WO2017056369A1 - Module de cellule solaire - Google Patents

Module de cellule solaire Download PDF

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Publication number
WO2017056369A1
WO2017056369A1 PCT/JP2016/003697 JP2016003697W WO2017056369A1 WO 2017056369 A1 WO2017056369 A1 WO 2017056369A1 JP 2016003697 W JP2016003697 W JP 2016003697W WO 2017056369 A1 WO2017056369 A1 WO 2017056369A1
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WO
WIPO (PCT)
Prior art keywords
solar cell
cell module
resin
protective member
sealing member
Prior art date
Application number
PCT/JP2016/003697
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English (en)
Japanese (ja)
Inventor
淳平 入川
祐 石黒
Original Assignee
パナソニックＩｐマネジメント株式会社
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Filing date
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to JP2017542685A priority Critical patent/JP6621037B2/ja
Publication of WO2017056369A1 publication Critical patent/WO2017056369A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0216—Coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/055—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means where light is absorbed and re-emitted at a different wavelength by the optical element directly associated or integrated with the PV cell, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/52—PV systems with concentrators

Definitions

  • the present invention relates to a solar cell module, and more particularly to a solar cell module including a wavelength conversion substance.
  • the solar cell module for converting sunlight into electrical energy is clean renewable energy.
  • the solar cell module is configured to enclose a solar cell between two environmental protection covers.
  • the environmental protection cover is configured to prevent moisture and oxygen from penetrating.
  • the solar cell module includes a resin material including two environmental protection covers and a sealing member sealed therebetween.
  • an ultraviolet absorber may be added to the resin material. However, when an ultraviolet absorber is added to the resin material, the amount of incident light contributing to power generation of the solar cell module is reduced.
  • oxygen permeability and water vapor permeability are likely to increase. If oxygen or water vapor enters the inside of the solar cell module, for example, a material sealed in an environmental protection cover such as a wavelength converting substance may be deteriorated.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique for improving durability against water vapor permeation into the solar cell module and increasing the power generation efficiency of the solar cell module.
  • a solar cell module is disposed on a solar cell, a first protection member disposed on a light receiving surface side of the solar cell, and a back surface side of the solar cell.
  • the first sealing member is a wavelength conversion substance that absorbs light of a specific wavelength and converts the wavelength, and contains a wavelength conversion substance formed of an organic material.
  • the water vapor transmission rate of the second protective member is 1 g / m 2 / day or less.
  • durability against the penetration of water vapor into the solar cell module can be enhanced, and the power generation efficiency of the solar cell module can be increased.
  • FIGS. 5A to 5B are cross-sectional views showing the configuration of the second protective member according to Embodiment 2 of the present invention.
  • Example 1 of this invention is related with the solar cell module provided with the several photovoltaic cell.
  • the wavelength conversion substance is provided in the solar cell module. Since the wavelength conversion material absorbs light of a specific wavelength and converts the wavelength, the light in the wavelength region that has a small contribution to power generation out of incident light is converted into light in the wavelength region that has a large contribution to power generation. Improve the photoelectric conversion efficiency of the module.
  • a wavelength conversion substance is disposed on the light receiving surface side of the solar cell. As such a wavelength conversion substance, it is effective to use an organic material.
  • the solar battery cell and the wavelength conversion substance are sealed by two protective members.
  • a resin sheet is preferably used as the protective member on the back side.
  • oxygen and water vapor penetrate into the solar cell module through the resin sheet.
  • the organic material is easily deteriorated, and the wavelength conversion efficiency of the wavelength conversion substance is lowered.
  • a protective member having a water vapor transmission rate of not more than g / m 2 / day is used.
  • FIG. 1 is a top view showing a solar cell module 100 according to Example 1 of the present invention.
  • a rectangular coordinate system composed of an x-axis, a y-axis, and a z-axis is defined.
  • the x axis and the y axis are orthogonal to each other in the plane of the solar cell module 100.
  • the z axis is perpendicular to the x axis and the y axis and extends in the thickness direction of the solar cell module 100.
  • the positive directions of the x-axis, y-axis, and z-axis are each defined in the direction of the arrow in FIG. 1, and the negative direction is defined in the direction opposite to the arrow.
  • the main plane disposed on the positive side of the z-axis is a “light-receiving surface”.
  • the main plane disposed on the negative direction side of the z-axis is the “back surface”.
  • the “light receiving surface” means a surface on which light is mainly incident, and the “back surface” may mean a surface opposite to the light receiving surface.
  • the positive direction side of the z-axis may be referred to as “light-receiving surface side”
  • the negative direction side of the z-axis may be referred to as “back surface side”.
  • the first member and the second member may be provided in direct contact unless otherwise specified. There may also be other members between the second member. Further, “substantially” indicates that they are different within the error range, that is, substantially the same.
  • the solar cell module 100 includes an eleventh solar cell 10aa, a twenty-first solar cell 10ba, a twelfth solar cell 10ab, a twenty-second solar cell 10bb, a thirteenth solar cell 10ac, 23 solar cell 10bc, eleventh tab line 40aa, twelfth tab line 40ab, thirteenth tab line 40ac, fourteenth tab line 40ad, fifteenth tab line 40ae, sixteenth tab line 40af, 21 tab line 40ba, 22nd tab line 40bb, 23rd tab line 40bc, 24th tab line 40bd, 25th tab line 40be, and 26th tab line 40bf.
  • the plurality of solar cells 10 are arranged in a matrix on the xy plane.
  • two solar cells 10 are arranged in the x-axis direction, and three solar cells 10 are arranged in the y-axis direction.
  • the number of the photovoltaic cells 10 is not limited to six.
  • a plurality of solar cells 10 arranged side by side in the x-axis direction for example, an eleventh solar cell 10aa and a twenty-first solar cell 10ba are connected in series by a twenty-first tab line 40ba and a twenty-second tab line 40bb, One string is formed.
  • the twenty-first tab line 40ba and the twenty-second tab line 40bb are a bus bar electrode (not shown) on the back surface side of the eleventh solar cell 10aa and a bus bar electrode on the light receiving surface side of the twenty-first solar cell 10ba. (Not shown) is electrically connected.
  • another string is formed by making the same connection also with respect to the other photovoltaic cell 10. As a result, in FIG. 1, three strings in the x-axis direction are arranged in parallel to the y-axis direction.
  • a plurality of strings in which a plurality of solar cells 10 are arranged in the x-axis direction are arranged in the y-axis direction, and formed into a plate-like body having a substantially rectangular shape in the xy plane.
  • a frame (not shown) may be attached to the edge portion of the solar cell module 100. The frame protects the edge of the solar cell module 100 and is used when the solar cell module 100 is installed on a roof or the like.
  • FIG. 2A shows a plan view of the solar cell 10 on the light receiving surface side.
  • the plurality of finger electrodes 22 are arranged in parallel.
  • one finger electrode 22 extends in the y-axis direction.
  • the finger electrode 22 is an electrode that collects electric power generated by light reception. Since the finger electrode 22 is an electrode formed on the light receiving surface, it is desirable to form the finger electrode 22 so as not to block incident light. In addition, it is desirable to arrange the generated power at predetermined intervals so that the generated power can be collected efficiently.
  • the plurality of bus bar electrodes 24 are also arranged in parallel on the light receiving surface side of the solar battery cell 10. Each bus bar electrode 24 is arranged so as to intersect, for example, orthogonally, with the finger electrodes 22 to connect the plurality of finger electrodes 22 to each other.
  • FIG. 2A as the plurality of bus bar electrodes 24, a first bus bar electrode 24a and a second bus bar electrode 24b extending in the x-axis direction are shown. It is desirable that the bus bar electrode 24 is formed to be thin to the extent that incident light is not blocked, and is thickened to some extent so that the power collected from the plurality of finger electrodes 22 can flow efficiently.
  • Each of the plurality of tab wires 40 is bonded on the light receiving surface so as to be electrically connected to the bus bar electrode 24.
  • the first tab line 40a is connected to the first bus bar electrode 24a
  • the second tab line 40b is connected to the second bus bar electrode 24b.
  • each tab wire 40 is also connected to the adjacent solar battery cell 10 (not shown) as described above.
  • the tab line 40 is arranged in the same direction as the bus bar electrode 24.
  • the tab wire 40 is an elongated metal foil, for example, a copper foil coated with solder, silver or the like.
  • FIG. 2B shows a plan view of the back side of the solar battery cell 10.
  • the plurality of finger electrodes 32 are arranged in parallel on the back surface side of the solar battery cell 10.
  • one finger electrode 32 extends in the y-axis direction, like the finger electrode 22.
  • the number of finger electrodes 32 is made larger than the number of finger electrodes 22. With such a configuration, current collection efficiency is increased.
  • the number of finger electrodes 32 may be the same as the number of finger electrodes 22 or may be smaller than the number of finger electrodes 22.
  • the plurality of bus bar electrodes 34 are the same as the plurality of bus bar electrodes 24 in FIG. 2A, and the third tab line 40c and the fourth tab line 40d are the first tab line 40a and the second tab line 40d in FIG. Since it is the same as the tab line 40b, description is abbreviate
  • a light receiving surface side protective film (not shown) for preventing the surface of the solar cell from being scratched is disposed.
  • the light-receiving surface side protective film is applied to the entire surface in order to protect the surface of the solar battery cell 10, but is not applied on the tab wire 40. This is because the adhesive property of the tab wire 40 is not affected.
  • the light receiving surface side protective film contains an epoxy resin.
  • the epoxy resin is a general term for thermosetting resins that can be cured by forming a crosslinked network with epoxy groups remaining in the polymer.
  • the epoxy resin is completed by mixing a prepolymer before cross-linking network and a curing agent and heat-curing, but the prepolymer and the resin that has been commercialized are sometimes called epoxy resins.
  • the light-receiving surface side protective film is not limited to the one containing an epoxy resin, and may contain polyethylene terephthalate (PET).
  • FIG. 3 is a cross-sectional view showing the solar cell module 100. This corresponds to a cross-sectional view in the A-A ′ direction of FIG. 1 and is an enlarged view of a peripheral portion of one solar battery cell 10.
  • the solar battery module 100 includes a solar battery cell 10, a first protection member 12, a second protection member 14, a first sealing member 16, and a second sealing member 18. Further, the first sealing member 16 contains the wavelength conversion substance 20.
  • the solar battery cell 10 absorbs incident light and generates photovoltaic power.
  • the solar battery cell 10 includes, for example, a semiconductor substrate, an amorphous semiconductor layer formed on the substrate, and a transparent conductive layer formed on the amorphous semiconductor layer.
  • a semiconductor constituting the semiconductor substrate is crystalline silicon (c-Si), gallium arsenide (GaAs), indium phosphide (InP), or the like.
  • An example of an amorphous semiconductor constituting the amorphous semiconductor layer is i-type amorphous silicon, n-type amorphous silicon, p-type amorphous silicon, and the like.
  • the transparent conductive layer is made of a transparent conductive oxide obtained by doping metal oxide such as indium oxide (In 2 O 3 ) or zinc oxide (ZnO) with tin (Sn), antimony (Sb), or the like. .
  • an n-type single crystal silicon substrate is used as the semiconductor substrate. Further, an i-type amorphous silicon layer, a p-type amorphous silicon layer, and a transparent conductive layer are sequentially formed on the light-receiving surface of the n-type single crystal silicon substrate, and an i-type amorphous silicon layer is formed on the back surface of the substrate, An n-type amorphous silicon layer and a transparent conductive layer are formed in this order.
  • a p-type amorphous silicon layer may be formed on the back surface of the n-type single crystal silicon substrate, and an n-type amorphous silicon layer may be formed on the light receiving surface side of the substrate.
  • the solar cell 10 has a heterojunction that is a junction between semiconductors having different optical gaps.
  • An amorphous silicon layer (thickness: several to several tens of nm) forming a heterojunction generally absorbs light having a wavelength of 600 nm or less.
  • the photoelectric conversion efficiency of the solar battery cell 10 is generally higher at the wavelength of visible light than the wavelength of ultraviolet light.
  • a light receiving surface side protective film for preventing the surface of the solar cell 10 from being scratched is formed.
  • the light receiving surface side protective film contains an epoxy resin.
  • the epoxy resin is a general term for thermosetting resins that can be cured by forming a crosslinked network with epoxy groups remaining in the polymer.
  • the epoxy resin is completed by mixing a prepolymer before cross-linking network and a curing agent and heat-curing, but the prepolymer and the resin that has been commercialized are sometimes called epoxy resins.
  • a back surface side protective film may be formed on the back surface side of the solar battery cell 10.
  • the back surface side protective film may be configured similarly to the light receiving surface side protective film.
  • the epoxy resin has a transmittance of 80% or more at a wavelength of 370 nm or more, but when the wavelength is lower than that, the transmittance is greatly reduced. That is, light having a wavelength of approximately 360 nm or less is absorbed by the epoxy resin. Therefore, the epoxy resin is deteriorated by ultraviolet rays.
  • the first protective member 12 is disposed on the light receiving surface side of the solar battery cell 10 and protects the solar battery cell 10 from the external environment and transmits light in a wavelength band that the solar battery cell 10 absorbs for power generation.
  • a light-transmissive member such as a glass substrate, a resin substrate, a resin film, or the like is used.
  • the use of a glass substrate is preferable from the viewpoints of fire resistance, durability, and the like.
  • the 1st sealing member 16 is arrange
  • the first sealing member 16 is also called a filler layer or a filler.
  • the first sealing member 16 has transparency that can sufficiently transmit sunlight.
  • the first sealing member 16 is formed of a resin material such as polyolefin such as polyethylene or polypropylene, polyvinyl butyral (PVB), polyimide, or polyethylene terephthalate (PET). Of these, use of an olefin resin (particularly, a polymer containing ethylene) is preferable.
  • the first sealing member 16 contains a wavelength converting substance 20, and the wavelength converting substance 20 is indicated by a white circle in FIG.
  • the wavelength converting material 20 is a material that absorbs light of a specific wavelength and converts the wavelength, and plays a role of converting light in a wavelength region that has a small contribution to power generation into light in a wavelength region that has a large contribution to power generation.
  • the wavelength converting substance 20 absorbs ultraviolet light, for example, light having a wavelength shorter than 380 nm, and converts it into light having a longer wavelength (for example, 400 nm to 800 nm).
  • the wavelength converting substance 20 preferably absorbs ultraviolet rays and emits visible light, but may absorb visible light or infrared light.
  • the wavelength conversion material 20 converts light having a short wavelength into light having a longer wavelength.
  • a preferable conversion wavelength depends on the type of the solar battery cell 10. As described above, since the solar battery cell 10 has the heterojunction layer (amorphous semiconductor layer), it is desirable that the wavelength converting material 20 absorbs light having low transmittance in the heterojunction layer and converts the wavelength. It is. That is, the wavelength conversion substance 20 converts light having a wavelength that is easily absorbed by the heterojunction layer.
  • the wavelength conversion substance 20 may cause so-called up-conversion light emission that converts light having a long wavelength into light having a shorter wavelength.
  • the wavelength converting substance 20 is formed of, for example, an organic material.
  • a perylene dye, a benzotriazole dye, a benzothiadiazole dye, a perylene diester derivative, a porphyrin dye, a terylene dye, or a phthalocyanine dye is used. More specifically, for example, TBPe (2,5,8,11-Tetra-tert-butylperylene), BCzVBi (4,4′-Bis (9-ethyl-3-carbazovinylene) -1,1′-biphenyl) ) Is used.
  • the concentration of the wavelength converting substance 20 in the first sealing member 16 is, for example, 0.02 to 2.0% by weight, particularly 0.05 to 0.8% by weight.
  • the epoxy resin contained in the light-receiving surface side protective film or the like is deteriorated by ultraviolet rays.
  • the wavelength converting material 20 absorbs ultraviolet rays and emits visible light, so that the amount of ultraviolet rays received by the epoxy resin contained in the light receiving surface side protective film or the like is reduced, and the epoxy resin is deteriorated by the ultraviolet rays. It is suppressed.
  • the second sealing member 18 is disposed between the back surface side of the solar battery cell 10 and the second protective member 14. Therefore, the 1st sealing member 16 and the 2nd sealing member 18 are pinched between the 1st protection member 12 and the 2nd protection member 14, and the photovoltaic cell 10 is the 1st sealing member 16, Sealed by the second sealing member 18. Similar to the first sealing member 16, the second sealing member 18 is formed of a resin material. The resin material used for the second sealing member 18 may be the same as or different from the resin material used for the first sealing member 16.
  • the second protective member 14 is disposed on the back side of the second sealing member 18, that is, on the back side of the solar battery cell 10. Similar to the first protection member 12, the second protection member 14 protects the solar battery cell 10 from the external environment. As described above, unlike the first protection member 12, a resin film thinner than the first protection member is used for the second protection member 14 for the purpose of reducing the weight of the solar cell module 100. When a resin film is used for the second protection member 14, the water vapor 50 penetrates from the second protection member 14 into the solar cell module 100. In FIG. 3, the water vapor 50 is indicated by black circles. The permeated water vapor 50 is also included in the first sealing member 16 and the second sealing member 18.
  • the wavelength conversion material 20 When the first sealing member 16 receives light in a state where the water vapor 50 is present in the vicinity of the wavelength conversion material 20, the wavelength conversion material 20 is likely to deteriorate. When the wavelength conversion material 20 deteriorates, the wavelength conversion efficiency of the wavelength conversion material 20 decreases, and the photoelectric conversion efficiency of the solar cell module 100 decreases. In order to suppress this, it is desirable to suppress the penetration of the water vapor 50 into the solar cell module 100.
  • FIG. 4 shows the reflectance versus irradiation time according to the water vapor transmission rate of the second protective member 14.
  • the vertical axis represents the reflectance
  • the horizontal axis represents the irradiation time.
  • the definition of reflectance will be described before describing FIG. 3
  • the reflectance is (1) the amount of light applied to the solar cell module 100 from the positive side of the z-axis with respect to the first protective member 12, and (2) the reflection on the solar cell module 100 and This is the ratio of the amount of light returning to the positive direction side.
  • ultraviolet rays are used to irradiate the solar cell module 100.
  • the reflection in the solar cell module 100 is mainly classified into the following two.
  • the first is reflection on the surface of the first protective member 12.
  • the reflectance of ultraviolet rays on the surface of the first protective member 12 is about 4%.
  • the second is light emission by the wavelength conversion substance 20 in the first sealing member 16. This will be described in more detail.
  • the wavelength converting substance 20 emits light by wavelength conversion.
  • the emitted light is directed toward the light receiving surface side of the solar battery cell 10, is directed toward the solar battery cell 10 along the light receiving surface, or is transmitted through the first protective member 12 to the outside of the solar battery module 100. I head for it.
  • the last component is a reflection component, and the reflectivity varies depending on the characteristics of the wavelength conversion material 20 and is about 4% to 16%.
  • An increase in the ratio of this component corresponds to an increase in the amount of ultraviolet light absorbed by the wavelength conversion material 20. If the amount of ultraviolet light absorbed by the wavelength conversion substance 20 is increased, the amount of emitted light is also increased, so that the photoelectric conversion efficiency is improved. That is, in FIG. 4, even if the irradiation time is long, if the reflectance is not low, it can be said that the wavelength conversion material 20 is less deteriorated. In this case, the penetration of water vapor is sufficiently suppressed by the second protective member 14.
  • the reflectance is about 20% at the maximum, but the reflectance is reduced to about 8% when wavelength conversion by the wavelength converting material 20 is not performed.
  • the reflectance is measured at a specific measurement point in the solar cell module 100 using the plurality of second protective members 14 having different water vapor transmission rates.
  • the specific measurement point is set to a place where the reflectance is likely to change when the light irradiation time is increased.
  • the first sample 202 shows a case where the second protective member 14 having a water vapor transmission rate in the range of 1 to 10 g / m 2 / day is used.
  • the second sample 206 shows the case where the second protective member 14 having a water vapor transmission rate in the range of 0.1 to 1 g / m 2 / day is used.
  • the third sample 210 shows a case where the second protective member 14 having a water vapor transmission rate in the range of 0.01 to 0.1 g / m 2 / day is used.
  • the water vapor transmission rates of the first sample 202, the second sample 206, and the third sample 210 are measured under the conditions of a measurement temperature of 40 ° C. and a measurement humidity of 90% as defined in the Japanese Industrial Standard (JIS) standard number K7126. .
  • JIS Japanese Industrial Standard
  • the first sample 202 is indicated by a black square mark
  • the second sample 206 is indicated by a cross mark
  • the third sample 210 is indicated by a black circle mark.
  • the reflectances of the second sample 206 and the third sample 210 are substantially the same even when the irradiation time is 5000 hours. However, the reflectance of the first sample 202 greatly decreases from the reflectance of the second sample 206 when the irradiation time reaches 5000 hours.
  • the water vapor transmission rate of the second protective member 14 is in the range of 1 to 10 g / m 2 / day, the penetration of the water vapor 50 by the second protective member 14 is too much, and the wavelength conversion material 20 by the water vapor 50 It can be said that the influence of deterioration is large.
  • the water vapor transmission rate of the second protective member 14 is in the range of 0.1 to 1 g / m 2 / day, it is in the range of 0.01 to 0.1 g / m 2 / day. Even if it exists, the influence of deterioration of the wavelength conversion substance 20 by the water vapor
  • a resin having a high barrier property is used for the second protective member 14.
  • polyvinyl alcohol poval resin made from polyvinyl alcohol, polyacrylonitrile, polyester resin, polyamide resin, polystyrene, polymethyl methacrylate, nylon, ethylene vinyl alcohol copolymer, polyvinylidene chloride, metaxylene diamine .
  • the second sealing member 18 is formed of a non-EVA resin material.
  • Non-EVA resin materials are, for example, polyolefins such as polyethylene or polypropylene, PVB, silicon resin, polyimide, PET, and the like.
  • the solar cell module 100 is a resin that constitutes the first protection member 12, the second protection member 14, the first sealing member 16, and the second sealing member 18 from the strings of the solar cells 10 connected by the tab wires 40. It is manufactured by laminating using a sheet. In the laminating apparatus, for example, on the heater, the first protective member 12, the resin sheet constituting the first sealing member 16, the string of solar cells 10, the resin sheet constituting the second sealing member 18, the second protective member 14 are sequentially stacked. The resin sheet constituting the first sealing member 16 contains the wavelength conversion substance 20. This laminated body is heated to about 150 ° C. in a vacuum state, for example. Thereafter, heating is continued while pressing each component member on the heater side under atmospheric pressure to crosslink the resin component of the resin sheet. Furthermore, the solar cell module 100 is obtained by attaching the frame.
  • the water vapor transmission rate of the second protective member is 1 g / m 2 / day or less, the penetration of water vapor into the solar cell module can be suppressed. Moreover, since a resin sheet is used for the 2nd protection member, a solar cell module can be reduced in weight. In addition, since the water vapor transmission rate of the second protective member is 1 g / m 2 / day or less, even when the wavelength converting substance formed of the organic material is contained in the first sealing member, the wavelength converting substance by oxygen Can be prevented. Moreover, since deterioration of the wavelength conversion substance is suppressed, deterioration of photoelectric conversion efficiency can be suppressed. Further, since the second protective member is a barrier material for setting the water vapor transmission rate to 1 g / m 2 / day or less, the configuration can be simplified.
  • the second sealing member is formed of a non-EVA resin material, the generation of acetic acid can be suppressed even when moisture enters the second sealing member. Moreover, since generation
  • the solar cell module 100 includes a solar cell 10, a first protective member 12 disposed on the light receiving surface side of the solar cell 10, and a second disposed on the back surface side of the solar cell 10.
  • the 1st sealing member 16 is the wavelength conversion substance 20 which absorbs the light of a specific wavelength, and converts a wavelength, and contains the wavelength conversion substance 20 formed with an organic type material.
  • the water vapor transmission rate of the second protective member 14 is 1 g / m 2 / day or less.
  • the first protective member 12 may be a glass substrate, and the second protective member 14 may be a resin film thinner than the first protective member 12.
  • the first sealing member 16 and the second sealing member 18 may be formed of a non-ethylene vinyl acetate copolymer (EVA) resin material.
  • EVA non-ethylene vinyl acetate copolymer
  • a member containing an epoxy resin or a member containing polyethylene terephthalate may be disposed on the light receiving surface side of the solar battery cell 10.
  • the second protective member 14 is made of polyvinyl alcohol, poval resin made from polyvinyl alcohol, polyacrylonitrile, polyester resin, polyamide resin, polystyrene, polymethyl methacrylate, nylon, ethylene vinyl alcohol copolymer, polyvinylidene chloride, meta Any of xylene diamine may be included.
  • the second protective member 14 may be a barrier material for reducing the water vapor transmission rate to 1 g / m 2 / day or less.
  • Example 2 is similar to Example 1, and relates to a solar cell module that includes a plurality of solar cells and a wavelength conversion substance of an organic material and uses a resin sheet as one protective member. Also in Example 2, in order to maintain the photoelectric conversion efficiency of the solar cell module, a protective member having a water vapor transmission rate of 1 g / m 2 / day or less is used. In Example 1, the water vapor permeability of the entire protective member is 1 g / m 2 / day or less. On the other hand, in Example 2, the protective member is composed of a resin layer and a barrier layer, and the water vapor transmission rate is 1 g / m 2 / day or less by the barrier layer.
  • the solar cell module according to Example 2 is the same type as that shown in FIGS. Here, the difference will be mainly described.
  • FIG. 5 (a)-(b) are cross-sectional views showing the configuration of the second protective member 14 according to the second embodiment of the present invention. These are sectional views in which a portion of the second protection member 14 in FIG. 3 is enlarged.
  • the second protective member 14 includes a resin layer 60 and a barrier layer 62, and an adhesive layer 64 is connected to the second protective member 14.
  • the resin layer 60 is disposed on the most negative side of the z-axis in the second protective member 14. This corresponds to the resin layer 60 being disposed on the most back side of the solar cell module 100.
  • the resin layer 60 is made of, for example, PET. PET is also deteriorated by ultraviolet rays.
  • the wavelength converting material 20 absorbs ultraviolet rays and emits visible light, so that the amount of ultraviolet rays received by the PET contained in the resin layer 60 is reduced, and deterioration of the resin layer 60 due to ultraviolet rays is suppressed. .
  • the barrier layer 62 is laminated on the positive side of the z-axis of the resin layer 60.
  • the barrier layer 62 is formed of a barrier material for reducing the water vapor transmission rate to 1 g / m 2 / day or less.
  • a barrier material for reducing the water vapor transmission rate to 1 g / m 2 / day or less.
  • SiO 2 , Al 2 O 3 , SiN, or Al is used as the barrier material.
  • the adhesive layer 64 is laminated on the positive side of the z-axis of the barrier layer 62. The adhesive layer 64 is used to connect the barrier layer 62 and the second sealing member 18.
  • FIG. 5B is different from FIG. 5A in the arrangement of the resin layer 60 and the barrier layer 62.
  • the barrier layer 62 is disposed on the most negative direction side of the z-axis in the second protective member 14. This corresponds to the barrier layer 62 being disposed on the most back surface side of the solar battery cell 10.
  • the resin layer 60 is stacked on the positive side of the z axis of the barrier layer 62.
  • the adhesive layer 64 is laminated on the positive side of the z-axis of the resin layer 60. The adhesive layer 64 is used to connect the resin layer 60 and the second sealing member 18.
  • the barrier layer formed of the barrier material for setting the water vapor transmission rate to 1 g / m 2 / day or less is laminated on the resin layer, it does not have such a water vapor transmission rate.
  • a resin layer can be used.
  • the outermost layer is a resin layer or a barrier layer, the degree of freedom in configuration can be improved.
  • the outline of the present embodiment is as follows.
  • the second protective member 14 may include a resin layer 60 and a barrier layer 62 that is laminated on the resin layer 60 and formed of a barrier material for reducing the water vapor transmission rate to 1 g / m 2 / day or less. .
  • the barrier material may include any of SiO 2 , Al 2 O 3 , SiN, and Al.
  • PET may be included in the second protective member 14, the first sealing member 16, and the second sealing member 18.
  • the present invention is not limited thereto.
  • PET may be included between adjacent solar cells 10 or included in the light-receiving surface side protective film of the solar cells 10.
  • the first sealing member 16 and the second sealing member 18 seal the solar battery cell 10 and are included in the first sealing member 16 and the second sealing member 18 in the manufacturing process.
  • the resin such as PET flows between the adjacent solar cells 10.
  • the resin such as PET contained in the first sealing member 16 and the second sealing member 18 is included between adjacent solar cells 10. According to this modification, even when such a portion contains PET, the wavelength conversion substance 20 contained in the first sealing member 16 can suppress deterioration due to ultraviolet rays.
  • the finger electrode 32 and the bus bar electrode 34 are disposed on the back surface side of the solar battery cell 10.
  • the present invention is not limited to this.
  • the entire back surface of the solar battery cell 10 may be configured as an electrode. According to this modification, the degree of freedom of configuration can be improved.
  • durability against the penetration of water vapor into the solar cell module can be enhanced, and the power generation efficiency of the solar cell module can be increased.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)

Abstract

Le premier élément de protection 12 est disposé du côté surface de réception de lumière d'une cellule solaire 10. Un second élément de protection 14 est disposé du côté surface arrière de la cellule solaire 10. Un premier élément d'étanchéité 16 est disposé entre la cellule solaire 10 et le premier élément de protection 12. Un second élément d'étanchéité 18 est disposé entre la cellule solaire 10 et le second élément de protection 14. Le premier élément d'étanchéité 16 contient une substance de conversion de longueur d'onde 20, qui absorbe la lumière ayant une longueur d'onde spécifique, et convertit la longueur d'onde, ladite substance de conversion de longueur d'onde 20 étant constituée d'un matériau organique. Le taux de transmission de vapeur d'eau du second élément de protection 14 est inférieur ou égal à 1 g/m2/jour.
PCT/JP2016/003697 2015-09-30 2016-08-10 Module de cellule solaire WO2017056369A1 (fr)

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