UV light conversion glass for heterojunction solar cell and preparation method and application thereof

Abstract

The application belongs to the field of solar photovoltaics, and discloses a UV light conversion glass for a heterojunction solar cell, which comprises base glass and a UV light conversion material doped in the base glass, wherein the UV light conversion material accounts for 1-10% of the weight percentage of the base glass, the light emission center of the UV light conversion material is Ce 3+ , the structural formula is Na2CaSi6O 14 :Ce or Na2CaSi6O 14 :Ce, Al, and the UV light conversion material further comprises a reducing agent. The application takes advantage of the high light absorption coefficient of Ce 3+ , and explores the application of Ce 3+ doping in the UV light conversion glass, so as to realize the preparation of a UV light conversion glass with low doping concentration and high light absorption coefficient.

Description

Technical Field

[0001] This invention belongs to the field of solar photovoltaics, and particularly relates to a UV conversion glass for heterojunction solar cells, its preparation method and application. Background Technology

[0002] Excessive exposure to ultraviolet (UV) light significantly degrades the efficiency of heterojunction (HJT) solar cells. This is primarily because HJT cells have a multi-layered structure, where the Si-H bonds in the hydrogenated amorphous silicon or microcrystalline silicon layers are easily damaged by UV light, leading to defects and power degradation. Current solutions utilize UV-blocking films to filter UV light; however, these films introduce light loss, limiting the improvement of HJT cell conversion efficiency. UV light transfer coatings, by converting UV light into visible light, effectively address this issue. However, these coatings exhibit poor light and thermal stability, making them unsuitable for long-term outdoor use.

[0003] Photovoltaic glass possesses advantages such as resistance to high and low temperatures, good insulation, and aging resistance. In photovoltaic modules, it plays a crucial role in protecting cells from moisture corrosion and blocking oxygen to prevent oxidation, making it an indispensable component of solar cells. Glass exhibits excellent light and thermal stability. Doping glass with inorganic light-emitting materials converts ultraviolet light into visible light, effectively solving the problem of poor photothermal stability in photoconversion films. However, most inorganic light-conversion materials use Eu... 3+ Doping, Eu 3+ The characteristics of the ff transition result in a low light absorption coefficient for this type of glass, which can only be solved by increasing the doping concentration. However, increasing the doping concentration will lead to a decrease in light transmittance, affecting the battery efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a UV-converting glass for heterojunction solar cells, its preparation method and application, thereby achieving the preparation of UV-converting glass with low doping concentration and high absorption coefficient.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, the present invention provides a UV-converting glass for heterojunction solar cells, the UV-converting glass comprising a matrix glass and a UV-converting material doped in the matrix glass, wherein the UV-converting material accounts for 1% to 10% of the weight of the matrix glass, and the luminescent center of the UV-converting material is Ce. 3+ The structural formula is Na2CaSi6O 14 Ce or Na2CaSi6O 14 Ce, Al; the UV-converting material also includes a reducing agent.

[0007] In the above technical solution, the reducing agent is a carbon rod.

[0008] Secondly, the present invention provides a method for preparing UV-converting glass for heterojunction solar cells, characterized in that: Na2CO3, CaCO3, SiO2, and Ce2(C2O4)3·10H2O are weighed in proportion and ground or shaken evenly, and after being mixed evenly, they are placed together with carbon rods in a heating furnace, and the UV-converting glass is obtained after processing.

[0009] In the above technical solution, the weight ratio of Na2CO3, CaCO3, SiO2, and Ce2(C2O4)3·10H2O3 is (15~20):(15~20):(45~69):(1~10).

[0010] In the above technical solution, the substances weighed in proportion also include Al2O3, wherein the weight ratio of Na2CO3, CaCO3, SiO2, Ce2(C2O4)3·10H2O and Al2O3 is (15~20):(15~20):(45~69):(1~10):(0~5).

[0011] In the above technical solutions, the processing time in the heating furnace is 3 to 6 hours.

[0012] In the above technical solutions, the heating temperature in the heating furnace is 800-1600℃.

[0013] Thirdly, the present invention provides the above-mentioned UV-converting glass and the application of the UV-converting glass prepared by the above-mentioned preparation method in solar cells.

[0014] The beneficial effects of this invention are as follows:

[0015] Ce 3+ Ions, due to their df transition characteristics, inherently possess high absorption coefficients. This invention utilizes Ce... 3+ The advantages of high absorption coefficient were explored, and Ce doping in UV-converting glass was investigated. 3+ The application of Ce enables the fabrication of UV-converting glasses with low doping concentration and high absorption coefficient. 3+ It has reducing properties; high temperatures will cause it to oxidize into non-luminescent Ce. 4+ This results in low overall light conversion efficiency of the prepared UV-converting glass. Therefore, this invention selects Ce as the carbon rod. 3+ A reducing atmosphere is provided to prevent oxidation, and the reducing atmosphere is adjusted by controlling the amount of carbon rods added during the glass sintering process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery structure of the present invention;

[0018] Figure 2 The emission spectrum of the UV-converting glass obtained in Example 2 of this invention;

[0019] Figure 3 This is the absorption spectrum of the UV-converting glass obtained in Example 2 of the present invention. Detailed Implementation

[0020] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0021] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0022] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0023] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The drawings only show the components related to this disclosure and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0024] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0025] This invention provides a UV conversion glass for heterojunction solar cells, its preparation method, and its application, comprising the following steps:

[0026] (1) Weigh Na2CO3, CaCO3, SiO2, Ce2(C2O4)3·10H2O and Al2O3 according to the proportion and grind or shake them evenly. After mixing evenly, place them together with carbon rods in a heating furnace and process them to obtain UV-converted glass.

[0027] (2) The weight ratio of Na2CO3, CaCO3, SiO2, Ce2(C2O4)3·10H2O and Al2O3 is: (15~20): (15~20): (45~69): (1~10): (0~5).

[0028] (3) The processing time is 3 to 6 hours.

[0029] (4) The heating temperature is 800 to 1600 degrees Celsius.

[0030] It should be noted that the iron content in the UV-converting glass and the raw materials used in its preparation is controlled below 150 ppm. The thickness of the resulting UV-converting glass is not limited and can be 3.2 mm, 4 mm, etc.

[0031] The following examples and comparative examples provide further illustration.

[0032] Example 1 Na2CaSi6O 14 :Ce

[0033] Weigh out Na2CO3, CaCO3, SiO2, and Ce2(C2O4)3·10H2O according to the specified proportions, and weigh out the corresponding amount of carbon rods. Mix Na2CO3, CaCO3, SiO2, and Ce2(C2O4)3·10H2O, grind or shake well, and place them together with the carbon rods in a heating furnace for processing to obtain UV-converting glass.

[0034] The weight ratio of Na₂CO₃, CaCO₃, SiO₂, and Ce₂(C₂O₄)₃·10H₂O is 18:17:60:5. The mixture is heated in a furnace for 3 hours at 1500℃. After cooling, flat glass is produced using either a float glass or rolling process. Finally, UV-converted glass is obtained through annealing. The annealing process involves natural cooling to room temperature.

[0035] Tests showed that its quantum yield can reach 88%.

[0036] Example 2 Na2CaSi6O 14 :Ce,Al:

[0037] Weigh out Na₂CO₃, CaCO₃, SiO₂, Ce₂(C₂O₄)₃·10H₂O, and Al₂O₃ according to the specified proportions, and weigh out the corresponding amounts of carbon rods. Mix Na₂CO₃, CaCO₃, SiO₂, Ce₂(C₂O₄)₃·10H₂O, and Al₂O₃, then grind or shake well. Place the mixture together with the carbon rods in a heating furnace for processing to obtain UV-converting glass.

[0038] The weight ratio of Na₂CO₃, CaCO₃, SiO₂, Ce₂(C₂O₄)₃·10H₂O, and Al₂O₃ is 18:17:60:5:0.02. The mixture is heated in a furnace for 3 hours at 1500℃. After cooling, flat glass is produced using either a float glass or rolling process. Finally, UV-converted glass is obtained through annealing. The annealing process involves natural cooling to room temperature.

[0039] Tests showed that its quantum yield could reach 93%. Figure 2 The emission spectrum of this UV-converting glass shows that it has a strong luminescence intensity in the vicinity of 400–500 nm. Figure 2 The absorption spectrum of the UV-converting glass shows that its light absorption region is in the ultraviolet region below 400nm, and it has no effect on the light transmittance in the visible light region.

[0040] Comparative Example 1

[0041] Weigh out Na2CO3, CaCO3, and SiO2 according to the proportions, mix them, grind or shake them well, and then place them in a heating furnace for processing to obtain glass without light-converting materials.

[0042] The weight ratio of Na₂CO₃, CaCO₃, and SiO₂ is 18:17:60:5. The mixture is heated in a furnace for 3 hours at 1500℃. After cooling, flat glass is produced using either the float glass or rolling process. Finally, an annealing process is performed to obtain glass without the light-converting material. The annealing process involves natural cooling to room temperature.

[0043] Comparative Example 2

[0044] Weigh out Na2CO3, CaCO3, SiO2 and Al2O3 according to the proportions, mix them, grind or shake them well, and then place them in a heating furnace for processing to obtain glass without light-converting materials.

[0045] The weight ratio of Na₂CO₃, CaCO₃, SiO₂, and Al₂O₃ is 18:17:60:5:0.02. The mixture is heated in a furnace for 3 hours at 1500℃. After cooling, flat glass is produced using either the float glass or rolling process. Finally, an annealing process is performed to obtain glass without the light-converting material. The annealing process involves natural cooling to room temperature.

[0046] Comparative Example 3

[0047] Weigh out SiO2, Na2O, CaO, MgO, Al2O3, and Y2O3 according to the specified proportions:Eu 3+ Weigh out the corresponding amounts of graphite powder and flux CaF2. Mix the above materials and grind or shake them well. Place them together with carbon rods in a heating furnace for processing to obtain UV-converting glass.

[0048] Among them, SiO2, Na2O, CaO, MgO, Al2O3 and Y2O3:Eu 3+ The weight ratio is 70:15:10:2:2:1. It is placed in a heating furnace and heated for 3 hours at a temperature of 1300℃. After cooling, flat glass is produced using either the float glass or rolling process. Finally, UV-converted glass is obtained through an annealing process. The annealing process involves natural cooling to room temperature.

[0049] Comparative Example 4

[0050] Weigh out SiO2, Na2O, CaO, MgO, Al2O3, and Y3Al5O according to the specified proportions. 12 :Ce 3+ Weigh out the corresponding amounts of carbon black powder and flux NH4F. Mix the above materials and grind or shake them well. Place them together with the carbon rod in a heating furnace for processing to obtain UV-converting glass.

[0051] Among them, SiO2, Na2O, CaO, MgO, Al2O3 and Y3Al5O 12 :Ce 3+ The weight ratio is 70:15:10:2:2:1. It is placed in a heating furnace and heated for 4 hours at a temperature of 1400℃. After cooling, flat glass is produced using either the float glass or rolling process. Finally, UV-converted glass is obtained through an annealing process. The annealing process involves natural cooling to room temperature.

[0052] Comparative Example 5

[0053] Weigh out SiO2, Na2O, CaO, MgO, Al2O3, and Ba2SiO4:Eu according to the specified proportions. 3+ Weigh out the corresponding amounts of carbon black powder and flux NH4F. Mix the above materials and grind or shake them well. Place them together with the carbon rod in a heating furnace for processing to obtain UV-converting glass.

[0054] Among them, SiO2, Na2O, CaO, MgO, Al2O3 and Y3Al5O 12 :Ce 3+ The weight ratio is 70:15:10:2:2:1. It is placed in a heating furnace and heated for 4 hours at a temperature of 1400℃. After cooling, flat glass is produced using either the float glass or rolling process. Finally, UV-converted glass is obtained through an annealing process. The annealing process involves natural cooling to room temperature.

[0055] Comparative Example 6

[0056] Weigh out Na2CO3, CaCO3, SiO2, and Ce2(C2O4)3·10H2O according to the specified proportions, and weigh out the corresponding amount of graphite powder. Mix Na2CO3, CaCO3, SiO2, and Ce2(C2O4)3·10H2O, grind or shake well, and place them together with the graphite powder in a heating furnace for processing to obtain UV-converting glass.

[0057] The weight ratio of Na₂CO₃, CaCO₃, SiO₂, and Ce₂(C₂O₄)₃·10H₂O is 18:17:60:5. The mixture is heated in a furnace for 3 hours at 1500℃. After cooling, flat glass is produced using either a float glass or rolling process. Finally, UV-converted glass is obtained through annealing. The annealing process involves natural cooling to room temperature.

[0058] Table 1. Quantum yield and cell efficiency data of the glasses obtained in Examples 1-2 and Control Groups 1-6.

[0059] Example 1 88 23.30 Example 2 93 23.43 Comparative Example 1 0 22.23 Comparative Example 2 0 22.18 Comparative Example 3 72 22.35 Comparative Example 4 70 22.20 Comparative Example 5 77 23.15 Control group 6 80 23.06

[0060] As can be seen from the above, the UV light conversion material used in the preparation methods of Examples 1-2 has the structural formula Na2CaSi6O. 14 Ce or Na2CaSi6O 14 The UV-conversion glass prepared using Ce, Al, and carbon rods as reducing agents exhibits higher quantum yield and higher cell efficiency. The specific structure of the test cell prepared using photovoltaic glass is shown below. Figure 1 As shown.

[0061] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A UV-converting glass for heterojunction solar cells, the UV-converting glass comprising a matrix glass and a UV-converting material doped in the matrix glass, wherein the UV-converting material accounts for 1% to 10% of the weight of the matrix glass, characterized in that: The luminescent center of the UV-converting material is Ce. 3+ The structural formula is Na2CaSi6O 14 Ce or Na2CaSi6O 14 Ce, Al; the UV conversion material also includes carbon rods; The preparation method of the UV-converting glass is as follows: Na2CO3, CaCO3, SiO2, Ce2 (C2O4)3 ·10H2O and Al2O3 are weighed according to the proportion and ground or shaken evenly. After being mixed evenly, they are placed in a heating furnace together with carbon rods and processed to obtain the UV-converting glass. The weight ratio of Na2CO3, CaCO3, SiO2, Ce2(C2O4)3·10H2O and Al2O3 is (15~20):(15~20):(45 ~ 69):(1~10):(0~5).

2. A method for preparing UV-converting glass as described in claim 1, characterized in that: The preparation method is as follows: Na2CO3, CaCO3, SiO2, Ce2(C2O4)3·10H2O and Al2O3 are weighed according to the proportion and ground or shaken evenly. After being mixed evenly, they are placed in a heating furnace together with carbon rods and processed to obtain the UV-converting glass. The weight ratio of Na2CO3, CaCO3, SiO2, Ce2(C2O4)3·10H2O and Al2O3 is (15~20):(15~20):(45 ~ 69):(1~10):(0~5).

3. The preparation method according to claim 2, characterized in that: The processing time in the heating furnace is 3 to 6 hours.

4. The preparation method according to claim 2, characterized in that: The heating temperature in the furnace is 800–1600℃.

5. The application of the UV-converting glass according to claim 1 or the UV-converting glass prepared by any one of the preparation methods of claims 2-4 in solar cells.

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