WO2023181733A1 - Chaîne de cellules solaires de type à empilement, module de cellules solaires et procédé de fabrication de module de cellules solaires - Google Patents

Chaîne de cellules solaires de type à empilement, module de cellules solaires et procédé de fabrication de module de cellules solaires Download PDF

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WO2023181733A1
WO2023181733A1 PCT/JP2023/005545 JP2023005545W WO2023181733A1 WO 2023181733 A1 WO2023181733 A1 WO 2023181733A1 JP 2023005545 W JP2023005545 W JP 2023005545W WO 2023181733 A1 WO2023181733 A1 WO 2023181733A1
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solar cell
cell string
string
perovskite
crystalline silicon
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PCT/JP2023/005545
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English (en)
Japanese (ja)
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淳一 中村
広平 小島
徹 寺下
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株式会社カネカ
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
    • H10K30/40—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising a p-i-n structure, e.g. having a perovskite absorber between p-type and n-type charge transport layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K39/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic radiation-sensitive element covered by group H10K30/00
    • H10K39/10—Organic photovoltaic [PV] modules; Arrays of single organic PV cells
    • H10K39/15—Organic photovoltaic [PV] modules; Arrays of single organic PV cells comprising both organic PV cells and inorganic PV cells

Definitions

  • the present invention relates to a stacked solar cell string, a solar cell module, and a method for manufacturing a solar cell module.
  • a solar cell module in which a solar cell string including a plurality of solar cells is sealed with a protective member and a sealant such as glass or transparent resin.
  • solar cells crystalline silicon solar cells using a crystalline silicon substrate as a photoelectric conversion layer, and thin film solar cells using an inorganic thin film such as an amorphous silicon thin film as a photoelectric conversion layer are known.
  • a perovskite thin film solar cell is known that uses a perovskite thin film, which is an organic thin film (specifically, an organic/inorganic hybrid thin film), as a photoelectric conversion layer.
  • multi-junction (tandem) type solar cell modules have become known, in which photoelectric conversion layers with different band gaps are stacked, with the aim of effectively utilizing light in a wide wavelength range to increase the conversion efficiency of solar cells. .
  • Patent Document 1 discloses a multijunction solar cell in which two photoelectric conversion sections including different photoelectric conversion layers are stacked in a single solar cell.
  • this solar cell for example, a bottom cell including a crystalline silicon substrate as a photoelectric conversion layer and a top cell including a perovskite thin film as a photoelectric conversion layer are stacked in a single solar cell.
  • Patent Document 2 discloses a multijunction solar cell module in which two types of solar cells each containing different photoelectric conversion layers are stacked.
  • This solar cell module includes, for example, a crystalline silicon solar cell string composed of a bottom cell containing a crystalline silicon substrate as a photoelectric conversion layer, and a perovskite solar cell string composed of a top cell containing a perovskite thin film as a photoelectric conversion layer. are stacked as two types of solar cell strings.
  • Patent Document 2 in a multijunction solar cell module in which two types of solar cell strings each comprising two types of solar cells each having a different photoelectric conversion layer are stacked, for example, a film-like perovskite is used. Although it is conceivable to attach a crystalline silicon solar cell string to a crystalline silicon solar cell string, it is difficult to do so without creating gaps (for example, air bubbles). When a gap occurs, optical loss occurs.
  • An object of the present invention is to provide a stacked solar cell string, a solar cell module, and a method for manufacturing a solar cell module that reduces the gap between two types of solar cell strings each composed of two types of solar cells. do.
  • a stacked solar cell string comprises: a crystalline silicon solar cell string including a plurality of crystalline silicon solar cells; a perovskite solar cell string including a plurality of perovskite solar cells; A string sealing material is provided between the cell string and the perovskite solar cell string, and seals between the crystalline silicon solar cell string and the perovskite solar cell string.
  • the perovskite solar cell string is stacked on the light-receiving side of the crystalline silicon solar cell string via the string sealant.
  • the solar cell module according to the present invention includes the plurality of stacked solar cell strings described above, a light receiving side protection member that protects the light receiving side of the plurality of stacked solar cell strings, and the back side of the plurality of stacked solar cell strings. a backside protection member that protects the plurality of stacked solar cell strings, and a backside protection member that protects the plurality of and a module sealing material for sealing the stacked solar cell strings.
  • a method for manufacturing a solar cell module according to the present invention is a method for manufacturing the above-mentioned solar cell module, in which a crystalline silicon solar cell string and a perovskite solar cell string are stacked via a string encapsulant.
  • the method includes a laminating step of laminating a side protection member and a back side protection member with a module sealing material interposed therebetween, and heating and crosslinking the module sealing material to produce a solar cell module.
  • FIG. 1 is a schematic cross-sectional view of a solar cell module according to the present embodiment.
  • FIG. 2 is a schematic plan view showing the crystalline silicon solar cell string of the stacked solar cell string in the solar cell module shown in FIG. 1 from the light-receiving surface side.
  • FIG. 2 is a schematic plan view showing the perovskite solar cell string of the stacked solar cell string in the solar cell module shown in FIG. 1 from the light-receiving surface side.
  • FIG. 2 is a schematic exploded view showing a stacked solar cell string in the solar cell module shown in FIG. 1, which is a stacked solar cell string according to the present embodiment.
  • 5 is a schematic cross-sectional view of a perovskite solar cell of the perovskite solar cell string in the stacked solar cell string shown in FIG. 4.
  • FIG. 4 is a schematic cross-sectional view of a perovskite solar cell of the perovskite solar cell string in the stacked solar cell string shown in FIG.
  • FIG. 1 is a schematic cross-sectional view of a solar cell module according to this embodiment.
  • a solar cell module 100 shown in FIG. 1 is a multijunction type (tandem type) solar cell module including a plurality of stacked solar cell strings 1.
  • the stacked solar cell string 1 is a multi-junction structure including a crystalline silicon solar cell string 110 and a perovskite solar cell string 120 stacked on the light receiving side of the crystalline silicon solar cell string 110 with a string encapsulant 130 interposed therebetween. This is a tandem type solar cell string.
  • FIG. 2 is a schematic plan view showing the crystalline silicon solar cell string 110 of the stacked solar cell string 1 in the solar cell module 100 shown in FIG. 1 from the light-receiving surface side
  • FIG. FIG. 2 is a schematic plan view showing a perovskite solar cell string 120 of the stacked solar cell string 1 in the solar cell module 100 from the light-receiving surface side.
  • the position of the wiring member is not limited to the light receiving side, but also includes the case where it is on the back side.
  • Crystalline silicon solar cell string 110 includes a plurality of crystalline silicon solar cells 10
  • perovskite solar cell string 120 includes a plurality of perovskite solar cells 20 . Details of the stacked solar cell string 1 will be described later.
  • the stacked solar cell string 1 is sandwiched between a light-receiving side protection member 3 and a back side protection member 4.
  • a liquid or solid encapsulant 5 (hereinafter also referred to as module encapsulant) is filled between the light-receiving side protection member 3 and the back side protection member 4.
  • Battery string 1 is sealed.
  • the sealing material 5 seals and protects the stacked solar cell string 1, and is used between the light receiving side surface of the stacked solar cell string 1 and the light receiving side protection member 3, and between the stacked solar cell string 1 and the light receiving side protection member 3. 1 and the back side protection member 4 .
  • the shape of the sealing material 5 is not particularly limited, and examples thereof include a sheet shape. This is because if it is in the form of a sheet, it is easy to coat the front and back surfaces of the planar stacked solar cell string 1.
  • the material of the sealing material 5 is not particularly limited, but preferably has the property of transmitting light (translucency). Moreover, the material of the sealing material 5 has an adhesive property that allows the stacked solar cell string 1 and the light-receiving side protection member 3 to be bonded together, and an adhesive property that allows the stacked solar cell string 1 and the back side protection member 4 to be bonded together. Then it is preferable.
  • Examples of such materials include ethylene/vinyl acetate copolymer (EVA), ethylene/ ⁇ -olefin copolymer, ethylene/vinyl acetate/trialyl isocyanurate (EVAT), polyvinyl butyrate (PVB), and acrylic. Transparent resins such as resins, urethane resins, and silicone resins may be used.
  • the sealing material (module sealing material) 5 may contain a crosslinking agent.
  • the crosslinking agent include organic peroxides. More specifically, examples of the crosslinking agent include tert-butyl peroxyisopropyl carbonate, tert-butyl peroxy acetate, tert-butyl peroxy benzoate, dicumyl peroxide, 2,5-dimethyl-2,5- Bis(tert-butylperoxy)hexane, di-tert-butylperoxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane-3,1,1-bis(tert-butylperoxy) )-3,3,5-trimethylcyclohexane, 1,1-bis(tert-butylperoxy)cyclohexane, methyl ethyl ketone peroxide, 2,5-dimethylhexyl-2,5-bisperoxybenzoate, tert-butyl
  • the light-receiving side protection member 3 covers the surface (light-receiving surface) of the stacked solar cell string 1 via the sealant 5 to protect the stacked solar cell string 1.
  • the shape of the light-receiving side protection member 3 is not particularly limited, a plate-like or sheet-like shape is preferable since it indirectly covers the planar light-receiving surface.
  • the material for the light-receiving side protection member 3 is not particularly limited, but like the sealing material 5, it is preferably a material that is transparent but resistant to ultraviolet light, such as glass or Examples include transparent resins such as acrylic resins and polycarbonate resins. Further, the surface of the light-receiving side protection member 3 may be processed into an uneven shape, or may be coated with an antireflection coating layer. This is because the light-receiving side protection member 3 makes it difficult to reflect the received light and guides more light to the stacked solar cell string 1. Moreover, when the material of the light-receiving side protection member 3 is resin, a barrier film that prevents the passage of water vapor may be provided on the back or front surface of the light-receiving side protection member 3.
  • the crystalline silicon-based solar cell string 110 and the perovskite-based solar cell string 120 that is, the crystalline silicon-based solar cell 10 and the perovskite-based solar cell 20
  • the perovskite-based solar cell string 120 that is, the perovskite-based solar cell 20 can be protected from water vapor.
  • the back side protection member 4 covers the back side of the stacked solar cell string 1 via the sealant 5 to protect the stacked solar cell string 1.
  • the shape of the backside protection member 4 is not particularly limited, but like the light-receiving side protection member 3, a plate-like or sheet-like shape is preferable since it indirectly covers the planar backside.
  • the material for the backside protection member 4 is not particularly limited, but a material that prevents water from entering (high water-shielding property) is preferable.
  • a resin film such as polyethylene terephthalate (PET), polyethylene (PE), olefin resin, fluorine-containing resin, or silicone-containing resin, or a plate-shaped resin member having translucency such as glass, polycarbonate, or acrylic; Examples include laminates with metal foils such as aluminum foils.
  • a barrier film may be provided on the front or back side of the backside protection member 4 to prevent passage of water vapor.
  • the crystalline silicon-based solar cell string 110 and the perovskite-based solar cell string 120 that is, the crystalline silicon-based solar cell 10 and the perovskite-based solar cell 20
  • the perovskite-based solar cell string 120 that is, the perovskite-based solar cell 20 can be protected from water vapor.
  • FIG. 4 is a stacked solar cell string according to this embodiment, and is a schematic exploded view showing the stacked solar cell string 1 in the solar cell module 100 shown in FIG. 1. Note that, since FIG. 4 is a schematic diagram, the position of the wiring member is not limited to the light receiving side, but also includes the case where it is on the back side.
  • the stacked solar cell string 1 is a multijunction type (tandem type) solar cell string including a crystalline silicon solar cell string 110 and a perovskite solar cell string 120.
  • the perovskite solar cell string 120 is stacked on the light-receiving side of the crystalline silicon solar cell string 110 with a string sealant 130 interposed therebetween. Crystalline silicon solar cell string 110 and perovskite solar cell string 120 are connected in parallel.
  • the stacked solar cell string 1 has a rectangular shape when viewed from the light receiving side.
  • the direction along the long sides of the stacked solar cell string 1 will be referred to as the longitudinal direction (Y direction)
  • the direction along the short sides of the stacked solar cell string 1 will be referred to as the short side direction (X direction).
  • Crystalline silicon-based solar cell string 110 includes a plurality of crystalline silicon-based solar cells 10.
  • the crystalline silicon solar cells 10 are arranged in the longitudinal direction (Y direction) of the solar cell string 1 and are connected in series by wiring members 115 such as tabs.
  • the crystalline silicon solar cells 10 may be arranged so that their ends are spaced apart. Alternatively, the crystalline silicon solar cells 10 may be arranged so that their ends partially overlap. In this way, a plurality of solar cells 10 have a stacked structure in which they are tilted uniformly in a certain direction, just like a roof is covered with tiles, so this method of arranging solar cells 10 is It is called the shingling method. Moreover, a plurality of solar cells 10 connected in a string shape is referred to as a solar cell string.
  • the crystalline silicon solar cell 10 includes a semiconductor substrate as a photoelectric conversion layer.
  • a semiconductor substrate absorbs light and generates optical carriers.
  • the semiconductor substrate is a crystalline silicon substrate such as single crystal silicon or polycrystalline silicon.
  • the semiconductor substrate may have a pyramid-shaped fine uneven structure called a texture structure on the light-receiving surface side. This reduces the reflection of incident light on the light receiving surface and improves the light confinement effect in the semiconductor substrate.
  • the semiconductor substrate may have a pyramid-shaped fine uneven structure called a texture structure on the back side. This increases the recovery efficiency of light that has passed through without being absorbed by the semiconductor substrate.
  • Examples of the crystalline silicon solar cell 10 include a diffusion type cell in which a second conductivity type diffusion layer is provided on the light-receiving surface side of a first conductivity type single crystal silicon substrate, and a diffusion type cell in which a second conductivity type diffusion layer is provided on the light receiving surface side of a first conductivity type single crystal silicon substrate, and a diffusion type cell in which a second conductivity type diffusion layer is provided on the light receiving surface side of a first conductivity type single crystal silicon substrate, and a diffusion type cell in which a second conductivity type diffusion layer is provided on the light receiving surface side of a first conductivity type single crystal silicon substrate.
  • Examples include a heterojunction cell provided with a system thin film.
  • the crystalline silicon-based solar cell 10 includes a conductive silicon-based thin film formed on the light-receiving surface side of the photoelectric conversion layer, and a silicon-based thin film formed on the back surface of the photoelectric conversion layer.
  • a conductive silicon-based thin film is formed on the side.
  • the single crystal silicon substrate may be p-type or n-type. When comparing holes and electrons, electrons have higher mobility, so when an n-type single crystal silicon substrate is used, conversion characteristics are particularly excellent.
  • the conductive silicon-based thin film is a p-type silicon-based thin film or an n-type silicon-based thin film.
  • an intrinsic silicon-based thin film is provided between the single-crystal silicon substrate serving as the photoelectric conversion layer and the conductive silicon-based thin film.
  • an intrinsic silicon-based thin film is provided on the surface of a single-crystal silicon substrate, surface passivation can be effectively performed while suppressing diffusion of impurities into the single-crystal silicon substrate.
  • an intrinsic amorphous silicon thin film as an intrinsic silicon-based thin film on the surface of a single-crystal silicon substrate, a high passivation effect on the surface of the single-crystal silicon substrate can be obtained.
  • the crystalline silicon solar cell 10 may be a double-sided electrode type (also referred to as double-sided junction type) cell or a back-electrode type (also referred to as back-surface junction type or back contact type) cell. good.
  • a back-electrode type cell compared to a double-sided electrode type cell, the output of the solar cell module can be improved, and the design of the solar cell module can be improved.
  • the crystalline silicon solar cell 10 may be a large-sized semiconductor substrate (wafer) of a specified size (for example, a 6-inch semi-square shape), or a half-cut cell obtained by cutting a large-sized semiconductor substrate (wafer) into two. It may be.
  • the semiconductor substrate may have a pyramid-shaped fine uneven structure called a texture structure on the light-receiving surface side.
  • the crystalline silicon solar cell 10 may have an uneven structure on the light-receiving surface side.
  • Perovskite solar cell string 120 includes a plurality of perovskite solar cells 20.
  • the perovskite solar cell 20 extends across the plurality of crystalline silicon solar cells 10 in the longitudinal direction (Y direction) of the solar cell string 1 .
  • the perovskite solar cells 20 are arranged in the transverse direction (X direction) of the solar cell string 1, and are connected in parallel by wiring members 125 such as tabs.
  • the perovskite solar cell string 120 is a film type.
  • a plurality of perovskite solar cells 20 may be arranged and connected on one film-like base material. This improves the handling properties of the perovskite solar cell string 120. Further, it is possible to prevent the plurality of perovskite solar cells 20 from falling apart. Further, it can be handled in the same way as a crystalline silicon solar cell string.
  • the thickness in the stacking direction (Z direction) of the wiring member 125 connecting the plurality of perovskite solar cells 20 in the perovskite solar cell string 120 is the same as the thickness in the stacking direction (Z direction) of the wiring member 125 connecting the plurality of perovskite solar cells 20 in the perovskite solar cell string 120. It may be thinner than the thickness in the stack direction (Z direction) of the wiring member 115 that connects. As a result, it is possible to reduce irregularities in the pressure direction (Z direction) of the perovskite solar cell string 120, reduce cracks in the crystalline silicon solar cell 10, and prevent string sealing material 130 and module sealing. There is no need to make the material 5 thicker.
  • the perovskite solar cell 20 includes a thin semiconductor layer as a photoelectric conversion layer.
  • the semiconductor layer absorbs light and generates photocarriers.
  • the semiconductor layer has a different band gap from the semiconductor substrate of the crystalline silicon solar cell 10 described above. Therefore, the semiconductor substrate and the semiconductor layer described above have spectral sensitivity characteristics in different wavelength ranges. Therefore, in the solar cell module 100 in which the above-described crystalline silicon solar cell 10 and perovskite solar cell 20 are stacked, light with a wider wavelength can contribute to photoelectric conversion.
  • the thin film constituting the semiconductor layer includes an organic semiconductor thin film, specifically an organic-inorganic hybrid semiconductor thin film.
  • organic-inorganic hybrid semiconductor thin films include perovskite thin films containing a photosensitive material with a perovskite crystal structure.
  • the compound constituting the perovskite crystal material is represented by the general formula R 1 NH 3 M 1 X 3 or HC(NH 2 ) 2 M 1 X 3 .
  • R 1 is an alkyl group, preferably an alkyl group having 1 to 5 carbon atoms, and particularly preferably a methyl group.
  • M1 is a divalent metal ion, preferably Pb or Sn.
  • X is a halogen, and examples thereof include F, Cl, Br, and I. Note that the three X's may all be the same halogen element, or a plurality of halogens may be mixed.
  • a preferable example of the compound constituting the perovskite crystal material is a compound represented by the formula CH 3 NH 3 Pb(I 1-x Br x ) 3 (0 ⁇ x ⁇ 1).
  • the spectral sensitivity characteristics of perovskite materials can be changed by changing the type and ratio of halogen.
  • a perovskite semiconductor thin film can be formed by various dry processes or solution deposition such as spin coating.
  • FIG. 5 is a schematic cross-sectional view of the perovskite solar cell 20 of the perovskite solar cell string 120 in the stacked solar cell string 1 shown in FIG.
  • the perovskite solar cell 20 may be divided into a plurality of subcells 20s connected in series in the transverse direction (X direction) of the solar cell string 1. This makes it possible to shorten the conduction distance in the lateral direction (X direction) and reduce the amount of current per one subcell 20s.
  • the electrodes 24 and 25, especially made of transparent electrodes (ITO) Resistance loss due to the electrodes 24 and 25 can be reduced.
  • ITO transparent electrodes
  • the subcell 20s is formed on a film-like base material 20b.
  • the material for the base material 20b include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), glass, and the like.
  • the subcell 20s has a perovskite layer 21 as a photoelectric conversion layer and charge transport layers 22 and 23.
  • One of the charge transport layers 22 and 23 is a hole transport layer, and the other is an electron transport layer.
  • Examples of materials for the hole transport layer include polythiophene derivatives such as poly-3-hexylthiophene (P3HT) and poly(3,4-ethylenedioxythiophene) (PEDOT), 2,2',7,7'- Fluorene derivatives such as tetrakis-(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (Spiro-OMeTAD), carbazole derivatives such as polyvinylcarbazole, triphenylamine derivatives, diphenylamine derivatives, polysilanes derivatives, polyaniline derivatives, etc.
  • P3HT poly-3-hexylthiophene
  • PEDOT poly(3,4-ethylenedioxythiophene)
  • Spiro-OMeTAD 2,2',7,7'- Fluorene derivatives such as tetrakis-(N,N-di-p-methoxyphenylamine)-9,9
  • Examples of materials for the electron transport layer include metal oxides such as titanium oxide, zinc oxide, niobium oxide, zirconium oxide, and aluminum oxide.
  • An electrode 24 for taking out photogenerated carriers is formed on the charge transport layer 22 side of the subcell 20s.
  • An electrode 25 for extracting photogenerated carriers is formed on the charge transport layer 23 side of the subcell 20s.
  • the electrode 24 may include a transparent electrode and a metal electrode, may include only a transparent electrode, or may include only a metal electrode.
  • the electrode 25 may include a transparent electrode and a metal electrode, only a transparent electrode, or only a metal electrode.
  • the transparent electrode metal oxides such as ITO, zinc oxide, and tin oxide are preferably used.
  • the metal electrode silver, copper, aluminum, etc. are preferably used.
  • the difference between the open-circuit voltage Voc of the crystalline silicon-based solar cell string 110 and the open-circuit voltage Voc of the perovskite-based solar cell string described above is 10% or less of the open-circuit voltage of the crystalline silicon-based solar cell string. It is preferable to have one.
  • the Voc of the crystalline silicon solar cell 10 is 0.74V.
  • a half-cut cell with a size of 156.8 mm in size and 78.4 mm in width is used.
  • the perovskite solar cell string 120 three perovskite solar cells 20 are connected in parallel.
  • the crystalline silicon-based solar cell string 110 and the perovskite-based solar cell string 120 have substantially the same Voc and substantially the same size.
  • the string sealing material 130 is disposed between the crystalline silicon solar cell string 110 and the perovskite solar cell string 120, and seals between the crystalline silicon solar cell string 110 and the perovskite solar cell string 120. , the crystalline silicon solar cell string 110 and the perovskite solar cell string 120 are bonded together.
  • the material of the string sealing material 130 is not particularly limited, but preferably has the property of transmitting light (translucency). Further, the material of the string sealing material 130 preferably has adhesive properties that allow the crystalline silicon solar cell string 110 and the perovskite solar cell string 120 to be bonded together. Examples of such materials include ethylene/vinyl acetate copolymer (EVA), ethylene/ ⁇ -olefin copolymer, ethylene/vinyl acetate/trialyl isocyanurate (EVAT), polyvinyl butyrate (PVB), and acrylic. Transparent resins such as resins, urethane resins, and silicone resins may be used.
  • EVA ethylene/vinyl acetate copolymer
  • EVAT ethylene/ ⁇ -olefin copolymer
  • EVAT ethylene/vinyl acetate/trialyl isocyanurate
  • PVB polyvinyl butyrate
  • Transparent resins such as resins, urethane resins
  • the string sealing material 130 does not contain a crosslinking agent (for example, a crosslinking agent that may be included in the module sealing material 5 described above). Details regarding the crosslinking agent in the string sealing material 130 will be described later.
  • a crosslinking agent for example, a crosslinking agent that may be included in the module sealing material 5 described above. Details regarding the crosslinking agent in the string sealing material 130 will be described later.
  • the thickness of the string sealing material 130 in the stacking direction (Z direction) is thicker than the height difference dimension of the uneven structure of the solar cells 10 of the solar cell string 110. Thereby, the insulation distance between the crystalline silicon solar cell string 110 and the perovskite solar cell string 120 can be maintained. Furthermore, the space between the crystalline silicon solar cell string 110 and the perovskite solar cell string 120 can be sealed without any gaps.
  • the string sealing material 130 and the film-like perovskite solar cell string 120 are arranged in an uneven manner along the uneven structure of the solar cells 10 of the solar cell string 110.
  • the thickness in the stacking direction (Z direction) of the portion corresponding to the convex part in the concave-convex structure is the same as that in the concave-convex structure. It is thinner than the thickness in the stack direction (Z direction) of the portion corresponding to the recess.
  • the string encapsulant 130 and the film-like perovskite solar cell string 120 are arranged in an uneven manner along the uneven structure of the solar cells 10 of the solar cell string 110, thereby forming a crystalline silicon solar cell. An insulation distance between string 110 and perovskite solar cell string 120 can be maintained.
  • the wiring members 125 at both ends of the perovskite solar cell string 120 in the X direction are crystalline in the stack direction (Z direction).
  • a method for manufacturing a solar cell module Next, as shown in FIG. 4, a crystalline silicon solar cell string 110 in which crystalline silicon solar cells 10 are connected in series, and a perovskite solar cell string 120 in which perovskite solar cells 20 are connected in parallel. are stacked via string encapsulant 130. Next, the stacked crystalline silicon-based solar cell string 110, perovskite-based solar cell string 120, and string sealing material 130 are pressurized and heated. In this way, the crystalline silicon-based solar cell string 110 and the perovskite-based solar cell string 120 are bonded together using the string sealing material 130 to produce the stacked solar cell string 1 (stacking step).
  • the stacked solar cell string 1 is laminated between the light-receiving side protection member 3 and the back side protection member 4 with a module sealing material 5 interposed therebetween.
  • the laminated stacked solar cell string 1, the light-receiving side protection member 3, the back side protection member 4, and the module sealing material 5 are pressurized and heated. In this way, the module sealing material 5 is crosslinked and cured to produce the solar cell module 100 (lamination step).
  • the string sealing material 130 does not contain a crosslinking agent. According to this, even when heated in the stacking process, the string encapsulant 130 of the stacked solar cell string 1 is not crosslinked, and the string encapsulant 130 is regenerated during pressurization and heating in the subsequent laminating process. Flowing allows the stacked solar cell string 1 to fit easily into the solar cell module 100. For example, the flexibility of the stacked solar cell string 1 can be obtained with respect to stress generated within the module. More specifically, by reflowing the string sealing material 130, the stress generated within the module is dispersed, and the residual stress between each member in the stacked solar cell string 1 and each member around it is reduced. do.
  • the perovskite solar cell string 120 is stacked on the light receiving side of the crystalline silicon solar cell string 110 with the string sealant 130 interposed therebetween. There is.
  • the crystalline silicon solar cell string 110 and the perovskite solar cell string 120 are It is possible to reduce gaps (for example, air bubbles) between the
  • a crystalline silicon solar cell string 110 is made up of 12 crystalline silicon solar cells 10 connected in series
  • a perovskite solar cell string is made up of three perovskite solar cells 20 connected in parallel.
  • the string 120 has substantially the same size and has substantially the same voltage.
  • Stack type solar cell string 3 Light receiving side protection member 4 Back side protection member 5 Sealing material (module sealing material) 10 Crystalline silicon solar cell 20 Perovskite solar cell 20s Subcell 20b Base material 21 Photoelectric conversion layer (perovskite thin film) 22, 23 Charge transport layer 24, 25 Electrode 100 Solar cell module 110 Crystalline silicon solar cell string 115, 125 Wiring member 120 Perovskite solar cell string 130 String sealing material

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Abstract

La présente invention concerne une chaîne de cellules solaires de type à empilement présentant un espacement réduit entre deux types de chaînes de cellules solaires constituées de deux types de cellules solaires. Cette chaîne de cellules solaires de type à empilement (1) comprend une chaîne de cellules solaires en silicium cristallin (110) comprenant une pluralité de cellules solaires en silicium cristallin (10), une chaîne de cellules solaires en pérovskite (120) comprenant une pluralité de cellules solaires en pérovskite (20) et un matériau d'étanchéité de chaîne (130) qui est disposé entre la chaîne de cellules solaires en silicium cristallin (110) et la chaîne de cellules solaires en pérovskite (120) et qui fournit un joint d'étanchéité entre la chaîne de cellules solaires en silicium cristallin (110) et la chaîne de cellules solaires en pérovskite (120). La chaîne de cellules solaires en pérovskite (120) est empilée sur le côté de réception de lumière de la chaîne de cellules solaires en silicium cristallin (110), le matériau d'étanchéité de chaîne (130) étant interposé entre les deux.
PCT/JP2023/005545 2022-03-25 2023-02-16 Chaîne de cellules solaires de type à empilement, module de cellules solaires et procédé de fabrication de module de cellules solaires WO2023181733A1 (fr)

Applications Claiming Priority (2)

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