electrolyte layer, and the counter electrode, and is sealed to the transparent conductive film, the transparent conductive film and the sealing A sealing material light-shielding portion that blocks light from the transparent substrate side from reaching the sealing material is provided between the material and the material.

According to this structure, even if sunlight is incident from the surface on the incident side of sunlight in the transparent substrate (the other side of the transparent substrate) and the side surface of the transparent substrate, sealing is performed between the transparent conductive film and the sealing material. Since the material light-shielding portion is provided, it is possible to prevent the sealing material from being exposed to ultraviolet rays from the transparent substrate side or visible light having a short wavelength. For this reason, a sealing material becomes difficult to deteriorate with sunlight, and the solar cell module of this structure can ensure sealing performance over a long period of time.
Since the sealing material light-shielding portion is provided between the transparent conductive film and the sealing material, visible light reaches the transparent base material, the transparent conductive film, and the photoelectrode. Therefore, the photoelectric conversion efficiency of the solar cell does not decrease.
Therefore, in this structure, it can be set as the structure which does not reach the ultraviolet rays and short visible light which are harmful to a sealing material, without interrupting | blocking the light required for photovoltaic power generation.

  The second characteristic configuration of the solar cell module according to the present invention has a transparent conductive film on one surface of the transparent substrate, and a photoelectrode, an electrolyte layer, and a counter electrode are sequentially formed on a part of the transparent conductive film. A sealing material that covers the laminated photoelectrode, the electrolyte layer, and the counter electrode, and that is sealed to the transparent conductive film, and ultraviolet rays are transmitted to the other surface of the transparent substrate. A UV cut portion that prevents entry into the material, and a side light blocking portion that prevents light from entering the transparent substrate from the side surface on the side surface of the transparent substrate.

According to this configuration, the UV cut part and the side light shielding part can prevent sunlight from entering the transparent base material from the other side and the side surface of the transparent base material. It is possible to prevent exposure to visible light having a short wavelength. Therefore, the sealing material and the photoelectrode are hardly deteriorated by sunlight.
For example, the photoelectrode of a dye-sensitized solar cell contains a sensitizing dye. Although the dye is easily decomposed by ultraviolet light and visible light having a short wavelength, in this configuration, the decomposition of the dye is suppressed.
Therefore, the solar cell module of this configuration can ensure long-term sealing performance, and the performance of the photoelectrode is difficult to deteriorate.

  A third characteristic configuration of the solar cell module according to the present invention is that the sealing material light-shielding portion is a light absorbing means for absorbing light or a reflecting means for reflecting light.

  According to this configuration, the light from the transparent substrate side can be reliably blocked from reaching the sealing material by the light absorbing means and the reflecting means.

  A fourth characteristic configuration of the solar cell module according to the present invention is that the side light-shielding portion is a light absorbing means for absorbing light or a reflecting means for reflecting light.

  According to this configuration, it is possible to reliably prevent light from entering the transparent substrate from the side surface of the transparent substrate by the light absorbing means and the reflecting means.

  A fifth characteristic configuration of the solar cell module according to the present invention is that the light absorbing means is a black paint.

  According to this configuration, the structure of the light absorption means can be easily formed.

  A sixth characteristic configuration of the solar cell module according to the present invention is that the reflecting means is a white paint.

  According to this structure, the structure of a reflection means can be formed simply.

It is sectional drawing which shows the outline of the solar cell module of this invention. It is sectional drawing which shows the outline of the solar cell module of another Embodiment 1. It is sectional drawing which shows the outline of the solar cell module of another Embodiment 2. It is the schematic which shows the manufacturing process of a solar cell module. It is the schematic which shows the manufacturing process of a solar cell module. It is the schematic which shows the manufacturing process of a solar cell module. It is a graph which shows the result of having investigated the light transmittance (%) about the solar cell module.

Embodiments of the present invention will be described below with reference to the drawings.
As a solar cell module of this embodiment, the dye-sensitized solar cell which uses the semiconductor containing a sensitizing dye for a photoelectric conversion element, for example is shown. The solar cell module is a panel formed by connecting a plurality of unit cells in series and parallel so as to obtain necessary voltages and currents.

  As shown in FIG. 1, the solar cell module X of the present invention has a transparent conductive film 20 on one surface of a transparent substrate 10, and a photoelectrode 30 and a part of the transparent conductive film 20 in order. The electrolyte layer 40 and the counter electrode 50 are laminated, and a sealing material 60 that covers the laminated photoelectrode 30, the electrolyte layer 40, and the counter electrode 50 and is sealed to the transparent conductive film 20 is provided. A sealing material light-shielding portion 71 that shields light from the transparent substrate 10 side from reaching the sealing material 60 is provided between the stopper material 60 and the sealing material 60.

In FIG. 1, sectional drawing at the time of connecting five (a1-a5) of the unit cells A which are one photoelectric conversion unit element in series is shown. For example, the unit cell a1 and the unit cell a2 are electrically connected by extending the counter electrode 50 of the unit cell a1 and connecting to the photoelectrode 30 of the unit cell a2.
Further, in the present embodiment, the UV cut portion 73 that prevents ultraviolet rays from entering the transparent substrate 10 is provided on the other surface of the transparent substrate 10.

(Transparent substrate)
As the transparent substrate 10, a transparent substrate used for a liquid crystal panel or the like can be applied. For example, a transparent glass substrate, a ground glass-like translucent glass substrate, or the like that transmits light can be used. The material is not limited to glass as long as it transmits light, and a plastic resin such as a transparent plastic plate, an inorganic transparent crystal, or the like can be applied.

(Transparent conductive film)
The structure of the transparent conductive film 20 is not specifically limited, The transparent electrode mounted in a normal dye-sensitized solar cell can be used. For example, a film-like transparent conductive film 20 is coated on one surface (photoelectrode 30 side) of the transparent substrate 10.
As the film-like transparent conductive film 20, a transparent electrode used for a liquid crystal panel or the like is applicable. Examples thereof include fluorine-doped SnO ₂ coated glass, ITO coated glass, ZnO / Al coated glass, antimony-doped tin oxide (SnO ₂ —Sb), and the like. In addition, a transparent electrode in which tin oxide or indium oxide is doped with cations or anions having different valences, or a metal electrode having a structure capable of transmitting light, such as a mesh or stripe, is provided on a substrate such as a glass substrate. But you can.
In this embodiment, the transparent conductive film 20 is cut into a plurality (scribing) to insulate adjacent transparent conductive films 20 from each other.

(Photoelectrode)
The photoelectrode 30 is composed of an oxide semiconductor layer containing oxide semiconductor particles as a constituent material. The oxide semiconductor particles contained in the photoelectrode 30 are not particularly limited, and known oxide semiconductors can be used. As the oxide semiconductor, for _example, a _{TiO 2 · ZnO · SnO 2 ·} Nb 2 O 5 · In 2 O 3 · WO 3 · ZrO 2 · La 2 O 3 · Ta 2 O 5 · SrTiO 3 · BaTiO 3 , etc. Can be used. Among these oxide semiconductors, anatase TiO ₂ is preferable.

  The photoelectrode 30 contains a sensitizing dye. The sensitizing dye is not particularly limited as long as it is a dye having absorption in the visible light region and the infrared light region. For example, it is preferable if it is excited by light having a wavelength of at least 200 nm to 10 μm and emits electrons. As such a sensitizing dye, a metal complex, an organic dye, or the like can be used. Examples of the metal complex include metal phthalocyanines such as copper phthalocyanine and titanyl phthalocyanine, chlorophyll or derivatives thereof, ruthenium, hemin, osmium, iron and zinc complexes. As the organic dye, metal free phthalocyanine, cyanine dye, merocyanine dye, xanthene dye, triphenylmethane dye, and the like can be used.

  In the solar cell module X, the sensitizing dye adsorbed in the photoelectrode 30 is excited by the light L that passes through the transparent substrate 10 and the transparent conductive film 20 and is applied to the photoelectrode 30, and light is emitted from the sensitizing dye. Electrons are injected into the electrode 30. Then, the electrons injected in the photoelectrode 30 are collected in the transparent conductive film 20 and taken out by the extraction electrode 80.

(Electrolyte layer)
The electrolyte layer 40 is filled in a space formed between the photoelectrode 30 and the counter electrode 50. The electrolyte layer 40 of the present embodiment shows, for example, a case where an electrolyte solution impregnated in a porous carrier (separator) 41 is used. In addition to the electrolyte solution, a known gelling agent (polymer or low molecular weight) is added to the electrolyte solution. It is good also as a gel-like electrolyte obtained by adding (gelling agent). The electrolyte layer 40 is not particularly limited as long as it contains a redox species for reducing the dye after being photoexcited and injecting electrons into the photoelectrode 30.

The solvent used in the electrolytic solution is not particularly limited as long as it is a compound that can dissolve a solute component, but a solvent that is electrochemically inactive, has a high relative dielectric constant, and has a low viscosity is preferable. Examples include nitrile compounds such as methoxypropionitrile and acetonitrile, lactone compounds such as γ-butyrolactone and valerolactone, carbonate compounds such as ethylene carbonate and propylene carbonate, and propylene carbonate.
Solutes used in the electrolyte layer 40 include sensitizing dyes contained in the photoelectrode 30 and redox couples capable of exchanging electrons with the counter electrode 50 (for example, I ₃ ⁻ / I ⁻ electrolytes, Br ₃ ⁻ / Br ^- based electrolytes, redox electrolytes such as hydroquinone / quinone-based electrolytes), compounds having an action of promoting the transfer of electrons, and the like, and these may be included singly or in combination.
Examples of the substance constituting the redox pair include halogens such as iodine, bromine, and chlorine, and halides such as dimethylpropylimidazolium iodide, tetrapropylammonium iodide, and lithium iodide. Examples of the additive for efficiently transferring electrons include heterocyclic compounds such as 4-t-butylpyridine and N-methylbenzimidazole.

(Counter electrode)
The counter electrode 50 is not particularly limited as long as it is made of a material capable of passing electrons with high efficiency to an oxidation-reduction pair (for example, I ₃ ⁻ / I ⁻ etc.) in the electrolyte. Examples include metals such as platinum, gold, silver, copper, aluminum, rhodium, and indium, metal oxides such as ITO (indium-tin oxide), FTO (fluorine-doped tin oxide), and zinc oxide, or carbon. . The thickness of the counter electrode is not particularly limited, but is preferably 5 nm or more and 10 μm or less.

(Encapsulant)
The encapsulant 60 needs to have corrosion resistance to the charge transporter and sealability to the electrolytic solution. For example, in the case of a charge transporter containing an iodine-based electrolyte in an organic solvent, it is necessary to prevent leakage of the organic solvent (sealability) and to have corrosion resistance against the organic solvent and iodine. Therefore, the sealing material 60 is not particularly limited as long as it has the corrosion resistance and the sealing property, but a polyolefin resin is preferable. Polyolefin resins have high crosslink density and do not have a double bond in the molecular skeleton, and therefore have excellent corrosion resistance and sealing properties. Among polyolefin-based resins, adhesive polyethylene, adhesive polypropylene, and iomonomer are particularly preferable because they contain a carboxyl group that is a polar group and have high adhesion.
The sealing material 60 may be one that is screen-printed or pre-molded, in addition to the liquid sealing material 60 that is extruded and applied from the sealing material container. Moreover, the sealing material 60 can be heat-welded or laser-welded.

  The outside of the sealing material 60 is covered with a moisture-proof material 90. As the moisture-proof material 90, for example, a film made of the same material as the sealing material 60, a PET vapor-deposited aluminum film, a sheet of inorganic material such as silicon dioxide, or the like can be used. The PET (polyethylene terephthalate) vapor-deposited aluminum film may be a film made of PEN (polyethylene naphthalate) instead of PET.

(Sealing material shading part)
The sealing material light-shielding portion 71 is a light-absorbing unit that absorbs light or a reflecting unit that reflects light.

The light absorbing means is exemplified by a black paint such as a black pigment. The black paint is used alone or mixed with a resin or the like as a light absorbing means.
Specifically, for example, an epoxy resin containing carbon black, a butyl rubber containing carbon black, or a low melting glass frit containing carbon black (melting point of about 550 ° C.) can be used as the black pigment.
The black pigment may be directly applied to the sealing material, or a thin film coated with the black pigment may be disposed between the transparent conductive film and the sealing material.
As the black pigment, known carbon black such as channel black, furnace black, thermal black, and lamp black can be used as the carbon black carbon black. Further, black pigments such as graphite, iron black, copper / chromium black, copper / iron / manganese black, cobalt / iron / chromium black may be used.

The reflecting means is exemplified by a white paint such as a white pigment. The white paint is used alone or mixed with a resin or the like as a reflecting means.
White paints include white pigments such as rutile titanium oxide, anatase titanium oxide, antimony zinc trioxide, lithopone, lead white, zinc white (zinc oxide), and other epoxy resins, butyl rubber, and low melting point glass frit. Can be used.

(UV cut part)
Although the UV cut part 73 of this embodiment shows the UV cut film (made by Mitsubishi Rayon Co., Ltd.) which prevents an ultraviolet-ray from entering the transparent base material 10, it is not restricted to this.
The UV cut film, for example, cuts approximately 100% of ultraviolet rays having a wavelength of 375 to 380 nm or less and transmits visible light of 410 nm or more to 90% or more, but is not limited thereto.

According to this structure, since the sealing material light-shielding part 71 is provided between the transparent conductive film 20 and the sealing material 60, the sealing material 60 can convert UV light from the transparent substrate 10 side and visible light having a short wavelength. Since it can prevent exposure, the sealing material 60 becomes difficult to deteriorate with sunlight. Therefore, the solar cell module X can ensure sealing performance over a long period of time.
Since the sealing material light-shielding portion 71 is provided between the transparent conductive film 20 and the sealing material 60, visible light reaches the transparent base material 10, the transparent conductive film 20, and the photoelectrode 30. Therefore, the photoelectric conversion efficiency of the solar cell does not decrease.

[Another embodiment 1]
In embodiment mentioned above, when the sealing material light-shielding part 71 which interrupts | blocks the light from the transparent base material 10 side reaching the sealing material 60 between the transparent conductive film 20 and the sealing material 60 is provided. In the solar cell module X, the UV cut portion 73 that prevents ultraviolet rays from entering the transparent substrate 10 on the other surface of the transparent substrate 10 and the side surface of the transparent substrate 10 on the side surface are described. A side light blocking portion 72 that prevents light from entering the transparent base material 10 may be provided (FIG. 2).

  The UV cut unit 73 of the present embodiment has the same configuration as the UV cut unit 73 of the above-described embodiment. Similar to the sealing material light-shielding portion 71, the side light-shielding portion 72 is a light-absorbing means that absorbs light or a reflecting means that reflects light.

  According to this configuration, the UV cut portion 73 and the side light shielding portion 72 can prevent sunlight from entering the transparent base material 10 from the other side and the side surface of the transparent base material 10, so that the sealing material 60 and the light It is possible to prevent the electrode 30 from being exposed to ultraviolet light and visible light having a short wavelength. Therefore, long-term sealing performance can be secured, and the performance of the photoelectrode 30 is difficult to deteriorate.

[Another embodiment 2]
The solar cell module X includes a sealing material light shielding portion 71 that blocks light from the transparent substrate 10 side from reaching the sealing material 60 between the transparent conductive film 20 and the sealing material 60, and , A UV cut portion 73 that prevents ultraviolet light from entering the transparent substrate 10 on the other surface of the transparent substrate 10, and light intrusion from the side surface into the transparent substrate 10 on the side surface of the transparent substrate 10. You may comprise so that the side light-shielding part 72 which blocks | prevents may be provided (FIG. 3).

In this configuration, the sealing material light-shielding portion 71 can prevent the sealing material 60 from being exposed to ultraviolet light from the transparent base material 10 side or visible light having a short wavelength. The side light shielding part 72 can prevent sunlight from entering the transparent base material 10 from the other side and the side surface of the transparent base material 10.
Thereby, it can prevent reliably that the sealing material 60 and the photoelectrode 30 are exposed to ultraviolet rays and visible light with a short wavelength.

[Method for manufacturing solar cell module]
Below, the manufacturing method of the solar cell module X of this invention is demonstrated. The solar cell module X includes a sealing material light shielding part 71, a side light shielding part 72, and a UV cut part 73. 4 to 6 show a case where six unit cells A are formed.

(A) A glass substrate with a transparent conductive film having a transparent conductive film 20 on one surface of the transparent substrate 10 was produced (FIG. 4A).

(B) The scribing process was performed on the transparent conductive film 20 with a YAG laser or a CO ₂ laser (FIG. 4B).

(C) On one surface of the transparent substrate 10, a low melting point glass frit (absorbing means) containing carbon black as a sealing material light-shielding portion 71 is screen-printed on the transparent conductive film 20, and an extraction electrode 80 is disposed. (FIG. 4 (c)). A low melting point glass frit (absorbing means) containing carbon black was roll-coated on the side surface of the transparent substrate 10 as the side light shielding portion 72. After the roll application, the film was dried at 170 ° C. for 15 minutes and then baked at 500 ° C. for 10 minutes.

(D) The photoelectrode 30, the porous carrier 41, and the counter electrode 50 were sequentially laminated on the transparent conductive film 20 by screen printing (FIG. 4D). After printing, it was dried at 170 ° C. for 15 minutes and then baked at 500 ° C. for 10 minutes.

(E) Between each unit cell A, the polyolefin resin sealing material 60 was applied at 180 ° C. by a hot dispenser (FIG. 5E). At this time, the transparent substrate 10 was maintained at 120 ° C. Leveling was performed by promoting fusion at 170 ° C. for 30 minutes.

(F) In order to adsorb the dye to the photoelectrode 30, it was immersed in a dye solution (ruthenium complex solution, ruthenium concentration 0.6 mM) for 24 hours in a container stored at 25 ° C. in the dark (FIG. 5 (f)).

(G) After removing the excess dye, the electrolyte solution was allowed to permeate into each unit cell A while being dropped, so that the electrolyte solution was uniformly held on the porous carrier 41 (FIG. 5G). The electrolytic solution used was prepared by dissolving 0.05 mol / L iodine, 0.05 mol / L lithium iodine and 0.05 mol / L 4-t-butylpyridine in 3-methoxypropionitrile.

(H) After removing the excess electrolyte solution, the back sheet 91 was hot-pressed as the moisture-proof material 90 and fused to the sealing material 60 at 180 ° C. for 30 seconds (FIG. 6 (h)). At this time, the sealing material 60 is sealed to the transparent conductive film 20 so as to cover the photoelectrode 30, the electrolyte layer 40, and the counter electrode 50.

(I) A UV cut film 73 was attached to one surface of the transparent substrate 10. Moreover, the lead wire 81 was attached to the extraction electrode 80, and the moisture-proof rubber 92 was applied to the side surface of the sealing material 60 as the moisture-proof material 90 (FIG. 6 (i)).

(J) The solar cell module X was inserted into the frame 100 to obtain a solar cell panel (FIG. 6 (j)).

  In order to investigate how much harmful ultraviolet light and visible light with a short wavelength are cut when the sealing material light shielding part 71, the side light shielding part 72, and the UV cut part 73 are attached, the following transparent conductive film 20 is provided. The light transmittance (%) of the transparent substrate 10 (a glass substrate with a transparent conductive film) was examined.

In the glass substrate with a transparent conductive film used in Example 2-1, the sealing material light-shielding portion 71 was formed on the entire surface of the transparent conductive film 20. Moreover, the side light-shielding part 72 was formed in the side surface used as the edge part of a glass substrate. Further, a UV cut portion 73 was provided on the surface on the light incident side. As the sealing material light-shielding part 71 and the side light-shielding part 72, low melting point glass containing rutile type titanium oxide (50 wt%) was used, and as the UV cut part 73, a UV cut film (manufactured by Mitsubishi Rayon Co., Ltd.) was used.
In Example 2-2, low-melting glass containing carbon black (10 wt%) was used as the sealing material light-shielding part 71 and the side light-shielding part 72. The UV cut portion 73 was the same as that in Example 2-1.
In Comparative Example 2-1, the transparent base material 10 (glass substrate with a transparent conductive film) having the transparent conductive film 20 in which the sealing material light shielding part 71, the side light shielding part 72, and the UV cut part 73 are not provided was used. .
In Comparative Example 2-2, a glass substrate with a transparent conductive film using a UV cut part 73 similar to that of Example 2-1 on the surface on the light incident side of the glass substrate with a transparent conductive film of Comparative Example 2-1. used.

  The light transmittance (%) was measured using a spectrophotometer V-570 type (manufactured by JASCO Corporation). The results are shown in FIG.

  As a result, in Example 2-1, the transmittance of ultraviolet light at 390 nm was 0.20%, in Example 2-2, the transmittance of ultraviolet light at 390 nm was 0.07%, and in Comparative Example 2-1, transmission of ultraviolet light at 390 nm was performed. The rate was 69.00%. In Comparative Example 2-2, the transmittance of ultraviolet light at 390 nm was 4.69%. From this, in the transparent base material 10 (glass substrate with a transparent conductive film) (Comparative Example 2-2) having the transparent conductive film 20 just pasted with the UV cut film, it is possible to avoid the transmission of about 5% of ultraviolet rays. However, the provision of the sealing material light-shielding part 71 and the side light-shielding part 72 enabled the transmission of ultraviolet rays to be substantially zero.

(Light resistance test)
A light resistance test was performed using the solar cell module X of the present invention.
Example 3-1 is a low-melting-point glass frit (light absorption means) containing carbon black (10 wt%) as the sealing material light shielding portion 71, and an epoxy resin (light absorption) containing carbon black (10 wt%) as the side light shielding portion 72. Means), a UV cut film (manufactured by Mitsubishi Rayon Co., Ltd.) was used as the UV cut part 73.
In addition, application | coating and hardening processing of the side light-shielding part 72 were performed at the process (j) of the said manufacturing method.

  In Example 3-2, a low-melting-point glass frit (absorbing means) containing furnace black was used as the sealing material light-shielding portion 71. The side light-shielding part 72 and the UV cut part 73 were the same as in Example 3-1.

  In Example 3-3, a low-melting glass frit (reflecting means) containing rutile titanium oxide (50 wt%) was used as the sealing material light-shielding portion 71. The side light-shielding part 72 and the UV cut part 73 were the same as in Example 3-1.

  In Example 3-4, a low melting point glass frit (reflecting means) containing zinc white (50 wt%) was used as the sealing material light-shielding portion 71. The side light-shielding part 72 and the UV cut part 73 were the same as in Example 1.

  In Example 3-5, an epoxy resin (light absorption means) containing carbon black (10 wt%) was used as the side light-shielding portion 72. The UV cut part 73 was the same as that of Example 3-1. The epoxy resin was applied in step (j) of the manufacturing method described above.

  In Example 3-6, a low melting point glass frit (absorbing means) containing furnace black (10 wt%) was used as the side light-shielding portion 72. The UV cut part 73 was the same as that of Example 3-1. The low melting point glass frit was applied in step (c) of the manufacturing method described above.

  Comparative Example 3-1 is not provided with any of the sealing material light-shielding part 71, the side light-shielding part 72, and the UV cut part 73, but the other configuration is the same as the solar battery module X of the present invention. It was used.

  The comparative example 3-2 used the solar cell module which used the UV cut film similar to Example 3-1 for the solar cell module of the comparative example 3-1, using the UV cut part 73 as a UV cut film. The UV cut film cuts approximately 95% of ultraviolet rays having a wavelength of 380 nm or less.

The solar cell modules of Examples 3-1 to 3-6 and Comparative Examples 3-1 and 3-2 were irradiated with an ultraviolet intensity of 80 mW / cm ² (Metal Weather (MH lamp) manufactured by Daipura Wintes Co., Ltd.) (black The panel temperature was 80 ° C.), and the time (h) required for the transparent conductive film 20 and the sealing material 60 to peel was examined. The adhesive strength was measured by a 180 degree peel peel test (tensile condition: tensile speed 200 mm / min) using a load cell (manufactured by Shimadzu Corporation), and evaluated with an 80% adhesive strength holding time. The results are shown in Table 1.

この結果、封止材遮光部７１、側方遮光部７２、ＵＶカット部７３を設けることにより、透明導電膜２０と封止材６０とが剥離するまでに要する時間を大幅に遅らせることができた。
特に、実施例３−１〜３−４のように封止材遮光部７１、側方遮光部７２およびＵＶカット部７３を設けることで、従来の比較例２のようにＵＶカットフィルムを設けただけの構成に比べて、３７〜５０倍もの長寿命化が達成できた。
さらに、実施例３−５，３−６のように側方遮光部７２およびＵＶカット部７３を設けることで、比較例３−２の構成に比べて、１２〜２０倍もの長寿命化が達成できた。
実施例３−１，３−２は封止材遮光部７１が吸光手段であり、実施例３−３，３−４は封止材遮光部７１が反射手段であるが、両者の長寿命化の効果は同等であると認められた。

As a result, by providing the sealing material light shielding part 71, the side light shielding part 72, and the UV cut part 73, it was possible to greatly delay the time required for the transparent conductive film 20 and the sealing material 60 to peel off. .
In particular, as in Examples 3-1 to 3-4, by providing the sealing material light shielding part 71, the side light shielding part 72, and the UV cut part 73, a UV cut film was provided as in the conventional comparative example 2. Compared to the configuration of only this, the life could be increased by 37 to 50 times.
Furthermore, by providing the side light-shielding part 72 and the UV cut part 73 as in Examples 3-5 and 3-6, the life of 12 to 20 times as long as that of the configuration of Comparative Example 3-2 is achieved. did it.
In Examples 3-1 and 3-2, the sealing material light-shielding part 71 is a light-absorbing means, and in Examples 3-3 and 3-4, the sealing material light-shielding part 71 is a reflecting means. The effects of were found to be equivalent.

  The present invention has a transparent conductive film on one surface of a transparent substrate, and a photoelectrode, an electrolyte layer, and a counter electrode are sequentially laminated on a part of the transparent conductive film, and the laminated photoelectrode and electrolyte are laminated. It can utilize for the solar cell module provided with the sealing material sealed on a transparent conductive film, covering a layer and a counter electrode, for example, a dye-sensitized solar cell.

X solar cell module 10 transparent base material 20 transparent conductive film 30 photoelectrode 40 electrolyte layer 50 counter electrode 60 sealing material 71 sealing material light shielding part

Claims (6)

A transparent conductive film is provided on one surface of the transparent substrate, and a photoelectrode, an electrolyte layer, and a counter electrode are sequentially stacked on a part of the transparent conductive film, and the stacked photoelectrode and electrolyte layer are stacked. And a sealing material for sealing to the transparent conductive film while covering the counter electrode,
The solar cell module provided with the sealing material light-shielding part which interrupts | blocks the light from the said transparent base material side reaching | attaining the said sealing material between the said transparent conductive film and the said sealing material. A transparent conductive film is provided on one surface of the transparent substrate, and a photoelectrode, an electrolyte layer, and a counter electrode are sequentially stacked on a part of the transparent conductive film, and the stacked photoelectrode and electrolyte layer are stacked. And a sealing material for sealing to the transparent conductive film while covering the counter electrode,
The other surface of the transparent substrate is provided with a UV cut portion that prevents ultraviolet rays from entering the transparent substrate, and light is prevented from entering the transparent substrate from the side surface on the side surface of the transparent substrate. The solar cell module provided with the side light-shielding part.   2. The solar cell module according to claim 1, wherein the sealing material light-shielding portion is a light-absorbing unit that absorbs light or a reflecting unit that reflects light.   The solar cell module according to claim 2, wherein the side light-shielding part is a light absorbing unit that absorbs light or a reflecting unit that reflects light.   The solar cell module according to claim 3 or 4, wherein the light absorbing means is a black paint.   The solar cell module according to claim 3 or 4, wherein the reflecting means is a white paint.

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