Solar cell module

Abstract

To provide a solar cell module with which it is possible to suppress the occurrence of a black or a dark blue color on the external appearance of the solar cell module and suppress a decrease in power generation efficiency.SOLUTION: A solar cell module 1 includes a vapor deposition layer 102 located on the light receiving side of a solar cell SC and formed by vapor deposition of metal. The vapor deposition layer 102 has the function to pass the sunlight needed for solar cell power generation through and yet make the black or the dark blue color due to the solar cell SC hardly visible. Therefore, by disposing the vapor deposition layer 102 on the light receiving side of the solar cell SC it is possible to suppress the occurrence of a black or a dark blue color on the external appearance of the solar cell module 1. Thus, it is made possible to suppress the occurrence of a black or a dark blue color on the external appearance of the solar cell module 1 and suppress a decrease in power generation efficiency.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a solar cell module. [Background technology]

[0002] With the aim of achieving carbon neutrality and a carbon-free society by 2050, there is a demand for the widespread use of ZEBs (Net Zero Energy Buildings), which can significantly reduce energy consumption in buildings. A ZEB is a building that aims to achieve a zero balance of annual primary energy consumption while realizing a comfortable indoor environment. Since people are active inside a building, it is impossible to reduce energy consumption to zero completely, but it is possible to reduce energy consumption to zero on a net basis by reducing energy consumption through energy conservation and generating the amount of energy used through energy generation.

[0003] Energy generation methods that do not use fossil fuels include, for example, solar power generation, wind power generation, biomass power generation, etc. As an energy generation method for buildings, solar power generation is suitable when taking into account installation space and costs.

[0004] The rooftop area of ​​buildings is taken up by outdoor units for air conditioning and other equipment, so in order to generate electricity, it was necessary to install solar cell modules on the walls as well as on the roof. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-27266 Summary of the Invention [Problem to be solved by the invention]

[0006] As in the solar cell module shown in the cited document 1, printed matter may be combined with solar cells to impart a design. Instead of such printed matter, or in addition to printed matter, a method for suppressing the black or dark blue color of solar cells from appearing on the exterior of a solar cell module has been required. In addition, since solar cell modules generate electricity by receiving sunlight, there is a problem that if the sunlight is blocked excessively by the printed matter, the power generation efficiency decreases.

[0007] The present invention is intended to solve the above-mentioned problems, and aims to provide a solar cell module that can prevent the appearance of black or dark blue color on the exterior of the solar cell module and can prevent a decrease in power generation efficiency. [Means for solving the problem]

[0008] [1] According to one aspect, a solar cell module of the present invention includes a solar cell and a deposition layer disposed on a light-receiving surface side of the solar cell and formed by deposition of a metal.

[0009] The above-mentioned solar cell module is provided with a deposition layer disposed on the light receiving surface side of the solar cell and formed by deposition of metal. The deposition layer has the function of making black and dark blue colors less visible while allowing sunlight necessary for solar power generation to pass through. Therefore, by disposing the deposition layer on the light receiving surface side of the solar cell, it is possible to prevent black and dark blue colors from appearing on the exterior of the solar cell module. As a result, it is possible to prevent black and dark blue colors from appearing on the exterior of the solar cell module and to prevent a decrease in power generation efficiency.

[0010] [2] The solar cell module of [1] above further includes a decorative printed layer disposed on the outer layer side of the deposition layer with respect to the light receiving surface, thereby making it possible to impart design to the solar cell module with the printed layer while suppressing the appearance of black or dark blue in the external appearance of the solar cell module.

[0011] [3] The solar cell module of [2] above, wherein the printed layer has a first color pattern layer composed of a plurality of first color dots, and a second color pattern layer provided on the first color pattern layer and composed of a plurality of second color dots, each of the plurality of first color dots including a first color binder and a plurality of first color pigment chips dispersed within the first color binder, each of the plurality of second color dots including a second color binder and a plurality of second color pigment chips dispersed within the second color binder, one of the plurality of first color pigment chips and the plurality of second color pigment chips is a first interference pigment of a plurality of colors that respectively generate first interference lights different from each other, and the other of the plurality of first color pigment chips and the plurality of second color pigment chips is a second interference pigment that generates a monochromatic second interference light different from the mixed color exhibited by the plurality of first interference pigments, and the plurality of first interference lights and the second interference lights are additively mixed. In this case, since either the first color pattern layer or the second color pattern layer contains an interference pigment of multiple colors that generate different interference lights, a three-dimensional pattern can be realized even with a small number of printed layers. Furthermore, in this printed matter, the pattern layer containing the interference pigment that generates multiple interference lights can be either the first color pattern layer or the second color pattern layer, so that color matching and registration work during printing can be simplified. Therefore, according to this printed matter, a three-dimensional pattern can be expressed even with a small number of printed layers, and color matching and registration work during printing can be simplified. Furthermore, while obtaining these effects, the printed matter can ensure the transmittance of sunlight to the solar cell, thereby suppressing a decrease in the power generation efficiency of the solar cell module.

[0012] [4] In any of the solar cell modules [1] to [3] above, a film layer may be provided as the outermost layer for the light receiving surface. In this case, the surface of the solar cell module can be protected by the film layer. Also, by making the film layer the outermost layer, the deposition surface can be protected. Furthermore, in the case where a printed layer is provided, it is possible to obtain the advantage of protecting the printed layer which is made of color pigment chips and has gaps and is brittle.

[0013] [5] The solar cell module according to any one of [1] to [3] above may have a topcoat layer as the outermost layer on the light receiving surface. In this case, the surface of the solar cell module can be protected by the topcoat layer. In addition, by making the topcoat layer the outermost layer, it is possible to obtain the advantages of facilitating gloss adjustment and reducing the risk of scratches during construction.

[0014] [6] The solar cell module according to any one of the above [1] to [3] may have a glass layer as the outermost layer on the light receiving surface. In this case, the surface of the solar cell module can be protected by the glass layer. In addition, by using the glass layer as the outermost layer, it is possible to obtain the advantage of retarding deterioration due to excellent gas barrier properties.

[0015] [7] In the solar cell module of any one of [1] to [6] above, the total light transmittance of the deposition layer may be 25% to 75%. In this case, the appearance of the solar cell module can be prevented from being black or dark blue. On the other hand, the power generation efficiency of the solar cell can be prevented from being excessively decreased. Effect of the Invention

[0016] According to the present invention, it is possible to provide a solar cell module that can suppress the appearance of a black or dark blue color in the external appearance of the solar cell module and can suppress a decrease in power generation efficiency. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a cross-sectional view illustrating a schematic configuration of a solar cell module according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view illustrating a schematic configuration of a solar cell module according to a second embodiment. [Diagram 3] FIG. 3 is a cross-sectional view illustrating a solar cell module according to a third embodiment. [Figure 4] FIG. 4 is a cross-sectional view that illustrates a printed layer included in the solar cell module illustrated in FIG. [Diagram 5]FIG. 5 is a cross-sectional view that illustrates a pattern printed layer included in the printed matter illustrated in FIG. [Figure 6] FIG. 6 is a cross-sectional view that illustrates another printed layer. [Figure 7] FIG. 7 is a cross-sectional view that illustrates a white pattern layer included in the printed matter illustrated in FIG. [Figure 8] FIG. 8 is a cross-sectional view that illustrates another printed layer. [Figure 9] FIG. 9 is a cross-sectional view that illustrates another printed layer. [Figure 10] FIG. 10 is a cross-sectional view that illustrates a solar cell module according to a fourth embodiment. [Figure 11] FIG. 11 is a cross-sectional view illustrating a schematic configuration of a solar cell module according to a fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Specific examples of solar cell modules according to embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to these examples, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. In the following description, the same elements in the description of the drawings will be given the same reference numerals, and duplicate descriptions will be omitted.

[0019] [First embodiment] Generally, the surfaces of the solar cells embedded in a solar cell module are only black or dark blue in color, and therefore attempts have been made to color the exterior of the solar cell module in various ways in order to improve its design. In this embodiment, a printed material is applied to the surface of the solar cell module in a manner that makes it possible to improve the design of the exterior of the solar cell module while keeping the decrease in power generation of the solar cell very low.

[0020] Fig. 1 is a cross-sectional view showing a schematic diagram of a solar cell module according to a first embodiment. As shown in Fig. 1, the solar cell module 1 includes a backing material 100, a sealing material layer 111, a solar cell SC, and a surface layer 120. The surface layer 120 includes a film layer 101, a deposition layer 102, and an adhesive layer 103. A thin solar cell SC is placed on the backing material 100 with its light-receiving surface facing upward and embedded in the sealing material layer 111. The surface layer 120 is formed on the light-receiving surface side of the solar cell SC.

[0021] The solar cell SC may be a photoelectric conversion element formed in a thin plate shape with a thickness of about 0.2 mm of crystalline or amorphous silicon, thin film silicon, perovskite, chalcopyrite, III-V, CdTe, CIS, etc., which generates electricity by absorbing light with wavelengths mainly in the visible light region. The encapsulant layer 111 may be formed in a layer shape with a thickness of about 1 mm, surrounding the solar cell SC, as shown in the figure, using a transparent material such as ethylene vinyl acetate (EVA), polyvinyl butyral (PVB), polyolefin resin, ionomer resin, silicone resin, etc.

[0022] The backing material 100 may be a layer, film, or plate made of PET (polyethylene terephthalate), polycarbonate resin, acrylic resin, glass, or metal (aluminum, etc.). The front plate 112 may be a plate-like member made of a transparent material such as polycarbonate resin, acrylic resin, or glass and having a thickness of about 3 mm. The front plate 112 and the sealant layer 111, and the backing material 100 and the sealant layer 111 may be bonded together by the adhesive strength of the sealant layer 111.

[0023] The deposition layer 102 is disposed on the light receiving surface side of the solar cell SC and is formed by deposition of a metal. The deposition layer 102 is a layer for hiding the black or dark blue color of the solar cell SC side while transmitting sunlight to the solar cell SC. The metal of the deposition layer 102 may be aluminum, indium, tin, or other metals such as zinc, chromium, nickel, gold, and silver. When aluminum is used as the metal of the deposition layer, it has the advantage of being inexpensive. When indium is used as the metal of the deposition layer 102, it has the advantage of being highly durable. When tin is used as the metal of the deposition layer, it has the advantage of being non-conductive. The deposition layer 102 may be a film formed in advance by deposition. Alternatively, it may be formed by performing a sputtering process or the like on another member (here, the film layer 101) in the surface layer 120. The thickness of the deposition layer 102 may be 10 to 100 nm, preferably 15 to 60 nm, and more preferably 20 to 50 nm.

[0024] In this embodiment, the film layer 101 is disposed as the outermost layer for the solar cell SC. The film layer 101 is disposed on the main surface on the outer layer side of the deposition layer 102. The film layer 101 has a function of protecting other members of the surface layer 120 (here, the deposition layer 102). As a material for the film layer 101, for example, an acrylic resin, a fluororesin, a polypropylene resin, a polyester resin, or the like may be adopted. The thickness of the film layer 101 may be 30 to 200 μm, preferably 40 to 180 μm, and more preferably 50 to 150 μm.

[0025] The adhesive layer 103 is disposed between the main surface of the sealing material layer 111 and the deposition layer 102. The adhesive layer 103 is a layer for adhering the deposition layer 102 to the main surface of the sealing material layer 111. For example, a silicone resin, an acrylic resin, an epoxy resin, or the like may be used as the material of the adhesive layer 103. The thickness of the adhesive layer 103 may be 30 to 300 μm, preferably 40 to 200 μm, and more preferably 50 to 150 μm.

[0026] Here, the total light transmittance will be described. The total light transmittance of the deposition layer 102 may be 25% to 75%. In particular, in order to suppress a decrease in the power generation efficiency of the solar cell module 1, the total light transmittance of the deposition layer 102 may be 25% or more. In addition, in order to suppress a black or dark blue color appearing in the appearance of the solar cell module 1, the total light transmittance of the deposition layer 102 may be 75% or less. The total light transmittance referred to here means a value measured using a spectrophotometer (for example, spectrophotometer UV-3600 manufactured by Shimadzu Corporation).

[0027] Next, the functions and effects of the solar cell module 1 according to this embodiment will be described.

[0028] The solar cell module 1 according to this embodiment is disposed on the light receiving surface side of the solar cell SC and includes a deposition layer 102 formed by deposition of metal. The deposition layer 102 has a function of making the black or dark blue color of the solar cell SC and the like less visible while allowing sunlight necessary for solar power generation to pass through. Therefore, by disposing the deposition layer 102 on the light receiving surface side of the solar cell SC, it is possible to prevent the appearance of black or dark blue in the appearance of the solar cell module 1. As a result, it is possible to prevent the appearance of black or dark blue in the appearance of the solar cell module 1 and to prevent a decrease in power generation efficiency.

[0029] The solar cell module 1 may include a film layer 101 as the outermost layer for the light receiving surface. In this case, the surface of the solar cell module 1 can be protected by the film layer 101. Also, by making the film layer 101 the outermost layer, the deposition surface can be protected. Note that when the solar cell module 1 includes a printed layer 2 described below, it is possible to obtain the advantage of protecting the printed layer 2, which is made of color pigment chips and has gaps and is brittle.

[0030] In the solar cell module 1, the total light transmittance of the vapor deposition layer 102 may be 25% to 75%. In this case, it is possible to prevent the appearance of black or dark blue in the solar cell module 1. On the other hand, it is possible to prevent the power generation efficiency of the solar cell SC from decreasing excessively.

[0031] [Second embodiment] In the following, a solar cell module 1 according to the second embodiment will be described with reference to Fig. 2. In the description of the second embodiment, descriptions that overlap with the first embodiment will be omitted, and only differences from the first embodiment will be described. In other words, the descriptions of the first embodiment may be used appropriately in the second embodiment to the extent technically possible.

[0032] 2 is a cross-sectional view illustrating a solar cell module 1 according to the second embodiment. As illustrated in FIG. 2, the solar cell module 1 according to the second embodiment includes a protective layer 104A on the outer side of the film layer 101.

[0033] A topcoat layer 104A may be used as the protective layer 104. The topcoat layer 104A may be the same as that applied to the painted surface of a vehicle or the like. The thickness of the topcoat layer 104A may be 5 to 50 μm, preferably 10 to 40 μm, and more preferably 15 to 30 μm. The material of the topcoat layer 104A may be an active energy ray curable coating composition or a heat curable coating composition that is cured by ultraviolet irradiation or electron beams, etc.

[0034] In this way, the solar cell module 1 may include the top coat layer 104A as the outermost layer on the light receiving surface. In this case, the surface of the solar cell module 1 can be protected by the top coat layer 104A. Furthermore, by making the top coat layer 104A the outermost layer, it is possible to obtain the advantages of facilitating gloss adjustment and reducing the risk of scratches during construction. In addition, it is possible to obtain the advantage of protecting the film layer 101 from ultraviolet rays.

[0035] Furthermore, a glass layer 104B may be adopted as the protective layer 104. As the glass layer 104B, for example, a type of glass such as soda-lime glass or aluminoborosilicate glass is adopted, and the thickness of the glass layer 104B may be 2.0 to 5.0 mm, preferably 2.5 to 4.0 mm, and more preferably 2.5 to 3.0 mm.

[0036] The solar cell module 1 may include a glass layer 104B as the outermost layer for the light receiving surface. In this case, the surface of the solar cell module 1 can be protected by the glass layer 104B. Furthermore, by making the glass layer 104B the outermost layer, it is possible to obtain an advantage that deterioration is delayed due to excellent gas barrier properties. It is also possible to obtain an advantage that the film layer 101 is protected from scratches.

[0037] [Third embodiment] In the following, a solar cell module 1 according to the third embodiment will be described with reference to Fig. 3. In the description of the third embodiment, descriptions that overlap with the first and second embodiments will be omitted, and only differences from the first and second embodiments will be described. In other words, the descriptions of the first and second embodiments may be used appropriately in the second embodiment to the extent technically possible.

[0038] Fig. 3 is a cross-sectional view showing a schematic diagram of a solar cell module 1 according to a third embodiment. As shown in Fig. 3, the solar cell module 1 according to the third embodiment includes a decorated printed layer 2 between a deposition layer 102 and a film layer 101.

[0039] As shown in FIG. 4, the printed layer 2 is a sheet for expressing a pattern, and includes a light-transmitting base material 4, a pattern printed layer 5, and a transmissive smoke printed layer 30.

[0040] The light-transmitting substrate 4 is a substrate having visible light transmissibility. The light-transmitting substrate 4 is made of, for example, a transparent resin. Examples of the transparent resin include PET, PMMA, polyethylene, polypropylene, nylon, and fluorine. The light-transmitting substrate 4 may be a glass substrate. The light-transmitting substrate 4 has a thickness of, for example, 25 μm to 250 μm. In the case of a glass substrate, the thickness is, for example, several mm to about 10 mm. If necessary, a surface protection layer may be provided on the surface side of the light-transmitting substrate 4 (the side opposite to the picture print layer 5).

[0041] The picture-printed layer 5 is a layer that expresses the picture of the printed layer 2. The picture-printed layer 5 includes a first color pattern layer 10 provided on one surface 4a of the light-transmitting base material 4, and a second color pattern layer 20 provided on the first color pattern layer 10.

[0042] The first color pattern layer 10 can be provided on the surface 4a by, for example, screen printing, inkjet printing, gravure printing, or offset printing. As shown in FIG. 5, the first color pattern layer 10 is composed of a plurality of first color dots 11. Here, the "dot" means a point that is an element that constitutes a printed image, and the shape is not limited to a circle, and may be a rectangle, a polygon, or other shape. Each of the plurality of first color dots 11 includes a first color binder 12 and a plurality of first color pigment chips 13 dispersed inside the first color binder 12. The content of the plurality of first color pigment chips 13 is, for example, in the range of 0.5 parts by weight to 20 parts by weight, when the first color binder 12 is 100 parts by weight.

[0043] Examples of the first color binder 12 include vinyl resins, acrylic resins, thermoplastic urethane resins, polyester resins, polycarbonate resins, and fluorine resins. The thickness of the first color pattern layer 10 is, for example, 1 μm to 10 μm. The first color pattern layer 10 may contain a curing agent. In this case, the heat resistance of the first color pattern layer 10 and the adhesion of the first color pattern layer 10 to the light-transmitting substrate 4 can be improved.

[0044] The first color pigment chips 13 are first interference pigments 14a and 14b of multiple colors that generate different interference lights. Each of the first interference pigments 14a and 14b is composed of a flake (not shown) that is transparent to visible light and a metal oxide film (not shown) that covers the flake. The light reflected on the surface of the metal oxide film out of the light incident on the first color pattern layer 10 from the translucent substrate 4 side interferes with the light that passes through the metal oxide film and is reflected on the surface of the flake, generating interference light. By adjusting the film thickness and the refractive index of the metal oxide film, interference light having a desired wavelength can be generated.

[0045] Each of the first interference pigments 14a and 14b is a titanium dioxide-coated mica. The particle size range of the titanium dioxide-coated mica includes, for example, a range of 25 μm to 60 μm. Here, the "particle size" means the longest diameter of the particle cross section. The flakes constituting the first interference pigments 14a and 14b may be other than mica, for example, silica, alumina, glass, or polysilicate. The metal oxide film constituting the first interference pigments 14a and 14b may be other than titanium dioxide, for example, zirconium oxide, zinc oxide, iron oxide, or tin oxide.

[0046] When the incident light E is incident on the first color pattern layer 10, the first interference pigments 14a and 14b generate first interference lights 15a and 15b that are different from each other. That is, the wavelengths of the first interference lights 15a and 15b are different from each other. As a result, the first interference pigments 14a and 14b exhibit a mixed color. The first interference pigments 14a and 14b are, for example, a red interference pigment (red pearl pigment) and a gold interference pigment (gold pearl pigment), respectively. In this case, the first interference lights 15a and 15b exhibit red and gold, respectively. The blending amounts of the first interference pigments 14a and 14b may be the same or different from each other.

[0047] The second color pattern layer 20 can be provided on the first color pattern layer 10 by, for example, screen printing, inkjet printing, gravure printing, or offset printing. As shown in FIG. 5, the second color pattern layer 20 is composed of a plurality of second color dots 21. Here, the "dot" means a point that is an element that constitutes a printed image, and the shape is not limited to a circle, and may be a rectangle, a polygon, or other shape. Each of the plurality of second color dots 21 includes a second color binder 22 and a plurality of second color pigment chips 23 dispersed inside the second color binder 22. The content of the plurality of second color pigment chips 23 is, for example, in the range of 0.5 parts by weight to 20 parts by weight, when the second color binder 22 is 100 parts by weight.

[0048] Examples of the second color binder 22 include vinyl resins, acrylic resins, thermoplastic urethane resins, polyester resins, polycarbonate resins, and fluorine resins. The thickness of the second color pattern layer 20 is, for example, 1 μm to 10 μm. The second color pattern layer 20 may contain a curing agent. In this case, the heat resistance of the second color pattern layer 20 and the adhesion of the second color pattern layer 20 to the first color pattern layer 10 can be improved.

[0049] The second color pigment chips 23 are second interference pigments 24 that generate monochromatic interference light different from the mixed color of the first interference pigments 14a and 14b. The second interference pigment 24 is composed of a thin flake (not shown) that is transparent to visible light, and a metal oxide film (not shown) that covers the thin flake. The light that is reflected on the surface of the metal oxide film out of the light incident on the second color pattern layer 20 from the translucent substrate 4 side interferes with the light that passes through the metal oxide film and is reflected on the surface of the flake, generating interference light. By adjusting the film thickness and the refractive index of the metal oxide film, interference light having a desired wavelength can be generated.

[0050] The second interference pigment 24 is a titanium dioxide-coated mica. The particle size range of the titanium dioxide-coated mica includes, for example, a range of 25 μm or more and 60 μm or less. Here, the "particle size" means the longest diameter of the particle cross section. The flakes constituting the second interference pigment 24 may be other than mica, for example, silica, alumina, glass, or polysilicate. The metal oxide film constituting the second interference pigment 24 may be other than titanium dioxide, for example, zirconium oxide, zinc oxide, iron oxide, or tin oxide.

[0051] When the incident light E is incident on the second color pattern layer 20, the second interference pigment 24 generates a monochromatic second interference light 25. As a result, the second interference pigment 24 exhibits a monochromatic color. The second interference pigment 24 may be an interference pigment that generates a monochromatic second interference light 25 different from the mixed color exhibited by the first interference pigments 14a and 14b, and may be, for example, a green interference pigment (green pearl pigment). In this case, the second interference light 25 exhibits green color.

[0052] The transparent smoke printed layer 30 has a function of attenuating light from the front side of the viewpoint that passes through the printed layer 2. The transparent smoke printed layer 30 is provided on the outermost surface of the picture printed layer 5 on the opposite side to the light-transmitting substrate 4. In the first embodiment, the transparent smoke printed layer 30 is provided on the second color pattern layer 20 as shown in FIG. 4. The transparent smoke printed layer 30 can be provided on the second color pattern layer 20 by, for example, screen printing, inkjet printing, gravure printing, or offset printing using an ink in which a small amount of carbon black is dispersed in a resin binder such as a vinyl-based, acrylic-based, urethane-based, or polyester-based resin binder. The thickness of the transparent smoke printed layer 30 is, for example, 1 μm to 10 μm. The transparent smoke printed layer 30 may be omitted.

[0053] In the print layer 2, the first interference light 15a, 15b generated by the first interference pigments 14a, 14b and the second interference light 25 generated by the second interference pigment 24 are additively mixed to express a pattern.

[0054] The total light transmittance of the printed layer 2 is, for example, 50% to 80%. In particular, it may be 60% or more in order to suppress a decrease in the power generation efficiency of the solar cell module 1. The total light transmittance referred to here means a value measured using a spectrophotometer (for example, spectrophotometer UV-3600 manufactured by Shimadzu Corporation).

[0055] As described above, the solar cell module further includes a decorated printed layer disposed on the outer layer side of the deposition layer with respect to the light receiving surface, and therefore, the printed layer can impart design to the solar cell module while suppressing the appearance of black or dark blue in the solar cell module's appearance.

[0056] In addition, in the printing layer 2, the first color pattern layer 10 contains the first interference pigments 14a and 14b, and the second color pattern layer 20 contains the second interference pigment 24, so that a three-dimensional pattern can be realized even with a small number of printing layers. Furthermore, in the printing layer 2, the first color pattern layer 10 is the only pattern layer among the first color pattern layer 10 and the second color pattern layer 20 that contains interference pigments that generate different interference lights, so that color matching and registration work during printing can be simplified. Therefore, according to the printing layer 2, a three-dimensional pattern can be expressed even with a small number of printing layers, and color matching and registration work during printing can be simplified. In addition, the printing layer 2 can suppress a decrease in the power generation efficiency of the solar cell module 1 by ensuring the transmittance of sunlight to the solar cell SC while obtaining these effects.

[0057] The printed layer 2 of the solar cell module 1 includes a transparent smoke printed layer 30 provided on the second color pattern layer 20. This provides better color development between the first color pattern layer 10 and the second color pattern layer 20. Furthermore, since the transparent smoke printed layer 30 has transparency, a decrease in the power generation efficiency of the solar cell module 1 is effectively suppressed.

[0058] Each of the first interference pigments 14a, 14b and the second interference pigment 24 contains titanium dioxide-coated mica having a particle size of 25 μm or more and 60 μm or less. When titanium dioxide-coated mica having a particle size of 25 μm or more is contained, the transparency and color development of the picture-printed layer 5 can be improved. When titanium dioxide-coated mica having a particle size of 60 μm or less is contained, a decrease in the resolution and gradation of the picture-printed layer 5 can be suppressed.

[0059] The content of the plurality of first color pigment chips 13 is within a range of 0.5 parts by weight to 20 parts by weight when the first color binder 12 is taken as 100 parts by weight, and the content of the plurality of second color pigment chips 23 is within a range of 0.5 parts by weight to 20 parts by weight when the second color binder is taken as 100 parts by weight. Since the content of the plurality of first color pigment chips 13 is within a range of 0.5 parts by weight or more, the pattern of the first color pattern layer 10 is expressed well. Since the content of the plurality of first color pigment chips 13 is within a range of 20 parts by weight or less, the coating property and transparency of the first color pattern layer 10 can be suppressed from decreasing. Similarly, since the content of the plurality of second color pigment chips 23 is within a range of 0.5 parts by weight to 20 parts by weight when the second color binder 22 is taken as 100 parts by weight, the pattern of the second color pattern layer 20 is expressed well, while the coating property and transparency of the second color pattern layer 20 can be suppressed from decreasing.

[0060] The total light transmittance of the printed layer 2 is 50% to 80%. If the total light transmittance is 60% or more, when the printed layer 2 is placed in front of the solar cell SC, the picture printed layer 5 becomes difficult to see due to the light of the image on the screen, and the image is seen more clearly. If the total light transmittance is 80% or less, the picture on the picture printed layer 5 can be prevented from appearing dark even if the screen is black.

[0061] Another printed layer 2A will be described with reference to Figs. 6 and 7. Fig. 6 is a cross-sectional view that shows a schematic representation of the printed layer 2A. Fig. 7 is a cross-sectional view that shows a schematic representation of the white pattern layer provided in the printed layer 2A shown in Fig. 6. The printed layer 2A includes a light-transmitting substrate 4 and a picture printed layer 5. The printed layer 2A further includes a white pattern layer 40 provided on the second color pattern layer 20.

[0062] The white pattern layer 40 can be provided on the second color pattern layer 20 by, for example, screen printing, inkjet printing, gravure printing, or offset printing. As shown in FIG. 7, the white pattern layer 40 is composed of a plurality of silver dots 41. Here, the "dot" means a point that is an element that constitutes a printed image, and the shape is not limited to a circle, but may be a rectangle, a polygon, or other shape. Each of the plurality of silver dots 41 contains a silver binder 42 and a plurality of silver pigment chips 43 dispersed inside the silver binder 42. The content of the plurality of silver pigment chips 43 is, for example, in the range of 0.5 parts by weight to 20 parts by weight, when the silver binder 42 is 100 parts by weight.

[0063] Examples of the silver binder 42 include vinyl resins, acrylic resins, thermoplastic urethane resins, polyester resins, and polycarbonate resins. The thickness of the white pattern layer 40 is, for example, 1 μm to 10 μm. The white pattern layer 40 may contain a hardener. In this case, the heat resistance of the white pattern layer 40 and the adhesion of the white pattern layer 40 to the second color pattern layer 20 can be improved.

[0064] The above-described configuration of the printed layer 2A also provides the same effects as those of the previously described printed layer 2. Furthermore, the white pattern layer 40 is provided on the second color pattern layer 20 and is composed of a plurality of silver dots 41, and each of the plurality of silver dots 41 contains a silver binder 42 and a plurality of silver pigment chips 43 dispersed within the silver binder 42. This provides excellent color development for the first color pattern layer 10 and the second color pattern layer 20, and allows the picture printed layer 5 to have a picture that gives a whitish impression.

[0065] Another printed layer 2B will be described with reference to Fig. 8. Fig. 8 is a cross-sectional view showing a schematic view of the printed layer 2B. The printed layer 2B includes a light-transmitting base material 4 and a picture printed layer 5. In other words, the printed layer 2B does not include a translucent smoke printed layer 30 and a white pattern layer 40. Even with the configuration of the printed layer 2B described above, the same effects as those of the printed layer 2 can be achieved.

[0066] Another printed layer 2C will be described with reference to FIG. 9. FIG. 9 is a cross-sectional view showing a schematic view of the printed layer 2C. The printed layer 2C includes a light-transmitting substrate 4, a picture printed layer 5, a white pattern layer 40, and a transmissive smoke printed layer 30. The white pattern layer 40 is provided on the second color pattern layer 20, and the transmissive smoke printed layer 30 is provided on the white pattern layer 40. Even with the configuration of the printed layer 2C described above, the same action and effect as the other printed layers can be achieved.

[0067] The solar cell module according to the present invention is not limited to the above-mentioned embodiment, and various other modifications are possible. For example, the second color pattern layer may include a first interference pigment of multiple colors that generate different first interference lights, and the first color pattern layer may include a second interference pigment that generates a single-color second interference light that is different from the mixed color exhibited by the multiple first interference pigments. In addition, in each of the above-mentioned embodiments, the first color pigment chip is a first interference pigment of two colors, but the first color pigment chip may be a first interference pigment of three or more colors.

[0068] The print layer may be formed using a pigment, such as an inorganic pigment, such as titanium oxide, zinc oxide, carbon black, iron / composite oxide, iron oxide, or ultramarine, or an organic pigment, such as isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, or phthalocyanine.

[0069] [Fourth embodiment] In the following, a solar cell module 1 according to the fourth embodiment will be described with reference to Fig. 10. In the description of the fourth embodiment, descriptions that overlap with the first to third embodiments will be omitted, and only differences from the first to third embodiments will be described. In other words, the descriptions of the first to fourth embodiments may be used as appropriate in the fourth embodiment to the extent technically possible.

[0070] Fig. 10 is a cross-sectional view showing a schematic diagram of a solar cell module 1 according to a fourth embodiment. As shown in Fig. 10, the solar cell module 1 according to the fourth embodiment includes, in addition to the solar cell module 1 according to the third embodiment, a film layer 101 between a deposition layer 102 and a printed layer 2, and an adhesive layer 103 between the printed layer 2 and the outermost film layer 101. The film layer 101 and the adhesive layer 103 may have the same configuration as the film layer 101 and the adhesive layer 103 in the first embodiment.

[0071] According to this configuration, the film layer 101 is interposed between the vapor deposition layer 102 and the printed layer 2. The printed layer 2 is protected by being sandwiched between the pair of film layers 101. In this case, compared to the structure in Fig. 11 described later, there is an advantage that the vapor deposition layer 102 is protected from the solvent contained in the ink when the printed layer 2 is formed.

[0072] [Fifth embodiment] In the following, a solar cell module 1 according to the fifth embodiment will be described with reference to Fig. 11. In the description of the fifth embodiment, descriptions that overlap with the first to fourth embodiments will be omitted, and only differences from the first to fourth embodiments will be described. In other words, to the extent technically possible, the descriptions of the first to fifth embodiments may be used as appropriate in the fifth embodiment.

[0073] Fig. 11 is a cross-sectional view that shows a schematic diagram of the solar cell module 1 according to the fifth embodiment. As shown in Fig. 11, the solar cell module 1 according to the fifth embodiment is different from the solar cell module 1 according to the fifth embodiment in that the lamination order of the deposition layer 102 and the film layer 101 is switched. As a result, the printing layer 2 and the deposition layer 102 are disposed adjacent to each other.

[0074] According to this configuration, the deposition layer 102 and the printing layer 2 are in contact with each other. The printing layer 2 and the deposition layer 102 are protected by being sandwiched between a pair of film layers 101. In this case, compared with the structure of Fig. 10 described above, there is an advantage that the deposition layer 102 and the printing layer 2 are protected from the solvent contained in the adhesive when the adhesive layer 103 is formed. [Explanation of symbols]

[0075] 1...solar cell module, 2, 2A, 2B, 2C...printed layer, 5...picture printed layer, 10...first color pattern layer, 11...first color dot, 12...binder for first color, 13...first color pigment chip, 14a, 14b...first interference pigment, 15a, 15b...first interference light, 20...second color pattern layer, 21...second color dot, 22...binder for second color, 23...second color pigment chip, 24...second interference pigment, 25...second interference light, 101...film layer, 102...vapor deposition layer, 104A...topcoat layer, 104B...glass layer.

Claims

1. A solar cell; a deposition layer disposed on the light-receiving surface side of the solar cell and formed by deposition of a metal.

2. The solar cell module according to claim 1 , further comprising a decorated printed layer disposed on an outer layer side of the vapor deposition layer with respect to the light receiving surface.

3. The printing layer is a first color pattern layer formed of a plurality of first color dots; a second color pattern layer provided on the first color pattern layer and configured by a plurality of second color dots; Each of the first color dots includes a first color binder and a plurality of first color pigment chips dispersed within the first color binder; Each of the plurality of second color dots includes a second color binder and a plurality of second color pigment chips dispersed within the second color binder; one of the plurality of first color pigment chips and the plurality of second color pigment chips is a first interference pigment of a plurality of colors that respectively generate first interference light different from each other; the other of the plurality of first color pigment chips and the plurality of second color pigment chips is a second interference pigment that generates a second interference light of a single color different from the mixed color represented by the plurality of first interference pigments; The solar cell module according to claim 2 , wherein the plurality of first interference lights and the second interference light are additively mixed.

4. The solar cell module according to claim 1 , further comprising a film layer as an outermost layer for the light receiving surface.

5. The solar cell module according to claim 1 , further comprising a top coat layer as an outermost layer on the light receiving surface.

6. The solar cell module according to claim 1 , further comprising a glass layer as an outermost layer for the light receiving surface.

7. The solar cell module according to claim 1 , wherein the deposition layer has a total light transmittance of 25% to 75%.

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