WO2016035311A1 - Filtre de conversion de longueur d'onde et module de cellule solaire l'utilisant - Google Patents

Filtre de conversion de longueur d'onde et module de cellule solaire l'utilisant Download PDF

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Publication number
WO2016035311A1
WO2016035311A1 PCT/JP2015/004395 JP2015004395W WO2016035311A1 WO 2016035311 A1 WO2016035311 A1 WO 2016035311A1 JP 2015004395 W JP2015004395 W JP 2015004395W WO 2016035311 A1 WO2016035311 A1 WO 2016035311A1
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Prior art keywords
wavelength
light
phosphor
scattering material
transparent resin
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PCT/JP2015/004395
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English (en)
Japanese (ja)
Inventor
善光 生駒
真治 柴本
崇志 岡田
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パナソニックＩｐマネジメント株式会社
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Priority to JP2016546312A priority Critical patent/JP6358548B2/ja
Publication of WO2016035311A1 publication Critical patent/WO2016035311A1/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
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/055—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means where light is absorbed and re-emitted at a different wavelength by the optical element directly associated or integrated with the PV cell, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/52—PV systems with concentrators

Definitions

  • the present invention relates to a wavelength conversion technique, and more particularly to a wavelength conversion filter that converts a wavelength of light having an excitation wavelength and a solar cell module using the same.
  • Solar cells for converting sunlight into electrical energy are clean renewable energy, but in general, only light of some wavelengths of sunlight is used for photoelectric conversion, which is the photoelectric conversion efficiency. It is a factor of decline. Therefore, a wavelength conversion layer that converts light having a wavelength that cannot be used in the solar cell into light having a usable wavelength is provided.
  • phosphor particles having an average particle diameter of 100 nm are used in order to reduce scattering on the surface of the phosphor particles (see, for example, Patent Document 1).
  • the present invention has been made in view of such circumstances, and an object thereof is to provide a technique for suppressing a decrease in transmittance while converting light having an unusable wavelength into light having a usable wavelength. It is in.
  • a wavelength conversion filter includes a transparent resin, a phosphor mixed with the transparent resin, and a fluorescent resin mixed with the transparent resin.
  • This solar cell module is a solar cell module in which a protective member, a sealing member, and solar cells are stacked, and the sealing member is mixed with a transparent resin, a phosphor mixed with the transparent resin, and the transparent resin. And a scattering material that scatters light having an excitation wavelength of the phosphor rather than light having an emission wavelength of the phosphor.
  • the present invention it is possible to suppress a decrease in transmittance while converting light having an unusable wavelength into light having a usable wavelength.
  • FIG. 5A and 5B are diagrams showing the scattering intensity distribution and the scattering intensity distribution in which the component in the straight direction is normalized to 1 when the particle diameter of the scattering material in FIG. 3 is 100 nm.
  • 6A and 6B are diagrams showing the scattering intensity distribution and the scattering intensity distribution in which the component in the straight direction is normalized to 1 when the particle size of the scattering material in FIG. 3 is 300 nm.
  • FIGS. 8A and 8B are diagrams showing the scattering intensity distribution when the particle size of the scattering material of FIG. It is a figure which shows the wavelength dependence of the transmittance
  • the Example of this invention is related with the solar cell module provided with the photovoltaic cell.
  • photoelectric conversion efficiency is lower for light in the low wavelength region of ultraviolet light and visible light than in light in other wavelength regions of visible light.
  • a phosphor is mixed in the sealing member of the solar battery cell, and the phosphor is in response to light in the low wavelength region of ultraviolet light and visible light. To convert the wavelength.
  • the particle size of phosphors has been set to several tens of nm in order to suppress a decrease in transmittance of the sealing member.
  • the phosphor has a larger particle size, and should be, for example, several ⁇ m.
  • the transmittance of the sealing member is decreased, so that visible light is reflected and the photoelectric conversion efficiency of the solar battery cell is decreased.
  • the purpose of this example is to suppress a decrease in transmittance for light having a high photoelectric conversion efficiency in a solar battery cell while improving the wavelength conversion efficiency by increasing the particle size of the phosphor. .
  • FIG. 1 is a cross-sectional view showing a configuration of a solar cell module 100 according to an embodiment of the present invention.
  • the solar cell module 100 includes a solar cell 10, a first tab wire 16 a collectively referred to as a tab wire 16, a second tab wire 16 b, a first sealing member 18 a collectively referred to as a sealing member 18, and a second sealing member. 18b, the 1st protection member 20a and the 2nd protection member 20b which are named the protection member 20 generically.
  • the solar battery cell 10 absorbs incident light and generates a photovoltaic power, and is formed of a semiconductor material such as crystalline silicon, gallium arsenide (GaAs), or indium phosphorus (InP).
  • the structure of the solar battery cell 10 is not particularly limited, but here, as an example, it is assumed that crystalline silicon and amorphous silicon are stacked.
  • the solar battery cell 10 has a light receiving surface 12 that is one of the surfaces of the solar battery cell 10 and a back surface 14 facing away from the light receiving surface 12.
  • the light receiving surface 12 means a main surface on which solar light is mainly incident in the solar battery cell 10, and specifically, a surface on which most of the light incident on the solar battery cell 10 is incident. It is. Further, electrodes (not shown) are provided on the light receiving surface 12 and the back surface 14.
  • FIG. 2 shows the wavelength dependence of the external quantum efficiency of the solar battery cell 10.
  • the horizontal axis indicates the wavelength
  • the vertical axis indicates the external quantum efficiency of the solar battery cell 10.
  • the external quantum efficiency is the ratio of the number of electrons output from the solar cell 10 to the number of photons incident on the solar cell 10, and the higher the external quantum efficiency, the higher the photoelectric conversion efficiency. It can be said.
  • the external quantum efficiency shows a substantially constant high value. It can be said that such a wavelength is higher than that of visible green light.
  • the external quantum efficiency decreases as the wavelength becomes shorter.
  • the slope of the external quantum efficiency with respect to the wavelength becomes steeper at the wavelength of 450 nm or less than the wavelength of 500 nm to 450 nm.
  • the former wavelength corresponds to the wavelength of visible blue light
  • the latter wavelength corresponds to violet light and ultraviolet light of visible light.
  • the tab wire 16 is adhered on the light receiving surface 12 and the back surface 14 so as to be electrically connected to an electrode (not shown).
  • the tab wire 16 and the electrode may be connected via a resin layer.
  • the tab line 16 extends in the horizontal direction of FIG. 1 where a plurality of solar cells 10 are arranged, and the electrode on the light receiving surface 12 side of one adjacent solar cell 10 and the other solar cell 10 (not shown). ) On the back surface 14 side.
  • the first protective member 20a is provided on the light receiving surface 12 side of the solar battery cell 10, and protects the solar battery cell 10 from the external environment and transmits light to be absorbed by the solar battery cell 10.
  • the first protection member 20a is, for example, a glass substrate.
  • the first protective member 20a may be polycarbonate, acrylic, polyester, or fluorinated polyethylene in addition to the glass substrate.
  • the second protective member 20 b is a back sheet provided on the back surface 14 side of the solar battery cell 10.
  • the second protective member 20b may be the same glass as the first protective member 20a or a transparent substrate such as plastic.
  • the first protection is achieved.
  • the light reaching the second protective member 20b from the member 20a may be reflected in the direction of the solar battery cell 10.
  • the sealing member 18 is provided between the first protection member 20a and the light receiving surface 12, and between the second protection member 20b and the back surface 14, respectively, and prevents moisture from entering the solar cells 10 and the like. It is a protective material that improves the overall strength of the battery module 100.
  • the 1st protection member 20a, the 1st sealing member 18a, the photovoltaic cell 10, the 2nd sealing member 18b, and the 2nd back sheet 22b are laminated
  • the sealing member 18 also has a function as a wavelength conversion filter.
  • the configuration of the sealing member 18 will be described in more detail.
  • FIG. 3 shows the configuration of the sealing member 18.
  • the sealing member 18 includes a phosphor 30, a scattering material 32, and a transparent resin 34.
  • the transparent resin 34 has transparency that can sufficiently transmit sunlight.
  • the transparent resin 34 is a resin material such as ethylene vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), polyimide, polyethylene, polypropylene, polyethylene terephthalate (PET).
  • EVA ethylene vinyl acetate copolymer
  • PVB polyvinyl butyral
  • PET polyethylene terephthalate
  • the phosphor 30 is mixed in the transparent resin 34 and converts the wavelength of light having a part of the wavelength contained in sunlight. As described above, in order to improve the photoelectric conversion efficiency of the solar battery cell 10, the phosphor 30 absorbs light in a short wavelength region where the photoelectric conversion efficiency in the solar battery cell 10 is low, and the long wavelength with high photoelectric conversion efficiency. The light of the region is emitted. More specifically, the phosphor 30 converts the wavelength of ultraviolet light to blue light of 500 nm or less from green light to near infrared light of 500 nm to 1100 nm. In particular, the phosphor 30 is efficiently excited at 300 nm or more where the sunlight spectrum intensity is relatively large. In addition, an inorganic phosphor is used for the phosphor 30 from the viewpoint of durability and moisture resistance.
  • the particle size of the phosphor 30 is several ⁇ m, the wavelength conversion efficiency is improved, but the transmittance is lowered.
  • the transmittance is reduced, reflection by the phosphor 30 generates a component of light that is reflected toward the side on which sunlight is incident without going to the solar battery cell 10.
  • the photoelectric conversion efficiency of the solar battery cell 10 is lowered.
  • the particle size of the phosphor 30 is set to several ⁇ m, and the scattering material 32 is also mixed with the transparent resin 34 in order to suppress a decrease in transmittance of 500 nm or more.
  • the scattering material 32 will be described later.
  • the particle diameters of the plurality of phosphors 30 may not be uniform, and in that case, the average particle diameter may be several ⁇ m. Since a known technique may be used for the measurement of the average particle diameter, description thereof is omitted here.
  • FIG. 4 shows an excitation spectrum and an emission spectrum of (Ba, Sr) 2 SiO 4 : Eu that is the phosphor 30.
  • the horizontal axis indicates the wavelength, and the vertical axis indicates the intensity (arbitrary unit).
  • an excitation spectrum 40 and an emission spectrum 42 are shown.
  • the excitation spectrum 40 shows a change in wavelength of the intensity of light absorbed by the phosphor 30.
  • the excitation peak P1 is the maximum intensity in the excitation spectrum 40, and the wavelength thereof is about 300 nm.
  • the excitation wavelength region 44 has a wavelength width that has an intensity that is equal to or greater than half the intensity of the excitation peak P1, and this corresponds to a half-value width with respect to the intensity of the excitation peak P1.
  • the excitation wavelength region 44 may be specified by a value different from the half value of the intensity of the excitation peak P1.
  • the excitation wavelength region 44 in FIG. 4 is defined from about 260 nm to about 490 nm.
  • the wavelength of light excited by the phosphor 30 is collectively referred to as “excitation wavelength”. Therefore, the entire excitation spectrum 40 may be specified by the excitation wavelength, a part of the excitation spectrum 40 such as the excitation wavelength region 44 may be specified, and one point in the excitation spectrum 40 such as the excitation peak P1. May be specified.
  • the emission spectrum 42 shows the wavelength change of the intensity of the light emitted from the phosphor 30.
  • the emission peak Q1 is the maximum intensity in the emission spectrum 42, and its wavelength is 540 nm.
  • the emission wavelength region 46 is defined in the same manner as the excitation wavelength region 44 with respect to the emission peak Q1.
  • the emission wavelength region 46 in FIG. 4 is defined from about 510 nm to about 570 nm.
  • the wavelength of light emitted from the phosphor 30 is collectively referred to as “emission wavelength”. Therefore, the entire emission spectrum 42 may be specified by the emission wavelength, a part of the emission spectrum 42 such as the emission wavelength region 46 may be specified, and one point in the emission spectrum 42 such as the emission peak Q1. May be specified.
  • the scattering material 32 has a grain shape.
  • the scattering material 32 scatters light while having wavelength selectivity.
  • the scattering material 32 is, for example, silicon dioxide (SiO 2 ), which is also called silica or silicic anhydride.
  • the scattering material 32 is, for example, zirconium oxide (IV) (ZrO 2 ), which is also called zirconia.
  • IV zirconium oxide
  • the scattering material 32 is SiO 2 .
  • the wavelength selectivity required for the scattering material 32 is indicated by the following two characteristics.
  • the first characteristic is that the transmittance is low at the excitation wavelength of the phosphor 30, for example, at the excitation peak P ⁇ b> 1 or the excitation wavelength region 44. This corresponds to scattering light having a wavelength of 500 nm or less when the phosphor 30 is (Ba, Sr) 2 SiO 4 : Eu. By reducing the transmittance, light of that wavelength is scattered by the scattering material 32 and is easily absorbed by the phosphor 30.
  • the second characteristic is that the transmittance is high at the emission wavelength of the phosphor 30, for example, at the emission peak Q 1 or the emission wavelength region 46.
  • the scattering material 32 scatters light having an excitation wavelength of the phosphor 30 rather than light having an emission wavelength of the phosphor 30.
  • FIGS. 5A and 5B show the scattering intensity distribution when the particle size of the scattering material 32 is 100 nm and the scattering intensity distribution in which the straight direction component is normalized to 1.
  • FIG. FIG. 5A shows the scattered intensity distribution
  • FIG. 5B shows the normalized scattered intensity distribution. These are measured in a state where SiO 2 is contained in EVA.
  • the wavelength of the light to irradiate is 350 nm, 550 nm, and 1000 nm. 350 nm is included in the excitation wavelength region 44, 550 nm is included in the emission wavelength region 46, and 1000 nm is a wavelength longer than the emission wavelength.
  • the direction dependency of the scattering intensity is low.
  • the scattering intensity at the wavelength 350 nm result 90 is the largest, the scattering intensity at the wavelength 550 nm result 92 is the next largest, and the scattering intensity at the wavelength 1000 nm result 94 is the smallest. That is, the shorter the wavelength, the greater the scattering intensity.
  • the directivity of the wavelength 350 nm result 90 is larger than the directivity of the wavelength 550 nm result 92, and the directivity of the wavelength 550 nm result 92 is larger than the directivity of the wavelength 1000 nm result 94. That is, the directivity increases as the wavelength becomes shorter. As the directivity increases, the tendency of only forward scattering increases, and when the directivity decreases, the backscatter increases.
  • FIG. 6 (a)-(b) show the scattering intensity distribution when the particle size of the scattering material 32 is 300 nm and the scattering intensity distribution in which the component in the straight direction is normalized to 1.
  • FIG. 6 (a)-(b) are shown similarly to FIGS. 5 (a)-(b). Comparing FIG. 6A and FIG. 5A, the scattering intensity is larger when the particle size of the scattering material 32 is 300 nm than when the particle size of the scattering material 32 is 100 nm. ing. Further, when FIG. 6B and FIG. 5B are compared, the wavelength-oriented direction is more when the particle size of the scattering material 32 is 300 nm than when the particle size of the scattering material 32 is 100 nm. The difference in sex is getting smaller.
  • FIG. 7 (a)-(b) show the scattering intensity distribution when the particle size of the scattering material 32 is 500 nm and the scattering intensity distribution in which the straight direction component is normalized to 1.
  • FIG. 7 (a)-(b) are also shown in the same manner as FIGS. 5 (a)-(b).
  • the scattering intensity is larger than in FIG. 6A
  • the difference in directivity depending on the wavelength is smaller than in FIG. 6B.
  • FIGS. 8A to 8B show the scattering intensity distribution when the particle diameter of the scattering material 32 is 1000 nm and the scattering intensity distribution in which the straight direction component is normalized to 1.
  • FIG. 8 (a)-(b) are also shown in the same manner as FIGS. 5 (a)-(b).
  • FIG. 8A when the particle size of the scattering material 32 is 1000 nm, the scattering intensity is maximized in this simulation.
  • FIG. 8B when the particle size of the scattering material 32 is 1000 nm, the difference in directivity due to the wavelength is minimized among the measurements made this time. From FIG. 5 (a)-(b), FIG. 6 (a)-(b), FIG. 7 (a)-(b), and FIG.
  • FIG. 9 shows the wavelength dependence of the transmittance of the sealing member 18 in which the scattering material 32 is dispersed.
  • the horizontal axis indicates the wavelength
  • the vertical axis indicates the transmittance.
  • the change in transmittance is small in all measured wavelengths, particularly in the excitation wavelength region 44 and the emission wavelength region 46.
  • the transmittance in the excitation wavelength region 44 is lower than the transmittance in the emission wavelength region 46.
  • the 100 nm scattering material 50 and the 300 nm scattering material 52 have the above-described two characteristics, and the 1000 nm scattering material 54 does not have characteristics with respect to the above-described two characteristics.
  • the 500 nm scattering material has the above-described two characteristics. Therefore, in consideration of these, the average particle diameter of the scattering material 32 should be 500 nm or less.
  • FIG. 10 shows the blending conditions of the sealing member 18.
  • four kinds of blending conditions are shown, two of which are the first pattern and the second pattern corresponding to the example, and the remaining two are the first comparative example and the second pattern for comparison with the example. It is a comparative example.
  • the conditions for the phosphor 30 and the transparent resin 34 are common, and the conditions for the scattering material 32 are all different.
  • the composition of the phosphor 30 is (Ba, Sr) 2 SiO 4 : Eu, the addition amount is 1.0% by volume, and the particle size is 16000 nm.
  • the composition of the transparent resin 34 is EVA, and the refractive index thereof is 1.48.
  • the composition of the scattering material 32 in the first pattern, the second pattern, and the second comparative example is SiO 2 and its refractive index is 1.44.
  • the amount of SiO 2 added in the first pattern is 5.0% by volume and the particle size is 100 nm
  • the amount of SiO 2 added in the second pattern is 8.0% by volume
  • the particle size is 300 nm.
  • the amount of SiO 2 added in the second comparative example is 10.0% by volume, and the particle size is 1000 nm. These correspond to the three particle sizes already compared.
  • the scattering material 32 is not mixed in the first comparative example.
  • FIG. 11 shows the wavelength dependence of the transmittance for each of the aforementioned blending conditions.
  • the horizontal axis indicates the wavelength
  • the vertical axis indicates the transmittance. Since the scattering material 32 is not mixed in the first comparative example 64, the transmittance is high over all the measured wavelengths. Therefore, the amount of light absorbed by the phosphor 30 in the excitation wavelength region 44 is reduced, and the amount of light wavelength-converted by the phosphor 30 is also reduced. As a result, there is little improvement in photoelectric conversion efficiency by the solar battery cell 10.
  • the second comparative example 66 since the scattering material 32 having no wavelength selectivity is mixed, the transmittance is low over all measured wavelengths. In particular, since the transmittance at the emission wavelength region 46 and above is reduced, the photoelectric effect by the solar battery cell 10 is also reduced.
  • the transmittance of the first pattern 60 and the second pattern 62 is reduced in the excitation wavelength region 44 as in the second comparative example 66. Therefore, the amount of light absorbed by the phosphor 30 in the excitation wavelength region 44 increases, and the amount of light that is wavelength-converted by the phosphor 30 also increases. Further, in the first pattern 60 and the second pattern 62, the transmittance is less reduced in the light emission wavelength region 46 and in the wavelength longer than that in the first comparative example 64. As a result, the photoelectric conversion efficiency by the solar battery cell 10 is improved.
  • the scattering material 32 may be made of ZrO 2 instead of SiO 2 . It is possible to mix ZrO 2 as the scattering material 32 with respect to the phosphor 30 and the transparent resin 34 under the blending conditions of FIG.
  • the refractive index of ZrO 2 is 2.2, for example, the addition amount is 0.005% by volume, and the particle size is 150 nm.
  • the difference in refractive index between SiO 2 and EVA is “0.04”, and the difference in refractive index between ZrO 2 and EVA is “1.04”. The latter has a larger difference in refractive index than the former. The greater the difference in refractive index, the easier it is for light to scatter.
  • the addition amount of the scattering material 32 is determined according to the difference between the refractive index of the scattering material 32 and the refractive index of the transparent resin 34. Specifically, the addition amount is increased as the difference is smaller.
  • the solar battery cell is improved while improving the wavelength conversion efficiency. 10 can suppress a decrease in transmittance with respect to light having a wavelength that is efficiently photoelectrically converted. Moreover, since the fall of the transmittance
  • the scattering material 32 having an average particle size of 500 nm or less since the scattering material 32 having an average particle size of 500 nm or less is used, light having a wavelength of 500 nm or less can be scattered. Moreover, since the addition amount of the scattering material 32 is increased as the difference between the refractive index of the scattering material 32 and the refractive index of the transparent resin 34 is smaller, an amount of the scattering material 32 suitable for having wavelength selectivity can be mixed. .
  • the wavelength conversion filter 18 includes a transparent resin 34, a phosphor 30 mixed with the transparent resin 34, and a phosphor 30 mixed with the transparent resin 34, rather than light having an emission wavelength of the phosphor 30. And a scattering material 32 that scatters light of the excitation wavelength.
  • the scattering material 32 may scatter light having a wavelength of 500 nm or less.
  • the scattering material 32 has a grain shape, and the average particle diameter may be 500 nm or less.
  • the addition amount of the scattering material 32 may be increased as the difference between the refractive index of the scattering material 32 and the refractive index of the transparent resin 34 is smaller.
  • This solar cell module 100 is a solar cell module 100 in which a protective member 20, a sealing member 18, and solar cells 10 are stacked.
  • the sealing member 18 is mixed with a transparent resin 34 and a transparent resin 34. It includes a phosphor 30 and a scattering material 32 that is mixed in the transparent resin 34 and scatters light having an excitation wavelength of the phosphor 30 rather than light having an emission wavelength of the phosphor 30.
  • the wavelength conversion filter in which the phosphor 30 and the scattering material 32 are mixed with the transparent resin 34 is configured as the sealing member 18.
  • the wavelength conversion filter may be provided separately from the sealing member 18. If demonstrating it concretely, the wavelength conversion filter may be arrange
  • the wavelength conversion filter may be disposed between the back surface 14 of the solar battery cell 10 and the second sealing member 18b.
  • the wavelength conversion filter may be attached to the light receiving side of the first protective member 20a.
  • the wavelength conversion filter may be disposed between the first protective member 20a and the first sealing member 18a.
  • the wavelength conversion filter may be disposed between the second protective member 20b and the second sealing member 18b. According to this modification, the degree of freedom of configuration can be improved.
  • the present invention it is possible to suppress a decrease in transmittance while converting light having an unusable wavelength into light having a usable wavelength.

Abstract

En tant que filtre de conversion de longueur d'onde, un élément d'étanchéité 18 comprend une résine transparente 34 ayant une transparence capable d'émettre de manière appropriée de la lumière solaire. Un corps fluorescent 30 est mélangé avec la résine transparente 34, absorbe une lumière d'une longueur d'onde d'excitation dans la lumière solaire, et délivre une lumière d'une longueur d'onde d'émission. Un matériau de diffusion de lumière 32 est également mélangé avec la résine transparente 34 et diffuse une lumière de la longueur d'onde d'excitation du corps fluorescent 30 plus que la lumière de la longueur d'onde d'émission du corps fluorescent 30.
PCT/JP2015/004395 2014-09-01 2015-08-31 Filtre de conversion de longueur d'onde et module de cellule solaire l'utilisant WO2016035311A1 (fr)

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