Coated light conversion powder and photovoltaic adhesive film using the same

Abstract

The application provides a coated light conversion powder and a photovoltaic adhesive film using the light conversion powder. The coated light conversion powder is composed of an organic light conversion agent and an inorganic coating layer, wherein the organic light conversion agent is a benzotriazole derivative, and the inorganic coating layer is obtained by atomic deposition. The light conversion powder has good compatibility with the photovoltaic adhesive film, high light transmittance, good aging resistance, and improves the power generation efficiency of a photovoltaic module.

Description

Technical Field

[0001] The present invention relates to a light-conversion powder and the application of the light-conversion powder in the photovoltaic field. Background Art

[0002] Light-conversion materials can convert ultraviolet light into visible light. Currently, photovoltaic modules mostly use light-conversion materials added to the encapsulation film to improve the photoelectric conversion efficiency of solar cells. The light-conversion materials used in photovoltaic films mainly include inorganic metal oxide phosphors, organic dye phosphors and rare earth complexes.

[0003] Among them, inorganic metal oxide phosphors have poor compatibility with organic resins, which can easily reduce light transmittance and have weak absorption of ultraviolet rays, resulting in low light conversion efficiency; rare earth coordination compounds have weak absorption of ultraviolet rays, a narrow fluorescence emission range, and the emitted light is difficult to be fully converted by the solar cell, and the overall conversion efficiency is also not high; while organic dye phosphors have good compatibility with EVA / POE films, the films have excellent light transmittance and strong ultraviolet absorption, which greatly improves the overall light conversion efficiency; but contact between organic dye phosphors and films will lead to a decrease in the quantum efficiency of the light conversion powder, but organic dye phosphors are easily affected by oxygen and moisture in the environment, have poor aging resistance, and their light conversion efficiency decreases after aging. Currently, organic monomers are polymerized into films or inorganic carriers are used to coat and protect organic dye phosphors. However, the protective films formed by organic monomer polymers and inorganic carriers will have a certain impact on light transmittance, which in turn affects the photoelectric conversion efficiency of photovoltaic modules. Summary of the Invention

[0004] In order to provide a light conversion powder that has good compatibility with the matrix resin used in photovoltaic films, high light transmittance, good aging resistance, and improves the efficiency of photovoltaic modules, this application adopts the following technical solutions:

[0005] A coated light conversion powder is composed of an organic light conversion agent and an inorganic coating layer, wherein the organic light conversion agent is a benzotriazole derivative and the inorganic coating layer is obtained by an atomic deposition method.

[0006] Furthermore, the structural formula of the benzotriazole derivative is shown in formula a:

[0007]

[0008] wherein R1, R2, R3, R4, and R5 are each independently selected from optionally substituted alkyl, optionally substituted alkenyl, optionally substituted heteroalkyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted amino, optionally substituted cyclic imino, optionally substituted alkoxy, optionally substituted carboxyl, and optionally substituted carbonyl.

[0009] Furthermore, the organic light conversion agent is in granular form, and the particle size D50 is between 10 nanometers and 100 micrometers.

[0010] Furthermore, the organic light conversion agent is in granular form and has a specific surface area of ​​0.1-2000m 2 / g.

[0011] Furthermore, the thickness of the inorganic coating layer ranges from 1 nanometer to 50 nanometers.

[0012] Furthermore, the inorganic coating layer is selected from one or more of silicon dioxide, zirconium oxide, aluminum oxide, titanium oxide, zinc oxide, magnesium oxide, barium oxide, magnesium fluoride, calcium fluoride, and silicon nitride.

[0013] A photovoltaic adhesive film containing the coated light conversion powder, wherein the photovoltaic adhesive film uses EVA or POE as a matrix resin and has a light transmittance greater than 90%. In the photovoltaic adhesive film, based on 100 parts of the EVA or POE resin, the weight portion of the coated light conversion powder is 0.05-5 parts. DETAILED DESCRIPTION

[0014] In order to make the invention purpose, technical solution and beneficial technical effect of the present invention clearer, the present invention is described in detail below with reference to specific embodiments. It should be understood that the embodiments described in this specification are only for explaining the present invention and are not intended to limit the present invention.

[0015] For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, and similarly, any upper limit can be combined with any other upper limit to form an unspecified range. In addition, although not explicitly stated, each point or individual value between the endpoints of a range is included in the range. Thus, each point or individual value can serve as its own lower limit or upper limit and be combined with any other point or individual value, or with other lower limits or upper limits, to form an unspecified range.

[0016] In the description of this article, it should be noted that, unless otherwise specified, “above” and “below” are inclusive of the number themselves, and “a variety” in “one or more” means more than two.

[0017] The above summary of the invention is not intended to describe every disclosed embodiment or every implementation of the present invention. The following description more specifically illustrates exemplary embodiments. In many places throughout the application, guidance is provided by a series of examples, which can be used in various combinations. In each example, the enumeration is intended only as a representative group and should not be construed as exhaustive.

[0018] The organic light conversion agents used in the present invention are all commercially available products;

[0019] The particle size of the light conversion agent was measured by a laser particle size analyzer; the specific surface area was determined by the BET method;

[0020] The transmittance of the light conversion films used in the examples was tested with reference to GB / T29848-2018.

[0021] Refer to 4.10 of IEC61215-2:2016 to test the initial power of the module and the power attenuation after damp heat aging (experimental conditions are temperature 85°C, relative humidity 85%, 1000 hours);

[0022] Refer to 10.10 of IEC61215 2:2015 to test the power attenuation of the components after UV aging (experimental conditions: temperature 60°C, 120KWh).

[0023] Example 1

[0024] The coated light-converting powder is composed of a benzotriazole derivative organic light-converting agent and a silicon dioxide ALD coating layer. The particle size D50 of the light-converting agent is 10 nanometers and the specific surface area is 2000m 2 / g, the thickness of the silicon dioxide coating layer is 1 nanometer, and the molecular formula of the organic light conversion agent is shown in formula B-1:

[0025]

[0026] Example 2

[0027] The coated light-converting powder is composed of a benzotriazole derivative organic light-converting agent and a zirconium oxide ALD coating layer. The particle size D50 of the light-converting agent is 100 microns and the specific surface area is 0.1m 2 / g, the thickness of the zirconium oxide coating layer is 50 nanometers, and the molecular formula of the organic light conversion agent is shown in formula B-2:

[0028]

[0029] Example 3

[0030] The coated light-converting powder is composed of a benzotriazole derivative organic light-converting agent and an aluminum oxide ALD coating layer. The particle size D50 of the light-converting agent is 10 microns and the specific surface area is 10m 2 / g, the thickness of the aluminum oxide coating layer is 10 nanometers, and the molecular formula of the organic light conversion agent is shown in formula B-3:

[0031]

[0032] Example 4

[0033] The coated light-converting powder is composed of a benzotriazole derivative organic light-converting agent and a silicon nitride ALD coating layer. The particle size D50 of the light-converting agent is 100 nanometers and the specific surface area is 200m 2 / g, the thickness of the silicon nitride coating is 20 nanometers, and the molecular formula is shown in formula B-4:

[0034]

[0035] Application Example 1

[0036] The light-conversion powder described in Example 1 was applied to an EVA photovoltaic film. The film contained, in addition to 100 parts EVA resin and 0.05 parts light-conversion powder, 0.5 parts peroxide crosslinker, 0.1 parts co-crosslinker, and 0.5 parts silane coupling agent. After lamination and crosslinking, the film exhibited a light transmittance of 91% within the 400-700 nm range. When applied to HJT modules, the initial power generation increased by 1% compared to a film of the same formulation without the light-conversion powder. However, the module experienced a power loss of 1.3% after damp-heat aging and 1.8% after UV aging.

[0037] Application Example 2

[0038] The light-conversion powder described in Example 2 was applied to a POE photovoltaic film. The film contained, in addition to 100 parts POE resin and 5 parts light-conversion powder, 0.5 parts peroxide crosslinker, 0.1 parts co-crosslinker, and 0.5 parts silane coupling agent. After lamination and crosslinking, the film exhibited a light transmittance of 90% within the 400-700 nm range. When used in a TOPCON module, power generation increased by 2.4% compared to a film of the same formulation without the light-conversion powder. The module exhibited a power loss of 0.3% after damp-heat aging and 1.6% after UV aging.

[0039] Application Example 3

[0040] The light-conversion powder described in Example 3 was applied to an EVA photovoltaic film. The film contained, in addition to 100 parts EVA resin and 1 part light-conversion powder, 0.5 parts peroxide crosslinker, 0.1 parts co-crosslinker, and 0.5 parts silane coupling agent. After lamination and crosslinking, the film exhibited a light transmittance of 91% within the 400-700 nm range. When used in HJT modules, the power gain increased by 2.9% compared to a film of the same formulation without the light-conversion powder. The module also exhibited a power loss of 0.4% after damp-heat aging and 0.9% after UV aging.

[0041] Comparative Example 1

[0042] The light-conversion agent used in Comparative Example 1 was the uncoated organic light-conversion agent used in Example 1. It was applied to an EVA photovoltaic film with the same components as in Application Example 1. After lamination and cross-linking, the film exhibited a light transmittance of 91% in the 400-700 nm range. When used in HJT modules, the module's power generation increased by 1% compared to a film of the same formulation without the light-conversion agent. The module's power generation decreased by 2.1% after damp-heat aging and by 2.9% after UV aging.

[0043] Comparative Example 2

[0044] The light-converting powder used in Comparative Example 2 is composed of a benzotriazole derivative organic light-converting agent and a silicon dioxide ALD coating layer. The particle size D50 of the light-converting agent is 110 μm and the specific surface area is 100 m 2 / g, a silica coating layer thickness of 1 nanometer, and an organic light-conversion agent with the molecular formula of Formula B-2. The light-conversion powder described in Comparative Example 2 was applied to an EVA photovoltaic film, the components of which were the same as those in Application Example 1. After lamination and cross-linking, the film exhibited a light transmittance of 88% in the 400-700 nm range. When used in HJT modules, the initial power generation of the module decreased by 0.2% compared to a film of the same formulation without the light-conversion powder. The module also exhibited a power loss of 1.3% after damp-heat aging and 2.1% after UV aging.

[0045] Comparative Example 3

[0046] The coated light-converting powder is composed of a benzotriazole derivative organic light-converting agent and a silicon dioxide ALD coating layer. The particle size D50 of the light-converting agent is 10 microns and the specific surface area is 10m 2 / g, a silica coating layer with a thickness of 55 nanometers and a molecular formula as shown in Formula B-3, the light-conversion powder described in Comparative Example 3 was applied to an EVA photovoltaic film, the components of which were the same as those in Application Example 1. After lamination and cross-linking, the film exhibited a light transmittance of 89% in the 400-700 nanometer range. When used in HJT modules, the initial power generation of the module was not improved compared to a film of the same formulation without the light-conversion powder. However, the module's power generation decreased by 0.4% after damp-heat aging and by 1.4% after UV aging.

[0047] Comparative Example 4

[0048] Comparative Example 4 used Jinhua Lijin's inorganic light-conversion powder (UV-365) with a particle size (D50) of 10 microns. This light-conversion powder was applied to a POE photovoltaic film with the same components as in Example 2. After lamination and cross-linking, the film exhibited a light transmittance of 88% within the 400-700 nm range. When used in HJT modules, the initial power generation increased by 0.5% compared to a film of the same formulation without the light-conversion powder. However, the module experienced a power loss of 3.4% after damp-heat aging and 5.4% after UV aging.

[0049] Comparative Example 5

[0050] Comparative Example 5 differs from Example 3 in that the specific surface area of the light conversion agent used is 0.09 m 2 / g, the EVA film using the light conversion powder, the EVA film composition is the same as that of Application Example 1, the light transmittance of the film after lamination and crosslinking is 91% in the range of 400-700 nm, and it is used for an HJT module. The initial power generation of the module is increased by 0.3% compared with the same formula film without light conversion powder. The power generation of the module attenuates by 0.7% after humid heat aging, and the power generation attenuates by 2.4% after ultraviolet aging.

[0051] Comparative Example 6

[0052] Comparative Example 6 differs from Example 3 in that the specific surface area of the light conversion agent used is 2100 m 2 / g, the EVA film using the light conversion powder, the EVA film composition is the same as that of Application Example 1, the light transmittance of the film after lamination and crosslinking is 88% in the range of 400-700 nm, and it is used for an HJT module. The initial power generation of the module is increased by 0.3% compared with the same formula film without light conversion powder. The power generation of the module attenuates by 0.7% after humid heat aging, and the power generation attenuates by 2.4% after ultraviolet aging.

[0053] Comparative Example 7

[0054] Comparative Example 7 differs from Application Example 1 in that the weight fraction of the light conversion powder in the EVA film is 5.1 parts. The light transmittance of the film after lamination and crosslinking is 89% in the range of 400-700 nm, and it is used for an HJT module. The initial power generation of the module is increased by 0.2% compared with the same formula film without light conversion powder. The power generation of the module attenuates by 1.4% after humid heat aging, and the power generation attenuates by 2.4% after ultraviolet aging.

[0055] Comparative Example 8

[0056] Comparative Example 8 differs from Application Example 1 in that the weight fraction of the light conversion powder in the EVA film is 0.04 parts. The light transmittance of the film after lamination and crosslinking is 91% in the range of 400-700 nm, and it is used for an HJT module. The initial power generation of the module is increased by 0.3% compared with the same formula film without light conversion powder. The power generation of the module attenuates by 0.7% after humid heat aging, and the power generation attenuates by 2.4% after ultraviolet aging.

[0057] From the data of the examples and comparative examples, it can be seen that the light conversion powder in the present application has good compatibility with the adhesive film, the adhesive film after lamination has good light transmittance in the visible light range, and the power generation efficiency of the photovoltaic module is improved. When the particle size of the light conversion agent is too large or the thickness of the coating layer is too high, the light transmittance of the adhesive film is affected, thereby reducing the power generation efficiency. Without the coating layer, the light conversion agent loses protection, and the resistance to humid heat aging and ultraviolet light is poor. In addition, too large specific surface area of the organic light conversion agent, too long ALD coating time, and too large porosity will affect the light transmittance. Too small specific surface area will reduce the light conversion efficiency.

Claims

1. A photovoltaic adhesive film containing coated light conversion powder, characterized in that: The photovoltaic film uses EVA or POE as a matrix resin, and its light transmittance is greater than 90%. The coated light conversion powder is composed of an organic light conversion agent and an inorganic coating layer. The organic light conversion agent is a benzotriazole derivative, and the inorganic coating layer is obtained by atomic deposition. The benzotriazole derivative is selected from One of them.

2. The photovoltaic adhesive film containing coated light conversion powder according to claim 1, characterized in that: The organic light conversion agent is in granular form, and the particle size D50 is between 10 nanometers and 100 micrometers.

3. The photovoltaic adhesive film containing coated light conversion powder according to claim 1 or 2, characterized in that: The organic light conversion agent is in granular form and has a specific surface area of ​​0.1-2000m 2 / g.

4. The photovoltaic adhesive film containing coated light conversion powder according to claim 3, characterized in that: The thickness of the inorganic coating layer ranges from 1 nanometer to 50 nanometers.

5. The photovoltaic adhesive film containing coated light conversion powder according to claim 4, characterized in that: The inorganic coating layer is one or more of silicon dioxide, zirconium oxide, aluminum oxide, titanium oxide, zinc oxide, magnesium oxide, barium oxide, magnesium fluoride, calcium fluoride, and silicon nitride.

6. The photovoltaic adhesive film containing coated light conversion powder according to claim 5, characterized in that: In the photovoltaic adhesive film, based on 100 parts by weight of EVA or POE resin, the weight of the coated light-converting powder is between 0.05 and 5 parts.

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