Light conversion composite film, preparation method thereof and photovoltaic module

Abstract

The invention provides a light conversion composite film, a preparation method thereof and a photovoltaic module. The light conversion composite film comprises a light conversion layer and an organic anti-transfer layer located on at least one side of the light conversion layer. By arranging the organic anti-transfer layer, the light conversion agent is prevented from being migrated and separated out from the light conversion layer, so that the light conversion service life of the light conversion layer is prolonged, and the UV weather resistance of the photovoltaic module is improved.

Description

[0001] Related applications

[0002] This application is a divisional application of the Chinese invention patent application with the application date of December 22, 2023, application number 202311781692.3, and invention name “Light-converting composite film, preparation method thereof, and photovoltaic module”. Technical Field

[0003] The present invention relates to the technical field of photovoltaic modules, and in particular to a light-converting composite film, a preparation method thereof, and a photovoltaic module. Background Art

[0004] Solar cells directly convert light energy into electrical energy through the photoelectric or photochemical effects. Heterojunction (HJT) cells have a high theoretical efficiency limit. However, HJT cells are sensitive to ultraviolet (UV) light and are prone to power degradation under UV exposure. Traditionally, light-converting films have been used to address UV degradation in HJT modules. For example, UV-converting agents in the films convert UV light into visible light, preventing it from reaching the HJT cell surface and thus reducing its impact on cell power. However, current light-converting agents exhibit poor compatibility with the films and are prone to migration and precipitation, severely impacting the film's light conversion efficiency and lifespan. Summary of the Invention

[0005] Based on this, it is necessary to provide a light conversion composite film and its preparation method and photovoltaic module, by setting an organic anti-transfer layer to inhibit the migration and precipitation of the light conversion agent from the light conversion layer, thereby improving the light conversion life of the light conversion layer.

[0006] In a first aspect, the present application provides a light conversion composite film, comprising a light conversion layer and an organic anti-transfer layer located on at least one side of the light conversion layer.

[0007] In some embodiments, the material of the organic anti-transfer layer includes polymethyl methacrylate.

[0008] In some embodiments, the thickness of the organic anti-transfer layer is 20 μm to 100 μm.

[0009] In some embodiments, a coupling agent is dispersed in the organic anti-transfer layer.

[0010] In some embodiments, the light conversion layer includes a substrate layer and a light conversion agent dispersed in the substrate layer, and the light conversion agent includes at least one of an organic light conversion agent, an inorganic light conversion agent, and a hybrid light conversion agent.

[0011] In some embodiments, the light conversion agent accounts for 0.01% to 2% by weight in the substrate layer.

[0012] In some embodiments, the material of the substrate layer includes at least one of ethylene-vinyl acetate copolymer, polyvinyl butyral, polyolefin elastic material, and polyethylene foam material.

[0013] In some embodiments, the light conversion agent includes at least one of an organic fluorescent material, a rare earth metal oxide, a rare earth metal organic complex, and a quantum dot.

[0014] In some embodiments, the thickness of the light conversion layer is 260 μm to 600 μm.

[0015] In some embodiments, at least one of an antioxidant and a light stabilizer is further dispersed in the light conversion layer.

[0016] In some embodiments, a bonding layer or a cross-linking layer is further provided on the surface of the organic anti-transfer layer away from the light conversion layer.

[0017] In a second aspect, the present application provides a method for preparing the light-converting composite film according to the first aspect, the preparation method comprising:

[0018] preparing and forming a light conversion layer;

[0019] Organic anti-transfer layers are respectively formed on two opposite surfaces of the light conversion layer.

[0020] In some embodiments, the organic anti-transfer layer is prepared by at least one of a coating method and a deposition method.

[0021] In some embodiments, the organic anti-transfer layer is deposited using polymethyl methacrylate particles.

[0022] In some embodiments, the diameter of the polymethyl methacrylate particles is 0.1 μm to 5 μm.

[0023] In a third aspect, the present application provides a photovoltaic module, comprising the light-converting composite film as described in the first aspect.

[0024] In some embodiments, the photovoltaic module includes solar cells.

[0025] Along the direction away from the surface of the cell, the light-absorbing side of the cell is sequentially stacked with the light-converting composite film and the first glass layer.

[0026] Along the direction away from the surface of the cell, a film layer and a second glass layer are sequentially stacked on the backlight side of the cell.

[0027] Compared with traditional technologies, this application has at least the following beneficial effects:

[0028] The present application sets an organic anti-transfer layer on the surface of the light conversion layer. The organic anti-transfer layer is not only tightly bonded to the light conversion layer, but also can inhibit the migration and precipitation of the light conversion agent in the light conversion layer, thereby extending the service life of the light conversion layer and improving the long-term UV weather resistance of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a light-converting composite film provided in one embodiment of the present application.

[0030] Figure 2 This is another structural schematic diagram of the light-converting composite film provided in one embodiment of the present application.

[0031] Figure 3 This is another structural schematic diagram of the light-converting composite film provided in one embodiment of the present application.

[0032] Figure 4 This is a schematic structural diagram of a photovoltaic module provided in one embodiment of the present application.

[0033] Among them, 100 is a photovoltaic module; 110 is a first glass layer; 120 is a light-converting composite film; 121 is a light-converting layer; 122 is an organic anti-transfer layer; 123 is an adhesive layer; 124 is a cross-linking layer; 130 is a cell; 140 is an adhesive film layer; and 150 is a second glass. DETAILED DESCRIPTION

[0034] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0036] In this application, when referring to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values ​​within the numerical interval is deemed to be continuous and includes the two numerical endpoints of the numerical interval (i.e., the minimum and maximum values), as well as each numerical value between the two numerical endpoints. Unless otherwise specified, when a numerical interval refers only to integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe a feature or characteristic, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. "Numerical interval" is broadly allowed to include quantitative intervals such as percentage intervals, ratio intervals, and ratio intervals.

[0037] In this application, the terms "optionally," "optional," and "optional" mean optional or dispensable, i.e., they refer to either option being selected from two parallel options: "with" or "without." If a technical solution contains multiple "optional" clauses, each "optional" clause is independent unless otherwise specified and there are no contradictions or constraints.

[0038] In this application, the terms "first," "second," and "third," etc., in "the first aspect," "the second aspect," "the third aspect," etc., are used for descriptive purposes only and should not be understood as indicating or implying relative importance or quantity, nor as implicitly indicating the importance or quantity of the technical features indicated. Furthermore, "first," "second," and "third," etc., are only used for non-exhaustive enumeration and description purposes and should be understood not to constitute closed-ended limitations on quantity.

[0039] Traditionally, light conversion agents are classified into organic, inorganic, and hybrid types. Organic light conversion agents have poor weather resistance, while both inorganic and hybrid types have poor compatibility with the film and are prone to surface migration and precipitation, thus affecting the film's light conversion performance and lifespan. This application utilizes organic anti-transfer layers positioned on opposite sides of the light conversion layer. These layers effectively inhibit the surface migration and precipitation of the light conversion agent within the layer, extending the lifespan of the composite film and ultimately improving the long-term UV weatherability of the photovoltaic module.

[0040] like Figure 1 As shown, the first aspect of the present application provides a light conversion composite film 120 , which includes a light conversion layer 121 and an organic anti-transfer layer 122 located on at least one side of the light conversion layer 121 .

[0041] In the present application, an organic anti-transfer layer 122 is provided on the surface of the light conversion layer 121. The organic anti-transfer layer 122 is not only tightly bonded to the light conversion layer 121, but also can inhibit the migration and precipitation of the light conversion agent in the light conversion layer 121, thereby extending the service life of the light conversion layer 121 and improving the long-term UV weather resistance of the photovoltaic module.

[0042] It should be noted that the light transfer layer 121 in the present application may be a material layer capable of converting ultraviolet light into visible light. The organic anti-transfer layer 122 in the present application refers to an organic material layer that prevents material migration.

[0043] It should be noted that the organic anti-transfer layer 122 is located on at least one side of the light conversion layer 121 , which means that the organic anti-transfer layer 122 is located on one side or both sides of the light conversion layer 121 .

[0044] In some embodiments, the material of the organic anti-transfer layer 122 includes polymethyl methacrylate.

[0045] The present application uses organic materials as the anti-transfer layer, so the introduced organic anti-transfer layer 122 has poor bonding with the layered structure of the photovoltaic module. Polymethyl methacrylate is preferred, as it has good light transmittance and stability, as well as low cost and ease of processing.

[0046] In some embodiments, the thickness of the organic anti-transfer layer 122 is 20 μm to 100 μm, for example, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, or 100 μm.

[0047] The present application controls the thickness of the organic anti-transfer layer 122 , thereby ensuring a good transfer inhibition effect while preventing the light conversion composite film 120 from being too thick and affecting the transmittance.

[0048] In some embodiments, a coupling agent is dispersed in the organic anti-transfer layer 122 .

[0049] In the present application, a coupling agent is dispersed in the organic anti-migration layer, and the coupling agent can improve the bonding force between the organic anti-migration layer 122 and other material layers.

[0050] In some embodiments, the coupling agent includes a silane coupling agent, for example, at least one of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltert-butyltriperoxidesilane, vinyltriacetoxysilane, and vinyltri(β-methoxyethoxy)silane.

[0051] In some embodiments, the coupling agent accounts for 0.2% to 5% by mass in the organic anti-transfer layer 122, for example, 0.2%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5% or 5.0%.

[0052] In some embodiments, the light conversion layer 121 includes a substrate layer and a light conversion agent dispersed in the substrate layer. The light conversion agent includes at least one of an organic light conversion agent, an inorganic light conversion agent, and a hybrid light conversion agent.

[0053] In some embodiments, the mass proportion of the light conversion agent in the substrate layer is 0.01% to 2%, for example, it can be 0.01%, 0.05%, 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8% or 2.0%.

[0054] In some embodiments, the material of the substrate layer includes at least one of ethylene vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), polyolefin elastomer (POE), and polyethylene foam (EPE).

[0055] In some embodiments, the light conversion agent includes at least one of an organic fluorescent material, a rare earth metal oxide, a rare earth metal organic complex, and a quantum dot. Examples include organic compounds with large conjugated groups such as distyrylbisbenzoxazole and 2,5-bis(5-tert-butyl-2-benzoxazolyl)thiophene, rare earth metal oxides, rare earth metal β-diketones, organic carboxylic acid complexes, C quantum dots, CdS quantum dots, CdSe quantum dots, CdTe quantum dots, ZnS quantum dots, ZnSe quantum dots, and ZnTe quantum dots. The rare earth metal may be Y, Eu, Sr, Tb, Er, or Yb.

[0056] In some embodiments, the thickness of the light conversion layer 121 is 260 μm to 600 μm, for example, 260 μm, 300 μm, 340 μm, 380 μm, 420 μm, 460 μm, 500 μm, 540 μm, 580 μm, or 600 μm.

[0057] In some embodiments, at least one of an antioxidant and a light stabilizer is further dispersed in the light conversion layer 121 .

[0058] In the present application, antioxidants and light stabilizers are added to the light conversion layer 121 to improve the stability and weather resistance of the light conversion layer 121 .

[0059] In some embodiments, a bonding layer 123 or a cross-linking layer 124 is further provided on the surface of the organic anti-transfer layer 122 away from the light conversion layer 121 .

[0060] In the present application, a bonding layer 123 or a cross-linking layer 124 is provided on the surface of the organic anti-transfer layer 122 to improve the bonding stability between the light-converting composite film 120 and other film layers.

[0061] In some embodiments, as Figure 2 As shown, the light conversion composite film 120 includes a light conversion layer 121 , and both sides of the light conversion layer 121 are sequentially laminated with an organic anti-transfer layer 122 and a bonding layer 123 .

[0062] In some embodiments, as Figure 3 As shown, the light conversion composite film 120 includes a light conversion layer 121 , and both sides of the light conversion layer 121 are sequentially laminated with an organic anti-transfer layer 122 and a cross-linking layer 124 .

[0063] In some embodiments, the thickness of the adhesive layer 123 is 50 μm to 200 μm, for example, 50 μm, 60 μm, 80 μm, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm or 200 μm.

[0064] In some embodiments, the material of the adhesive layer 123 is the same as the base material of the light conversion layer 121. Optionally, the material of the adhesive layer 123 includes at least one of ethylene-vinyl acetate copolymer, polyvinyl butyral, polyolefin elastic material, and polyethylene foam material.

[0065] In some embodiments, the thickness of the cross-linked layer 124 is 20 μm to 100 μm, for example, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm or 100 μm.

[0066] In some embodiments, the cross-linking layer 124 includes a main body and a cross-linking agent dispersed within the main body. The main body is made of the same material as the base material of the light-converting layer 121. For example, the main body can be made of at least one of ethylene-vinyl acetate copolymer, polyvinyl butyral, a polyolefin elastic material, and polyethylene foam. The cross-linking agent includes at least one of triallyl isocyanurate, triallyl cyanurate, trimethylolpropane trimethacrylate, diethylene glycol dimethacrylate, cumyl peroxide, di-tert-butyl peroxide, diisopropylbenzene hydroperoxide, 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane, n-butyl 4,4-di(tert-amylperoxy)valerate, tert-butyl peroxy-2-ethylhexyl carbonate, and ethyl 3,3-di(tert-butylperoxy)butyrate.

[0067] A second aspect of the present application provides a method for preparing the light-converting composite film 120 as described in the first aspect, the method comprising:

[0068] Preparing and forming a light conversion layer 121;

[0069] Organic anti-transfer layers 122 are formed on two opposite surfaces of the light conversion layer 121 .

[0070] In some embodiments, the organic anti-transfer layer 122 is prepared by at least one of a coating method and a deposition method.

[0071] In some embodiments, the organic anti-transfer layer 122 is deposited using polymethyl methacrylate particles.

[0072] In some embodiments, the method for preparing the organic anti-transfer layer 122 includes:

[0073] The light conversion layer 121 is placed in a solution containing PMMA particles, and the solvent in the solution is extracted, and the PMMA particles are deposited on the surface of the light conversion layer 121 to form the organic anti-transfer layer 122. Optionally, the above addition is repeated to obtain organic anti-transfer layers 122 of different thicknesses.

[0074] In some embodiments, the diameter of the polymethyl methacrylate particles is 0.1 μm to 5 μm, for example, 0.1 μm, 0.2 μm, 0.5 μm, 1.0 μm, 1.5 μm, 2.0 μm, 2.5 μm, 3.0 μm, 3.5 μm, 4.0 μm, 4.5 μm or 5.0 μm.

[0075] The present application controls the diameter of the PMMA particles, thereby adjusting the gap between the PMMA particles in the organic anti-transfer layer 122 , and further making the gap smaller than the particle size of the light conversion agent, thereby effectively preventing the migration and precipitation of the light conversion agent.

[0076] In some embodiments, the method for preparing the light conversion layer 121 includes:

[0077] The monomer of the substrate material, a cross-linking agent, an additive and a light-converting agent are mixed to obtain a slurry, which is then coated and hot-pressed to obtain the light-converting layer 121. The additive includes at least one of a co-cross-linking agent, an antioxidant, a coupling agent and a light stabilizer.

[0078] A third aspect of the present application provides a photovoltaic module, which includes the light-converting composite film 120 as described in the first aspect.

[0079] In some embodiments, the photovoltaic module 100 includes a cell 130. Preferably, the cell 130 is a HJT cell.

[0080] like Figure 4 As shown, along the direction away from the surface of the cell 130 , the light-absorbing side of the cell 130 is sequentially stacked with the light-converting composite film 120 and the first glass layer 110 .

[0081] Along the direction away from the surface of the cell 130 , a film layer 140 and a second glass layer 150 are sequentially stacked on the backlight side of the cell 130 .

[0082] In some embodiments, the thickness of the first glass layer 110 is 1 mm to 10 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0083] In some embodiments, the thickness of the adhesive film layer 140 is 300 μm to 800 μm, for example, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 550 μm, 600 μm, 650 μm, 700 μm, 750 μm, or 800 μm. Optionally, the material of the adhesive film layer 140 includes at least one of ethylene-vinyl acetate copolymer, polyvinyl butyral, polyolefin elastic material, and polyethylene foam material.

[0084] In some embodiments, the thickness of the second glass 150 layer is 1 mm to 10 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0085] The embodiments of the present invention will be described in detail below with reference to the examples. It should be understood that these examples are intended to illustrate the present invention only and are not intended to limit the scope of the invention. For experimental methods in the following examples where specific conditions are not specified, reference is made to the guidance provided in the present invention, and may also be made according to experimental manuals or conventional conditions in the art, or according to conditions recommended by the manufacturer, or with reference to experimental methods known in the art.

[0086] Example 1

[0087] This embodiment provides a solar cell, including a cell 130, wherein the cell 130 is an HJT cell, and a light-absorbing surface of the cell 130 is sequentially stacked with a light-converting composite film 120 and a first glass layer 110; and a backlight surface of the cell 130 is sequentially stacked with a film layer 140 and a second glass layer 150.

[0088] The light-converting composite film 120 comprises a light-converting layer 121 and organic anti-transfer layers 122 disposed on both sides of the light-converting layer 121. The base layer of the light-converting layer 121 is made of EVA and dispersed with a CdS quantum dot light-converting agent, which accounts for 0.02% by weight of the base layer. The thickness of the light-converting layer 121 is 400 μm, and the thickness of the organic anti-transfer layer 122 is 20 μm. The thickness of the first glass layer 110 is 2 mm, and the thickness of the second glass layer 150 is 2 mm. The adhesive film layer 140 is a 440 μm thick layer of ethylene-vinyl acetate copolymer.

[0089] The method for preparing the organic anti-transfer layer 122 includes:

[0090] The light conversion layer 121 is placed in a solution containing PMMA particles, and the solvent in the solution is extracted. The PMMA particles are deposited on the surface of the light conversion layer 121 to form the organic anti-transfer layer 122 , wherein the diameter of the PMMA particles is 1 μm.

[0091] Example 2

[0092] This embodiment provides a solar cell. Compared to Example 1, the only difference is that the light conversion agent accounts for 1% by weight of the substrate layer. The light conversion layer 121 has a thickness of 260 μm, the organic anti-transfer layer 122 has a thickness of 60 μm, the PMMA particles have a diameter of 5 μm, and a coupling agent is dispersed within the organic anti-transfer layer 122, accounting for 3% by weight of the coupling agent.

[0093] Example 3

[0094] This embodiment provides a solar cell. Compared to Example 1, the only difference is that the light conversion agent accounts for 2% by weight of the substrate layer. The light conversion layer 121 is 600 μm thick, the organic anti-transfer layer 122 is 100 μm thick, the PMMA particles have a diameter of 0.1 μm, and a bonding layer 123 is provided on the surface of the organic anti-transfer layer 122 facing away from the light conversion layer 121. The bonding layer 123 is a 100 μm thick layer of ethylene-vinyl acetate copolymer.

[0095] Example 4

[0096] This embodiment provides a solar cell. Compared with Example 1, the only difference is that a cross-linking layer 124 is provided on the surface of the organic anti-transfer layer 122 away from the light conversion layer 121. The thickness of the cross-linking layer 124 is 60 μm, the main material is ethylene-vinyl acetate copolymer, and the cross-linking agent is triallyl isocyanurate.

[0097] Example 5

[0098] This embodiment provides a solar cell. Compared with the embodiment 1, the only difference is that the thickness of the anti-transfer layer is 10 μm.

[0099] Example 6

[0100] This embodiment provides a solar cell. Compared with Embodiment 1, the only difference is that the diameter of the PMMA particles is 7 μm.

[0101] Comparative Example 1

[0102] This embodiment provides a solar cell. Compared with the embodiment 1, the only difference is that the organic anti-transfer layer 122 is replaced by PVDF material.

[0103] Comparative Example 2

[0104] This embodiment provides a solar cell. Compared with the embodiment 1, the only difference is that the organic anti-transfer layer 122 is replaced by a silicon dioxide layer.

[0105] Comparative Example 3

[0106] This embodiment provides a solar cell. Compared with the embodiment 1, the only difference is that the organic anti-transfer layer 122 is not provided.

[0107] The solar cells prepared in the above examples and comparative examples were subjected to performance tests, and the testing method included:

[0108] The solar panels were exposed to ultraviolet (UV) radiation with an intensity of 120W, an irradiation time of 500h, and a cumulative irradiation of 60kWh. The power attenuation of the solar panels before and after UV irradiation was measured. Power attenuation refers to the rate of change of the power of the solar panels after UV irradiation relative to that before irradiation.

[0109] The test results are shown in Table 1.

[0110] Table 1

[0111]

[0112] From the table above we can see that:

[0113] (1) By comparing Example 1 with Example 5, it can be seen that the present application controls the thickness of the organic anti-transfer layer 122, thereby ensuring a good transfer inhibition effect while avoiding the light conversion composite film 120 being too thick and affecting the size of the photovoltaic module.

[0114] (2) By comparing Example 1 with Example 6, it can be seen that the present application controls the diameter of the polymethyl methacrylate particles, thereby adjusting the gap between the PMMA particles in the organic anti-transfer layer 122, and further making the gap smaller than the particle size of the light conversion agent, thereby effectively preventing the migration and precipitation of the light conversion agent.

[0115] (3) By comparing Example 1 with Comparative Examples 1-3, it can be seen that the present application sets an organic anti-transfer layer 122 on the surface of the light conversion layer 121. The organic anti-transfer layer 122 is not only tightly combined with the light conversion layer 121, but also can inhibit the migration and precipitation of the light conversion agent in the light conversion layer 121, thereby extending the service life of the light conversion layer 121 and improving the long-term UV weather resistance of the photovoltaic module.

[0116] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0117] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A light-converting composite film, characterized in that: The light-conversion composite film includes a light-conversion layer and an organic anti-transfer layer located on one side of the light-conversion layer; the thickness of the organic anti-transfer layer is 20 μm to 100 μm, the material of the organic anti-transfer layer includes polymethyl methacrylate particles, the diameter of the polymethyl methacrylate particles is 0.1 μm to 5 μm, the light-conversion layer includes a substrate layer and a light-conversion agent dispersed in the substrate layer, and the gap between each polymethyl methacrylate particle is smaller than the diameter of the light-conversion agent.

2. The light-converting composite film according to claim 1, wherein: A coupling agent is dispersed in the organic anti-transfer layer.

3. The light-converting composite film according to claim 2, wherein: The coupling agent satisfies at least one of the following conditions: (1) The coupling agent includes a silane coupling agent; (2) The coupling agent accounts for 0.2% to 5% by mass in the organic anti-transfer layer.

4. The light-converting composite film according to claim 1, wherein: The light conversion agent includes at least one of an organic light conversion agent, an inorganic light conversion agent and a hybrid light conversion agent.

5. The light-converting composite film according to claim 4, wherein: The light conversion layer satisfies at least one of the following conditions: (1) The mass proportion of the light conversion agent in the substrate layer is 0.01% to 2%; (2) The material of the substrate layer includes at least one of ethylene-vinyl acetate copolymer, polyvinyl butyral, polyolefin elastic material and polyethylene foam material; (3) The light conversion agent includes at least one of an organic fluorescent material, a rare earth metal oxide, a rare earth metal organic complex, and a quantum dot; (4) The thickness of the light conversion layer is 260 μm to 600 μm; (5) At least one of an antioxidant and a light stabilizer is also dispersed in the light conversion layer.

6. The light-converting composite film according to any one of claims 1 to 5, characterized in that: A bonding layer or a cross-linking layer is further provided on the surface of the organic anti-transfer layer away from the light conversion layer.

7. A method for preparing the light-converting composite film according to any one of claims 1 to 6, characterized in that: The preparation method comprises: preparing and forming a light conversion layer; An organic anti-transfer layer is formed on one surface of the light conversion layer; the organic anti-transfer layer is obtained by depositing polymethyl methacrylate particles, and the diameter of the polymethyl methacrylate particles is 0.1 μm to 5 μm.

8. The preparation method according to claim 7, wherein The preparation method of the organic anti-transfer layer comprises: The light conversion layer is placed in a solution containing polymethyl methacrylate particles, and the solvent in the solution is extracted to deposit the polymethyl methacrylate particles on the surface of the light conversion layer to form the organic anti-transfer layer.

9. A photovoltaic module, characterized in that: The photovoltaic module comprises the light-converting composite film according to any one of claims 1 to 6.

10. The photovoltaic module according to claim 9, wherein: The photovoltaic module includes a cell; Along the direction away from the surface of the cell, the light-absorbing side of the cell is sequentially stacked with the light-converting composite film and the first glass layer; Along the direction away from the surface of the cell, a film layer and a second glass layer are sequentially stacked on the backlight side of the cell.

Images