Light conversion agent film, light conversion repair film, preparation method of light conversion agent film and preparation method of light conversion repair film, and photovoltaic module

Abstract

The invention belongs to the field of solar cells, and discloses a light conversion agent film, a light conversion repair film, a preparation method thereof and a photovoltaic module. The light conversion agent film or the light conversion repairing film has strong adhesive force with the photovoltaic module, is not easy to fall off in the long-term use process, and can ensure the long-term stability and reliability of the film layer. The light conversion repair film prepared by the method has high conversion efficiency on ultraviolet light, can convert ultraviolet light with the wave band of 280-380 nm into blue light with the wave band of more than 380 nm, and effectively solves the problem of power loss of a photovoltaic module. Meanwhile, the method is simple in preparation process, low in cost and suitable for large-scale production, and the manufacturing cost of the photovoltaic module can be effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the field of solar cells, and particularly relates to a light conversion agent thin film, a light conversion repair film, a preparation method thereof, and a photovoltaic module. Background Art

[0002] Heterojunction (HJT) cells have a high theoretical limit efficiency and are one of the development directions of current high-efficiency photovoltaic modules. HJT modules usually convert ultraviolet (UV) light into visible light by matching with a light conversion adhesive film to improve the power of the module. However, the ultraviolet light transmittance of the front glass of the photovoltaic module is low, resulting in less ultraviolet light available for conversion reaching the adhesive film, and the visible light after light conversion is scattered by the adhesive film, so that less light actually reaches the surface of the cell, and the power improvement is limited.

[0003] Meanwhile, although the light conversion solution of the encapsulation adhesive film is a relatively mature solution, there is a problem of failure in all light conversion films. Generally, the reason for the failure of the light conversion agent is that when the light conversion agent is affected by factors such as light or temperature, the molecular structure of the light conversion agent changes, such as chemical bond breakage, molecular polymerization, etc., thereby affecting its light conversion performance.

[0004] Generally, the performance of the light conversion agent after failure is as follows:

[0005] 1. The conversion efficiency of the light conversion agent decreases: This is one of the most obvious manifestations of the failure of the light conversion agent, that is, the ability of the light conversion agent to convert light of a specific wavelength into light of a target wavelength decreases, resulting in a weakening of the converted light intensity and an inability to achieve the expected light utilization effect.

[0006] 2. The spectral characteristics change: The spectral absorption and emission characteristics of the failed light conversion agent may change, such as the shift of the absorption peak and emission peak positions, the change of the peak shape, the increase of the full width at half maximum, etc., so that the light absorption and emission ability of the light conversion agent is different from the original state. Summary of the Invention

[0008] In view of the above problems existing in the prior art, the present invention provides a light conversion agent thin film, a light conversion repair film, a preparation method thereof, and a photovoltaic module, so that a photovoltaic module containing the light conversion agent thin film or the light conversion repair film of the present invention can still prevent the photovoltaic module, especially the heterojunction cell, from being damaged by ultraviolet irradiation after the light conversion agent inside fails, and reduce the negative impact on the power of the photovoltaic module caused by the failure of the light conversion agent due to long use time.

[0009] Specifically, one aspect of the present invention provides a light conversion agent thin film, which is obtained by thermally curing a light conversion adhesive film; the crosslinking degree of the light conversion agent thin film is 80%-90%, and the light transmittance is 85%-94%; the light conversion adhesive film contains a light conversion agent and a resin, and the grammage of the light conversion adhesive film is 80-120 g / m 2 .

[0010] In one or more embodiments, the thickness of the light conversion agent film is 0.5 - 1 mm.

[0011] In one or more embodiments, the light conversion adhesive film is one or more selected from Foster F406D, Saiwu WT11, and Swick SZ247.

[0012] In one or more embodiments, the resin is one or more selected from bisphenol A epoxy resin, bisphenol F epoxy resin, phenolic epoxy resin, and glycidylamine epoxy resin.

[0013] In one or more embodiments, the mass fraction of the light conversion agent in the light conversion adhesive film is 10% - 13%.

[0014] Another aspect of the present invention provides a method for preparing the light conversion agent film described in any embodiment of the present invention, the method comprising the following steps:

[0015] The light conversion adhesive film is formed into a light conversion agent film by thermal curing treatment, the temperature of the thermal curing treatment is 110 - 130 °C, and the time is 15 - 25 min.

[0016] Another aspect of the present invention further provides a light conversion repair film, which sequentially comprises a substrate, a bonding interface layer, and the light conversion agent film described in any embodiment of the present invention.

[0017] In one or more embodiments, the substrate is glass or flexible plastic.

[0018] In one or more embodiments, the bonding interface layer is a cured adhesive.

[0019] In one or more embodiments, the adhesive is epoxy resin or silica gel.

[0020] In one or more embodiments, the thickness of the substrate is 0.5 - 1 mm, and the light transmittance is 85% - 100%.

[0021] In one or more embodiments, the thickness of the bonding interface layer is 0.1 - 0.3 mm, and the light transmittance is 85% - 100%.

[0022] In one or more embodiments, the bonding interface layer and the light conversion agent film are connected by chemical bonding.

[0023] In one or more embodiments, the light conversion repair film further includes an antireflection film provided on the side of the substrate facing away from the bonding interface layer.

[0024] In one or more embodiments, the material of the antireflection film is a multilayer film or a nanoporous material, and the thickness of the antireflection film is 0.05 - 0.3 mm.

[0025] In one or more embodiments, the multilayer film is composed of a base film and an adhesive. The base film is selected from one or more of a silicon dioxide film layer (SiO2), a titanium dioxide film layer (TiO2), an aluminum oxide film layer (Al2O3), a magnesium fluoride film layer (MgF2), and a calcium fluoride film layer (CaF2).

[0026] In one or more embodiments, the adhesive is an aqueous adhesive.

[0027] In one or more embodiments, the aqueous adhesive is a permanent acrylic latex.

[0028] Another aspect of the present invention also provides a method for preparing the light conversion repair film described in any embodiment of the present invention. The method includes the following steps:

[0029] S1: Coating an adhesive on the surface of the substrate and forming an adhesive interface layer by curing treatment;

[0030] S2: Attaching the light conversion agent thin film to the adhesive interface layer.

[0031] In one or more embodiments, the method further includes step S3: Attaching the antireflection film to the side of the substrate facing away from the adhesive interface layer.

[0032] In one or more embodiments, in step S1, the curing treatment is ultraviolet curing treatment or heat curing treatment; the ultraviolet light intensity of the ultraviolet curing treatment is 80 - 100 μW / cm 2 , the time is 10 - 20 min; the temperature of the heat curing treatment is 70 - 90 °C, and the time is 100 - 140 min.

[0033] Another aspect of the present invention also provides a photovoltaic module containing the light conversion agent thin film described in any embodiment of the present invention or containing the light conversion repair film described in any embodiment of the present invention.

[0034] In one or more embodiments, the photovoltaic module is a heterojunction cell.

[0035] The technical solution of the present invention has the following technical effects compared with the prior art:

[0036] 1. The light conversion agent thin film or the light conversion repair film of the present invention can effectively solve the problem of power loss of the module caused by the failure of the light conversion film in the photovoltaic module, especially the heterojunction module. This kind of light conversion agent thin film or light conversion repair film can convert ultraviolet light into blue light externally, thereby improving the power output of the module.

[0037] 2. The preparation process of the light conversion agent film or the light conversion repair film of the present invention is simple, with low cost and easy for large-scale production. Compared with the film preparation process of the prior art, the preparation process of the present invention is more convenient, which can greatly reduce the production cost and is conducive to popularization and application.

[0038] 3. The light conversion agent film or the light conversion repair film of the present invention adopts a special preparation process, which greatly enhances its adhesion to photovoltaic modules, especially heterojunction modules, and is not easy to fall off during long-term use, thus ensuring the long-term stability and reliability of the film. Description of the Drawings

[0039] Figure 1 It is a schematic diagram of the structure of a photovoltaic module and a light conversion repair film in some embodiments of the present invention.

[0040] Figure 2 It is a schematic diagram of the structure of the light conversion repair film in some embodiments of the present invention.

[0041] Figure 3 It is a comparison chart of the power attenuation of photovoltaic modules in Examples 1-3 and Comparative Examples 1-2.

[0042] Explanation of the reference numerals in the drawings is as follows: 1 is a photovoltaic module; 2 is a front glass; 3 is a front encapsulant film; 4 is a photovoltaic cell; 5 is a back encapsulant film; 6 is a back glass; 7 is a light conversion repair film; 7.1 is a substrate; 7.2 is an adhesive interface layer; 7.3 is a light conversion agent film; 7.4 is an antireflection film. Detailed Embodiments

[0043] To enable those skilled in the art to understand the features and effects of the present invention, the following provides a general description and definition of the terms and expressions mentioned in this article. Unless otherwise specified, all technical and scientific terms used in this article shall have the ordinary meaning understood by those skilled in the art for the present invention. In case of conflict, the definition in this specification shall prevail.

[0044] The theories or mechanisms described and disclosed in this article, whether correct or not, shall not limit the scope of the present invention in any way, that is, the content of the present invention can be implemented without being limited by any specific theory or mechanism.

[0045] In this article, terms such as "comprising", "including", "containing" and similar expressions cover the meanings of "consisting essentially of" and "consisting of". For example, when this article discloses that "A comprises B and C", it should be considered that "A consists essentially of B and C" and "A consists of B and C" have been disclosed herein.

[0046] In this text, all features defined in the form of numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are only for the sake of brevity and convenience. Accordingly, the description of a numerical range or percentage range should be regarded as having covered and specifically disclosed all possible sub-ranges and individual numerical values (including integers and fractions) within the range.

[0047] In this text, unless otherwise specified, the percentage refers to the mass percentage, and the ratio refers to the mass ratio.

[0048] In this text, when describing embodiments or examples, it should be understood that it is not intended to limit the present invention to these embodiments or examples. On the contrary, all alternatives, modifications, and equivalents of the methods and materials described in the present invention can be covered within the scope defined by the present invention.

[0049] In this text, for the sake of concise description, all possible combinations of all technical features in each embodiment or example are not described. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each embodiment or example can be combined arbitrarily, and all possible combinations should be considered as within the scope described in this specification.

[0050] The crosslinking degree of the light conversion agent film of the present invention is 80%-90%, such as 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%. Controlling the crosslinking degree of the light conversion agent film within the above range by adjusting the preparation process is beneficial for the light conversion agent film to achieve a light transmittance greater than 85%; the light transmittance of the light conversion agent film is 85%-94%, such as 85.12%, 85.96%, 86%, 86.14%, 86.5%, 86.70%, 87%, 87.5%, 87.94%, 88%, 88.5%, 89%, 89.5%, 90%, 90.5%, 91%, 91.5%, 92%, 92.5%, 93%, 93.5%. The light conversion adhesive film contains a light conversion agent and a resin, and the grammage of the light conversion adhesive film is 80-120 g / m 2 , such as 85 g / m 2 , 90 g / m 2 , 95 g / m 2 , 100 g / m 2 , 105 g / m 2 , 110 g / m 2 , 115 g / m 2 .

[0051] The thickness of the light conversion agent film is 0.5 - 1 mm, such as 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm. The mass fraction of the light conversion agent in the light conversion adhesive film is 10% - 13%, such as 10.5%, 11%, 11.5%, 12%, 12.5%.

[0052] The preparation method of the light conversion agent film of the present invention specifically includes the following steps:

[0053] The light conversion adhesive film is thermally cured to form a stable light conversion agent film. The temperature of the thermal curing treatment is 110 - 130 °C, such as 112 °C, 114 °C, 116 °C, 118 °C, 120 °C, 122 °C, 124 °C, 126 °C, 128 °C; the time is 15 - 25 min, such as 16 min, 17 min, 18 min, 19 min, 20 min, 21 min, 22 min, 23 min, 24 min; in the way of thermal curing, it is beneficial to form a stable film layer of the light conversion agent.

[0054] In the preparation method of the present invention, the test result of the crosslinking degree of the light conversion agent film after the light conversion adhesive film is thermally cured should be controlled within 80% - 90%. Controlling the crosslinking degree within the above range is beneficial to ensuring the stability of the film performance.

[0055] In the preparation method of the present invention, in the preparation method of the present invention, the test result of the light transmittance of the light conversion agent film after the light conversion adhesive film is thermally cured should be controlled to be greater than 85%. Controlling the light transmittance within the above range is beneficial to ensuring the power generation efficiency of the photovoltaic module made thereof.

[0056] The light conversion repair film of the present invention sequentially includes a substrate, a bonding interface layer and a light conversion agent film. Preferably, the light conversion repair film of the present invention further includes an antireflection film on the bottom surface of the substrate.

[0057] In the light conversion repair film of the present invention:

[0058] The thickness of the substrate is 0.5 - 1 mm, such as 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm; the light transmittance is 85% - 100%, such as 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%;

[0059] The thickness of the bonding interface layer is 0.1 - 0.3 mm, such as 0.12 mm, 0.14 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm; the light transmittance is 85% - 100%, such as 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%;

[0060] The thickness of the anti-reflection film is 0.05 - 0.3 mm, such as 0.1 mm, 0.12 mm, 0.14 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm.

[0061] The preparation method of the light conversion and repair film of the present invention specifically comprises the following steps:

[0062] S1: Coating an adhesive on the surface of the substrate and making the adhesive form a bonding interface layer through curing treatment;

[0063] S2: Attaching the light conversion agent film to the bonding interface layer.

[0064] In step S1, a material with good mechanical strength and optical transparency (such as glass or flexible plastic, preferably tempered glass) is selected as the substrate, which is beneficial to ensuring the power generation of the photovoltaic module made thereof.

[0065] In step S1, the curing treatment is ultraviolet curing treatment or heat curing treatment; the ultraviolet light intensity of the ultraviolet curing treatment is 80 - 100 μW / cm 2 , such as 82 μW / cm 2 , 84 μW / cm 2 , 86 μW / cm 2 , 88 μW / cm 2 , 90 μW / cm 2 , 92 μW / cm 2 , 94 μW / cm 2 , 96 μW / cm 2 , 98 μW / cm 2 , the time is 10 - 20 min, such as 12 min, 14 min, 16 min, 18 min; the temperature of the heat curing treatment is 70 - 90 °C, such as 72 °C, 74 °C, 76 °C, 78 °C, 80 °C, 82 °C, 84 °C, 86 °C, 88 °C, and the time is 100 - 140 min, such as 105 min, 110 min, 115 min, 120 min, 125 min, 130 min, 135 min.

[0066] The method for preparing the light conversion and repair film of the present invention may further include step S3: attaching an antireflection film to one side of the substrate facing away from the adhesive interface layer.

[0067] In the present invention, the binder is preferably a material that can form good adhesion with the substrate and the light conversion agent, such as epoxy resin or silica gel. The solvent for dissolving the binder is a conventional organic solvent, including but not limited to one or more of acetone, methyl ethyl ketone, toluene, xylene, and N,N-dimethylformamide (DMF).

[0068] The method of the present invention cures the binder by means of thermal curing or ultraviolet curing to form a stable binder interface layer.

[0069] In the present invention, by attaching the light conversion agent film to the binder interface layer, through the bonding action of the binder interface layer, the light conversion agent film can be firmly bonded to the photovoltaic module, especially the heterojunction module.

[0070] In the present invention, covering the front glass of the photovoltaic module with the light conversion and repair film is beneficial to the external conversion of ultraviolet light by the photovoltaic module.

[0071] In order to improve the conversion efficiency of the film for ultraviolet light, the present invention selects a light conversion film with high light transmittance, optimizes the thickness and structure of the film to maximize the utilization rate of the light conversion agent and the optical path length; secondly, a layer of antireflection film is coated on the surface of the film, and the antireflection film is a material that can transmit more ultraviolet light, such as a multilayer film or a nanoporous material. Through the above technical means, the photovoltaic module in the present invention uses a film prepared with a light conversion agent, which is attached to the front plate of the photovoltaic module, and converts ultraviolet light into blue light externally, which can effectively solve the problem of power decline of the photovoltaic module, especially the heterojunction module, when the light conversion film fails, and further improves the stability and power output of the photovoltaic module; at the same time, by using the above technical means, the manufacturing cost of the photovoltaic module is relatively low, which is beneficial to popularization, application and production.

[0072] The light conversion and repair film prepared by the method of the present invention has a high conversion efficiency for ultraviolet light, and can convert ultraviolet light in the wavelength range of 280nm - 380nm into blue light with a wavelength above 380nm, thus effectively solving the problem of power loss of the photovoltaic module, especially the heterojunction module.

[0073] The present invention will be described below by way of specific embodiments. It should be understood that these embodiments are only illustrative and are not intended to limit the scope of the present invention. The methods, reagents and materials used in the embodiments are conventional methods, reagents and materials in the art unless otherwise specified. The compounds in the embodiments can be obtained through commercial channels.

[0074] In the present invention, the crosslinking degree can be measured by the following method: weigh the total mass of the sample, denoted as W1; extract the ethylene-vinyl acetate copolymer (EVA) that has undergone crosslinking reaction in the sample using xylene, and weigh the mass of the remaining sample, denoted as W2. The calculation formula for the crosslinking degree is (W2 / W1)*100%.

[0075] In the present invention, the light transmittance is directly measured by the air-floating bench spectral transmittance measurement system (GST3) of Changzhou Jimai Machinery Co., Ltd.

[0076] Example 1

[0077] In this example, a light conversion repair film and a photovoltaic module are prepared through the following steps:

[0078] S1: Select an appropriate substrate; select tempered glass with a thickness of 0.5 mm and a light transmittance greater than 92% as substrate 7.1. Coat a layer of adhesive on substrate 7.1; select epoxy resin as the adhesive, prepare it into an acetone solution with a concentration of 1 mg / mL, and then uniformly coat it on the tempered glass substrate 7.1; through heat curing treatment, make the epoxy resin form a stable adhesive interface layer 7.2 with a thickness of 0.1 mm, and its heat curing temperature is 80 °C and the time is 2 h.

[0079] S2: Select a 100 g / m 2 Foster F406D light conversion adhesive film, and through lamination heat curing method, make the light conversion adhesive film form a stable light conversion agent thin film 7.3 with a thickness of 0.1 mm, and its heat curing temperature is 120 °C and the time is 20 min. The test result of the crosslinking degree of the light conversion agent thin film is 86.372%; the light transmittance of the light conversion agent thin film is 86.37%; through the bonding effect of the adhesive interface layer 7.2, make the light conversion agent thin film firmly bonded with the substrate 7.1.

[0080] S3: Coat a multilayer film (SiO2 as the base film, permanent acrylic latex as the adhesive) on the other surface of the substrate 7.1 as an antireflection film 7.4, and the thickness of the multilayer film is 100 nm, which can transmit most of the ultraviolet light.

[0081] S4: Cover the light conversion repair film 7 on the front glass of the photovoltaic module to obtain the photovoltaic module of this example.

[0082] Example 2

[0083] This example prepares a light conversion repair film and a photovoltaic module according to the method of Example 1, the difference is only that: in step S2, the 100 g / m 2 Foster F406D light conversion adhesive film is replaced with 100 g / m 2For the Saiwu WT11 light conversion adhesive film, through the method of lamination and thermal curing, a stable light conversion agent thin film 7.3 with a thickness of 0.1 mm is formed on the light conversion adhesive film. The temperature of thermal curing is 120 °C and the time is 20 min. The test result of the crosslinking degree of the light conversion agent thin film is 82.28%; the light transmittance of the light conversion agent thin film is 86.7%.

[0084] Example 3

[0085] In this example, a light conversion repair film and a photovoltaic module are prepared according to the method of Example 1, with the only difference being that in step S2, the 100 g / m 2 Foster F406D light conversion adhesive film is replaced with a 100 g / m 2 Swick SZ247 light conversion adhesive film. Through the method of lamination and thermal curing, a stable light conversion agent thin film 7.3 with a thickness of 0.1 mm is formed on the light conversion adhesive film. The temperature of thermal curing is 120 °C and the time is 20 min. The test result of the crosslinking degree of the light conversion agent thin film is 85.88%; the light transmittance of the light conversion agent thin film is 86.8%.

[0086] Comparative Example 1

[0087] The same photovoltaic module as in Example 1 is used, but the difference is that the front glass of the photovoltaic module is not subjected to the modification treatment in steps S1 - S4.

[0088] Comparative Example 2

[0089] A light conversion adhesive film and a photovoltaic module similar to those in Comparative Example 1 are prepared by a similar method, but the difference is that in step S2, when the light conversion agent thin film is combined with the substrate 7.1, instead of using the thermal curing method, a direct covering method is adopted for bonding.

[0090] Test Example

[0091] After the components in Examples 1 - 3 and Comparative Examples 1 - 2 of the present invention are fabricated (i.e., before aging), the maximum output power (P max ) of the corresponding photovoltaic modules is respectively tested by the IEC61215 - 2:2021 solar photovoltaic test method. After UV aging treatment (irradiated at a wavelength of 400 nm ultraviolet light for 60 h, and the irradiation intensity is 250 W / m 2 ), the P max values of the photovoltaic modules corresponding to Examples 1 - 3 and Comparative Examples 1 - 2 are respectively tested. The specific test results are shown in Table 1 and Figure 3 as follows.

[0092] Table 1: Performance test results of Examples 1 - 3 and Comparative Examples 1 - 2 before and after aging

[0093]

[0094]

[0095] From Table 1 and Figure 3 it can be seen that for the photovoltaic module obtained by the preparation process of the present invention, even after the light conversion adhesive film fails, the photovoltaic module still has relatively good electrochemical performance, and the degree of power attenuation is greatly reduced.

Claims

1. A photoconversion agent film, characterized in that: The photoconversion agent film is obtained by heat curing the photoconversion adhesive film; the crosslinking degree of the photoconversion agent film is 80%-90%, and the light transmittance is 85%-94%; the photoconversion adhesive film contains a photoconversion agent and a resin, and the gram weight of the photoconversion adhesive film is 80-120g / m 2 .

2. The photoconversion agent film according to claim 1, characterized in that: The photoconversion agent film has one or more of the following characteristics: The thickness of the photoconversion agent film is 0.5-1 mm; The optical transfer adhesive film is one or more selected from Foster F406D, Saiwu WT11 and Swick SZ247; The resin is one or more selected from bisphenol A epoxy resin, bisphenol F epoxy resin, novolac epoxy resin and glycidylamine epoxy resin; The mass fraction of the light-conversion agent in the light-conversion adhesive film is 10%-13%.

3. A method for preparing the light conversion agent film according to claim 1 or 2, characterized in that: The method comprises the following steps: The photoconverter film is formed into a photoconverter film by heat curing treatment, wherein the temperature of the heat curing treatment is 110-130° C. and the time is 15-25 minutes.

4. A light-conversion repair film, characterized in that: The photoconversion repair film comprises a substrate, a bonding interface layer and the photoconversion agent film according to claim 1 or 2 in sequence.

5. The light-conversion repair film according to claim 4, characterized in that: The substrate is glass or flexible plastic; and / or The bonding interface layer is a cured bonding agent, and preferably, the bonding agent is epoxy resin or silicone.

6. The light-conversion repair film according to claim 4, characterized in that: The photoremediation film has one or more of the following characteristics: The thickness of the substrate is 0.5-1 mm, and the light transmittance is 85%-100%; The thickness of the bonding interface layer is 0.1-0.3 mm, and the light transmittance is 85%-100%; The bonding interface layer is connected to the light conversion agent film through chemical bonding.

7. The light-conversion repair film according to claim 4, characterized in that: The light-converting repair film also includes an anti-reflection film arranged on the side of the substrate away from the bonding interface layer. Preferably, the material of the anti-reflection film is a multilayer film or a nanoporous material, and the thickness of the anti-reflection film is 0.05-0.3mm; the multilayer film is composed of a base film and an adhesive, and the base film is one or more selected from a silicon dioxide film layer (SiO2), a titanium dioxide film layer (TiO2), an aluminum oxide film layer (Al2O3), a magnesium fluoride film layer (MgF2) and a calcium fluoride film layer (CaF2); the adhesive is a water-based adhesive, preferably a permanent acrylic latex.

8. A method for preparing the light-conversion repair film according to any one of claims 4 to 7, characterized in that: The method comprises the following steps: S1: coating the adhesive on the surface of the substrate and forming a bonding interface layer through a curing process; S2: attaching the photoconverter film to the bonding interface layer; And optionally, step S3: attaching an antireflection film to a side of the substrate facing away from the bonding interface layer.

9. The method according to claim 8, characterized in that In step S1, the curing treatment is UV curing treatment or thermal curing treatment; the UV light intensity of the UV curing treatment is 80-100 μW / cm 2 , time is 10-20min; the heat curing treatment temperature is 70-90℃, and the time is 100-140min.

10. A photovoltaic module comprising the photoconversion agent film according to claim 1 or 2 or the photoconversion repair film according to any one of claims 4 to 7, preferably, the photovoltaic module is a heterojunction cell.

Images