JP2007273200A - Dye-sensitized solar cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dye-sensitized solar cell which can be easily formed and can continuously demonstrate an effect of enhabcing durability. <P>SOLUTION: A protective member 1 is made of thermoplastic synthetic resin and formed by thermoforming and can be easily matched to various shapes, and the thermoplastic systhetic resin is mixed with an ultraviolet absorbing agent, so that there is no risk that a part containing the ultraviolet absorbing agent only is deteriorated or peeled off and, therfore, the cell can continuously demonstrate durability due to a reduction effect of an ultraviolet amount. Fig. 1 is given for reference. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dye-sensitized solar cell with improved durability.

  The dye-sensitized solar cell generates power mainly by visible light, and does not contribute to power generation for other wavelengths, but also leads to deterioration of each material constituting the dye-sensitized solar cell. Is. In particular, since ultraviolet rays are highly degraded, a fluorine resin sheet and a resin film having an inorganic oxide vapor-deposited thin film are laminated, and the fluorine resin sheet and an inorganic oxide vapor-deposited thin film. A filler on one side of a surface protection sheet for a solar cell module provided with an antifouling layer and / or an ultraviolet absorber layer on one or both sides of a laminate comprising a resin film having Layer, a solar cell element as a photovoltaic element, a filler layer, and a back surface protection sheet layer are sequentially laminated, and these are vacuum-sucked to form an integrally formed body by a thermocompression lamination method or the like. Thus, a solar cell module is disclosed in which ultraviolet rays are shielded and durability is improved.

JP 2000-208797 A

  However, in the conventional solar cell as described in Patent Document 1, in order to provide the ultraviolet absorber layer, a film containing an ultraviolet absorber is attached or a paint containing an ultraviolet absorber is applied. It was necessary and the work related to formation was complicated. Further, when the ultraviolet absorber layer deteriorates or peels off, the effect of easily increasing the durability is lost.

  The present invention has been made in view of the problems as described above, and is intended to provide a dye-sensitized solar cell in which the work related to formation is simple and the effect of enhancing durability can be continuously exhibited. Is.

  In order to achieve the above object, the present invention is configured as follows. That is, in the dye-sensitized solar cell according to the present invention, a translucent protective member is provided on the light incident side of a photoelectrode layer in which a sensitizing dye is supported on a semiconductor material, and the protective member is a thermoplastic synthetic resin. It is characterized in that it is formed by thermoforming with a UV absorber.

  According to the dye-sensitized solar cell of the present invention, the protective member is easily formed by thermoforming using a thermoplastic synthetic resin, so that it becomes easy to cope with various shapes. Since the ultraviolet absorber is blended in, there is no fear that only the portion containing the ultraviolet absorber is deteriorated or peeled off, and the durability due to the effect of reducing the amount of ultraviolet rays can be continuously exhibited.

  Further, if the protective member is formed by injection molding, at least two layers of an outer layer and an inner layer are formed from the light incident side, and an ultraviolet absorber is blended only in the outer layer, the amount of the ultraviolet absorber to be blended can be reduced. It is preferable because the occurrence of adverse effects on the photoelectrode layer and the electrolyte layer due to bleeding of the ultraviolet absorber can be eliminated.

  According to the dye-sensitized solar cell of the present invention, the protective member is easily formed by thermoforming using a thermoplastic synthetic resin, so that it becomes easy to cope with various shapes. Since the ultraviolet absorber is blended in, there is no fear that only the portion containing the ultraviolet absorber is deteriorated or peeled off, and the durability due to the effect of reducing the amount of ultraviolet rays can be continuously exhibited.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment according to the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a dye-sensitized solar cell according to the present invention, exaggerating the thickness in one embodiment. The dye-sensitized solar cell 10 is provided with a translucent protective member 1 on the light incident side α from the photoelectrode layer 2 in which a sensitizing dye is supported on a porous semiconductor material. A conductive coating 31 made of ITO (tin-doped indium oxide) is provided between the protective member 1 and the photoelectrode layer 2, and the conductive coating 31 made of carbon similarly provided on the counter substrate 33 and the photoelectrode layer 1. Between the two, an electrolyte layer 32 that is an aqueous iodine solution is provided.

  Here, the protective member 1 has an ultraviolet absorbing function by blending a transparent thermoplastic synthetic resin with an ultraviolet absorber and injection molding. The light incident from the light incident side α passes through the protective member 1 and the conductive coating 31 and enters the photoelectrode layer 2, and the protective member 1 is mixed with an ultraviolet absorber, so that the protective member The light incident below the conductive film 31 on the one side has a reduced amount of ultraviolet rays, and the adverse effects of these ultraviolet rays on these members can be reduced. Moreover, since the ultraviolet absorber is blended into the protective member 1 and thermoformed, the ultraviolet absorber is kneaded into the thermoplastic synthetic resin material, and the surface of the protective member 1 is deteriorated or rained. The ultraviolet absorber does not fall off due to external conditions such as the above, and the amount of ultraviolet rays can be reduced over a long period of time.

  FIG. 2 is a longitudinal sectional view exaggerating the thickness showing another embodiment of the dye-sensitized solar cell according to the present invention. The protective member 1 is formed by two-layer injection molding of the outer layer 11 and the inner layer 12 from the light incident side α, and in this embodiment, only the outer layer 11 is blended with an ultraviolet absorber. Since the ultraviolet absorber is blended only in the outer layer 11, the amount of the thermoplastic synthetic resin to be blended with the ultraviolet absorber can be reduced, the amount of the ultraviolet absorber can be reduced, and the same amount of ultraviolet absorption can be achieved. Even when an agent is blended, the presence density of the ultraviolet absorber is increased, so that the risk of ultraviolet rays being transmitted between the particles of the ultraviolet absorber can be reduced and the effect of reducing ultraviolet rays can be further enhanced. Further, since the outer layer 11 and the inner layer 12 are integrally formed, there is no possibility that the outer layer 11 is peeled off, and the effect of reducing the amount of ultraviolet rays can be maintained over a long period of time.

  As the ultraviolet absorber to be blended in the protective member 1, those that can absorb ultraviolet rays can be appropriately selected and blended, but in order not to reduce the power generation efficiency of the dye-sensitized solar cell 10. It is preferable to select a material that does not interfere with the translucency of the protective member 1. For example, when salicylic acid-based material, benzophenone-based material, benzotriazole-based material, cyanoacrylate-based material, or the like is blended and thermoformed In addition, those having a small degree of lowering the light transmittance can be suitably used.

  The protective member 1 is not particularly limited as long as it is translucent and can be thermoformed such as injection molding, but is not limited to polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polymethacrylate, acrylic resin, polychlorinated. A light-transmitting thermoplastic synthetic resin such as vinyl or ABS can be used, but a cyclic polyolefin resin having high resistance to an iodine solution or the like forming the electrolyte layer 4 can be most preferably used. Moreover, the optimal combination which exhibits the translucency and the reduction effect of an ultraviolet-ray quantity mix | blends the benzotriazole type thing as a ultraviolet absorber in cyclic polyolefin type resin.

  As a compounding quantity of the ultraviolet absorber with respect to the thermoplastic synthetic resin which forms the protection member 1, it is preferable to mix | blend about 0.1-3 weight part with respect to 100 weight part of thermoplastic synthetic resins, More preferably, it is 0.3. -0.5 parts by weight. If the transmittance of light having a wavelength of 400 nm or less can be reduced to 10% or less by blending such an ultraviolet absorber, the adverse effects on the members as described above can be effectively reduced.

  FIG. 3 is a perspective view showing an example of a protective member forming the dye-sensitized solar cell according to the present invention. The protective member 1 is formed with an electrode portion 13 protruding from the outer edge, and a convex portion 15 and a concave portion 16 provided around the corner portion 14, and the two protective members 1 are overlapped with each other. In this case, the concave portion 16 is fitted into the convex portion 15. Even the protective member 1 having such a complicated shape can be easily molded by thermoforming such as injection molding as shown in the above-described embodiment, and has an effect of reducing the amount of ultraviolet rays. This can be done very easily.

  The effect of reducing the amount of ultraviolet rays of the dye-sensitized solar cell according to the present invention will be described with reference to the following examples.

Example 1
0.5 parts by weight of an ultraviolet absorber (benzophenone-based ultraviolet absorber) is blended with 100 parts by weight of a cyclic polyolefin resin (“Apel (registered trademark)” manufactured by Mitsubishi Chemical Corporation), and the present invention has a thickness of 2.0 mm. The protection member used for the dye-sensitized solar cell of Example 1 concerned was obtained.

(Example 2)
Two-layer molding is performed using a cyclic polyolefin-based resin (“Apel (registered trademark)” manufactured by Mitsubishi Chemical Corporation), the inner layer is only the cyclic polyolefin-based resin, and the outer layer is an ultraviolet absorber (100 parts by weight with respect to the cyclic polyolefin-based resin). Benzophenone-based UV absorber) 0.5 parts by weight, protection for the dye-sensitized solar cell of Example 2 according to the present invention having an outer layer of 0.5 mm and an inner layer of 1.5 mm and a total thickness of 2.0 mm A member was obtained.

(Comparative Example 1)
A protective member used for the dye-sensitized solar cell of Comparative Example 1 having a thickness of 2.0 mm was obtained using only a cyclic polyolefin-based resin (“Apel (registered trademark)” manufactured by Mitsubishi Chemical Corporation).

  When the transmittance of light having wavelengths of 350 nm, 400 nm, and 450 nm of the protective members used in the dye-sensitized solar cells of these Examples and Comparative Examples was measured, Example 1 was 0.02%, 0.1% % And 83%, Example 2 was 0.2%, 1.8% and 86%, Comparative Example 1 was 63%, 85% and 89%, and the Examples showed a remarkable effect of reducing the amount of ultraviolet rays. It is also shown that it has excellent visible light transmission.

It is a longitudinal cross-sectional view in one Embodiment of the dye-sensitized solar cell concerning this invention. It is a longitudinal cross-sectional view in other embodiment of the dye-sensitized solar cell concerning this invention. It is a perspective view which shows an example of the protection member of the dye-sensitized solar cell concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Protective member 2 Photoelectrode layer 10 Dye-sensitized solar cell α Light incident side

Claims (2)

A light-transmitting protective member is provided on the light incident side of the photoelectrode layer in which a sensitizing dye is supported on a semiconductor material, and the protective member is formed by blending a thermoplastic synthetic resin with an ultraviolet absorber and thermoforming. A dye-sensitized solar cell, characterized by The dye-sensitized dye according to claim 1, wherein the protective member is formed by injection molding at least two layers of an outer layer and an inner layer from the light incident side, and an ultraviolet absorber is blended only in the outer layer. Solar cell.

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