Deterioration-suppressing structure for solar power generation device

Abstract

To provide a deterioration-suppressing structure for a solar power generation device that can prevent the deterioration of a power generation unit due to the generated electricity not being consumed by reducing the amount of light that is irradiated on the power generation unit of the solar power generation device.SOLUTION: A deterioration suppressing structure 1 includes a solar power generation device 2 that generates power by irradiating a power generation unit 5 with light that has entered from a light receiving surface 4 and a light shielding member 3. The light shielding member 3 is attached to the solar power generation device 2 in a removable manner so as to cover the light-receiving surface 4 in a state in which it is in contact with the light receiving surface 4.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a deterioration suppression structure for a photovoltaic power generation device that generates power when light incident on a light receiving surface is irradiated onto a power generation section. [Background technology]

[0002] Conventionally, when storing or transporting a solar power generation device, the solar power generation device is packaged in a package for the main purpose of preventing damage to the solar power generation device, and this type of package is disclosed in Patent Document 1. The package in Patent Document 1 includes a housing member, a partition member, and a case cover member. The housing member includes a housing main body part having a box shape opening upward, and a first cushioning member provided on a 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 cushioning member provided on a partition plate part (upper surface part) of the partition main body part. The cover member has a box shape opening downward. When packaging a solar power generation device, the lower solar cell device is placed on the first cushioning member, the lower solar cell device is covered with the partitioning member, the upper solar cell device is placed on the second cushioning member, and the upper solar cell device is covered with the cover member, in that order. The lower and upper solar cell devices are both placed with their light-receiving surfaces facing upward. A space exists between the light-receiving surface of the lower solar power generation device and the partition member, and between the light-receiving surface of the upper solar power generation device and 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, as in Patent Document 1, when there is a space between the member covering the solar power generation device and the light receiving surface of the solar power generation device, the light passing through the space is irradiated onto the power generation unit of the solar power generation device, and the power generation unit may generate electricity. In this case, the generated electricity is not consumed, so that the power generation unit is loaded, and the performance of the solar power generation device may be deteriorated. In particular, when 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 deteriorated. In addition, when a monolithic structure in which multiple power generation units are connected in series is provided in a solar power generation device, when only some of the power generation units are irradiated with light, some of the power generation units may deteriorate, causing a sudden voltage drop in the entire monolithic structure.

[0005] The present invention has been made in consideration of the above-mentioned matters, and its object is to provide a deterioration suppression structure for a solar power generation device that can reduce the amount of light irradiated to the power generation unit of the solar power generation device, thereby suppressing deterioration of the power generation unit due to non-consumption of generated electricity. [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. A solar power generation device that generates electricity by irradiating a power generation unit with light incident on a light receiving surface, A deterioration suppression structure for a solar power generation device comprising: a light-shielding member that is removably attached to the solar power generation device so as to cover the light-receiving surface while being in contact with the light-receiving surface.

[0008] Item 2. The deterioration suppression structure for a solar power generation device according to item 1, wherein the light-shielding member and the light-receiving surface are bonded to each other via an adhesive with a strength of 25 N / 15 mm or less, so that the light-shielding member is removably attached to the solar power generation device.

[0009] Item 3. The deterioration suppression structure for a photovoltaic power generation device according to item 1, wherein the light blocking member is detachably attached to the photovoltaic power generation device by inserting the photovoltaic power generation device into a cavity in the light blocking member.

[0010] Item 4. A solar power generation device that generates electricity by irradiating a power generation unit with light incident on a light receiving surface, A deterioration suppression structure for a solar power generation device comprising: a light-shielding member arranged to cover at least the power generation section while being in contact with the light-receiving surface.

[0011] Item 5. The deterioration suppression structure for a solar power generation device according to item 4, wherein the light blocking member is attached to the solar power generation device by bonding the light blocking member and the light receiving surface via an adhesive with a strength of 25 N / 15 mm or less.

[0012] Item 6. The deterioration suppression structure for a photovoltaic power generation device according to any one of Items 1 to 5, wherein the power generation section contains an organic component. Effect of the Invention

[0013] According to the present invention, the amount of light irradiated onto the power generation unit of the solar power generation device can be reduced, thereby making it possible to suppress deterioration of the power generation unit due to non-consumption of generated electricity. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2A is a perspective view showing a deterioration suppression structure for a solar power generation device in accordance with a first embodiment, and FIG. 2B is a perspective view showing a state in which a light blocking member included in the deterioration suppression structure has been removed from the solar power generation device. [Diagram 2] 1A is a cross-sectional view of the deterioration suppression structure according to the first embodiment, 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. [Diagram 3] 1 is a cross-sectional view showing a state in which a plurality of deterioration suppression structures according to a first embodiment are stacked. [Figure 4]10A is a perspective view showing a deterioration suppression structure for a solar power generation device according to a second embodiment, and FIG. 10B is a perspective view showing a state in which a light blocking member included in the deterioration suppression structure has been removed from the solar power generation device. [Diagram 5] 11 is a cross-sectional view showing a state in which a plurality of degradation suppression structures according to a second embodiment are stacked. [Figure 6] 1A is an oblique view showing a deterioration suppression structure for a solar power generation device according to a modified example of the second embodiment, and FIG. 1B is an oblique view showing the state in which the light-shielding member provided in the deterioration suppression structure for the modified example has been removed from the solar power generation device. [Figure 7] 13 is a cross-sectional view showing a state in which a plurality of deterioration suppression structures according to a modified example of the second embodiment are stacked. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] First Embodiment A first embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 1(A) is a perspective view showing a deterioration suppression structure 1 for a solar power generation device 2 according to the first embodiment. Fig. 1(B) is a perspective view showing a state in which a light blocking member 3 provided in the deterioration suppression structure 1 is removed from the solar power generation device 2. Fig. 2(A) is a cross-sectional view of the deterioration suppression structure 1. 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 the power generation unit 5 is cut along line AA in Fig. 2(A).

[0016] The deterioration suppression structure 1 according to the first embodiment is applied to suppress deterioration of the power generation unit 5 of the solar power generation device 2 when the solar power generation device 2 is stored or transported, etc. The deterioration suppression structure 1 includes the solar power generation device 2 and a light-shielding member 3. The solar power generation device 2 generates power when light incident from a light-receiving surface 4 (FIGS. 1(B), 2(A)) is irradiated onto the power generation unit 5 (FIG. 2(A)). The light-shielding member 3 is removably attached to the solar power generation device 2 so as to cover the light-receiving surface 4 while being in contact with the light-receiving surface 4.

[0017] (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.

[0018] 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.

[0019] As shown in FIG. 2(A), the solar power generation device 2 includes a power generation section 5, a back sheet 6, a barrier sheet 7, a sealant 8, and a sealing edge material 9. The barrier sheet 7 constitutes the light receiving surface 4, and is disposed on the opposite side of the back sheet 6 in the thickness direction of the solar power generation device 2. The power generation section 5 is disposed between the back sheet 6 and the barrier sheet 7. The sealant 8 is filled in the space around the power generation section 5 between the barrier sheet 7 and the back sheet 6. The sealing edge material 9 seals the space between the outer periphery 14 of the back sheet 6 and the outer periphery 15 of the barrier sheet 7.

[0020] 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 modulus of the solar power generation device 2 are measured in accordance with JIS K 7171. In this manner, the solar power generation device 2 has flexibility, so that it can follow the shape of the installation surface 3, and is less likely to flap in the installed state due to wind or the like.

[0021] (Back seat 6) The back sheet 6 has a barrier property against water vapor and a protective property against external forces. The back sheet 6 may be light-transmitting, but is not necessarily required to be light-transmitting.

[0022] In this specification, the term "translucent" means that the transmittance of light is greater than 15% for the peak wavelength of light before incidence.

[0023] The back sheet 6 has flexibility. The modulus of longitudinal elasticity of the back sheet 6 is preferably 2400 MPa or more, more preferably 3000 MPa or more. The modulus of longitudinal elasticity of the back sheet 6 is preferably 4200 MPa or less, more preferably 3100 MPa or less. Examples of materials for the back sheet 6 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 6 that may be used include natural resins, rubber, metals, carbon, and pulp, in addition to synthetic resins.

[0024] The thickness of the back sheet 6 is preferably 50 μm or more, more preferably 100 μm or more, and is preferably 2000 μm or less, more preferably 1000 μm or less.

[0025] (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.

[0026] (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 7 toward the back sheet 6. That is, they are disposed so that the light-transmitting substrate 21 faces the barrier sheet 7, and the electrode 24 faces the back sheet 6.

[0027] (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 10% 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."

[0028] 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.

[0029] 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.

[0030] 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.

[0031] (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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] (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.

[0036] (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.

[0037] 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.

[0038] (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.

[0039] 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 13 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] (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.

[0046] 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.

[0047] 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.

[0048] (electrode 24) The electrode 24 is conductive 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 light-transmitting or may be made of a non-light-transmitting material. Examples of materials for the electrode 24 include platinum, gold, silver, copper, aluminum, rhodium, indium, titanium, nickel, tin, zinc, and alloys containing these metals.

[0049] (Barrier Sheet 7) The barrier sheet 7 has light-transmitting properties and constitutes the light-receiving surface 4 as described above. The barrier sheet 7 is preferably transparent. The barrier sheet 7 has a barrier property against water vapor and a protective property against external forces.

[0050] The barrier sheet 7 has flexibility. The material used for the barrier sheet 7 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 7 include a plastic film, a vinyl film, and the like.

[0051] The thickness of the barrier sheet 7 is preferably 50 μm or more, and more preferably 100 μm or more. The thickness of the barrier sheet 7 is preferably 2000 μm or less, and more preferably 1000 μm or less. When the thickness of the barrier sheet 7 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.

[0052] (Sealant 8) The sealant 8 prevents water from entering the power generation layer 23 from the periphery of the power generation layer 23. The sealant 8 has light-transmitting properties and is preferably transparent. The sealant 8 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 8, the exposed part may be covered with a sealing edge material 9 or the like.

[0053] Examples of materials for the sealant 8 include ethylene vinyl acetate (EVA), polyolefin, butyl rubber, silicone resin, polyvinyl butyral, acrylic resin, polyisobutylene resin, SBS resin, SIBS resin, and epoxy resin.

[0054] The transverse elastic modulus of the sealant 8 is preferably 0.01 MPa or more and 500 MPa or less, more preferably 0.05 MPa or more and 250 MPa or less, and further preferably 0.1 MPa or more and 100 MPa or less. In this way, the sealant 8 deforms in the planar direction in response to thermal expansion and contraction caused by the temperature difference between the back sheet 6 and the barrier sheet 7. This makes it possible to prevent the back sheet 6 and the barrier sheet 7 from peeling off from the sealant 8 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.

[0055] From another viewpoint, the viscosity of the sealant 8 can also be specified. The viscosity of the sealant 8 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.

[0056] In this case, examples of the material of the sealant 8 include polyolefin, butyl rubber, silicone resin, polyvinyl butyral, acrylic resin, polyisobutylene resin, etc. In this specification, the "viscosity" is a value measured at an environmental temperature of 23°C in accordance with the rotational viscometer method of JIS Z8803.

[0057] The back sheet 6 and the barrier sheet 7 are bonded via a sealant 8, 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.

[0058] From the viewpoint of enhancing the effect of preventing peeling, the thickness of the sealant 8 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 8 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 8 10 μm or more, it is possible to sufficiently ensure the escape of shear stress during thermal expansion and contraction. By making the thickness of the sealant 8 300 μm or less, it is possible to reduce the weight of the solar power generation device 2, thereby improving the workability and ease of installation.

[0059] (Sealing edge material 9) The sealing edge material 9 seals the gap between the outer peripheral edge 14 of the back sheet 6 and the outer peripheral edge 15 of the barrier sheet 7, with the power generation section 5 and the sealant 8 disposed between the back sheet 6 and the barrier sheet 7. As shown in FIG. 2(A), the sealing edge material 9 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 (upper surface in FIG. 2(A)) of the barrier sheet 7. The second adhesive portion 41 is adhered to the rear surface (lower surface in FIG. 2(A)) of the back sheet 6. The first adhesive portion 40, the sealing portion 42, and the second adhesive portion 41 are integrally formed.

[0060] The material of the sealing edge material 9 may be, for example, a tape material made of butyl rubber, silicone rubber, or the like.

[0061] In this embodiment, the sealing edge material 9 is not necessarily required. For example, instead of the sealing edge material 9, the edge of the barrier sheet 7 may be folded toward the back sheet 6 and the folded end may be joined to the back sheet 6. This makes the sealing edge material 9 unnecessary.

[0062] (Action of solar power generation device 2) In the above solar power generation device 2, when the power generation section 5 is irradiated with light incident from the light-receiving surface 4, 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).

[0063] 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. 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 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. 2(C)). The current is taken out via a power distribution line (not shown).

[0064] 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.

[0065] 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.

[0066] 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 electrode 24 of each power generation cell 20 on a common translucent base material 21, as shown in FIG. 2(C).

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] (Light blocking member 3) The light-shielding member 3 is a sheet material made of resin, fiber, or paper, and has light-shielding properties. Examples of the resin include soft resins such as PET, PE, EVOH, and EVA, and hard resins such as PP and PE. Examples of the fiber material include woven fabrics and nonwoven fabrics made of carbon fiber, glass fiber, or resin fiber. Examples of the paper material include cellulose, vegetable fiber, and synthetic resin fiber. The light-shielding member 3 preferably has a visible light or ultraviolet light transmittance of 15% or less, more preferably 10% or less, and even more preferably 5% or less. The transmittance may be appropriately selected depending on the material contained in the photovoltaic sheet. As to whether the transmittance value is to be a value for visible light or ultraviolet light, it is preferable to set the value for light that is likely to deteriorate the material. In addition, from the viewpoint of minimizing the incidence of light on the photovoltaic power generation device 2, it is preferable to set the color of the light-shielding member 3 to black. Note that the color of the light-shielding member 3 may be a glossy color. Even in this way, the incidence of light on the photovoltaic power generation device 2 can be minimized by reflection.

[0073] In this embodiment, since the solar power generation device 2 is formed into a substantially rectangular shape in a plan view, the light blocking member 3 is also formed into a substantially rectangular shape in a plan view, but the light blocking member 3 may be formed into any shape depending on the shape of the solar power generation device 2. For example, when the solar power generation device 2 is formed into a substantially circular shape, an elliptical shape, or a polygonal shape in a plan view, the light blocking member 3 may also be formed into a substantially circular shape, an elliptical shape, or a polygonal shape in a plan view.

[0074] An adhesive 50 is applied to one surface of the light-shielding member 3, and the light-shielding member 3 and the light-receiving surface 4 are bonded to each other via the adhesive 50 with a strength of 25 N / 15 mm or less. With a strength of this or less, the light-shielding member 3 can be peeled off manually at the installation site while maintaining the fixed state during transportation. In order to improve the ease of manual work, the strength may be more preferably 20 N / 15 mm or less, and even more preferably 15 N / 15 mm, to make the light-shielding member 3 easier to peel off. In order to maintain the fixed state during transportation, the strength may be 0 N / 15 mm or more, more preferably 0.01 N / 15 mm or more, and even more preferably 0.1 N / 15 mm. This adhesive strength is measured by a peel test in accordance with JIS Z 0237. By bonding the light-receiving surface 4 and the light-shielding member 3 via the adhesive 50, the light-shielding member 3 is removably attached to the solar power generation device 2 so as to cover the light-receiving surface 4 while in contact with the light-receiving surface 4.

[0075] In the present invention, the light-shielding member being in contact with the light-receiving surface 4 does not mean a geometrically strict contact state. A state in which there is a gap between the light-shielding member and the light-receiving surface 4 that corresponds to the thickness of the adhesive, or a state in which the light-shielding member is in contact with a portion of the light-receiving surface 4 but is not in contact with other areas of the light-receiving surface 4 due to bending of the light-shielding member, etc., are included in the light-shielding member being in contact with the light-receiving surface 4.

[0076] Furthermore, the above phrase "the shading member 3 is removably attached to the solar power generation device 2 so as to cover the light-receiving surface 4 while in contact with the light-receiving surface 4" includes the case where "the shading member 3 is removably attached to the solar power generation device 2 so as to cover the light-receiving surface 4 while in contact with the light-receiving surface 4 (i.e., the case where "attachment of the shading member 3 to the solar power generation device 2 and removal of the shading member 3 from the solar power generation device 2" can be repeated multiple times)" and the case where "after the shading member 3 has been once removed from the solar power generation device 2, the shading member 3 cannot be reattached to the solar power generation device 2 (i.e., the case where "attachment of the shading member 3 to the solar power generation device 2 and removal of the shading member 3 from the solar power generation device 2" is only possible once)".

[0077] When storing or transporting the photovoltaic power generation device 2, the light-shielding member 3 is adhered to the light-receiving surface 4 in a state 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). In this case, for example, as shown in FIG. 3, a plurality of photovoltaic power generation devices 2 having the light-shielding member 3 adhered to the light-receiving surface 4 are stacked (i.e., a plurality of deterioration suppression structures 1 are stacked). Alternatively, the photovoltaic power generation device 2 having the light-shielding member 3 adhered to the light-receiving surface 4 is rolled up (i.e., the deterioration suppression structure 1 is rolled up). When the photovoltaic power generation device 2 is installed at a power generation location, the light-shielding member 3 is peeled off from the photovoltaic power generation device 2, so that the current generated in the power generation unit 5 can be extracted via the power distribution line (i.e., the generated electricity can be consumed).

[0078] From the viewpoint of improving the fixation of the light-shielding member 3 to the solar power generation device 2, the light-shielding member 3 preferably has flexibility, and more preferably has flexibility equivalent to that of the solar power generation device 2. From the viewpoint of improving the ease of removing the light-shielding member 3 from the solar cell device, there may be a difference in flexibility between the light-shielding member 3 and the solar power generation device 2. Furthermore, when the deterioration prevention structure 1 is not rolled up during storage or transportation of the solar power generation device 2, it is preferable that the linear expansion coefficient of the light-shielding member 3 is equivalent to the linear expansion coefficient of the barrier sheet 7. When the deterioration prevention structure 1 is rolled up, it is preferable that the linear expansion coefficient of the light-shielding member 3 is smaller than the linear expansion coefficient of the barrier sheet 7.

[0079] (Action and effect) According to the deterioration suppression structure 1 of the present embodiment, the light-shielding member 3 is adhered to the light-receiving surface 4, so that the light-shielding member 3 covers the light-receiving surface 4 while in contact with the light-receiving surface 4, and therefore the amount of light irradiated to the power generation unit 5 can be reduced. This makes it possible to suppress deterioration of the power generation unit 5 due to non-consumption of generated electricity (for example, deterioration of the power generation unit 5 can be suppressed even when the power generation unit 5 contains an organic component or when multiple power generation units 5 are connected in series). This allows the solar power generation device 2 to be started while maintaining its quality.

[0080] Furthermore, according to the deterioration suppression structure 1 of the present embodiment, by bonding the light-shielding member 3 and the light-receiving surface 4 with the adhesive 50, it is possible to attach the light-shielding member 3 to the solar power generation device 2 without complicating the structure of the light-shielding member 3. This makes it possible to keep the manufacturing cost of the light-shielding member 3 low.

[0081] 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.

[0082] Fig. 4(A) is a perspective view showing a deterioration suppression structure 60 of a solar power generation device 2 according to a second embodiment. Fig. 4(B) is a perspective view showing a state in which a light blocking member 61 included in the deterioration suppression structure 60 is removed from the solar power generation device 2.

[0083] The deterioration suppression structure 60 according to the second embodiment includes a solar power generation device 2 and a light-shielding member 61. The light-shielding member 61 is box-shaped with a cavity 63 with an opening 62 at one end. The light-shielding member 61 is made of a material having light-shielding and fixed shape properties, and examples of the material of the light-shielding member 61 include resin and fiber. Examples of the resin include hard resins such as PP, PE, PC, and PET, and the resin used as the material of the light-shielding member 61 may be fiber-reinforced. Examples of the fiber include paper fiber, and cardboard containing cellulose fiber material or vegetable fiber material can be used to form the light-shielding member 61. The above materials may be used in combination.

[0084] In the deterioration suppression structure 60 according to the second embodiment, the solar power generation device 2 can be inserted into the cavity 63 of the light-shielding member 61 by moving the solar power generation device 2 in a direction parallel to the light-receiving surface 4, and this insertion causes the light-shielding member 61 to be removably attached to the solar power generation device 2 so as to cover the light-receiving surface 4 while being in contact with the light-receiving surface 4. In the illustrated example, the light-shielding member 61 is box-shaped with side walls 65 extending from each of the four sides forming the periphery of a rectangular bottom wall 64, so that the light-shielding member 61 has the above-mentioned cavity 63, but the shape of the light-shielding member 61 in the present invention is not limited to that of the illustrated example.

[0085] The above phrase "the shading member 61 is removably attached to the solar power generation device 2 so as to cover the light-receiving surface 4 while in contact with the light-receiving surface 4" includes the case where "the shading member 61 is removably attached to the solar power generation device 2 so as to cover the light-receiving surface 4 while in contact with the light-receiving surface 4 (i.e., the case where "attachment of the shading member 61 to the solar power generation device 2 and removal of the shading member 61 from the solar power generation device 2" can be repeated multiple times)" and the case where "after the shading member 61 has been once removed from the solar power generation device 2, the shading member 61 cannot be reattached to the solar power generation device 2 (i.e., the case where "attachment of the shading member 61 to the solar power generation device 2 and removal of the shading member 61 from the solar power generation device 2" is possible only once)".

[0086] When storing or transporting the solar power generation device 2, the solar power generation device 2 is inserted into the cavity 63 of the shading member 61 in a state in which 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). In this case, for example, as shown in FIG. 5, a plurality of shading members 61 with the solar power generation device 2 inserted into the cavity 63 are stacked (i.e., a plurality of deterioration suppression structures 60 are stacked). When installing the solar power generation device 2 at a power generation site, the solar power generation device 2 is removed from the cavity 63, and the current generated in the power generation unit 5 can be extracted via the power distribution line (i.e., the generated electricity can be consumed).

[0087] According to the above-described deterioration suppression structure 60, by inserting the photovoltaic power generation device 2 into the cavity 63, the light shielding member 61 covers the light receiving surface 4 while being in contact with the light receiving surface 4, so that it is possible to reduce the amount of light irradiated to the power generation unit 5 of the photovoltaic power generation device 2. Therefore, it is possible to suppress deterioration of the power generation unit 5 due to the lack of consumption of generated electricity.

[0088] The deterioration suppression structure according to the second embodiment can be modified as shown in FIG. 6. The deterioration suppression structure 70 shown in FIG. 6 includes a photovoltaic power generation device 2 and a light-shielding member 71. The light-shielding member 71 is bag-shaped with a cavity 74 with an opening 73 at one end. The light-shielding member 71 is composed of a pair of sheet materials 72, 72 having light-shielding properties and flexibility. Each of the sheet materials 72, 72 is rectangular. The sheet materials 72, 72 are overlapped and three sides of the sheet materials 72, 72 are joined together, so that the light-shielding member 71 has the cavity 74. The sheet materials 72, 72 are each formed of soft resin such as PET, EVOH, EVA, paper fiber such as cellulose fiber or vegetable fiber, nonwoven fabric such as chemical fiber, resin fiber, glass fiber, carbon fiber, or woven fabric. The sheet materials 72, 72 are joined by welding or by using an adhesive.

[0089] In the deterioration suppression structure 70, the photovoltaic power generation device 2 can be inserted into the cavity 74 of the light-shielding member 71 by moving the photovoltaic power generation device 2 in a direction parallel to the light-receiving surface 4, and the light-shielding member 71 is removably attached to the photovoltaic power generation device 2 so as to cover the light-receiving surface 4 while being in contact with the light-receiving surface 4. When the photovoltaic power generation device 2 is stored or transported, a plurality of light-shielding members 71 with the photovoltaic power generation device 2 inserted into the cavity 74 are stacked as shown in FIG. 7 in a situation where the generated electricity cannot be consumed (i.e., a plurality of deterioration suppression structures 70 are stacked). When the photovoltaic power generation device 2 is installed at a power generation location, the photovoltaic power generation device 2 is taken out of the cavity 74, and the light-shielding member 71 is removed from the photovoltaic power generation device 2, so that the generated electricity can be consumed. The deterioration suppression structure 70 described above also provides the same effect as the deterioration suppression structure 60 shown in FIGS. 4 and 5.

[0090] The above phrase "the shading member 71 is removably attached to the solar power generation device 2 so as to cover the light-receiving surface 4 while in contact with the light-receiving surface 4" includes the case where "the shading member 71 is removably attached to the solar power generation device 2 so as to cover the light-receiving surface 4 while in contact with the light-receiving surface 4 (i.e., the case where "attachment of the shading member 71 to the solar power generation device 2 and removal of the shading member 71 from the solar power generation device 2" can be repeated multiple times)" and the case where "after the shading member 71 has been once removed from the solar power generation device 2, the shading member 71 cannot be reattached to the solar power generation device 2 (i.e., the case where "attachment of the shading member 71 to the solar power generation device 2 and removal of the shading member 71 from the solar power generation device 2" is only possible once)".

[0091] In the deterioration suppression structures 60, 70, the transmittance of the light shielding members 61, 71 for visible light or ultraviolet light is preferably 15% or less, more preferably 10% or less, and even more preferably 5% or less. The transmittance may be appropriately selected depending on the material contained in the photovoltaic sheet. As to whether the transmittance is set to a value for visible light or ultraviolet light, it is preferable to set the transmittance to a value for light that easily deteriorates the material. From the viewpoint of minimizing the incidence of light on the photovoltaic power generation device 2, it is preferable to set the color of the light shielding members 61, 71 to black. The color of the light shielding members 61, 71 may be a glossy color. This also allows the incidence of light on the photovoltaic power generation device 2 to be minimized by reflection.

[0092] In the above, an example was shown in which the box-shaped light-shielding member 61 is made of a material having light-shielding properties and a fixed shape, but the light-shielding member 61 may be made of a material having light-shielding properties and flexibility. In this case, the light-shielding member 61 is made of soft resin such as PET, EVOH, EVA, paper fiber such as cellulose fiber, plant fiber, nonwoven fabric, woven fabric, etc. such as chemical fiber, resin fiber, glass fiber, carbon fiber, etc.

[0093] In the above, the sheet materials 72, 72 constituting the bag-shaped light-shielding member 71 are formed from a material having light-shielding properties and flexibility. However, the sheet materials 72, 72 constituting the light-shielding member 71 may be formed from a material having light-shielding properties and a fixed shape. In this case, resin or fiber can be used as the material of the sheet material 72. Examples of the resin include hard resins such as PP, PE, PC, and PET, and the resin used as the material of the light-shielding member 71 may be fiber-reinforced. Examples of the fiber include paper fiber, and cardboard containing cellulose fiber material or vegetable fiber material can be used to form the sheet material 72. The above materials may be used in combination.

[0094] In addition, when the light shielding members 61, 71 are made of a flexible material, it is preferable to make the cross section of the cavities 63, 74 slightly smaller than the cross section of the solar power generation device 2, and insert the solar power generation device 2 into the cavities 63, 74 while expanding the diameter of the cavities 63, 74. In this way, the light shielding members 61, 71 can be closely attached to the light receiving surface 4, so that the amount of light irradiated to the power generation unit 5 of the solar power generation device 2 can be further reduced. In particular, it is preferable that the adhesion between the light receiving surface 4 of the solar power generation device 2 and the light shielding members 61, 71 is high. In addition, the cross section of the cavities 63, 74 may be made slightly larger than the cross section of the solar power generation device 2, and the solar power generation device 2 may be inserted and then heated or air in the surplus space may be sucked in to bring the light receiving surface 4 of the solar power generation device 2 and the light shielding members 61, 71 into close contact with each other.

[0095] Furthermore, the shape of the light-shielding member according to the second embodiment is not limited to the shapes of the light-shielding members 61 and 71 shown in Figs. 4 to 7, and may be changed to various shapes that can cover the light-receiving surface 4 in a state of contact with the light-receiving surface 4 by fitting the photovoltaic power generation device 2 into the cavity. For example, the cavity of the light-shielding member according to the second embodiment may be one in which the photovoltaic power generation device 2 can be fitted by moving the photovoltaic power generation device 2 in a direction perpendicular to the light-receiving surface 4. Even in this case, by making the light-shielding member cover the light-receiving surface 4 in a state of contact with the light-receiving surface 4 through the above fitting, the amount of light irradiated to the power generation unit 5 can be reduced.

[0096] Furthermore, even when the sheet materials 72, 72 constituting the light-shielding member 71 are integrated, the joint strength of the joints of the sheet materials 72, 72 may be set relatively low compared to the strength of the base material of the sheet material 72 so that the sheet materials 72, 72 can be separated from the joints when the light-shielding member 71 is removed. In this way, the light-shielding member 71 can be easily removed, and the installation speed during installation can be improved. The above-mentioned "strength" may be elastic modulus, shear strength, peel strength, etc., and it is appropriately determined which of the elastic modulus, shear strength, and peel strength is to be adopted as the above-mentioned "strength" depending on the form of removal.

[0097] The deterioration suppression structure of the photovoltaic power generation device 2 of the present invention may be "a structure including a photovoltaic power generation device 2 that generates electricity by irradiating the power generation unit 5 with light incident from the light receiving surface 4, and a light shielding member arranged to cover at least the power generation unit 5 when in contact with the light receiving surface 4." The above "arrangement of the light shielding member to cover at least the power generation unit 5 when in contact with the light receiving surface 4" means that "when the light shielding member is in contact with the light receiving surface 4, the light shielding member faces at least the entire power generation unit 5 in the thickness direction of the photovoltaic power generation device 2." Even if the deterioration suppression structure of the present invention is as described above, the amount of light irradiated to the power generation unit 5 can be reduced by the light shielding member, so that deterioration of the power generation unit 5 due to the non-consumption of generated electricity can be suppressed. In the above case, for example, the light shielding member and the light receiving surface 4 are bonded to each other via an adhesive with a strength of 25 N / 15 mm or less, so that the light shielding member is attached to the photovoltaic power generation device 2. It should be noted that the present invention does not limit the method of attaching the above-mentioned shading member to the solar power generation device 2 to the above-mentioned method. For example, the above-mentioned shading member may be removably attached to the solar power generation device 2 by inserting the solar power generation device 2 into a cavity in the shading member. [Explanation of symbols]

[0098] 1,60,70 Deterioration suppression structure 2. Solar power generation equipment 3,61,71 Light blocking member 4 Photosensitive surface 5. Power Generation Division 64,73 aperture 65,74 hollow

Claims

1. a solar power generation device that generates power by irradiating a power generation section with light incident on a light receiving surface; A deterioration suppression structure for a solar power generation device comprising: a light-shielding member that is removably attached to the solar power generation device so as to cover at least the light-receiving surface when in contact with the light-receiving surface.

2. The deterioration suppression structure for a solar power generation device according to claim 1, wherein the light-shielding member and the light-receiving surface are bonded to each other via an adhesive with a strength of 25 N / 15 mm or less, so that the light-shielding member is removably attached to the solar power generation device.

3. The deterioration suppression structure for a photovoltaic power generation device according to claim 1 , wherein the light blocking member is detachably attached to the photovoltaic power generation device by inserting the photovoltaic power generation device into a cavity of the light blocking member.

4. a solar power generation device that generates power by irradiating a power generation section with light incident on a light receiving surface; A deterioration suppression structure for a solar power generation device comprising: a light-shielding member arranged to cover at least the power generation section while being in contact with the light-receiving surface.

5. The deterioration suppression structure for a solar power generation device according to claim 4, wherein the light-shielding member is attached to the solar power generation device by bonding the light-shielding member and the light-receiving surface together via an adhesive with a strength of 25 N / 15 mm or less.

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

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