Deterioration-suppressing structure for solar power generation device

Abstract

To provide a deterioration-suppressing structure for a solar power generation device capable of preventing the deterioration of a solar power generation unit due to the power generated not being consumed while reducing the number of parts by reducing the amount of light that enters a power generation unit without using any components other than the solar power generation device.SOLUTION: A deterioration suppression structure 1 includes a solar power generation device 2 that allows light to enter a power generation unit from a light-receiving surface 4 in order to generate power in the power generation unit. The solar power generation device 2 has light shielding properties that suppress the incidence of light from a surface 6 opposite the light receiving surface 4 into the power generation unit. It is rolled up so that the surface 6 opposite the light receiving surface 4 is on the outside.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a deterioration suppression structure for a solar power generation device in which the direction of light is adjusted so that light enters the power generation section from the light receiving surface side during use to cause the power generation section to generate power. [Background technology]

[0002] Conventionally, a photovoltaic power generation device has been used in which light is incident on a power generation unit from the light receiving surface side in order to generate power in the power generation unit. A package having a member for covering the light receiving surface is used mainly for the purpose of preventing damage to the light receiving surface when storing or transporting the photovoltaic power generation device. For example, the package in Patent Document 1 includes a housing member, a partition member, and a housing lid member. The housing member includes a housing main body part having a box shape opening upward, and a first buffer member provided on the bottom surface part of the housing main body part. The partition member includes a partition main body part having a box shape opening downward, and a second buffer member provided on a partition plate part (upper surface part) of the partition main body part. The lid member has a box shape opening downward. When packing the photovoltaic power generation devices, the following steps are sequentially performed: placing the lower solar cell device on the first cushioning member, covering the lower solar cell device with a partition member, placing the upper solar cell device on the second cushioning member, and covering the upper solar cell device with a lid member. The lower and upper solar cell devices are both placed with their light-receiving surfaces facing upward, with the light-receiving surface of the lower solar cell device covered by the partition member and the light-receiving surface of the upper solar cell device covered by the lid member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-41972 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when storing or transporting a solar power generation device, if light is incident on the power generation unit and the power generation unit generates electricity, the generated electricity is not consumed, which places a load on the power generation unit and may cause a decrease in the performance of the solar power generation device. In particular, if the power generation unit contains a large amount of organic components, such as a power generation unit containing a perovskite compound, the durability of the power generation unit is low, and the performance of the solar power generation device may be significantly decreased. In addition, if a monolithic structure in which multiple power generation units are connected in series is provided in a solar power generation device, if light is incident on only some of the power generation units, some of the power generation units may deteriorate, causing a sudden voltage drop in the entire monolithic structure.

[0005] Furthermore, if the light receiving surface is covered with a member other than the solar power generation device in order to prevent light from entering the power generation section, as in Patent Document 1, the number of parts will increase.

[0006] The present invention has been made in consideration of the above-mentioned matters, and its purpose is to provide a deterioration suppression structure for a solar power generation device that allows light to be incident on the power generation unit from the light-receiving surface side in order to generate electricity in the power generation unit, and that can reduce the amount of light incident on the power generation unit without using any components other than the solar power generation device, thereby suppressing deterioration of the power generation unit due to non-consumption of generated electricity while reducing the number of parts. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention includes the subject matter described in the following paragraphs.

[0008] Item 1. A deterioration suppression structure for a solar power generation device in which light is incident on a power generation unit from a light receiving surface side in order to generate power in the power generation unit, The solar power generation device has a light-blocking property that prevents light from the opposite side of the light-receiving surface from entering the power generation unit, and the deterioration suppression structure for the solar power generation device is wound into a roll so that the surface opposite the light-receiving surface is on the outside.

[0009] Item 2. A deterioration suppression structure for a solar power generation device in which light is incident on a power generation unit from a light receiving surface side in order to generate power in the power generation unit, the power generation unit has a light incident surface facing the light receiving surface in a thickness direction of the solar power generation device, and at least light irradiated to the light incident surface is incident on the power generation unit, The solar power generation device includes a non-translucent member having a light transmittance of less than 10% with respect to a peak wavelength of the light before it is incident, A deterioration suppression structure for a solar power generation device in which, when the solar power generation device is positioned so that at least a pair of opposing ends of the solar power generation device overlap, at least the light incident surface of the power generation section is covered by the opaque member.

[0010] Item 3. A deterioration suppression structure for a solar power generation device according to Item 1, in which a back sheet constituting the surface opposite the light receiving surface has opaqueness, so that the solar power generation device has a light blocking property that suppresses light from the opposite side of the light receiving surface from being incident on the power generation unit.

[0011] Item 4. The deterioration suppression structure for a photovoltaic power generation device according to item 1 or 3, wherein an opaque member covering an end face of the rolled-up photovoltaic power generation device is detachably attached to an end of the photovoltaic power generation device.

[0012] Item 5. The deterioration suppression structure for a photovoltaic power generation device according to any one of Items 1 to 4, wherein the power generation section contains an organic component.

[0013] Item 6. The deterioration suppression structure for a solar power generation device according to any one of Items 1 to 5, wherein the power generation section contains a perovskite compound. Effect of the Invention

[0014] According to the present invention, the amount of light incident on the power generation unit can be reduced without using any components other than the solar power generation device, so that deterioration of the power generation unit due to non-consumption of generated electricity can be suppressed while keeping the number of parts to a minimum. [Brief description of the drawings]

[0015] [Figure 1] 1 is a perspective view showing a deterioration suppression structure for a solar power generation device according to a first embodiment. FIG. [Diagram 2] FIG. 1 is a perspective view showing a solar power generation device. [Diagram 3] 1A is a cross-sectional view of a solar power generation device, FIG. 1B is an enlarged view of part a in FIG. 1A, and FIG. 1C is a cross-sectional view showing the power generation section cut along line AA in FIG. 1A. [Figure 4] FIG. 11 is a perspective view showing a deterioration suppression structure for a solar power generation device according to a second embodiment. [Diagram 5] 11 is a perspective view showing a state in which a light-opaque member included in a deterioration suppression structure according to a second embodiment has been removed from a solar power generation device. FIG. [Figure 6] 11 is a perspective view showing a deterioration suppression structure according to a second embodiment placed horizontally. FIG. [Figure 7] 11 is a perspective view showing a deterioration suppression structure according to a second embodiment in a vertically placed state. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] First Embodiment A first embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 1 is a perspective view showing a deterioration suppression structure 1 for a solar power generation device 2 according to a first embodiment. Fig. 2 is a perspective view showing the solar power generation device 2. Fig. 3(A) is a cross-sectional view of the solar power generation device 2. Fig. 3(B) is an enlarged view of part a in Fig. 3(A). Fig. 3(C) is a cross-sectional view showing the power generation unit 5 cut along line AA in Fig. 3(A).

[0017] The deterioration suppression structure 1 (FIG. 1) according to the first embodiment is applied to suppress deterioration of the power generation unit 5 (FIG. 3(A)) of the solar power generation device 2 during storage or transportation of the solar power generation device 2, etc. The solar power generation device 2 allows light to be incident on the power generation unit 5 from the light receiving surface 4 side (upper side in FIG. 3(A)) in order to generate power in the power generation unit 5. The solar power generation device 2 has a light blocking property that suppresses light from the opposite side of the light receiving surface 4 (lower side in FIG. 3(A)) from being incident on the power generation unit 5, and is flexible. In the deterioration suppression structure 1 (FIG. 1), the solar power generation device 2 is rolled up so that the surface 6 opposite the light receiving surface 4 faces outward (i.e., the light receiving surface 4 faces inward).

[0018] (Solar power generation device 2) The solar power generation device 2 is formed in 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.

[0019] The solar power generation device 2 is formed in a generally rectangular shape in a plan view. However, in the present invention, the shape of the solar power generation device 2 may be, for example, a generally circular shape in a plan view, an elliptical shape in a plan view, a polygonal shape in a plan view, or the like, and is not particularly limited.

[0020] As shown in Fig. 3(A), the solar power generation device 2 includes a power generation section 5, a back sheet 7, a barrier sheet 8, a sealant 9, and a sealing edge material 10. The barrier sheet 8 constitutes the light receiving surface 4, and is disposed on the opposite side of the back sheet 7 in the thickness direction of the solar power generation device 2 (corresponding to the vertical direction in Fig. 3(A)). The power generation section 5 is disposed between the back sheet 7 and the barrier sheet 8. The sealant 9 fills the space around the power generation section 5 between the barrier sheet 8 and the back sheet 7. The sealing edge material 10 seals the space between the outer periphery 14 of the back sheet 7 and the outer periphery 15 of the barrier sheet 8.

[0021] The solar power generation device 2 can have the above-mentioned light blocking property by having opaque back sheet 7. In the present invention, having opaque property means that the light transmittance is less than 10% with respect to the peak wavelength of light before incidence.

[0022] In the present invention, the solar power generation device 2 having 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 modulus of elasticity of the solar power generation device 2 are measured in accordance with JIS K 7171. In this way, the solar power generation device 2 has flexibility, so that it can follow the shape of the installation surface 3, and further, when installed, it is unlikely to flap about due to wind or the like.

[0023] (Back seat 7) In addition to the above-mentioned light-impermeability, the back sheet 7 also has flexibility, a barrier property against water vapor, and a protective property against external forces. Examples of materials for the back sheet 7 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.

[0024] The modulus of longitudinal elasticity of the back sheet 7 is preferably 2400 MPa or more, more preferably 3000 MPa or more, and is preferably 4200 MPa or less, more preferably 3100 MPa or less.

[0025] The thickness of the back sheet 7 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.

[0026] (Power Generation Section 5) The power generation section 5 includes a power generation cell 20, which is a photoelectric conversion element that utilizes the photovoltaic effect. In this embodiment, the power generation section 5 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 5 may be configured with a single power generation cell 20.

[0027] (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 8 toward the back sheet 7. That is, they are disposed so that the light-transmitting substrate 21 faces the barrier sheet 8, and the electrode 24 faces the back sheet 7.

[0028] (Translucent base material 21) The translucent base material 21 supports the translucent conductive layer 22, the power generation layer 23, and the electrode 24. The translucent base material 21 has translucency. The translucency of the translucent base material 21 may be such that the light transmittance is 10% or more with respect to the peak wavelength of the 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 the light before incidence is defined as "transparent."

[0029] 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.

[0030] 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.

[0031] 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.

[0032] (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.

[0033] 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 of the transparent substrate by, for example, a sputtering method, an ion plating method, a plating method, a coating method, etc.

[0034] 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.

[0035] The thickness of the transparent conductive layer 22 is preferably, for example, 30 nm or more and 300 nm or less. When the thickness of the transparent conductive layer 22 is 30 nm or more and 300 nm or less, good conductivity can be obtained while maintaining high flexibility.

[0036] (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. 3(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.

[0037] (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.

[0038] 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.

[0039] (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.

[0040] In the following, as an example of a case where the power generating unit 5 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 5 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] (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.

[0047] 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.

[0048] 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.

[0049] (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. If the electrode 24 is formed of a light-opaque material, the light blocking property of the solar power generation device 2 can be further improved (i.e., light from the side opposite to the light-receiving surface 4 can be further prevented from entering the power generation unit 5). Examples of materials for the electrode 24 include platinum, gold, silver, copper, aluminum, rhodium, indium, titanium, nickel, tin, zinc, and alloys containing these metals.

[0050] (Barrier Sheet 8) The barrier sheet 8 is translucent and constitutes the light receiving surface 4. The barrier sheet 8 is preferably transparent. The barrier sheet 8 has a barrier property against water vapor and a protective property against external forces.

[0051] The barrier sheet 8 is flexible. The material used for the barrier sheet 8 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 8 include a plastic film, a vinyl film, and the like.

[0052] The thickness of the barrier sheet 8 is preferably 50 μm or more, and more preferably 100 μm or more. The thickness of the barrier sheet 8 is preferably 2000 μm or less, and more preferably 1000 μm or less. When the thickness of the barrier sheet 8 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.

[0053] (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 5. For example, when a part of the power generation section 5 is exposed from the sealant 9, the exposed part may be covered with a sealing edge material 10 or the like.

[0054] 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.

[0055] The transverse elastic modulus of the sealant 9 is preferably 0.01 to 500 MPa, more preferably 0.05 to 250 MPa, and even more preferably 0.1 to 100 MPa. In this manner, the sealant 9 deforms in the planar direction in response to thermal expansion and contraction caused by the temperature difference between the back sheet 7 and the barrier sheet 8. This makes it possible to prevent the back sheet 7 and the barrier sheet 8 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 a value calculated from, for example, the longitudinal elastic modulus and the Poisson's ratio obtained by a tensile test method.

[0056] From another viewpoint, the viscosity of the sealant 9 can also be specified. The viscosity of the sealant 9 is preferably 11000 mPa·S or more and 700000 mPa·S or less, more preferably 26000 mPa·S or more and 450000 mPa·S or less, and even more preferably 40000 mPa·S or more and 110000 mPa·S or less.

[0057] 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.

[0058] The back sheet 7 and the barrier sheet 8 are bonded via a 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.

[0059] 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.

[0060] (Sealing edge material 10) The sealing edge material 10 seals the gap between the outer peripheral edge 14 of the back sheet 7 and the outer peripheral edge 15 of the barrier sheet 8, with the power generation section 5 and the sealant 9 disposed between the back sheet 7 and the barrier sheet 8. As shown in FIG. 3(A), the sealing edge material 10 includes a first adhesive portion 40, a second adhesive portion 41, and a sealing portion 42 connecting the first adhesive portion 40 and the second adhesive portion 41. The first adhesive portion 40 is adhered to the front surface of the barrier sheet 8 (the upper surface in FIG. 3(A)). The second adhesive portion 41 is adhered to the back surface of the back sheet 7 (the lower surface in FIG. 3(A)). The first adhesive portion 40, the sealing portion 42, and the second adhesive portion 41 are integrally formed.

[0061] Examples of the material for the sealing edge material 10 include tape materials made of butyl rubber, silicone rubber, and the like.

[0062] In this embodiment, the sealing edge material 10 is not necessarily required. For example, instead of the sealing edge material 10, the edge of the barrier sheet 8 may be folded toward the back sheet 7 and the folded tip may be joined to the back sheet 7. This makes the sealing edge material 10 unnecessary.

[0063] (Action of solar power generation device 2) According to the above-described solar power generation device 2, when light is incident on the power generation unit 5 from the light receiving surface 4 side (the upper side in FIG. 3(A)), the photoelectric conversion layer 31 of the power generation layer 23 absorbs the light and performs photoelectric conversion, thereby 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).

[0064] In the photoelectric conversion unit constituting the power generation section 5, an extension 24a is provided on the electrode 24 (anode) of each power generation cell 20 (FIG. 3(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 5 (photoelectric conversion unit) to the electrode 24A at the other end of the power generation section 5 (the current flow is indicated by an arrow in FIG. 3(C)). The current is taken out via a power distribution line (not shown).

[0065] By configuring the power generation section 5 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 5 can be stabilized.

[0066] 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 70 is joined to the electrode 24 of the other cell 70. In this manner, the same effect as above can be obtained.

[0067] Furthermore, when the power generation section 5 is provided with a translucent base material 21, from the viewpoint of facilitating the manufacture of the power generation section 5, 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. 3(C).

[0068] Furthermore, when the power generating section 5 is composed of 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.

[0069] The solar power generation device 2 may include a plurality of power generation units 5. In this case, the plurality of power generation units 5 are arranged in the planar direction of the solar power generation device 2 and are electrically connected in series or in parallel.

[0070] When the power generation sections 5 are composed of photoelectric conversion units, in order to connect a plurality of power generation sections 5 in series, the translucent conductive layer 22A at an end of one of the power generation sections 5 and the electrode 24A at an end of the other power generation section 5 are connected via a power distribution line in two adjacent power generation sections 5, 5. When connecting a plurality of power generation sections 5 in parallel, the translucent conductive layers 22A at the ends of two adjacent power generation sections 5, 5 and the electrodes 24A at the ends of the two adjacent power generation sections 5, 5 are connected via power distribution lines, respectively.

[0071] Furthermore, when the power generation unit 5 is composed of one power generation cell 20, in order to connect a plurality of power generation units 5 in series, the translucent conductive layer 22 of one of the power generation units 5 and the electrode 24 of the other power generation unit 5 are connected via a power distribution line in two adjacent power generation units 5, 5. When connecting a plurality of power generation units 5 in parallel, the translucent conductive layers 22, 22 of two adjacent power generation units 5, 5 and the electrodes 24, 24 of the two adjacent power generation units 5, 5 are connected via power distribution lines, respectively.

[0072] In addition, whether the power generation section 5 is composed of the above-mentioned photoelectric conversion unit or one power generation cell 20, the distance between adjacent power generation sections 5, 5 may be more than 0 mm, and is preferably 2 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 5, 5 is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 20 mm or less.

[0073] When storing or transporting the solar power generation device 2, in a situation where the current generated in the power generation unit 5 cannot be extracted via the power distribution line (i.e., the generated electricity cannot be consumed), the solar power generation device 2 is rolled up so that the surface 6 opposite the light-receiving surface 4 is on the outside (i.e., the light-receiving surface 4 is on the inside). When installing the solar power generation device 2 at a power generation location, the rolled solar power generation device 2 is unfolded and the orientation of the solar power generation device 2 is adjusted so that light is incident on the power generation unit 5 from the light-receiving surface 4 side (the upper side in FIG. 3(A)), and the current generated in the power generation unit 5 can be extracted via the power distribution line (the generated electricity can be consumed).

[0074] (Action and effect) According to the deterioration suppression structure 1 of this embodiment, the solar power generation device 2 has a light-shielding property that suppresses the light from the opposite side of the light receiving surface 4 (the lower side in FIG. 3(A)) from being incident on the power generation unit 5, and the solar power generation device 2 is rolled up so that the surface 6 opposite the light receiving surface 4 is on the outside, so that the amount of light incident on the power generation unit 5 can be reduced without using any member other than the solar power generation device 2. Therefore, it is possible to suppress the deterioration of the power generation unit 5 due to the non-consumption of generated electricity while reducing the number of parts (for example, even when the power generation unit 5 contains an organic component such as when the power generation unit 5 contains a perovskite compound, or when multiple power generation units 5 are connected in series, the deterioration of the power generation unit 5 can be suppressed). Therefore, the use of the solar power generation device 2 can be started while maintaining the quality of the solar power generation device 2.

[0075] Second Embodiment Next, a second embodiment of the present invention will be described. In the following description, differences from the first embodiment will be described, and the same reference numerals will be used to denote common points with the first embodiment, and description thereof will be omitted.

[0076] Fig. 4 is a perspective view showing a deterioration suppression structure 50 of a solar power generation device 2 according to the second embodiment. Fig. 5 is a perspective view showing a state in which opaque members 51, 51 included in the deterioration suppression structure 50 are removed from the solar power generation device 2.

[0077] The deterioration prevention structure 50 of the second embodiment comprises the solar power generation device 2 shown in the first embodiment and a pair of opaque members 51, 51 having opaque properties (as described above, having opaque properties means that the light transmittance is less than 10% with respect to the peak wavelength of the light before it is incident).

[0078] Each of the opaque members 51 includes an end wall 52 and an annular wall 53 extending from the end wall 52. Each of the opaque members 51 has a cavity 54 inside the annular wall 53, and the bottom of the cavity 54 is formed by the end wall 52. The inner diameter of the cavity 54 is, for example, 5 cm or more and 100 cm or less. This inner diameter may be determined in consideration of the flexibility of the photovoltaic power generation device 2. A smaller inner diameter can minimize the volume during transportation. A larger inner diameter can suppress the bending load generated when the photovoltaic power generation device 2 is held in a rolled state from being applied to the power generation unit 5 and wiring, thereby suppressing damage during transportation. From this perspective, the diameter of the outer periphery of the rolled photovoltaic power generation device 2 is preferably 3 cm or more, more preferably 5 cm or more, and even more preferably 7 cm or more, and is preferably 100 cm or less, more preferably 80 cm or less, and even more preferably 50 cm or less. By setting the diameter of the outer periphery of the rolled solar power generation device 2 within the above range, it is possible to both facilitate transportation of the solar power generation device 2 and prevent damage to the solar power generation device 2. In order to make the rolled solar power generation device 2 into a neat spiral shape, a core material extending from the center of the end wall 52 may be provided and the core material may be passed through the center of the roll of the solar power generation device 2. The cross-sectional shape of the core material may be cylindrical or polygonal, and the length of the core material may be approximately the same as the width of the solar power generation device 2.

[0079] In the deterioration prevention structure 50 of the second embodiment, the solar power generation device 2 is rolled up with the surface 6 opposite the light-receiving surface 4 facing outward, and one end of the solar power generation device 2 is inserted into the cavity 54 of one opaque member 51 and the other end of the solar power generation device 2 is inserted into the cavity 54 of the other opaque member 51, so that each of the opaque members 51, 51 is removably attached to the end of the solar power generation device 2 so as to cover the end face 55 of the solar power generation device 2.

[0080] In the illustrated example, the outline of the rolled solar power generation device 2 in a side view is substantially circular, so that the annular wall 53 is formed into a circular ring. However, the outline of the rolled solar power generation device 2 in a side view is not limited to the above-mentioned substantially circular shape, and may be formed into various shapes. The annular wall 53 may be formed into various ring shapes. For example, the annular wall 53 may be formed into an annular shape of an ellipse, a triangle, a square, a rectangle, or a polygon having 5 or more sides. The outline of the outer periphery of the annular wall 53 may be formed into a shape with corners (for example, a triangle, a square, a rectangle, or a polygon having 5 or more sides), while the outline of the inner periphery of the annular wall 53 may be formed into a shape without corners (for example, an ellipse or a circle). In this way, the outer periphery of the annular wall 53 has a cornered shape, so that the deterioration suppression structure 50 is less likely to roll, and the inner periphery of the annular wall 53 has a cornered shape, so that the end of the solar power generation device 2 inserted into the cavity 54 can be prevented from being damaged by contact with the annular wall 53. In the illustrated example, the end wall 52 has a circular plate shape, and the annular wall 53 extends from the outer periphery of the end wall 52, but the end wall 52 may have various shapes that form the bottom of the cavity 54. For example, the end wall 52 may have a plate shape that is square, rectangular, a polygon having five or more sides, or an ellipse. The outer periphery of the end wall 52 may protrude outside the annular wall 53.

[0081] Each of the opaque members 51 is made of resin, metal, paper, or cardboard. Examples of the resin include hard resins such as PC, PET, PE, PP, and ABS, and NBR, SBR, butyl rubber, and fluororubber. Examples of the material for the opaque member 51 include soft resins such as rubber and silicone rubber, and the opaque member 51 may be formed from a fiber-containing resin obtained by incorporating fibers into these resins. Examples of the metals include general-purpose metals such as cast iron and stainless steel. Examples of the material for the paper include cellulose fiber and vegetable fiber. When the opaque member 51 is formed from the resins or metals, the opaque member 51 can be used multiple times, so that the amount of the opaque member 51 that is discarded can be reduced. In addition, from the viewpoint of preventing light from passing through, the color of the opaque member 51 is preferably a color that easily absorbs ultraviolet rays, such as black, or a glossy color that reflects light.

[0082] Each opaque member 51 may be formed from a hard member having a tensile modulus of 100 MPa or more, more preferably 200 MPa or more, and even more preferably 300 MPa or more. By making the opaque member 51 have a certain degree of hardness, the contour shape of the roll can be regulated and maintained. The opaque member 51 may be formed from a soft member having a tensile modulus of less than 50 MPa, more preferably less than 25 MPa, and even more preferably less than 15 MPa. By making the opaque member 51 from a material that is soft and stretchable to a certain degree, the contour shape can be maintained by the restoring force of the soft member after rolling, and at the same time, the fixing force with the solar power generation device 2 can be increased, and further, the volume of the opaque member 51 after installation can be minimized, thereby reducing the amount of waste.

[0083] At least one of the end wall 52 and the annular wall 53 of each opaque member 51 may have a multi-layer structure in which a plurality of layers are laminated in the inward and outward direction. In the end wall 53, the inward and outward direction corresponds to the thickness direction of the end wall 53. In the annular wall 53, the inward and outward direction corresponds to the radial direction of the annular wall 53. In the case where the end wall 52 of each opaque member 51 has a multi-layer structure, it is preferable that the outer layer of the end wall 52 is harder. For example, the end wall 52 of each opaque member 51 has an inner layer that constitutes the bottom surface of the cavity 54 and an outer layer that is laminated on the outside of the inner layer and constitutes a part of the outer surface of the opaque member 51 (the end surface of the opaque member 51) (i.e., the end wall 52 of each opaque member 51 has a two-layer structure consisting of the inner layer and the outer layer). In this case, it is preferable that the outer layer of the end wall 52 is harder than the inner layer of the end wall 52. In addition, when the annular wall 53 of each opaque member 51 has a multi-layer structure, it is preferable that the outer layer of the annular wall 53 is harder. For example, the annular wall 53 of each opaque member 51 has an inner layer that forms the inner peripheral surface of the cavity 54, and an outer layer that is laminated on the outside of the inner layer and forms a part of the outer surface of the opaque member 51 (the outer peripheral surface of the opaque member 51) (i.e., the annular wall 53 of each opaque member 51 has a two-layer structure consisting of the inner layer and the outer layer). In this case, it is preferable that the outer layer of the annular wall 53 is harder than the inner layer of the annular wall 53.

[0084] When storing or transporting the photovoltaic power generation device 2, the photovoltaic power generation device 2 is rolled up, and then the opaque members 51, 51 are attached to the ends on one side and the other side of the photovoltaic power generation device 2, so that the end faces 55, 55 on one side and the other side of the photovoltaic power generation device 2 are covered with the opaque members 51, 51, and the deterioration suppression structure 50 is assembled. When the opaque member 51 is made of the above-mentioned hard member, the deterioration suppression structure 50 is arranged horizontally as shown in FIG. 6 or vertically as shown in FIG. 7. When the opaque member 51 is made of the above-mentioned soft member, the deterioration suppression structure 50 is arranged horizontally (FIG. 6). The above-mentioned horizontal arrangement is a method of arranging the deterioration suppression structure 50 so that the direction in which the opaque members 51, 51 face each other is the horizontal direction. The above-mentioned vertical arrangement is a method of arranging the deterioration suppression structure 50 so that the direction in which the opaque members 51, 51 face each other is the vertical direction. When the opaque members 51, 51 are made of a hard material, the deterioration control structure 50 can be stacked in multiple layers in either a horizontal or vertical position, improving loading efficiency. When the opaque members 51, 51 are made of a soft material, the weight of the deterioration control structure 50 is light, improving portability of the deterioration control structure 50.

[0085] When installing the solar power generation device 2 at a power generation site, each of the opaque members 51, 51 is removed from the end of the solar power generation device 2, and then the roll-shaped solar power generation device 2 is unfolded and the orientation of the solar power generation device 2 is adjusted so that light enters the power generation unit 5 from the light receiving surface 4 side (the upper side in Figure 3 (A)), and the current generated in the power generation unit 5 can be extracted via the distribution line (the generated electricity can be consumed).

[0086] According to the second embodiment described above, the solar power generation device 2 is wound into a roll as in the first embodiment, and in addition, the same effects as in the first embodiment can be obtained, and since the end faces 55, 55 on both sides of the solar power generation device 2 are covered with the opaque members 51, 51, it is possible to prevent light from entering through gaps in the rolls of the solar power generation device 2 on both sides of the solar power generation device 2. This makes it possible to further reduce the amount of light incident on the power generation unit 5 from the light-receiving surface 4 side, and therefore it is possible to further prevent deterioration of the power generation unit 5 (FIG. 3) due to non-consumption of generated electricity.

[0087] Note that only one end face 55 of the rolled solar power generation device 2 may be covered with the opaque member 51. In this case, if the solar power generation device 2 is placed on a support surface so that the other end face 55 of the solar power generation device 2 is in contact with the support surface, it is possible to prevent light from entering through gaps in the roll of the solar power generation device 2 on both sides of the solar power generation device 2, thereby obtaining the same effect as above.

[0088] Furthermore, the structure of the opaque member according to the second embodiment is not limited to the shape of the illustrated example. For example, the opaque member may be a sheet material that is adhered to the end of the solar power generation device 2 so as to cover the end surface 55 of the rolled solar power generation device 2. In this case, by appropriately selecting an adhesive for adhering the sheet material (opaque member) to the end of the solar power generation device 2, the sheet material (opaque member) can be detachably attached to the end of the solar power generation device 2.

[0089] In the above embodiment, the back sheet 7 has opacity, and thus the solar power generation device 2 has a light-shielding property that suppresses the incidence of light from the opposite side of the light-receiving surface 4 on the power generation unit 5. However, the back sheet 7 may have light-transmitting properties. In this case, the solar power generation device 2 has the light-shielding property by, for example, making the electrode 23 of the power generation unit 5 opaque, providing an opaque member between the back sheet 7 and the power generation unit 5, or providing an opaque member on the outside of the back sheet 7. Even in the above case, the solar power generation device 2 is rolled up so that the surface 6 opposite the light-receiving surface 4 faces outward, thereby suppressing the deterioration of the power generation unit 5 due to non-consumption of generated electricity while reducing the number of parts.

[0090] The deterioration suppression structure of the present invention may be described as "a deterioration suppression structure for a photovoltaic power generation device 2 that allows light to be incident on the power generation device 5 from the light receiving surface 4 side in order to generate power in the power generation device 5, the power generation device 5 having a light incident surface facing the light receiving surface 4 in the thickness direction of the photovoltaic power generation device 2, at least the light irradiated on the light incident surface is incident on the power generation device 5, the photovoltaic power generation device 2 is provided with an opaque member having a light transmittance of less than 10% of the peak wavelength of the light before incidence, and at least the light incident surface in the power generation device 5 is covered with the opaque member in a state in which the photovoltaic power generation device 2 is arranged so that at least a pair of ends of the opposing photovoltaic power generation devices 2 overlap." For example, when the shape of the photovoltaic power generation device 2 in a planar view is rectangular, the above-mentioned "pair of ends of the opposing photovoltaic power generation device 2" may be, for example, "a pair of ends of the photovoltaic power generation device 2 facing each other in the longitudinal direction of the photovoltaic power generation device 2" or "a pair of ends of the photovoltaic power generation device 2 facing each other in the width direction of the photovoltaic power generation device 2." For example, when the shape of the solar power generation device 2 in a plan view is a circle, the above-mentioned "a pair of opposing ends of the solar power generation device 2" is "a pair of ends of the solar power generation device 2 facing each other in the radial direction of the solar power generation device 2". For example, the "upper surface of the power generation unit 5 (upper surface of the translucent base material 21)" in the example of FIG. 3(A) corresponds to the above-mentioned "light incident surface of the power generation unit 5". Furthermore, the above-mentioned "at least the light incident surface of the power generation unit 5 is covered with the non-translucent member" means that "in a state in which the solar power generation device 2 is arranged so that at least the pair of ends of the opposing solar power generation devices 2 overlap, the non-translucent member faces at least the entire light incident surface of the power generation unit 5 in the thickness direction of the solar power generation device 2". Even if the deterioration suppression structure of the present invention is configured as described above, the amount of light incident on the power generation unit 5 can be reduced without using any member other than the solar power generation device 2. Therefore, it is possible to suppress deterioration of the power generation unit 5 due to non-consumption of generated electricity while reducing the number of parts. [Explanation of symbols]

[0091] 1,50 Deterioration suppression structure 2. Solar power generation equipment 4 Photosensitive surface 5. Power Generation Division 6 Opposite side of the light receiving surface 51 Opaque material 55 End face of solar power generation device

Claims

1. A deterioration suppression structure for a solar power generation device in which light is incident on a power generation unit from a light receiving surface side in order to generate power in the power generation unit, The solar power generation device has a light-blocking property that prevents light from the opposite side of the light-receiving surface from entering the power generation unit, and the deterioration suppression structure for the solar power generation device is wound into a roll so that the surface opposite the light-receiving surface is on the outside.

2. A deterioration suppression structure for a solar power generation device in which light is incident on a power generation unit from a light receiving surface side in order to generate power in the power generation unit, the power generating unit has a light incident surface facing the light receiving surface in a thickness direction of the solar power generating device, and at least light irradiated to the light incident surface is incident on the power generating unit, The solar power generation device includes a light-opaque member having a light transmittance of less than 10% with respect to a peak wavelength of light before incidence, A deterioration suppression structure for a solar power generation device in which at least the light incident surface of the power generation section is covered by the opaque member when the solar power generation device is positioned so that at least a pair of opposing ends of the solar power generation device overlap.

3. The deterioration suppression structure for a solar power generation device as described in claim 1, wherein the back sheet constituting the surface opposite the light receiving surface has opaqueness, so that the solar power generation device has a light blocking property that suppresses light from the opposite side of the light receiving surface from entering the power generation section.

4. The deterioration suppression structure for a photovoltaic power generation device according to claim 1 , wherein an opaque member covering an end face of the rolled-up photovoltaic power generation device is detachably attached to an end of the photovoltaic power generation device.

5. The deterioration suppression structure for a solar power generation device according to claim 1 , wherein the power generation section contains an organic component.

6. The deterioration suppression structure for a solar power generating device according to claim 1 , wherein the power generating section contains a perovskite compound.

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