WO2010058585A1 - Feuille de réutilisation de lumière, module de batterie solaire et module de source lumineuse - Google Patents

Feuille de réutilisation de lumière, module de batterie solaire et module de source lumineuse Download PDF

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Publication number
WO2010058585A1
WO2010058585A1 PCT/JP2009/006237 JP2009006237W WO2010058585A1 WO 2010058585 A1 WO2010058585 A1 WO 2010058585A1 JP 2009006237 W JP2009006237 W JP 2009006237W WO 2010058585 A1 WO2010058585 A1 WO 2010058585A1
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Prior art keywords
light
solar cell
reuse sheet
incident
solar
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PCT/JP2009/006237
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English (en)
Japanese (ja)
Inventor
ルイス マヌエル ムリジョーモラ
本間英明
諸永耕平
高橋進
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凸版印刷株式会社
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Application filed by 凸版印刷株式会社 filed Critical 凸版印刷株式会社
Priority to CN200980146248.6A priority Critical patent/CN102217090B/zh
Priority to JP2010518186A priority patent/JP5068854B2/ja
Priority to EP09827366A priority patent/EP2355166A1/fr
Priority to US12/998,677 priority patent/US20110240095A1/en
Publication of WO2010058585A1 publication Critical patent/WO2010058585A1/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
    • H01L31/04—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
    • H01L31/056—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means the light-reflecting means being of the back surface reflector [BSR] type
    • 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
    • H01L31/0547—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H01L33/60—Reflective elements
    • 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 has a concavo-convex structure formed on at least one surface, deflects light in a specific direction by light diffraction, scattering, refraction, or reflection, and reuses light that has been lost in the past.
  • the present invention relates to a light reuse sheet that can be used, and a solar cell module and a light source module using the light reuse sheet. Furthermore, this invention relates to the sheet
  • solar cell modules are used in various fields.
  • solar cell modules are used in relatively small devices mounted on small electronic devices such as calculators, solar cell modules are installed in homes for home use, and large-area solar cell power generation in large-scale power generation facilities A system is used, and further, a solar cell module is used as a power source for an artificial satellite (see, for example, Patent Document 1).
  • the amount of power generation increases mainly in proportion to the area irradiated with light. Therefore, in order to improve the power generation efficiency, in addition to improving the manufacturing technology such as the sealing technology and the film forming technology, how to increase the aperture ratio of the solar cell module (the ratio of the area capable of power generation to the total area). Is an important issue.
  • the types of materials used in solar cells are classified into crystalline silicon, amorphous silicon, organic compound, and the like, and moreover, crystalline silicon solar cells that are widely distributed in the market are simple. It is classified into a crystalline silicon type, a polycrystalline silicon type, and an amorphous silicon type.
  • a single crystal silicon type or polycrystalline silicon type solar cell has an advantage in that it is relatively easy to increase power generation efficiency because the substrate quality is better than other solar cells.
  • a single crystal silicon type or polycrystalline silicon type solar cell has a problem that a material cost accounts for a high ratio (the cost of silicon is high). The cost for attaching the solar cell to the module is also added to the manufacturing cost.
  • the above-described method has a low light absorptivity because infrared light is likely to pass through thin-film silicon solar cells. Therefore, in order to increase the light utilization efficiency, a structure has been proposed in which incident light is intentionally scattered to improve the light utilization efficiency by increasing the optical path length of the light transmitted through the thin-film silicon solar cells. .
  • amorphous silicon solar cells In general, two types of structures are known for amorphous silicon solar cells.
  • a transparent conductive film such as SnO 2 or ITO (indium tin oxide) is formed on a translucent substrate such as glass, and a p-layer of an amorphous semiconductor (Si) is formed on the transparent conductive film.
  • a transparent conductive film and a back electrode are sequentially formed on a laminate composed of a p layer, an i layer, and an n layer.
  • an amorphous semiconductor (Si) n layer, i layer, and p layer are laminated in this order on a metal substrate electrode to form a photoelectric conversion active layer, and transparent on the photoelectric conversion active layer.
  • a structure in which a conductive film and a back electrode are laminated is known.
  • the first structure has the following advantages. Specifically, since the amorphous semiconductor is formed in the order of the pin layer, the light-transmitting insulating substrate can function as a base substrate of the solar cell, and the cover glass covers the surface of the solar cell. Can function as.
  • a transparent conductive film made of SnO 2 or the like having plasma resistance has been developed, a photoelectric conversion active layer made of an amorphous semiconductor can be formed on the transparent conductive film by a plasma CVD method.
  • the above first structure is widely used at present.
  • a plasma CVD method by glow discharge decomposition of a source gas or a vapor phase growth method by a photo CVD method can be used.
  • a large-area thin film can be formed.
  • An amorphous Si solar cell can be formed at a relatively low temperature of about 100 ° C. to 200 ° C. Therefore, it is possible to use substrates of various materials as the substrate used for forming the amorphous Si solar cell.
  • a frequently used substrate is a glass substrate or a stainless steel substrate.
  • the thickness of the silicon light absorption layer when the conversion efficiency for converting light into electricity is maximized is about 500 nm.
  • the conversion efficiency it is important to increase the amount of light absorption within the thickness of the light absorption layer.
  • a transparent conductive film having irregularities on the surface of a glass substrate or forming a metal film having irregularities on the surface of a stainless steel substrate By forming a transparent conductive film having irregularities on the surface of a glass substrate or forming a metal film having irregularities on the surface of a stainless steel substrate, The optical path length of light is increased.
  • the optical path length in the light absorption layer is increased, and an amorphous Si solar cell is formed on a flat substrate on which no irregularities are formed on the surface of the light absorption layer. Compared with the structure in which the battery is formed, the light utilization efficiency is significantly improved.
  • the thin film solar cell as described above includes a transparent conductive film, a hydrogenated amorphous silicon carbide (a-SiC: H) p layer, and a hydrogenated amorphous silicon (a-Si: H) i layer on a translucent insulating substrate.
  • a hydrogenated amorphous silicon (a-Si: H) n layer, a transparent conductive film, and a back electrode are sequentially formed. Then, as described above, a concavo-convex shape is formed on the surface of the glass substrate, whereby each layer of the transparent conductive film, the photoelectric conversion active layer, and the transparent conductive film laminated on the upper surface of the glass substrate has a concavo-convex structure.
  • Patent Document 2 discloses a technique for retroreflecting light by using the periodic structure of the V-groove and increasing the light utilization efficiency, and that the V-groove apex angle is preferably 50 to 90 degrees. Is disclosed. Further, it is disclosed that the pitch of the period of the V groove is preferably 10 ⁇ m to 20 ⁇ m. Moreover, if the arrangement
  • FIG. 39 a structure in which a back surface member 402 is disposed on the back surface of a solar cell module 400 is known (Patent Document 4).
  • Patent Document 4 a structure in which a back surface member 402 is disposed on the back surface of a solar cell module 400 is known (Patent Document 4).
  • Patent Document 4 a structure in which a back surface member 402 is disposed on the back surface of a solar cell module 400 is known (Patent Document 4).
  • Patent Document 4 a structure in which a back surface member 402 is disposed on the back surface of a solar cell module 400.
  • Patent Document 4 a structure in which a back surface member 402 is disposed on the back surface of a solar cell module 400.
  • FIG. 39 reference numeral 403 denotes a packed layer, and a plurality of solar cells 401 are arranged at a predetermined interval in the packed layer 403.
  • JP 2001-295437 A Japanese Patent Laid-Open No. 4-61285 Japanese Patent Laid-Open No. 11-274533 Japanese Patent Application Laid-Open No. 11-307791
  • the present invention has been made in view of the above-described problems, and a light reuse sheet that can improve the light utilization efficiency by effectively reusing light that has been lost in the past, and this It aims at providing the solar cell module in which the light reuse sheet
  • the width of the solar battery cell, the gap G between the adjacent solar battery cells, the position of the light reuse sheet, the position of the solar battery cell, the solar battery module An object of the present invention is to provide a light reuse sheet having a thickness and an optimum uneven shape, and to provide a solar cell module using the light reuse sheet.
  • an object of the present invention is to provide a sheet for reusing light from a light emitting element such as an LED or an EL element using the light reuse sheet, and a light emitting element using the sheet.
  • the light reuse sheet according to the first aspect of the present invention includes a concavo-convex reflective surface and reflects light incident on the solar cell module in a specific direction so as to enter the solar cell.
  • the reflecting surface is formed so as to satisfy the following expression in order to reflect light emitted from the light emitting element of the light source module and emit it in a specific direction.
  • the lateral dimension of the solar battery cell or light emitting element is represented by Lx
  • the longitudinal dimension of the solar battery cell or light emitting element is represented by Ly
  • the uneven shape direction of the reflective surface and the lateral dimension of the solar battery cell or light emitting element is uneven shape direction of the reflective surface and the lateral dimension of the solar battery cell or light emitting element.
  • the angle formed by the edge of the direction is represented by ⁇
  • the maximum width of the light that is not emitted in the specific direction but is reflected by the light reuse sheet and emitted in the specific direction is represented by A.
  • the lateral or longitudinal width of the solar electron cell or the light emitting element is equivalent to the maximum width A of the light, and the lateral width is the above-described width.
  • the solar cell module of the second aspect of the present invention has a front plate on which light is incident, a filling layer through which light transmitted through the front plate is transmitted, a light receiving surface and a back surface opposite to the light receiving surface, The solar cell fixed by the filling layer and receiving light transmitted from the filling layer from the light receiving surface and converting the light into electricity, and disposed so as to face the back surface of the solar cell, A light reuse sheet having a concavo-convex reflective surface that reflects light transmitted between adjacent solar cells and receives the light by the solar cells, and the light reuse sheet includes The light reuse sheet of the first aspect is used.
  • the light source module has a filling layer that transmits light and has an emission surface, a light emitting surface and a back surface opposite to the light emitting surface, and is fixed by the filling layer to transmit electricity.
  • a light emitting element that emits the light from the light emitting surface and reflects the light on an emission surface of the filling layer, and is disposed so as to face the back surface of the light emitting element.
  • the solar cell module of the fourth aspect of the present invention has a front plate on which light is incident, a filling layer through which light transmitted through the front plate is transmitted, a light receiving surface and a back surface opposite to the light receiving surface, The solar cell fixed by the filling layer and receiving light transmitted from the filling layer from the light receiving surface and converting the light into electricity, and disposed so as to face the back surface of the solar cell, And a light reuse sheet having a concavo-convex reflective surface that reflects light not received by the light receiving surface of the solar battery cell.
  • an interval between the reflection surface of the light reuse sheet and the light receiving surface of the solar cell is represented by C, and the light incident on the light reuse sheet and the light reuse
  • the reflection surface of the light reuse sheet represents the distance between the incident surface of the solar cell module and the reflection surface of the light reuse sheet as H,
  • W the width of the solar battery cell
  • the reflection surface of the light reuse sheet includes: It is preferable to satisfy.
  • the solar cell module of the fifth aspect of the present invention has a front plate on which light is incident, a filling layer through which light transmitted through the front plate is transmitted, a light receiving surface and a back surface opposite to the light receiving surface, The solar cell fixed by the filling layer and receiving light transmitted from the filling layer from the light receiving surface and converting the light into electricity, and disposed so as to face the back surface of the solar cell, A light reuse sheet having a concavo-convex reflective surface that reflects light not received by the light receiving surface of the solar battery cell, When the distance between the reflection surface of the light reuse sheet and the light receiving surface of the solar battery cell is represented by C, the reflection surface satisfies the following expression.
  • the light utilization efficiency can be improved, and the power generation efficiency of the solar cell module can be improved.
  • the light reuse sheet by using the light reuse sheet, light from a light emitting element such as an LED or an EL element is reused, light utilization efficiency is improved, and a light emitting element with high light emission efficiency can be provided.
  • FIG. 1 It is sectional drawing which shows an example of a solar cell module. It is sectional drawing which shows an example of a solar cell module. It is a front view which shows an example of a solar cell module. It is a figure which shows the area of the area
  • the first embodiment relates to a light reuse sheet used for deflecting (reflecting) light in a specific direction and reusing light that has been conventionally lost, and a solar cell module including the same.
  • the solar cell module 200 of the first embodiment includes a front plate 10, a filling layer 11, and a light reuse sheet 12.
  • the front plate 10 is a plate that protects the solar battery cell 1 from impact, dirt, moisture intrusion, etc., and transmits light from the light source S such as sunlight or illumination light, and is made of a transparent material having high light transmittance. It is formed using. Thereby, the light H0 that the light of the light source S enters perpendicularly to the incident surface 200a from the sunlight / illumination light side F enters the front plate 10, passes through the front plate 10, and is emitted to the filling layer 11. .
  • the normal line NG of the incident surface 200a is a direction parallel to the normal line of the plane P when the front plate 10 is placed horizontally on the plane P, and the light H0 incident perpendicularly to the incident surface 200a is It is light incident on the solar cell module 200 in parallel with the normal line NG.
  • the front plate 10 is formed using a glass such as tempered glass or sapphire glass, or a resin sheet such as PC (polycarbonate) or PEN (polyethylene naphthalate). Further, if the front plate 10 is tempered glass, the thickness of the front plate 10 is set to about 3 to 6 mm. If the front plate 10 is a resin sheet, the thickness of the front plate 10 is set to 100 ⁇ m to 3000 ⁇ m.
  • the filling layer 11 into which the light emitted from the front plate 10 is incident is a layer for sealing the solar battery cell 1.
  • the light H0 incident on the front plate 10 passes through the filling layer 11 and becomes light H10 emitted to the solar battery cell 1, and part of the light H0 becomes light H1 emitted to the light reuse sheet 12.
  • the filling layer 11 is formed using a material having a high light transmittance such as flame retardant EVA (ethylene vinyl acetate) in order to transmit the incident light H0.
  • the solar battery cell 1 has a function of converting light incident on the light receiving surface 1a into electricity by photoelectric effect.
  • CdTe compound of Cd / Te
  • CIGS compound of Cu / In / Ga / Se
  • Many types of solar cells are used.
  • a plurality of solar cells 1 are connected by electrodes to form a solar cell module 200. And the light H10 which injected into the photovoltaic cell 1 from the filling layer 11 is converted into electricity by this photovoltaic cell 1.
  • the light incident obliquely with respect to the incident surface 200a is reflected at the incident surface 200a more than the vertically incident light H0, and the light directly incident on the solar battery cell 1 is reduced. As a result, less light is available for power generation. For this reason, when the incident light H0 enters the incident surface 200a substantially perpendicularly, the power generation efficiency becomes the highest.
  • the light reuse sheet 12 of the first embodiment includes a structural layer 13, a reflective layer 14, and a base material 15 as shown in FIGS. 1 and 2.
  • the structure layer 13 has one surface formed in an uneven shape.
  • a thermosetting resin, an ultraviolet curable resin, an electron beam curable resin, or the like is applied or injected into a mold having a surface corresponding to the concavo-convex shape of the reflecting surface 12a. Further, there is a method of disposing the base material 15 thereon and releasing from the stamper after the curing treatment.
  • the light reuse sheet 12 may be composed of the structural layer 13 and the reflective layer 14 without using the base material 15.
  • Examples of a method for producing such a light reuse sheet 12 include a method of forming by a pressing method using a mold, a casting method, an injection molding method, and the like. According to this method, it is possible to form an uneven shape simultaneously with the sheet formation.
  • a mold for forming the reflecting surface 12a As a mold for forming the reflecting surface 12a, a mold manufactured by mechanical cutting can be used. In addition, a duplicated mold based on the above mold can be used. In this case, it is desirable that the concavo-convex tip has a rounded shape in order to prevent the rugged tip from being scratched.
  • the uneven shape of the reflecting surface 12a may have a periodic structure. Further, the uneven shape of the reflecting surface 12a may be a triangular, trapezoidal, polygonal prism shape, various lens / prism shapes such as a cylindrical lens, or a hemispherical shape.
  • the pitch of the period-shaped structure of the reflective surface 12a is desirably 300 ⁇ m or less, and more desirably 200 ⁇ m or less. That is, when the pitch of the structure period is larger than 300 ⁇ m, the moldability is poor because the resin does not sufficiently enter the mold of the concavo-convex tip when the reflecting surface 12a is molded.
  • the pitch of the structure period is 200 ⁇ m or less, it is possible to mold even a resin having a relatively high viscosity.
  • the pitch of the structure period is small, it becomes difficult to produce a mold, so that it is preferably 10 ⁇ m or more, and more preferably 50 ⁇ m or more. That is, when the pitch of the structure period is smaller than 10 ⁇ m, the time for cutting the mold is long and the tact is lowered, resulting in poor production efficiency. If the pitch of the structure period is smaller than 50 ⁇ m, the resin does not enter the concave / convex groove when the reflecting surface 12a is formed, and the shape of the concave / convex tip portion cannot be produced as usual.
  • the thickness of the structural layer 13 is not particularly limited, but is, for example, 30 ⁇ m or more and 500 ⁇ m or less considering the height of the uneven structure.
  • the above-described manufacturing method may be appropriately selected depending on suitability with the following materials.
  • a scattering reflector for example, a curing agent, a plasticizer, a dispersant, various leveling agents, an ultraviolet absorber, an antioxidant, a viscosity modifier, A lubricant, a light stabilizer and the like may be appropriately blended.
  • the polymer composition is not particularly limited.
  • Examples of the polyol that is a raw material of the polyurethane-based resin include a polyol obtained by polymerizing a monomer component containing a hydroxyl group-containing unsaturated monomer, or a polyester polyol obtained under the condition of excess hydroxyl group. Or a mixture of two or more.
  • hydroxyl group-containing unsaturated monomers examples include (a) 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, allyl alcohol, homoallyl alcohol, cinnamon Hydroxyl group-containing unsaturated monomers such as alcohol and crotonyl alcohol, (b) for example ethylene glycol, ethylene oxide, propylene glycol, propylene oxide, butylene glycol, butylene oxide, 1,4-bis (hydroxymethyl) cyclohexane, phenylglycidyl Dihydric alcohols or epoxy compounds such as ether, glycidyl decanoate, Plaxel FM-1 (manufactured by Daicel Chemical Industries, Ltd.) and, for example, acrylic acid, methacrylic acid, maleic acid, fumaric acid, Tonsan, and the like hydroxyl group-containing unsaturated monomers obtained by reaction of an unsaturated carboxylic acid such as itac
  • the polyols described above are ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, tert-butyl acrylate, ethyl hexyl acrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate.
  • the number average molecular weight of the polyol obtained by polymerizing a monomer component containing a hydroxyl group-containing unsaturated monomer is 1,000 or more and 500,000 or less, preferably 5,000 or more and 100,000 or less.
  • the hydroxyl value is 5 or more and 300 or less, preferably 10 or more and 200 or less, and more preferably 20 or more and 150 or less.
  • Polyester polyols obtained under conditions of excess hydroxyl groups include (c) ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl, for example.
  • Glycol hexamethylene glycol, decamethylene glycol, 2,2,4-trimethyl-1,3-pentanediol, trimethylolpropane, hexanetriol, glycerin, pentaerythritol, cyclohexanediol, hydrogenated bisphenol A, bis (hydroxymethyl) Polyhydric alcohols such as cyclohexane, hydroquinone bis (hydroxyethyl ether), tris (hydroxyethyl) isosinurate, xylylene glycol, and (d) for example malee , Fumaric acid, succinic acid, adipic acid, sebacic acid, azelaic acid, trimetic acid, terephthalic acid, phthalic acid, isophthalic acid and other polybasic acids, and propanediol, hexanediol, polyethylene glycol, trimethylolpropane It can be produced by reacting under the condition that the number of hydroxy
  • the number average molecular weight of the polyester polyol obtained under the above hydroxyl group-excess conditions is 500 or more and 300,000 or less, preferably 2000 or more and 100,000 or less.
  • the hydroxyl value is 5 or more and 300 or less, preferably 10 or more and 200 or less, and more preferably 20 or more and 150 or less.
  • the polyol used as the polymer material of the polymer composition is obtained by polymerizing the above-mentioned polyester polyol and the monomer component containing the above-mentioned hydroxyl group-containing unsaturated monomer, and is a (meth) acryl unit or the like
  • An acrylic polyol having If polyester polyol or acrylic polyol is used as the polymer material, the weather resistance is high, and yellowing of the structural layer 3 can be suppressed.
  • any one of this polyester polyol and acrylic polyol may be used, and both may be used.
  • the number of hydroxyl groups in the polyester polyol and acrylic polyol described above is not particularly limited as long as it is 2 or more per molecule.
  • the hydroxyl value in the solid content is 10 or less, the number of crosslinking points decreases, and the physical properties of the film such as solvent resistance, water resistance, heat resistance, and surface hardness tend to decrease.
  • a scattering reflector may be contained in the polymer composition forming the structural layer 13 in order to improve reflection performance and heat resistance performance.
  • a scattering reflector in the polymer composition, the heat resistance of the structural layer 13 or the light reuse sheet 12 can be improved, and if a material having a refractive index significantly different from that of the polymer composition is used, light can be emitted. Can be reflected.
  • the reflective layer (metal reflective layer) 14 may not be provided as shown in FIG. 4 or FIG.
  • the inorganic material constituting the scattering reflector agent is not particularly limited. It is preferable to use an inorganic oxide as the inorganic substance. As the inorganic oxide, silica or the like can be used, and silica hollow particles can also be used. A metal compound such as ZnS can also be used. In this case, a metal oxide such as TiO 2 , ZrO, and Al 2 O 3 is particularly desirable. Of these, TiO 2 is preferable because of its high refractive index and easy dispersibility.
  • the shape of the scattering reflector may be any particle shape such as a spherical shape, a needle shape, a plate shape, a scale shape, and a crushed shape, and is not particularly limited.
  • the lower limit of the average particle diameter of the scattering reflector is preferably 0.1 ⁇ m, and the upper limit is preferably 30 ⁇ m. If the average particle diameter is smaller than 0.1 ⁇ m, light is not sufficiently reflected. Further, if the average particle diameter is larger than 30 ⁇ m, the unevenness caused by the particles appears on the surface, and it is difficult to form a desired uneven shape.
  • the upper limit of the amount of the scattering reflector described above is preferably 100 parts. This is because when the amount of the inorganic filler is less than 30 parts, the light H1 incident on the structural layer 12 from the filler layer 11 cannot be sufficiently reflected. On the contrary, if the blending amount exceeds 100 parts, the moldability is poor.
  • a material having an organic polymer fixed on its surface may be used.
  • the scattering reflector fixed to the organic polymer the dispersibility in the polymer composition or the affinity with the polymer composition can be improved.
  • the organic polymer is not particularly limited with respect to its molecular weight, shape, composition, presence or absence of a functional group, and any organic polymer can be used.
  • arbitrary shapes such as a linear form, a branched form, and a crosslinked structure, are employable.
  • Specific resins constituting the above-mentioned organic polymer include, for example, (meth) acrylic resins, polyolefins such as polystyrene, polyvinyl acetate, polyethylene and polypropylene, polyesters such as polyvinyl chloride, polyvinylidene chloride and polyethylene terephthalate, and these Or a resin partially modified with a functional group such as an amino group, an epoxy group, a hydroxyl group, or a carboxyl group.
  • materials having an organic polymer containing a (meth) acrylic unit such as (meth) acrylic resin, (meth) acrylic-styrene resin, (meth) acrylic-polyester resin, etc., have a film forming ability.
  • the specific resin constituting the organic polymer is preferably a resin having compatibility with the above-described polymer composition, and is most preferably a material having the same composition as the polymer composition.
  • a polyol having a cycloalkyl group is preferable.
  • the polymer composition becomes highly hydrophobic, such as water repellency and water resistance, and the structural layer 13 or the light reuse sheet 12 under high temperature and high humidity conditions.
  • the bending resistance, dimensional stability, etc. are improved.
  • the basic properties of the coating layer such as the weather resistance, hardness, and solvent resistance of the structural layer 13 are improved.
  • the affinity with the scattering reflector having the organic polymer fixed on the surface and the dispersibility of the scattering reflector are further improved.
  • isocyanate as a hardening
  • curing agent in a polymer composition, it becomes a much stronger crosslinked structure and the film physical property of the structure layer 13 improves further.
  • this isocyanate the same substance as the above-mentioned polyfunctional isocyanate compound is used. Of these, aliphatic isocyanates that prevent yellowing of the coating are preferred.
  • the scattering reflector may contain an organic polymer inside. Thereby, moderate softness
  • the organic polymer preferably contains an alkoxy group, and the content thereof is not particularly limited, but is preferably 0.01 mmol or more and 50 mmol or less per 1 g of the scattering reflector.
  • the alkoxy group can improve the affinity with the polymer composition or the dispersibility in the polymer composition.
  • the aforementioned alkoxy group represents an RO group bonded to a metal element that forms a fine particle skeleton.
  • R is an alkyl group which may be substituted, and the RO groups in the fine particles may be the same or different. Specific examples of R include methyl, ethyl, n-propyl, isopropyl, n-butyl and the like.
  • the same metal alkoxy group as the metal constituting the scattering reflector is preferably used. When the scattering reflector is colloidal silica, it is preferable to use an alkoxy group having silicon as a metal.
  • the content of the organic polymer in the scattering reflector to which the organic polymer is fixed is not particularly limited, but is preferably 0.5% by mass or more and 50% by mass or less based on the scattering reflector.
  • the deposition target surface (structural layer) of the reflective layer 14 is improved in order to improve the tight adhesion and the like.
  • 13 surface is preferably subjected to a surface treatment.
  • a surface treatment include (a) corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals, and (b) primer.
  • the coating treatment include undercoat treatment, anchor coat treatment, and vapor deposition anchor coat treatment. Among these surface treatments, a corona discharge treatment and an anchor coat treatment that improve adhesion strength with the reflective layer 14 and contribute to the formation of a dense and uniform reflective layer 14 are preferable.
  • Examples of the anchor coating agent used in the above-described anchor coating treatment include a polyester anchor coating agent, a polyamide anchor coating agent, a polyurethane anchor coating agent, an epoxy anchor coating agent, a phenol anchor coating agent, and a (meth) acrylic anchor.
  • Examples thereof include a coating agent, a polyvinyl acetate anchor coating agent, a polyolefin anchor coating agent such as polyethylene aly polypropylene, and a cellulose anchor coating agent.
  • polyester anchor coating agents that can further improve the adhesive strength of the reflective layer 14 are particularly preferable.
  • the coating amount (in terms of solid content) of the above-described anchor coating agent is preferably 1 g / m 2 or more and 3 g / m 2 or less.
  • the coating amount of the anchor coating agent is less than 1 g / m 2, the effect of improving the adhesion of the reflective layer 14 becomes small.
  • the coating amount of the anchor coating agent is more than 3 g / m 2 , the strength, durability and the like of the light reuse sheet 12 may be reduced.
  • a silane coupling agent used for improving tight adhesion a silane coupling agent used for improving tight adhesion
  • an anti-blocking agent used for preventing blocking an ultraviolet absorber used for improving weather resistance
  • Various additives such as can be mixed as appropriate.
  • the mixing amount of the additive is preferably 0.1% by weight or more and 10% by weight or less from the balance between the effect expression of the additive and the function inhibition of the anchor coat agent. If the above-mentioned additive is less than 0.1% by weight, blocking cannot be sufficiently prevented and sufficient weather resistance cannot be obtained, and if it is more than 10% by weight, the function of the topcoat agent is inhibited.
  • the reflective layer 14 is a layer that reflects light incident on the light reuse sheet 12, and is formed, for example, by vapor-depositing a metal along the surface of the structural layer 13 on which the concavo-convex shape is formed.
  • the vapor deposition apparatus used for forming the reflective layer 14 is not particularly limited as long as a metal can be vapor deposited on the structural layer 13 without causing deterioration such as shrinkage and yellowing.
  • Physical vapor deposition methods Physical Vapor Deposition method: PVD method
  • PVD method Physical Vapor Deposition method
  • ion plating method ion cluster beam method
  • PECVD method Plasma chemical vapor deposition method
  • thermal chemical vapor deposition method thermal chemical vapor deposition method
  • CVD method chemical vapor deposition method
  • a vacuum vapor deposition method or an ion plating method that can form a high-quality reflective layer 4 with high productivity is preferable.
  • the metal used for the reflective layer 14 is not particularly limited as long as it has a metallic luster and can be deposited.
  • Examples of the metal used for the reflective layer 14 include aluminum, silver, gold, nickel, tin, and zirconium. Among these, aluminum is preferable because it is highly reflective and the dense reflective layer 14 can be formed relatively easily.
  • the reflective layer 14 may have a single layer structure or a multilayer structure of two or more layers.
  • the deterioration of the structural layer 13 is reduced by reducing the thermal burden applied during vapor deposition, and the adhesion between the structural layer 13 and the reflective layer 14 is further improved. Can do.
  • a metal oxide layer may be provided on the metal film.
  • the vapor deposition conditions in the above-mentioned physical vapor deposition method and chemical vapor deposition method are appropriately designed according to the resin type of the structural layer 13 or the substrate 15, the thickness of the reflective layer 14, and the like.
  • the lower limit of the thickness of the reflective layer 14 is preferably 10 nm, and particularly preferably 20 nm.
  • the upper limit of the thickness of the reflective layer 14 is preferably 200 nm, and particularly preferably 100 nm. If the thickness of the reflective layer 14 is smaller than the lower limit of 10 nm, the light incident on the reflective layer 14 from the filling layer 11 cannot be sufficiently reflected. Even if the thickness is 20 nm or more, the light reflected by the reflective layer 14 does not increase. On the other hand, when the thickness of the reflective layer 14 exceeds the upper limit of 200 nm, a crack that can be visually confirmed occurs in the reflective layer 14.
  • the outer surface of the reflective layer 14 may be subjected to a top coat treatment.
  • a top coat treatment By performing the top coat process on the outer surface of the reflective layer 14 in this way, the reflective layer 14 is sealed and protected, and as a result, the handling property of the light reuse sheet 12 is improved. In addition, aged deterioration of the reflective layer 14 can be suppressed.
  • topcoat agent used in the above-described topcoat treatment examples include a polyester topcoat agent, a polyamide topcoat agent, a polyurethane topcoat agent, an epoxy topcoat agent, a phenol topcoat agent, and a (meth) acrylic top.
  • examples thereof include a coating agent, a polyvinyl acetate top coating agent, a polyolefin top coating agent such as polyethylene aly polypropylene, and a cellulose top coating agent.
  • a polyester-based topcoat agent that has high adhesive strength with the reflective layer 14 and contributes to surface protection of the reflective layer 14, sealing of defects, and the like is particularly preferable.
  • the coating amount (in terms of solid content) of the above-mentioned topcoat agent is preferably 3 g / m 2 or more and 7 g / m 2 or less. If the coating amount of the topcoat agent is less than 3 g / m 2 , the effect of sealing and protecting the reflective layer 14 may be reduced. On the other hand, even if the coating amount of the top coat agent exceeds 7 g / m 2 above, the sealing and protecting effect of the reflective layer 14 does not increase so much, and the thickness of the light reuse sheet 12 increases. .
  • a silane coupling agent used for improving tight adhesion a silane coupling agent used for improving tight adhesion
  • an ultraviolet absorber used for improving weather resistance an inorganic used for improving heat resistance
  • Various additives such as a filler can be appropriately mixed.
  • the mixing amount of the additive is preferably 0.1% by weight or more and 10% by weight or less in view of the balance between the effect expression of the additive and the function inhibition of the topcoat agent. If the above-mentioned additive is less than 0.1% by weight, close adhesion, weather resistance and heat resistance cannot be sufficiently obtained, and if it is more than 10% by weight, the function of the topcoat agent is inhibited.
  • the base material 15 constituting the light reuse sheet 12 is formed by sheet molding using a synthetic resin as a material.
  • a synthetic resin used for the substrate 15, a material having weather resistance such as water resistance and durability against ultraviolet rays is desirable in view of being installed outdoors.
  • polyethylene resins such as polyethylene terephthalate resin (PET resin), polypropylene resins, methacrylic resins, polymethylpentene resins, cyclic polyolefin resins, polystyrene resins, acrylonitrile- (poly) styrene copolymers (AS resins) , Acrylonitrile-butadiene-styrene copolymer (ABS resin), polyvinyl chloride resin, fluorine resin, poly (meth) acrylic resin, polycarbonate resin, polyester resin, polyamide resin, polyimide resin, polyamideimide Resin, polyaryl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyether
  • polyimide resins, polycarbonate resins, polyester resins, fluorine resins, polylactic acid resins are resins having high heat resistance, strength, weather resistance, durability, gas barrier properties against water vapor and the like. preferable.
  • polyester resin examples include polyethylene terephthalate and polyethylene naphthalate.
  • polyester-based resins polyethylene terephthalate is particularly preferable because it has a good balance between various functions such as heat resistance and weather resistance, and price.
  • fluororesin examples include polytetrafluoroethylene (PTFE), perfluoroalkoxy resin (PFA) made of a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, and a copolymer of tetrafluoroethylene and hexafluoropropylene (FEP).
  • PTFE polytetrafluoroethylene
  • PFA perfluoroalkoxy resin
  • FEP hexafluoropropylene
  • cyclic polyolefin resin examples include polymerization of cyclic dienes such as a) cyclopentadiene (and derivatives thereof), dicyclopentadiene (and derivatives thereof), cyclohexadiene (and derivatives thereof), norbornadiene (and derivatives thereof), and the like. And b) a copolymer obtained by copolymerizing a cyclic diene and one or more olefinic monomers such as ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, and isoprene. It is done.
  • cyclic dienes such as a) cyclopentadiene (and derivatives thereof), dicyclopentadiene (and derivatives thereof), cyclohexadiene (and derivatives thereof), norbornadiene (and derivatives thereof), and the like.
  • cyclopentadiene (and derivatives thereof), dicyclopentadiene (and derivatives thereof) or norbornadiene (and derivatives thereof) such as polymers having excellent strength, heat resistance, and weather resistance are particularly preferred. preferable.
  • the above-mentioned synthetic resin can be used 1 type or in mixture of 2 or more types.
  • various additives and the like can be mixed in the forming material of the base material 15 for the purpose of improving and modifying processability, heat resistance, weather resistance, mechanical properties, dimensional stability, and the like.
  • the additive include a lubricant, a crosslinking agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a filler, a reinforcing fiber, a reinforcing agent, an antistatic agent, a flame retardant, a flame retardant, a foaming agent, and an antifungal agent.
  • the method for forming the substrate 15 is not particularly limited, and known methods such as an extrusion method, a cast forming method, a T-die method, a cutting method, and an inflation method are employed.
  • the base material 15 when using the base material 15, it is preferable to make the thickness into 25 micrometers or more and 500 micrometers or less, and it is especially preferable to set it as 250 micrometers or less. If the thickness of the base material 15 is less than 25 ⁇ m, curling occurs during the coating process of the structural layer 13 due to the effect of curing shrinkage of an ultraviolet curable resin or the like, and problems occur when it is incorporated into the solar cell module 200. Conversely, if the thickness of the base material 15 exceeds 500 ⁇ m, the film weight increases and the weight of the solar cell module 200 also increases. If it is 250 micrometers or less, the lighter-weight solar cell module 200 is realizable.
  • the base material 15 or the structural layer 13 may contain an ultraviolet stabilizer or a polymer in which an ultraviolet stabilizing group is bonded to a molecular chain.
  • an ultraviolet stabilizer or ultraviolet stabilizer radicals generated by ultraviolet rays, active oxygen and the like are inactivated, and the ultraviolet stability and weather resistance of the light reuse sheet 12 can be improved.
  • a hindered amine ultraviolet stabilizer or a hindered amine ultraviolet stabilizer having high stability against ultraviolet rays is preferably used.
  • seat 12 which consists of the said structure, as shown in FIG. 1, the light which permeate
  • the reflected light H2 is reflected again at the interface such as between the front plate 10 and the atmosphere, and is photoelectrically converted into light H3 incident on the light receiving surface 1a of the solar battery cell 1.
  • the solar cell module 200 of 1st Embodiment is permeate
  • the traveling direction of the reflected light H2 can be controlled by the uneven structure of the reflecting surface 12a, and a lot of light can be incident on the light receiving surface 1a.
  • the concavo-convex structure of the reflecting surface 12a will be described using the normal line N0.
  • the normal line N0 of the reflective surface 12a is a straight line orthogonal to the tangent plane at an arbitrary point on the reflective surface 12a, as shown in FIG.
  • the angle ⁇ of the reflection surface 12a is an intersection angle between the normal line N0 of the reflection surface 12a and the sheet normal line NB.
  • the sheet normal line NB is arranged so as to be parallel to the normal line NG of the incident surface 200a, and therefore the incident light H1 is incident in parallel to the sheet normal line NB.
  • the reflectance of the reflected light H2 varies greatly depending on the incident angle on the incident surface 200a. Further, it is known that the reflectance changes greatly with the critical angle ⁇ c as a boundary.
  • the critical angle ⁇ c is expressed by Equation (1), where ng is the refractive index of the front plate 10, and the light H2 incident on the incident surface 200a at an angle equal to or larger than the critical angle ⁇ c is totally incident on the incident surface 200a. Reflected.
  • seat 12 has the function to reflect the light H1 which injected between the photovoltaic cells 1 (interval G) with the reflective surface 12a. For this reason, the reflected light H2 is reflected again at the interface between the front plate 10 and the atmosphere, and becomes photoelectrically converted into light H3 incident on the light receiving surface 1a of the solar battery cell 1. Thereby, the effect that light utilization efficiency improves compared with the structure without the light reuse sheet
  • the effect of the light reuse sheet 12 is exhibited only when the relationship between the dimensions / arrangement of the solar cells 1 and the light reuse sheet 12 and the angle ⁇ between the incident light H1 and the emitted light H2 is within an appropriate range. Is done.
  • the solar cell module 200 has a two-dimensional array of solar cells 1. For this reason, it is possible to install the light reuse sheet 12 in a vertical direction, a horizontal direction, or an oblique direction. The effect can be enhanced by installing the light reuse sheet 12 at an optimum angle while considering the relationship between the vertical and horizontal intervals.
  • the region A where the reflected light H2 is incident on the light receiving surface 1a and the vertical and horizontal dimensions Lx and Ly of the solar battery cell 1 will be described separately.
  • 8A to 13 illustrate the dimensions / arrangement and the relationship between the angle ⁇ formed by the incident light H1 and the emitted light H2, and therefore the uneven shape of the reflecting surface 12a of the light reuse sheet 12 is not illustrated. There is.
  • FIG. 8A shows the gap G between the solar cells 1 installed in the vertical direction (y direction shown in the figure), and matches the concave / convex shape direction of the light reuse sheet 12 with the long gap between the solar cells 1. (X direction shown in the figure).
  • FIG. 8B shows the PP ′ cross-sectional structure of FIG. 8A. Part of the light incident from the front of the solar cell 1 (+ z direction) is incident on the light reuse sheet 12, reflected in the y direction (in the plane for determining PP 'and z), and then reflected again by the front plate 10. Then, it reaches the solar cell 1.
  • FIG. 9A shows the gap G between the solar cells 1 installed in the vertical direction (y direction shown in the figure), and the uneven shape direction of the light reuse sheet 12 is the long interval between the solar cells 1. It is installed at a rotation angle ⁇ (an angle formed by the concave-convex shape direction of the reflecting surface 12a and the lateral edge of the solar battery cell 1) without matching (an angle from the x direction shown in the figure).
  • FIG. 9B shows the QQ ′ cross-sectional structure of FIG. 9A.
  • the line QQ ′ is perpendicular (90 degrees) to the rotation angle ⁇ of the reuse sheet 20.
  • G ′ is larger than the gap G between the solar cells 1.
  • FIG. 8B and FIG. 9B are compared, the space
  • the solar cell 1 since the solar cell 1 has horizontal and vertical dimensions, the light reflected by the light reuse sheet 12 may not be allowed to enter the solar cell 1 again. For this reason, below, the optimal ratio is calculated
  • FIG. 10 shows an example in which the gap G between the solar cells 1 is sufficiently wide so that the efficiency of the light reuse sheet 12 is maximized. That is, it arrange
  • the reflected light H2 is incident on the region A where the reflected light H2 is incident on the light receiving surface 1a of the solar cell 1, and the light receiving surface 1a of the solar cell 1 on the solar cell 1 side where the reflected light H2 is incident.
  • the reflected light H2 of the light H11 incident on the boundary with the region B not to be incident enters between the end WN of the light receiving surface 1a on the incident light H11 side and the end WF of the light receiving surface 1a on the incident light H11 side.
  • the reflected light H2 of H12 incident on the boundary of the region B where the reflected light H2 is not incident on the light receiving surface 1a of the solar cell 1 on the opposite side of the solar cell 1 on which the reflected light H2 is incident is incident on the light receiving surface 1a. Incident to the end WN on the light H11 side.
  • FIG. 11 shows the state of the rotation angle ⁇ of the light reuse sheet 12 by obtaining the gap G between the solar cells 1 under the conditions of the equations (8) and (9). At this time, the rotation angle ⁇ satisfies the condition of Expression (7). Furthermore, the photovoltaic cell 1 has a dimension Lx in the horizontal direction (x direction) and a dimension Ly in the vertical direction (y direction). As shown in FIG. 10, in FIG. 11, a region where light can be reused in the solar battery cell 1 is indicated by a symbol A. The distance A is a distance with the side surface of the solar battery cell 1 as a base point. As shown in FIG. 11, the distance A is a distance in the vertical direction from the rotation angle ⁇ of the light reuse sheet 12.
  • Tx the reuse area of the light incident on the light receiving surface 1a from the vertical side surface 1e of the solar cell 1
  • the reuse area of the light incident on the light receiving surface 1a from the lateral side surface 1c of the solar battery cell 1 is Ty. It is said.
  • Tx and Ty are expressed by Expression (10) and Expression (11).
  • the equation (14) obtained from the equation (13) may be used.
  • FIG. 12 shows the region f calculated from the equation (13).
  • Expressions (7), (8), and (9) are used.
  • the area (LxxLy) of the solar cell is fixed, in order to compare the influence of the shape of the solar battery cell 1 (influence of the square and the rectangle), the result of changing Ly / Lx is shown. .
  • the maximum value of the region f is obtained when the rotation angle ⁇ is 45 degrees.
  • the region f becomes smaller.
  • the rotation angle ⁇ is greater than 45 degrees, the region f decreases, and when the rotation angle ⁇ is 90 degrees, the region f becomes the minimum value.
  • the rotation angle ⁇ is 90 degrees and 0 degrees, the same numerical value in the region f is obtained. This result is also obtained from equation (14).
  • the square solar battery cell 1 is represented by Expression (15).
  • the rotation angle ⁇ at which the region f becomes the maximum value is examined.
  • a condition that the vertical dimension Ly is longer than the horizontal dimension Lx of the solar battery cell 1 is set, and Ly / Lx is plotted from 2 to 5 in FIG. From this figure, it is not 45 degrees that the region f has the maximum value.
  • the optimum rotation angle approaches 90 degrees as the ratio of Ly / Lx increases.
  • the maximum area f gradually increases as the ratio of Ly / Lx increases. That is, in order to obtain the maximum reuse light, it was confirmed that the solar cell 1 is preferably rectangular rather than square, and that the longer side is preferably longer than the shorter side.
  • Equation (19) is obtained from the angle ⁇ formed by H2.
  • FIG. 13 and FIG. 14 show the above Amax for three types of general solar battery cells 1 (size width 156 mm (Case 1), 78 mm (Case 2), and 39 mm (Case 3) of the square solar battery cell 1)). It is the figure which compared the optimal rotation angle (phi) and the reuse area
  • the optimum rotation angle ⁇ changes from 45 degrees to 90 degrees. Moreover, when the photovoltaic cell 1 is small, the change is quick. For example, when Ly / Lx is 3, the optimum rotation angle ⁇ is 75 degrees, 78 degrees, and 85 degrees for Case1, Case2, and Case3, respectively.
  • FIG. 15 shows a case where the condition of Expression (9) is disturbed by the rotation angle ⁇ of the light reuse sheet 12.
  • the region f increases as the rotation angle ⁇ increases from 0 degrees.
  • the rotation angle ⁇ satisfies the condition of Expression (20)
  • the region f does not change and becomes constant. That is, the condition of Expression (20) is a condition that is not affected by the rotation angle ⁇ , and this can be confirmed with reference to FIG.
  • the region f calculated including the condition of Expression (20) is shown.
  • the area (Lx ⁇ Ly) of the solar battery is fixed, and the influence when the shape of the solar battery cell 1 is changed from a square to a rectangle is shown.
  • Ly / Lx is changed from 1 to 4
  • Expressions (7), (8), and (9) are satisfied, and are the same as in FIG.
  • Ly / Lx is 5
  • a region (Equation (20)) in which all rotation angle regions (Equations (7) and (9)) are disturbed appears.
  • the reuse area f becomes the maximum value, and f does not change even if the rotation angle ⁇ is changed.
  • the rotation angle ⁇ in this area is about 65 degrees to 90 degrees.
  • seat 12 which has such a structure, the light which injects into the area
  • a structure having a barrier layer 16 made of an aluminum layer of 10 ⁇ m to 30 ⁇ m or a silica layer of 10 nm to 100 nm can be used for the light reuse sheet 12.
  • PVF polyvinyl fluoride resin
  • a film having a polyvinyl fluoride resin may be bonded to protect the solar cell module 200. By doing in this way, it can be used also as a back seat
  • Example 1 In Example 1, a 250 ⁇ m PET film was used as the substrate 15. As a structural layer 13, a layer formed of a triangular prism-like concavo-convex structure having a pitch of 150 ⁇ m made of UV-curing acrylic resin and having a reflective surface with an apex angle of 135 degrees is laminated on a PET film, and the metallic reflective layer 14 is 100 nm.
  • seat 12 was obtained by forming the aluminum layer of this by vapor deposition. A solar cell module 200 was produced using the light reuse sheet 12 produced in this manner.
  • the filled layer 11 was formed.
  • a polycrystalline silicon solar cell having a 150 mm square and a thickness of 0.2 mm is used as the solar cell 1.
  • the solar cell 1 has a width of about 25 mm at the periphery of the solar cell 1 at a position 0.5 mm from the light receiving surface 1 a of the solar cell 1.
  • the above-mentioned light reuse sheet 12 was disposed. At this time, the light reuse sheet 12 was installed so that the triangular prism-shaped uneven direction was parallel to the end of the solar battery cell 1. And the result of having measured the power generation efficiency of the solar cell module 200 of this Example 1 is shown in Table 1.
  • Example 2 Next, in Example 2, a 250 ⁇ m PET film was used as the substrate 15.
  • the structural layer 13 a layer formed of a triangular prism-like concavo-convex structure having a pitch of 200 ⁇ m and an apex angle of 120 ° made of an ultraviolet curable acrylic resin is laminated on a PET film, and the metallic reflective layer 14 is 100 nm.
  • seat 12 was obtained by forming the aluminum layer of this by vapor deposition. A solar cell module 200 was produced using the light reuse sheet 12 produced in this manner.
  • the filled layer 11 was formed.
  • a polycrystalline silicon solar cell having a 150 mm square and a thickness of 0.2 mm is used as the solar cell 1.
  • the solar cell 1 has a width of about 25 mm at the periphery of the solar cell 1 at a position 0.5 mm from the light receiving surface 1 a of the solar cell 1.
  • the above-mentioned light reuse sheet 12 was disposed. At this time, the light reuse sheet 12 was installed so that the triangular prism-shaped uneven direction was parallel to the end of the solar battery cell 1. And the result of having measured the power generation efficiency of the solar cell module 200 of this Example 2 is also shown in Table 1.
  • Example 3 Next, in Example 3, a 250 ⁇ m PET film was used as the substrate 15.
  • a layer formed of a triangular prism-like concavo-convex structure having a pitch of 150 ⁇ m made of UV-curing acrylic resin and having a reflective surface with an apex angle of 135 degrees is laminated on a PET film, and the metallic reflective layer 14 is 100 nm.
  • seat 12 was obtained by forming the aluminum layer of this by vapor deposition.
  • a solar cell module 200 was produced using the light reuse sheet 12 produced in this manner.
  • the filled layer 11 was formed.
  • a polycrystalline silicon solar cell having a 150 mm square and a thickness of 0.2 mm is used as the solar cell 1.
  • the solar cell 1 has a width of about 25 mm at the periphery of the solar cell 1 at a position 0.5 mm from the light receiving surface 1 a of the solar cell 1.
  • the above-mentioned light reuse sheet 12 was disposed.
  • the light reuse sheet 12 was installed so that the concave and convex direction of the triangular prism was 45 degrees oblique to the end of the solar battery cell 1. And the result of having measured the power generation efficiency of the solar cell module 200 of this Example 3 is also shown in Table 1.
  • Example 4 Next, in Example 4, a 250 ⁇ m PET film was used as the substrate 15.
  • a layer formed of a triangular prism-like concavo-convex structure having a pitch of 200 ⁇ m and an apex angle of 120 ° made of an ultraviolet curable acrylic resin is laminated on a PET film, and the metallic reflective layer 14 is 100 nm.
  • seat 12 was obtained by forming the aluminum layer of this by vapor deposition.
  • a solar cell module 200 was produced using the light reuse sheet 12 produced in this manner.
  • the filled layer 11 was formed.
  • a polycrystalline silicon solar cell having a 150 mm square and a thickness of 0.2 mm is used as the solar cell 1.
  • the solar cell 1 has a width of about 25 mm at the periphery of the solar cell 1 at a position 0.5 mm from the light receiving surface 1 a of the solar cell 1.
  • the above-mentioned light reuse sheet 12 was disposed.
  • the light reuse sheet was installed so that the concave and convex direction of the triangular prism was 45 degrees oblique to the end of the solar battery cell 1. And the result of having measured the power generation efficiency of the solar cell module 200 of this Example 3 is also shown in Table 1.
  • Comparative Example 1 a 250 ⁇ m PET film was used as the substrate 15.
  • the structural layer 13 was not formed, and a 100 nm aluminum layer was formed as the metal reflective layer 14 by vapor deposition to obtain a light reuse sheet.
  • a solar cell module was produced using the light reuse sheet thus produced.
  • a polycrystalline silicon solar cell having a 150 mm square and a thickness of 0.2 mm is used as the solar cell 1.
  • the solar cell 1 has a width of about 25 mm at the periphery of the solar cell 1 at a position 0.5 mm from the light receiving surface 1 a of the solar cell 1.
  • the above-mentioned light reuse sheet was arranged. And the result of having measured the power generation efficiency of the solar cell module of this comparative example 1 is also shown in Table 1.
  • Example 1 As shown in Table 1, when the power generation efficiency of Comparative Example 1 is 100.0%, 110.9% in Example 1, 112.7% in Example 2, and 113.3% in Example 3. 0% and 114.5% in Example 4, which demonstrates that compared with Comparative Example 1, the power generation efficiency is increased in all cases of Examples 1 to 4 provided with the light reuse sheet 12 according to the present invention. It was done.
  • the light reuse sheet 12 does not have to be limited to the application to the solar cell module 200, and can reuse light from light emitting elements such as LEDs or EL as shown in FIG. Is available.
  • FIG. 19 is a cross-sectional view of a uniform state of the light source module 300 according to the present invention.
  • the light source module 300 includes the filling layer 11, the light emitting element 50, and the light reuse sheet 12.
  • the light emitting element 50 has a function of converting electricity into light by electroluminescence, and emits light from the light emitting surface 50a.
  • the light emitting element 50 is preferably a solid light emitting diode such as an LED, an organic EL, or an inorganic EL.
  • the filling layer 11 is a layer that seals the light emitting element 50. Lights M1 and M2 emitted from the light emitting element 50 are transmitted through the filling layer 11, part of which is light M1 emitted from the emission surface 300a, and the other is light M2 reflected from the emission surface 30a.
  • a material having a high light transmittance is used to transmit light incident on the filling layer 11, and an acrylic resin having a high transmittance is preferably used.
  • a part of the light M ⁇ b> 2 is reflected by the emission surface 300 a and enters the reflection surface 12 a of the light reuse sheet 12.
  • the light M3 incident on the reflecting surface 12a is reflected by the reflecting surface 12a in a specific direction, enters the exit surface 300a again, and becomes light M4 that exits from the exit surface 300a.
  • the effect of the light reuse sheet 12 described above is that the dimensions and arrangement of the light emitting element 50 and the light reuse sheet 12 and the relationship between the reflected light M4 and the angle ⁇ formed by the light M3 incident on the reflective surface 12a are within an appropriate range.
  • This relationship is exhibited only in certain cases, and this relationship preferably satisfies the formula (1), more preferably satisfies the formula (2) and the formula (3), and more preferably satisfies the formula (4). Furthermore, it is more preferable to satisfy
  • FIG. 20 is a cross-sectional view showing one embodiment of the solar cell module 400 of the present invention.
  • the solar cell module 400 according to the present invention includes the front plate 22, the filling layer 21, and the light reuse sheet 20.
  • the front plate 22 is a plate that protects the solar cells 30 from impact, dirt, moisture intrusion, etc., and transmits light from the light source S such as sunlight or illumination light, and is made of a transparent material having high light transmittance. Become. The light H0 that the light from the light source S is incident on the incident surface 110 from the sunlight / illumination light side F is incident on the front plate 22, then passes through the front plate 22 and is emitted to the filling layer 21.
  • the normal line NG of the incident surface 110 is a direction parallel to the normal line of the plane P when the front plate 22 is placed horizontally on the plane P.
  • the light incident perpendicularly to the incident surface 110 is light incident on the solar cell module 400 in parallel with the normal line NG.
  • the material of the front plate 22 is glass such as tempered glass or sapphire glass, or a resin sheet such as PC (polycarbonate) or PEN (polyethylene naphthalate). Further, if the front plate 22 is tempered glass, the thickness of the front plate 22 is set to about 3 to 6 mm. If the front plate 22 is a resin sheet, the thickness of the front plate 22 is set to 100 ⁇ m to 3000 ⁇ m.
  • the light emitted from the front plate 22 enters the filling layer 21.
  • the filling layer 21 is a layer that seals the solar battery cell 30.
  • the light H0 incident on the front plate 22 is transmitted through the filling layer 21 and becomes light H10 emitted to the solar battery cell 30, and part of the light H0 is emitted light H1 emitted to the light reuse sheet 20.
  • a material having a high light transmittance is used to transmit the light H0 incident on the filling layer 21, and flame retardant EVA (ethylene vinyl acetate) is widely used.
  • the solar battery cell 30 has a function of converting light incident on the light receiving surface J into electricity by photoelectric effect.
  • CdTe compound of Cd / Te
  • CIGS compound of Cu / In / Ga / Se
  • Many types of solar cells are used.
  • the solar cells 30 are used by connecting a plurality of solar cells 30 with electrodes to form a module.
  • the light H ⁇ b> 10 that has entered the solar battery cell 30 from the filling layer 21 is converted into electricity by the solar battery cell 30.
  • the light reuse sheet 20 has a function of reflecting the light transmitted through the solar battery cell 30 itself or the light H ⁇ b> 1 incident between the solar battery cells 30 with the reflection surface 100.
  • the reflected light H2 is reflected again at the interface such as between the front plate 22 and the atmosphere, and becomes photoelectrically converted into light H3 incident on the light receiving surface J of the solar battery cell 30.
  • the traveling direction of the reflected light H2 can be controlled by the uneven structure of the reflecting surface 100 of the present invention, and a lot of light can be incident on the light receiving surface J.
  • the uneven structure of the reflective surface 100 will be described using the normal line N0.
  • the normal line N0 of the reflecting surface 100 is an arbitrary point on the reflecting surface 100 and is a straight line perpendicular to the tangent plane at that point. This is a direction parallel to the normal N of the plane P when the light reuse sheet 20 is placed on the plane P in a stable state. Further, the angle ⁇ of the reflecting surface 100 is an angle formed by the normal line N0 of the reflecting surface 100 and the sheet normal line NB.
  • the incident light H1 is incident in parallel to the sheet normal NB.
  • the reflectance of the reflected light H2 varies greatly depending on the incident angle to the incident surface 110.
  • FIG. 21 shows a change in reflectance according to the incident angle.
  • This critical angle ⁇ c is given by ng as the refractive index of the front plate 22.
  • Light H2 incident on the incident surface 110 at an angle equal to or greater than the critical angle ⁇ c is totally reflected by the incident surface 110.
  • the refractive index of the filling layer 21 is ne and the angle of the reflected light H2 with respect to the normal line NG is ⁇ 2
  • Equation 21 and Equation 22 It becomes.
  • the refractive index of the material on the reflecting surface is n0, It becomes.
  • This ⁇ 2 is when the angle of the reflecting surface 100 is ⁇ , It becomes. From the above, the angle ⁇ of the reflecting surface 100 In this case, the reflected light H2 is totally reflected on the front plate.
  • the light reuse sheet 20 has a function of reflecting the light H ⁇ b> 1 incident between the solar cells 30 by the reflection surface 100.
  • the reflected light H2 is reflected again at the interface between the front plate 22 and the atmosphere, and becomes light H3 incident on the light receiving surface J of the solar battery cell 30 and is photoelectrically converted.
  • seat 20 there exists an effect which light utilization efficiency improves.
  • the above-described effect is obtained only when the relationship between the dimensions and arrangement of the solar battery cell 30 and the light reuse sheet 20 and the angle ⁇ formed by the incident light H1 and the emitted light H2 is within an appropriate range. There is an effect.
  • the gap G between the solar battery cells 30, the incident surface 110 of the solar battery module 400, and the reflection surface 100 of the light reuse sheet 20 Description will be made separately for each case shown in FIGS. 23 to 28 using the interval H and the width W of the solar battery cell.
  • 23 to 28 illustrate the dimensions / arrangement and the relationship between the angle ⁇ formed by the incident light H1 and the emitted light H2, and thus the uneven shape of the reflecting surface 100 of the light reuse sheet 20 is not illustrated.
  • the light H2 reflected by the gap G between the solar cells 30 does not enter the incident surface 110 again, and therefore the light H2 reflected by the light reuse sheet 20 does not enter the light receiving surface J.
  • This conditional expression is It becomes.
  • the length L of the region B where the reflected light H2 is not incident on the light receiving surface J of the solar cell 30 is: It becomes.
  • the light incident on the region B does not enter the light receiving surface J, it is not used and is lost. Therefore, if L is large, the loss is large, and conversely, if L is small, the loss is small.
  • a part of the light H2 reflected by the gap G between the solar cells 30 is incident on the incident surface 110, but is not incident on the light receiving surface J of the solar cell 30, and is again reused as it is. 20
  • the length L of the region B is equal to G as in the case of FIG.
  • FIG. 25 is a case where the width W of the solar battery cell in the case of FIG. 24 is long.
  • the gap G between the solar cells 30 is such that the light H2 reflected by the reflecting surface 100 is incident on the light receiving surface J of the solar cell 30 and the light H2 reflected by the reflecting surface 100 is reflected by the solar cell 30. It is divided into a region B of light that does not enter the light receiving surface J.
  • the light H11 incident on the boundary between the region A and the region B is incident on the end WF of the solar battery cell 30 on the side opposite to the side on which the light H11 is incident. This conditional expression is and, It is.
  • the length L of the region B is It is preferable because the light H1 incident on the gap G between the solar battery cells 30 is used.
  • the light H11 incident on the boundary is incident on the end WF of the light receiving surface J of the solar battery cell opposite to the light H11 side of the solar battery cell 30.
  • Region A where the reflected light H2 is incident on the light receiving surface J of the solar cell 30 and region B where the reflected light H2 is not incident on the light receiving surface J of the solar cell 30 opposite to the solar cell 30 where the reflected light H2 is incident The light H12 incident on the boundary is incident on the end WN of the light receiving surface J of the solar battery cell on the light H12 side.
  • the width of A is the same length as the width of W. This conditional expression is and, It is.
  • the length L of the region B is It is preferable because the light H1 incident on the gap G between the solar battery cells 30 is used.
  • the reflected light H2 does not enter the region A where the reflected light H2 enters the light receiving surface J of the solar battery cell 30 and the light receiving surface J of the solar battery cell 30 on the solar cell 30 side where the reflected light H2 enters.
  • the reflected light H2 of the light H11 incident on the boundary with the region B is incident between the end WN of the light receiving surface J on the incident light H11 side and the end WF of the light receiving surface J on the incident light H11 side.
  • the reflected light H2 of H12 incident on the boundary of the region B where the reflected light H2 is not incident on the light receiving surface J of the solar battery cell 30 on the opposite side of the solar battery cell 30 on which the reflected light H2 is incident is the incident light H11 on the light receiving surface J. Incident on the side end WN.
  • This conditional expression is and, It is.
  • the length L of the region B is It is preferable because the light H1 incident on the gap G between the solar battery cells 30 is used.
  • FIG. 30 shows an example of the relationship between the gap G between the solar battery cells 30 and the length L of the region B that causes loss.
  • the angle ⁇ formed by the incident light H1 and the reflected light H2 is 0, 42, 46, 50, 54, 58, 62, 66, and 70 degrees
  • H is 5 mm
  • C is 2 mm
  • W is 30 mm.
  • FIG. 6 is a diagram when the gap G between the solar battery cells 30 is 1 mm to 20 mm.
  • the relationship between the length L of the loss region B in the gap G between the solar cells 30 and the gap G between the solar cells 30 can be classified into three.
  • the first is a case where the gap G between the solar cells 30 is small, and the length L of the loss region B in the gap G between the solar cells 30 is the same as the gap G between the solar cells 30. Since the light H1 incident on the gap G between the solar cells 30 is not used, it is not preferable.
  • the second is a case where the gap G between the solar cells 30 is large, and the length L of the loss region B in the gap G between the solar cells 30 increases the gap G between the solar cells 30. Although it becomes long with it, since the light H1 which injects into the clearance gap G between the photovoltaic cells 30 is utilized, it is preferable.
  • the third is an intermediate case between the first and second, and even if the gap G between the solar cells 30 is increased, the length of the region B that is a loss in the gap G between the solar cells 30. L is most preferable because it does not change and loss does not increase.
  • the length L of the loss region B in the gap G between the solar cells 30 varies depending on the angle ⁇ between the incident light H1 and the reflected light H2. .
  • the angle ⁇ formed by the incident light H1 and the reflected light H2 increases, the length L of the loss region B in the gap G between the solar cells 30 also increases.
  • the angle ⁇ formed by the incident light H1 and the reflected light H2 when the length L of the loss region B is the shortest is 54 degrees in this case. .
  • the angle ⁇ formed by the incident light H1 and the reflected light H2 is best at 54 degrees.
  • FIG. 31 shows a schematic diagram of a solar cell module 400 having a plurality of layers between the reflecting surface 100 and the incident surface 110. Even in the case of such a plurality of layers, since the difference in refractive index between the respective layers is small, the solar cell module 400 with high power generation efficiency can be obtained even when the solar cell module is manufactured under the above-described conditions.
  • the light reuse sheet 20 used in the above-described solar cell module 400 includes a structural layer 3, a reflective layer 4, and a base material 2 as shown in FIG.
  • thermosetting resin As a method for forming the concavo-convex shape on the structure layer 3, a thermosetting resin, an ultraviolet curable resin, an electron beam curable resin, or the like is applied or injected onto the surface of the mold on which the concavo-convex shape of the reflective surface 100 is formed, There is a method of disposing the base material 2 on the substrate and releasing it from the stamper after the curing treatment.
  • the light reuse sheet 20 made of only the structural layer 3 without using the base material 2 may be produced by a pressing method, casting method, injection molding method, or the like using a mold. And a method of integrally molding with. According to the method described above, it is possible to form an uneven shape simultaneously with the sheet formation.
  • a mold for forming the reflective surface 100 As a mold for forming the reflective surface 100, a mold produced by mechanical cutting can be used. In addition, a duplicated mold based on the above mold can be used. At this time, it is desirable that the concavo-convex tip shape has a rounded shape in order to prevent the concavo-convex tip from being scratched.
  • the uneven shape of the reflective surface 100 may have a periodic structure.
  • the uneven shape of the reflecting surface 100 may be a triangular, trapezoidal, polygonal prism shape, various lens / prism shapes such as a cylindrical lens, or a hemispherical shape.
  • the pitch of the period of the uneven structure of the reflecting surface 100 is desirably 300 ⁇ m or less, and more desirably 200 ⁇ m or less.
  • the pitch of the period of the above structure is larger than 300 ⁇ m, the moldability is poor because the resin does not sufficiently enter the mold of the concave and convex shape when the reflecting surface 100 is molded.
  • the thickness is preferably 25 ⁇ m or more, and more preferably 50 ⁇ m or more.
  • the resin does not enter the concave / convex groove when the reflecting surface 100 is formed, and the shape of the concave / convex tip portion cannot be produced as usual.
  • the thickness of the structural layer 3 is not particularly limited, but is, for example, 30 ⁇ m or more and 500 ⁇ m or less.
  • the above-described production method is preferably selected as appropriate according to suitability with the following materials.
  • a scattering reflector for example, a curing agent, a plasticizer, a dispersant, various leveling agents, an ultraviolet absorber, an antioxidant, a viscosity modifier, A lubricant, a light stabilizer and the like may be appropriately blended.
  • the above-mentioned polymer composition is not particularly limited, and examples thereof include poly (meth) acrylic resins, polyurethane resins, fluorine resins, silicone resins, polyimide resins, epoxy resins, polyethylene resins, polypropylene resins, Methacrylic resin, polymethylpentene resin, cyclic polyolefin resin, polystyrene resin such as acrylonitrile- (poly) styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polyvinyl chloride Resin, polycarbonate resin, polyester resin, polyamide resin, polyamideimide resin, polyaryl phthalate resin, polysulfone resin, polyphenylene sulfide resin, polyethersulfone resin, polyethylene naphthalate resin , Polyetherimide-based resins, acetal resins, cellulose resins and the like, can be used as a mixture of these polymers alone
  • Examples of the polyol that is a raw material for the above polyurethane-based resin include a polyol obtained by polymerizing a monomer component containing a hydroxyl group-containing unsaturated monomer, or a polyester polyol obtained under the condition of excess hydroxyl group. Can be used alone or in admixture of two or more.
  • hydroxyl group-containing unsaturated monomers examples include (a) 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, allyl alcohol, homoallyl alcohol, cinnamon Hydroxyl group-containing unsaturated monomers such as alcohol and crotonyl alcohol, (b) for example ethylene glycol, ethylene oxide, propylene glycol, propylene oxide, butylene glycol, butylene oxide, 1,4-bis (hydroxymethyl) cyclohexane, phenylglycidyl Dihydric alcohols or epoxy compounds such as ether, glycidyl decanoate, Plaxel FM-1 (manufactured by Daicel Chemical Industries, Ltd.) and, for example, acrylic acid, methacrylic acid, maleic acid, fumaric acid, Tonsan, and the like hydroxyl group-containing unsaturated monomers obtained by reaction of an unsaturated carboxylic acid such as itac
  • the polyols described above are ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, tert-butyl acrylate, ethyl hexyl acrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, N-butyl methacrylate, tert-butyl methacrylate, ethyl hexyl methacrylate, glycidyl methacrylate, cyclohexyl methacrylate, styrene, vinyl toluene, 1-methylstyrene, acrylic acid, methacrylic acid, acrylonitrile, vinyl acetate, vinyl propionate, stearin Vinyl acid, allyl acetate, diallyl adipate, diallyl itaconate, diethyl maleate, vinyl chloride, vinylidene
  • the number average molecular weight of a polyol obtained by polymerizing a monomer component containing a hydroxyl group-containing unsaturated monomer is from 1,000 to 500,000, preferably from 5,000 to 100,000.
  • the hydroxyl value is 5 or more and 300 or less, preferably 10 or more and 200 or less, and more preferably 20 or more and 150 or less.
  • Polyester polyols obtained under conditions of excess hydroxyl groups include (c) ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl, for example.
  • Glycol hexamethylene glycol, decamethylene glycol, 2,2,4-trimethyl-1,3-pentanediol, trimethylolpropane, hexanetriol, glycerin, pentaerythritol, cyclohexanediol, hydrogenated bisphenol A, bis (hydroxymethyl) Polyhydric alcohols such as cyclohexane, hydroquinone bis (hydroxyethyl ether), tris (hydroxyethyl) isosinurate, xylylene glycol, and (d) for example malee , Fumaric acid, succinic acid, adipic acid, sebacic acid, azelaic acid, trimetic acid, terephthalic acid, phthalic acid, isophthalic acid and other polybasic acids, and propanediol, hexanediol, polyethylene glycol, trimethylolpropane It can be produced by reacting under the condition that the number of hydroxy
  • the number average molecular weight of the polyester polyol obtained under the above hydroxyl group-excess conditions is 500 or more and 300,000 or less, preferably 2000 or more and 100,000 or less.
  • the hydroxyl value is 5 or more and 300 or less, preferably 10 or more and 200 or less, and more preferably 20 or more and 150 or less.
  • the polyol used as the polymer material of the polymer composition is obtained by polymerizing the above-mentioned polyester polyol and the monomer component containing the above-mentioned hydroxyl group-containing unsaturated monomer, and is a (meth) acryl unit or the like
  • An acrylic polyol having If polyester polyol or acrylic polyol is used as the polymer material, the weather resistance is high, and yellowing of the structural layer 3 can be suppressed.
  • any one of this polyester polyol and acrylic polyol may be used, and both may be used.
  • the number of hydroxyl groups in the above-described polyester polyol and acrylic polyol is not particularly limited as long as it is 2 or more per molecule, but if the hydroxyl value in the solid content is 10 or less, the number of crosslinking points decreases, and the solvent resistance Film properties such as heat resistance, water resistance, heat resistance and surface hardness tend to decrease.
  • a scattering reflector may be contained in the polymer composition forming the structural layer 3 in order to improve reflection performance and heat resistance performance.
  • a scattering reflector in the polymer composition, the heat resistance of the structural layer 3 or the light reuse sheet 20 can be improved, and if a material having a refractive index significantly different from that of the polymer composition is used, light can be emitted. Can be reflected.
  • the metal reflective layer 4 does not need to be provided as shown in FIGS.
  • the inorganic material constituting the scattering reflector agent is not particularly limited. It is preferable to use an inorganic oxide as the inorganic substance.
  • silica or the like can be used, but a metal compound such as ZnS can also be used, but metal oxides such as TiO 2 , ZrO, and Al 2 O 3 are particularly desirable.
  • Silica hollow particles can also be used. Of these, TiO 2 is preferable because of its high refractive index and easy dispersibility.
  • the shape of the scattering reflector may be any particle shape such as a spherical shape, a needle shape, a plate shape, a scale shape, and a crushed shape, and is not particularly limited.
  • the lower limit of the average particle diameter of the scattering reflector is preferably 0.1 ⁇ m, and the upper limit is preferably 30 ⁇ m. If the average particle diameter is smaller than 0.1 ⁇ m, light is not sufficiently reflected. Further, if the average particle diameter is larger than 30 ⁇ m, the unevenness caused by the particles appears on the surface, and it is difficult to form a desired uneven shape.
  • the upper limit of the amount of the scattering reflector described above is preferably 100 parts. This is because when the amount of the inorganic filler is less than 30 parts, the light H1 incident on the structural layer 3 from the filler layer 21 cannot be sufficiently reflected. On the contrary, if the blending amount exceeds 100 parts, the moldability is poor.
  • a material having an organic polymer fixed on its surface may be used.
  • the scattering reflector fixed to the organic polymer the dispersibility in the polymer composition or the affinity with the polymer composition can be improved.
  • the organic polymer is not particularly limited with respect to its molecular weight, shape, composition, presence or absence of a functional group, and any organic polymer can be used.
  • arbitrary shapes such as a linear form, a branched form, and a crosslinked structure, are employable.
  • Specific resins constituting the above-mentioned organic polymer include, for example, (meth) acrylic resins, polyolefins such as polystyrene, polyvinyl acetate, polyethylene and polypropylene, polyesters such as polyvinyl chloride, polyvinylidene chloride and polyethylene terephthalate, and these Or a resin partially modified with a functional group such as an amino group, an epoxy group, a hydroxyl group, or a carboxyl group.
  • materials having an organic polymer containing a (meth) acrylic unit such as (meth) acrylic resin, (meth) acrylic-styrene resin, (meth) acrylic-polyester resin, etc., have a film forming ability.
  • the specific resin constituting the organic polymer is preferably a resin having compatibility with the above-described polymer composition, and is most preferably a material having the same composition as the polymer composition.
  • a polyol having a cycloalkyl group is preferable.
  • the polymer composition becomes highly hydrophobic, such as water repellency and water resistance, and the structural layer 3 and thus the light reuse sheet 20 under high temperature and high humidity conditions.
  • the bending resistance, dimensional stability, etc. are improved.
  • the basic properties of the coating layer such as weather resistance, hardness, and solvent resistance of the structural layer 3 are improved.
  • the affinity with the scattering reflector having the organic polymer fixed on the surface and the dispersibility of the scattering reflector are further improved.
  • isocyanate as a hardening
  • curing agent in a polymer composition, it becomes a much stronger crosslinked structure and the film physical property of the structure layer 3 further improves.
  • this isocyanate the same substance as the above-mentioned polyfunctional isocyanate compound is used. Of these, aliphatic isocyanates that prevent yellowing of the coating are preferred.
  • the scattering reflector may contain an organic polymer inside. Thereby, moderate softness and toughness can be imparted to the inorganic material that is the core of the scattering reflector.
  • the above-mentioned organic polymer preferably contains an alkoxy group, and the content thereof is not particularly limited, but is preferably 0.01 mmol or more and 50 mmol or less per 1 g of the scattering reflector.
  • the alkoxy group can improve the affinity with the polymer composition or the dispersibility in the polymer composition.
  • the aforementioned alkoxy group represents an RO group bonded to a metal element that forms a fine particle skeleton.
  • R is an alkyl group which may be substituted, and the RO groups in the fine particles may be the same or different. Specific examples of R include methyl, ethyl, n-propyl, isopropyl, n-butyl and the like.
  • the same metal alkoxy group as the metal constituting the scattering reflector is preferably used. When the scattering reflector is colloidal silica, it is preferable to use an alkoxy group having silicon as a metal.
  • the content of the organic polymer in the scattering reflector to which the organic polymer is fixed is not particularly limited, but is preferably 0.5% by mass or more and 50% by mass or less based on the scattering reflector.
  • surface treatment may be performed on the deposition target surface of the reflective layer 4 (the surface of the structural layer 3) in order to improve the tight adhesion and the like (not shown).
  • Examples of such surface treatment include (a) corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals, and (b) primer.
  • Examples of the coating treatment include undercoat treatment, anchor coat treatment, and vapor deposition anchor coat treatment. Among these surface treatments, corona discharge treatment and anchor coat treatment that improve the adhesive strength with the reflective layer 4 and contribute to the formation of a dense and uniform reflective layer 4 are preferable.
  • Examples of the anchor coating agent used in the above-described anchor coating treatment include a polyester anchor coating agent, a polyamide anchor coating agent, a polyurethane anchor coating agent, an epoxy anchor coating agent, a phenol anchor coating agent, and a (meth) acrylic anchor.
  • Examples thereof include a coating agent, a polyvinyl acetate anchor coating agent, a polyolefin anchor coating agent such as polyethylene aly polypropylene, and a cellulose anchor coating agent.
  • polyester anchor coating agents that can further improve the adhesive strength of the reflective layer 4 are particularly preferable.
  • the coating amount (in terms of solid content) of the above-described anchor coating agent is preferably 1 g / m 2 or more and 3 g / m 2 or less.
  • the coating amount of the anchor coating agent is less than 1 g / m 2, the effect of improving the adhesion of the reflective layer 4 becomes small.
  • the coating amount of the anchor coating agent is more than 3 g / m 2 , the strength, durability and the like of the light reuse sheet 20 may be lowered.
  • a silane coupling agent used for improving tight adhesion a silane coupling agent used for improving tight adhesion
  • an anti-blocking agent used for preventing blocking an ultraviolet absorber used for improving weather resistance
  • Various additives such as can be mixed as appropriate.
  • the mixing amount of the additive is preferably 0.1% by weight or more and 10% by weight or less from the balance between the effect expression of the additive and the function inhibition of the anchor coat agent. If the above-mentioned additive is less than 0.1% by weight, blocking cannot be sufficiently prevented and sufficient weather resistance cannot be obtained, and if it is more than 10% by weight, the function of the topcoat agent is inhibited.
  • the reflective layer 4 is a layer that reflects light incident on the light reuse sheet 20.
  • the reflective layer 4 is formed by vapor-depositing a metal along the surface on which the uneven shape of the structural layer 3 is formed.
  • the vapor deposition apparatus used for forming the reflective layer 4 is not particularly limited as long as a metal can be vapor deposited without causing deterioration such as shrinkage and yellowing in the structural layer 3.
  • Physical vapor deposition methods Physical Vapor Deposition method: PVD method
  • PVD method Physical Vapor Deposition method
  • ion plating method ion cluster beam method
  • PECVD method Plasma chemical vapor deposition method
  • thermal chemical vapor deposition method thermal chemical vapor deposition method
  • CVD method chemical vapor deposition method
  • a vacuum vapor deposition method or an ion plating method that can form a high-quality reflective layer 4 with high productivity is preferable.
  • the metal used for the reflective layer 4 is not particularly limited as long as it has a metallic luster and can be deposited.
  • Examples of the metal used for the reflective layer 4 include aluminum, silver, gold, nickel, tin, and zirconium. Among these, aluminum is preferable because it is highly reflective and the dense reflective layer 4 can be formed relatively easily.
  • the reflective layer 4 may have a single layer structure or a multilayer structure of two or more layers.
  • the deterioration of the structural layer 3 is reduced by reducing the thermal burden applied during vapor deposition, and the adhesion between the structural layer 3 and the reflective layer 4 is further improved. Can do.
  • a metal oxide layer may be provided on the metal film.
  • the vapor deposition conditions in the above physical vapor deposition method and chemical vapor deposition method are appropriately designed according to the resin type of the structural layer 3 or the substrate 2, the thickness of the reflective layer 4, and the like.
  • the thickness of the reflection layer 4 As a minimum of the thickness of the reflection layer 4, 10 nm is preferable and 20 nm is especially preferable.
  • the upper limit of the thickness of the reflective layer 4 is preferably 200 nm, and particularly preferably 100 nm. If the thickness of the reflective layer 4 is smaller than the lower limit of 10 nm, the light incident on the reflective layer 4 from the filling layer 21 cannot be sufficiently reflected. Further, even if the thickness is 20 nm or more, the light reflected by the reflection layer 4 does not increase. On the other hand, when the thickness of the reflective layer 4 exceeds the upper limit of 200 nm, a crack that can be visually confirmed occurs in the reflective layer 4.
  • the outer surface of the reflective layer 4 is preferably subjected to a top coat treatment (not shown).
  • a top coat treatment (not shown).
  • topcoat agent used in the above-described topcoat treatment examples include a polyester topcoat agent, a polyamide topcoat agent, a polyurethane topcoat agent, an epoxy topcoat agent, a phenol topcoat agent, and a (meth) acrylic top.
  • examples thereof include a coating agent, a polyvinyl acetate top coating agent, a polyolefin top coating agent such as polyethylene aly polypropylene, and a cellulose top coating agent.
  • polyester-based topcoat agents that have high adhesive strength with the reflective layer 4 and contribute to surface protection of the reflective layer 4, sealing of defects, and the like are particularly preferable.
  • the coating amount (in terms of solid content) of the above-mentioned topcoat agent is preferably 3 g / m 2 or more and 7 g / m 2 or less.
  • the coating amount of the top coat agent is smaller than 3 g / m 2 , the effect of sealing and protecting the reflective layer 4 may be reduced.
  • the coating amount of the topcoat agent exceeds 7 g / m 2 above, the sealing and protection effect of the reflective layer 4 does not increase so much, and the thickness of the light reuse sheet 20 increases instead. .
  • a silane coupling agent used for improving tight adhesion a silane coupling agent used for improving tight adhesion
  • an ultraviolet absorber used for improving weather resistance an inorganic used for improving heat resistance
  • Various additives such as a filler can be appropriately mixed.
  • the mixing amount of the additive is preferably 0.1% by weight or more and 10% by weight or less in view of the balance between the effect expression of the additive and the function inhibition of the topcoat agent. If the above-mentioned additive is less than 0.1% by weight, close adhesion, weather resistance and heat resistance cannot be sufficiently obtained, and if it is more than 10% by weight, the function of the topcoat agent is inhibited.
  • the base material 2 constituting the light reuse sheet 20 is formed by sheet molding using a synthetic resin as a material.
  • a synthetic resin used for the substrate 2
  • a material having weather resistance such as water resistance and durability against ultraviolet rays is desirable in view of being installed outdoors.
  • polyethylene resins such as polyethylene terephthalate resin (PET resin), polypropylene resins, methacrylic resins, polymethylpentene resins, cyclic polyolefin resins, polystyrene resins, acrylonitrile- (poly) styrene copolymers (AS resins) , Acrylonitrile-butadiene-styrene copolymer (ABS resin), polyvinyl chloride resin, fluorine resin, poly (meth) acrylic resin, polycarbonate resin, polyester resin, polyamide resin, polyimide resin, polyamideimide Resin, polyaryl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin,
  • polyimide resins, polycarbonate resins, polyester resins, fluorine resins, polylactic acid resins are resins having high heat resistance, strength, weather resistance, durability, gas barrier properties against water vapor and the like. preferable.
  • polyester resin examples include polyethylene terephthalate and polyethylene naphthalate.
  • polyester-based resins polyethylene terephthalate is particularly preferable because it has a good balance between various functions such as heat resistance and weather resistance, and price.
  • fluororesin examples include polytetrafluoroethylene (PTFE), perfluoroalkoxy resin (PFA) made of a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, and a copolymer of tetrafluoroethylene and hexafluoropropylene (FEP).
  • PTFE polytetrafluoroethylene
  • PFA perfluoroalkoxy resin
  • FEP hexafluoropropylene
  • Examples of the above-mentioned cyclic polyolefin resin include polymerization of cyclic dienes such as a) cyclopentadiene (and derivatives thereof), dicyclopentadiene (and derivatives thereof), cyclohexadiene (and derivatives thereof), norbornadiene (and derivatives thereof), and the like. And b) a copolymer obtained by copolymerizing a cyclic diene with one or more olefinic monomers such as ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, and isoprene. It is done.
  • cyclic dienes such as a) cyclopentadiene (and derivatives thereof), dicyclopentadiene (and derivatives thereof), cyclohexadiene (and derivatives thereof), norbornadiene (and derivatives thereof), and the like.
  • cyclopentadiene (and derivatives thereof), dicyclopentadiene (and derivatives thereof) or norbornadiene (and derivatives thereof) such as polymers having excellent strength, heat resistance, and weather resistance are particularly preferred. preferable.
  • the above-mentioned synthetic resin can be used 1 type or in mixture of 2 or more types.
  • various additives and the like can be mixed in the forming material of the base material 2 for the purpose of improving and modifying processability, heat resistance, weather resistance, mechanical properties, dimensional stability, and the like.
  • the additive include a lubricant, a crosslinking agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a filler, a reinforcing fiber, a reinforcing agent, an antistatic agent, a flame retardant, a flame retardant, a foaming agent, and an antifungal agent.
  • the method for forming the substrate 2 is not particularly limited, and known methods such as an extrusion method, a cast forming method, a T-die method, a cutting method, and an inflation method are employed.
  • the thickness is preferably 25 ⁇ m or more and 500 ⁇ m or less, and particularly preferably 250 ⁇ m.
  • the thickness of the base material 2 is less than 25 ⁇ m, curling occurs during the coating process of the structural layer 3 due to the effect of curing shrinkage of an ultraviolet curable resin or the like, and a problem occurs when incorporating into the solar cell module 400.
  • the thickness of the base material 2 exceeds 500 ⁇ m, the film weight increases and the weight of the solar cell module 400 also increases. If it is 250 micrometers or less, the lighter-weight solar cell module 400 is realizable.
  • the base material 2, the structural layer 3, and the base material 2 may contain an ultraviolet stabilizer or a polymer in which an ultraviolet stabilizing group is bonded to a molecular chain.
  • an ultraviolet stabilizer or ultraviolet stabilizer radicals generated by ultraviolet rays, active oxygen, etc. are inactivated, and the ultraviolet stability, weather resistance, etc. of the light reuse sheet 20 can be improved.
  • a hindered amine ultraviolet stabilizer or a hindered amine ultraviolet stabilizer having high stability against ultraviolet rays is preferably used.
  • the solar cell module 400 using the light reuse sheet 20 having such a configuration the light incident on the region R1 between the adjacent solar cells 30 is reflected by the reflection surface 100 of the light reuse sheet 20.
  • the solar cell 30 can be made incident. Thereby, the light incident on the region R1 between the adjacent solar cells 30 can also be used, and the power generation efficiency of the solar cell module 400 can be improved.
  • the light reuse sheet 20 can also be arranged with the back surface of the reflective surface 100 of the light reuse sheet 20 facing the filling layer side 21 as shown in FIG.
  • a structure having a barrier layer made of an aluminum layer of 10 ⁇ m to 30 ⁇ m or a silica layer of 10 nm to 100 nm can be used for the light reuse sheet 20.
  • a solar cell module by apply
  • the light reuse sheet 20 can be used for reusing light from a solid light emitting element 50 such as an EL.
  • FIG. 38 shows a cross-sectional view of one embodiment of the light source module 410 of the present invention.
  • the light source module 410 includes the filling layer 21, the light emitting element 50, and the light reuse sheet 20.
  • the light emitting element 50 has a function of converting electricity into light by electroluminescence, and is emitted from the light receiving and emitting surface 160.
  • the light emitting element 50 is preferably a solid light emitting diode such as an LED, an organic EL, or an inorganic EL.
  • the filling layer 21 is a layer that seals the light emitting element 50.
  • the light emitted from the light emitting element 50 is transmitted through the filling layer 21, partly becomes light M ⁇ b> 30 emitted from the emission surface 150, and part becomes light M ⁇ b> 31 reflected by the emission surface 150.
  • a material having a high light transmittance is used to transmit light incident on the filling layer 21, and an acrylic resin having a high transmittance is preferably used.
  • the light M ⁇ b> 31 reflected by the emission surface 150 is reflected by the emission surface 150 and enters the reflection surface 100 of the light reuse sheet 20.
  • the light M ⁇ b> 2 that enters the reflecting surface is reflected by the reflecting surface 100 and then enters the exit surface 150.
  • the reflected light M1 that is reflected by the reflecting surface 100 and incident on the exit surface 150 exits from the exit surface 150 to the outside.
  • Example 5 In Example 5, a 250 ⁇ m PET film was used as the substrate 2.
  • the structural layer 3 a layer in which a triangular prism-shaped concavo-convex structure in which the apex angle of the reflective surface 100 with a pitch of 150 ⁇ m made of UV-curable acrylic resin is 135 ° is formed is laminated on the PET film, and the metallic reflective layer 4 is formed.
  • a 100 nm aluminum layer was formed by vapor deposition to obtain a light reuse sheet 20.
  • a solar cell module 400 was produced using the light reuse sheet 20 produced in this manner.
  • the front plate 22 is a glass plate having a thickness of about 3 mm.
  • the solar cell 30 is disposed at a position 0.5 mm from the front plate 22. Formed.
  • a polycrystalline silicon solar battery having a 150 mm square and a thickness of 0.2 mm is used as the solar battery cell 30.
  • the above-mentioned light reuse sheet 20 was arranged to measure the power generation efficiency. Table 2 shows the results
  • Example 6 In Example 6, a 250 ⁇ m PET film was used as the substrate 2.
  • the structural layer 3 a layer in which a triangular prism-shaped concavo-convex structure in which the apex angle of the reflective surface 100 having a pitch of 200 ⁇ m and a pitch of 200 ⁇ m is 120 ° is formed is laminated on the PET film, and the metallic reflective layer 4 is formed.
  • a 100 nm aluminum layer was formed by vapor deposition to obtain a light reuse sheet 20.
  • a solar cell module 400 was produced using the light reuse sheet 20 produced in this manner.
  • the front plate 22 is a glass plate having a thickness of about 3 mm.
  • the solar cell 30 is disposed at a position 0.5 mm from the front plate 22. Formed.
  • a polycrystalline silicon solar battery having a 150 mm square and a thickness of 0.2 mm is used as the solar battery cell 30.
  • the above-mentioned light reuse sheet 20 was arranged to measure the power generation efficiency. Table 2 shows the results
  • Example 7 In Example 7, a 250 ⁇ m PET film was used as the substrate 2.
  • a layer in which a triangular prism-like concavo-convex structure with a vertical angle of 115 ° of the reflective surface 100 having a pitch of 200 ⁇ m made of an ultraviolet curable acrylic resin is formed on a PET film is formed as a metallic reflective layer 4.
  • a 100 nm aluminum layer was formed by vapor deposition to obtain a light reuse sheet 20.
  • a solar cell module 400 was produced using the light reuse sheet 20 produced in this manner.
  • the front plate 22 is a glass plate having a thickness of about 3 mm.
  • the solar cell 30 is disposed at a position 0.5 mm from the front plate 22. Formed.
  • a polycrystalline silicon solar battery having a 150 mm square and a thickness of 0.2 mm is used as the solar battery cell 30.
  • the above-mentioned light reuse sheet 20 was arranged to measure the power generation efficiency. Table 2 shows the results of the power generation efficiency.
  • Example 8 In Example 8, a 250 ⁇ m PET film was used as the substrate 2.
  • the structural layer 3 a layer on which a prism-like concavo-convex structure in which the apex angle of the reflective surface 100 with a pitch of 15 ⁇ m and a pitch of 15 ⁇ m is 135 ° is formed is laminated on a PET film, and the metallic reflective layer 4 is 100 nm.
  • seat 20 was obtained by forming the aluminum layer of this by vapor deposition. Using this, a solar cell module 400 was produced.
  • the front plate 22 is a glass plate having a thickness of about 3 mm.
  • the solar cell 30 is disposed at a position 0.5 mm from the front plate 22. Formed.
  • a polycrystalline silicon solar cell having a 150 mm square and a thickness of 0.2 mm is used as the solar battery cell 30.
  • the solar battery cell 30 has a width of about 25 mm around the solar battery cell 30 at a position 1.0 mm from the light receiving surface J of the solar battery cell 30.
  • the above-mentioned light reuse sheet 20 was arranged to measure the power generation efficiency. Table 2 shows the results of the power generation efficiency.
  • Example 9 In Example 9, a 250 ⁇ m PET film was used as the substrate 2.
  • seat 20 was obtained by forming the aluminum layer of this by vapor deposition.
  • a solar cell module 400 was produced using the light reuse sheet 20 produced in this manner.
  • the front plate 22 is a glass plate having a thickness of about 3 mm.
  • the solar cell 30 is disposed at a position 0.5 mm from the front plate 22. Formed.
  • a polycrystalline silicon solar cell having a 150 mm square and a thickness of 0.2 mm is used as the solar battery cell 30.
  • the solar battery cell 30 has a width of about 25 mm around the solar battery cell 30 at a position 1.0 mm from the light receiving surface J of the solar battery cell 30.
  • the above-mentioned light reuse sheet 20 was arranged to measure the power generation efficiency. Table 2 shows the results of the power generation efficiency.
  • Comparative Example 2 In Comparative Example 2, a 250 ⁇ m PET film was used as the substrate 2. The structural layer 3 was not formed, and an aluminum layer having a thickness of 100 nm was formed as the metal reflective layer 4 by vapor deposition to obtain a light reuse sheet 20. A solar cell module 400 was produced using the light reuse sheet 20 produced in this manner.
  • the front plate 22 is a glass plate having a thickness of about 3 mm.
  • the solar cell 30 is disposed at a position 0.5 mm from the front plate 22. Formed.
  • a polycrystalline silicon solar battery having a 150 mm square and a thickness of 0.2 mm is used as the solar battery cell 30.
  • the above-mentioned light reuse sheet 20 was arranged to measure the power generation efficiency. Table 2 shows the results of the power generation efficiency.
  • the present invention has a concavo-convex structure on at least one surface, and deflects light in a specific direction by light diffraction, scattering, refraction, or reflection action by the concavo-convex structure, and conventionally has been a loss. It is useful for a light reuse sheet that can reuse the light that has been used, and a solar cell module and a light source module that use this light reuse sheet.
  • A Area where reflected light is incident on the light receiving surface in the interval between solar cells B, B1: Area where reflected light is not incident on the light receiving surface among intervals between solar cells
  • C Light reusing sheet reflecting surface and sun
  • F Light source direction
  • G Space between solar cells
  • H Height from the front surface of the solar cell to the light reuse sheet
  • H0 Light perpendicularly incident on the solar cell module
  • W Solar cell Width
  • H1 Light incident on the reflecting surface
  • H11, H12 Reflected light
  • H3 Reused light
  • H10 Light incident perpendicularly to the solar cells
  • NB Sheet normal L: Among the gaps between the solar cells Length of region where reflected light is not incident on light receiving surface
  • Lx Horizontal dimension of solar cell Ly: Vertical dimension of solar cell NG: Normal of front plate ne ...
  • Refractive index of packed layer ng ... Front plate The refractive index of the material on the reflective surface Refractive index N0: Reflection surface normal P: Plane S: Light source Sx: Light reuse region in the horizontal direction from the vertical side surface Sy: Light reuse region in the horizontal direction from the lateral side surface Tx: Side surface in the vertical direction of the solar battery cell Reuse region of light incident on the light receiving surface from Ty ... Reuse region of light incident on the light receiving surface from the lateral side surface of the solar battery cell WN ... End of the solar cell on the reflected light incident side WF ...

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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

L’invention concerne une feuille de réutilisation de lumière qui comprend un plan de réflexion (100) avec une forme concavo-convexe pour réfléchir de la lumière, qui est entrée dans un module de batterie solaire (200), de telle sorte que la lumière entre dans une cellule de batterie solaire (1), ou réfléchir de la lumière émise à partir d'un élément électroluminescent (50) d'un module de source lumineuse (300). Lorsque la dimension, dans la direction latérale, de la cellule de batterie solaire (1) ou de l'élément électroluminescent (50) est dénotée par Lx, que la dimension de la direction longitudinale de la cellule de batterie solaire (1) ou de l'élément électroluminescent (50) est dénotée par Ly, que l'angle formé par la direction de la forme concavo-convexe du plan de réflexion (100) et le bord dans la direction latérale de la cellule de batterie solaire (1) ou de l'élément électroluminescent (50) est dénoté par φ, et que la largeur maximale de lumière qui est transmise entre les cellules de batterie solaire adjacentes (1) et réfléchie par la feuille de réutilisation de lumière (12), et qui entre dans le plan de réception de lumière (1a) de la cellule de batterie solaire (1), ou que la largeur maximale de la lumière, qui n'est pas émise dans une direction spécifique à partir de l'élément électroluminescent (50) mais qui est émise dans une direction spécifique après avoir été réfléchie par la feuille de réutilisation de lumière (12), est dénotée par A, le plan de réflexion (100) satisfait l'expression (1).
PCT/JP2009/006237 2008-11-19 2009-11-19 Feuille de réutilisation de lumière, module de batterie solaire et module de source lumineuse WO2010058585A1 (fr)

Priority Applications (4)

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CN200980146248.6A CN102217090B (zh) 2008-11-19 2009-11-19 光再利用薄片、太阳能电池模块及光源模块
JP2010518186A JP5068854B2 (ja) 2008-11-19 2009-11-19 太陽電池モジュール及び光源モジュール
EP09827366A EP2355166A1 (fr) 2008-11-19 2009-11-19 Feuille de reutilisation de lumiere, module de batterie solaire et module de source lumineuse
US12/998,677 US20110240095A1 (en) 2008-11-19 2009-11-19 Light reuse sheet, solar battery module, and light source module

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JP2008-295374 2008-11-19
JP2008295374 2008-11-19
JP2009-160853 2009-07-07
JP2009160853 2009-07-07

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EP (1) EP2355166A1 (fr)
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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102664210A (zh) * 2012-05-14 2012-09-12 友达光电股份有限公司 太阳能模块与其制造方法
WO2013051519A1 (fr) * 2011-10-04 2013-04-11 旭硝子株式会社 Module de cellule solaire en film mince et procédé de fabrication d'un module de cellule solaire en film mince
WO2014114286A1 (fr) * 2013-01-28 2014-07-31 Curto, Vincenzo Gabriele Système de surface réfléchissante pour installations photovoltaïques
WO2016025969A1 (fr) * 2014-08-20 2016-02-25 Joanneum Research Forschungsgesellschaft Mbh Module photovoltaïque présentant une structure intégrée orientant la lumière sur base d'une réflexion interne totale
JP2016525707A (ja) * 2013-07-09 2016-08-25 スリーエム イノベイティブ プロパティズ カンパニー ソーラーモジュールにおける使用のための円形微細構造を持つ反射フィルム
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FR3038139A1 (fr) * 2015-06-24 2016-12-30 Lionel Girardie Dispositif optique photovoltaique a filtration plasmonique et multirefringence variable arriere total
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FR3042356A1 (fr) * 2015-10-12 2017-04-14 Athelios Dispositif photonique encapsule entre cellules solaires
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* Cited by examiner, † Cited by third party
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WO2018061788A1 (fr) * 2016-09-28 2018-04-05 パナソニックＩｐマネジメント株式会社 Module de cellule solaire et procédé de fabrication d'un module de cellule solaire
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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11243225A (ja) * 1998-02-26 1999-09-07 Hitachi Ltd 太陽光発電装置及び太陽光発電モジュール並びに太陽光発電システムの設置方法
JPH11307791A (ja) * 1998-04-22 1999-11-05 Sanyo Electric Co Ltd 太陽電池モジュール
JP2000101124A (ja) * 1998-09-18 2000-04-07 Hitachi Ltd 集光型太陽光発電モジュール及びその製造方法並びに集光型太陽光発電システム
JP2001516149A (ja) * 1997-08-19 2001-09-25 デイスター・テクノロジーズ・インク 反射集中式太陽電池アセンブリ
JP2002043600A (ja) * 2000-07-21 2002-02-08 Tokyo Univ Of Agriculture & Technology 平板集光太陽電池モジュール
JP2005159149A (ja) * 2003-11-27 2005-06-16 Aoki Denki Kogyo Kk 高輝度ｌｅｄ発光部
JP2005244095A (ja) * 2004-02-27 2005-09-08 Matsushita Electric Ind Co Ltd 面状光源、及び液晶表示装置
JP2006147984A (ja) * 2004-11-24 2006-06-08 Sanyo Electric Co Ltd 太陽電池モジュール
JP2006344964A (ja) * 2005-06-06 2006-12-21 General Electric Co <Ge> 太陽エネルギーシステムの光起電力集中装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5288337A (en) * 1992-06-25 1994-02-22 Siemens Solar Industries, L.P. Photovoltaic module with specular reflector
JPH10284747A (ja) * 1997-04-11 1998-10-23 Sharp Corp 太陽電池モジュール
JP2000323740A (ja) * 1999-05-11 2000-11-24 Hitachi Ltd 集光型太陽光発電装置
JP2001119054A (ja) * 1999-10-15 2001-04-27 Hitachi Ltd 集光型太陽光発電装置
US20080000517A1 (en) * 2003-06-10 2008-01-03 Gonsiorawski Ronald C Photovoltaic module with light reflecting backskin
EP1711967A1 (fr) * 2004-01-23 2006-10-18 Origin Energy Solar Pty Ltd. Panneau solaire
DE102005027737B4 (de) * 2005-06-16 2013-03-28 Saint-Gobain Glass Deutschland Gmbh Verwendung einer transparenten Scheibe mit einer dreidimensionalen Oberflächenstruktur als Deckscheibe für Bauelemente zur Nutzung des Sonnenlichts
TW200845405A (en) * 2007-02-06 2008-11-16 American Solar Technologies Inc Solar electric module with redirection of incident light
TW200840065A (en) * 2007-03-20 2008-10-01 Hsuen-Li Chen Solar cell
TWI378266B (en) * 2007-04-20 2012-12-01 Chi Lin Technology Co Ltd Lighting device, a direct type backlight module and other related electronic devices with the same and a method for manufacturing thereof
GB2452737B (en) * 2007-09-12 2011-09-14 Roger Seaman Light emitting and/or receiving apparatus

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001516149A (ja) * 1997-08-19 2001-09-25 デイスター・テクノロジーズ・インク 反射集中式太陽電池アセンブリ
JPH11243225A (ja) * 1998-02-26 1999-09-07 Hitachi Ltd 太陽光発電装置及び太陽光発電モジュール並びに太陽光発電システムの設置方法
JPH11307791A (ja) * 1998-04-22 1999-11-05 Sanyo Electric Co Ltd 太陽電池モジュール
JP2000101124A (ja) * 1998-09-18 2000-04-07 Hitachi Ltd 集光型太陽光発電モジュール及びその製造方法並びに集光型太陽光発電システム
JP2002043600A (ja) * 2000-07-21 2002-02-08 Tokyo Univ Of Agriculture & Technology 平板集光太陽電池モジュール
JP2005159149A (ja) * 2003-11-27 2005-06-16 Aoki Denki Kogyo Kk 高輝度ｌｅｄ発光部
JP2005244095A (ja) * 2004-02-27 2005-09-08 Matsushita Electric Ind Co Ltd 面状光源、及び液晶表示装置
JP2006147984A (ja) * 2004-11-24 2006-06-08 Sanyo Electric Co Ltd 太陽電池モジュール
JP2006344964A (ja) * 2005-06-06 2006-12-21 General Electric Co <Ge> 太陽エネルギーシステムの光起電力集中装置

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JP2016525707A (ja) * 2013-07-09 2016-08-25 スリーエム イノベイティブ プロパティズ カンパニー ソーラーモジュールにおける使用のための円形微細構造を持つ反射フィルム
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FR3038142A1 (fr) * 2015-06-24 2016-12-30 Lionel Girardie Dispositif optique photovoltaique a filtration plasmonique simple arriere
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FR3042341A1 (fr) * 2015-10-08 2017-04-14 Athelios Dispositif optique photovoltaique a filtration plasmonique frontale et multirefringence variable arriere simple convave et double convexe localement
FR3042350A1 (fr) * 2015-10-08 2017-04-14 Athelios Dispositif photonique non encapsule d'augmentation de rendement photovoltaique
FR3042336A1 (fr) * 2015-10-08 2017-04-14 Athelios Dispositif optique photovoltaique a filtration dichroique variable avec miroir dichroique concave simple et convexe double localement
FR3042342A1 (fr) * 2015-10-08 2017-04-14 Athelios Dispositif optique photovoltaique a filtration plasmonique frontale et multirefringence variable arriere simple convexe et double concave localement
FR3042335A1 (fr) * 2015-10-08 2017-04-14 Athelios Dispositif optique phovaltaique a filtration dichroique variable avec miroir dichroique convexe simple et concave double localement
FR3042339A1 (fr) * 2015-10-08 2017-04-14 Athelios Dispositif optique photovoltaique a filtration plasmonique bifaciale et multirefringence variable arriere simple concave et double convexe localement
FR3042340A1 (fr) * 2015-10-08 2017-04-14 Athelios Dispositif optique photovoltaique a filtration plasmonique bifaciale et multirefringence variable arriere simple convexe et double concave localement
FR3042356A1 (fr) * 2015-10-12 2017-04-14 Athelios Dispositif photonique encapsule entre cellules solaires
FR3042357A1 (fr) * 2015-10-12 2017-04-14 Athelios Dispositif optique photovoltaique a filtration plasmonique bifacial

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JP5068854B2 (ja) 2012-11-07
CN102217090A (zh) 2011-10-12
TWI469375B (zh) 2015-01-11
JPWO2010058585A1 (ja) 2012-04-19
CN103545394A (zh) 2014-01-29
US20110240095A1 (en) 2011-10-06

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