JP4936648B2 - Dye-sensitized solar cell and method of attaching dye-sensitized solar cell - Google Patents

Description

  The present invention relates to a dye-sensitized solar cell and a method for attaching a dye-sensitized solar cell.

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

  In order to improve the power generation efficiency, the silicon solar cell has a structure in which incident light contributing to power generation is taken into the inside without losing as much as possible. For this reason, in general, the surface reflection of incident light is suppressed by providing a concave-convex structure made of a continuous slope on the surface of the silicon solar cell, or by covering the surface with an antireflection film. Therefore, the surface of the silicon solar cell is recognized as a dark single color from blue to purple.

On the other hand, for example, the dye-sensitized solar cell disclosed in Patent Document 1 includes a photoelectrode (working electrode) having a titanium dioxide porous thin film containing a ruthenium complex dye as a metal complex dye (sensitizing dye). The color of the sensitizing dye is recognized. Examples of the metal complex dye include ruthenium (Ru ³⁺ ion, Ru ²⁺ ion) as a coordination center, thiocyanate ion, 1,10-phenanthroline, 1,10-phenanthroline derivative, 2,2′-bipyridyl, and 2, Known isothiocyanate complexes, thiocyanate complexes, porphyrin-based dyes, phthalocyanine-based dyes, and the like having a 2′-bipyridyl derivative as a ligand.
In addition to metal complex dyes, organic dyes are used as sensitizing dyes. Examples include xanthene dyes, cyanine dyes, merocyanine dyes, phenylxanthene dyes, triphenylmethane dyes, and rhodacyanine dyes. It has been.
Therefore, the dye-sensitized solar cell can be given various colors according to the sensitizing dye.

US Pat. No. 4,927,721

  Since the above-described silicon solar cell is recognized as a dark single color, it does not have a visual feature. For this reason, there is a problem that the installation location for a building structure such as a building or a house is limited to the roof or the roof because of the poor appearance.

  On the other hand, the dye-sensitized solar cell has a higher degree of freedom in color by changing the color of the sensitizing dye, and thus has a higher visual added value than the silicon solar cell. However, there is a problem that the design properties such as the texture and design are not sufficient simply by changing the color.

  Accordingly, an object of the present invention is to provide a dye-sensitized solar cell that has high visual added value and is excellent in design.

In order to achieve the above object, a first characteristic configuration of a dye-sensitized solar cell according to the present invention includes a light-receiving surface and a semiconductor electrode containing a dye and a transparent electrode disposed adjacent to the light-receiving surface. A dye-sensitized solar cell main body having a photoelectrode and a counter electrode disposed opposite to the semiconductor electrode via an electrolyte; and a reflecting means for reflecting light transmitted through the dye-sensitized solar cell main body. The dye-sensitized solar cell main body and the reflecting means are spaced apart from each other by a predetermined distance, and the reflecting means is disposed on the counter electrode side with respect to the dye-sensitized solar cell main body, The sensitized solar cell body is attached to the reflecting means so that the mounting angle can be changed, and the light incident from the light receiving surface and transmitted through the dye-sensitized solar cell body is reflected by the reflecting means. The light Incident from the counter electrode side of the mold solar cell body in that it passes through the dye-sensitized solar cell body.

In this way, when light enters the dye-sensitized solar cell of the present invention having a reflecting means for reflecting the light transmitted through the dye-sensitized solar cell body and passes through the dye-sensitized solar cell body, the transmitted light Is reflected by the reflecting means and emitted to the light incident side. As a result, the hue of the dye-sensitized solar cell body itself changes, for example, by increasing lightness or saturation.
In addition, since the pattern on the surface of the reflecting means that has received the light transmitted through the dye-sensitized solar cell body is recognized on the light incident side, for example, by applying a pattern on the surface of the reflecting means, a desired pattern can be obtained. The dye-sensitized solar cell is excellent in design such as texture and design.
Therefore, the dye-sensitized solar cell described in the first characteristic configuration of the present invention is a dye-sensitized solar cell with improved visual added value and excellent design. Therefore, even if it is installed on a wall of a building structure that is easily visible, it is a dye-sensitized solar cell with excellent design, so the installation position is not limited and the degree of freedom in installation is increased. Is possible.

  Furthermore, in comparison with a dye-sensitized solar cell in which only a sensitizing dye is sensitive to incident light and used for photovoltaic power generation, light is reflected back and forth within the main body of the dye-sensitized solar cell by reflecting the light with a reflecting means. That is, since the sensitizing dye can react with incident light and reflected light and can be used for photovoltaic power generation, the photoelectric conversion efficiency is improved.

The predetermined distance may be a distance that allows the light transmitted through the dye-sensitized solar cell body and reflected by the reflecting means to be sufficiently emitted to the light incident side. At this time, it is possible to reliably recognize the pattern or the like attached to the reflecting means surface.
Also, the reflection means is disposed on the side opposite to the dye-sensitized solar cell body, and the dye-sensitized solar cell body is attached to the reflection means so that the mounting angle can be changed. The solar cell reflection angle can be adjusted outdoors so that the observer of the solar cell can preferably recognize the pattern attached to the reflecting means of the dye-sensitized solar cell.
Furthermore, with this configuration, after entering from the light-receiving surface, the light transmitted through the dye-sensitized solar cell body and reflected by the structure is the counter electrode side of the dye-sensitized solar cell body, that is, dye-sensitized. It can arrange | position so that it may re-enter into a dye-sensitized solar cell main body from the back surface of a type | mold solar cell main body, and permeate | transmits a dye-sensitized solar cell main body. At this time, since the pattern or the like attached to the surface of the reflecting means can be reliably recognized, the visual added value can be increased.

The 2nd characteristic structure of the dye-sensitized solar cell which concerns on this invention exists in the point in which the said reflection means has the unevenness | corrugation which forms a pattern in the surface at the side of the said dye-sensitized solar cell main body.
Therefore, in the dye-sensitized solar cell described in the second characteristic configuration of the present invention, the light transmitted through the dye-sensitized solar cell body and reflected by the reflecting means, and emitted to the light incident side. Is recognized as a three-dimensional pattern.

A third characteristic configuration of the dye-sensitized solar cell according to the present invention is that the reflecting means has a geometric pattern on the surface of the dye-sensitized solar cell main body.
Therefore, in the dye-sensitized solar cell according to the third characteristic configuration of the present invention, if the geometric pattern is, for example, a lattice pattern, a decorative tile-like texture can be imparted, so that a visual added value is obtained. As a result, the dye-sensitized solar cell is improved in design.

The 4th characteristic structure of the dye-sensitized solar cell which concerns on this invention exists in the point to which the said reflection means is attached so that a relative position with respect to the said dye-sensitized solar cell main body can be changed.
Here, the phrase “relative position can be changed” indicates that the mounting angle, mounting position, mounting direction, and the like between the reflecting means and the dye-sensitized solar cell body can be changed.
Therefore, in the dye-sensitized solar cell described in the fourth feature configuration of the present invention, the attachment state between the reflecting means and the dye-sensitized solar cell body can be variously changed. Can be adjusted to any angle. Therefore, a variety of visual effects can be given to the observer.

According to a fifth characteristic configuration of the dye-sensitized solar cell according to the present invention, the reflecting means is provided separately from the dye-sensitized solar cell main body, the dye-sensitized solar cell main body is rotated, and the dye is rotated. This is in that the relative position with respect to the sensitized solar cell body can be changed.
In this configuration, as the incident direction of light changes, the visual effect can be changed by rotating the dye-sensitized solar cell body and changing the mounting direction of the dye-sensitized solar cell body and the reflecting means. it can.

The method of attaching the dye-sensitized solar cell of the present invention includes a photoelectrode having a light-receiving surface and a semiconductor electrode containing a dye and a transparent electrode adjacently disposed on the light-receiving surface, and the electrolyte through the electrolyte. When attaching a dye-sensitized solar cell body having a counter electrode facing a semiconductor electrode to a structure that is a wall surface and has light reflectivity, the dye-sensitized solar cell body and the structure are predetermined. The structure is arranged so as to be separated by a distance, and the structure is disposed so as to be on the side of the counter electrode with respect to the dye-sensitized solar cell body, and the attachment angle of the dye-sensitized solar cell body with respect to the structure The light incident on the light receiving surface and transmitted through the dye-sensitized solar cell body is reflected by the structure, and the reflected light is reflected by the counter electrode of the dye-sensitized solar cell body. Before entering from the side It lies in mounting so as to transmit a dye-sensitized solar cell body.

Therefore, according to the method for mounting the dye-sensitized solar cell of the present invention, the light transmitted through the dye-sensitized solar cell after being incident from the light receiving surface and reflected by the structure is the dye-sensitized solar cell main body. The dye-sensitized solar cell body can be re-incident from the counter electrode side, that is, the back surface of the dye-sensitized solar cell body, and can pass through the dye-sensitized solar cell body.
In addition, by disposing the structure on the side opposite to the dye-sensitized solar cell body and attaching the dye-sensitized solar cell body to the structure so that the mounting angle can be changed, the dye-sensitized type The solar cell reflection angle can be adjusted outdoors so that the observer of the solar cell can preferably recognize the pattern attached to the structure of the dye-sensitized solar cell.
The predetermined distance may be a distance that allows the light that has passed through the dye-sensitized solar cell body and reflected by the light-reflecting structure to be sufficiently emitted to the light incident side. At this time, since the pattern or the like attached to the surface of the structure can be reliably recognized, the visual added value can be increased. Accordingly, since the dye-sensitized solar cell can be attached to the structure without obscuring the pattern attached to the surface of the structure, the attachment method increases the degree of freedom in installing the dye-sensitized solar cell.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the dye-sensitized solar cell X of the present invention has a light receiving surface F2 and a light having a semiconductor electrode 11 containing a dye and a transparent electrode 12 disposed adjacently on the light receiving surface F2. The main body of the dye-sensitized solar cell having the electrode 10 and the counter electrode 30 disposed opposite to the semiconductor electrode 11 with the electrolyte 20 interposed therebetween, and further having the photoelectrode 10 and the counter electrode 30 formed on the transparent substrate 50 A and reflecting means B for reflecting the light transmitted through the dye-sensitized solar cell main body A. Each configuration will be described in detail below.

(Dye-sensitized solar cell body A)
The photoelectrode 10 includes a semiconductor electrode 11 having a light receiving surface F2 and a transparent electrode 12 disposed adjacent to the light receiving surface F2 of the semiconductor electrode 11. The semiconductor electrode 11 is in contact with the electrolyte 20 on the back surface F22 opposite to the light receiving surface F2.

The semiconductor electrode 11 is composed of an oxide semiconductor layer containing oxide semiconductor particles as a constituent material. The oxide semiconductor particle contained in the semiconductor electrode 11 is not specifically limited, A well-known oxide semiconductor etc. 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. be able to. Among these oxide semiconductors, anatase TiO ₂ is preferable.

  The sensitizing dye contained in the semiconductor electrode 11 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 emits electrons when excited with light having a wavelength of at least 200 nm to 10 μm. 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.

  The structure of the transparent electrode 12 is not specifically limited, The transparent electrode mounted in a normal dye-sensitized solar cell can be used. For example, a configuration in which the film-like transparent electrode 12 is coated on the semiconductor electrode 11 side of the transparent substrate 50 such as a glass substrate is preferably exemplified.

As this film-like transparent electrode 12, 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.

  As the transparent substrate 50, a transparent substrate used for a liquid crystal panel or the like is applicable. Specifically, materials that transmit light, such as a transparent glass substrate and a ground glass-like translucent glass substrate, are exemplified as the transparent substrate material. 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, and the like can be applied.

  In the dye-sensitized solar cell body A, the sensitizing dye adsorbed in the semiconductor electrode 11 is excited by the light L that is transmitted through the transparent substrate 50 and the transparent electrode 12 and is irradiated on the semiconductor electrode 11. Electrons are injected from the sensitizing dye into the semiconductor electrode 11. The electrons injected in the semiconductor electrode 11 are collected on the transparent electrode 12 and taken out to the outside.

The electrolyte 20 is filled in a space formed between the photoelectrode 10 and the counter electrode 30 by the spacer 40. For example, an electrolytic solution is preferably exemplified.
The electrolyte 20 is not particularly limited as long as it contains a redox species for reducing the dye after being photoexcited and injecting electrons into the semiconductor electrode 11. For example, in addition to the above-described electrolytic solution, the electrolyte 20 is known as an electrolytic solution. It is possible to obtain a gel electrolyte obtained by adding a gelling agent (polymer or low molecular weight gelling agent).

  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 dielectric constant, and 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 20 include sensitizing dyes contained in the semiconductor electrode 11 and redox couples that can exchange electrons with the counter electrode 30 (for example, I ₃ ⁻ / I ⁻ system electrolytes, Br ₃ ⁻ / Br). ^- based electrolyte hydroquinone / redox electrolyte such as quinone-based electrolyte) and the, include compounds having an effect of promoting the transfer of the electron, they may be contained 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.

The counter electrode 30 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. For example, you may have the same structure as the counter electrode normally used for a silicon solar cell, a liquid crystal panel, etc., or the same structure as the above-mentioned transparent electrode 12. For example, it is preferable to form a metal thin film electrode such as Pt as the counter electrode 30 on the electrolyte 20 side of the transparent substrate 50 such as a glass substrate. In addition to the metal thin film electrode, a conductive film such as carbon may be used.

(Reflection means B)
For example, the reflection means B is preferably a metal plate having a high total reflectivity with respect to received light, but is not limited thereto, and is a resin, glass, metal or the like plated with a metal having a high total reflectivity. It may be. The reflecting means B is preferably disposed on the transparent substrate 50 side on which the counter electrode 30 is formed, but is not limited thereto, and can be disposed on the transparent substrate 50 side on which the photoelectrode 10 is formed. is there.

Thus, the light L is incident on the dye-sensitized solar cell X of the present invention having the reflection means B for reflecting the light transmitted through the dye-sensitized solar cell main body A, and is transmitted through the dye-sensitized solar cell main body A. Then, the transmitted light L is reflected by the reflecting means B and emitted to the incident side of the light L. As a result, the hue of the dye-sensitized solar cell body A itself changes, for example, by increasing the brightness and saturation.
Moreover, since the pattern of the surface of the reflection means B which received the light which permeate | transmitted the dye-sensitized solar cell main body A is recognized by the incident side of light, for example, by giving a pattern to the surface of the reflection means B, The dye-sensitized solar cell X can recognize a desired pattern.
Therefore, the dye-sensitized solar cell X is improved in visual added value and excellent in design.

  Furthermore, compared with the dye-sensitized solar cell in which only the incident light is sensitized by the sensitizing dye and used for photovoltaic power generation, the light is reflected by the reflecting means B, thereby reciprocating in the dye-sensitized solar cell main body A. The light, that is, incident light and reflected light can be used by the sensitizing dye and can be utilized for photovoltaic power generation, so that the photoelectric conversion efficiency is improved.

The reflection means B can be configured to have irregularities that form a pattern on the surface of the dye-sensitized solar cell main body A side.
As for the unevenness | corrugation attached | subjected to the surface by the side of the dye-sensitized solar cell main body A, although an embossing process is illustrated suitably, for example, it is not restricted to this. In addition, various known modes such as etching and drilling can be applied.

As a result, the light transmitted through the dye-sensitized solar cell main body A and reflected by the reflecting means B and emitted to the light incident side is recognized as a three-dimensional pattern.
For example, when the reflection means B is locally patterned to change the reflectance of the reflection means B, the dye-sensitized solar cell X having excellent design properties such as texture and design is obtained.

  The pattern given to the surface of the reflecting means B on the dye-sensitized solar cell main body A side can be variously changed according to the wavelength and angle of the light to be reflected. For example, it can be a marble pattern or a high-grade tile pattern, and can be further provided with a pattern such as a melon base, a pyramid-like texture, a slotted eye, an oblique lattice, a houndstooth lattice, a lattice, a wave, or a line (FIG. 2). (See (a) to (i)).

  The reflection means B can be attached so that the relative position with respect to the dye-sensitized solar cell body A can be changed. Here, the phrase “relative position can be changed” indicates that the mounting angle, mounting position, mounting direction, and the like of the reflecting means B and the dye-sensitized solar cell main body A can be changed.

For example, the observer of the dye-sensitized solar cell X can adjust the angle of attachment between the reflecting means B and the dye-sensitized solar cell body A in advance so that the observer of the dye-sensitized solar cell X can reflect the reflecting means B of the dye-sensitized solar cell X. The reflection angle of sunlight can be adjusted outdoors so that the pattern attached to can be preferably recognized.
Furthermore, the visual effect is changed by changing the mounting direction of the dye-sensitized solar cell body X and the reflecting means B by rotating the dye-sensitized solar cell body A or the like in accordance with the change in the incident direction of light. be able to.
Therefore, a variety of visual effects can be given to the observer.

  The dye-sensitized solar cell main body A and the reflecting means may be either in a contact arrangement or in a form separated by a predetermined distance. The predetermined distance is preferably a distance that allows the light transmitted through the dye-sensitized solar cell body A and reflected by the reflecting means B to be sufficiently emitted to the light incident side. At this time, the pattern etc. which were attached | subjected to the reflection means B surface can be recognized reliably.

Specific examples of the dye-sensitized solar cell X of the present invention described above are shown below.
_Two glass substrates 50 coated with fluorine-doped tin oxide (SnO ₂ ) as the transparent electrode 12 were produced.
The semiconductor electrode 11 having titanium oxide (TiO ₂ ) fine particles having an average particle diameter of about 10 nm as a constituent material was pasted and screen-printed on one fluorine-doped SnO ₂ -coated glass substrate 50. After baking at 450 ° C., the thickness of the semiconductor electrode 11 was adjusted to about 5 μm. Then, a ruthenium complex (cis-dicyanate-N, N′-bis (2,2′-bipyridyl-4,4′-dicarboxylate) ruthenium (II)) is used as a sensitizing dye in a nitrile solvent at a predetermined concentration. Dissolved and adsorbed at room temperature for 24 hours.

Pt fine particles having a particle diameter of about 20 nm were adhered to the other fluorine-doped SnO ₂ coated glass substrate 50 with an ionomer-based adhesive, and this was used as the counter electrode 30.

As an oxidation-reduction pair, an electrolytic solution 20 containing iodide ions (I ₃ ⁻ / I ⁻ etc.) as a solute and methoxypropionitrile (MPN) as a solvent was used.

  The dye-sensitized solar cell body A thus configured had a thickness of 6 mm, and the visible light transmittance was 13.9% at 600 nm and 50.3% at 700 nm. Moreover, the photoelectric conversion efficiency of the dye-sensitized solar cell body A was 4.1%.

Reflecting means B was attached to the back surface of the dye-sensitized solar cell body A (on the transparent substrate 50 side on which the counter electrode 30 was formed) to obtain a dye-sensitized solar cell X of the present invention. Here, the back surface is a side through which light incident on the dye-sensitized solar cell main body A is transmitted.
The reflection means B embossed the surface of the aluminum plate into a slotted pattern (see FIG. 2C). The slotted pattern has, for example, an irregularly arranged circular structure with a diameter of about 10 mm and a height of about 1 mm. Then, alumite treatment was performed, and nickel plating was further performed to increase the reflectance. The total reflectance of the reflection means B configured as described above was 75% in the visible light region.

Here, a 500 W xenon lamp with an AM 1.5 filter was irradiated to the dye-sensitized solar cell body A and the dye-sensitized solar cell X of the present invention under the condition of 20 mW / cm ² . The irradiation method was performed so as to gradually become a vertical direction from an oblique direction.
In the dye-sensitized solar cell main body A in which the reflection means B is not provided, the colors of the sensitizing dye and the electrolytic solution 20 are combined to exhibit an orange to brown color.
On the other hand, in the dye-sensitized solar cell X provided with the reflection means B, the irregularly arranged dorsal pattern irregularly reflected the incident light, and the red brightness and saturation of the ruthenium complex were improved. Furthermore, despite the fact that the surface is composed of a flat glass substrate, the slotted pattern was recognized three-dimensionally and presented a marble-like texture.

In the reflection means B described in Example 1, the same pattern as that of the dye-sensitized solar cell X described in Example 1 is used except that the pattern on the surface of the aluminum plate is a pyramidal texture (see FIG. 2B). The configuration. The pyramidal texture structure has a regularly arranged structure with a bottom area of 1 mm ² and a height of about 1 mm, for example.

  The dye-sensitized solar cell body A and the dye-sensitized solar cell X of the present invention were irradiated with a xenon lamp under the conditions described in Example 1.

In the dye-sensitized solar cell main body A in which the reflection means B is not provided, the colors of the sensitizing dye and the electrolytic solution 20 are combined to exhibit an orange to brown color.
On the other hand, in the dye-sensitized solar cell X provided with the reflection means B, the incident light is strongly reflected at a constant period, and the gloss of the jewel is exhibited at the top of the texture, and the pyramidal texture structure is recognized three-dimensionally. It was. Furthermore, in the flat part without the pyramid-like texture structure, the incident light was reflected and the brightness was improved.

  From Examples 1 and 2, by designing the pattern and reflectivity of the reflecting means B so as to reflect in a desired direction at the position of sunlight or light source set in advance, it has a basic function of a solar cell, and Since it is possible to produce light by reflected light, it is expected that the dye-sensitized solar cell X is improved in visual added value and excellent in design.

  In the reflection means B described in Example 1, the surface of the aluminum plate was not embossed, anodized and nickel-plated, and the geometric pattern was printed by screen printing. It was set as the structure similar to the dye-sensitized solar cell X of description. Examples of the geometric pattern include a lattice pattern.

  The dye-sensitized solar cell body A and the dye-sensitized solar cell X of the present invention were irradiated with a xenon lamp under the conditions described in Example 1.

In the dye-sensitized solar cell main body A in which the reflection means B is not provided, the colors of the sensitizing dye and the electrolytic solution 20 are combined to exhibit an orange to brown color.
On the other hand, in the dye-sensitized solar cell X provided with the reflection means B, the lightness and saturation of red are improved, and the screen-printed pattern is recognized three-dimensionally and exhibits a decorative tile-like texture.
As a result, the reflection means B not only has a concavo-convex structure on the surface, but also improves the visual added value in a planar pattern on which a pattern is printed, resulting in a dye-sensitized solar cell X that is excellent in design. It is expected.

For the dye-sensitized solar cell X described in Example 3, 500 W with AM 1.5 filter
A xenon lamp was vertically irradiated under the condition of 100 mW / cm ² to measure the photoelectric conversion efficiency. The photoelectric conversion efficiency was measured by a conventional method.

In the dye-sensitized solar cell main body A in which the reflection means B is not provided, the photoelectric conversion efficiency is 4.1%, whereas in the dye-sensitized solar cell X in which the reflection means B is provided, the photoelectric conversion is performed. Efficiency is 4.3
%Met. Therefore, an improvement in photoelectric conversion efficiency of about 5% was recognized.
It is considered that this is because the photoelectric conversion efficiency is improved because the reciprocating light can be used for power generation in the dye-sensitized solar cell body A by reflecting the light with the reflecting means B.

In order to lengthen the optical path, a certain amount of scattering particles whose particle diameter of the photoelectrode was controlled were included, and the particle diameter and film thickness of the transparent electrode and the like were controlled. It was detrimental. However, when the reflecting means B is provided as in the present invention, the photoelectric conversion efficiency can be improved without a complicated process of controlling the particle diameter and film thickness of each electrode.
[Another embodiment]

It is possible to attach the dye-sensitized solar cell main body A described above to a structure having light reflectivity. The structure is preferably exemplified by a house, a building, an advertising tower, and the like, and examples of the mounting surface include an outer wall surface of the building, an indoor wall surface, and a roof of a house.
That is, instead of the reflection means B described in the first to fourth embodiments, the light transmitted through the dye-sensitized solar cell main body A is reflected by a structure having light reflectivity and emitted to the light incident side. Configure as follows.

For example, the dye-sensitized solar cell body A is attached to the wall surface of a building in which white tiles having light reflectivity are arranged on the wall surface. At this time, the predetermined distance for separating the dye-sensitized solar cell main body A and the structure was 100 mm.
If comprised in this way, the transmitted light which sunlight injected into the dye-sensitized solar cell main body A will be reflected by the white tile of a building, and will radiate | emit to the incident side of light. At this time, the emitted light was red with high brightness and saturation.

  That is, by attaching the dye-sensitized solar cell body A to a structure having light reflectivity, the light transmitted through the dye-sensitized solar cell body A and reflected by the structure is emitted to the light incident side. Thus, the dye-sensitized solar cell main body A can be disposed. Therefore, even if a pattern is added to the white tile, this pattern can be reliably recognized. The predetermined distance is preferably smaller, and is 100 mm or less, more preferably 10 mm, 5 mm, 2 mm or less.

Schematic of the dye-sensitized solar cell of the present invention The figure which showed the example of the pattern given to a reflection means

X Dye-sensitized solar cell A Dye-sensitized solar cell body B Reflecting means F2 Light-receiving surface 10 Photoelectrode 11 Semiconductor electrode 12 Transparent electrode 20 Electrolyte 30 Counter electrode

Claims (6)

A dye electrode sensitized having a photoelectrode having a semiconductor electrode having a light receiving surface and containing a dye and a transparent electrode adjacently disposed on the light receiving surface, and a counter electrode disposed opposite to the semiconductor electrode via an electrolyte A solar cell body, and reflecting means for reflecting the light transmitted through the dye-sensitized solar cell body,
The dye-sensitized solar cell body and the reflecting means Ri Thea and spaced by a predetermined distance,
The reflecting means is disposed on the counter electrode side with respect to the dye-sensitized solar cell main body, and the dye-sensitized solar cell main body is attached to the reflecting means so that the mounting angle can be changed,
Light incident from the light receiving surface and transmitted through the dye-sensitized solar cell body is reflected by the reflecting means, and the reflected light enters from the counter electrode side of the dye-sensitized solar cell body and dye-sensitized solar cells you pass through the dye-sensitized solar cell body.   2. The dye-sensitized solar cell according to claim 1, wherein the reflecting means has unevenness forming a pattern on the surface of the dye-sensitized solar cell main body side.   The dye-sensitized solar cell according to claim 1, wherein the reflecting means has a geometric pattern on the surface of the dye-sensitized solar cell main body.   The dye-sensitized solar cell according to any one of claims 1 to 3, wherein the reflecting means is attached so that a relative position with respect to the dye-sensitized solar cell main body can be changed. It said reflecting means, the dye-sensitized solar cell body and provided separately, rotates the dye-sensitized solar cell body, mounted for changing the relative position with respect to the dye-sensitized solar cell body according Item 5. The dye-sensitized solar cell according to Item 4 . A dye electrode sensitized having a photoelectrode having a semiconductor electrode having a light receiving surface and containing a dye and a transparent electrode adjacently disposed on the light receiving surface, and a counter electrode disposed opposite to the semiconductor electrode via an electrolyte When attaching the solar cell body to the indoor wall surface and light reflecting structure,
The dye-sensitized solar cell body and the structure are spaced apart by a predetermined distance,
The structure is disposed on the counter electrode side with respect to the dye-sensitized solar cell body,
Attaching the dye-sensitized solar cell body to the structure so that the attachment angle can be changed,
The light incident from the light receiving surface and transmitted through the dye-sensitized solar cell body is reflected by the structure, and the reflected light is incident from the counter electrode side of the dye-sensitized solar cell body and A method of attaching a dye-sensitized solar cell body that is attached so as to pass through the dye-sensitized solar cell body.

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