Light conversion agent and preparation method thereof, light conversion adhesive film and HJT vertically-installed photovoltaic module

Abstract

The invention relates to the technical field of photovoltaic materials, in particular to a light conversion agent, a preparation method of the light conversion agent, a light conversion adhesive film and an HJT vertically-installed photovoltaic module. The structure of the light conversion agent is as follows: benzothiophene is grafted to the fifth position of a benzotriazole parent benzene ring of a benzotriazole light conversion material, and chlorobenzene is grafted to the sixth position of the benzotriazole parent benzene ring of the benzotriazole light conversion material; through the molecular structure design of the light conversion agent, the light emitting deviation angle is regulated and controlled, the light emitting uniformity is improved, and through the synergistic effect of reducing total reflection loss through directional light emitting and reducing gap loss through uniform light emitting, the generating capacity of the HJT vertically-installed photovoltaic module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic materials, in particular to a light conversion agent, a preparation method thereof, a light conversion adhesive film and an HJT vertically installed photovoltaic module. BACKGROUND

[0002] In the scenario application of HJT (heterojunction) photovoltaic modules, the vertical installation scheme is becoming the core direction of recent large-scale expansion due to its unique advantages. Compared with traditional inclined installation, the vertical installation scheme has the characteristics of high land utilization rate, easy integration with building facades or road fences and the like, and the surface is not easy to accumulate dust and snow; it is especially suitable for agricultural photovoltaic complementary, photovoltaic fence, building integrated photovoltaic (BIPV) and the like. As a key functional material matching the characteristics of HJT cells and further amplifying the advantages of vertical installation, the performance of the light conversion agent directly affects the power generation gain and scenario adaptability of the module. At present, the light conversion agent mainly includes organic fluorescent pigments, rare earth organic complexes, rare earth inorganic compounds, CdSe quantum dots and perovskite quantum dots.

[0003] It should be noted that the power generation of the HJT photovoltaic module is usually lower than that of the inclined installation mode when it is vertically installed, which is mainly due to the structural difference of the light angle. In most periods (such as morning, afternoon and winter), the angle between the solar height and the normal of the vertical surface is large, and the direct light is mainly incident in the form of "oblique incidence", which leads to the reduction of the effective light receiving area, and the reflection loss of the light at the interface between the glass and the adhesive film of the module also increases accordingly. In addition, the proportion of invalid light directed to the glass-air interface after the large-angle oblique light under vertical installation is converted by the light conversion agent can reach more than 45%, and the total invalid light loss is significantly higher than that of the inclined installation mode due to the total reflection loss between the glass and the air interface.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] The first object of the present application is to provide a light conversion agent. Through the molecular structure design, the 5-position benzothiophene substitution and the 6-position chlorobenzene substitution on the benzene ring of the benzotriazole parent body are adjusted to control the light emission deviation angle and improve the light emission uniformity. Through the synergistic effect of directional light emission to reduce total reflection loss and uniform light emission to reduce gap loss, the power generation of the HJT vertically installed photovoltaic module is improved.

[0006] The second object of the present application is to provide a preparation method of the light conversion agent.

[0007] The third object of the present application is to provide a light conversion adhesive film.

[0008] The fourth object of the present application is to provide an HJT vertically installed photovoltaic module.

[0009] In order to achieve the above object of the present application, the following technical solutions are adopted: The present application provides a photoconversion agent, comprising at least one of compounds having structures as shown in formula (I); (I); wherein R1, R2 and R3 are each independently any one of hydrogen, substituted or unsubstituted anilino.

[0010] Further, the photoconversion agent comprises one or both of compounds having structures as shown in formula (II) and formula (III); (II); (III).

[0011] The present application also provides a preparation method of the photoconversion agent as described above, comprising the following steps: S1, performing a first reaction on compound A and N-iodosuccinimide to obtain intermediate 1; performing a second reaction on the intermediate 1 and N-bromosuccinimide to obtain intermediate 2; The structural general formula of the compound A is ; wherein R1, R2 and R3 are each independently any one of hydrogen, substituted or unsubstituted anilino. S2, performing a third reaction on the intermediate 2 and benzothiophene borate to obtain intermediate 3; S3, performing a fourth reaction on the intermediate 3 and chlorobenzene borate to obtain the photoconversion agent.

[0012] Further, in step S1, the compound A comprises one or both of compounds having structures as shown in formula (IV) and formula (V); (IV); (V).

[0013] Further, in step S1, at least one of the following features (1) to (4) is included; (1) the mass ratio of the compound A and the N-iodosuccinimide is 100:20-50; (2) the first reaction comprises: reacting at-5-10℃ for 0.5-2h; (3) the mass ratio of the intermediate 1 and the N-bromosuccinimide is 100:20-50; (4) the second reaction comprises: reacting at 20-30℃ for 2-4h.

[0014] Further, in step S2, the mass ratio of the intermediate 2 and the benzothiophene borate is 100:40-70; And / or, the third reaction includes: reacting at 80-100 DEG C for 4-6h.

[0015] Further, in step S3, the mass ratio of the intermediate 3 and the chlorobenzene borate is 100:40-70; And / or, the fourth reaction includes: reacting at 90-110 DEG C for 5-7h.

[0016] The application also provides a light conversion film, comprising the light conversion agent as described above.

[0017] Further, the light conversion film comprises the following components in terms of mass fraction: 100 parts of base resin, 0.5-1.5 parts of crosslinking agent, 0.1-1 part of auxiliary crosslinking agent, 0.1-0.5 part of antioxidant, 0.1-1 part of light stabilizer, 0.3-1.5 parts of coupling agent and 0.1-0.5 part of light conversion agent.

[0018] The application also provides an HJT vertical installation photovoltaic module, comprising the light conversion film as described above.

[0019] Compared with the prior art, the application has the following beneficial effects: The light conversion agent of the application is designed in the molecular structure, and benzothiophene is grafted at the 5-position of the benzene ring of the benzotriazole mother body, and chlorobenzene is grafted at the 6-position; wherein, the benzothiophene is a high electron density heteroaryl, and the chlorobenzene is a low electron density aromatic ring, which can form an electron cloud density gradient, and the excited state electron preferentially radiates to the 5-position side with high electron density, so that the emission direction angle is controlled at 20-25 DEG (pointing to the receiving surface of the cell sheet), when vertically installed, the effective light ratio pointing to the cell sheet is improved after the light conversion agent is excited by large-angle oblique light, the invalid light ratio pointing to the glass-air interface is reduced, and the total reflection loss rate is reduced; at the same time, the steric hindrance effect of the asymmetric structure can inhibit the aggregation of the light conversion agent molecules, and the uniformity of the emission is improved. Therefore, by the synergistic effect of directional emission to reduce total reflection loss and uniform emission to reduce gap loss, the light conversion agent is used in the HJT vertical installation photovoltaic module, which can improve the power generation capacity of the HJT vertical installation photovoltaic module. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be described clearly and completely below in conjunction with specific embodiments, but those skilled in the art will understand that the following described embodiments are part of the embodiments of the present application, not all the embodiments, and are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be purchased on the market.

[0021] In some embodiments of the present application, a light conversion agent is provided, comprising at least one of the compounds having a structure as shown in formula (I); (I); wherein R1, R2 and R3 are each independently any one of hydrogen, substituted or unsubstituted anilino.

[0022] The 5th and 6th positions on the benzene ring of the benzotriazole parent are high activity sites without substitution, a benzothiophene (high electron density heteroaryl) is grafted at the 5th position and a chlorobenzene (low electron density aromatic ring) is grafted at the 6th position, to obtain a light conversion agent with asymmetric aromatic ring substitution.

[0023] For HJT (heterojunction) photovoltaic modules, the core difference between vertical installation and horizontal installation is that the proportion of large-angle oblique light is high; the light conversion agent of the present application forms an electron cloud density gradient through asymmetric aromatic ring substitution on the benzene ring of the benzotriazole parent, 5th position benzothiophene substitution and 6th position chlorobenzene substitution, and excitation state electrons preferentially radiate to the 5th position side with high electron density, so that the emission direction is controlled at 20°~25° (pointing to the receiving surface of the cell sheet). When installed vertically, the proportion of effective light pointing to the cell sheet increases after the light conversion agent is excited by large-angle oblique light, the proportion of ineffective light pointing to the glass-air interface decreases, and the total reflection loss rate decreases. At the same time, the steric hindrance effect of the asymmetric structure can inhibit the aggregation of the light conversion agent molecules, improve the uniformity of the emission, and reduce the loss of ineffective light pointing to the gap between the cells. Therefore, by the synergistic effect of directional emission to reduce total reflection loss and uniform emission to reduce gap loss, the light conversion agent is used in HJT vertically installed photovoltaic modules, which can improve the power generation of the HJT vertically installed photovoltaic modules.

[0024] In some embodiments of the present application, the light conversion agent comprises one or both of the compounds having structures as shown in formula (II) and formula (III); (II); (III).

[0025] The present application is directed to the improvement of the benzotriazole parent structure in the above-mentioned formula (II) and formula (III), grafting benzothiophene and chlorobenzene at the 5th and 6th positions of the benzene ring, respectively, by designing the molecular structure, and giving the light conversion agent the ability of directional and uniform light emission.

[0026] The preparation method of the above-mentioned light conversion agent is also provided in some embodiments of the present application, comprising the following steps: S1, reacting compound A and N-iodosuccinimide (NIS) to obtain intermediate 1; reacting intermediate 1 and N-bromosuccinimide (NBS) to obtain intermediate 2; The structural general formula of compound A is ; wherein R1, R2 and R3 are each independently any one of hydrogen, substituted or unsubstituted anilino; S2, carrying out a third reaction of intermediate 2 and benzothiophene borate to obtain intermediate 3; S3, carrying out a fourth reaction of intermediate 3 and chlorobenzene borate to obtain the light conversion agent.

[0027] The present application takes benzotriazole light conversion material (compound A) as the base, preferentially introduces iodine at the 5th position of the benzene ring and bromine at the 6th position, prepares a dihalogenated intermediate; the dihalogenated intermediate is further grafted with benzothiophene (high electron density heteroaryl) at the 5th position and chlorobenzene (low electron density aromatic ring) at the 6th position to obtain the light conversion agent.

[0028] In some embodiments of the present application, in step S1, compound A includes one or both of the compounds having the structures as shown in formula (IV) and formula (V); (IV); (V).

[0029] In some embodiments of the present application, in step S1, the mass ratio of compound A and N-iodosuccinimide (NIS) is 100:20-50; typically but not limitedly, for example, the mass ratio of compound A and N-iodosuccinimide (NIS) can be 100:20, 100:30, 100:40, 100:50, and any value between any two of them.

[0030] In some embodiments of the present application, in step S1, the first reaction includes: reacting at -5-10℃ for 0.5-2h; preferably, the first reaction includes: reacting at 0℃ for 1h.

[0031] In some embodiments of the present application, in step S1, the mass ratio of the intermediate 1 and N-bromosuccinimide (NBS) is 100:20-50; typically but not exclusively, for example, the mass ratio of the intermediate 1 and N-bromosuccinimide (NBS) can be 100:20, 100:30, 100:40, 100:50, and any value between any two of them.

[0032] In some embodiments of the present application, in step S1, the second reaction includes: reacting at 20-30°C for 2-4h; preferably, the second reaction includes: reacting at 25°C for 3h.

[0033] In some embodiments of the present application, in step S1, the first reaction is carried out in a solvent by using compound A and N-iodosuccinimide (NIS), to obtain a reaction solution containing the intermediate 1; the second reaction is carried out by using the reaction solution containing the intermediate 1 and N-bromosuccinimide (NBS), to obtain a reaction solution containing the intermediate 2; Preferably, the solvent includes but is not limited to trifluoroacetic acid (TFA); Preferably, the mass ratio of compound A and the solvent is 100:30-60; Preferably, the reaction solution containing the intermediate 2 is poured into ice water, and a brown-yellow solid is obtained by filtration, which is recrystallized by using ethanol to obtain the intermediate 2; Preferably, the mass ratio of compound A and ethanol is 100:50-200.

[0034] In some embodiments of the present application, in step S2, the benzothiophene borate includes but is not limited to benzothiophene-2-boronic acid pinacol ester.

[0035] In some embodiments of the present application, in step S2, the mass ratio of the intermediate 2 and the benzothiophene borate is 100:40-70; typically but not exclusively, for example, the mass ratio of the intermediate 2 and the benzothiophene borate can be 100:40, 100:50, 100:60, 100:70, and any value between any two of them.

[0036] In some embodiments of the present application, in step S2, the third reaction includes: reacting at 80-100°C for 4-6h; preferably, the third reaction includes: reacting at 90°C for 5h.

[0037] In some embodiments of the present invention, in step S2, under a protective atmosphere, 100 parts of intermediate 2 and 20-50 parts of potassium carbonate are dissolved in 50-200 parts of ethanol, the temperature is raised to 80-100°C, and 40-70 parts of a toluene solution of benzothiophene borate ester and Pd(dppf)Cl2 (2-6 parts of Pd(dppf)Cl2 and 100-200 parts of toluene) are added dropwise. After the addition is completed, the reaction is carried out for 4-6 hours to obtain a reaction solution containing intermediate 3. The reaction solution containing intermediate 3 was sequentially separated, washed and dried with organic phase, and concentrated by rotary evaporation to obtain intermediate 3.

[0038] In some embodiments of the present invention, in step S3, the chlorophenylboronic acid ester includes, but is not limited to, 3-chlorophenylboronic acid pinacol ester.

[0039] In some embodiments of the present invention, in step S3, the mass ratio of intermediate 3 to chlorophenylboronic acid ester is 100:40 to 70; typically, but not limitingly, for example, the mass ratio of intermediate 3 to chlorophenylboronic acid ester can be 100:40, 100:50, 100:60, 100:70, and any value between any two of them.

[0040] In some embodiments of the present invention, in step S3, the fourth reaction includes reacting at 90~110°C for 5~7 hours; preferably, the fourth reaction includes reacting at 100°C for 6 hours.

[0041] In some embodiments of the present invention, in step S2, under a protective atmosphere, 100 parts of intermediate 3 and 20-50 parts of cesium carbonate are dissolved in 50-200 parts of ethanol, the temperature is raised to 90-110°C, and 40-70 parts of chlorophenylboronic acid ester and DMF solution of Pd(PPh3)4 (2-6 parts of Pd(PPh3)4 and 100-200 parts of DMF) are added dropwise. After the addition is completed, the reaction is carried out for 5-7 hours to obtain a reaction solution containing a phototransfer agent. The reaction solution containing the light transfer agent was sequentially separated, washed and dried with the organic phase, and recrystallized to obtain the light transfer agent.

[0042] In some embodiments of the present invention, a light transfer film is also provided, comprising the above-mentioned light transfer agent.

[0043] In some embodiments of the present invention, the phototransfer film comprises, by weight parts, the following components: The matrix resin contains 100 parts, crosslinking agent 0.5-1.5 parts, co-crosslinking agent 0.1-1 parts, antioxidant 0.1-0.5 parts, light stabilizer 0.1-1 parts, coupling agent 0.3-1.5 parts, and light conversion agent 0.1-0.5 parts.

[0044] In some embodiments of the present invention, the matrix resin includes, but is not limited to, ethylene vinyl acetate copolymer (EVA). Crosslinking agents include, but are not limited to, at least one of peroxide-based crosslinking agents; preferably tert-butyl percarbonate-2-ethylhexyl ester; Crosslinking agents include, but are not limited to, ethylene glycol dimethacrylate; Antioxidants include, but are not limited to, any one or more of hindered phenolic antioxidants and phosphite antioxidants; preferably, tri(nonylphenyl) phosphite; Light stabilizers include, but are not limited to, 4 Benzoyloxy 2,2,6,6 Tetramethylpiperidine; The coupling agent includes, but is not limited to, at least one of silane coupling agents; preferably γ-glycidoxypropyltrimethoxysilane.

[0045] In some embodiments of the present invention, a method for preparing the above-mentioned phototransfer film is also provided, comprising the following steps: The components are mixed evenly in proportion and then extruded and cast into a film.

[0046] In some embodiments of the present invention, the extrusion casting temperature is 80~90°C.

[0047] In practice, the mixing process can be carried out in a mixer; the extrusion casting process can be carried out in a casting machine.

[0048] The thickness of the phototransfer film can be adjusted according to actual needs, such as 0.5mm, but is not limited to this.

[0049] In some embodiments of the present invention, an HJT vertically mounted photovoltaic module is also provided, including the above-mentioned light transfer film.

[0050] In some embodiments of the present invention, the HJT vertically mounted photovoltaic module includes an HJT cell and glass, with a light transfer film bonded between the HJT cell and the glass.

[0051] Example 1 The structural formula of the light transfer agent provided in this embodiment is: .

[0052] The method for preparing the light transfer agent provided in this embodiment includes the following steps: S1. Dissolve 100 parts of compound A in 50 parts of trifluoroacetic acid (TFA), add 30 parts of N-iodosuccinimide (NIS) at 0°C, stir for 1 h to obtain a reaction solution containing intermediate 1. The structural formula of compound A is: ; The structural formula of intermediate 1 is: ; The reaction solution containing intermediate 1 was heated to 25°C, 30 parts of N-bromosuccinimide (NBS) were added, and the reaction was continued for 3 hours. The mixture was poured into ice water and filtered to obtain a brownish-yellow solid. It was recrystallized from 100 parts of ethanol to obtain intermediate 2. The structural formula of intermediate 2 is: .

[0053] S2. Under nitrogen protection, 100 parts of intermediate 2 and 35 parts of potassium carbonate were dissolved in 100 parts of ethanol. The mixture was heated to 90°C, and 50 parts of a toluene solution of benzothiophene-2-boronic acid pinene ester and Pd(dppf)Cl2 (3 parts Pd(dppf)Cl2 and 150 parts toluene) were added dropwise over 40 min. After the addition was completed, the reaction was carried out for 5 h to obtain a reaction solution containing intermediate 3. The reaction solution containing intermediate 3 was then subjected to separation, washing and drying of the organic phase, and rotary evaporation to concentrate intermediate 3. The structural formula of intermediate 3 is: .

[0054] S3. Under nitrogen protection, 100 parts of intermediate 3 and 35 parts of cesium carbonate were dissolved in 100 parts of ethanol, heated to 100°C, and 50 parts of 3-chlorophenylboronic acid pinacol ester and DMF solution of Pd(PPh3)4 (3 parts of Pd(PPh3)4 and 150 parts of DMF) were added. The reaction was carried out for 6 hours to obtain a reaction solution containing the light transfer agent. The reaction solution containing the light transfer agent was subjected to separation, washing and drying of the organic phase, and recrystallization to obtain the light transfer agent.

[0055] Example 2 The structural formula of the light transfer agent provided in this embodiment is: .

[0056] The method for preparing the light transfer agent provided in this embodiment includes the following steps: S1. Dissolve 100 parts of compound A in 50 parts of trifluoroacetic acid (TFA), add 30 parts of N-iodosuccinimide (NIS) at 0°C, stir for 1 h to obtain a reaction solution containing intermediate 1. The structural formula of compound A is: ; The reaction solution containing intermediate 1 was heated to 25°C, 30 parts of N-bromosuccinimide (NBS) were added, and the reaction was continued for 3 hours. The mixture was then poured into ice water and filtered to obtain a brownish-yellow solid. The solid was recrystallized from 100 parts of ethanol to obtain intermediate 2.

[0057] S2. Under nitrogen protection, 100 parts of intermediate 2 and 35 parts of potassium carbonate were dissolved in 100 parts of ethanol, and the mixture was heated to 90°C. 50 parts of a toluene solution of benzothiophene-2-boronic acid pinene ester and Pd(dppf)Cl2 (3 parts Pd(dppf)Cl2 and 150 parts toluene) were added dropwise over 40 min. After the addition was completed, the reaction was carried out for 5 h to obtain a reaction solution containing intermediate 3. The reaction solution containing intermediate 3 was then subjected to separation, washing and drying of the organic phase, and rotary evaporation concentration to obtain intermediate 3.

[0058] S3. Under nitrogen protection, 100 parts of intermediate 3 and 35 parts of cesium carbonate were dissolved in 100 parts of ethanol, heated to 100°C, and 50 parts of 3-chlorophenylboronic acid pinacol ester and DMF solution of Pd(PPh3)4 (3 parts of Pd(PPh3)4 and 150 parts of DMF) were added. The reaction was carried out for 6 hours to obtain a reaction solution containing the light transfer agent. The reaction solution containing the light transfer agent was subjected to separation, washing and drying of the organic phase, and recrystallization to obtain the light transfer agent.

[0059] Example 3 The method for preparing the phototransfer film provided in this embodiment includes the following steps: 100 parts of EVA, 1 part of crosslinking agent (tert-butyl peroxycarbonate-2-ethylhexyl ester), 0.5 parts of co-crosslinking agent (ethylene glycol dimethacrylate), 0.5 parts of antioxidant (tris(nonylphenyl) phosphite), 1 part of light stabilizer (4-benzoyloxy-2,2,6,6-tetramethylpiperidine), 0.8 parts of coupling agent (γ-glycidyl etheroxypropyltrimethoxysilane), and 0.2 parts of the light transfer agent from Example 1 were mixed evenly in a mixer and fed into a casting machine at 80°C. The mixture was then subjected to plasticizing extrusion, stretching, traction, and winding to form a light transfer film with a thickness of 0.5 mm.

[0060] Example 4 The method for preparing the phototransfer film provided in this embodiment is the same as in Example 3, except that the phototransfer agent in Example 1 is replaced with the phototransfer agent in Example 2.

[0061] Comparative Example 1 The preparation method of the phototransfer film provided in this comparative example is the same as that in Example 3, except that the phototransfer agent in Example 1 is replaced with benzotriazole.

[0062] Comparative Example 2 The preparation method of the phototransfer film provided in this comparative example is the same as that in Example 3, except that the phototransfer agent in Example 1 is replaced with compound A in Example 1.

[0063] Comparative Example 3 The method for preparing the light transfer film provided in this comparative example is the same as in Example 3, except that the light transfer agent in Example 1 is replaced with a light transfer agent having the structure shown below; ; The preparation method is the same as that of the light transfer agent in Example 1, except that benzothiophene-2-borate pinacol ester is replaced with dibenzothiophene-2-borate pinacol ester (CAS No.: 890042-21-4).

[0064] Comparative Example 4 The method for preparing the light transfer film provided in this comparative example is the same as in Example 3, except that the light transfer agent in Example 1 is replaced with a light transfer agent having the structure shown below; ; The preparation method is the same as that of the light transfer agent in Example 1, except that 3-chlorophenylboronic acid pinacol ester is replaced with phenylboronic acid pinacol ester.

[0065] Comparative Example 5 The preparation method of the light transfer film provided in this comparative example is the same as that in Example 3, except that the light transfer agent in Example 1 is replaced with a light transfer agent having the structure shown below, which is intermediate 3 in Example 1; .

[0066] Comparative Example 6 The method for preparing the light transfer film provided in this comparative example is the same as in Example 3, except that the light transfer agent in Example 1 is replaced with a light transfer agent having the structure shown below; ; Its preparation method includes the following steps: Under nitrogen protection, 100 parts of intermediate 1 from Example 1 and 35 parts of potassium carbonate were dissolved in 100 parts of ethanol, heated to 90°C, and 50 parts of a toluene solution of 3-chlorophenylboronic acid pinacol ester and Pd(dppf)Cl2 (3 parts Pd(dppf)Cl2 and 150 parts toluene) were added dropwise over a period of 40 min. After the addition was completed, the reaction was carried out for 5 h to obtain a reaction solution. The reaction solution was then subjected to separation, organic phase washing and drying, and rotary evaporation concentration to obtain the phototransfer agent.

[0067] Test case Light transfer films and 210-size HJT solar cells were prepared using Examples 3-4 and Comparative Examples 1-6, respectively, and 110-size HJT vertical mounting modules were fabricated. The annual power generation of the HJT vertical mounting modules was tested, and the results are shown in Table 1.

[0068] Table 1

[0069] As can be seen from Table 1, the light conversion agent of the present invention grafts specific substituent groups at the 5 and 6 positions of the benzene ring of the benzotriazole parent compound, with benzothiophene grafted at the 5 position and chlorobenzene grafted at the 6 position; through the synergistic effect of reducing total internal reflection loss by directional luminescence and reducing gap loss by uniform luminescence, the power generation of HJT vertically mounted photovoltaic modules is significantly improved.

[0070] Although the present invention has been illustrated and described with specific embodiments, it should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, without departing from the spirit and scope of the present invention; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such substitutions and modifications that fall within the scope of the present invention are included in the appended claims.

Claims

1. A light transfer agent, characterized in that, Including at least one of compounds having the structure shown in formula (I); （I）； R1, R2, and R3 are each independently hydrogen, substituted or unsubstituted aniline groups.

2. The light transfer agent according to claim 1, characterized in that, Including one or both of the compounds having the structures shown in Formula (II) and Formula (III); (II); (III)。 3. The method for preparing the light transfer agent as described in claim 1 or 2, characterized in that, Includes the following steps: S1. Compound A and N-iodosuccinimide are subjected to a first reaction to obtain intermediate 1; intermediate 1 and N-bromosuccinimide are subjected to a second reaction to obtain intermediate 2; The general structural formula of compound A is: R1, R2, and R3 are each independently hydrogen, substituted or unsubstituted aniline groups; S2. The intermediate 2 and benzothiophene borate ester are subjected to a third reaction to obtain intermediate 3; S3. The intermediate 3 and chlorophenylboronic acid ester are subjected to a fourth reaction to obtain the light transfer agent.

4. The method for preparing the light transfer agent according to claim 3, characterized in that, In step S1, compound A includes one or two compounds having structures as shown in formula (IV) and formula (V); (IV); （V）。 5. The method for preparing the light transfer agent according to claim 3, characterized in that, Step S1 includes at least one of the following features (1) to (4); (1) The mass ratio of compound A to N-iodosuccinimide is 100:20~50; (2) The first reaction includes: reacting at -5~10℃ for 0.5~2h; (3) The mass ratio of intermediate 1 to N-bromosuccinimide is 100:20~50; (4) The second reaction includes reacting at 20~30℃ for 2~4h.

6. The method for preparing the light transfer agent according to claim 3, characterized in that, In step S2, the mass ratio of intermediate 2 to benzothiophene borate ester is 100:40~70; And / or, the third reaction includes reacting at 80~100°C for 4~6 hours.

7. The method for preparing the light transfer agent according to claim 3, characterized in that, In step S3, the mass ratio of intermediate 3 to chlorophenylboronic acid ester is 100:40~70; And / or, the fourth reaction includes reacting at 90~110°C for 5~7 hours.

8. A light transfer film, characterized in that, Includes the light transfer agent as described in claim 1 or 2.

9. The phototransfer film according to claim 8, characterized in that, Based on parts by mass, it includes the following components: The matrix resin contains 100 parts, crosslinking agent 0.5-1.5 parts, co-crosslinking agent 0.1-1 parts, antioxidant 0.1-0.5 parts, light stabilizer 0.1-1 parts, coupling agent 0.3-1.5 parts, and light conversion agent 0.1-0.5 parts.

10. An HJT vertically mounted photovoltaic module, characterized in that, Including the phototransfer film as described in claim 8 or 9.

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