Pyramid-structured light conversion film layer made of light conversion material based on quinoxaline system

Abstract

The present invention belongs to the field of solar cell materials, and specifically relates to an organic compound, a light conversion film comprising the organic compound, and a solar cell comprising the light conversion film. The organic compound is a light conversion material based on a quinoxaline system. The definition of each group in the organic compound is as described in the specification. The light conversion film of the present invention can be used in a solar cell to enhance the cell efficiency.

Description

A pyramid-structured light-converting film based on quinoxaline-based light-converting materials Technical Field

[0001] This invention belongs to the field of solar cell materials, specifically relating to a pyramid-structured light-converting film based on a quinoxaline system light-converting material. Background Technology

[0002] Photovoltaic technology has developed rapidly in recent years, completing technological iterations from BSF to PERC to TOPCON, and mass production efficiency has increased from around 18% to around 25%. Further improvements in photovoltaic efficiency require the use of HJT or crystalline silicon / perovskite tandem technology. However, although these types of cells are highly efficient, they still have some stability issues. For example, HJT cells experience efficiency degradation under ultraviolet radiation; while tandem cells suffer from perovskite layer decomposition under ultraviolet radiation, leading to module failure.

[0003] To address the above issues, the existing technical solutions are: (1) using an ultraviolet cutoff film to prevent ultraviolet light from directly irradiating the battery; (2) using an ultraviolet light conversion film to convert ultraviolet light into visible light, thereby reducing the degree of battery efficiency decline while ensuring stability.

[0004] The above scheme (1) will reduce the number of photons transmitted, thus reducing the working efficiency of the photovoltaic module; the above scheme (2) uses a film in which the light conversion agent is dispersed, and the light radiation of the light conversion particles in the film is 360 degrees, of which half of the photons will leave the cell through the film, as shown in Figure 1. This will also reduce the working efficiency of the photovoltaic module. Summary of the Invention

[0005] To address the aforementioned problems in existing technologies, this invention proposes a light-converting film based on quinoxaline system compounds (organic compounds) and applies it to crystalline silicon solar cells. This invention directly employs a coating method, applying the light-converting material directly to the surface of the cell with a pyramidal structure. Utilizing the light-trapping effect of this structure (as shown in Figure 2), photon utilization is improved, thereby increasing module power.

[0006] Specifically, one aspect of the present invention provides an organic compound:

[0007] In Formula I, Ar is selected from substituted or unsubstituted C6-C14 arylene groups, or substituted or unsubstituted 5-14 heteroarylene groups having one or more heteroatoms selected from N, O, Se and S.

[0008] The term "substitution" refers to the substitution of one or more hydrogen atoms on a group by one or more substituents selected from halogen, carboxyl, amino, ester, amide, C1-C10 alkoxy, cyano, nitro and azide groups;

[0009] R1, R4, and R5 are each independently selected from hydrogen atoms, C1-C20 alkyl groups, and the functional group shown in Formula II. In Formula II, n≥2, and * indicates a connection site that is connected to other parts of the organic compound;

[0010] R2 and R3 are each independently selected from hydrogen atoms, halogen atoms, C1-C20 alkoxy groups, C1-20 alkylthio groups, carboxyl groups, amino groups, ester groups, amide groups, cyano groups, nitro groups, and azide groups.

[0011] In one or more embodiments, the organic compound has one or more of the following characteristics:

[0012] Ar is selected from the following functional groups: Wherein, R is a hydrogen atom, halogen atom, carboxyl group, amino group, ester group, amide group, C1-C10 alkoxy group, cyano group, nitro group or azide group, and X is O, S or Se. The aromatic ring of the functional group has two connection sites that are connected to other parts of the organic compound.

[0013] R1, R4, and R5 are each independently selected from hydrogen atoms and C1-C4 alkyl groups;

[0014] R2 and R3 are hydrogen atoms.

[0015] In one or more embodiments, the organic compound has one or more of the following characteristics:

[0016] Ar selected Wherein, * indicates the connection site where the benzene ring is connected to other parts of the organic compound;

[0017] R1, R4, and R5 are each independently selected from hydrogen atoms and C1-C4 alkyl groups;

[0018] R2 and R3 are hydrogen atoms.

[0019] In one or more embodiments, the organic compound is compound 1, compound 2, compound 3, or compound 4:

[0020] In one or more embodiments, the organic compound has an absorption range of 280–400 nm and a maximum absorption peak of 320–380 nm; and / or

[0021] The photoluminescence range of the organic compound is 400–600 nm, and the maximum emission peak is 450–550 nm.

[0022] In one or more embodiments, the light-converting film comprises a film matrix and an organic compound as described in any of the embodiments herein.

[0023] Another aspect of the present invention provides a light-converting film, wherein the material of the light-converting film is an organic compound as described in any embodiment herein.

[0024] In one or more embodiments, the thickness of the light-converting film is 10-300 nm.

[0025] Another aspect of the present invention provides a method for preparing the light-converting film according to any embodiment herein, the method comprising: placing the organic compound in a vacuum evaporation machine for thermal evaporation, thereby depositing the organic compound onto the surface of a solar cell to obtain the light-converting film.

[0026] Another aspect of the present invention provides a solar cell module comprising a solar cell and a light-converting adhesive film or a light-converting film as described in any embodiment herein disposed on at least one surface of the solar cell.

[0027] In one or more embodiments, the solar cell is a crystalline silicon cell, a perovskite cell, or a perovskite-crystalline silicon tandem cell.

[0028] In one or more embodiments, the surface of the solar cell that contacts the light-converting adhesive film or the light-converting film has a raised structure.

[0029] In one or more embodiments, the protrusion structure is a pyramid structure.

[0030] In one or more embodiments, the base width of the pyramid structure is 0.2 μm-10 μm.

[0031] In one or more embodiments, the height of the pyramid structure is 0.2 μm-10 μm.

[0032] In one or more embodiments, the spacing between the pyramid structural units is 0-1 μm.

[0033] In one or more embodiments, the spacing between the pyramid structural units is 0 μm. Attached Figure Description

[0034] Explanation of reference numerals in the attached diagram: a represents the width of the base of the pyramid structure; b represents the height of the pyramid structure; c represents the spacing between the pyramid structure units.

[0035] Figure 1 is a schematic diagram of how photons of transferred light particles leave the battery through the film in the prior art.

[0036] Figure 2 is a schematic diagram of the light-converting film layer on the surface of the battery with a pyramid structure in this invention.

[0037] Figure 3 is a three-dimensional structural diagram of the pyramid structure in this invention.

[0038] Figure 4 shows the quantum efficiency test results of the crystalline silicon solar cells prepared in Examples 1-3 and the comparative examples. Detailed Implementation

[0039] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used herein are explained and defined in general terms below. Unless otherwise specified, all technical and scientific terms used herein have the common meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0040] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0041] In this document, the terms “contains,” “includes,” “containing,” and similar terms encompass the meanings of “basically composed of” and “composed of.” For example, when this document discloses “A contains B and C,” “A is basically composed of B and C” and “A is composed of B and C” should be considered as having been disclosed in this document.

[0042] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0043] Unless otherwise specified, percentages refer to mass percentages and proportions refer to mass ratios in this article.

[0044] In this document, when describing embodiments or examples, it should be understood that it is not intended to limit the invention to those embodiments or examples. Rather, all alternatives, modifications, and equivalents of the methods and materials described herein are covered within the scope defined by this invention.

[0045] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0046] In some embodiments, the structural location of the light-converting film layer in the battery module of the present invention is shown in Figure 2. The light-converting film layer wraps around the outer surface of the battery cell with a pyramid structure and presents the same pyramid structure. The three-dimensional view of the pyramid structure in the present invention is shown in Figure 3.

[0047] organic compounds

[0048] In this invention, the structure of the organic compound used as the light-converting material is shown below:

[0049] In Formula I, Ar is selected from substituted or unsubstituted C6-C14 arylene groups, or substituted or unsubstituted 5-14 heteroarylene groups having one or more heteroatoms selected from N, O, Se and S.

[0050] The term "substitution" refers to the substitution of one or more hydrogen atoms on a group by one or more substituents selected from halogen, carboxyl, amino, ester, amide, C1-C10 alkoxy, cyano, nitro and azide groups;

[0051] R1, R4, and R5 are each independently selected from hydrogen atoms, C1-C20 alkyl groups, and the functional group shown in Formula II. In Formula II, n≥2, and * indicates a connection site that is connected to other parts of the organic compound;

[0052] R2 and R3 are each independently selected from hydrogen atoms, halogen atoms, C1-C20 alkoxy groups, C1-20 alkylthio groups, carboxyl groups, amino groups, ester groups, amide groups, cyano groups, nitro groups, and azide groups.

[0053] In this invention, alkyl refers to a monovalent saturated group composed of carbon atoms and hydrogen atoms, having a straight-chain or branched structure. In this invention, the number of carbon atoms preceding the group indicates the number of carbon atoms contained in the group; for example, C1 alkyl represents an alkyl group containing one carbon atom, i.e., methyl. Alkyl groups suitable for this invention can be C1 to C20 alkyl groups, such as C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl, C7 alkyl, C8 alkyl, C9 alkyl, C10 alkyl, C11 alkyl, C12 alkyl, C13 alkyl, C14 alkyl, C15 alkyl, C16 alkyl, C17 alkyl, C18 alkyl, C19 alkyl, and C20 alkyl.

[0054] In this invention, alkoxy refers to -O-alkyl.

[0055] In this invention, alkylthio group refers to -S-alkyl group.

[0056] In this invention, an aryl group refers to a monovalent group with an aromatic ring structure composed of carbon and hydrogen atoms, and the aryl group is connected to other parts of the molecule through the carbon atom on the aromatic ring. The aryl group suitable for this invention is a C6 aryl group, such as a phenyl group.

[0057] In this invention, a heteroaryl group refers to a monovalent group with an aromatic ring structure composed of carbon atoms, hydrogen atoms, and heteroatoms (e.g., sulfur atoms, nitrogen atoms, and oxygen atoms), and the heteroaryl group is connected to other parts of the molecule through carbon atoms or heteroatoms on the aromatic ring. The heteroaryl groups suitable for this invention can be C5-C6 aryl groups, such as pyridyl, furanyl, thiophenyl, selenophenyl, or pyrroleyl.

[0058] In this invention, alkyl, alkoxy, aryl, and heteroaryl groups can be substituted by other substituents, including but not limited to halogen atoms, carboxyl groups, amino groups, ester groups, amide groups, alkoxy groups, nitro groups, and azide groups.

[0059] In this invention, halogen atoms include fluorine, chlorine, bromine, and iodine.

[0060] In this invention, the amino group refers to -NR. a R b R a and R b Each is independently selected from H, C1-C10 alkyl, C2-C10 alkenyl, and C2-C10 alkynyl.

[0061] In some preferred embodiments,

[0062] Ar is selected from the following functional groups: Wherein, R is a hydrogen atom, halogen atom, carboxyl group, amino group, ester group, amide group, C1-C10 alkoxy group, cyano group, nitro group or azide group, and X is O, S or Se. The aromatic ring of the functional group has two connection sites that are connected to other parts of the organic compound.

[0063] R1, R4, and R5 are each independently selected from hydrogen atoms and C1-C4 alkyl groups, such as methyl, ethyl, n-propyl, isopropyl, tert-butyl, and isobutyl; R2 and R3 are each independently selected from hydrogen atoms.

[0064] In some preferred embodiments,

[0065] Ar selected Wherein, * indicates the connection site where the benzene ring is connected to other parts of the organic compound;

[0066] R1, R4, and R5 are each independently selected from hydrogen atoms and C1-C4 alkyl groups, such as methyl, ethyl, n-propyl, isopropyl, tert-butyl, and isobutyl; R2 and R3 are each independently selected from hydrogen atoms.

[0067] Compounds 1, 2, 3, 4

[0068] In some preferred embodiments, the light-converting material of the present invention is selected from compound 4.

[0069] In this invention, the hydrogen atoms in the organic compound used as the light-converting material can be protium or deuterium.

[0070] In some embodiments, the thickness of the light-converting film layer of the present invention is 10–300 nm, for example 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm, 110 nm, 120 nm, 130 nm, 140 nm, 150 nm, 160 nm, 170 nm, 180 nm, 190 nm, 200 nm, 210 nm, 220 nm, 230 nm, 240 nm, 250 nm, 260 nm, 270 nm, 280 nm, and 290 nm.

[0071] In some implementations, the absorption range of the light-converting material is 280 nm to 400 nm, and the maximum absorption peak is 320 to 380 nm.

[0072] In some implementations, the photoluminescence of the light-converting material is 400–600 nm, and the maximum emission peak is 450–550 nm.

[0073] In some implementations, the base width of the pyramid structure is 0.2μm-10μm, for example 0.3μm, 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm.

[0074] In some implementations, the height of the pyramid structure is 0.2μm-10μm, for example 0.3μm, 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm.

[0075] In some implementations, the spacing between the pyramid structural units is 0-1 μm, such as 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, preferably 0 μm.

[0076] Preparation method of light conversion film

[0077] The light-converting film layer of the present invention can be prepared by the following method:

[0078] Using a crystalline silicon cell as a substrate, the organic compound is placed in a vacuum evaporation machine for thermal evaporation, causing the organic compound to be deposited onto the surface of the solar cell to obtain the light conversion film. Preferably, the surface of the solar cell in contact with the light conversion film has a pyramid structure.

[0079] In some preferred embodiments, the solar cell module includes at least one of the following devices: a PN junction device containing group III-V or II-IV elements, a Cu-In-Ga-Se (CIGS) thin film device, an organic sensitizer device, an organic thin film device, a quantum dot thin film device, an amorphous silicon solar cell, a microcrystalline silicon solar cell, and a crystalline silicon solar cell device.

[0080] This invention utilizes quinoxaline-based light-converting materials to achieve both high efficiency and stability in both the material and the coating. This invention offers the following beneficial technical effects:

[0081] This invention, through a battery surface structure with a pyramidal structure and a light-converting film layer directly covering it, can effectively avoid photon loss, improve photon utilization efficiency, and enhance battery efficiency while ensuring battery reliability. At the same time, by adopting a pyramidal structure, the refractive index of the photovoltaic cell surface can also be adjusted to achieve an anti-reflection effect.

[0082] The present invention will be described below by way of specific embodiments. It should be understood that these embodiments are merely illustrative and are not intended to limit the scope of the invention. The methods, reagents, and materials used in the embodiments are conventional methods, reagents, and materials in the art, unless otherwise stated. The compounds in the embodiments are all commercially available.

[0083] Source of compounds

[0084] Organic compounds and compounds 1-4 were prepared by the following method:

[0085] 1 mmol of 1,4-phenyldiboronic acid or its derivative and 2.5 mmol of 4-bromo-quinoxaline or its derivative were dissolved in 10 mL of 1,4-dioxane. 2 mmol of potassium carbonate and 1 mL of deionized water were added to the mixture. The reaction system was then heated to 95 °C in a nitrogen or argon atmosphere. After reacting for 24 hours, the mixture was cooled to room temperature, quenched with water, extracted with dichloromethane, evaporated to dryness, and purified by column chromatography to obtain the target product as a white or pale yellow powder.

[0086] The 1H NMR spectra of compounds 1-4 are as follows:

[0087] Compound 1: 1H NMR (500MHz, Chloroform-d) δ7.98 (dd, J=8.3, 1.2Hz, 1H), 7.89 (dd, J=9.1, 1.2Hz, 1H), 7.70 (dd, J=9.0, 8.2H z, 0H), 3.86 (s, 1H), 2.82 (dd, J=11.9, 7.8Hz, 2H), 2.13 (dp, J=15.0, 7.4Hz, 1H), 0.93 (dd, J=7.3, 1.1Hz, 6H).

[0088] Compound 2: 1 H NMR (500MHz, Chloroform-d) δ7.94-7.84 (m, 1H), 2.98 (qd, J=7.7, 0.8Hz, 1H), 2.81 (d, J=7. 7Hz, 2H), 2.13 (dp, J=15.0, 7.4Hz, 1H), 1.29 (t, J=7.7Hz, 2H), 0.93 (dd, J=7.3, 1.1Hz, 6H).

[0089] Compound 3: 1 H NMR (500MHz, Chloroform-d) δ7.86 (dd, J=9.6, 1.9Hz, 0H), 7.71 (dd, J=12.1, 4.6Hz, 1H), 7.54 (dt, J=9.6, 0.8Hz, 0H), 2.98 (q d, J=7.7, 0.8Hz, 1H), 2.81 (d, J=7.7Hz, 2H), 2.13 (dp, J=15.0, 7.4Hz, 1H), 1.29 (t, J=7.7Hz, 2H), 0.93 (dd, J=7.3, 1.1Hz, 6H).

[0090] Compound 4: 1 H NMR (500MHz, Chloroform-d) δ8.08 (dd, J=8.7, 1.2Hz, 1H), 7.97 (dd, J=8.3, 1.2Hz, 1H), 7.89 (s, 1H), 7.7 8-7.71 (m, 1H), 2.82 (dd, J=11.9, 7.8Hz, 3H), 2.13 (dp, J=15.0, 7.4Hz, 2H), 0.93 (dd, J=7.3, 1.1Hz, 10H).

[0091] In Examples 1-4 and Comparative Example 1, the pyramid structure on the surface of the silicon crystal cell used as the substrate has a bottom width of 4.6 μm, a height of 4 μm, and a spacing of 0 between the pyramid structure units.

[0092] Example 1

[0093] This embodiment uses a crystalline silicon solar cell with a pyramidal structure as a substrate, and compound 1 is applied. As a light-converting material, it is placed in a vacuum evaporation machine, and a vacuum is drawn to maintain a pressure of less than 10. -4 At Pa, heating and evaporation were carried out using resistance wire heating, with the evaporation rate controlled at approximately 1 nm / s, so that compound 1 was deposited on the pyramidal structure surface of the crystalline silicon cell, forming a light conversion film with a thickness of 150 nm.

[0094] Example 2

[0095] This embodiment uses a crystalline silicon solar cell with a pyramidal structure as a substrate, and compound 2 As a light-converting material, it is placed in a vacuum evaporation machine, and a vacuum is drawn to maintain a pressure of less than 10. -4 At Pa, heating and evaporation were carried out using resistance wire heating, with the evaporation rate controlled at approximately 1 nm / s, so that compound 2 was deposited on the pyramidal structure surface of the crystalline silicon cell, forming a light conversion film with a thickness of 150 nm.

[0096] Example 3

[0097] This embodiment uses a crystalline silicon solar cell with a pyramidal structure as a substrate, and compound 3 is applied. As a light-converting material, it is placed in a vacuum evaporation machine, and a vacuum is drawn to maintain a pressure of less than 10. -4 At Pa, heating and evaporation were carried out using resistance wire heating, with the evaporation rate controlled at approximately 1 nm / s, so that compound 3 was deposited on the pyramidal structure surface of the crystalline silicon cell, forming a light conversion film with a thickness of 150 nm.

[0098] Example 4

[0099] This embodiment uses a crystalline silicon cell with a pyramidal structure as a substrate, and compound 4 As a light-converting material, it is placed in a vacuum evaporation machine, and a vacuum is drawn to maintain a pressure of less than 10. -4 At Pa, heating and evaporation were carried out using resistance wire heating, with the evaporation rate controlled at approximately 1 nm / s, so that compound 3 was deposited on the pyramidal structure surface of the crystalline silicon cell, forming a light conversion film with a thickness of 150 nm.

[0100] Comparative Example 1

[0101] In this embodiment, a crystalline silicon solar cell with a pyramidal structure is used as the substrate. A 329 cutoff agent (3292-(2′-hydroxy-5′-tert-octylphenyl)benzotriazole) is placed in a vacuum evaporation machine as the light-converting material, and a vacuum is applied, maintaining a pressure less than 10 kJ / m³. -4At Pa, heating and evaporation were carried out using resistance wire heating, with the evaporation rate controlled at approximately 1 nm / s, so that compound 3 was deposited on the pyramidal structure surface of the crystalline silicon cell, forming a light conversion film with a thickness of 150 nm.

[0102] Test case

[0103] The cells in Examples 1-4 and Comparative Example 1 were tested for quantum efficiency according to the "Test Method for Quantum Efficiency of Tandem Solar Cells" formulated by the expert group of the China Electrical Equipment Industry Association (NEA / WG22). The tests were performed using a Guangyan QE-RX, and the results are shown in Figure 4. Figure 4 shows the light conversion bands and efficiencies of Examples 1-4 and the Comparative Example. Examples 1 and 2 have poor ultraviolet cutoff, Example 3 has good cutoff but poor conversion capability, and Example 4 combines both cutoff and conversion. However, the quantum efficiencies of the cells in Examples 1-4 are all better than those in Comparative Example 1.

Claims

1. An organic compound, characterized in that, The structure of the organic compound is shown in Formula I: In Formula I, Ar is selected from substituted or unsubstituted C6-C14 arylene groups, or substituted or unsubstituted 5-14 heteroarylene groups having one or more heteroatoms selected from N, O, Se and S. The term "substitution" refers to the substitution of one or more hydrogen atoms on a group by one or more substituents selected from halogen, carboxyl, amino, ester, amide, C1-C10 alkoxy, cyano, nitro and azide groups; R1, R4, and R5 are each independently selected from hydrogen atoms, C1-C20 alkyl groups, and the functional group shown in Formula II. In Formula II, n≥2, and * indicates a connection site that is connected to other parts of the organic compound; R2 and R3 are each independently selected from hydrogen atoms, halogen atoms, C1-C20 alkoxy groups, C1-20 alkylthio groups, carboxyl groups, amino groups, ester groups, amide groups, cyano groups, nitro groups, and azide groups.

2. The organic compound according to claim 1, characterized in that, The organic compound has one or more of the following characteristics: Ar is selected from the following functional groups: Wherein, R is a hydrogen atom, halogen atom, carboxyl group, amino group, ester group, amide group, C1-C10 alkoxy group, cyano group, nitro group or azide group, and X is O, S or Se. The aromatic ring of the functional group has two connection sites that are connected to other parts of the organic compound. R1, R4, and R5 are each independently selected from hydrogen atoms and C1-C4 alkyl groups; R2 and R3 are hydrogen atoms.

3. The organic compound according to claim 1, characterized in that, The organic compound has one or more of the following characteristics: Ar selected Wherein, * indicates the connection site where the benzene ring is connected to other parts of the organic compound; R1, R4, and R5 are each independently selected from hydrogen atoms and C1-C4 alkyl groups; R2 and R3 are hydrogen atoms.

4. The organic compound according to claim 1, characterized in that, The organic compound is compound 1, compound 2, compound 3, or compound 4:

5. The organic compound according to claim 1, characterized in that, The organic compound has an absorption range of 280–400 nm, with a maximum absorption peak at 320–380 nm; and / or The photoluminescence range of the organic compound is 400–600 nm, and the maximum emission peak is 450–550 nm.

6. A light-converting adhesive film, characterized in that, The light-converting film comprises a film matrix and an organic compound according to any one of claims 1-5.

7. A light-converting film, characterized in that, The material of the light-converting film is an organic compound as described in any one of claims 1-5.

8. The light-converting film as described in claim 7, characterized in that, The thickness of the light-converting film is 10-300 nm.

9. A method for preparing the light-converting film according to claim 7 or 8, characterized in that, The method includes: placing the organic compound in a vacuum evaporation machine for thermal evaporation, so that the organic compound is deposited on the surface of the solar cell to obtain the light conversion film.

10. The method as described in claim 9, characterized in that, The surface of the solar cell that contacts the light conversion film has a raised structure.

11. A solar cell module, characterized in that, The solar cell module includes a solar cell and a light-converting film as described in claim 6 or a light-converting film as described in claim 7 or 8 disposed on at least one surface of the solar cell.

12. The solar cell module as described in claim 11, characterized in that, The solar cell is a crystalline silicon cell, a perovskite cell, or a perovskite-crystalline silicon tandem cell.

13. The solar cell module as described in claim 11, characterized in that, The surface of the solar cell that contacts the light-converting adhesive film or the light-converting film has a raised structure.

14. The solar cell module as described in claim 13, characterized in that, The protruding structure is a pyramid structure.

15. The solar cell module as described in claim 14, characterized in that, The pyramid structure has one or more of the following characteristics: The width of the base of the pyramid structure is 0.2μm-10μm; The height of the pyramid structure is 0.2μm-10μm; The spacing between the pyramid structural units is 0-1 μm.

16. The solar cell module as claimed in claim 15, characterized in that, The spacing between the pyramid structural units is 0 μm.

Images