JP2004273223A - Dye-sensitized solar cell module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dye-sensitized solar cell module of which installation area is small, and a photoelectric conversion efficiency per projected area can be improved. <P>SOLUTION: One of the dye-sensitized solar cells (1), and one of reflecting mirrors (2) are adjacently arranged in a pair, and each one is tilted at the same angle θ against a module support substrate (13) so as to face each other. The angle θ is preferably 10 to 80°, and more preferably 45 to 80°. As for a cathode electrode of the dye-sensitized solar cells (1), it is preferable that a first transparent conductive film is formed at the inner side of a transparent substrate, and on the surface of the transparent conductive film, platinum particulates or carbon particulates are adhered, and as for an anode electrode, it is preferable that a second transparent conductive thin film and a metal oxide thin film are sequentially formed at the inner side of a second transparent substrate, and that pigments are carried on the surface of the metal oxide film. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dye-sensitized solar cell module.
[0002]
[Prior art]
In recent years, in response to global environmental problems, clean energy has been demanded, solar cells have been developed, and their use has been increasing. Among solar cells, dye-sensitized solar cells have attracted attention because they can be manufactured at low cost.
[0003]
The structure of a conventional dye-sensitized solar cell will be described with reference to FIG.
[0004]
In a conventional dye-sensitized solar cell, a transparent conductive film (5a) is coated on the inside of a glass substrate (4a), and a metal oxide porous film (6) is formed thereon. The dye (10) is adsorbed on the surface of the metal oxide fine particles (9) constituting the film (6), and between the glass substrate (4b) coated with another transparent conductive film (5b), It has a sandwich structure in which the electrolyte (7) is sealed. The metal oxide fine particles (9) such as titanium oxide used absorb only short-wavelength light, and thus the dye (10) is used as a sensitizer to efficiently convert sunlight into electricity. . The dye (10) functions as a light absorber, absorbs sunlight, injects electrons into the metal oxide fine particles (9), and generates power.
[0005]
In the case of a silicon solar cell, a band gradient is formed by a pn junction of silicon, electrons and holes generated by light irradiation are separated by an internal electric field, and an electromotive force is generated.
[0006]
In contrast, in the dye-sensitized solar cell, only electrons of the dye (10) excited by sunlight are injected into the metal oxide fine particles (9), and there is almost no loss due to recombination of electrons and holes. . The dye (10) oxidized by electron injection into the metal oxide fine particles (9) is promptly reduced by the donor present in the electrolytic solution (7), and returns to the initial state.
[0007]
Unlike silicon solar cells, in which light energy is absorbed and electrons are transmitted in the same silicon semiconductor, in the case of a dye-sensitized solar cell, as described above, light energy is absorbed and electrons are transmitted. Is transmitted in separate places, similar to the way plants absorb light energy with chlorophyll and transfer electrons with mediators in the cell membrane.
[0008]
This type of solar cell is called a wet solar cell because it uses an electrolytic solution, and is particularly called a dye-sensitized solar cell because it uses a dye as a sensitizer.
[0009]
Gretzel et al. Use a porous titanium oxide film obtained by sintering nanoscale titanium oxide fine particles, make the surface area approximately 1000 times the projected area, have good compatibility with the titanium oxide film, and efficiently absorb sunlight. Ruthenium complex (RuL₂(NCS)₂, L = 4,4′-dicarboxy-2,2 ′ bipyridine), the sunlight of AM1.5 (air mass 1.5: sunlight in the solar spectrum at midlong longitude of the earth) A conversion efficiency of 10% is obtained. At this time, the electrolytic solution was a mixture of 90% by volume of acetonitrile and 10% by volume of 3-methyl-2-oxazolidinone to which iodine and lithium iodide were added.⁻/ I₃ ⁻It functions as a redox couple (MK Nazeeruddin et al., J. Am. Chem. Soc. 1993, 115, 6382, and JP-A-1-220380).
[0010]
However, when a dye-sensitized solar cell module is installed on a roof, almost all of the dye-sensitized solar cell module is planar, and a large area is obtained by combining a plurality of the dye-sensitized solar cells. In order to construct a solar cell, it is necessary to form a frame part that does not contribute to photoelectric conversion while taking out the wiring and various members on the exterior, while being arranged adjacent to each other. The effective area for the operation is reduced. Therefore, in order to be put to practical use in a private house, the size of the roof is limited, so that a further improvement in photoelectric conversion efficiency has been desired to achieve a practical level of conversion efficiency.
[0011]
In a silicon solar cell, as a method of increasing power generation capacity when a solar cell module is installed on a roof of a house, for example, JP-A-6-120547 discloses that a solar cell is made of a transparent material between upper and lower surfaces parallel to each other. A sealed solar cell module is described. The solar cells are arranged in an inclined state with respect to the both surfaces, and the solar cell is inclined at a required angle in accordance with the inclination angle of the roof to which the solar cell module is attached, so that The battery cells can be leveled, thereby maximizing the power generation capacity of the solar cell module throughout the year.
[0012]
On the other hand, in a dye-sensitized solar cell, as shown in FIG. 1 of JP-A-2002-260746, a semiconductor electrode (2) and a transparent electrode (1) disposed on a light-receiving surface (F2) thereof are provided. ), A counter electrode (CE), and an electrolyte (E) filled in a gap formed between the photoelectrode (WE) and the counter electrode (CE) by the spacer (S). Dye-sensitized solar cells are described. The semiconductor electrode (2) such that the incident angle of light incident on the light receiving surface (F2) of the semiconductor electrode (2) is 30 to 80 ° from the normal direction of the light receiving surface (F1) of the transparent electrode (1). Are formed in a sawtooth shape when viewed from the cross-sectional direction, and a contact surface (F2) between the transparent electrode (1) and the semiconductor electrode (2) is also formed with a sawtooth groove in accordance with the shape of the semiconductor electrode (2). Further, a light guide means for changing the traveling direction of light incident on the light receiving surface of the transparent electrode from the outside is formed, and the light guide means travels inside the transparent electrode and is obliquely incident on the light receiving surface of the semiconductor electrode as described above. By doing so, there has been proposed a dye-sensitized solar cell in which the incident light utilization factor is improved as compared with the case where light is vertically incident on a semiconductor electrode, and the amount of power generation per unit effective area is improved. According to the present invention, a transparent electrode substrate having a sawtooth cross-sectional shape is required as a substrate, and a similar transparent electrode substrate is also required for a counter electrode, resulting in an increase in manufacturing cost. In addition, it is necessary to accurately oppose a photoelectrode having a transparent electrode having a sawtooth cross-sectional shape and a similar counter electrode, which poses a problem from the viewpoint of productivity.
[0013]
Japanese Patent Application Laid-Open No. 2001-35551 describes that metal fine particles are arranged near a dye. .
[0014]
[Patent Document 1]
JP-A-1-220380
[0015]
[Patent Document 2]
JP-A-6-120547
[0016]
[Patent Document 3]
JP-A-2002-260746
[0017]
[Patent Document 4]
JP 2001-35551 A
[0018]
[Non-patent document 1]
M. K. Nazeeruddin et al. , J. et al. Am. Chem. Soc. 1993, 115, 6382
[0019]
[Problems to be solved by the invention]
An object of the present invention is to provide a dye-sensitized solar cell module having a small installation area and capable of improving photoelectric conversion efficiency per projected area.
[0020]
[Means for Solving the Problems]
The dye-sensitized solar cell module of the present invention comprises a module support substrate, a plurality of dye-sensitized solar cells, and the same number of reflecting mirrors. One of the mirrors is disposed adjacently in pairs and is inclined at the same predetermined angle with respect to the module support substrate so that each faces at an angle.
[0021]
The predetermined angle is preferably from 10 to 80 °, and more preferably from 45 to 80 °.
[0022]
The dye-sensitized solar cell includes a cathode electrode, an anode electrode, and an oxidation-reduction electrolyte filled therebetween, and the cathode electrode includes a first transparent substrate provided inside a first transparent substrate. A conductive film is formed, and platinum fine particles or carbon fine particles are adhered to the surface of the first transparent conductive film, and the anode electrode is provided inside the second transparent substrate with the second transparent conductive film and the metal oxide. It is preferable that thin films are sequentially formed, and a dye is supported on the surface of the metal oxide thin film.
[0023]
Alternatively, the dye-sensitized solar cell includes a cathode electrode, an anode electrode, and a redox electrolyte filled therebetween, and the cathode electrode includes a first transparent substrate inside a first transparent substrate. A platinum fine particle or a carbon fine particle is adhered to the surface of the first transparent conductive film, and the anode electrode is provided inside the second transparent substrate with the second transparent conductive film and the metal. An oxide thin film is sequentially formed, and a dye is supported on the surface of the metal oxide thin film. In the vicinity of the dye, at least one kind selected from the group consisting of Pt, a Pt alloy, Pd, and a Pd alloy is provided. It is preferable to dispose metal fine particles.
[0024]
The metal oxide thin film is made of titanium oxide (TiO 2).₂), Zinc oxide (ZnO), niobium oxide (Nb)₂O₅), Tin oxide (SnO)₂) Or strontium titanate (SrTiO₃) Is desirable.
[0025]
Further, it is preferable that the dye is a ruthenium complex, a porphyrin complex, a xanthene dye, a methine dye, a coumarin dye, an acridine dye, or a phenylmethane dye.
[0026]
It is preferable that the redox electrolyte is an electrolyte containing iodine, bromine, or chlorine, or a solid conductor containing iodine, bromine, or chlorine.
[0027]
Further, it is desirable that the first transparent substrate and the second transparent substrate are made of glass, PET or polyimide.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
In order to reduce the installation area of the dye-sensitized solar cell module, it is required to improve the photoelectric conversion efficiency of the dye-sensitized solar cell. In the dye-sensitized solar cell, by increasing the thickness of the metal oxide porous film, the surface area per projected area can be increased, and the amount of dye adsorbed on the metal oxide porous film can be increased. Also, the photoelectric conversion efficiency is improved by increasing the amount of the adsorbed dye. However, in practice, even if the thickness of the porous metal oxide film is increased, the photoelectric conversion efficiency does not improve beyond a certain value. This phenomenon is considered to be due to the fact that even if electrons are injected from a dye into a metal oxide far from the transparent conductive film, it is consumed as Joule heat before being collected by the transparent conductive film. To solve this problem, it is conceivable to make the metal oxide conductive or to mix a conductive substance. There is also an attempt to form a collecting electrode in a porous metal oxide film, but there is a problem that the manufacturing process becomes complicated.
[0029]
Accordingly, the present inventors have focused on a structure in which the optical path length can be increased in the metal oxide porous film and the distance to the transparent conductive film is reduced, and have proceeded with research.
[0030]
FIG. 5 shows the relative short-circuit current density of the dye-sensitized solar cell (△), the relative short-circuit current density of the dye-sensitized solar cell module in which a reflecting mirror is opposed to the dye-sensitized solar cell (○), Relative short-circuit current density (□) of amorphous silicon (a-Si) solar cell, relative to dye-sensitized solar cell, dye-sensitized solar cell module and amorphous silicon (a-Si) solar cell to sunlight The projection area (solid line) is shown.
[0031]
As the angle of incidence θ (°) increases, the relative projected area (solid line) decreases at COS θ. The relative short-circuit current density (□) of the amorphous silicon (a-Si) solar cell also decreases in accordance with the change in the relative projected area. At this time, the reason why the relative projection area is slightly lower than the change is that the reflection loss on the surface increases as the incident angle increases. On the other hand, the relative short-circuit current densities (△) and (○) of the dye-sensitized solar cell and the dye-sensitized solar cell module hardly change even at an incident angle of 30 °. The relative short-circuit current density (△) of the dye-sensitized solar cell decreases around 40 °, but is smaller than the decrease in the relative projected area (solid line). This indicates that the conversion efficiency is apparently improved.
[0032]
From these facts, if the inclination angle is smaller than 10 °, only the characteristics and the surface area per projected area that are the same as those when the apparatus is installed in a flat plate shape can be obtained. On the other hand, if the inclination angle exceeds 80 °, the installation area is reduced. It can be seen that the incident light cannot be used effectively, and the use efficiency cannot be increased.
[0033]
Furthermore, in the case of the dye-sensitized solar cell module in which the reflecting mirror is opposed to the dye-sensitized solar cell at an angle (○), the effect of the reflecting mirror is not obtained up to an incident angle of 30 °. If the angle exceeds 30 °, the light reflected by the opposing reflecting mirrors is incident on the opposing dye-sensitized solar cell and contributes to power generation. Up to an incident angle of 45 °, the reflected light component monotonically increases as the angle increases. At an angle of incidence of 45 °, multiple reflection components between the dye-sensitized solar cell and the reflector also contribute, and as the angle of incidence increases, the light confinement effect suddenly becomes remarkable, and the power generation efficiency increases Increase.
[0034]
FIG. 6 shows the increase in the power generation efficiency in terms of the enhancement rate per unit area (relative short-circuit current / relative projected area).
[0035]
The enhancement factor (□) of the amorphous silicon (a-Si) solar cell is slightly less than 1 up to 60 degrees, and there is no gain by tilting. Further, it is significantly less than 1 at 70 degrees or more. On the other hand, in the dye-sensitized solar cell, a maximum gain of 30% can be obtained due to the effect that the incident optical path length becomes longer than the electron moving distance by tilting (△). When a reflecting mirror is further opposed to the dye-sensitized solar cell (○), the reflection effect appears in addition to the effect that the incident optical path length becomes longer than the electron moving distance from the incident angle of about 30 °. From the angle of incidence of 45 °, the multiple reflection effect is also added, and the gain sharply increases. When the angle of incidence is around 70 °, the gain reaches about three times. Considering that the reflector occupies half of the projected area, the gain per unit area is about 1.5 times. Further, half of the projected area may be a reflection mirror instead of the dye-sensitized solar cell, and therefore, there is an advantage that the cost is reduced to almost half.
[0036]
That is, even if the dye-sensitized solar cell is tilted, the photocurrent per projected area is not significantly reduced, and further, one dye-sensitized solar cell and one reflector are paired to form a module support substrate. By installing the mirrors facing each other at the same inclination angle with respect to the plane, the sunlight reflected by the reflector can be effectively incident on the dye-sensitized solar cell, and the conversion efficiency per projected area can be reduced. It has been found that the number of dye-sensitized solar cell modules that can be installed to obtain necessary power can be reduced.
[0037]
The configuration of the strip-shaped dye-sensitized solar cell according to the present invention will be described with reference to FIG. 2 showing a cross-sectional view.
[0038]
The strip-shaped dye-sensitized solar cell comprises a glass substrate (4b), a transparent conductive film (for example, fluorine-doped tin oxide) (5b), and platinum or carbon fine particles adhered to the transparent conductive film (5b). 8), a glass substrate (4a), a transparent conductive film (for example, fluorine-doped tin oxide) (5a), and a porous metal oxide porous film formed on the transparent conductive film (5a). A thin film (6), a dye (10) supported on the surface of metal oxide fine particles (9) constituting the metal oxide porous thin film (6), an anode electrode serving as a photoelectrode, and a redox electrolyte (7).
[0039]
The oxidation-reduction electrolyte (7) is obtained by adding iodine and lithium iodide to a mixed solvent of 90% by volume of acetonitrile, which is an iodine-based electrolyte, and 10% by volume of 3-methyldioxazolidinone. I₃ ⁻/ I⁻) And contributes to the electron transfer between the cathode electrode and the anode electrode.
[0040]
The metal oxide fine particles (9) can be formed, for example, of titanium oxide fine particles.
[0041]
When a dye (10) made of, for example, a ruthenium complex is used as the dye (10), the dye (10) absorbs light, and the electrons excited by the ruthenium metal / ligand orbit transition cause conduction of titanium oxide. The band moves to a photocurrent and power is generated. Further, as described in the above-mentioned JP-A-2001-35551, a dye-sensitized solar cell further improved in characteristics by disposing fine metal particles near the dye (10) is more preferable. As such metal fine particles, it is preferable to use at least one kind of metal fine particles selected from the group consisting of Pt, Pt alloy, Pd, and Pd alloy. This is because the metal fine particles do not react with and dissolve in the halogen-based redox electrolyte, and by disposing the metal fine particles, the absorbance of visible light to the near infrared region is lower than the absorbance of the Ru dye. It is because it is strengthened over.
[0042]
FIG. 3 is a cross-sectional view showing a case where sunlight is vertically incident on a strip-shaped dye-sensitized solar cell as in the related art. The optical path length (11) of incident light contributing to power generation is the thickness of the metal oxide porous film (6), and the shortest distance (12) of electron transfer from the position farthest from the transparent conductive film (5a) is also large. And the thickness of the metal oxide porous membrane (6).
[0043]
FIG. 4 is a cross-sectional view showing a case where sunlight enters the strip-shaped dye-sensitized solar cell at an angle θ as in the present invention. The sunlight enters the dye-sensitized solar cell at an angle θ from the normal direction of the light-receiving surface glass substrate, and the optical path length (11) of the incident light contributing to power generation is (metal oxide). The thickness of the porous film (6)) / COS θ, and the greater the inclination angle θ, the longer the optical path length (11) of the incident light. However, the shortest distance (12) of electron transfer from the position farthest from the transparent conductive film (5a) remains the thickness of the metal oxide porous film (6).
[0044]
At this time, in the case of FIG. 4 in which the light is incident obliquely at an inclination angle θ with respect to FIG. 3 in which the vertically incident light is received, the thickness of the metal oxide porous film (6) is apparently thick. On the other hand, on the surface of the metal oxide porous film (6), electrons injected from the dye flow not in the incident light direction but in the shortest film thickness direction. It does not change even if the cell is tilted by the angle θ.
[0045]
Further, the optical path length cannot be increased at the end, and this effect cannot be obtained. Therefore, it is important that the slope is sufficiently longer than the thickness of the porous oxide film (6). Therefore, in the dye-sensitized solar cell module of the present invention for solving the above-mentioned problems, strip-shaped dye-sensitized solar cells are arranged at an angle.
[0046]
As described above, the dye-sensitized solar cell module in which strip-shaped dye-sensitized solar cells are arranged at an angle can reduce the installation area of the dye-sensitized solar cells having the same performance. This effect does not occur in the amorphous silicon (a-Si) solar cell as shown in FIG. 5, and is an effect peculiar to the dye-sensitized solar cell.
[0047]
In the present invention, furthermore, a plurality of strip-shaped dye-sensitized solar cells and a plurality of pairs of strip-shaped reflecting mirrors are inclined at the same angle with respect to a flat module supporting substrate, and each strip-shaped dye-sensitized A solar cell module and a strip-shaped reflecting mirror are installed facing each other to form a dye-sensitized solar cell module. At this time, the angle is desirably 10 to 80 °, and more desirably 45 to 80 °. When the angle is smaller than 10 °, only the characteristics and the installation area which are the same as those when the panel is installed in a flat shape are obtained. On the other hand, if the angle exceeds 80 °, the installation area can be reduced, but the incident light cannot be used effectively and the use efficiency cannot be increased. Above 45 °, the power generation efficiency increases due to the light confinement effect as described above.
[0048]
The structure of the dye-sensitized solar cell module of the present invention will be described with reference to the drawings.
[0049]
FIG. 1 is a perspective view showing a dye-sensitized solar cell module of the present invention.
[0050]
The dye-sensitized solar cell module of the present invention comprises a plurality of pairs of a strip-shaped dye-sensitized solar cell (1) and a plurality of strip-shaped reflecting mirrors (2) placed on a flat module supporting substrate (13). It is characterized by being arranged to be inclined at the same angle, and each strip-shaped dye-sensitized solar cell (1) and the strip-shaped reflecting mirror (2) facing each other. In this case, the sunlight reflected from the light receiving surface of the reflecting mirror (2) can be received by the strip-shaped dye-sensitized solar cell (1), so that the sunlight can be used effectively and the projection can be performed. The conversion efficiency per area can be improved, and the number of dye-sensitized solar cells for obtaining necessary power can be reduced.
[0051]
According to the present invention described above, in the dye-sensitized solar cell having the same performance, in particular, the installation area is small and the projection area is small without forming a special shape in the light receiving portion or arranging a special member. It is possible to provide a dye-sensitized solar cell module that can improve photoelectric conversion efficiency per area and can also effectively use sunlight reflected light.
[0052]
【Example】
The present invention is illustrated by the following examples. However, the present invention is not limited to these.
[0053]
(Example 1)
Under the following conditions, a dye-sensitized solar cell module of the present invention was constructed, and its characteristics were evaluated.
[0054]
Regarding the strip-shaped dye-sensitized solar cell, commercially available fluorine-doped SnO is applied to the transparent substrate on which the transparent conductive film is formed.₂Glass (manufactured by Nippon Sheet Glass, conductive layer thickness 450 nm) was used. The metal oxide thin film is made of TiO having an average particle size of 15 nm as titanium oxide.₂A paste (manufactured by Solaronix) was used.
[0055]
Fluorine-doped SnO₂A titanium oxide paste was applied on the glass, air-dried, and then fired at 500 ° C. for 30 minutes in an electric furnace. A titanium oxide porous film having a thickness of about 2 μm was formed by one coating, and the coating was repeated about five times to obtain a thickness of about 10 μm. The titanium oxide porous film was immersed in a Ru dye solution and refluxed at 80 ° C. for 2 hours to carry the Ru dye on the surface of the porous titanium oxide. Ru dye solution was added to ethanol at 3 × 10^-4It was prepared by dissolving a mol / L Ru dye (Ruthenium 535, manufactured by Solaronix). As described above, an anode electrode serving as a photoelectrode was formed.
[0056]
On the other hand, the cathode electrode is a fluorine-doped SnO₂It was formed by depositing platinum on the surface of glass by sputtering.
[0057]
A battery structure was formed by holding the cathode electrode and the anode electrode facing each other, and an oxidation-reduction electrolyte was injected into the gap. The oxidation-reduction electrolyte is an iodine-based electrolyte, which is obtained by adding iodine and lithium iodide to a mixed solvent of 90% by volume of acetonitrile and 10% by volume of 3-methyl-2-oxazolidinone.
[0058]
As shown in FIG. 1, the dye-sensitized solar cell module includes three pairs of the 1 cm × 5 cm strip-shaped dye-sensitized solar cell and a 1 cm × 5 cm reflecting mirror, which are the same as the module supporting substrate. They were installed facing each other at an angle of inclination. The inclination angle θ was 70 °. Projected area is 10cm²Met.
[0059]
With the dye-sensitized solar cell module of the present example, a solar simulator of AM1.5 was used at 1000 W / m²As a result of measuring the current-voltage characteristics by irradiating the pseudo sunlight as described above, a short circuit current of 150 mA and an open voltage of 0.7 V were obtained. The short-circuit current density obtained by dividing the short-circuit current value by the projected area is 15 mA / cm.²Met.
[0060]
From comparison with the measurement results of Comparative Example 1 described later, it was confirmed that the installation area of the dye-sensitized solar cell module could be reduced to 2/3 while obtaining the same performance as Comparative Example 1. Here, the short-circuit current value means that when a solar simulator is arranged on the dye-sensitized solar cell module so that the optical axis is vertical, the terminals of the dye-sensitized solar cell module are short-circuited, and light is irradiated. Means the current value measured.
[0061]
(Example 2)
A dye-sensitized solar cell module was manufactured in the same manner as in Example 1 except that the inclination angle θ was set to 80 °. Projected area is 5.2cm²Met.
[0062]
As a result of measuring the current-voltage characteristics in the same manner as in Example 1, a short-circuit current of 77 mA and an open-circuit voltage of 0.7 V were obtained. The short-circuit current density obtained by dividing the short-circuit current value by the projected area is 15 mA / cm.²Met.
[0063]
From comparison with the measurement results of Comparative Example 1 described later, it was confirmed that the installation area of the dye-sensitized solar cell module could be reduced to 2/3 while obtaining the same performance as Comparative Example 1.
[0064]
(Example 3)
A dye-sensitized solar cell module was manufactured in the same manner as in Example 1 except that the inclination angle θ was set to 60 °. Projected area is 15cm²Met.
[0065]
As a result of measuring the current-voltage characteristics in the same manner as in Example 1, a short-circuit current of 171 mA and an open-circuit voltage of 0.7 V were obtained. The short-circuit current density obtained by dividing the short-circuit current value by the projected area is 11.4 mA / cm.²Met.
[0066]
From a comparison with the measurement result of Comparative Example 1 described later, the short-circuit current value was improved by 14% with the same projected area as that of Comparative Example 1. In terms of the installation area, it was confirmed that the area could be reduced by 12%.
[0067]
(Example 4)
A dye-sensitized solar cell module was manufactured in the same manner as in Example 1 except that the inclination angle θ was set to 50 °.
[0068]
As a result of measuring the current-voltage characteristics in the same manner as in Example 1, a short-circuit current of 175 mA and an open-circuit voltage of 0.7 V were obtained.
[0069]
(Example 5)
A dye-sensitized solar cell module was manufactured in the same manner as in Example 1 except that the inclination angle θ was set to 40 °.
[0070]
As a result of measuring the current-voltage characteristics in the same manner as in Example 1, a short-circuit current of 154 mA and an open-circuit voltage of 0.7 V were obtained.
[0071]
(Example 6)
A dye-sensitized solar cell module was manufactured in the same manner as in Example 1 except that the inclination angle θ was set to 30 °.
[0072]
As a result of measuring the current-voltage characteristics in the same manner as in Example 1, a short-circuit current of 149 mA and an open-circuit voltage of 0.7 V were obtained.
[0073]
(Example 7)
A dye-sensitized solar cell module was manufactured in the same manner as in Example 1 except that the inclination angle θ was set to 20 °.
[0074]
As a result of measuring the current-voltage characteristics in the same manner as in Example 1, a short-circuit current of 153 mA and an open-circuit voltage of 0.7 V were obtained.
[0075]
(Example 8)
A dye-sensitized solar cell module was manufactured in the same manner as in Example 1 except that the inclination angle θ was set to 10 °.
[0076]
As a result of measuring current-voltage characteristics in the same manner as in Example 1, a short-circuit current of 151 mA and an open-circuit voltage of 0.7 V were obtained.
[0077]
From the above Examples 1 to 8 and Comparative Example 1 described later, it was confirmed that the short-circuit current value was increased as compared with Comparative Example 1 at 10 ° or more by facing the reflecting mirror.
[0078]
(Comparative Example 1)
A dye-sensitized solar cell module was produced in the same manner as in Example 1 except that the inclination angle θ was 0 °, that is, the planar shape was adopted. Projected area is 15cm²Met.
[0079]
As a result of measuring the current-voltage characteristics in the same manner as in Example 1, a short-circuit current of 150 mA and an open-circuit voltage of 0.7 V were obtained.
[0080]
The short-circuit current density obtained by dividing the short-circuit current value by the projected area is 10 mA / cm.²Met.
[0081]
【The invention's effect】
Advantageous Effects of Invention According to the present invention, the installation area is small, the photoelectric conversion efficiency per projection area can be improved, sunlight reflected light can also be effectively used, and the use of a dye-sensitized solar cell to obtain necessary power The number of sheets can be reduced, and an inexpensive dye-sensitized solar cell module can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a dye-sensitized solar cell module of the present invention.
FIG. 2 is a sectional view showing a dye-sensitized solar cell.
FIG. 3 is a cross-sectional view showing a case where sunlight is vertically incident on a strip-shaped dye-sensitized solar cell.
FIG. 4 is a cross-sectional view showing a case where sunlight enters a strip-shaped dye-sensitized solar cell at an angle θ.
FIG. 5 is a graph showing an incident angle dependency of a relative short-circuit current density and a relative projected area.
FIG. 6 is a graph showing the incident angle dependence of the short-circuit current density enhancement rate.
[Explanation of symbols]
1. Strip-shaped dye-sensitized solar cell
2 Reflector
3 Dye-sensitized solar cell module
4a, 4b glass substrate
5a, 5b transparent conductive film
6. Porous metal oxide membrane
7 Redox electrolyte
8 Platinum fine particles or carbon fine particles
9 Metal oxide fine particles
10 Dye
11 Optical path length in porous metal oxide film
12 Thickness of metal oxide porous membrane
13 Module support board
θ tilt angle

Claims (10)

A module support substrate, a plurality of dye-sensitized solar cells, and a dye-sensitized solar cell module including the same number of reflecting mirrors, wherein one of the dye-sensitized solar cells and the reflecting mirror One of which is arranged adjacent to each other in a pair, and is inclined at the same predetermined angle with respect to the module supporting substrate so that they face each other at an angle. Battery module. The dye-sensitized solar cell module according to claim 1, wherein the predetermined angle is 10 to 80 °. The dye-sensitized solar cell module according to claim 1, wherein the predetermined angle is 45 to 80 °. The dye-sensitized solar cell includes a cathode electrode, an anode electrode, and an oxidation-reduction electrolyte filled therebetween, and the cathode electrode includes a first transparent substrate provided inside a first transparent substrate. A conductive film is formed, and platinum fine particles or carbon fine particles are adhered to the surface of the first transparent conductive film, and the anode electrode is provided inside the second transparent substrate with the second transparent conductive film and the metal oxide. The dye-sensitized solar cell module according to any one of claims 1 to 3, wherein a thin film is sequentially formed, and a dye is carried on a surface of the metal oxide thin film. The dye-sensitized solar cell includes a cathode electrode, an anode electrode, and an oxidation-reduction electrolyte filled therebetween, and the cathode electrode includes a first transparent substrate provided inside a first transparent substrate. A conductive film is formed, and platinum fine particles or carbon fine particles are adhered to the surface of the first transparent conductive film, and the anode electrode is provided inside the second transparent substrate with the second transparent conductive film and the metal oxide. A thin film is sequentially formed, a dye is supported on the surface of the metal oxide thin film, and at least one type of metal fine particle selected from the group consisting of Pt, a Pt alloy, Pd, and a Pd alloy is provided near the dye The dye-sensitized solar cell module according to any one of claims 1 to 3, wherein The metal oxide thin film is made of titanium oxide (TiO ₂ ), zinc oxide (ZnO), niobium oxide (Nb ₂ O ₅ ), tin oxide (SnO ₂ ), or strontium titanate (SrTiO ₃ ). The dye-sensitized solar cell module according to claim 4. The dye according to any one of claims 4 to 6, wherein the dye is a ruthenium complex, a porphyrin complex, a xanthene dye, a methine dye, a coumarin dye, an acridine dye, or a phenylmethane dye. Sensitized solar cell module. The dye-sensitized solar cell module according to any one of claims 4 to 7, wherein the redox electrolyte is an electrolyte containing iodine, bromine, or chlorine. The dye-sensitized solar cell module according to any one of claims 4 to 8, wherein the redox electrolyte is a solid conductor containing iodine, bromine, or chlorine. The dye-sensitized solar cell module according to any one of claims 4 to 9, wherein the first transparent substrate and the second transparent substrate are made of glass, PET, or polyimide.

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