Photovoltaic power generation device and installation structure for photovoltaic power generation device

Abstract

To provide a photovoltaic power generation device capable of improving a cut-off performance by making cracking hard to occur in a boundary part of a sheet between a front layer and a back layer.SOLUTION: A photovoltaic power generation device 2 comprises a front layer 5 constituting a front face 4, a back layer 7 constituting a rear face 6, and a power generation section 8 disposed between the front layer 5 and the back layer 7. The front layer 5 is configured by juxtaposing a plurality of barrier sheets 11, and the adjacent two barrier sheets 11 and 11 are joined along a barrier sheet boundary part 12 forming a boundary therebetween. The back layer 7 is configured by juxtaposing a plurality of back sheets 13, and the adjacent two back sheets 13 and 13 are joined along a back sheet boundary part 14 forming a boundary therebetween. The barrier sheet boundary part 12 and the back sheet boundary part 14 do not match in a planar view.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a solar power generation device and an installation structure for a solar power generation device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a solar power generation device has been used in which a power generation unit is disposed between a sheet constituting a front surface and a sheet constituting a back surface (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-67924 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for larger surface area solar power generation devices, and in order to meet this demand, for example, as shown in Figures 13 and 14, to form a layer 110 on the front surface of the solar power generation device 100, multiple sheets 111 are arranged side by side and the boundary portions 112 of two adjacent sheets 111, 111 are joined with an adhesive tape 113 (Figure 13(A)) or an adhesive 114 (Figure 14(A)), and to form a layer 120 on the back surface of the solar power generation device 100, multiple sheets 121 are arranged side by side and the boundary portions 122 of two adjacent sheets 121, 121 are joined with an adhesive tape 123 (Figure 13(A)) or an adhesive 124 (Figure 14(A)). 13 and 14, when a solar power generation device 100 is manufactured in which the boundary 112 and the boundary 122 coincide in a plan view (when the solar power generation device 100 is viewed in the thickness direction), the solar power generation device 100 is susceptible to cracking at the boundaries 112, 122 because the back layer 120 cannot prevent the front layer 110 from bending at the boundary 112, and the front layer 110 cannot prevent the back layer 120 from bending at the boundary 122. (FIGS. 13(B) and 14(B) show a state in which the boundaries 112, 122 are cracked.) When such cracks occur at the boundaries 112, 122, moisture may enter the inside of the solar power generation device 100 from the cracked boundaries 112, 122, causing deterioration of the power generation section 130.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a solar power generation device in which a front layer constituting the surface and a back layer constituting the back surface are composed of multiple sheets, each of which is formed by bonding two adjacent sheets, and in which cracks are less likely to occur at the boundary between the sheets in the front layer and the back layer, thereby improving water-stopping properties, and an installation structure for the solar power generation device. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention includes the subject matter described in the following paragraphs.

[0007] Item 1. The front layer that constitutes the surface, A back layer constituting the back surface; a power generation section disposed between the front layer and the back layer, the front layer is a layer in which a plurality of barrier sheets are arranged side by side, and two adjacent barrier sheets are joined along a barrier sheet boundary portion that defines a boundary between the barrier sheets; The back layer is formed by arranging a plurality of back sheets side by side, and two adjacent back sheets are joined along a back sheet boundary portion that forms a boundary between the back sheets, A solar power generation device in which any one of the barrier sheet boundary portions does not coincide with any of the back sheet boundary portions in a planar view, and any one of the back sheet boundary portions does not coincide with any of the barrier sheet boundary portions in a planar view.

[0008] Item 2. A photovoltaic power generating device according to item 1, in which any one of the barrier sheet boundary portions and any one of the back sheet boundary portions intersect at one point in a plan view.

[0009] Item 3. The solar power generation device according to item 2, wherein an angle at which any one of the barrier sheet boundary portions intersects with any one of the back sheet boundary portions in a plan view is 90°.

[0010] Item 4. The plurality of barrier sheets constituting the front layer and the plurality of back sheets constituting the back layer are all arranged side by side in a first direction perpendicular to the thickness direction of the solar power generation device, and each of the barrier sheet boundaries and each of the back sheet boundaries extend in a second direction perpendicular to the thickness direction and the first direction, 4. The photovoltaic power generating device according to any one of items 1 to 3, wherein each of the barrier sheet boundaries is misaligned in the first direction with respect to each of the back sheet boundaries.

[0011] Item 5. The two adjacent barrier sheets have their ends overlapped in the thickness direction of the solar power generation device, and the overlapped portion forms the barrier sheet boundary portion; The two adjacent back sheets have their ends overlapped in the thickness direction of the solar power generation device, and the overlapped portion forms the back sheet boundary portion, 5. The photovoltaic power generating device according to any one of items 1 to 4, wherein the width of the boundary portion of the barrier sheet and / or the width of the boundary portion of the back sheet is 10 mm or more.

[0012] Item 6. The two adjacent barrier sheets are butted together without any step in the thickness direction of the solar power generation device, and the butted parts form the barrier sheet boundary parts; 5. A solar power generation device according to any one of items 1 to 4, wherein the two adjacent back sheets are butted together without any step in the thickness direction of the solar power generation device, and the butted portions form the back sheet boundary portions.

[0013] Item 7. The solar power generation device according to any one of items 1 to 6. An installation surface on which the solar power generation device is installed, The installation surface is inclined with respect to the horizontal direction, The barrier sheet boundary portion extends in a direction in which the installation surface is inclined. Effect of the Invention

[0014] According to the present invention, cracks are less likely to occur at the boundary between the front layer and the back layer, so that the water-stopping properties of the photovoltaic power generation device can be improved. [Brief description of the drawings]

[0015] [Figure 1] 1A is a plan view showing an installation structure for a solar power generation device according to an embodiment of the present invention, FIG. 1B is a cross-sectional view showing the installation structure cut along line AA in FIG. 1A, and FIG. 1C is a cross-sectional view showing the installation structure cut along line BB in FIG. [Diagram 2]1A is a cross-sectional view showing a state where a part of a solar power generation device is cut along line CC in FIG. 1A. FIG. 1B is an enlarged view of part a in FIG. 1A. FIG. 1C is a cross-sectional view showing a state where a power generation unit is cut along line DD in FIG. 1A. [Diagram 3] 2A is a cross-sectional view of the vicinity of the boundary of the barrier sheet of the photovoltaic power generation device shown in Fig. 1. FIG. 2B is a cross-sectional view of the vicinity of the boundary of the barrier sheet of a modified example of the photovoltaic power generation device. [Figure 4] 2A is a cross-sectional view of the vicinity of the boundary portion of the backsheet of the solar power generation device shown in Fig. 1. FIG. 2B is a cross-sectional view of the vicinity of the boundary portion of the backsheet of a modified example of the solar power generation device. [Diagram 5] (A) is a plan view showing a modified example of the installation structure for a solar power generation device according to the present invention, (B) is a cross-sectional view showing the modified example of the installation structure cut along line EE in (A), and (C) is a cross-sectional view showing the modified example of the installation structure cut along line FF in (A). [Figure 6] (A) is a plan view showing a modified example of the installation structure for a solar power generation device according to the present invention, (B) is a cross-sectional view showing the modified example of the installation structure cut along line GG in (A), and (C) is a cross-sectional view showing the modified example of the installation structure cut along line HH in (A). [Figure 7] (A) is a plan view showing a modified installation structure for a solar power generation device according to the present invention. (B) is a cross-sectional view showing the modified installation structure cut along line II in (A). (C) is a cross-sectional view showing the modified installation structure cut along line JJ in (A). (D) is a cross-sectional view showing the modified installation structure cut along line KK in (A). [Figure 8] (A) is a plan view showing a modified example of the installation structure for a solar power generation device according to the present invention, (B) is a cross-sectional view showing the modified example of the installation structure cut along line LL in (A), and (C) is a cross-sectional view showing the modified example of the installation structure cut along line MM in (A). [Figure 9]9(A) is a cross-sectional view of the vicinity of the boundary of the barrier sheet of a modified example of the solar power generation device shown in Fig. 8. FIG. 9(B) is a cross-sectional view of the vicinity of the boundary of the barrier sheet of a modified example of the solar power generation device. [Figure 10] 9(A) is a cross-sectional view in the vicinity of the boundary portion of the backsheet of a modified example of the solar power generation device shown in Fig. 8. FIG. 9(B) is a cross-sectional view in the vicinity of the boundary portion of the backsheet of a modified example of the solar power generation device. [Figure 11] (A) is a plan view showing a modified example of the installation structure for a solar power generation device according to the present invention, (B) is a cross-sectional view showing the modified example of the installation structure cut along line NN in (A), and (C) is a cross-sectional view showing the modified example of the installation structure cut along line OO in (A). [Figure 12] (A) is a plan view showing a modified example of the installation structure for a solar power generation device according to the present invention, (B) is a cross-sectional view showing the modified example of the installation structure cut along line PP in (A), and (C) is a cross-sectional view showing the modified example of the installation structure cut along line QQ in (A). [Figure 13] 1A is a cross-sectional view showing a solar power generation device in which the boundary between the sheets in the front layer and the back layer coincide in plan view, and 1B is a cross-sectional view showing a state in which cracks have occurred at the boundary between the sheets in the front layer and the back layer in the solar power generation device shown in 1A. [Figure 14] 1A is a cross-sectional view showing a solar power generation device in which the boundary between the sheets in the front layer and the back layer coincide in plan view, and 1B is a cross-sectional view showing a state in which cracks have occurred at the boundary between the sheets in the front layer and the back layer in the solar power generation device shown in 1A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] First Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1(A) is a plan view showing an installation structure 1 for a solar power generation device 2 according to an embodiment of the present invention. Fig. 1(B) is a cross-sectional view showing a state in which the installation structure 1 is cut along line AA in Fig. 1(A). Fig. 1(C) is a cross-sectional view showing a state in which the installation structure 1 is cut along line BB in Fig. 1(A). Fig. 2(A) is a cross-sectional view showing a state in which a part of the solar power generation device 2 is cut along line CC in Fig. 1(A). Fig. 2(B) is an enlarged view of part a in Fig. 2(A). Fig. 2(C) is a cross-sectional view showing a state in which a power generation unit 8 is cut along line DD in Fig. 2(A).

[0017] An installation structure 1 according to an embodiment of the present invention includes a solar power generation device 2 and an installation surface 3 on which the solar power generation device 2 is to be installed.

[0018] (Installation surface 3) The installation surface 3 is formed by the surface of a building material. Examples of the building material include roofing materials, wall materials (metal siding materials, ceramic siding materials, sandwich panels, etc.), partitions, door materials, fence materials, floor materials, etc. Examples of the roofing material include roofing materials used for folded plate roofs, slate roofs, roof decks, tile roofing, standing flat roofing, etc. The roof may be vertically or horizontally shingled. Note that the present invention does not limit the member having the installation surface 3 to the above-mentioned building materials, and the installation surface 3 may be formed by the surface of a pavement forming a road, or may be the surface of a structure such as an automobile, train, or ship. In the illustrated example, the installation surface 3 is a flat surface, but may be a curved surface. The material of the member constituting the installation surface 3 is not particularly limited, and may be, for example, metal, resin, asphalt, or concrete.

[0019] (Solar power generation device 2) The solar power generation device 2 includes a front layer 5 constituting the front surface 4, a back layer 7 constituting the back surface 6, a power generation section 8 disposed between the front layer 5 and the back layer 7, a sealant 9 filled around the power generation section 8 between the front layer 5 and the back layer 7, and a sealing edge material 10 that seals the gap between the outer periphery of the front layer 5 and the outer periphery of the back layer 7. The solar power generation device 2 generates electricity in the power generation section 8 as light irradiated to the front surface 4 enters the power generation section 8.

[0020] The front layer 5 is made up of a plurality of barrier sheets 11 arranged side by side, and two adjacent barrier sheets 11, 11 are joined along a barrier sheet boundary portion 12 that forms the boundary between them. The back layer 7 is made up of a plurality of back sheets 13 arranged side by side, and two adjacent back sheets 13, 13 are joined along a back sheet boundary portion 14 that forms the boundary between them.

[0021] In this embodiment, an example is shown in which the front layer 5 is formed of two barrier sheets 11, 11 adjacent to each other in a first direction perpendicular to the thickness direction of the solar power generation device 2, and the back layer 7 is formed of two back sheets 13, 13 adjacent to each other in a second direction perpendicular to the thickness direction and the first direction, but the present invention does not limit the number of sheets 11, 13 constituting the layers 5, 7 to two. In addition, in this embodiment, a case is shown in which the first direction is the longitudinal direction of the solar power generation device 2 and the second direction is the width direction of the solar power generation device 2, but the first direction may be the width direction of the solar power generation device 2 and the second direction may be the longitudinal direction of the solar power generation device 2. Hereinafter, "two adjacent barrier sheets 11, 11" will be appropriately abbreviated as "barrier sheets 11, 11", and "two adjacent back sheets 13, 13" will be appropriately abbreviated as "back sheets 13, 13".

[0022] The solar power generation device 2 has a sheet shape. In this specification, "sheet shape" refers to a shape in which the thickness of the object is 10% or less of the maximum length between the outer edges in a planar view. For example, when the shape in a planar view is rectangular, "the maximum length between the outer edges in a planar view" refers to the length of the diagonal. Also, for example, when the shape in a planar view is circular, "the maximum length between the outer edges in a planar view" refers to the length of the diameter. In this specification, "sheet shape" also includes membrane, foil, film, and the like.

[0023] The solar power generation device 2 is formed in a generally rectangular shape when viewed from the front. However, the present invention does not particularly limit the shape of the solar power generation device 2, and the solar power generation device 2 may be, for example, generally circular, elliptical, or polygonal in plan view.

[0024] The solar power generation device 2 has flexibility (the property that an object can bend). In the present invention, the solar power generation device 2 has flexibility means that the solar power generation device 2 has a bending strength of 10 MPa or more, or that the solar power generation device 2 has a bending modulus of 100 MPa or more. The bending strength of the solar power generation device 2 is more preferably 20 MPa or more, more preferably 50 MPa or more. The bending strength of the solar power generation device 2 is preferably 200 MPa or less, more preferably 150 MPa or less, and more preferably 50 MPa or less. The bending modulus of the solar power generation device 2 is more preferably 500 MPa or more. The bending modulus of the solar power generation device 2 is preferably 10000 MPa or less, more preferably 5000 MPa or less. When the flexibility of the solar power generation device 2 is evaluated by the bending strength, the bending modulus does not have to be within the above range. When the flexibility of the solar power generation device 2 is evaluated by the bending modulus of elasticity, the bending strength does not have to be within the above range. The bending strength and bending elastic modulus of the solar power generation device 2 are measured in accordance with JIS K 7171.

[0025] (Back seat 13) The back sheet 13 has a barrier property against water vapor and a protective property against external forces. The back sheet 13 may be translucent, but is not necessarily required to be translucent. In this specification, "translucent" means that the transmittance of light is greater than 15% with respect to the peak wavelength of light before incidence. Examples of materials for the back sheet 13 include synthetic resins such as thermoplastic resins, thermosetting resins, general-purpose plastics, engineering plastics, vinyl resins (e.g., polyvinyl chloride), natural resins, rubber, metals, carbon, and pulp.

[0026] The modulus of longitudinal elasticity of the back sheet 13 is preferably 2400 MPa or more, more preferably 3000 MPa or more. The modulus of longitudinal elasticity of the back sheet 13 is preferably 4200 MPa or less, more preferably 3100 MPa or less. Examples of materials for the back sheet 13 include synthetic resins such as thermoplastic resins, thermosetting resins, general-purpose plastics, engineering plastics, and vinyl resins (e.g., polyvinyl chloride). Examples of materials for the back sheet 13 that may be used include natural resins, rubber, metals, carbon, and pulp, in addition to synthetic resins.

[0027] The thickness of the back sheet 13 is preferably 50 μm or more, and more preferably 100 μm or more, and is preferably 2000 μm or less, and more preferably 1000 μm or less.

[0028] (Power Generation Section 8) The power generation section 8 includes a power generation cell 20 (FIG. 2(A)), which is a photoelectric conversion element that utilizes the photovoltaic effect. In this embodiment, the power generation section 8 is configured as a photoelectric conversion unit in which a plurality of power generation cells 20 are arranged in the surface direction of the solar power generation device 2 (for example, in the longitudinal direction or width direction of the solar power generation device 2). Note that the power generation section 8 may be configured with a single power generation cell 20.

[0029] From the viewpoint of improving the waterproofing performance of the solar power generation device 2, it is preferable that the power generation section 8 does not overlap with the barrier sheet boundary section 12 and the back sheet boundary section 14 in a plan view, and the "distance L1 between the power generation section 8 and the barrier sheet boundary section 12 in a plan view (FIG. 1(A))" and the "distance L2 between the power generation section 8 and the back sheet boundary section 14 in a plan view (FIG. 1(B))" are preferably 10 mm or more, more preferably 15 mm or more, more preferably 20 mm or more, and more preferably 25 mm or more, respectively. Furthermore, from the viewpoint of improving the power generation performance of the solar power generation device 2, the above-mentioned distances L1 and L2 are preferably 200 mm or less, more preferably 150 mm or less, more preferably 100 mm or less, and more preferably 50 mm or less, respectively. In this application, "plan view" means "a view of the solar power generation device 2 in the thickness direction of the solar power generation device 2".

[0030] (Power generating cell 20) The power generating cell 20 includes a light-transmitting substrate 21, a light-transmitting conductive layer 22, a power generating layer 23, and an electrode 24. The light-transmitting substrate 21, the light-transmitting conductive layer 22, the power generating layer 23, and the electrode 24 are laminated in this order along a direction from the barrier sheet 11 toward the back sheet 13. In other words, they are disposed so that the light-transmitting substrate 21 faces the barrier sheet 11, and the electrode 24 faces the back sheet 13.

[0031] (Translucent base material 21) The light-transmitting substrate 21 supports the light-transmitting conductive layer 22, the power generation layer 23, and the electrode 24. The light-transmitting substrate 21 has light-transmitting properties. The light-transmitting properties of the light-transmitting substrate 21 may be such that the light transmittance is greater than 15% with respect to the peak wavelength of light before incidence, but is preferably 50% or more, and more preferably 80% or more. In this specification, a light transmittance of 80% or more with respect to the peak wavelength of light before incidence is defined as "transparent."

[0032] Examples of materials for the light-transmitting substrate 21 include inorganic materials, organic materials, and metal materials. Examples of inorganic materials include quartz glass and non-alkali glass. Examples of organic materials include plastics such as polyethylene terephthalate (PET), polyethylene naphthalene (PEN), polyethylene, polyimide, polyamide, polyamideimide, liquid crystal polymer, and cycloolefin polymer, as well as polymer films. Examples of metal materials include stainless steel, aluminum, titanium, and silicon.

[0033] There are no particular limitations on the thickness of the light-transmitting substrate 21 as long as it can support the light-transmitting conductive layer 22, the power generation layer 23, and the electrodes 24, and the thickness may be, for example, 10 μm or more and 300 μm or less.

[0034] The light-transmitting base material 21 is a base material that is required in the manufacturing process of the power generating cell 20, but is not necessarily a necessary component. The light-transmitting base material 21 may be used, for example, only during the manufacturing process of the solar power generation device 2, or may be removed after or during the manufacturing process. When removed, a base material that does not have light-transmitting properties may be used instead of the light-transmitting base material 21.

[0035] (Transparent conductive layer 22) The transparent conductive layer 22 is a layer having electrical conductivity and functions as a cathode. The transparent conductive layer 22 has light transmitting properties. The transparent conductive layer 22 is preferably transparent.

[0036] Examples of the transparent conductive layer 22 include transparent materials such as indium tin oxide (ITO), fluorine-doped tin oxide (FTO), NESA film, etc. The transparent conductive layer 22 is formed on the surface 4 of the transparent substrate by, for example, a sputtering method, an ion plating method, a plating method, a coating method, etc.

[0037] The light-transmitting conductive layer 22 may be configured to have light-transmitting properties by forming a light-transmitting pattern using an opaque material. Examples of the opaque material include platinum, gold, silver, copper, aluminum, rhodium, indium, titanium, nickel, tin, zinc, and alloys containing these. Examples of the light-transmitting pattern include a lattice shape, a line shape, a wavy line shape, a honeycomb shape, and a round hole shape.

[0038] The thickness of the transparent conductive layer 22 is preferably, for example, 30 nm or more and 300 nm or less. When the transparent conductive layer 22 is 30 nm or more and 300 nm or less, good conductivity can be obtained while maintaining high flexibility.

[0039] (Power Generation Layer 23) The power generation layer 23 is a layer that causes photoelectric conversion by irradiation with light, and generates electrons and holes from excitons generated by absorbing light. As shown in Fig. 2(B), the power generation layer 23 includes a hole transport layer 30, a photoelectric conversion layer 31, and an electron transport layer 32. The hole transport layer 30, the photoelectric conversion layer 31, and the electron transport layer 32 are laminated in this order along the direction from the translucent conductive layer 22 toward the electrode 24.

[0040] (Hole transport layer 30) The hole transport layer 30 extracts holes generated in the photoelectric conversion layer 31 to the light-transmitting conductive layer 22, and prevents electrons generated in the photoelectric conversion layer 31 from moving to the light-transmitting conductive layer 22. For example, a metal oxide can be used as the material of the hole transport layer 30. For example, titanium oxide, molybdenum oxide, vanadium oxide, zinc oxide, nickel oxide, lithium oxide, calcium oxide, cesium oxide, aluminum oxide, etc. may be used as the metal oxide. In addition, delafossite type compound semiconductor (CuGaO2), copper oxide, copper thiocyanate (CuSCN), vanadium pentoxide (VO5), graphene oxide, etc. may also be used. In addition, a p-type organic semiconductor or a p-type inorganic semiconductor may also be used as the material of the hole transport layer 30.

[0041] The thickness of the hole transport layer 30 is, for example, preferably 1 nm to 1000 nm, more preferably 10 nm to 500 nm, and even more preferably 10 nm to 50 nm. If the thickness of the hole transport layer 30 is 1 nm to 1000 nm, the transport of holes can be realized.

[0042] (Photoelectric conversion layer 31) The photoelectric conversion layer 31 (photoactive layer) is a layer that converts absorbed light into electricity. There are no particular limitations on the material of the photoelectric conversion layer 31 as long as it can convert absorbed light into electricity, and for example, amorphous silicon, perovskite, non-silicon-based materials (semiconductor material CIGS), etc. are used. The photoelectric conversion layer 31 may also have a tandem-type laminated structure that combines these materials. The photoelectric conversion layer 31 using a non-silicon-based material uses the semiconductor material CIGS containing copper (Cu), indium (In), gallium (Ga), and selenium (Se), which makes it easy to reduce the thickness of the photoelectric conversion layer.

[0043] In the following, as an example of a case where the power generating unit 8 contains an organic component, a case where a perovskite compound containing an organic component is contained in the photoelectric conversion layer 31 of the power generating unit 8 will be described. The photoelectric conversion layer 31 containing a perovskite compound has the advantage that the dependency of the power generation efficiency on the angle of incident light (hereinafter, sometimes referred to as the incidence angle dependency) is relatively low. As a result, in this embodiment, a higher power generation efficiency can be obtained.

[0044] The perovskite compound is a structure having a perovskite crystal structure or a crystal similar thereto. The perovskite crystal structure is represented by the composition formula ABX3. In this composition formula, for example, A represents an organic cation, B represents a metal cation, and X represents a halogen anion. However, the A site, B site, and X site are not limited to these.

[0045] The organic group of the organic cation constituting the A site is not particularly limited, and examples thereof include alkylammonium derivatives, formamidinium derivatives, etc. The organic cation constituting the A site may be of one type or of two or more types.

[0046] The metal of the metal cation constituting the B site is not particularly limited, and examples thereof include Cu, Ni, Mn, Fe, Co, Pd, Ge, Sn, Pb, Eu, etc. The metal cation constituting the B site may be one type or two or more types.

[0047] The halogen of the halogen anion constituting the X site is not particularly limited, and examples thereof include F, Cl, Br, and I. The halogen anion constituting the X site may be of one type or of two or more types.

[0048] The thickness of the photoelectric conversion layer 31 is, for example, preferably 1 nm or more and 1,000,000 nm or less, more preferably 100 nm or more and 50,000 nm or less, and further preferably 300 nm or more and 1,000 nm or less. When the thickness of the photoelectric conversion layer 31 is 1 nm or more and 1,000,000 nm or less, the photoelectric conversion efficiency is improved.

[0049] (Electron transport layer 32) The electron transport layer 32 extracts electrons generated in the photoelectric conversion layer 31 to the electrode 24, and prevents holes generated in the photoelectric conversion layer 31 from moving to the electrode 24. The electron transport layer 32 preferably contains, for example, either a halogen compound or a metal oxide.

[0050] Examples of halogen compounds include lithium halides (LiF, LiCl, LiBr, LiI) and sodium halides (NaF, NaCl, NaBr, NaI). Examples of elements constituting metal oxides include titanium, molybdenum, vanadium, zinc, nickel, lithium, potassium, cesium, aluminum, niobium, tin, and barium. In addition, an n-type organic semiconductor or an n-type inorganic semiconductor can also be used as the material of the electron transport layer 32.

[0051] The thickness of the electron transport layer 32 is, for example, preferably 1 nm or more and 1000 nm or less, more preferably 10 nm or more and 500 nm or less, and even more preferably 10 nm or more and 50 nm or less. If the thickness of the electron transport layer 32 is 1 nm or more and 1000 nm or less, electron transport can be realized.

[0052] (electrode 24) The electrode 24 has electrical conductivity and functions as an anode. The electrode 24 can extract electrons from the photoelectric conversion layer 31 in response to the photoelectric conversion caused by the photoelectric conversion layer 31. The electrode 24 may be formed of a light-transmitting material or a light-opaque material. However, if the electrode 24 is formed of a light-opaque material, the light blocking property of the solar power generation device can be further improved (i.e., the light from the opposite side of the surface 4 can be further prevented from entering the power generation unit 8). Examples of materials for the electrode 24 include platinum, gold, silver, copper, aluminum, rhodium, indium, titanium, nickel, tin, zinc, and alloys containing these metals.

[0053] (Barrier sheet 11) The barrier sheet 11 has light-transmitting properties and constitutes the front layer 5 as described above. The barrier sheet 11 is preferably transparent. The barrier sheet 11 has a barrier property against water vapor and a protective property against external forces.

[0054] The barrier sheet 11 is flexible. The material used for the barrier sheet 11 preferably has a modulus of longitudinal elasticity of 100 Pa or more and 10,000 MPa or less, more preferably 1,000 MPa or more and 5,000 MPa or less. Specific examples of the material for the barrier sheet 11 include a plastic film, a vinyl film, and the like.

[0055] The thickness of the barrier sheet 11 is preferably 50 μm or more, and more preferably 100 μm or more. The thickness of the barrier sheet 11 is preferably 2000 μm or less, and more preferably 1000 μm or less. When the thickness of the barrier sheet 11 is 50 μm or more and 2000 μm or less, the bending strength of the solar power generation device 2 can be easily set to 50 MPa or more and 150 MPa or less.

[0056] (Sealant 9) The sealant 9 prevents water from entering the power generation layer 23 from the periphery of the power generation layer 23. The sealant 9 has light-transmitting properties and is preferably transparent. The sealant 9 does not necessarily need to cover the entire power generation section 8. For example, when a part of the power generation section 8 is exposed from the sealant 9, the exposed part may be covered with a sealing edge material 10 or the like.

[0057] Examples of the material for the sealant 9 include ethylene vinyl acetate (EVA), polyolefin, butyl rubber, silicone resin, polyvinyl butyral, acrylic resin, polyisobutylene resin, SBS resin, SIBS resin, and epoxy resin.

[0058] The transverse elastic modulus of the sealant 9 is preferably 0.01 MPa or more, more preferably 0.05 MPa or more, and even more preferably 0.1 MPa or more, and is preferably 500 MPa or less, more preferably 250 MPa or less, and even more preferably 100 MPa or less. In this way, the sealant 9 deforms in the planar direction following thermal expansion and contraction caused by the temperature difference between the back sheet 13 and the barrier sheet 11. This makes it possible to prevent the back sheet 13 and the barrier sheet 11 from peeling off from the sealant 9 due to shear stress caused by thermal expansion and contraction. The "transverse elastic modulus" referred to in this application is, for example, a value calculated from the longitudinal elastic modulus and Poisson's ratio obtained by a tensile test method.

[0059] From another viewpoint, the sealant 9 can also be specified by its viscosity. The viscosity of the sealant 9 is preferably 11000 mPa·S or more, more preferably 26000 mPa·S or more, even more preferably 40000 mPa·S or more, and is preferably 700000 mPa·S or less, more preferably 450000 mPa·S or less, even more preferably 110000 mPa·S or less.

[0060] In this case, examples of the material of the sealant 9 include polyolefin, butyl rubber, silicone resin, polyvinyl butyral, acrylic resin, polyisobutylene resin, etc. The "viscosity" referred to in this specification is a value measured at an environmental temperature of 23°C in accordance with the rotational viscometer method of JIS Z8803.

[0061] The back sheet 13 and the barrier sheet 11 are bonded via the sealant 9, and the adhesive strength is preferably 0.1 N / 10 mm or more and 10 N / 10 mm or less in a peel test. In particular, when the solar power generation device 2 is installed in a bent state, the shear stress generated in the solar power generation device 2 becomes larger, so by adopting an adhesive strength in the above range in the peel test, peeling can be effectively suppressed for a long period of time. The peel test is performed in accordance with JIS Z 0237.

[0062] From the viewpoint of enhancing the effect of preventing peeling, the thickness of the sealant 9 is preferably 10 μm or more, more preferably 30 μm or more, and even more preferably 50 μm or more. On the other hand, the thickness of the sealant 9 is preferably 300 μm or less, more preferably 200 μm or less, and even more preferably 100 μm or less. By making the thickness of the sealant 9 10 μm or more, it is possible to sufficiently secure the escape allowance for the shear stress during thermal expansion and contraction. By making the thickness of the sealant 9 300 μm or less, it is possible to reduce the weight of the solar power generation device 2, thereby improving the workability and workability.

[0063] The solar power generation device 2 may not include the sealant 9. In this case, the solar power generation device 2 may have, for example, only the power generation unit 8 disposed between the front layer 5 and the back layer 7, and the front layer 5 and the back layer 7 each bonded to the power generation unit 8.

[0064] (Sealing edge material 10) As shown in Figures 1(B) and 1(C), the sealing edge material 10 has a structure in which a first adhesive portion 33 adhered to the "surface of the barrier sheet 11 constituting the front surface 4", a sealing portion 34 that seals between the barrier sheet 11 and the back sheet 13, and a second adhesive portion 35 adhered to the "surface of the back sheet 13 constituting the back surface 6" are sequentially connected.

[0065] Examples of the material for the sealing edge material 10 include tape materials made of butyl rubber, silicone rubber, and the like.

[0066] Also, the sealing edge material 10 is not necessarily required. For example, the edge of the front layer 5 may be folded toward the back layer 7, and the folded tip may be joined to the back layer 7. Alternatively, the edge of the back layer 7 may be folded toward the front layer 5, and the folded tip may be joined to the front layer 5. If this is done, the sealing edge material 10 will not be necessary.

[0067] (Action of solar power generation device 2) In the above solar power generation device 2, when light irradiated onto the surface 4 enters the power generation unit 8, the photoelectric conversion layer 31 of the power generation layer 23 absorbs the light and performs photoelectric conversion, generating electrons and holes in the photoelectric conversion layer 31. The electrons are extracted to the electrode 24 (anode) via the electron transport layer 32, and the holes are extracted to the translucent conductive layer 22 (cathode) via the hole transport layer 30, causing a current to flow from the translucent conductive layer 22 to the electrode 24 (i.e., power generation is performed).

[0068] Furthermore, by forming the back sheet 13, the electrode 24, and the electron transport layer 32 from a light-transmitting material, light from the back surface 6 (such as reflected light from the installation surface 3) can be incident on the power generation section 8 and absorbed by the photoelectric conversion layer 31, thereby further activating photoelectric conversion in the photoelectric conversion layer 31.

[0069] In the photoelectric conversion unit constituting the power generation section 8, an extension 24a is provided on the electrode 24 (anode) of each power generation cell 20 (FIG. 2(C)). The extension 24a of the electrode 24 extends toward the translucent conductive layer 22 (cathode). In two adjacent power generation cells 20, 20, the extension 24a of the electrode 24 of one cell 20 is joined to the translucent conductive layer 22 of the other cell 20. Due to this joining, while the solar power generation device 2 is irradiated with light, a current flows from the translucent conductive layer 22A at one end of the power generation section 8 (photoelectric conversion unit) to the electrode 24A at the other end of the power generation section 8 (the current flow is indicated by an arrow in FIG. 2(C)). The current is taken out via a power distribution line (not shown).

[0070] By configuring the power generation section 8 from the above-mentioned photoelectric conversion unit, even if a malfunction occurs in some of the power generation cells 20, the amount of electricity extracted from the power generation section 8 can be stabilized.

[0071] Instead of providing the extension 24a on the electrode 24 (anode) of each power generating cell 20, an extension extending toward the electrode 24 (anode) may be provided on the translucent conductive layer 22 (cathode) of each power generating cell 20. In this case, between two adjacent power generating cells 20, 20, the extension of the translucent conductive layer 22 of one cell 20 is joined to the electrode 24 of the other cell 20. In this manner, the same effect as above can be obtained.

[0072] Furthermore, when the power generation unit 8 is provided with a translucent base material 21, from the viewpoint of facilitating the manufacture of the power generation unit 8, it is preferable to support the translucent conductive layer 22, the power generation layer 23 and the electrodes 24 of each power generation cell 20 on a common translucent base material 21, as shown in FIG. 2(C).

[0073] Furthermore, when the power generating section 8 is configured by one power generating cell 20, the current flowing from the electrode 24 to the translucent conductive layer 22 is taken out via a power distribution line.

[0074] The solar power generation device 2 may include a plurality of power generation units 8. In this case, the plurality of power generation units 8 are arranged in the planar direction of the solar power generation device 2 and are electrically connected in series or in parallel.

[0075] When the power generation section 8 is composed of a photoelectric conversion unit, in order to connect a plurality of power generation sections 8 in series, the translucent conductive layer 22A at an end of one of the power generation sections 8 and the electrode 24A at an end of the other power generation section 8 are connected via a power distribution line in two adjacent power generation sections 8, 8. When connecting a plurality of power generation sections 8 in parallel, the translucent conductive layers 22A at the ends of two adjacent power generation sections 8, 10 and the electrodes 24A at the ends of the two adjacent power generation sections 8, 10 are connected via power distribution lines, respectively.

[0076] Furthermore, when the power generating unit 8 is composed of one power generating cell 20, in order to connect a plurality of power generating units 8 in series, the translucent conductive layer 22 of one of the power generating units 8 and the electrode 24 of the other power generating unit 8 are connected via a power distribution line in two adjacent power generating units 8,8. When connecting a plurality of power generating units 8 in parallel, the translucent conductive layers 22,22 of two adjacent power generating units 8,8 and the electrodes 24,24 of the two adjacent power generating units 8,8 are connected via power distribution lines, respectively.

[0077] In addition, whether the power generation section 8 is composed of the above-mentioned photoelectric conversion unit or one power generation cell 20, the distance between adjacent power generation sections 8, 8 may be more than 0 mm, and is preferably 2 mm or more, more preferably 5 mm or more, more preferably 10 mm or more, and even more preferably 15 mm or more. In addition, the distance between adjacent power generation sections 8, 8 is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 20 mm or less.

[0078] (Barrier sheet boundary 12 and back sheet boundary 14) 3(A) is a cross-sectional view of the solar power generation device 2 in the vicinity of a barrier sheet boundary portion 12. The ends 11a, 11a of two adjacent barrier sheets 11, 11 are overlapped in the thickness direction of the solar power generation device 2, and the overlapped portion of the barrier sheets 11, 11 forms a barrier sheet boundary portion 12. In the solar power generation device 2, an adhesive tape 40 extending along the barrier sheet boundary portion 12 is attached to the faces 11b, 11b of the barrier sheets 11, 11 that form the surface 4, thereby joining the two adjacent barrier sheets 11, 11. As the adhesive tape 40, for example, a tape made of butyl rubber, silicone rubber, or the like can be used.

[0079] As shown in FIG. 3B, in addition to attaching the adhesive tape 40 to the surfaces 11b, 11b of the barrier sheets 11, 11, the ends 11a, 11a of the barrier sheets 11, 11 may be adhered with an adhesive 41 or the ends 11a, 11a of the barrier sheets 11, 11 may be fused. In this way, the bonding of the barrier sheets 11, 11 can be made stronger. The barrier sheets 11, 11 may be bonded only by adhering the ends 11a, 11a of the barrier sheets 11, 11 with the adhesive 41 or only by fusing the ends 11a, 11a of the barrier sheets 11, 11. The adhesive 41 may be made of a resin composition containing at least one selected from the group consisting of vinyl acetate resin, ethylene vinyl acetate resin, epoxy resin, cyanoacrylate resin, acrylic resin, chloroprene rubber, styrene, butadiene rubber, polyurethane resin, silicone resin, and modified silicone resin. Methods for fusing include heating up to the melting temperature to fuse the sheets, fusing the sheets by the heat of friction between the sheets caused by vibration, and fusing the sheets by applying a solvent that dissolves the sheets to bring the adhesive surfaces to a molten state.

[0080] From the viewpoint of improving the waterproofing of the solar power generation device 2, the width H1 (FIG. 3) of the barrier sheet boundary portion 12 formed by overlapping the ends 11a, 11a of the barrier sheets 11, 11 is preferably 10 mm or more, more preferably 15 mm or more, more preferably 20 mm or more, more preferably 25 mm or more, and more preferably 30 mm or more.

[0081] 4(A) is a cross-sectional view of the solar power generation device 2 in the vicinity of the backsheet boundary portion 14. The ends 13a, 13a of two adjacent backsheets 13, 13 are overlapped in the thickness direction of the solar power generation device 2, and the overlapped portion of the backsheets 13, 13 forms the backsheet boundary portion 14. In the solar power generation device 2, an adhesive tape 42 extending along the backsheet boundary portion 14 is attached to the faces 13b, 13b of the backsheets 13, 13 forming the rear surface 6, thereby joining the two adjacent backsheets 13, 13. For example, a tape made of butyl rubber, silicone rubber, or the like can be used as the adhesive tape 42.

[0082] As shown in FIG. 4(B), in addition to attaching the adhesive tape 42 to the surfaces 13b, 13b of the backsheets 13, 13 as described above, the ends 13a, 13a of the backsheets 13, 13 may be bonded with an adhesive 43, or the ends 13a, 13a of the backsheets 13, 13 may be fused. In this way, the bonding of the backsheets 13, 13 can be made stronger. The backsheets 13, 13 may be bonded only by bonding the ends 13a, 13a of the backsheets 13, 13 with the adhesive 43, or by fusing the ends 13a, 13a of the backsheets 13, 13. The adhesive 43 may be made of, for example, the same material as the adhesive 41 (FIG. 3(B)).

[0083] From the viewpoint of improving the water-stopping property of the solar power generation device 2, the width H2 (FIG. 4) of the backsheet boundary portion 14 where the ends 13a, 13a of the backsheets 13, 13 overlap is preferably 10 mm or more, more preferably 15 mm or more, more preferably 20 mm or more, more preferably 25 mm or more, and more preferably 30 mm or more. From the viewpoint of increasing the power generation efficiency as much as possible, the width H2 of the backsheet boundary portion 14 is preferably 100 mm or less, more preferably 75 mm or less, and even more preferably 50 mm or less.

[0084] In this embodiment, as shown in Fig. 1(A), the barrier sheets 11, 11 are arranged in a first direction, and the barrier sheet boundary portion 12 extends in a second direction, and the back sheets 13, 13 are arranged in a second direction, and the back sheet boundary portion 14 extends in the first direction, so that the barrier sheet boundary portion 12 and the back sheet boundary portion 14 do not coincide in a plan view. This allows the back layer 7 to restrict the front layer 5 from bending at the barrier sheet boundary portion 12, and the front layer 5 to restrict the back layer 7 from bending at the back sheet boundary portion 14. Therefore, the solar power generation device 2 according to this embodiment is less likely to crack at the barrier sheet boundary portion 12 and the back sheet boundary portion 14. This makes it possible to suppress the intrusion of moisture into the solar power generation device 2 through the cracks, thereby improving the water stoppage property of the solar power generation device 2. In the present invention, "the barrier sheet boundary 12 and the back sheet boundary 14 coincide in a plan view" means "the entire length of the barrier sheet boundary 12 faces the back sheet boundary 14 in the thickness direction of the photovoltaic power generation device 2, or the entire length of the back sheet boundary 14 faces the barrier sheet boundary 12." In addition, "any one of the barrier sheet boundary parts does not coincide with any of the back sheet boundary parts in a plan view, and any one of the back sheet boundary parts does not coincide with any of the barrier sheet boundary parts in a plan view" as described in claim 1 of the present application also includes a case in which the photovoltaic power generation device 2 is provided with one barrier sheet boundary part 12 and one back sheet boundary part 14, and these boundaries 12, 14 do not coincide in a plan view, as in the example shown in Fig. 1.

[0085] Furthermore, according to this embodiment, the barrier sheet boundary portion 12 extends linearly in the second direction, and the back sheet boundary portion 14 extends linearly in the first direction, so that the number of intersections between the barrier sheet boundary portion 12 and the back sheet boundary portion 14 in a plan view is only one. Therefore, the back layer 7 strongly prevents the front layer 5 from bending at the barrier sheet boundary portion 12, and the front layer 5 strongly prevents the back layer 7 from bending at the back sheet boundary portion 14. Furthermore, according to this embodiment, the angle θ at which the barrier sheet boundary portion 12 and the back sheet boundary portion 14 intersect in a plan view is 90°, so that bending at the boundary portion 12 and the boundary portion 14 can be strongly prevented.

[0086] 5, the front layer 5 may be made up of three or more barrier sheets 11 arranged side by side in a first direction, with each barrier sheet boundary 12 extending in a second direction, and the back layer 7 may be made up of three or more back sheets 13 arranged side by side in the second direction, with each back sheet boundary 14 extending in the first direction, so that any one barrier sheet boundary 12 does not coincide with any of the back sheet boundaries 14 in a plan view, and any one back sheet boundary 14 does not coincide with any of the barrier sheet boundaries 12 in a plan view. In this way, the back layer 7 can prevent the front layer 5 from bending at each boundary 12, and the front layer 5 can prevent the back layer 7 from bending at each boundary 14, so that the solar power generation device 2 is less likely to crack at each of the boundaries 12, 14. 5(A), from the viewpoint of strongly restricting bending at each of the boundaries 12, 14, it is preferable that the number of intersections between any one barrier sheet boundary 12 and any one back sheet boundary 14 in plan view is only one, and that the angle θ at which any one barrier sheet boundary 12 and any one back sheet boundary 14 intersect in plan view is 90°. Note that the present invention does not require that the angle θ be 90°, and as long as the number of intersections between any one barrier sheet boundary 12 and any one back sheet boundary 14 in plan view is only one, the angle θ does not have to be 90°.

[0087] 6, a plurality of barrier sheets 11 constituting the front layer 5 and a plurality of back sheets 13 constituting the back layer 7 may be arranged in parallel in a first direction, with each barrier sheet boundary 12 and each back sheet boundary 14 extending in a second direction. In this case, by adjusting the number of barrier sheets 11 constituting the front layer 5, the number of back sheets 13 constituting the back layer 7, the width of each barrier sheet 11 in the first direction, and the width of each back sheet 13 in the first direction, each barrier sheet boundary 12 is shifted in position in the first direction with respect to each back sheet boundary 14. In this way, any one of the barrier sheet boundary portions 12 does not coincide with any of the back sheet boundary portions 14 in a planar view, and any one of the back sheet boundary portions 14 does not coincide with any of the barrier sheet boundary portions 12 in a planar view. Furthermore, the number of intersections between any one of the barrier sheet boundary portions 12 and any one of the back sheet boundary portions 14 in a planar view is zero. Therefore, the back layer 7 can strongly restrict the bending of the front layer 5 at the barrier sheet boundary portions 12, and the front layer 5 can strongly restrict the bending of the back layer 7 at the back sheet boundary portions 14. FIG. 6 shows an example in which the number (3) of barrier sheets 11 constituting the front layer 5 is made greater than the number (2) of back sheets 13 constituting the back layer 7, and the width of each barrier sheet 11 in the first direction is made smaller than the width of each back sheet 13 in the first direction, thereby displaced each barrier sheet boundary 12 in the first direction relative to each back sheet boundary 14. However, conversely to the above, the number of barrier sheets 11 constituting the front layer 5 may be made smaller than the number of back sheets 13 constituting the back layer 7, and the width of each barrier sheet 11 in the first direction may be made greater than the width of each back sheet 13 in the first direction, thereby displaced each barrier sheet boundary 12 in the first direction relative to each back sheet boundary 14.

[0088] 7, when the installation surface 3 is inclined relative to the horizontal direction, it is preferable to install the photovoltaic power generation device 2 on the installation surface 3 so that each barrier sheet boundary 12 extends in the direction in which the installation surface 3 is inclined. In this way, dirt near each barrier sheet boundary 12 can be washed away along the barrier sheet boundary 12, preventing dirt from accumulating due to steps at each barrier sheet boundary 12. This makes it possible to prevent a decrease in power generation efficiency caused by dirt on the surface 4.

[0089] From the viewpoint of preventing dirt from accumulating on the front surface 4 of the photovoltaic power generation device, two adjacent barrier sheets 11, 11 may be butted together without any step in the thickness direction of the photovoltaic power generation device 2, so that the butted portion forms a barrier sheet boundary portion 12, as shown in Fig. 8 and Fig. 9 (reference numerals 11c, 11c in Fig. 9 indicate the outer surfaces of the barrier sheets 11, 11 that are butted together). In this case, for example, as shown in Fig. 9(A), an adhesive tape 50 extending along the barrier sheet boundary portion 12 is attached to the faces 11b, 11b of the barrier sheets 11, 11 that form the front surface 4, thereby joining the two adjacent barrier sheets 11, 11. For example, the same material as the adhesive tape 40 (Fig. 3) can be used as the material of the adhesive tape 50.

[0090] As shown in Fig. 9(B), in addition to attaching the adhesive tape 40 to the faces 11b, 11b of the barrier sheets 11, 11, the outer surfaces 11c, 11c of the abutting barrier sheets 11, 11 may be bonded to each other with an adhesive 51, or the outer surfaces 11c, 11c of the abutting barrier sheets 11, 11 may be fused to each other. The barrier sheets 11, 11 may be joined only by bonding the outer surfaces 11c, 11c of the barrier sheets 11, 11 with the adhesive 51, or only by fusing the outer surfaces 11c, 11c of the barrier sheets 11, 11. The adhesive 51 may be made of, for example, the same material as the adhesive 41 (Fig. 3(B)).

[0091] From the viewpoint of minimizing the gap between the entire back surface 6 of the solar power generation device 2 and the installation surface 3, as shown in Figs. 8 and 10, two adjacent back sheets 13, 13 may be butted together without any step in the thickness direction of the solar power generation device 2, so that the butted portion forms the back sheet boundary portion 14 (reference numerals 13c, 13c shown in Fig. 10 indicate the outer surfaces of the back sheets 13, 13 to be butted). In this case, for example, as shown in Fig. 10(A), an adhesive tape 52 extending along the back sheet boundary portion 14 is attached to the surfaces 13b, 13b of the back sheets 13, 13 forming the back surface 6, thereby joining the two adjacent back sheets 13, 13. For example, the same material as the adhesive tape 40 (Fig. 3) can be used as the material of the adhesive tape 52.

[0092] As shown in Fig. 10(B), in addition to attaching the adhesive tape 52 to the surfaces 13b, 13b of the backsheets 13, 13, the outer surfaces 13c, 13c of the backsheets 13, 13 that are to be abutted may be bonded to each other with an adhesive 53, or the outer surfaces 13c, 13c of the backsheets 13, 13 that are to be abutted may be fused to each other. The backsheets 13, 13 may be joined only by bonding the outer surfaces 13c, 13c of the backsheets 13, 13 with the adhesive 53, or only by fusing the outer surfaces 13c, 13c of the backsheets 13, 13. The adhesive 53 may be made of, for example, the same material as the adhesive 41 (Fig. 3(B)).

[0093] Furthermore, as described above, when the barrier sheet boundary 12 is a portion where two adjacent barrier sheets 11, 11 are butted together, and the back sheet boundary 14 is a portion where two adjacent back sheets 13, 13 are butted together, from the viewpoint of stabilizing production of the solar power generation device 2, it is preferable that the shapes of the barrier sheet boundary 12 and the back sheet boundary 14 in plan view are linear as shown in Fig. 8. Furthermore, from the viewpoint of increasing the butted area and improving the bonding strength, it is preferable that the shapes of the barrier sheet boundary 12 and the back sheet boundary 14 in plan view are bent wavy as shown in Fig. 11, or curved wavy as shown in Fig. 12. [Explanation of symbols]

[0094] 1 Installation structure 2. Solar power generation equipment 3 Installation surface 4. Surface of the solar power generation device 5 Front layer 6 Back side of the solar power generation device 7 Back layer 8 Power Generation Division 11 Barrier Sheet 11a End of barrier sheet 12 Barrier sheet boundary 13 Back Seat 13a End of back sheet 14 Back sheet boundary H1 Barrier sheet boundary width H2 Backsheet border width

Claims

1. A front layer that constitutes the surface; A back layer constituting the back surface; a power generation section disposed between the front layer and the back layer, the front layer is a layer in which a plurality of barrier sheets are arranged side by side, and two adjacent barrier sheets are joined together along a barrier sheet boundary portion that defines a boundary between the barrier sheets; The back layer is formed by arranging a plurality of back sheets side by side, and two adjacent back sheets are joined along a back sheet boundary portion that forms a boundary between the back sheets, A solar power generation device in which any one of the barrier sheet boundary portions does not coincide with any of the back sheet boundary portions in a planar view, and any one of the back sheet boundary portions does not coincide with any of the barrier sheet boundary portions in a planar view.

2. The solar power generation device according to claim 1 , wherein any one of the barrier sheet boundary portions and any one of the back sheet boundary portions intersect at one point in a plan view.

3. The solar power generation device according to claim 2 , wherein an angle at which any one of the barrier sheet boundary portions intersects with any one of the back sheet boundary portions in a plan view is 90°.

4. the plurality of barrier sheets constituting the front layer and the plurality of back sheets constituting the back layer are all arranged side by side in a first direction perpendicular to a thickness direction of the solar power generation device, and each of the barrier sheet boundaries and each of the back sheet boundaries extend in a second direction perpendicular to the thickness direction and the first direction, The photovoltaic device of claim 1 , wherein each of the barrier-sheet boundaries is offset in the first direction relative to each of the back-sheet boundaries.

5. the ends of two adjacent barrier sheets are overlapped in a thickness direction of the solar power generation device, and the overlapped portion forms the barrier sheet boundary portion; The two adjacent back sheets have their ends overlapped in a thickness direction of the solar power generation device, and the overlapped portion forms the back sheet boundary portion, The photovoltaic power generation device according to claim 1 , wherein the width of the boundary portion of the barrier sheet and / or the width of the boundary portion of the back sheet is 10 mm or more.

6. two adjacent barrier sheets are butted together without any step in a thickness direction of the solar power generation device, and the butted portions form the barrier sheet boundary portions; The solar power generation device according to claim 1 , wherein the two adjacent back sheets are butted together without any step in the thickness direction of the solar power generation device, and the butted portion forms the back sheet boundary portion.

7. The solar power generation device according to any one of claims 1 to 6. An installation surface on which the solar power generation device is installed, The installation surface is inclined with respect to the horizontal direction, The barrier sheet boundary portion extends in a direction in which the installation surface is inclined.

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