JP2007027271A - Solar power generation module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar power generation module that can utilize the power generation of ultraviolet rays effectively, suppresses the deterioration of each member, has a long power generation lifetime, and requires low maintenance costs. <P>SOLUTION: A laminar solar battery cell 13 is adhered to the rear side of a transparent glass substrate 11 arranged at the front side where solar light enters via an adhesive polymer layer 12. Ce<SP>3+</SP>is doped into the glass substrate 11 as a photoactive ion 15 as an ultraviolet ray-visible light conversion substance. Ultraviolet rays are absorbed by the photoactive ion 15 in the glass substrate 11 to output visible light, thus preventing the adhesive polymer layer 12 from being exposed to ultraviolet rays and suppressing deterioration. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a photovoltaic power generation module, and more particularly to a photovoltaic power generation module that can effectively use ultraviolet light for power generation and can suppress deterioration of members due to ultraviolet light.

  As a photovoltaic power generation module, a plurality of solar cell elements (photoelectric conversion layers) provided with electrodes on both sides are connected in series, these photoelectric conversion layers are attached to a back film, and a glass plate is arranged on the front side. It is known (for example, refer nonpatent literature 1). As a structure of such a photovoltaic power generation module, a super straight type, a substrate type, and a glass package type are known (see, for example, Non-Patent Document 2 and Non-Patent Document 3). Other solar power generation modules include a dye-sensitized solar cell module and an organic semiconductor thin film solar cell module.

  However, in the various photovoltaic power generation modules described above, there is a portion that deteriorates due to ultraviolet rays, and therefore, measures for removing ultraviolet rays have been considered in order to avoid the deterioration.

  The super straight type photovoltaic power generation module described above has a structure of cover glass / adhesive filler (adhesive polymer) layer / solar cell layer / adhesive polymer layer / aluminum package in order from the front side. As the adhesive filler, EVA (ethylene vinyl acetate), PVB (polyvinyl butyral), or the like is used. The intramolecular binding energy of these organic resins is smaller than the ultraviolet rays (wavelength is 300 to 400 nm) contained in sunlight. Therefore, as a result of molecular decomposition of these organic resins by ultraviolet rays or reaction (photochemical reaction) with oxygen or moisture in the air, the transmittance in the visible light region and the infrared region is reduced (devitrification) and sunlight. Reduces power generation. In order to solve such a problem, measures have been taken to periodically replace the adhesive filler or block ultraviolet rays.

  Photovoltaic modules using polycrystalline silicon and single crystal silicon, which occupy most of the solar cell materials, have a very large refractive index in the ultraviolet region of silicon, and are far from the junction surface (carriers do not drift due to the internal electric field) Since the absorption in the vicinity of (region) is large, the surface reflection loss (40% or more) and the surface recombination loss are very large and hardly contribute to solar power generation.

Therefore, (a) heavy metal ions (cerium (Ce)) are doped in the cover glass, and by Ce ⁴⁺ , specifically, charge transfer transition between oxygen ions and Ce ⁴⁺ ions (O ²⁻ (2p) Ce ⁴⁺ (4f)), a method that selectively absorbs only ultraviolet rays and converts them into heat, (b) a method that mixes organic molecules of UV absorbers in an adhesive polymer and absorbs ultraviolet rays, and converts them into heat; Methods have been proposed in which an antioxidant is added to the polymer to suppress the photochemical reaction.

  However, since the methods (b) and (c) are both methods for putting organic molecules, the photochemical reaction between the put organic molecules and the adhesive polymer proceeds and eventually deterioration occurs. Further, although the method (A) can effectively block ultraviolet rays, the ultraviolet rays are not used for power generation but only become heat.

  Moreover, in a solar power generation module using amorphous silicon (α-Si: H) as a solar cell material, a super straight type in which α-Si: H is bonded to a glass plate via an adhesive polymer; There is a substrate type in which α-Si: H is directly deposited on a glass plate. In the super straight type photovoltaic power generation module, as described above, since the deterioration of the adhesive filler due to ultraviolet rays becomes a problem, it is necessary to take measures against ultraviolet rays. On the other hand, α-Si: H (pin structure) that generates electricity by the photovoltaic effect is difficult to function as an electronic device because it contains many lattice defects and non-bonding hands. However, non-bonding hands and hydrogen (H) exist. As a result of the relatively low defect density due to bonding, it functions as an electronic device. However, due to the light-induced property deterioration phenomenon (Staebler-Wronski effect), when irradiated with light, the Si-H bond is separated, and the original α-Si with many non-bonded hands (defects) is restored. As a result, it is known that the solar cell (electronic device) does not function (power generation), which is a great barrier to the reliability and spread of amorphous silicon photovoltaic modules. In particular, ultraviolet rays with high energy have energy that sufficiently separates the bond between Si and H. Therefore, it is necessary to take measures against ultraviolet rays even in the substrate type solar power generation module.

The dye-sensitized solar power generation module has attracted attention as a next-generation solar cell from the viewpoint of low cost and high degree of freedom in form. The structure, on the conductivity of the transparent electrode a transparent electrode of a glass substrate deposited, electrons of TiO ₂ porous deposited as a layer for collecting the absorption of sunlight into the porous TiO ₂ on the surface of After adsorbing the dye (ruthenium complex) to be collected, injecting an electrolyte containing an iodine reduction system to collect holes and sandwiching it with a glass substrate with a back electrode, sealed with polymers to prevent leakage of the electrolyte It is a stopped structure. Since ultraviolet rays have energy that sufficiently dissociates the intramolecular bonds of the sensitizing dye, the ultraviolet rays are easily decomposed and deteriorated. Furthermore, there is a concern that TiO ₂ having a photocatalytic function used for electron collection may decompose organic sensitizing dyes (complexes) when irradiated with ultraviolet rays having a band gap energy or higher (3.2 eV, wavelength 380 nm or shorter). Is done. In order to prevent deterioration due to ultraviolet irradiation, there are a method of doping a glass substrate with ultraviolet absorbing ions to absorb and block only ultraviolet rays, a method of reflecting ultraviolet rays by utilizing the high reflectivity of the transparent electrode, etc. It is considered. However, either method is a method of blocking intrusion without using ultraviolet rays for power generation.

Similar to the dye-sensitized solar power generation module, the organic semiconductor thin-film solar power generation module has attracted attention as a next-generation solar cell from the viewpoint of low cost and high degree of freedom in form. This organic semiconductor thin-film photovoltaic module has a structure in which an ITO (Indium Tin Oxide) film is deposited on a glass substrate as a transparent electrode, absorbs sunlight on the glass substrate, generates carriers, and generates organic carriers (phthalocyanine-based). the C ₆₀ is a hybrid structure. However, since organic molecules having a binding energy smaller than that of ultraviolet rays are used as a carrier generation and transport layer, when these layers are irradiated with ultraviolet rays, deterioration due to ultraviolet irradiation is inevitable. In this organic semiconductor thin-film photovoltaic module, since the ultraviolet rays are almost reflected by the ITO film, the ultraviolet rays do not reach the organic semiconductor layer.

  In the various types of solar power generation modules described above, in order to avoid deterioration of organic matter and a portion having low binding energy due to ultraviolet rays, the ultraviolet rays are removed without being used for power generation.

  However, in the above-mentioned various photovoltaic power generation modules, since ultraviolet rays are not used for power generation, the power generation amount per unit module is low, and in order to obtain a desired power generation amount, for example, the number of solar power generation modules can be increased, It was necessary to increase the light receiving area.

As another conventional technique, a solar cell cover sheet disposed on the surface of a solar cell is known in which a transparent resin sheet is blended with a fluorescent material having a wavelength conversion function (see, for example, Patent Document 1). However, since the sheet | seat which mix | blends a fluorescent substance is resin, there exists a problem that this sheet | seat itself deteriorates with an ultraviolet-ray.
Edited by Makoto Konagai, "Basics and Applications of Thin Film Solar Cells", Ohm Co., Ltd., 1st Edition, March 20, 2001, page 41, Fig. 2-17 Kuwano Yukinori, “Solar Energy Optics”, Baifukan Co., Ltd., September 20, 1997, page 229, Fig. 5.6 Edited by Kiyoshi Takahashi, Akihiro Hamakawa, Akio Gokawa, Morikawa Publishing Co., Ltd., February 20, 1980, pp. 322-323, FIGS. JP 2001-352091 (first page)

  Therefore, an object of the present invention is to provide a solar power generation module that can effectively use ultraviolet rays for power generation.

  Another object of the present invention is to provide a photovoltaic power generation module that suppresses deterioration of each member and has a long power generation life and low maintenance cost.

  A first feature of the present invention is a solar power generation module in which solar cells are bonded to the rear surface side of a transparent glass substrate via an adhesive polymer, and ultraviolet light is visible on the front side of the solar cells. The gist is that an ultraviolet-visible light converting substance for wavelength conversion is provided.

  In the invention according to the first feature, the ultraviolet-visible light converting substance is preferably contained in the glass substrate or the adhesive polymer, or formed in a film shape on the front surface or the rear surface of the glass substrate. preferable.

  A second feature of the present invention is a photovoltaic power generation module in which solar cells are bonded to the rear surface of a transparent glass substrate, and an ultraviolet-visible light converting substance that converts wavelength of ultraviolet light into visible light in the glass substrate. Is included.

  A third feature of the present invention is a photovoltaic power generation module in which solar cells are bonded to the rear surface of a transparent glass substrate, and an ultraviolet-visible light conversion substance is formed in a film shape on the front surface or rear surface of the glass substrate. It is a summary.

  According to the present invention, it is possible to increase the power generation efficiency by effectively using ultraviolet rays for power generation.

  Moreover, according to the present invention, it is possible to provide a photovoltaic power generation module having a long power generation life and low maintenance cost.

  Hereinafter, the details of the photovoltaic power generation module according to the embodiment of the present invention will be described based on the drawings. However, it should be noted that the drawings are schematic and the thicknesses and ratios of the material layers are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[First Embodiment]
A photovoltaic power generation module 10 according to the first embodiment of the present invention will be described with reference to FIG. This photovoltaic power generation module 10 is a so-called super straight type module.

  As shown in FIG. 1, the photovoltaic module 10 has a layered solar cell 13 bonded to a rear surface side of a transparent glass substrate 11 disposed on the front surface side where sunlight enters through an adhesive polymer layer 12. In general, it is structured. In addition, although the solar cell 13 is provided with electrodes on the front and rear surfaces, only the front surface electrode 14 is shown in FIG.

  As the adhesive polymer layer 12, EVA (ethylene vinyl acetate), PVB (polyvinyl butyral), or the like is used. In addition, the intramolecular binding energy of these organic resins is smaller than the ultraviolet rays contained in sunlight.

  Moreover, as the solar cell 13, the single crystal silicon solar cell, the polycrystalline silicon solar cell, the amorphous silicon solar cell, the dye-sensitized solar cell, the organic semiconductor thin film solar cell, the compound semiconductor single crystal solar cell, the compound semiconductor multi-layer Various types of solar cells such as crystalline solar cells can be applied.

In particular, in the present embodiment, the glass substrate 11 is doped with photoactive ions 15 as an ultraviolet-visible light converting substance. In the present embodiment, Ce ³⁺ is doped as the photoactive ion 15. In addition, in order to dope Ce ³⁺ as trivalent ions stably into the glass substrate 11, (Gd 2 O 3 —BaO :) is blended in the composition of the borosilicate glass. Further, as the glass substrate 11, in addition to borosilicate glass, existing oxide glass, soda lime glass, or the like can be used.

The characteristics of the glass substrate 11 doped with Ce ³⁺ (B ₂ O ₃ —SiO ₂ —Gd ₂ O ₃ —BaO: Ce ³⁺ ) are as follows.

Form: Glass absorption wavelength λex; 275-450 nm
Peak wavelength: 350 nm
Fluorescence wavelength λem; 400-500 nm
Peak wavelength: 450nm
Most of the components of the B ₂ O ₃ —SiO ₂ —Gd ₂ O ₃ —BaO: Ce ³⁺ are the same as those of the glass substrate 11 as the cover glass, and the glass substrate 11 is doped with the photoactive ions 15. As a result, it is possible to reduce material investment and energy investment.

  In the photovoltaic power generation module 10 according to the present embodiment, as shown in FIG. 1, visible light (wavelength band 400 to 700 nm) and infrared region (wavelength band 700 to 1200 nm: used for power generation are generated by a solar cell). Possible region) passes through the glass substrate 11 in the same manner as ordinary glass, and enters the solar battery cell 13 through the adhesive polymer layer 12. On the other hand, ultraviolet rays (wavelength band: 300 to 400 nm) are absorbed by the photoactive ions 15 doped in the glass substrate 11, converted into visible light, and then passed through the adhesive polymer layer 12 to form solar cells 13. Incident.

  As described above, the adhesive polymer layer 12 having an intramolecular bond energy smaller than that of ultraviolet rays is not irradiated with ultraviolet rays, and visible light and light in the infrared region are transmitted, so that deterioration due to ultraviolet rays is suppressed. In addition, since the bond dissociation energy between C, H, and O constituting the organic resin is larger than the energy of visible light (wavelength of 400 or more), theoretically, degradation due to visible light does not occur.

  As described above, in this embodiment, since the deterioration of the adhesive polymer layer 12 is suppressed, the life of the photovoltaic power generation module 10 can be extended, and the maintenance burden can be reduced.

  In the photovoltaic power generation module 10 according to the present embodiment, since the ultraviolet rays can be converted into visible light and used for power generation, the power generation amount per unit area can be increased.

  In the photovoltaic power generation module 10 according to the present embodiment, a part (20% or less) of visible light emitted by converting the wavelength of ultraviolet rays by the photoactive ions 15 is radiated from the front surface of the glass substrate 11 to the air layer. Therefore, a module configuration that is colorful in appearance can be realized. As described above, a part of visible light emitted from the photoactive ions 15 is radiated to the air layer and the amount of visible light incident on the solar cell 13 is reduced. 12 and the solar cell 13 are prevented from entering, and as a result, the amount of visible light incident on the solar cell 13 is significantly increased.

  In the solar power generation module 10 according to the present embodiment, the incident probability (fluorescence collection rate) of the converted visible light to the solar battery cell 13 does not greatly depend on the incident angle of sunlight, and a certain ratio (83 %), The incident angle of sunlight increases, and when most of visible light and infrared light are reflected, the relative effect of converting ultraviolet light into visible light increases.

  Further, in a normal solar battery system, the surface electrode provided on the front surface of the solar battery cell reflects a part of the incident sunlight, resulting in a shielding loss. In the power generation module 10, the photoactive ions 15 absorb ultraviolet rays, convert them into visible light, and disperse the visible light. Therefore, the photovoltaic cells 13 pass through a region between the surface electrodes 14 made of, for example, ITO or the like. The amount of light reaching the center is large and does not receive much shielding loss.

  In the photovoltaic power generation module 10 according to the present embodiment, the ultraviolet-visible light conversion efficiency is further increased in the universe where the amount of ultraviolet rays for visible light and infrared rays is more abundant than the ground.

In this embodiment, B ₂ O ₃ —SiO ₂ —Gd ₂ O ₃ —BaO: Ce ³⁺ is used as the glass substrate 11 doped with the photoactive ions 15, but other photoactive ions are selected. Therefore, the present invention is not limited to only ultraviolet rays, but can be applied to relatively increase the amount of power generation by converting light in a low spectral sensitivity region of a solar cell into a high spectral sensitivity region.

[Second Embodiment]
Next, the solar power generation module 20 according to the second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same parts as those of the photovoltaic power generation module 10 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The photovoltaic power generation module 20 of the present embodiment is a so-called super straight type module. As shown in FIG. 2, the photovoltaic power generation module 20 according to the present embodiment has a layered structure on the rear surface side of a transparent glass substrate 11 disposed on the front surface side where sunlight enters through an adhesive polymer layer 12. The configuration is substantially the same as that of the solar power generation module 10 of the first embodiment in that the solar cells 13 are bonded and generally configured.

  In the present embodiment, electrodes are provided on the front and rear surfaces of the solar battery cell 13 but are not shown. Moreover, as the solar cell 13, the single crystal silicon solar cell, the polycrystalline silicon solar cell, the amorphous silicon solar cell, the dye-sensitized solar cell, the organic semiconductor thin film solar cell, the compound semiconductor single crystal solar cell, the compound semiconductor multi-layer Various types of solar cells such as crystalline solar cells can be applied.

  The photovoltaic power generation module 20 according to the present embodiment is characterized in that the photovoltaic power generation module 10 according to the first embodiment is doped with photoactive ions as an ultraviolet-visible light conversion substance, whereas a phosphor. This is the point that the fine particles 16 are mixed in the glass substrate 11.

  As the phosphor fine particles 16, fine particles of a substance represented by the following general formulas (A) to (G) can be used. Although (A) is also included in the glass substrate 11 of the solar power generation module 10 according to the first embodiment, it is mixed as fine phosphor particles 16 in the present embodiment.

_{(A) B 2 O 3 -SiO} 2 -Gd 2 O 3 -BaO: Ce 3+
Form: Glass absorption wavelength λex; 275-450 nm
Peak wavelength: 350 nm
Fluorescence wavelength λem; 400-500 nm
Peak wavelength: 450nm
Characteristics: Most of the phosphors are the same as the components of the glass substrate (cover glass).

(B) CaF ₂ : Eu ²⁺ or SrF ₂ : Eu ²⁺
Form: It can take the form of a film, fine particles, compressed glass, a composite with glass, a composite with polymer, and the like.

Absorption wavelength λex; 300 nm or less to 420 nm
Peak wavelength: 335 nm
Fluorescence wavelength λem; 400-500 nm
Peak wavelength: 425 nm
Characteristic: It has a degree of freedom in manufacturing forms such as thin film deposition by vacuum evaporation, dispersion of fine particles, and composite. Eu, which is a photoactive ion, is slightly expensive, but has a very high absorption coefficient (strong absorption), so that it is possible to absorb ultraviolet rays even in a small amount (10 ⁻⁵ mol or less / cm ² to 0.5 mg or less / cm ² ).

(C) MgF ₂ : Eu ²⁺
Form: It can take the form of a film, fine particles, compressed glass, a composite with glass, a composite with polymer, and the like.

Absorption wavelength λex; 300 nm to 400 nm
Peak wavelength: 320 nm
Fluorescence wavelength λem; 400 to 550 nm
Peak wavelength: 440 nm
Characteristic: It has a degree of freedom in manufacturing forms such as thin film deposition by vacuum evaporation, dispersion of fine particles, and composite. Eu, which is a photoactive ion, is slightly expensive, but has a very high absorption coefficient (strong absorption), so that it is possible to absorb ultraviolet rays even in a small amount (10 ⁻⁵ mol or less / cm ² to 0.5 mg or less / cm ² ).

(D) SrO.Al ₂ O ₃ : Eu ²⁺
Form: Ceramic absorption wavelength λex; 200 nm to 450 nm
Peak wavelength: 254 nm
Fluorescence wavelength λem; 450-650 nm
Peak wavelength: 516 nm
Features: Dispersion is possible during glass substrate (cover glass) production. Since the main component is a component constituting most oxide glasses, the investment in the material may be small.

(E) 1.29 (Ba, Ca) O.6Al ₂ O ₃ : Eu ²⁺ , or 0.82BaO · 6Al ₂ O ₃ : Eu ²⁺
Form: Ceramic absorption wavelength λex; 200 nm to 400 nm
Peak wavelength: 254 nm
Fluorescence wavelength λem; 400-600 nm
Peak wavelength: 440 nm
Features: Dispersion is possible during glass substrate (cover glass) production. Since the main component is a component constituting most oxide glasses, the investment in the material may be small.

(F) BaAl ₂ O ₄ : Eu ²⁺
Form: Ceramic absorption wavelength λex; 200 nm to 400 nm
Peak wavelength: 254 nm
Fluorescence wavelength λem; 400-600 nm
Peak wavelength: 440 nm
Features: Dispersion is possible during glass substrate (cover glass) production. Since the main component is a component constituting most oxide glasses, the investment in the material may be small.

(G) MgF ₂ : Yb ²⁺
Form: It can take the form of a film, fine particles, compressed glass, a composite with glass, a composite with polymer, and the like.

Absorption wavelength λex; 200 nm to 420 nm
Peak wavelength: 335 nm
Fluorescence wavelength λem; 400-600 nm
Peak wavelength: 440 nm
Characteristic: It has a degree of freedom in manufacturing forms such as thin film deposition by vacuum evaporation, dispersion of fine particles, and composite. Yb which is a photoactive ion is considerably cheaper than Eu.

  Also in the solar power generation module 20 according to the second embodiment, it is possible to obtain the same operations and effects as those in the first embodiment.

[Third Embodiment]
Next, a solar power generation module 30 according to a third embodiment of the present invention will be described using FIG. In the present embodiment, the same parts as those of the photovoltaic power generation module 10 of the first embodiment shown in FIG.

  The photovoltaic power generation module 30 according to the present embodiment is a so-called super straight type module. As shown in FIG. 3, the photovoltaic module 30 includes an inorganic fluorescent film 17 formed on the front side of a transparent glass substrate 11 on which sunlight enters, and an adhesive polymer layer 12 on the rear side of the glass substrate 11. Layered solar cells 13 are bonded to each other and are roughly configured. Although not shown, electrodes are provided on the front and rear surfaces of the solar battery cell 13 also in the present embodiment. Moreover, as the solar cell 13, the single crystal silicon solar cell, the polycrystalline silicon solar cell, the amorphous silicon solar cell, the dye-sensitized solar cell, the organic semiconductor thin film solar cell, the compound semiconductor single crystal solar cell, the compound semiconductor multi-layer Various types of solar cells such as crystalline solar cells can be applied.

The inorganic fluorescent film 17 is the (A) to (G) listed in the second embodiment, that is, (A) B ₂ O ₃ —SiO ₂ —Gd ₂ O ₃ —BaO: Ce ³⁺ , (B ) CaF ₂ : Eu ²⁺ or SrF ₂ : Eu ²⁺ , (C) MgF ₂ : Eu ²⁺ , (D) SrO · Al ₂ O ₃ : Eu ²⁺ , (E) 1.29 (Ba, Ca) O · 6Al ₂ O ₃ : Eu ²⁺ or 0.82BaO.6Al ₂ O ₃ : Eu ²⁺ , (F) BaAl ₂ O ₄ : Eu ²⁺ , (G) MgF ₂ : Yb ^2+, etc.

  The inorganic fluorescent film 17 can be regarded as the same body as the glass substrate 11 by selecting one having a refractive index comparable to that of the glass substrate 11 and prevents unnecessary reflection at the interface between the two. can do.

  In the photovoltaic power generation module 30 according to the present embodiment, as shown in FIG. 3, the ultraviolet light (wavelength: 300 to 400 nm) component of incident sunlight is absorbed by the inorganic fluorescent film 17 and visible light (wavelength: 400). (˜700 nm) and emitted. Visible light emitted from the inorganic fluorescent film 17 enters the solar battery cell 13 through the glass substrate 11 and the adhesive polymer layer 12 and is used as power generation energy.

  Of the visible light emitted from the inorganic fluorescent film 17, the light directed toward the front surface is reflected at the interface between the front surface of the inorganic fluorescent film 17 and the air layer according to the incident angle to the air layer and is directed to the solar cell 13 side. There are light that travels and light that passes through the interface and is emitted to the air layer side. If the light reflected and returned from this interface is included, most of the ultraviolet light incident on the inorganic fluorescent film 17 can enter the solar battery cell 13. In addition, since the light radiate | emitted from the said interface to the air layer side is visible light, the surface of the photovoltaic power generation module 30 is observed as a colorful color. For this reason, it can be set as the photovoltaic power generation module 30 with the beautiful external appearance instead of the black system color like the surface of the conventional photovoltaic power generation module.

  In the solar power generation module 30 described above, since the inorganic phosphor film 17 is a high-density phosphor, the ultraviolet-visible light conversion efficiency can be increased. Moreover, in this Embodiment, since the inorganic fluorescent film 17 should just be formed in the front surface of the glass substrate 11, there exists an advantage that it can apply to an existing photovoltaic power generation module as it is.

  In addition, since the other effect | action and effect of the photovoltaic power generation module 30 which concern on this Embodiment are the same as that of above-mentioned 1st Embodiment, the description is abbreviate | omitted.

[Fourth Embodiment]
Next, a solar power generation module 40 according to a fourth embodiment of the present invention will be described using FIG. Also in the present embodiment, the same parts as those of the solar power generation module 10 of the first embodiment shown in FIG.

  The photovoltaic power generation module 40 of the present embodiment is a so-called super straight type module. As shown in FIG. 4, in the solar power generation module 40 according to the present embodiment, the inorganic fluorescent film 18 is formed on the rear surface side of the transparent glass substrate 11 on which sunlight enters, and the rear surface side of the inorganic fluorescent film 18. The layered solar cells 13 are bonded to each other through the adhesive polymer layer 12. Although not shown, electrodes are provided on the front and rear surfaces of the solar battery cell 13 also in the present embodiment. Moreover, as the solar cell 13, the single crystal silicon solar cell, the polycrystalline silicon solar cell, the amorphous silicon solar cell, the dye-sensitized solar cell, the organic semiconductor thin film solar cell, the compound semiconductor single crystal solar cell, the compound semiconductor multi-layer Various types of solar cells such as crystalline solar cells can be applied.

The inorganic fluorescent film 18 of the present embodiment is the (A) to (G) listed in the second embodiment, that is, (A) B ₂ O ₃ —SiO ₂ —Gd ₂ O ₃ —BaO: Ce. ³⁺ , (B) CaF ₂ : Eu ²⁺ or SrF ₂ : Eu ²⁺ , (C) MgF ₂ : Eu ²⁺ , (D) SrO · Al ₂ O ₃ : Eu ²⁺ , (E) 1.29 (Ba, Ca) O.6Al ₂ O ₃ : Eu ²⁺ or 0.82BaO.6Al ₂ O ₃ : Eu ²⁺ , (F) BaAl ₂ O ₄ : Eu ²⁺ , (G) MgF ₂ : Yb ^2+, etc.

  In addition, the inorganic fluorescent film 18 can be regarded as the same body as the adhesive polymer layer 12 by selecting one having a refractive index equivalent to that of the adhesive polymer layer 12, and can prevent unnecessary reflection at the interface between the two. it can.

  In this solar power generation module 40, by forming the inorganic fluorescent film 18 on the rear surface side of the glass substrate 11, the ultraviolet light that has passed through the glass substrate 11 and entered the inorganic fluorescent film 18 is converted into visible light, and the solar battery cell. 13 is incident. Most of the visible light converted from ultraviolet rays by the inorganic fluorescent film 18 is incident on the solar battery cell 13. Further, although there is visible light from the inorganic fluorescent film 18 toward the glass substrate 11, visible light reflected at the interface between the inorganic fluorescent film 18 and the glass substrate 11 and reflected toward the solar battery cell 13, There is also visible light that is reflected at the interface with the air layer and travels toward the solar cell 13 side. For this reason, the photovoltaic power generation module 40 according to the present embodiment has high power generation utilization efficiency of visible light converted by the inorganic fluorescent film 18.

  Other operations and effects in the present embodiment are the same as those in the first embodiment, and thus the description thereof is omitted.

[Fifth Embodiment]
Next, a solar power generation module 50 according to the fifth embodiment of the present invention will be described with reference to FIG. Also in the present embodiment, the same parts as those of the solar power generation module 10 of the first embodiment shown in FIG.

  The photovoltaic power generation module 50 of the present embodiment is a so-called super straight type module. As shown in FIG. 5, in the photovoltaic power generation module 50 according to the present embodiment, the layered solar battery cell 13 is bonded to the rear surface of the transparent glass substrate 11 on which sunlight enters through the adhesive polymer layer 12. ing. Although not shown, electrodes are provided on the front and rear surfaces of the solar battery cell 13 also in the present embodiment. As the solar battery cell 13, various solar battery cells such as a single crystal silicon solar battery, a polycrystalline silicon solar battery, an amorphous silicon solar battery, and a compound semiconductor single crystal solar battery can be applied.

In the adhesive polymer layer 12, phosphor fine particles 19 are dispersed and arranged. The phosphor fine particles 19 of the present embodiment are (A) to (G) listed in the second embodiment, that is, (A) B ₂ O ₃ —SiO ₂ —Gd ₂ O ₃ —BaO: Ce. ³⁺ , (B) CaF ₂ : Eu ²⁺ or SrF ₂ : Eu ²⁺ , (C) MgF ₂ : Eu ²⁺ , (D) SrO · Al ₂ O ₃ : Eu ²⁺ , (E) 1.29 (Ba, Ca) O.6Al ₂ O ₃ : Eu ²⁺ or 0.82BaO.6Al ₂ O ₃ : Eu ²⁺ , (F) BaAl ₂ O ₄ : Eu ²⁺ , (G) MgF ₂ : Yb ^2+, etc.

  In addition, it is preferable to select a material having the same refractive index as that of the adhesive polymer layer 12 as the phosphor fine particles 19.

  The operations and effects of the photovoltaic power generation module 50 according to the present embodiment are substantially the same as those of the first embodiment.

(Other embodiments)
It should not be understood that the descriptions and drawings which form part of the disclosure of the above-described embodiments limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the above-described first to fifth embodiments, the present invention is applied to a super straight type solar power generation module, but a so-called substrate type solar as shown in FIGS. The present invention may be applied to a photovoltaic module.

  A solar power generation module 60 shown in FIG. 6 is obtained by forming solar cells 13 directly on the rear surface of a glass substrate 11, and phosphor fine particles 16 similar to those in the second embodiment described above are formed in the glass substrate 11. Is a distributed configuration.

  The solar power generation module 70 shown in FIG. 7 has a configuration in which the inorganic fluorescent film 17 is formed on the front surface side of the glass substrate 11 and the solar cells 13 are directly formed on the rear surface of the glass substrate 11.

  The solar power generation module 80 shown in FIG. 8 has a configuration in which the inorganic fluorescent film 18 is formed on the rear surface of the glass substrate 11 and the solar battery cell 13 is formed on the rear surface of the inorganic fluorescent film 18.

  In the substrate type photovoltaic power generation modules 60, 70, 80 as shown in FIGS. 6 to 8, since there is no adhesive polymer layer, there is no effect of preventing deterioration of the adhesive polymer layer, but UV-visible. The effect of improving the power generation efficiency is achieved by the ultraviolet-visible light conversion action of the phosphor fine particles 16 as the light conversion substance and the inorganic fluorescent films 17 and 18.

  In addition, as the photovoltaic cell 13 of the photovoltaic power generation modules 60, 70, and 80 shown in FIGS. 6 to 8, various photovoltaic cells such as an amorphous silicon solar cell and an organic semiconductor thin film solar cell can be applied.

It is a section explanatory view of a super straight type photovoltaic power generation module concerning a 1st embodiment of the present invention. It is a section explanatory view of a super straight type photovoltaic power generation module concerning a 2nd embodiment of the present invention. It is a section explanatory view of a super straight type photovoltaic power generation module concerning a 3rd embodiment of the present invention. It is a section explanatory view of a super straight type photovoltaic power generation module concerning a 4th embodiment of the present invention. It is a section explanatory view of a super straight type photovoltaic power generation module concerning a 5th embodiment of the present invention. It is a section explanatory view of a substrate type photovoltaic power generation module concerning other embodiments of the present invention. It is a section explanatory view of a substrate type photovoltaic power generation module concerning other embodiments of the present invention. It is a section explanatory view of a substrate type photovoltaic power generation module concerning other embodiments of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Solar power generation module 11 Glass substrate 12 Adhesive polymer layer 13 Solar cell 14 Surface electrode 15 Photoactive ion 16 Phosphor fine particle 17 Inorganic fluorescent film 18 Inorganic fluorescent film 19 Phosphor fine particle 20, 30, 40, 50, 60, 70 , 80 PV module

Claims (7)

A photovoltaic module in which solar cells are bonded to the rear surface side of a transparent glass substrate via an adhesive polymer,
An ultraviolet-visible light converting substance for converting the wavelength of ultraviolet light into visible light is disposed on the front side of the solar battery cell. The solar power generation module according to claim 1,
The solar power generation module, wherein the ultraviolet-visible light converting substance is contained in the glass substrate. The solar power generation module according to claim 1,
The photovoltaic module according to claim 1, wherein the ultraviolet-visible light converting substance is contained in the adhesive polymer. The solar power generation module according to claim 1,
The photovoltaic module according to claim 1, wherein the ultraviolet-visible light converting substance is formed into a film on the front surface or the rear surface of the glass substrate. It is a photovoltaic power generation module according to any one of claims 1 to 4,
The solar power generation module, wherein the ultraviolet-visible light converting substance is trivalent cerium ion (Ce ³⁺ ). A photovoltaic power generation module in which solar cells are joined to the rear surface of a transparent glass substrate,
An ultraviolet-visible light converting substance for converting the wavelength of ultraviolet light into visible light is contained in the glass substrate. A photovoltaic power generation module in which solar cells are joined to the rear surface of a transparent glass substrate,
An ultraviolet-visible light converting substance is formed in a film shape on the front surface or the rear surface of the glass substrate.

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