An efficient light-converting coated glass, its preparation method, and a solar photovoltaic encapsulation component

Abstract

The present invention relates to an efficient light-converting coated glass, a preparation method thereof, and a solar photovoltaic encapsulation component, which comprises a glass substrate, and a light-converting film layer and an antireflection film layer sequentially coated on the matte surface of the glass substrate; the light-converting film layer contains a luminescent material, the light absorption wavelength of the luminescent material is 300 nm to 500 nm, and the light emission wavelength is 550 nm to 700 nm; the luminescent material is a quantum dot and / or a phosphor, and the addition amount of the luminescent material in the light-converting film layer is 0.1 wt% to 20 wt%. The solar photovoltaic encapsulation component comprises the light-converting coated glass of the present invention. The coated glass of the present invention has higher light conversion efficiency and better weather resistance, and the encapsulation component prepared therefrom has better solar cell conversion efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, and particularly relates to an efficient light conversion coated glass, a preparation method thereof, and a solar photovoltaic encapsulation component. Background Art

[0002] In order to cope with the energy crisis and environmental pollution, new energy has become the focus of global attention. Solar energy has attracted particular attention due to its cleanliness and environmental friendliness. Therefore, the solar cell industry has developed rapidly. The issue facing people is how to further improve the conversion efficiency of solar energy and reduce the cost of solar energy equipment, so that the cost of solar cells can be reduced to a level comparable to that of conventional energy power generation.

[0003] Currently, the solar energy application market in China has also developed rapidly and has become the largest photovoltaic application market in the world. However, the popularization and application of solar cells are still limited, mainly because of their high cost. Therefore, further reducing the manufacturing cost is the key to the large-scale application of solar cells, and improving the conversion efficiency of solar cells is one of the effective ways to reduce costs. It is understood that for every 1% increase in conversion efficiency, the cost will be reduced by 7%.

[0004] To improve the conversion efficiency of solar cells, in addition to improving the conversion efficiency of the cell itself through various technical means, better solutions should also be proposed in terms of improving the light transmittance and weather resistance of its encapsulation material - photovoltaic glass. The current mainstream technical solution is to coat an antireflection film (abbreviated as AR coating) on the surface of photovoltaic glass, that is, using the sol-gel method to coat a layer of porous silica material on the surface of photovoltaic glass to reduce the reflection of light in a specific wavelength band, thereby improving the light transmittance of photovoltaic glass. The methods of coating on the glass surface include roll coating, spraying, surface etching, aerosol method, etc. Among them, roll coating is the most widely used due to its convenience in implementation. Currently, major photovoltaic glass manufacturers are working hard to improve the technical level of AR coating to strive for higher light transmittance and effectively improve the power generation efficiency of photovoltaic modules to meet the development needs of photovoltaic module manufacturers. For example, Chinese Patent (Patent No.: CN 110272214 A) discloses a high-light transmittance and high-weather resistance antireflection photovoltaic coated glass product prepared by a multi-layer coating process. The antireflection photovoltaic coated glass product has the characteristics of high light transmittance, can achieve antireflection in a wide wavelength range, especially has a significant improvement in light transmittance in the infrared and ultraviolet bands, and has high weather resistance that can pass more stringent weather resistance tests.

[0005] However, the existing AR coating technology has reached a peak in improving the conversion efficiency of solar cells, and other technologies are needed to improve the conversion efficiency of solar cells. Summary of the Invention

[0006] In order to solve the technical problem of poor conversion efficiency of solar cells, an efficient light-converting coated glass, a preparation method thereof, and a solar photovoltaic encapsulation component are provided. The coated glass of the present invention has higher light-converting efficiency and better weather resistance.

[0007] To achieve the above object, the present invention is realized by the following technical solutions:

[0008] An efficient light-converting coated glass includes a glass substrate, and a light-converting film layer and an antireflection film layer sequentially coated on the matte surface of the glass substrate; the light-converting film layer contains a luminescent material, and the light absorption wavelength of the luminescent material is 300 nm to 500 nm, and the light emission wavelength is 550 nm to 700 nm.

[0009] Further, the luminescent material is quantum dots and / or phosphor, and the addition amount of the luminescent material in the light-converting film layer is 0.1 wt% to 20 wt%. The addition amount of the luminescent material is appropriately adjusted according to the power effect of the finally produced solar photovoltaic encapsulation component. Excessive addition amount affects the light transmittance of the film layer, and those skilled in the art can obtain the optimal addition amount through optimization experiments.

[0010] Still further, the luminescent material is quantum dots.

[0011] Preferably, the luminescent material is CdTe quantum dots.

[0012] Still further, the refractive index of the light-converting film layer is 1.42 to 1.48, and the thickness of the light-converting film layer is 60 nm to 150 nm.

[0013] Further, the antireflection film layer is at least one layer, the refractive index of the antireflection film layer is 1.24 to 1.3, and the thickness of the antireflection film layer is 100 nm to 130 nm.

[0014] Further, the other surface of the glass substrate is an embossed surface.

[0015] On the other hand, the present invention provides a preparation method of the above-mentioned efficient light-converting coated glass, including the following steps: mixing the luminescent material with a coating solution and then roll-coating on the matte surface of the glass substrate, and obtaining a glass substrate with a light-converting film layer after curing; then roll-coating the coating solution on the surface of the light-converting film layer, and obtaining a glass substrate with an antireflection film layer after curing, thus obtaining the light-converting coated glass.

[0016] Finally, the present invention provides a solar photovoltaic encapsulation component, and the solar photovoltaic encapsulation component includes the above-mentioned light-converting coated glass. The light-converting coated glass, a front encapsulation material, a battery cell, a rear encapsulation material, and a backplane glass of the present invention can be laminated by a lamination method to obtain the solar photovoltaic encapsulation component.

[0017] Beneficial technical effects:

[0018] The high-efficiency light-converting coated glass of the present invention is successively coated with a light-converting film layer and at least one anti-reflection film layer on the velvet surface of a glass substrate (embossed glass). The coated glass of the present invention has at least a double-layer coating. Compared with the coated glass having a single anti-reflection film layer, the light-converting coated glass of the present invention has a higher light transmittance and stronger weather resistance. A small amount of luminescent materials such as quantum dots and phosphor are added to the intermediate light-converting film layer. This luminescent material can absorb the low-utilization bands in sunlight and convert them into bands with high utilization efficiency by solar cells. That is, adding a small amount of luminescent materials to the light-converting film layer of the present invention can effectively absorb the light wavelengths of 300nm - 500nm with low utilization rate in sunlight and convert them into light wavelengths of 550nm - 700nm with higher utilization rate for emission and absorption by solar cells, thereby improving the light conversion efficiency and further increasing the battery conversion efficiency. Since quantum dots are unstable to moisture and oxygen, the light-converting film layer with luminescent materials has poor stability. Therefore, at least one anti-reflection film layer needs to be provided on the surface of the light-converting film layer with luminescent materials to protect the quantum dot luminescent materials in this layer, so as to maintain a high light conversion efficiency and avoid the failure of this layer. Description of the drawings

[0019] Figure 1 It is a schematic cross-sectional structure diagram of the high-efficiency light-converting coated glass of the present invention, where 1 - glass substrate, 2 - light-converting film layer, 3 - anti-reflection film layer, 4 - embossed surface of the glass substrate.

[0020] Figure 2 It is the absorption spectrum and fluorescence spectrum characteristics of the light-converting film layer of the high-efficiency light-converting coated glass of the present invention, where Absorbance represents absorbance and PL intensity represents fluorescence intensity (i.e., photoluminescence intensity). Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments and drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] Unless otherwise specifically stated, the numerical values set forth in these embodiments do not limit the scope of the present invention. Technologies and methods known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies and methods should be regarded as part of the specification. In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as limiting. Accordingly, other examples of the exemplary embodiments may have different values.

[0023] Example 1

[0024] An efficient light-converting coated glass, the structural schematic diagram of its cross-section is as Figure 1 shown, including a glass substrate 1 and a light-converting film layer 2 and an antireflection film layer 3 sequentially coated on the suede surface of the glass substrate 1. The other surface of the glass substrate 1 is an embossed surface 4; the light-converting film layer 2 contains CdTe quantum dots, and the light absorption wavelength of the CdTe quantum dots is 300 nm to 500 nm, and the light emission wavelength is 550 nm to 700 nm.

[0025] Among them, the refractive index of the light-converting film layer 2 is 1.45, and the thickness of the light-converting film layer is 80 nm.

[0026] Among them, the refractive index of the antireflection film layer is 1.3, and the thickness of the antireflection film layer is 110 nm.

[0027] Example 2

[0028] The structure of the efficient light-converting coated glass in this example is the same as that in Example 1, except that the light-converting film layer 2 in this example contains 5 wt% of YAG phosphor.

[0029] Example 3

[0030] The preparation method of the efficient light-converting coated glass in Example 1 includes the following steps:

[0031] (1) Mix CdTe quantum dots with a coating solution and then roll-coat it on the suede surface of the glass substrate 1. After curing at 100 °C for 1 min and then cooling to below 40 °C, a glass substrate 1 with a light-converting film layer 2 is obtained, where the light-converting film layer 2 contains 5 wt% of CdTe quantum dots, its refractive index is 1.45, and the film thickness is 80 nm;

[0032] Then roll-coat the coating solution on the surface of the light-converting film layer 2. After curing at 200 °C for 1 min and then cooling to below 40 °C, a glass substrate 1 with an antireflection film layer 3 is obtained, where the refractive index of the antireflection film layer 3 is 1.3 and the film thickness is 110 nm. Thus, the light-converting coated glass is obtained.

[0033] In this embodiment, the composition and preparation of the coating solution, as well as the refractive index of the corresponding film layer obtained, refer to Chinese Patent 201910592404.7. The composition ratio of the coating solution can be appropriately adjusted according to the refractive index of the corresponding film layer obtained, which can be achieved by those skilled in the art according to the prior art.

[0034] Comparative Example 1

[0035] The coated glass of this comparative example has the same structure as that of Example 1. The difference is that the light conversion film layer 2 of this comparative example is replaced with an antireflection film layer with a refractive index of 1.45 and a film thickness of 80 nm. That is, this comparative example has two antireflection film layers on the matte surface of the glass substrate.

[0036] Example 4

[0037] The coated glass with the structure in Examples 1-2 and Comparative Example 1 is used to prepare a solar photovoltaic encapsulation component. The solar photovoltaic encapsulation component can be obtained by laminating the coated glass, front encapsulation material, battery chip, rear encapsulation material, and backplane glass in Examples 1-2 and Comparative Example 1 in sequence by the lamination method.

[0038] The performance of the encapsulation component is tested, and the results are shown in Table 1. Among them, the gain = (the power data of the example - the power data of Comparative Example 1) ÷ the power data of Comparative Example 1.

[0039] Table 1 Comparison of the performance of the encapsulation components

[0040]

[0041] As can be seen from Table 1, compared with the encapsulation component made of the non-light-converting coated glass of Comparative Example 1, the encapsulation component made of the light-converting coated glass of Example 1 of the present invention can achieve a gain of 1.49%. The high-efficiency light-converting coated glass of the present invention has good weather resistance, and the decline in the light transmittance after PCT aging (temperature 121 °C, humidity 99%, time 96 h) is less than 0.5%.

[0042] A small amount of quantum dot luminescent material is added to the intermediate light conversion film layer 2 of the present invention, which can absorb the low-utilization band in sunlight and convert it into a high-utilization band for solar cells. The absorption spectrum and fluorescence spectrum characteristics of the light conversion film layer 2 in Example 1 are as Figure 2 shown, by Figure 2It can be seen that the film layer added with quantum dots has good absorbance for light wavelengths between 300 nm and 500 nm, and can emit strong fluorescence intensity in the range of light wavelengths of 550 nm to 700 nm. That is, adding a small amount of luminescent material to the light conversion film layer in the present invention can effectively absorb the light wavelengths of 300 nm to 500 nm with low utilization rate in sunlight, and convert them into light wavelengths of 550 nm to 700 nm with high utilization rate for emission to be absorbed by the solar cell, thereby improving the light conversion efficiency and further improving the battery conversion efficiency.

[0043] As described above, the above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An efficient light-converting coated glass, characterized in that, It includes a glass substrate, a light conversion film layer and an antireflection film layer that are successively coated on the matte surface of the glass substrate; the light conversion film layer contains a luminescent material, and the light absorption wavelength of the luminescent material is 300 nm to 500 nm, and the light emission wavelength is 550 nm to 700 nm; The luminescent material is CdTe quantum dots and / or YAG phosphor, and the addition amount of the luminescent material in the light conversion film layer is 0.1 wt% to 20 wt%; The refractive index of the light conversion film layer is 1.42 to 1.48, and the thickness of the light conversion film layer is 60 nm to 150 nm; The antireflection film layer is at least one layer, the refractive index of the antireflection film layer is 1.24 to 1.3, and the thickness of the antireflection film layer is 100 nm to 130 nm.

2. The highly efficient light conversion coated glass according to claim 1, wherein The other surface of the glass substrate is an embossed surface.

3. The preparation method of an efficient light conversion coating glass according to any one of claims 1 to 2, characterized in that, It includes the following steps: mixing the luminescent material with the coating solution and then roll-coating it on the matte surface of the glass substrate, and after curing, a glass substrate with a light conversion film layer is obtained; then roll-coating the coating solution on the surface of the light conversion film layer, and after curing, a glass substrate with an antireflection film layer is obtained, and thus the light conversion coated glass is obtained.

4. Solar photovoltaic encapsulation component, characterized in that The encapsulation assembly includes the light conversion coated glass according to any one of claims 1 to 2.

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