Pyramid structure light conversion film layer based on quinoxaline system light conversion material

Abstract

The invention belongs to the field of solar cell materials, and particularly 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 described in the specification. The light conversion film can be used for a solar cell to enhance the cell efficiency. # imgabs0 #

Description

Technical Field

[0001] The invention belongs to the field of solar cell materials, and in particular relates to a pyramid-structured light-conversion film layer based on a quinoxaline system light-conversion material. Background Art

[0002] Photovoltaic technology has developed very rapidly in recent years, completing the technical iteration from BSF to PERC to TOPCON, and the mass production efficiency has also increased from about 18% to about 25%. To further improve the photovoltaic efficiency, HJT or crystalline silicon / perovskite stacking technology is required. However, although this type of battery has high efficiency, there are still some problems with stability. For example, HJT batteries will experience efficiency attenuation under ultraviolet light; and stacked batteries will experience problems such as perovskite layer decomposition under ultraviolet light, causing component failure.

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

[0004] The above solution (1) will result in a decrease in the number of photons transmitted, thereby reducing the working efficiency of the photovoltaic module. The above solution (2) uses a film in which the light-converting agent is dispersed, and the light radiation of the light-converting particles in the film is 360 degrees, and half of the photons will pass through the film and leave the battery. The schematic diagram is as follows: Figure 1 As shown, it will also reduce the working efficiency of photovoltaic modules. Summary of the invention

[0005] In view of the above problems existing in the prior art, the present invention proposes a light-converting film layer based on a quinoxaline system compound (organic compound), and applies it to a crystalline silicon cell. The present invention directly applies the light-converting material to the cell surface having a pyramid structure by means of a coating, and utilizes the light-trapping effect of the structure (such as Figure 2 As shown), the photon utilization rate is improved and the component power is increased.

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

[0007]

[0008] In formula I, Ar is selected from a substituted or unsubstituted C6-C14 arylene group, a substituted or unsubstituted 5-14 membered heteroarylene group having one or more heteroatoms selected from N, O, Se and S;

[0009] The term "substituted" means that one or more hydrogen atoms on the group are replaced by one or more substituents selected from halogen atoms, carboxyl groups, amine groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, nitro groups and azido groups;

[0010] R 1 , R 4 and R 5 Each independently selected from a hydrogen atom, a C1-C20 alkyl group and a functional group represented by formula II In Formula II, n ≥ 2, * represents the linking site to the other parts of the organic compound;

[0011] R 2 and R 3 Each is independently selected from a hydrogen atom, a halogen atom, a C1-C20 alkoxy group, a C1-20 alkylthio group, a carboxyl group, an amine group, an ester group, an amide group, a cyano group, a nitro group and an azide group.

[0012] In one or more embodiments, the organic compound has one or more of the following characteristics:

[0013] Ar is selected from the following functional groups: wherein R is a hydrogen atom, a halogen atom, a carboxyl group, an amine group, an ester group, an amide group, a C1-C10 alkoxy group, a cyano group, a nitro group or an azido group, X is O, S or Se, and the aromatic ring of the functional group has two connection sites for connecting to other parts of the organic compound;

[0014] R 1 , R 4 and R 5 Each is independently selected from a hydrogen atom and a C1-C4 alkyl group;

[0015] R 2 and R 3 A hydrogen atom.

[0016] In one or more embodiments, the organic compound has one or more of the following characteristics:

[0017] Ar is selected from Among them, * indicates the connection site between the benzene ring and the other parts of the organic compound;

[0018] R 1 , R 4 and R 5 Each is independently selected from a hydrogen atom and a C1-C4 alkyl group;

[0019] R 2 and R 3 A hydrogen atom.

[0020] In one or more embodiments, the organic compound is Compound 1, Compound 2, Compound 3, or Compound 4:

[0021]

[0022] In one or more embodiments, the organic compound has an absorption range of 280 to 400 nm and a maximum absorption peak of 320 to 380 nm; and / or

[0023] The photoluminescence range of the organic compound is 400-600nm, and the maximum emission peak is 450-550nm.

[0024] In one or more embodiments, the light conversion adhesive film includes an adhesive film matrix and the organic compound described in any embodiment of the present invention.

[0025] Another aspect of the present invention provides a light-converting film, wherein the material of the light-converting film is the organic compound described in any embodiment of the present invention.

[0026] In one or more embodiments, the light conversion film has a thickness of 10-300 nm.

[0027] Another aspect of the present invention provides a method for preparing the light-converting film described in any embodiment of the present invention, the method comprising: placing the organic compound in a vacuum evaporator for thermal evaporation, so that the organic compound is deposited on the surface of the solar cell to obtain the light-converting film.

[0028] Another aspect of the present invention provides a solar cell assembly, which includes a solar cell and a light conversion adhesive film as described in any embodiment of the present invention or a light conversion film as described in any embodiment of the present invention disposed on at least one surface of the solar cell.

[0029] In one or more embodiments, the solar cell is a crystalline silicon cell, a perovskite cell or a perovskite-crystalline silicon tandem cell.

[0030] In one or more embodiments, the surface of the solar cell in contact with the light conversion adhesive film or the light conversion film is a convex structure.

[0031] In one or more embodiments, the protruding structure is a pyramid structure.

[0032] In one or more embodiments, the base width of the pyramid structure is 0.2 μm-10 μm.

[0033] In one or more embodiments, the height of the pyramid structure is 0.2 μm-10 μm.

[0034] In one or more embodiments, the distance between the pyramid structure units is 0-1 μm.

[0035] In one or more embodiments, the distance between the pyramid structure units is 0 μm. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Explanation of reference numerals:

[0037] a represents the bottom width of the pyramid structure; b represents the height of the pyramid structure; and c represents the spacing between the pyramid structure units.

[0038] Figure 1 This is a schematic diagram of the prior art of transferring light particles and photons through the film to leave the battery.

[0039] Figure 2 It is a schematic diagram of a light-converting film layer on the surface of a battery having a pyramid structure in the present invention.

[0040] Figure 3 It is a three-dimensional structural diagram of the pyramid structure in the present invention.

[0041] Figure 4 The quantum efficiency test results of the crystalline silicon cells prepared in Examples 1-3 and Comparative Examples are shown. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in this document. Unless otherwise specified, all technical and scientific terms used in this document have the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definitions in this specification shall prevail.

[0043] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0044] Herein, “comprising”, “including”, “containing” and similar terms encompass the meanings of “consisting essentially of” and “consisting of”. For example, when “A comprises B and C” is disclosed herein, “A consists essentially of B and C” and “A consists of B and C” should be deemed to be disclosed herein.

[0045] In this article, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are only for brevity and convenience. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0046] In this document, unless otherwise specified, percentage refers to mass percentage and ratio refers to mass ratio.

[0047] Herein, when describing embodiments or examples, it should be understood that they are not used to limit the present invention to these embodiments or examples. On the contrary, all substitutes, improvements and equivalents of the methods and materials described in the present invention can be included in the scope defined by the present invention.

[0048] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0049] In some embodiments, the schematic diagram of the structure position of the light-reflecting film layer in the battery assembly of the present invention is as follows Figure 2 As shown, the light-converting film layer is wrapped around the outer surface of the cell having a pyramid structure and presents the same pyramid structure. The three-dimensional stereogram of the pyramid structure in the present invention is as shown in FIG. Figure 3 shown.

[0050] Organic compounds

[0051] In the present invention, the structure of the organic compound used as the light conversion material is as follows:

[0052]

[0053] In formula I, Ar is selected from a substituted or unsubstituted C6-C14 arylene group, a substituted or unsubstituted 5-14 membered heteroarylene group having one or more heteroatoms selected from N, O, Se and S;

[0054] The term "substituted" means that one or more hydrogen atoms on the group are replaced by one or more substituents selected from halogen atoms, carboxyl groups, amine groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, nitro groups and azido groups;

[0055] R 1 , R 4 and R 5 Each independently selected from a hydrogen atom, a C1-C20 alkyl group and a functional group represented by formula II In Formula II, n ≥ 2, * represents the linking site to the other parts of the organic compound;

[0056] R 2 and R 3 Each is independently selected from a hydrogen atom, a halogen atom, a C1-C20 alkoxy group, a C1-20 alkylthio group, a carboxyl group, an amine group, an ester group, an amide group, a cyano group, a nitro group and an azide group.

[0057] In the present invention, an alkyl group refers to a monovalent saturated group having a straight or branched structure composed of carbon atoms and hydrogen atoms. In the present invention, the number of C before the group represents the number of carbon elements contained in the group, for example, a C1 alkyl group represents an alkyl group containing 1 carbon atom, i.e., a methyl group. The alkyl group applicable to the present invention can be a C1 to C20 alkyl group, for example, a C1 alkyl group, a C2 alkyl group, a C3 alkyl group, a C4 alkyl group, a C5 alkyl group, a C6 alkyl group, a C7 alkyl group, a C8 alkyl group, a C9 alkyl group, a C10 alkyl group, a C11 alkyl group, a C12 alkyl group, a C13 alkyl group, a C14 alkyl group, a C15 alkyl group, a C16 alkyl group, a C17 alkyl group, a C18 alkyl group, a C19 alkyl group, and a C20 alkyl group.

[0058] In the present invention, an alkoxy group refers to an -O-alkyl group.

[0059] In the present invention, an alkylthio group refers to an -S-alkyl group.

[0060] In the present invention, aryl refers to a monovalent group having an aromatic ring structure composed of carbon atoms and hydrogen atoms, and the aryl is connected to other parts of the molecule through the carbon atoms on the aromatic ring. The aryl suitable for the present invention is a C6 aryl, such as phenyl.

[0061] In the present invention, heteroaryl refers to a monovalent group having an aromatic ring structure composed of carbon atoms, hydrogen atoms and heteroatoms (such as sulfur atoms, nitrogen atoms, oxygen atoms), and the heteroaryl is connected to other parts of the molecule through carbon atoms or heteroatoms on the aromatic ring. The heteroaryl suitable for the present invention can be a C5-C6 aryl, such as pyridyl, furyl, thienyl, selenophene or pyrrolyl.

[0062] In the present invention, the alkyl group, alkoxy group, aryl group and heteroaryl group may be substituted by other substituents, including but not limited to halogen atoms, carboxyl groups, amine groups, ester groups, amide groups, alkoxy groups, nitro groups and azido groups.

[0063] In the present invention, the halogen atom includes fluorine, chlorine, bromine and iodine.

[0064] In the present invention, an amine 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.

[0065] In some preferred embodiments,

[0066] Ar is selected from the following functional groups: wherein R is a hydrogen atom, a halogen atom, a carboxyl group, an amine group, an ester group, an amide group, a C1-C10 alkoxy group, a cyano group, a nitro group or an azido group, X is O, S or Se, and the aromatic ring of the functional group has two connection sites for connecting to other parts of the organic compound;

[0067] R 1 , R 4 and R 5 Each is independently selected from a hydrogen atom and a C1-C4 alkyl group, for example, a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a tert-butyl group, an isobutyl group; R 2 and R 3 Each is independently selected from a hydrogen atom.

[0068] In some preferred embodiments,

[0069] Ar is selected from Among them, * indicates the connection site between the benzene ring and the other parts of the organic compound;

[0070] R 1 , R 4 and R 5 Each is independently selected from a hydrogen atom and a C1-C4 alkyl group, for example, a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a tert-butyl group, an isobutyl group; R 2 and R 3 Each is independently selected from a hydrogen atom.

[0071] Compounds 1, 2, 3, and 4

[0072] In some preferred embodiments, the light conversion material of the present invention is selected from compound 4

[0073]

[0074] In the present invention, the hydrogen atom in the organic compound used as the light conversion material may be protium or deuterium.

[0075] In some embodiments, the thickness of the light-converting film layer of the present invention is 10 to 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.

[0076] In some embodiments, the absorption range of the light conversion material is 280 nm to 400 nm, and the maximum absorption peak is 320 to 380 nm.

[0077] In some embodiments, the photoluminescence of the light conversion material is 400-600 nm, and the maximum emission peak is 450-550 nm.

[0078] In some embodiments, the base width of the pyramid structure is 0.2 μm-10 μm, for example 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm.

[0079] In some embodiments, the height of the pyramid structure is 0.2 μm-10 μm, for example 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm.

[0080] In some embodiments, the spacing between the pyramid structure units is 0-1 μm, for example, 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, and preferably 0 μm.

[0081] Preparation method of light conversion film layer

[0082] The light-converting film layer of the present invention can be prepared by the following method:

[0083] Using a crystalline silicon cell as a substrate, the organic compound is placed in a vacuum evaporator for thermal evaporation, so that the organic compound is deposited on the surface of the solar cell to obtain the light-converting film. The surface of the solar cell in contact with the light-converting film preferably has a pyramid structure.

[0084] In some preferred embodiments, the solar cell module includes at least one of the following devices: a PN junction device containing III-V or II-IV group 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 device.

[0085] The present invention uses a quinoxaline-based light-conversion material to make the material and coating both efficient and stable. The present invention has the following beneficial technical effects:

[0086] The present invention can effectively avoid the loss of photons and improve the efficiency of photon utilization by having a cell surface structure adopting a pyramid structure and a light-converting film layer directly covering it, thereby improving the efficiency of cell and ensuring the reliability of the cell; at the same time, by adopting the pyramid structure, the refractive index of the photovoltaic cell surface can be adjusted to achieve an anti-reflection effect.

[0087] The present invention will be described below in the form of specific examples. It should be understood that these examples are illustrative only and are not intended to limit the scope of the present invention. The methods, reagents and materials used in the examples are, unless otherwise stated, conventional methods, reagents and materials in the art. The compounds in the examples can all be purchased through commercial routes.

[0088] Source of compound

[0089] The organic compound and compound 1-4 were prepared by the following method:

[0090] 1 mmol of 1,4-phenyldiboronic acid or its derivative and 2.5 mmol of 4-bromo-quinoxaline or its derivative are dissolved in 10 mL of 1,4-dioxane, and 2 mmol of potassium carbonate and 1 mL of deionized water are added thereto. Then, the reaction system is heated to 95° C. in an environment filled with nitrogen or argon. After reacting for 24 hours, the reaction is cooled to room temperature, quenched with water, extracted with dichloromethane, and dried in rotation. After purification by column chromatography, the target product with the morphology of white or light yellow powder is obtained.

[0091] The results of H NMR of compound 1-4 are as follows:

[0092] Compound 1: 1 H 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).

[0093] 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).

[0094] Compound 3: 1H 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).

[0095] 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).

[0096] The bottom width of the pyramid structure on the surface of the silicon crystal cell used as the substrate in Examples 1-4 and Comparative Example 1 is 4.6 μm, the height is 4 μm, and the spacing between the pyramid structure units is 0.

[0097] Example 1

[0098] In this embodiment, a crystalline silicon cell with a pyramid structure is used as a substrate. As the light-converting material, it is placed in a vacuum evaporator, evacuated, and the pressure is maintained at less than 10 -4 Pa, heating evaporation was performed by means of resistance wire heating, and the evaporation rate was controlled to be about 1nm / s, so that compound 1 was deposited on the pyramid structure surface of the crystalline silicon cell to form a light-converting film with a thickness of 150nm.

[0099] Example 2

[0100] In this embodiment, a crystalline silicon cell with a pyramid structure is used as a substrate. As the light-converting material, it is placed in a vacuum evaporator, evacuated, and the pressure is maintained at less than 10 -4 Pa, heating evaporation is performed by using a resistance wire heating method, and the evaporation rate is controlled to be about 1nm / s, so that compound 2 is deposited on the pyramid structure surface of the crystalline silicon cell to form a light-converting film with a thickness of 150nm.

[0101] Example 3

[0102] In this embodiment, a crystalline silicon cell with a pyramid structure is used as a substrate. As the light-converting material, it is placed in a vacuum evaporator, evacuated, and the pressure is maintained at less than 10 -4 Pa, heating evaporation was performed by means of resistance wire heating, and the evaporation rate was controlled to be about 1nm / s, so that compound 3 was deposited on the pyramid structure surface of the crystalline silicon cell to form a light-converting film with a thickness of 150nm.

[0103] Example 4

[0104] In this embodiment, a crystalline silicon cell with a pyramid structure is used as a substrate. As the light-converting material, it is placed in a vacuum evaporator, evacuated, and the pressure is maintained at less than 10 -4 Pa, heating evaporation was performed by means of resistance wire heating, and the evaporation rate was controlled to be about 1nm / s, so that compound 3 was deposited on the pyramid structure surface of the crystalline silicon cell to form a light-converting film with a thickness of 150nm.

[0105] Comparative Example 1

[0106] In this embodiment, a crystalline silicon cell with a pyramid structure is used as a substrate, and a 329 cut-off agent (329 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole) is placed in a vacuum evaporation machine as a light conversion material, and a vacuum is drawn to maintain a pressure of less than 10 -4 Pa, heating evaporation was performed by means of resistance wire heating, and the evaporation rate was controlled to be about 1nm / s, so that compound 3 was deposited on the pyramid structure surface of the crystalline silicon cell to form a light-converting film with a thickness of 150nm.

[0107] Test Case

[0108] The cells in Examples 1-4 and Comparative Example 1 were tested for quantum efficiency according to the "Quantum Efficiency Test Method for Tandem Solar Cells" formulated by the Expert Group of the China Electrical Equipment Industry Association (NEA / WG22). The test was completed by the BrightEnergy QE-RX. The test results are as follows: Figure 4 As shown. Figure 4 It can be seen that the conversion bands and efficiencies of Examples 1-4 and the comparative example are poor in ultraviolet cutoff of Examples 1 and 2, good cutoff of Example 3 but poor conversion capability, and Example 4 can achieve both cutoff and conversion. However, the battery quantum efficiency of Examples 1-4 is better than that of 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 a substituted or unsubstituted C6-C14 arylene group, a substituted or unsubstituted 5-14 membered heteroarylene group having one or more heteroatoms selected from N, O, Se and S; The term "substituted" means that one or more hydrogen atoms on the group are replaced by one or more substituents selected from halogen atoms, carboxyl groups, amine groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, nitro groups and azido groups; R1, R4 and R5 are each independently selected from a hydrogen atom, a C1-C20 alkyl group and a functional group represented by formula II In Formula II, n ≥ 2, * represents the linking site to the other parts of the organic compound; R2 and R3 are each independently selected from a hydrogen atom, a halogen atom, a C1-C20 alkoxy group, a C1-20 alkylthio group, a carboxyl group, an amine group, an ester group, an amide group, a cyano group, a nitro group and an azido group.

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, a halogen atom, a carboxyl group, an amine group, an ester group, an amide group, a C1-C10 alkoxy group, a cyano group, a nitro group or an azido group, X is O, S or Se, and the aromatic ring of the functional group has two connection sites for connecting to other parts of the organic compound; R1, R4 and R5 are each independently selected from a hydrogen atom and a C1-C4 alkyl group; 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 is selected from Among them, * indicates the connection site between the benzene ring and the other parts of the organic compound; R1, R4 and R5 are each independently selected from a hydrogen atom and a C1-C4 alkyl group; 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 to 400 nm and a maximum absorption peak of 320 to 380 nm; and / or The photoluminescence range of the organic compound is 400-600nm, and the maximum emission peak is 450-550nm.

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

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

8. The light-converting film according to claim 7, characterized in that: The thickness of the light conversion film is 10-300nm.

9. A method for preparing the light-converting film according to claim 7 or 8, characterized in that: The method comprises: placing the organic compound in a vacuum evaporator 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 according to claim 9, characterized in that The surface of the solar cell in contact with the light conversion film has a convex structure.

11. A solar cell module, characterized in that: The solar cell assembly comprises a solar cell and the light conversion adhesive film according to claim 6 or the light conversion film according to claim 7 or 8 arranged on at least one surface of the solar cell.

12. The solar cell assembly according to claim 11, wherein: The solar cell is a crystalline silicon cell, a perovskite cell or a perovskite-crystalline silicon stacked cell.

13. The solar cell assembly according to claim 11, wherein: The surface of the solar cell in contact with the light-converting adhesive film or the light-converting film is a convex structure.

14. The solar cell assembly according to claim 13, wherein: The protruding structure is a pyramid structure.

15. The solar cell assembly according to claim 14, wherein: The pyramid structure has one or more of the following features: The bottom width of the pyramid structure is 0.2 μm-10 μm; The height of the pyramid structure is 0.2 μm-10 μm; The distance between the pyramid structure units is 0-1 μm.

16. The solar cell assembly according to claim 15, characterized in that The distance between the pyramid structure units is 0 μm.

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