A kind of anti-reflection type light-converting glass film layer and preparation method thereof

Abstract

The present invention discloses an anti-reflection type light-converting glass film layer and a preparation method thereof. Specifically, a solution containing a photovoltaic glass coating liquid and a down-conversion material precursor is coated on the surface of the photovoltaic glass, and then calcined to obtain the anti-reflection type light-converting glass film layer. The present invention uses the coating liquid as a carrier, combines it with the precursor of the down-conversion material, uniformly coats it on the glass surface, and then prepares an anti-reflection type light-converting glass film layer in situ by co-firing. Compared with traditional coated glass, the light transmittance is greatly improved; at the same time, ultraviolet light can be converted into red light of about 619 nm with the highest battery utilization efficiency. The present invention solves the shading problem of photovoltaic cells in which down-conversion materials are usually applied, thereby improving the photoelectric conversion efficiency of the battery; at the same time, when applied to photovoltaic modules, it can also have an anti-ultraviolet effect. The preparation process of this method is relatively simple and low-cost, and it is expected to be widely used in the photovoltaic industry.

Description

Technical Field

[0001] The invention belongs to solar cell technology, and in particular relates to an anti-reflection type light-converting glass film layer and a preparation method thereof. Background Art

[0002] As global environmental energy issues become increasingly prominent, crystalline silicon solar cells have become the mainstream product in the current photovoltaic market due to their low cost, high photoelectric conversion efficiency, high stability and pollution-free characteristics. Although crystalline silicon solar cells have many advantages, due to the limitation of silicon's energy band gap (Eg = 1.12 eV), low-energy photons in sunlight cannot cross the band gap and be absorbed by silicon. Only part of the energy in high-energy photons is absorbed by silicon, and most of the energy is dissipated in the form of heat energy, resulting in the theoretical efficiency limit of crystalline silicon solar cells being only about 29%. How to continue to improve its photoelectric efficiency is still the most concerned issue in academia and industry.

[0003] As mentioned above, spectral mismatch greatly restricts the effective utilization rate of light by crystalline silicon solar cells. In addition, high-energy ultraviolet light in sunlight can also lead to the attenuation of cell performance and the aging of polymer packaging materials (such as backplanes). Using down-conversion materials to convert high-energy ultraviolet light into medium- and long-wavelength light with higher utilization rates for crystalline silicon solar cells can not only greatly improve the photoelectric conversion efficiency of the cell, but also minimize the impact of ultraviolet light on component performance and packaging material reliability.

[0004] At present, there are two main ways to apply down-conversion materials to solar cells: (i) directly coating the down-conversion materials on the surface of the cell; (ii) combining the down-conversion materials with component polymer packaging materials such as EVA to form a light-conversion layer. However, these methods have not made any substantial progress in the actual application of photovoltaic cells and components. The main reasons are that most down-conversion materials are mainly particles, which are directly placed on the surface of the cell, which will inevitably cause negative effects of shading; at the same time, the outermost glass after the cell is encapsulated has a certain absorption of ultraviolet light, which restricts the light-conversion efficiency of the down-conversion material. Summary of the invention

[0005] The prior art uses down-conversion materials to prepare the light-converting glass, which has the defects of shading and weak efficiency improvement. The present invention discloses an anti-reflection type light-converting glass film layer and a preparation method thereof, which is mainly applied to the front surface of the glass in the form of a photovoltaic glass coating liquid combined with a down-conversion material precursor. The obtained film layer has a relatively good refractive index and anti-reflection and anti-reflection effects, and also has a certain hydrophilic self-cleaning function. The present invention greatly improves the transmittance of the photovoltaic glass, thereby increasing the power of the photovoltaic module, and can be widely used on the surface of the photovoltaic glass.

[0006] The present invention adopts the following technical solution:

[0007] An anti-reflection type light-converting glass film layer and a preparation method thereof, wherein a solution containing a photovoltaic glass coating liquid and a down-conversion material precursor is coated on the surface of the photovoltaic glass, and then calcined to obtain the anti-reflection type light-converting glass film layer.

[0008] The invention discloses an anti-reflection type light-converting glass, comprising photovoltaic glass and an anti-reflection type light-converting film on the surface thereof, which is prepared by the preparation method of the anti-reflection type light-converting glass film layer.

[0009] Preferably, the thickness of the anti-reflection type light-converting glass film layer is 100-150 nm, such as 120 nm.

[0010] The invention discloses a solar cell, which takes the above-mentioned anti-reflection type light-converting glass as a substrate.

[0011] In the present invention, a down-conversion material precursor solution is prepared with metal oxide and strong acid as raw materials in the presence of additives; then the down-conversion material precursor solution, photovoltaic glass coating solution and organic solvent are mixed to obtain a solution containing photovoltaic glass coating solution and down-conversion material precursor.

[0012] In the present invention, when preparing the down-conversion material precursor solution, the strong acid is nitric acid, the additive is an organic weak acid and an ammonium salt; the organic weak acid is acetic acid, citric acid, etc.; the organic solvent is alcohol. Preferably, the pH of the down-conversion material precursor solution is 1-3.

[0013] In the present invention, the metal oxide is a rare earth oxide, or the metal oxide is a rare earth oxide and other metal oxides; the rare earth oxide includes yttrium oxide and europium oxide, and the other metal oxide includes bismuth oxide.

[0014] Preferably, in the down-conversion material precursor solution, the molar ratio of yttrium oxide, europium oxide, bismuth oxide, citric acid, and ammonium metavanadate is (25-30): (1.5-1.6): (1.5-1.6): (60-65): (60-65), preferably (28-29): (1.5-1.6): (1.5-1.6): (62-63): (62-65). More preferably, the concentration of ammonium metavanadate is 6.0×10 -2 mol / L~6.5×10 -2 mol / L.

[0015] In the present invention, the volume ratio of down-conversion precursor solution: coating solution: alcohol is 1: (1-1.5): (35-40), preferably 1: 1.2: (38-40).

[0016] In the present invention, the calcination temperature is 700-1100° C., and the time is 80-150 seconds. Preferably, the calcination temperature is 850-950° C., and the time is 100-120 seconds.

[0017] The present invention uses the coating liquid as a carrier, combines it with the precursor of the down-conversion material, uniformly coats it on the glass surface, and then prepares a light-converting glass film layer with anti-reflection in situ by co-firing. The experimental results show that the glass film layer prepared by the present invention has a greatly improved transmittance compared to traditional coated glass; at the same time, it can convert ultraviolet light into red light of about 619 nm with the highest battery utilization efficiency. It not only solves the shading problem of photovoltaic cells in the application of down-conversion materials, thereby improving the photoelectric conversion efficiency of the battery; at the same time, it can also play an anti-ultraviolet effect when applied to photovoltaic modules. The preparation process of this method is relatively simple and low-cost, and it is expected to be widely used in the photovoltaic industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the SEM image of the surface of the quartz glass original piece.

[0019] Figure 2 This is a SEM image of the surface of the anti-reflection light-converting film layer of Example 1.

[0020] Figure 3 This is a SEM image of the surface of the antireflection film layer of comparative example 1.

[0021] Figure 4 This is the SEM image of the surface of the second light-conversion layer in the comparative example.

[0022] Figure 5 These are the transmission curves of quartz glass, the comparative anti-reflection film layer, and the anti-reflection light-converting film layer of Example 1.

[0023] Figure 6 The excitation spectra of quartz glass, the comparative anti-reflection film layer, and the anti-reflection light-converting film layer of Example 1 monitored at 618 nm.

[0024] Figure 7 The emission spectra of quartz glass, the comparative anti-reflection film layer, and the anti-reflection type light-converting film layer of Example 1 are excited by 300 nm light.

[0025] Figure 8 The efficiency test of the quartz glass, the comparative anti-reflection film layer, and the anti-reflection light-converting film layer of Example 1 was performed on a standard cell.

[0026] Fig. 9 The excitation spectra of the anti-reflection type light conversion film layer monitored at 618 nm under different calcination temperatures.

[0027] Fig.10 These are the emission spectra of the anti-reflection type light conversion film layer calcined at different temperatures when excited by 300 nm light.

[0028] Fig.11The excitation spectra of the anti-reflection light conversion film formed by different Bi concentrations monitored at 618 nm.

[0029] Fig.12 The emission spectra of the anti-reflection light-conversion film formed with different Bi concentrations when excited by 300 nm light.

[0030] Fig.13 The contact angle change of the anti-reflection type light conversion film layer formed by different proportions of down-conversion precursor, coating solution and alcohol.

[0031] Fig.14 The transmittance change of the anti-reflection type light conversion film layer formed by different proportions of down-conversion precursor, coating solution and alcohol. DETAILED DESCRIPTION

[0032] The present invention proposes a method for preparing an anti-reflection type light-converting glass film layer, which is specifically as follows:

[0033] 1. Prepare a solution A from the precursor material for preparing the down-conversion material;

[0034] 2. Mix the photovoltaic glass coating liquid and the organic solvent to prepare solution B;

[0035] 3. Mix solution A and solution B to prepare solution C;

[0036] 4. Take solution C and apply it on the surface of a clean photovoltaic glass sheet, and place it in a high-temperature furnace for calcination to obtain an anti-reflection light-converting film layer on the surface of the photovoltaic glass.

[0037] Preferably, the organic solvent is alcohol.

[0038] Advantages of the present invention. On the one hand, compared with traditional coated glass, the light transmittance is greatly improved; on the other hand, ultraviolet light can be converted into red light of about 619 nm, which has the highest battery utilization efficiency. It not only solves the shading problem of photovoltaic cells in which down-conversion materials are usually applied, thereby improving the photoelectric conversion efficiency of the battery; at the same time, it is applied to photovoltaic modules to achieve an anti-ultraviolet effect. The preparation process of this method is relatively simple and low-cost, and it is expected to be widely used in the photovoltaic industry.

[0039] The raw materials used in the present invention are all existing substances, and the specific preparation operations and testing methods are all conventional technologies; the coating liquid is the standard coating liquid CG103 of Chenguang (Changzhou) New Material Technology Co., Ltd.

[0040] Test instruments and parameters: Scanning Electron Microscope (SEM, S-4700, Hitachi, Japan); ultraviolet-visible spectrophotometer (ultraviolet-visible, UV, UV 3600, Shimadzu, Japan); steady-state / transient fluorescence spectrometer (PL, FLS 1000, Edinburgh, UK); IV tester (FCT-450, America). The IV test conditions are conventional technology, 25 ℃, AM1.5, light intensity 1000 W / m 2 Before the test, the instrument needs to be calibrated with a standard battery cell to reduce the test error.

[0041] A quartz glass original sheet of 3 cm×3 cm and 1 mm thick was used for photovoltaic glass substrate after ultrasonic cleaning. The solution was spun on the quartz glass at 3000 r / min for 60 seconds using spin coating to form a film layer. During calcination, the high-temperature furnace was first heated from room temperature to the calcination temperature, and then the coated glass was placed in the furnace to start calcination.

[0042] Embodiment 1

[0043] Solution A preparation: Take yttrium oxide (2.81×10 -2 mol / L), europium oxide (1.56×10 -3 mol / L) and bismuth oxide (1.56×10 -3 mol / L) was placed in 40 ml of deionized water, and 5 ml of 68% nitric acid was added to dissolve it in a 60°C water bath under stirring. After it became clear, citric acid (6.29×10 -2 mol / L) and ammonium metavanadate (6.30×10 -2 mol / L), and after the solution turns blue, ammonia water is added to adjust the pH to 2, and then stirred in a 60 °C water bath for 3 h to form the final solution A; the concentration of the metal oxide is the concentration in the system after the nitric acid is dissolved;

[0044] Solution B preparation: Take 97 ml of anhydrous alcohol and put it into a 100 ml beaker, take 3 ml of photovoltaic glass coating liquid and add it to the alcohol, stir thoroughly to form a mixed solution B;

[0045] Solution C preparation: Take 0.1 ml of solution A and 4 ml of solution B, mix to make solution C;

[0046] 0.1 ml of solution C was taken with a pipette and coated on a photovoltaic glass substrate, which was then placed in a high-temperature furnace and calcined at 900°C in air for 110 s to obtain an anti-reflection light-converting film layer located on the glass surface with a film thickness of 120 nm.

[0047] Comparative Example 1

[0048] Take 97 ml of anhydrous ethanol and put it into a 100 ml beaker, take 3 ml of photovoltaic glass coating liquid and add it to the alcohol, stir it thoroughly to form a mixed solution, take 0.1 ml of the mixed solution and coat it on the photovoltaic glass substrate, then place it in a high-temperature furnace in air and calcine at 900°C for 110 s to obtain a film layer on the glass surface.

[0049] Comparative Example 2

[0050] Take yttrium oxide (2.81×10 -2 mol / L), europium oxide (1.56×10 -3 mol / L) and bismuth oxide (1.56×10 -3 mol / L) was put into 40 ml deionized water, and 5 ml of 68% nitric acid was added to dissolve it in a 60°C water bath with stirring. After it became clear, 0.2 g of sodium dodecyl sulfate and 1 g of polyethylene glycol were added in sequence, and then stirred in a 60°C water bath for 3 h to form the final solution A; the concentration of the metal oxide was the concentration in the system after the nitric acid dissolved it;

[0051] Solution C preparation: Take 0.1 ml of solution A and 4 ml of anhydrous alcohol, mix to prepare solution C;

[0052] 0.1 ml of solution C was coated on the photovoltaic glass substrate using a pipette, spin-coated at 3000 r / min for 60 s, and then placed in a high-temperature furnace for calcination at 900°C in air for 110 s to obtain a film layer located on the glass surface.

[0053] Figure 1 This is the SEM image of the surface of the original quartz glass sheet. Figure 2 This is a SEM image of the surface of the anti-reflection type light-converting film layer of Example 1. Figure 3 This is the SEM image of the membrane surface of Comparative Example 1. Figure 4This is the SEM image of the film surface of Comparative Example 2. The surface of the quartz glass original sheet finally formed by the cleaning process is very flat overall; the surface of the quartz glass surface coated with photovoltaic coating liquid in Comparative Example 1 appears a layer of film after high-temperature calcination, and the surface is cleaner and flatter; in Comparative Example 2, directly growing the down-conversion precursor on the surface of the quartz glass will form a layer of down-conversion particles with a particle size of about 30nm evenly distributed on the surface of the quartz glass; in Example 1, the quartz glass coated with photovoltaic coating liquid and down-conversion material solution forms a hole structure with a diameter of 200 to 400 nm on the surface, destroying the flat structure.

[0054] Figure 5 The transmittance curves of quartz glass, comparative example 1 transparent film layer, comparative example 2 light conversion layer, and embodiment 1 anti-reflection type light conversion film layer are shown in FIG. 1 . The transmittance of quartz glass coated only with photovoltaic coating liquid increases by 0.4% in the range of 300 to 1200 nm compared with quartz glass, the transmittance of quartz glass coated with down-conversion particles decreases by 0.5% compared with quartz glass, and the transmittance of quartz glass coated with a mixed solution of photovoltaic coating liquid and down-conversion material increases by 1.2% relative to quartz glass.

[0055] Figure 6 Excitation spectra of quartz glass, comparative example 1 film layer, comparative example 2 light conversion layer, and embodiment 1 anti-reflection type light conversion film layer monitored at 618 nm; Figure 7 The emission spectra of quartz glass, comparative example 1 film layer, comparative example 2 light conversion layer, and embodiment 1 anti-reflection type light conversion film layer excited by 300 nm light. Figure 6 and Figure 7 As shown, from the excitation spectra of quartz glass, quartz glass coated coating solution, quartz glass coated coating solution and down-conversion mixed solution monitored at 618 nm and the emission spectra under 300 nm light excitation, it can be seen that the addition of coating solution has no obvious effect on luminescence. When the down-conversion material is added, obvious peaks appear near 618 nm and 700 nm, which can effectively explain that the material absorbs light from 200 to 350 nm and then emits 618 nm red light.

[0056] Figure 8 The conversion efficiency test of quartz glass, comparative example 1 film layer, and embodiment 1 anti-reflection type light conversion film layer was placed on the standard cell. Figure 8 As shown, from the efficiency test of quartz glass, quartz glass coated with coating solution, quartz glass plus coating solution and down-conversion placed on the front end of the standard cell, the efficiency improvement of only coating with coating solution is small, while the sample coated with a mixed solution of down-conversion and coating solution has the best efficiency improvement of 1.5%, which is the same as the trend of the previous transmission data.

[0057] The existing rare earth anti-reflection film has a short excitation band width, weak luminous intensity, poor film flatness, reduced transmission, and poor luminescence of the material due to temperature quenching. In addition, the combination with the silicon dioxide film is not good, and the wavelengths corresponding to its excitation spectrum and emission spectrum are not suitable for the performance of the battery. For example, the prior art uses Tb and Zn elements in combination, and its light conversion only uses the energy level transition and emission of the Tb element, and its excitation band will be very narrow. The present invention combines yttrium, europium, and bismuth with vanadium, and is well combined with the anti-reflection layer. The obtained film has a large excitation band width, high luminous intensity, and good transmission performance. The wavelengths corresponding to the excitation spectrum and emission spectrum are very suitable for the performance of the battery. The matrix that absorbs ultraviolet light can effectively transfer the absorbed ultraviolet light energy to the luminescent element to emit light, and also broadens the excitation peak and energy transfer efficiency.

[0058] Embodiment 2

[0059] Solution A preparation: Take yttrium oxide (2.81×10 -2 mol / L), europium oxide (1.56×10 -3 mol / L) and bismuth oxide (1.56×10 -3 mol / L) was placed in 40 ml of deionized water, and 5 ml of 68% nitric acid was added to dissolve it in a 60°C water bath under stirring. After it became clear, citric acid (6.29×10 -2 mol / L) and ammonium metavanadate (6.30×10 -2 mol / L), and after the solution turns blue, ammonia water is added to adjust the pH to 2, and then stirred in a 60 °C water bath for 3 h to form the final solution A; the concentration of the metal oxide is the concentration in the system after the nitric acid is dissolved;

[0060] Solution B preparation: Take 97 ml of anhydrous alcohol and put it into a 100 ml beaker, take 3 ml of photovoltaic glass coating liquid and add it to the alcohol, stir thoroughly to form a mixed solution B;

[0061] Solution C preparation: Take 0.1 ml of solution A and 4 ml of solution B, mix to make solution C;

[0062] 0.1 ml of solution C was taken with a pipette and coated on a cleaned glass substrate, which was then placed in a high-temperature furnace and calcined for 110 s in air at 500 °C to obtain an anti-reflection type light-converting film layer located on the glass surface.

[0063] Embodiment 3

[0064] Solution A preparation: Take yttrium oxide (2.81×10 -2 mol / L), europium oxide (1.56×10 -3 mol / L) and bismuth oxide (1.56×10-3 mol / L) was placed in 40 ml of deionized water, and 5 ml of 68% nitric acid was added to dissolve it in a 60°C water bath under stirring. After it became clear, citric acid (6.29×10 -2 mol / L) and ammonium metavanadate (6.30×10 -2 mol / L), and after the solution turns blue, ammonia water is added to adjust the pH to 2, and then stirred in a 60 °C water bath for 3 h to form the final solution A; the concentration of the metal oxide is the concentration in the system after the nitric acid is dissolved;

[0065] Solution B preparation: Take 97 ml of anhydrous alcohol and put it into a 100 ml beaker, take 3 ml of photovoltaic glass coating liquid and add it to the alcohol, stir thoroughly to form a mixed solution B;

[0066] Solution C preparation: Take 0.1 ml of solution A and 4 ml of solution B, mix to make solution C;

[0067] 0.1 ml of solution C was taken with a pipette and coated on a cleaned glass substrate, which was then placed in a high-temperature furnace and calcined for 110 s in air at 700 °C to obtain an anti-reflection type light-converting film layer located on the glass surface.

[0068] Embodiment 4

[0069] Solution A preparation: Take yttrium oxide (2.81×10 -2 mol / L), europium oxide (1.56×10 -3 mol / L) and bismuth oxide (1.56×10 -3 mol / L) was placed in 40 ml of deionized water, and 5 ml of 68% nitric acid was added to dissolve it in a 60°C water bath under stirring. After it became clear, citric acid (6.29×10 -2 mol / L) and ammonium metavanadate (6.30×10 -2 mol / L), and after the solution turns blue, ammonia water is added to adjust the pH to 2, and then stirred in a 60 °C water bath for 3 h to form the final solution A; the concentration of the metal oxide is the concentration in the system after the nitric acid is dissolved;

[0070] Solution B preparation: Take 97 ml of anhydrous alcohol and put it into a 100 ml beaker, take 3 ml of photovoltaic glass coating liquid and add it to the alcohol, stir thoroughly to form a mixed solution B;

[0071] Solution C preparation: Take 0.1 ml of solution A and 4 ml of solution B, mix to make solution C;

[0072] 0.1 ml of solution C was taken with a pipette and coated on a cleaned glass substrate, which was then placed in a high-temperature furnace and calcined for 110 s in air at 1100 °C to obtain an anti-reflection light-converting film layer located on the glass surface.

[0073] Fig. 9 The excitation spectra of the anti-reflection type light conversion film layer monitored at 618 nm at different calcination temperatures (110 s); Fig.10 The emission spectra of the anti-reflection type light conversion film layer excited by 300 nm light at different calcination temperatures (110 s) are shown in Figure 1. It can be found that calcination at 900℃ has achieved technological progress beyond imagination.

[0074] Embodiment 5

[0075] Solution A preparation: Take yttrium oxide (2.81×10 -2 mol / L), europium oxide (1.56×10 -3 mol / L) and bismuth oxide (1.56×10 -3 mol / L) was placed in 40 ml of deionized water, and 5 ml of 68% nitric acid was added to dissolve it in a 60°C water bath under stirring. After it became clear, citric acid (6.29×10 -2 mol / L) and ammonium metavanadate (6.30×10 -2 mol / L), and after the solution turns blue, ammonia water is added to adjust the pH to 2, and then stirred in a 60 °C water bath for 3 h to form the final solution A; the concentration of the metal oxide is the concentration in the system after the nitric acid is dissolved;

[0076] Solution B preparation: Take 97 ml of anhydrous alcohol and put it into a 100 ml beaker, take 3 ml of photovoltaic glass coating liquid and add it to the alcohol, stir thoroughly to form a mixed solution B;

[0077] Solution C preparation: Take 0.1 ml of solution A and 4 ml of solution B, mix to make solution C;

[0078] 0.1 ml of solution C was taken with a pipette and coated on a cleaned glass substrate, which was then placed in a high-temperature furnace and calcined for 120 s in air at 900°C to obtain an anti-reflection light-converting film layer located on the glass surface.

[0079] Comparative Example 3

[0080] Solution A preparation: Based on Example 1, the concentration of bismuth oxide was adjusted to 0 and 0.52×10 -3 mol / L or 2.60×10 -3 mol / L, and the rest remain unchanged, to obtain solution A with different bismuth contents;

[0081] Solution B preparation: Take 97 ml of anhydrous alcohol and put it into a 100 ml beaker, take 3 ml of photovoltaic glass coating liquid and add it to the alcohol, stir thoroughly to form a mixed solution B;

[0082] Solution C preparation: Take 0.1 ml of solution A and 4 ml of solution B, mix to make solution C;

[0083] 0.1 ml of solution C was taken with a pipette and coated on a photovoltaic glass substrate, which was then placed in a high-temperature furnace and calcined at 900°C in air for 110 s to obtain an anti-reflection type light-converting film layer located on the glass surface.

[0084] PL excitation spectra and emission spectra of different Bi contents are shown in Fig.11 and Fig.12 It can be seen that 3% Bi addition is the most appropriate, that is, the performance of Example 1 is the best.

[0085] Embodiment 6

[0086] On the basis of Example 1, the amount of down-conversion precursor solution was changed, and the rest remained unchanged to obtain different anti-reflection type light-converting glass film layers. The water contact angle was tested by conventional methods. The results are shown in FIG. Fig.13 , (a) quartz glass, (b) 1.25:3:97, (c) 2.5:3:97, (d) 4:3:97; Example 1 The anti-reflection type light-converting glass film layer (c) has very good hydrophilic properties, and has excellent transmittance and down-conversion performance.

[0087] The prior art directly coats the down-conversion material on the surface of the cell or combines the down-conversion material with a polymer encapsulation material of a photovoltaic module such as EVA to form a light-conversion layer. However, these methods have not made any substantial progress in the actual application of photovoltaic cells and modules. The main reasons are analyzed as follows: first, most down-conversion materials are mainly particles, and directly placed on the surface of the cell, which will inevitably cause a certain negative effect of shading; at the same time, the outermost glass has a certain absorption of ultraviolet light after the cell is encapsulated, and this factor restricts the light-conversion efficiency of the down-conversion material. The present invention uses a coating liquid as a carrier, combines it with a precursor solution for preparing the down-conversion material, and then realizes in-situ preparation of a light-conversion glass film layer with an anti-reflection type by co-firing. On the one hand, compared with traditional coated glass, the transmittance is greatly improved; on the other hand, ultraviolet light can be converted into red light of about 619 nm with the highest battery utilization efficiency. It not only solves the shading problem of photovoltaic cells in which down-conversion materials are usually applied, thereby improving the photoelectric conversion efficiency of the battery; at the same time, it can also play an anti-ultraviolet effect when applied to photovoltaic modules. The preparation process of this method is relatively simple and low-cost, and it is expected to be widely used in the photovoltaic industry.

Claims

1. A method for preparing an anti-reflection type light-converting glass film layer, characterized in that: Using metal oxide and strong acid as raw materials, a down-conversion material precursor solution is prepared in the presence of additives; Then, the down-conversion material precursor solution, the photovoltaic glass coating solution and the organic solvent are mixed to obtain a solution containing the photovoltaic glass coating solution and the down-conversion material precursor; the solution containing the photovoltaic glass coating solution and the down-conversion material precursor is coated on the surface of the photovoltaic glass, and then calcined to obtain an anti-reflection type light-converting glass film layer; When preparing the down-conversion material precursor solution, the strong acid is nitric acid, and the additives are organic weak acid and ammonium salt; the pH of the down-conversion material precursor solution is 1-3; the metal oxide is a rare earth oxide, or the metal oxide is a rare earth oxide and other metal oxides; the rare earth oxide includes yttrium oxide and europium oxide, and the other metal oxides include bismuth oxide.

2. The method for preparing the anti-reflection type light-converting glass film layer according to claim 1, characterized in that: The calcination temperature is 700-1100°C and the calcination time is 80-150s.

3. An anti-reflection type light-converting glass film layer prepared according to the method for preparing an anti-reflection type light-converting glass film layer according to claim 1.

4. Anti-reflection type light-converting glass prepared according to the method for preparing anti-reflection type light-converting glass film layer according to claim 1.

5. A solar cell, using the anti-reflection type light-converting glass according to claim 4 as a substrate.

6. Use of the anti-reflection type light-converting glass according to claim 4 in preparing solar cells or improving the efficiency of solar cells.

7. Use of the anti-reflection type light-converting glass film layer according to claim 3 in preparing solar cells or improving the efficiency of solar cells.

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