JP2014143384A - Solar cell module and solar cell panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module which is expected as a countermeasure of global warming prevention and in which a sophisticated design is imparted to the light receiving surface.SOLUTION: In a solar cell module having two or more of solar cell elements arranged at an interval, between solar cell elements, a first coloring layer is provided which has the same color as the solar cell element, and on the light receiving surface side, a diffusion layer and a second coloring layer are provided from the solar cell element side in this order directly or via the other layer.

Description

  The present invention relates to a solar cell module and a solar cell panel.

Currently, as a measure to prevent global warming, efforts are being made to reduce CO ₂ emissions on a global scale, and a solar cell module in which a plurality of solar cells are electrically connected as a clean power generation device to replace thermal power generation, and A solar cell panel in which a plurality of such solar cell modules are electrically connected has been attracting attention, and research and development are thriving.

  Further, in recent years, solar cell modules and solar cell panels are used not only outdoors but also mounted on various indoor items, and their design properties may become a problem. There is also a demand to give desired design properties to the entire light receiving surface of the solar cell panel.

  As a technique for imparting design properties to the light receiving surface of a solar cell module, for example, there are techniques disclosed in Patent Document 1 and Patent Document 2.

JP 11-298026 A JP 2011-210861 A

  Patent Document 1 discloses a technique for providing design properties by providing a diffusion layer on the light receiving surface side of a solar cell module, diffusing light in the diffusion layer, and making the entire light receiving surface white. .

  In Patent Document 2, the non-light-receiving surface side filler constituting the solar cell module is colored to color the space between the solar cell element and the solar cell element, thereby providing a design property to the light-receiving surface of the solar cell module. The technology to grant is disclosed.

  However, in these technologies, the light receiving surface of the solar cell module or solar cell panel is uniformly white, or the space between the solar cell element and the solar cell element is inconspicuous. It was only possible to impart a design property such as making the surface a striped pattern, and it was difficult to impart a sophisticated design such as a desired picture or character.

  The present invention is an invention made in view of such a current situation, and is a solar cell module and a solar cell panel that are expected as a measure for preventing global warming, and a high design is given to the light receiving surface thereof. It is a main object to provide a solar cell module and a solar cell panel.

  The invention for solving the above-mentioned problems is a solar cell module having two or more solar cell elements arranged at intervals, and between the solar cell element and the solar cell element, the same color as the solar cell element A first colored layer is provided, and a diffusion layer and a second colored layer are provided in this order directly or via another layer on the light receiving surface side of the solar cell module from the solar cell element side. It is characterized by.

  In the above invention, the second colored layer may be dot-shaped.

  In the above invention, a transparent layer may be provided between the diffusion layer and the second colored layer.

  In the above invention, the second colored layer may contain a dye.

  In the above invention, a protective layer may be provided on the second colored layer.

  Moreover, another invention for solving the above-mentioned problem is a solar cell panel having two or more solar cell modules arranged at intervals, wherein the solar cell module has two or more solar cell elements, Between the solar cell element and the solar cell element in the solar cell module, and between the solar cell module and the solar cell module, a first colored layer having the same color as the at least one solar cell element is provided, On the light receiving surface side of the solar cell panel, a diffusion layer and a second colored layer are provided in this order directly or via another layer from the solar cell element side.

  Furthermore, another invention for solving the above-mentioned problem is a solar cell panel having two or more solar cell modules arranged at intervals, wherein the solar cell module has two or more solar cell elements, Between the solar cell module and the solar cell module, a first colored layer having the same color as the at least one solar cell element is provided, and on the light receiving surface side of the solar cell panel, from the solar cell element side The diffusion layer and the second colored layer are provided directly or via other layers in this order.

  According to the solar cell module of the present invention, since the first colored layer having the same color as the solar cell element is provided between the solar cell elements, the diffusion layer is provided on the light receiving surface side. By the first colored layer and the diffusing layer, the base before the second colored layer is formed can be a so-called white or light gray with no color unevenness. Since the layer is formed, the coloring of the second colored layer is improved, and a high-level design can be imparted. In addition, as described above, the second colored layer itself can be formed on a clean base with no color unevenness, so it does not necessarily have to be formed on the entire light receiving surface, and may be a pattern or a character. This is possible and the range of design choices can be expanded.

  Moreover, according to the solar cell panel of the present invention, since the first colored layer is provided between the solar cell module and the solar cell module, the color unevenness caused between the solar cell module and the solar cell module is reduced. Can be resolved.

It is sectional drawing of the solar cell module concerning 1st Embodiment of this invention. It is sectional drawing of the solar cell module concerning 2nd Embodiment of this invention. It is sectional drawing of the solar cell module concerning 3rd Embodiment of this invention. It is a schematic sectional drawing of the solar cell panel concerning 4th Embodiment of this invention. It is a schematic sectional drawing of the solar cell panel concerning 5th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the form demonstrated below, In the range which does not deviate from a technical thought, it can implement in various deformation | transformation. In the accompanying drawings, the vertical and horizontal scales may be exaggerated for the sake of explanation, and the actual scales may differ.

<First Embodiment>
FIG. 1 is a schematic cross-sectional view of a solar cell module according to a first embodiment of the present invention.

  The solar cell module 100 according to the present embodiment includes two or more solar cell elements 11, 11... Arranged at intervals, and a light receiving surface side thermoplastic resin layer sandwiching the solar cell elements 11, 11. 30, the back surface side thermoplastic resin layer 31, the polyethylene terephthalate resin layer 33 disposed on the light receiving surface side thermoplastic resin layer 30, the back sheet 34 disposed on the back surface of the solar cell module 100, and the solar cell module. And a first colored layer having the same color as that of the solar cell element 11 between the back sheet 34 and the back surface side thermoplastic resin layer 31. Further, the diffusion layer 13 and the second colored layer 21 are provided in this order from the solar cell element 11 side on the light receiving surface side. Then, the back sheet 34 and the sealing material 35 are heat-sealed so that the whole is integrated.

  According to such a solar cell module 100, the first colored layer 20 having the same color as the solar cell element 11 can be visually recognized from between the solar cell element 11 and the solar cell element 11 when observed from the light receiving surface side. Between the solar cell elements 11 can be made inconspicuous, and since the diffusion layer 13 is provided on the light receiving surface side, the diffusion layer 13 can appropriately diffuse light, and the first colored layer Due to the synergistic effect with 20, the entire surface of the diffusion layer 13 can be white or light gray with no color unevenness. And since the 2nd colored layer 21 is provided on such a uniform base | substrate, the said 2nd colored layer 21 expresses a desired color, without being influenced by the solar cell element 11 or the color between them. Therefore, it is possible to reproduce an advanced design as a whole.

  Below, each structure of the solar cell module 100 is demonstrated.

(Solar cell element)
The solar cell element 11 in the solar cell module 100 of the present embodiment is not particularly limited, and a conventionally known one can be appropriately selected and used. As such a solar cell element 11, for example, a single crystal silicone type solar cell element, a polycrystalline silicon type solar cell element, an amorphous silicon type solar cell element, a compound semiconductor type solar cell element, a dye-sensitized solar cell element, Examples thereof include a quantum dot solar cell element and an organic thin film solar cell element.

  Among these solar cell elements, dye-sensitized solar cell elements are manufactured without the need for vacuum conditions in the manufacturing process and the advantage of high power generation efficiency at low illuminance such as indoor light such as fluorescent lamps and near windows. It can be particularly preferably used because of its low cost. In addition, since the dye-sensitized solar cell element is used indoors as described above, it is often required to have a design property and is also preferable in that the effect of the present invention can be exhibited.

(First colored layer)
Although the 1st colored layer 20 in the solar cell module 100 concerning this embodiment is characterized by being the same color as the solar cell element 11, it does not specifically limit about the coloring method, Various conventionally well-known various What is necessary is just to color suitably using a coloring material etc. Specifically, various dyes and various pigments can be used in combination as appropriate. Further, the shape of the colorant is not particularly limited, and spherical, needle-like, and scale-like particles may be used, and the size may be about 1 nm to 100 μm.

  Moreover, the 1st colored layer 20 may contain arbitrary components other than the said coloring material. For example, components necessary for forming the first colored layer 20 such as a resin as a binder, a solvent, and a dispersant can be arbitrarily blended.

  The thickness of the first colored layer 20 is not particularly limited, and the portion where the first colored layer 20 is formed, the configuration of the entire solar cell module 100, the color expected of the first colored layer 20, and the like. Can be designed as appropriate. For example, when forming as a solid layer on the back sheet | seat 34 like this embodiment, it can be set as about 100 nm-10 micrometers.

  The method for forming the first colored layer 20 is not particularly limited. For example, it may be formed by preparing an ink containing a colorant and applying it on the back sheet 34 by various application methods, or by printing on the back sheet 34 by various printing methods. Moreover, these may be used as the first colored layer 20 by installing a colored film or paper between the back sheet 34 and the back side thermoplastic resin layer 31.

The color of the first colored layer 20 is the same color as the solar cell element 11. Here, the color of the solar cell element 11 means the color of the photoelectric conversion layer constituting the solar cell 11. Further, the same color means that it is difficult to distinguish between the solar cell element 11 and the solar cell element 11 and the solar cell element 11 when the solar cell module 100 is observed from the light receiving surface side. More specifically, it means that the color difference ΔE calculated by the following equation is less than 3. The following L ^* , a ^* , and b ^* are values measured with a color difference meter CR-5 (manufactured by Konica Minolta). Moreover, what is necessary is just to make it the same color as the color of any one of the solar cell elements 11 in the case where there are a plurality of colors of the solar cell elements 11 constituting the solar cell module 100.
ΔE = {(ΔL ^* ) ² + (Δa ^* ) ² + (Δb ^* ) ² } ^1/2
Delta] E: The color difference [Delta] L ^*: difference between the photoelectric conversion layer of the L ^* a colored layer of the solar cell L ^* .DELTA.a ^*: difference between a ^* of the photoelectric conversion layer of a ^* and the coloring layer of the solar cell [Delta] b ^*: solar cell Difference between b ^* of the photoelectric conversion layer and b ^* of the colored layer L ^* , a ^* , and b ^* : L ^* a ^* recommended by the International Commission on Illumination (CIE) in 1976 and defined in JIS Z8729 b ^* Color system value

  In the solar cell module 100 according to the present embodiment, the first colored layer 20 is formed as a solid layer between the back sheet 34 and the back surface side thermoplastic resin layer 31, but the present invention is not limited to this. (1) The first colored layer 20 is formed in a pattern layer between the back sheet 34 and the back surface side thermoplastic resin layer 31 and including a portion between the solar cell element 11 and the solar cell element 11. In addition, (2) the back side thermoplastic resin layer 31 may be caused to function as the first colored layer by including a coloring material in the back side thermoplastic resin layer 31, and (3) Even if the first colored layer 20 is formed on the pattern layer between the light receiving surface side thermoplastic resin layer 30 and the polyethylene terephthalate resin layer 33 and including the portion between the solar cell element 11 and the solar cell element 11. Good.

(Diffusion layer)
The diffusion layer 13 in the solar cell module 100 of the present embodiment is not particularly limited as long as it can diffuse incident light and express whiteness. For example, various conventionally known diffusion layers Can be appropriately selected and used.

  Here, the diffusion layer 13 may be used alone, but as shown in FIG. 1, it is particularly preferable to use the diffusion layer 13 in a state in which the gap 12 is provided below the diffusion layer. Thus, by providing the gap 12 below the diffusion layer 13, the light incident on the solar cell module 100 is not only diffused by the diffusion layer 13, but also the gap 12 and the layers existing thereunder, FIG. In this case, the light is also refracted and reflected at the interface with the polyethylene terephthalate resin layer 33, and the whiteness on the light receiving surface side of the solar cell module 100 can be improved by the synergistic effect of the diffusion layer 13 and the gap 12. In addition, when reproducing the whiteness of the same level as the case where the space | gap 12 is used by using only the diffusion layer 13 without providing the space | gap 12, you must increase the grade of the light diffusion by a diffusion layer more. As a result, the amount of light reaching the solar cell element 11 may be reduced, and power generation efficiency may be sacrificed.

  Here, when the gap 12 is formed, it is not necessary that the gap 12 is filled with a special gas, and it is sufficient that air exists. The air gap 12 does not need to be a continuous layer over the entire light receiving surface of the solar cell module 100, and therefore, as shown in FIG. 1, the gap 12 is interposed between the diffusion layer 13 and the polyethylene terephthalate resin layer 33, which is an underlying layer. You may form by interposing the substance which functions as the spacer S. Further, the thickness of the gap 12 is not particularly limited, and can be freely designed within a range where the above-described effects are exhibited. For example, the thickness is preferably about 1 nm to 1000 μm, and particularly preferably about 10 nm to 100 μm.

  As a specific example of the diffusion layer 13, for example, a film made of a polyester resin, a polycarbonate resin, or a polyolefin resin is used, and the diffusion layer 13 can be formed by forming irregularities on the surface of the film. By forming irregularities on the surface of the film in this manner, the convex portion is located below the diffusion layer 13, and in FIG. 1, functions as a spacer S in direct contact with the polyethylene terephthalate resin layer 33. A void can be formed.

  Thus, when using a film, although the thickness of the said film is suitably selected according to the use purpose, it can be set as about 30 micrometers-300 micrometers. The surface irregularities can be formed, for example, by containing polymer or inorganic particles such as acrylic particles, polystyrene particles, silica particles, etc., and spherical, true spherical, and acicular particles are suitable. Can be used. For example, these particles may be mixed with a binder resin in a solvent, and the solution may be applied to the film surface. The average particle diameter of these particles is preferably 30 μm or less. If the average particle diameter exceeds 30 μm, the coarse resin particles are likely to fall off, which tends to cause loss of the resin particles, and the coating film appearance tends to be lacking in uniformity with a sense of foreign matter. The thickness of the portion containing these particles is not particularly limited, but is preferably about 1 μm to 15 μm, for example. The back surface of the film is preferably a back surface mainly composed of at least one kind of particles selected from spherical or true spherical acrylic particles, styrene particles, silicone, crosslinked polyacrylate, and polyurethane. The diameter of the particles used in this case is preferably in the range of 1 μm to 60 μm, more preferably in the range of 5 μm to 20 μm. The thickness of the part containing the particles on the back side of the film is preferably in the range of 1 μm to 50 μm, for example. In addition, as a binder for fixing the particles on the back side of the film, polyester resin, acrylic resin, silicone acrylic resin, fluorine resin or fluorine-acrylic resin, or those obtained by adding a crosslinkable resin having a curing function to these resins, or polyurethane-based At least one or more resins selected from resins, curable resins such as epoxy resins, and the like can be used.

  By using the diffusion layer 13 as described above, since the particles are appropriately arranged on the back side thereof, the particles can be caused to function as the spacer S between the diffusion layer 13 and the layer existing therebelow. The gap 12 can be formed without installing a special spacer S.

(Second colored layer)
The second colored layer 21 in the solar cell module 100 of the present embodiment is a layer for imparting desired design properties to the solar cell module 100, and the coloring method, forming method, and the like are not particularly limited. It can be designed freely. Rather, in the solar cell module 100 of the present embodiment, the portion that is the base of the second colored layer 21 is, as described above, the first colored layer 20 and the diffusion layer 13 that are the same color as the solar cell element 11, and further Due to the synergistic effect with the gap 12, the entire surface is white or light gray with no color unevenness, so that a desired design can be freely designed.

  The component of the second colored layer 21 is not particularly limited, and as in the first colored layer 20, various dyes and various pigments can be used in appropriate combination as a coloring material. Further, in the second colored layer 21, in addition to the coloring material, optional components such as a resin as a binder, a solvent, a dispersant, and the like, which are necessary for forming the second colored layer 21, are arbitrarily added. Can be blended.

  Here, it is preferable to use a pigment as the coloring material of the second colored layer in that the weather resistance can be improved. On the other hand, the use of a dye as the second colored layer is preferable in that it can reproduce vivid colors and can improve design, and the dye reproduces the design with good color even when the coating amount is small. Therefore, even if the second colored layer is formed as a solid layer, high light transmittance can be maintained.

  In addition, since the 2nd colored layer 21 is located in the light-receiving surface side of the solar cell module 100, it is preferable to have transparency as much as possible from the viewpoint of the power generation efficiency of the solar cell element 11. The transparency may be appropriately designed in consideration of the balance between the desired design and the desired power generation efficiency. The average transmittance of the second colored layer 21 varies depending on the desired design, but is preferably 20% or more, preferably 50% or more, and more preferably 70% or more. Here, the average transmittance in this specification means the visible light transmittance in the in-plane average of the second colored layer 21. Visible light transmittance can be measured using a SM color computer SM-C (manufactured by Suga Test Instruments Co., Ltd.) in the visible light wavelength region from 380 nm to 750 nm. It is preferable from the viewpoint of accuracy improvement to adopt a value obtained by averaging the values. When there are places where the visible light transmittance is greatly different in the surface of the second colored layer, such as when a pattern or characters are formed on the second colored layer, select a place with a relatively large occupied area. Adopting those averages is sufficient.

(Other configuration of solar cell module)
In the solar cell module 100 according to the first embodiment shown in FIG. 1, the solar cell element 11, the first colored layer 20, the diffusion layer 13, the gap 12, the second colored layer 21, and the light receiving surface side thermoplastic resin layer. 30, the back side thermoplastic resin layer 31, the polyethylene terephthalate resin layer 33, the back sheet 34, and the sealing material 35, but these configurations are merely examples, the solar cell module of the present invention, It is not limited to the said structure, A various structure is employable. Also, these materials are not limited to this, and can be selected from various materials.

  Therefore, for example, a glass substrate can be used instead of the polyethylene terephthalate resin layer 33. However, when the gap 12 is provided, the layer provided at the position of the polyethylene terephthalate resin layer 33 in the present embodiment, that is, the diffusion layer 13 is used. It is preferable to dispose a layer having a certain degree of hardness in the layer facing through the gap 12. In forming the solar cell module 100, as described above, the back sheet 34 and the sealing material 35 are heat-sealed and integrated as a whole. At this time, the diffusion layer 13 is pressed downward in the drawing. Therefore, if the layer provided at the position of the polyethylene terephthalate resin layer 33 is a soft material layer, the spacer S for forming the void 12 is buried in the soft material layer, and as a result, the void 12 disappears. This is because there is a risk of it.

  From this point of view, when a layer of another material is formed instead of the polyethylene terephthalate resin layer 33, it is preferable to form a layer of a material having a hardness equal to or higher than that of the polyethylene terephthalate resin.

Second Embodiment
FIG. 2 is a schematic cross-sectional view of a solar cell module according to a second embodiment of the present invention.

  In FIG. 2, the same components as those of the solar cell module 100 according to the first embodiment of the present invention shown in FIG. Moreover, the description about the same structure as the solar cell module 100 according to the first embodiment is omitted.

(Second colored layer)
As shown in FIG. 2, the second colored layer 21 in the solar cell module 200 according to the present embodiment is not a so-called solid layer, but is provided as a partial pattern layer, and the pattern layer further has a dot shape. It is characterized by having.

  Thus, it is preferable at the point which can increase the quantity of the light which injects into the solar cell element 11 by making the 2nd colored layer 21 into a dot form.

  In addition, it is also preferable that the second colored layer 21 has a dot shape in that it can suppress a rapid voltage drop that occurs particularly when the average illuminance is low. That is, the solar cell of the present invention is assumed to be used in a room where a high degree of design is required, but the room is assumed to have relatively low illuminance. In such a low illuminance place, it is preferable to use a dye-sensitized solar cell element or an amorphous silicon solar cell element as the solar cell element 11. Here, when these solar cell elements 11 are used, the current value generated by the photoelectric conversion is proportional to the light intensity, and therefore the numerical value is controlled only by the average total light transmittance of the light receiving surface of the solar cell element 11. On the other hand, since the voltage value is non-linear, it is known that a voltage may drop suddenly when the intensity falls below a predetermined illuminance. Under such circumstances, by making the colored layer 21 in a dot shape, the illuminance of the light receiving surface of the solar cell element 11 can be partially reduced, but a portion with high illuminance can be created partially, Thereby, it is possible to suppress a rapid voltage drop.

  Here, since the second colored layer 21 in the present embodiment has a dot shape, it can be considered that the apparent density of the second colored layer 21 is reduced.

  The method for forming the dot-like second colored layer 21 is not particularly limited. For example, an AM (Amplitude modulation) screening method, an FM (Frequency Modulation) screening method, and a density gradation method are used. Can be mentioned.

  The AM screening method is a method of adjusting the apparent density by controlling the size of the dots, and can be realized by a gravure printing method, an AM screen printing method, a fixed head type inkjet printing method, or the like. In general, since the control of the dot size is easier than the control of the number of dots, this AM screening method can suppress variations in power generation characteristics between product lots of solar cell modules.

  The FM screening method is a method of adjusting the apparent density by controlling the number of dots, and can be realized by an FM screen printing method, a movable head type ink jet printing method, or the like. In general, the FM screening method can reduce the size of each dot compared to the AM screening method. Therefore, according to this FM screening method, the concentration of the second colored layer 21 can be finely adjusted. it can.

  The density gradation method is a method of adjusting the apparent density by controlling the level of the dot density, and can be realized by a sublimation thermal transfer printing method, an overprinting ink jet printing method, or the like. For example, by previously forming a solid colored layer on the portion where the second colored layer 21 is formed in advance, and forming the dot-shaped second colored layer 21 thereon, the solid colored layer The second colored layer 21 can make the dot density high or low. Moreover, according to this method, since the layer thickness of the 2nd colored layer 21 can be made thin, it can also suppress that light diffuses on the 2nd colored layer 21 surface.

  Moreover, as shown in FIG. 2, the 2nd colored layer 21 does not need to be formed over the whole light-receiving surface of the solar cell module 200, For example, like a design, a character, etc. according to the design to desire, it is partial. May be provided.

(Transparent layer)
As shown in FIG. 2, the solar cell module 200 according to the present embodiment is characterized in that a transparent layer 22 is provided between the diffusion layer 13 and the second colored layer 21. In the present invention, the diffusion layer 13 and the second colored layer are not necessarily laminated directly, and other layers such as the transparent layer 22 exist between them as in the present embodiment. Also good.

  By providing the transparent layer 22 in this way, the degree of freedom in the method of forming the second colored layer 21 is increased, and various second colored layers 21 can be formed in accordance with a desired design.

  The material of the transparent layer 22 is not particularly limited, and various transparent resins and glass can be appropriately selected and employed.

(Protective layer)
As shown in FIG. 2, the solar cell module 200 according to this embodiment is also characterized in that a protective layer 23 is provided on the second colored layer 21.

  By providing the protective layer 23 in this manner, the second colored layer 21 can be prevented from deteriorating or peeling off, and the second colored layer 21 can be protected. Even if a phenomenon that the dye contained in the second colored layer 21 floats on the surface of the second colored layer 21 due to thermal diffusion, that is, a so-called bleed out occurs, if the protective layer 23 is provided, the bleed out occurs. The pigment | dye which was made can be confined and the surface of the solar cell module 200 can also be prevented from being stained with the pigment.

  The material of the protective layer 23 is not particularly limited, and various transparent resins and glass can be appropriately selected and employed. In addition, in the case where the second colored layer 21 contains a dye, the dye is removed from sunlight by adding a weather resistance improver such as an ultraviolet absorber or an antioxidant to the protective layer 23. Can be protected.

<Third Embodiment>
FIG. 3 is a schematic cross-sectional view of a solar cell module according to a third embodiment of the present invention.

  In FIG. 3, the same components as those of the solar cell modules 100 and 200 according to the first and second embodiments of the present invention shown in FIG. Moreover, the description about the same structure as the solar cell modules 100 and 200 according to the first and second embodiments is omitted.

(Second transparent layer)
As shown in FIG. 3, the solar cell module 300 according to this embodiment is characterized in that a second transparent layer 24 is formed between second colored layers 21 and 21 provided as a pattern layer. doing.

  The transparent layer is not necessarily a single layer, and can be appropriately provided in a necessary portion. Thus, by providing the 2nd transparent layer 24 between the 2nd colored layers 21, these two layers can be formed integrally. That is, in one layer, the portion colored with the colorant can be the second colored layer 21, and the portion not colored with the colorant can be the second transparent layer 24.

<Fourth embodiment>
FIG. 4 is a schematic cross-sectional view of a solar cell panel according to the fourth embodiment of the present invention.

  In FIG. 4, the same components as those of the solar cell modules 100, 200, and 300 according to the first to third embodiments of the present invention shown in FIGS. Moreover, the description about the same structure as the solar cell module 100, 200, 300 according to the first to third embodiments is omitted.

  The solar cell panel 400 according to the present embodiment is composed of a plurality of solar cell solar cell modules. More specifically, the solar cell module includes two or more solar cell elements 11, 11... Arranged at intervals, and the light receiving surface side thermoplastic resin layer 30 sandwiching these solar cell elements 11, 11. And the back surface side thermoplastic resin layer 31, the polyethylene terephthalate resin layer 33 arrange | positioned on the light-receiving surface side thermoplastic resin layer 30, the back sheet | seat 34 arrange | positioned at the back surface of a solar cell module, the edge of the light-receiving surface of a solar cell module Each of the sealing material 35 disposed in the portion, the first colored layer 20 provided between the back sheet 34 and the back surface side thermoplastic resin layer 31, and further the diffusion layer 13 disposed on the light receiving surface side However, the back sheet 34 and the sealing material 35 are integrated by heat-sealing, and the integrated solar cell modules are arranged in parallel. In the aspect, the first colored layer 20 ′ is also provided between the solar cell module and the solar cell module, and the transparent layer 22 and the second colored layer 21 are provided on the entire light receiving surface side of the plurality of solar cell modules. Is characterized by being arranged.

  Thus, the technical idea of the solar cell module of the present invention can be applied to the solar cell panel 400 constituted by a plurality of solar cell modules. That is, as in this embodiment, one solar cell module and one second colored layer 21 do not necessarily have a one-to-one correspondence, and one transparent layer and a plurality of solar cell modules One second colored layer may correspond. By setting it as such an aspect, a several solar cell module can be handled as one panel, and it is advantageous in the installation to a large area.

  Furthermore, by providing the first colored layer 20 ′ between the solar cell modules constituting the solar cell panel, it is possible to prevent color unevenness caused by the solar cell modules, and a more advanced design. It becomes possible to impart sex. Here, in FIG. 4, the first colored layer 20 ′ is provided between the sealing material 35 and the transparent layer 22, but is not limited to this position, and when viewed from the light receiving surface side, As long as it is between solar cell modules, it may be provided at any position. For example, you may provide in the back surface side of a solar cell module, and the position between solar cell modules.

  In the present embodiment, the transparent layer 22 and the second colored layer 21 may be integrated with each other so as to be peelable from the sealing material 35. Thereby, the design formed by the second colored layer 21 can be exchanged, and the design can be changed with time, such as a poster.

<Fifth Embodiment>
FIG. 5 is a schematic cross-sectional view of a solar cell panel according to a fifth embodiment of the present invention.

  In addition, also in FIG. 5, the same code | symbol is attached | subjected about the same structure as embodiment shown in FIGS. 1-3 like the solar cell panel 400 concerning the said 4th Embodiment, and the description is abbreviate | omitted.

  The solar cell panel 500 according to the present embodiment is different from the solar cell panel 400 according to the fourth embodiment shown in FIG. 4 in that the solar cell module constituting the solar cell panel 500 does not have the first colored layer. Yes.

  When the space between the solar cell elements 11 constituting the solar cell panel 500 is not so conspicuous and the space between the solar cell modules is conspicuous, the first colored layer 20 ′ may be provided only between the solar cell modules. The design properties of the entire solar cell panel 500 can be improved.

  In the solar cell panel 500 according to the present embodiment, the second colored layer 21 and the protective layer 23 are disposed on the entire light receiving surface side of the plurality of solar cell modules constituting the solar cell panel 500, and the transparent layer 22 is disposed. In the point which is not, it differs from the solar cell panel 400 concerning 4th Embodiment shown in the said FIG.

  As described above, the transparent layer 22 is not necessarily provided because it is an arbitrary layer, and the second colored layer 21 can be protected by providing the protective layer 23.

<Other embodiment 1>
In the fourth embodiment, “the transparent layer 22 and the second colored layer 21 may be integrated and peelable from the sealing material 35”, but in any of the first to fifth embodiments. However, the present invention is not limited to this, and the diffusion layer 13 may be peeled off in addition to the transparent layer 22 and the second colored layer 21. As in the fourth embodiment, the design can be exchanged, and can be exchanged when the second colored layer is deteriorated.

<Other embodiment 2>
Although not shown, the second colored layer 21 is provided at a position overlapping the solar cell element 11, and a dye is used for coloring the second colored layer 21, and the same color as the solar cell element 11 is used. Good. Thereby, since the same color solar cell element 11 and the 2nd colored layer 21 overlap, the said color can be made clear. In addition, since a dye is used for coloring the second colored layer 21, light other than the same color is transmitted, so the influence on power generation efficiency is low.

Example 1
The solar cell module of Example 1 of the present invention was produced in the following manner.

(Creation of solar cell elements and solar cell modules)
On a Ti foil (Takeuchi Metal Foil Industry Co., Ltd.) having a thickness of 50 μm as an electrode base material, 0.5% ethyl cellulose (STD-100: Nisshin Kasei Kogyo Co., Ltd.) in titanium oxide particles (P25: Nippon Aerosil Co., Ltd.) in ethanol (Company) was applied and dried. Subsequently, it roll-pressed at the speed of 1 m / min with the pressure of 0.5 t / cm using the roll small press machine, Then, it baked at 500 degreeC for 30 minutes, and obtained the layer for porous layer formation with a film thickness of 5 micrometers. .

  Next, a dye sensitizer solution in which 0.3 mM of N719 dye (Dyesol) was dissolved in acetonitrile / t-butanol = 1/1 solution was prepared, and the porous layer forming layer was added to the dye sensitizer solution. After being soaked for 20 hours, an oxide semiconductor electrode substrate having a size of 10 cm × 4 cm (deposition position: 9.5 cm × 4 cm) was produced.

Next, 6 mol / l hexyl methylimidazolium iodide (Toyama Pharmaceutical), 0.6 mol / l I ₂ (Merck Corporation), 0.45 mol / l n
-An electrolyte solution in which methyl benzimidazol (Aldrich) was dissolved in hexyl methyl imidazole tetraciano borate (Merck Co., Ltd.) was prepared. Next, a resin solution in which 0.5% ethyl cellulose (STD-100: Nisshin Kasei) was dissolved in ethanol at 10 wt% was prepared, and the resin electrolyte solution was mixed at the above electrolyte solution: resin solution = 1: 6 (weight ratio). Was made. This was applied to the oxide semiconductor electrode substrate with a Miya bar and heated at 120 ° C. for 10 minutes.

  Next, a 10 cm × 4 cm counter electrode was produced by depositing pt on the indium tin oxide film of a polyethylene naphthalate substrate on which 30 Ω / sq indium tin oxide was deposited to have a transmittance of 80%.

  Then, the oxide semiconductor electrode substrate with an electrolyte produced above and the counter electrode were bonded in a state of being shifted 5 mm above and below, and the electrode of one element and the counter electrode of the other element were connected with a metal tape.

  Next, on the light receiving surface side, a light receiving surface side thermoplastic resin layer (11 cm × 10 cm (ethylene-vinyl acetate copolymer resin film 400 μm: manufactured by Tamapoly), polyethylene terephthalate resin layer (10 cm × 9 cm (Lumirror T60: manufactured by Toray)) And a diffusion layer (10 cm × 9 cm (D123: manufactured by Tsujiden)) and a wood-tone wallpaper sheet (10 cm × 9 cm) having an average transmittance of 77% as the second colored layer, while receiving light on the back side Surface side thermoplastic resin layer (11 cm × 10 cm (ethylene-vinyl acetate copolymer resin film 400 μm: made by Tamapoly)) and sealing material (aluminum zip zip) having a barrier property capable of thermally laminating the outer peripheral part (non-power generation part) of the element : Asone), and the back side has a black resin (11 cm × 10 cm) laminated as the first colored layer. A sheet (12 cm × 11 cm (aluminum lami zip: as one)) was placed and heat laminated at 120 degrees to produce the solar cell module of Example 1. The surface of the diffusion layer that is in contact with the polyethylene terephthalate resin is convex. There was a gap between the diffusion layer and the polyethylene terephthalate resin layer because the diffusion layer was thermally laminated only at the outer periphery of the element.

(Measurement of Example 1)
It was as follows when the battery performance of the solar cell module of Example 1 and the design of the light-receiving surface were measured.
-Photoelectric conversion efficiency: 1.7%
・ Output characteristics: Open voltage 1.5V
-Light receiving surface design: clean woodgrain.

(Comparative Example 1)
A solar cell module of Comparative Example 1 was produced under the same conditions except that the first colored layer in Example 1 was not provided.

(Measurement of Comparative Example 1)
It was as follows when the battery performance of the solar cell module of the comparative example 1 and the design of the light-receiving surface were measured.
-Photoelectric conversion efficiency: 1.7%
・ Output characteristics: Open voltage 1.5V
-Light-receiving surface design: A slight white stripe shape was confirmed along with the wood grain, and a clean wood-grain design could not be confirmed.

(Evaluation)
From the measurement results of the solar cell modules of Example 1 and Comparative Example 1, it can be seen that according to the solar cell module of the present invention, it is possible to impart design properties superior to conventional ones without reducing the photoelectric conversion efficiency. It was.

100, 200, 300 ... solar cell module 400, 500 ... solar cell panel 11 ... solar cell element 12 ... gap 13 ... diffusion layer 20, 20 '... first colored layer 21 ... second colored layer 22 ... transparent layer 30 ... light reception Surface side thermoplastic resin layer 31 ... Back side thermoplastic resin layer 33 ... Polyethylene terephthalate resin layer 34 ... Back sheet 35 ... Sealing material

Claims (7)

A solar cell module having two or more solar cell elements arranged at intervals,
Between the solar cell element and the solar cell element, a first colored layer of the same color as the solar cell element is provided,
The solar cell module is characterized in that a diffusion layer and a second colored layer are provided in this order directly or via another layer on the light receiving surface side of the solar cell module from the solar cell element side. .   The solar cell module according to claim 1, wherein the second colored layer has a dot shape.   The solar cell module according to claim 1, wherein a transparent layer is provided between the diffusion layer and the second colored layer.   The solar cell module according to any one of claims 1 to 3, wherein the second colored layer contains a dye.   The solar cell module according to claim 1, wherein a protective layer is provided on the second colored layer. A solar cell panel having two or more solar cell modules arranged at intervals,
The solar cell module has two or more solar cell elements,
Between the solar cell element and the solar cell element in the solar cell module, and between the solar cell module and the solar cell module, a first colored layer having the same color as the at least one solar cell element is provided,
A solar cell panel, wherein a diffusion layer and a second colored layer are provided directly or via another layer in this order from the solar cell element side on the light receiving surface side of the solar cell panel . A solar cell panel having two or more solar cell modules arranged at intervals,
The solar cell module has two or more solar cell elements,
Between the solar cell module and the solar cell module, a first colored layer having the same color as the at least one solar cell element is provided,
A solar cell panel, wherein a diffusion layer and a second colored layer are provided directly or via another layer in this order from the solar cell element side on the light receiving surface side of the solar cell panel .

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