JP2011181814A - Sealing material sheet having wavelength conversion material and solar cell using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the photoelectric conversion efficiency of a solar cell. <P>SOLUTION: A solar cell module includes front glass 2, a sealing material 3, a solar cell 4 and a back sheet 5. A phosphor 7 emitting green light to near infrared light by being excited by near ultraviolet light to blue light is mixed in the sealing material 3. An excitation band exists in 300 nm or longer in the phosphor 7 and an excitation edge wavelength on a long wavelength side exists in 410 to 600 nm. The phosphor 7 is a compound whose parent material is expressed by MMgAl<SB>10</SB>O<SB>17</SB>:Eu, Mn. M is one kind or a plurality of kinds of elements selected from Ba, Sr and Ca. Since the structure has high wavelength conversion efficiency, the photoelectric conversion efficiency of the solar cell can be improved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technology for wavelength conversion materials, and more particularly, to a technology for improving the efficiency of a solar cell by irradiating a phosphor with near ultraviolet light to blue light and exciting it to cause light emission to perform wavelength conversion.

  The quantum efficiency of a solar cell is generally lower in the ultraviolet light to blue light region than in the green light to near infrared light region. Therefore, among the wavelength components of the light reaching the solar cell, the wavelength of the ultraviolet light to the blue light is converted into the light of the green light to the near infrared light, so that Increasing the light can improve the efficiency of the solar cell. Conventionally, it is known that the efficiency of a solar cell is improved by installing a wavelength conversion film in a path through which light reaches the solar cell.

  For example, in [Patent Document 1], a fluorescent colorant is used as a wavelength conversion material. [Patent Document 2] uses a rare earth complex-containing ORMOSIL composite. In [Non-Patent Document 1], an organometallic complex is used. However, since the above-mentioned fluorescent colorant and organometallic complex have insufficient durability, it is difficult to maintain the function as a wavelength conversion material for solar cells over a long period of time. Another problem is that the wavelength conversion quantum efficiency of the organometallic complex is as low as about 0.6 [Non-Patent Document 1]. [Patent Document 3] describes a wavelength conversion material for a solar cell using a phosphor, but [Patent Document 3] does not describe a specific numerical value for improving efficiency, [Patent Document 3]. 4] However, the effect of improving the power generation efficiency is not sufficient.

JP 2001-7377 A JP 2000-327715 A JP 2003-218379 A JP-A-7-202243

58th Coordination Chemistry Conference Proceedings 1PF-011

  When using an organometallic complex for a wavelength conversion material for a solar cell, it is a problem to improve its durability. Another problem is that the quantum efficiency of wavelength conversion of the organometallic complex is as low as about 0.6. Therefore, efforts have been made to use phosphors that are inorganic compounds as wavelength conversion materials for solar cells. However, the wavelength conversion efficiency of the conventional wavelength conversion material has not sufficiently improved the photoelectric conversion efficiency of the solar cell, and further improvement of the photoelectric conversion efficiency is required.

  This invention is made | formed in view of the said subject, The objective is to provide the structure which can improve the wavelength conversion efficiency of a wavelength conversion material, and can improve the photoelectric conversion efficiency of a solar cell.

  Of the inventions disclosed in the present application, the outline of typical ones will be briefly described as follows.

That is, the solar cell module in one embodiment of the present invention has a front glass, a transparent resin, a solar cell, and a back sheet. The front glass is a semi-tempered glass for solar cells and may have an antireflection film. The transparent resin is mixed with a phosphor that emits visible light to near infrared light when excited by near ultraviolet light to blue light, and the phosphor is represented by MMgAl ₁₀ O _{17 as a} base material. M is any one or more elements selected from Ba, Sr, and Ca, and one or more elements of Eu and Mn are added as the emission center, High wavelength conversion efficiency. That is, a solar cell module having high photoelectric conversion efficiency can be produced by using the above-described phosphor as a wavelength conversion phosphor for solar cells.

  In this invention, since the efficiency of a wavelength conversion material is high, the photoelectric conversion efficiency of a solar cell can be improved. In the present invention, a phosphor is used as the wavelength conversion material. However, since the phosphor is excellent in stability, a highly reliable solar cell module can be realized.

  Moreover, the solar cell module excellent in productivity and with high photoelectric conversion efficiency is realizable by mixing the phosphor which is a wavelength conversion material material in a sealing material sheet.

It is a schematic diagram of the solar cell module at the time of mixing wavelength conversion material with a sealing material. It is a schematic diagram of the solar cell module at the time of forming a wavelength conversion layer between a sealing material and a solar cell element. It is a schematic diagram of a solar cell module when a wavelength conversion material is mixed in an antireflection film. It is a schematic diagram of a solar cell module when a wavelength conversion layer is formed between an antireflection film and a front glass. It is a schematic diagram of the concentrating solar power generation device at the time of taking a solar cell module in a concentrating solar cell. It is a graph which shows the wavelength conversion material excitation edge wavelength dependence for the increase in the generated electric power of a solar cell. It is a graph which shows the particle size dependence of light-scattering intensity | strength. It is the excitation spectrum and emission spectrum of the wavelength conversion material of this invention. It is a graph which shows the addition density | concentration dependence of the emitted light intensity of the wavelength conversion material of this invention.

<Structure of solar cell module>
The structure of the solar cell module of the present invention is shown in FIG. The solar cell module 1 includes a front glass 2, a sealing material (transparent resin) 3, a solar cell (solar cell element) 4, and a back sheet 5 installed on the side on which sunlight is incident. An antireflection film 6 is formed on the side where the light enters. Although an antireflection film is desirably present, it may not be present.

  The front glass 2 may be made of any of these materials as long as its component is transparent so as not to prevent the incidence of sunlight, such as polycarbonate, acrylic, polyester, and fluorinated polyethylene, in addition to glass. Moreover, the sealing material 3 has a role as a protective material, and is arrange | positioned so that the photovoltaic cell 4 which converts light energy into electrical energy may be covered. In addition to EVA (ethylene-vinyl acetate copolymer), a silicon potting material, polyvinyl butyral, or the like can be used as the sealing material.

  As the solar cell 4, various solar cell elements such as a single crystal silicon solar cell, a polycrystalline silicon solar cell, a thin film compound semiconductor solar cell, and an amorphous silicon solar cell can be used. One or a plurality of solar cells 4 are arranged in the solar cell module 1, and when a plurality of the solar cells 4 are arranged, they are electrically connected by an interconnector. Further, the back sheet 5 may contain a metal layer and a plastic film layer in order to provide weather resistance, high insulation, and strength.

  The wavelength conversion material 7 can be used by mixing with the sealing material 3 as shown in FIG. In this case, the sealing material 3 constitutes a wavelength conversion layer that absorbs near ultraviolet to blue light and emits green to near infrared light. Moreover, since a solar cell module is produced with the wavelength conversion film together with the sealing material 3, the manufacturing process can be simplified.

  Moreover, the said wavelength conversion layer should just exist at least while sunlight injects into the photovoltaic cell 4, At least between the light reception surface of the front glass 2, and the front glass 2 and the photovoltaic cell 4. If it is in. Moreover, since the wavelength conversion layer should just be able to absorb only the light which injects into a photovoltaic cell, it should just exist in the position which can supply the light converted into the incident part of the sunlight to the photovoltaic cell 4 at least. The surface area of the solar cell module 1 may not be uniformly present in the same area.

  Therefore, as a structure of the solar cell module, in addition to the configuration shown in FIG. 1, the wavelength conversion layer 8 can be formed on the solar cell side of the sealing material 3 as shown in FIG. 2. In this case, the distance of the light emitted from the wavelength conversion material to the solar cell element is short, and light diffusion can be suppressed.

  In addition, when the antireflection film 6 is provided as shown in FIG. 3, the wavelength conversion material 7 can be kneaded and used in the antireflection film 6. In this case, since the wavelength conversion film is produced together with the antireflection film 6, the manufacturing process can be simplified. Further, since the wavelength conversion film is formed on the surface of the front glass where the front glass 2 does not absorb ultraviolet light, the wavelength of ultraviolet light can be converted from visible light to near infrared light.

  Further, as shown in FIG. 4, a wavelength conversion film 8 can be formed between the antireflection film 6 and the front glass 2. In this case, since the wavelength conversion film 8 is formed on the surface where the front glass 2 does not absorb ultraviolet light, the wavelength of ultraviolet light can be converted from visible light to near infrared.

  Moreover, it can also be used as a concentrating solar cell like FIG. 5 using the condensing lens 9, the support frame 10, the board | substrate 11, etc. in said structure. Even if it is used as a concentrating solar cell, the wavelength conversion material converts high-energy short-wavelength light into low-energy long-wavelength light, reducing excess energy beyond the band gap of the solar cell element. The temperature rise of the element can be suppressed.

  As described above, as a solar cell having a structure in which a material containing a phosphor is installed in a path until light reaches the solar cell, a method of mixing with the material of the front glass 2 or the sealing material 3 is suitable. The method of mix | blending the wavelength conversion material 7 with a solvent, and apply | coating to a desired location etc. can be considered, and if the form which does not impair the absorption of the sunlight in the photovoltaic cell 4 and does not impair the function of the wavelength conversion material 7, any This method may be used. Among them, the method of kneading and using the wavelength conversion material 7 shown in FIG. 1 in the sealing material 3 can simplify the manufacturing method and is excellent as a method of installing the wavelength conversion material 7.

<Excitation edge wavelength, particle size, additive concentration as wavelength conversion material>
The quantum efficiency of solar cells generally changes from blue light to near ultraviolet light, and decreases as the wavelength of incident light becomes shorter. On the other hand, as the wavelength conversion material, a phosphor having a quantum efficiency of about 0.7 to 0.9 is used. The quantum efficiency here is the ratio of the outgoing light from the phosphor to the incident light on the phosphor, and can be measured by a quantum efficiency measuring device. Moreover, the light emission of the phosphor is isotropic, and there is a component of backward light emission that does not face the solar battery cell.

  For this reason, there exists a wavelength of an excitation band in which a decrease in the quantum efficiency of the solar cell, a quantum efficiency of the phosphor, and a ratio of backward light emission trade off. FIG. 6 shows the result of a trial calculation of the amount of increase in generated power when the excitation wavelength on the long wavelength side of the phosphor having an excitation band at 300 nm or more with sunlight spectrum intensity is changed. Here, the excitation end wavelength is a wavelength at which the excitation intensity on the long wavelength side rises in the excitation spectrum, and indicates a wavelength that is 10% of the peak intensity of the excitation spectrum.

  The increase in the generated power due to the wavelength conversion is seen when the excitation end wavelength is 350 to 670 nm at the quantum efficiency of 0.6 to 0.9. The increase in generated power is greatest when the excitation edge wavelength is 430 to 500 nm. That is, if the quantum efficiency of the wavelength conversion material is 0.6 to 0.9, the generated power of the solar cell can be maximized by using the wavelength conversion material having an excitation end wavelength of 430 to 500 nm. If the quantum efficiency is 0.7 to 0.9, the generated power of the solar cell can be maximized by using a wavelength conversion material having an excitation end wavelength of 450 to 500 nm. In addition, when the wavelength conversion material has a quantum efficiency of 0.7 or more, wavelength conversion using a conventional organic complex (quantum efficiency of about 0.6) is possible even if an excitation edge wavelength of 410 to 600 nm is used. In this case, the power generated by the solar cell can be improved.

  On the other hand, in the phosphor, there is a loss due to optical scattering in addition to the loss due to the backward light emission, and the degree is related to the particle size and the addition concentration. Regarding the relationship between the particle size of the wavelength converting material and the light scattering intensity, when the wavelength of sunlight is 500 nm, the light scattering intensity becomes maximum at a particle diameter of 250 nm, which is half of that, due to Mie scattering. The relationship between the light scattering intensity and the particle size is shown in FIG. Scattering intensity is governed by Rayleigh scattering at a particle size smaller than 250 nm, and the scattering intensity decreases as the particle size is smaller, and is governed by geometric optical scattering at a particle size larger than 250 nm, and the light scattering intensity decreases as the particle size increases. . If the particle size is small, the light scattering intensity decreases, but the emission intensity of the phosphor decreases. If the particle size is too large, it is necessary to increase the concentration of addition, which impairs the function of the sealing material. These factors need to be considered when setting the particle size, but a particle size range of 10 nm to 20 μm is appropriate.

  Next, the concentration of the wavelength conversion material added to the sealing material is such that at least one phosphor particle is present before the incident photon reaches the solar battery cell on the side where the sunlight is incident. It is desirable that the sunlight uniformly strike the phosphor mixed in the stopper.

  If the additive concentration is excessive, optical scattering increases, and if the additive concentration is too low, the light that passes through without wavelength conversion increases. Therefore, the addition concentration in the case of a phosphor having an average particle diameter of 2.3 μm is 2% by weight. In the case of a phosphor having an average particle size of 5.8 μm, the additive concentration is 5% by weight. Further, in the case of a phosphor having an average particle diameter of 1.2 μm, the addition concentration is 1% by weight. Therefore, when the average particle diameter of the phosphor is 1 to 5 μm, the addition concentration is 1 to 5% by weight. That is, when phosphors having large particle diameters are arranged, the weight% of the phosphors becomes large. However, here is the result of calculating the required amount of the phosphor, and there is an optimum concentration around this amount.

  Therefore, assuming that the average particle diameter of the phosphor is A (μm), the optimum concentration range B (weight%) starts to show an effect from about 1/200 times the optimum concentration 2A / 2.3, about 10 times. The effect is seen up to. Therefore, the concentration of the phosphor is good in the range of 0.004A ≦ B ≦ 8.7A, and more preferably 1/100 times the optimum concentration 2A / 2.3 in consideration of light stopping and light scattering. The effect of wavelength conversion is high in the range of about 5 times. Therefore, the concentration of the phosphor is optimum in the range of 0.008A ≦ B ≦ 4.3A.

<Production of wavelength conversion material>
The wavelength conversion material is preferably a material that can convert near-ultraviolet light to blue light of 500 nm or less into green light to near-infrared light of 500 nm to 1100 nm and enter the solar cell. The phosphor that enables this is a compound represented by MMgAl10O17, where M is one or more elements selected from Ba, Sr, and Ca.

  A material having an excitation band at 300 nm or more having a sunlight spectrum intensity, a quantum efficiency of 0.7 or more, and an excitation edge wavelength of 410 to 600 nm is preferable. In particular, a material having an excitation edge wavelength of 430 to 500 nm is most preferable. Furthermore, inorganic phosphor materials used for various displays, lamps, white LEDs, and the like are preferable from the viewpoint of luminance life and moisture resistance. However, the excitation band is limited to those distributed in the near ultraviolet light to blue light. In the present invention, a phosphor material composition having an excitation band in near ultraviolet light to blue light and having a high light conversion efficiency is selected from such a viewpoint.

(Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor having an average particle diameter of 5 μm to which europium and manganese were added was used as the wavelength conversion material. Next, a method for producing (Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn green light emitting phosphor used in the present invention will be described. BaCO ₃ , CaCO ₃ , MgCO ₃ , Al ₂ O ₃ , Eu ₂ O ₃ , and MnCO ₃ were used as the phosphor raw material. In addition, using the AlF ₃ as a flux. The mixing amount of each raw material is as follows.

BaCO ₃・ ・ ・ 0.814g
CaCO ₃・ ・ ・ 0.013g
MgCO ₃ ... 0.274g
Al ₂ O ₃ ... 2.549g
Eu ₂ O ₃・ ・ ・ 0.132g
MnCO ₃・ ・ ・ 0.201g
AlF ₃・ ・ ・ 0.004g

BaCO ₃ was reduced by the amount of Ca and Eu, assuming that Ca and Eu replace Ba. The Eu concentration was 15 mol%, and the Mn concentration was 35 mol%. After the raw materials were dry-mixed in a mortar, the alumina crucible was filled with the raw materials, and baked in a tubular furnace at 1450 ° C. in an N ₂ —H ₂ reducing atmosphere (H ₂ concentration 2%) for 3 hours. The obtained fired product was loosened to obtain the target (Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn green light emitting phosphor ([Ca] = 2.6 mol%).

The excitation spectrum and emission spectrum of this phosphor are shown in FIG. Looking at the excitation spectrum, the excitation band spreads over a wide range from 300 nm to 460 nm. The reason why the excitation band is wide is that Eu is added. In addition, when the emission spectrum is seen, there is a peak of emission at 515 nm, and the half width is narrow and sharp emission is shown. This light emission is caused by Mn, and energy transfer from Eu to Mn occurs. Since the quantum efficiency in the region of 300 nm to 460 nm in the solar cell is generally lower than the quantum efficiency in the green 515 nm, the wavelength of the solar cell can be converted by using (Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor. Photoelectric conversion efficiency can be improved.

In the (Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor, the relative value of the emission peak intensity (515 nm) of 365 nm excitation of the sample with the Ca concentration changed is shown in FIG. The emission peak intensity of the (Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor was increased as compared with the BaMgAl ₁₀ O ₁₇ : Eu, Mn phosphor by adding Ca. Ca produces an effect by adding a trace amount of about 0.01 mol%.

From FIG. 9, the relative luminance exceeds 100 in the range where the Ca concentration is less than 7 mol%. Accordingly, the Ca concentration is suitably in the range of more than 0.01 mol% and less than 9 mol%, more preferably in the range of more than 0.8 mol% and not more than 4 mol%. By setting the Ca concentration to 1 mol%, the relative emission peak intensity was improved by 6% compared to the BaMgAl ₁₀ O ₁₇ : Eu, Mn phosphor.

In addition, (Ba, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor was prepared, and the emission peak intensity excited at 365 nm was measured. Sr produces an effect by adding a trace amount of about 0.01 mol%. From FIG. 9, the relative luminance exceeds 100 in the range where the Sr concentration is smaller than 9 mol%. Accordingly, the Sr concentration is suitably in the range of more than 0.01 mol% and less than 9 mol%, more preferably in the range of more than 0.8 mol% and not more than 4 mol%.

In FIG. 9, the amount of Sr is further increased, and the relative luminance exceeds 100 at 16 mol% to 18 mol%. Therefore, even if the amount of Sr in this range is used, the effect can be improved. By setting the Sr concentration to 1 mol%, the relative emission peak intensity was improved by 4% compared to the BaMgAl ₁₀ O ₁₇ : Eu, Mn phosphor.

Similarly, a (Ba, Sr, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor was produced, and the emission peak intensity at 365 nm excitation was measured. As shown in FIG. 9, the Ca concentration was fixed at 2.6 mol%, and the relative luminance was evaluated by changing the concentration of Sr. In this case, as shown in FIG. 9, in the region where the amount of Sr is lower than 8 mol%, the relative luminance exceeds 100, which is effective. When the concentration of Sr is further increased, the relative luminance exceeds 100 when the concentration of Sr is in the range of 14 mol% to 21 mol%. Further, as shown in FIG. 9, by setting the Ca concentration to 2.6 mol% and the Sr concentration to 1 mol%, the relative emission peak intensity is improved by 7% compared to the BaMgAl ₁₀ O ₁₇ : Eu, Mn phosphor. I can do it.

Thus, the fluorescence of (Ba, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn, (Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn, and (Ba, Sr, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn By installing the body as a wavelength conversion material on the solar cell panel, the photoelectric conversion efficiency of the solar cell can be improved.

  As described above, the phosphor used in the present invention has an excitation wavelength band of 300 nm or more, an excitation edge wavelength of 430 to 600 nm, and a high quantum efficiency of 0.7 or more. Therefore, the power generation efficiency of the solar cell can be improved.

  The average particle size of the phosphor used in the present invention is 10 nm to 20 μm. Here, the average particle diameter of the phosphor can be defined as follows. As a method for examining the average particle size of the particles (phosphor particles), there are a method of measuring with a particle size distribution measuring device and a method of directly observing with an electron microscope. Taking the case of examining with an electron microscope as an example, the average particle diameter can be calculated as follows.

Variable amount of particle diameter (..., 0.8-1.2 [mu] m, 1.3-1.7 [mu] m, 1.8-2.2 [mu] m, ..., 6.8-7.2 [mu] m, 7.3 ˜7.7 μm, 7.8 to 8.2 μm,...), Etc., are classified into class values (..., 1.0 μm, 1.5 μm, 2.0 μm,. .5μm, 8.0μm, expressed in terms of ...), this is referred to as _{x i.} Then, if the frequency of each variable that is observed by an electron microscope to show by f _i, the average value A is expressed as follows.

_{A = Σx i f i / Σf} i = Σx i f i / N
However, Σf _i = N. In the phosphor of the present invention, since the excitation band wavelength is suitable as a wavelength conversion material, an excellent effect as a wavelength conversion material for solar cells can be obtained.

<Production of solar cell module>
Next, a solar cell module was produced using the wavelength conversion material. A small amount of an organic peroxide, a crosslinking aid, and an adhesion improver are added to a transparent resin (EVA), and an average particle diameter of 6 μm (Ba, Ca, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor is mixed and kneaded using a roll mill heated to 80 ° C., then sandwiched between two polyethylene terephthalates using a press, and a sealing material mainly composed of EVA having a thickness of 0.5 mm 3 was produced. The phosphor composition may be used by mixing one or more kinds of compositions.

  Next, the sealing material 3 is allowed to cool to room temperature, the polyethylene terephthalate film is peeled off, and laminated together with the front glass 2, the solar battery cell 4 and the back sheet 5 as shown in FIG. Pre-crimped with a laminator. The pre-bonded laminate was heated in an oven at 155 ° C. for 30 minutes, and crosslinked and bonded to produce a solar cell panel 1. In the present invention, a phosphor suitable for an excitation band is used as a wavelength conversion material, and a wavelength conversion material having a high light conversion efficiency is used. Therefore, when the current amount of the solar cell panel is large and the wavelength conversion material is not used. The amount of current increased by 5%. In addition, the luminance lifetime of the phosphor was improved as compared with the case where the organometallic complex was used.

Next, using a (Ba, Ca, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor having an average particle diameter of 10 nm to 100 nm as a wavelength conversion material, it was prepared in the same manner as the solar cell module, and the amount of current was measured. did. In the present invention, a phosphor suitable for an excitation band is used as a wavelength conversion material, and a wavelength conversion material with high light conversion efficiency is used. Therefore, when the current amount of the solar cell module is large and the wavelength conversion material is not used. The amount of current increased by 5%. Since the average particle size of the phosphor is as small as 10 nm to 100 nm, the luminance of the phosphor is low but the scattering is also low, so that the amount of current can be increased by 5%.

Next, using a (Ba, Ca, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor having an average particle diameter of 50 nm to 250 nm as a wavelength conversion material, it was prepared in the same manner as the solar cell module, and the amount of current was measured. did. In the present invention, a phosphor suitable for an excitation band is used as a wavelength conversion material, and a wavelength conversion material with high light conversion efficiency is used. Therefore, when the current amount of the solar cell module is large and the wavelength conversion material is not used. The amount of current increased by 6%.

Next, a (Ba, Ca, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor having an average particle diameter of 200 nm to 500 nm is used as the wavelength conversion material, and the current is measured in the same manner as the solar cell module. did. In the present invention, a phosphor suitable for an excitation band is used as a wavelength conversion material, and a wavelength conversion material with high light conversion efficiency is used. Therefore, when the current amount of the solar cell module is large and the wavelength conversion material is not used. The amount of current increased by 4%. Since the average particle diameter of the phosphor is larger, such as 200 nm to 500 nm, the luminance is improved. However, as shown in FIG. 7, since the scattering is also increased, the increasing amount of current is about 4%. .

Next, a (Ba, Ca, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor having an average particle diameter of 400 nm to 1 μm is used as a wavelength conversion material, and the current is measured in the same manner as in the solar cell module. did. In the present invention, a phosphor suitable for an excitation band is used as a wavelength conversion material, and a wavelength conversion material with high light conversion efficiency is used. Therefore, when the current amount of the solar cell module is large and the wavelength conversion material is not used. The amount of current increased by 4%. Since the average particle size of the phosphor becomes larger as 400 nm to 1 μm, the luminance is improved. However, as shown in FIG. 7, the scattering is also increased, so that the increasing current amount is about 4%. .

Next, using a (Ba, Ca, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor having an average particle diameter of 0.8 μm to 2 μm as the wavelength conversion material, the same as the solar cell module, and the amount of current Was measured. In the present invention, a phosphor suitable for an excitation band is used as a wavelength conversion material, and a wavelength conversion material with high light conversion efficiency is used. Therefore, when the current amount of the solar cell module is large and the wavelength conversion material is not used. The amount of current increased by 5%. Since the average particle diameter of the phosphor is further increased to 0.8 μm to 2 μm, the luminance is improved, and as shown in FIG. 7, the scattering starts to decrease, so the current amount should be increased by 5%. I can do it.

Next, using a (Ba, Ca, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor having an average particle diameter of 1 μm to 5 μm as a wavelength conversion material, it was prepared in the same manner as the solar cell module, and the amount of current was measured. did. In the present invention, a phosphor suitable for an excitation band is used as a wavelength conversion material, and a wavelength conversion material with high light conversion efficiency is used. Therefore, when the current amount of the solar cell module is large and the wavelength conversion material is not used. The amount of current increased by 5%. Since the average particle diameter of the phosphor is further increased to 1 μm to 5 μm, the luminance is improved, and as shown in FIG. 7, since the scattering is reduced, the amount of current can be increased by 5%. .

Next, using a (Ba, Ca, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn phosphor having an average particle diameter of 3 μm to 20 μm as a wavelength conversion material, it was fabricated in the same manner as the solar cell module, and the amount of current was measured. did. In the present invention, a phosphor suitable for an excitation band is used as a wavelength conversion material, and a wavelength conversion material with high light conversion efficiency is used. Therefore, when the current amount of the solar cell module is large and the wavelength conversion material is not used. The amount of current increased by 5%. Since the average particle diameter of the phosphor is further increased to 3 μm to 20 μm, the luminance is improved, and as shown in FIG. 7, since the scattering starts to decrease, the amount of current can be increased by 5%. .

  The present invention can be used for solar cell modules such as thin film polycrystalline silicon solar cells, thin film compound semiconductor solar cells, and amorphous silicon solar cells.

DESCRIPTION OF SYMBOLS 1 Solar cell module 2 Front glass 3 Sealing material 4 Solar cell element 5 Back sheet 6 Antireflection film 7 Wavelength conversion material 8 Wavelength conversion film 9 Condensing lens 10 Support frame 11 Substrate.

Claims (20)

It is an encapsulant sheet composed of an encapsulant that protects solar cells,
A phosphor is mixed in the sealing material,
The phosphor is a compound whose base material is represented by MMgAl ₁₀ O ₁₇ : Eu, Mn, and M is one or more elements selected from Ba, Sr, and Ca. A sealing material sheet. The encapsulant sheet according to claim 1,
A sealing material sheet used for a solar cell, wherein the sealing material contains an ethylene-vinyl acetate copolymer (EVA) as a main component. The encapsulant sheet according to claim 1 or 2,
The encapsulant sheet is characterized in that the encapsulant is a mixture of one or more additives selected from organic peroxides, crosslinking aids, and adhesion improvers. It is an encapsulant sheet composed of an encapsulant that protects solar cells,
A phosphor is mixed in the sealing material,
The phosphor is a compound whose base material is represented by (Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn, and has a Ca concentration greater than 0.01 mol% and less than 7 mol%. . The encapsulant sheet according to claim 4,
The phosphor base material is a compound represented by (Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn, and the Ca concentration is greater than 0.8 mol% and less than 4 mol%. Sheet. It is an encapsulant sheet composed of an encapsulant that protects solar cells,
A phosphor is mixed in the sealing material,
The phosphor is a compound whose base material is (Ba, Ca, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn. When the Ca concentration is 2.6 mol%, the Sr concentration is 0.01 mol% to 9 mol%. Or a range of 14 mol% to 21 mol%. It is an encapsulant sheet composed of an encapsulant that protects solar cells,
A phosphor is mixed in the sealing material,
The phosphor is a compound whose base material is represented by (Ba, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn, and the Sr concentration is in the range of 0.01 mol% to 9 mol%, or in the range of 16 mol% to 18 mol%. There is a sealing material sheet characterized by being. The encapsulant sheet according to claim 7,
The phosphor is a compound whose base material is represented by (Ba, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn, and has a Sr concentration in the range of 0.8 mol% to 4 mol%. . The encapsulant sheet according to claim 8,
A sealing material sheet, wherein the phosphor has a Mn concentration of 35 mol%. The encapsulant sheet according to claim 1,
An encapsulant sheet, wherein the phosphor has an average particle size of 10 nm or more and 20 μm or less. It is a sealing material sheet of Claims 1-10,
0.004A ≦ B ≦ 8.7A, where the average particle diameter of the phosphor is A (μm) and the amount of the phosphor added to the sealing material sheet is B (% by weight). A sealing material sheet. It is a sealing material sheet of Claims 1-10,
0.008A ≦ B ≦ 4.3A, where A (μm) is the average particle diameter of the phosphor and B (wt%) is the amount of phosphor added to the encapsulant sheet. A sealing material sheet. A solar cell module having a transparent substrate, a sealing material, solar cells and a back sheet,
The phosphor contains a phosphor in the path until the light reaches the solar cell, and the phosphor is a compound whose base material is represented by MMgAl ₁₀ O ₁₇ : Eu, Mn, and M is from Ba, Sr, and Ca. A solar cell module, which is any one or more selected elements. A solar cell module having a transparent substrate, a sealing material, solar cells and a back sheet,
The phosphor contains a phosphor in the path until the light reaches the solar cell. The phosphor is a compound whose base material is represented by (Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn, and the Ca concentration is 0.01 mol. A solar cell module characterized by being larger than% and smaller than 7 mol%. The solar cell module according to claim 14, wherein
A solar cell module, wherein the phosphor base material is a compound represented by (Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn, and the Ca concentration is larger than 0.8 mol% and not larger than 4 mol%. . A solar cell module having a transparent substrate, a sealing material, solar cells and a back sheet,
The phosphor contains a phosphor in the path until the light reaches the solar cell. The phosphor is a compound whose base material is represented by (Ba, Ca, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn, and the Ca concentration is 2 A solar cell module having a Sr concentration in the range of 0.01 mol% to 9 mol%, or in the range of 14 mol% to 21 mol%, when .6 mol% is set. A solar cell module having a transparent substrate, a sealing material, solar cells and a back sheet,
The phosphor contains a phosphor in the path until the light reaches the solar cell. The phosphor is a compound whose base material is represented by (Ba, Sr) MgAl ₁₀ O ₁₇ : Eu, Mn, and the Sr concentration is 0.01 mol. % To 9 mol%, or 16 mol% to 18 mol%. The solar cell module according to claim 17,
The phosphor is a compound whose base material is represented by (Ba, Sr) MgAl ₁₀ O ₁₇ and has a Sr concentration in a range of 0.8 mol% to 4 mol%. The solar cell module according to claim 18, wherein
A sealing material sheet, wherein the phosphor has a Mn concentration of 35 mol%. It is a solar cell module of Claims 13-19, Comprising:
An average particle diameter of the phosphor is 10 nm or more and 20 μm or less.

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