Single-crystal double-sided double-glass photovoltaic module material and preparation method thereof

Abstract

The invention relates to the technical field of double-glass photovoltaic module materials, and discloses a single-crystal double-sided double-glass photovoltaic module material which comprises upper-layer tempered glass, a first packaging layer, a solar cell, a second packaging layer, a third packaging layer and lower-layer glass. The solar cell comprises an aluminum back surface field, a silicon wafer, a diffusion layer, a passivation layer and a silicon nitride layer which are stacked in sequence, the silicon dioxide passivation layer serving as an internal material is added, sodium ions in upper-layer tempered glass and lower-layer glass can be prevented from migrating to the silicon wafer, so that excellent anti-PID performance is obtained, the passivation layer has a good passivation effect, and the service life of the solar cell is prolonged. In addition, ultraviolet light can be absorbed and converted into blue light capable of generating electricity through the light conversion film layer, it is guaranteed that the battery piece is not damaged by the ultraviolet light, meanwhile, the energy of the ultraviolet light can be utilized for efficiency improvement, and therefore the conversion efficiency of the device is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of double-glass photovoltaic module materials, and in particular to a single-crystal double-sided double-glass photovoltaic module material and a preparation method thereof. Background Art

[0002] As a clean, renewable energy source, solar energy has attracted more and more attention, and its application is becoming more and more extensive. Currently, one of the most important applications of solar energy is photovoltaic power generation. The most basic unit of solar photovoltaic power generation is a solar cell. In specific applications, multiple solar cells are usually packaged into photovoltaic modules according to a certain structure. When used, the photovoltaic modules are connected in series and in parallel, and then connected to the inverter to form an AC output. The photovoltaic modules widely used at present are basically composed of ultra-white low-iron tempered glass, two layers of EVA, solar cells set between the two layers of EVA, and backplanes. These components are heated and laminated under vacuum to form a whole, and finally installed with aluminum alloy frames and junction boxes to become photovoltaic modules.

[0003] For example, the Chinese patent application number 201811577092.4 is a double-glass photovoltaic module and its preparation method. In this invention, the solar cells are positioned by setting grooves matching the solar cells on the surface of the lower glass, so that there is a consistent spacing between the solar cells after lamination; the fluorescent reflective coating selectively converts and reflects the sunlight incident on the gap area of ​​the solar cells, thereby improving the light energy utilization rate of the module and improving the overall output power and conversion efficiency of the module.

[0004] However, the above patent and existing double-glass solar photovoltaic modules have poor PID effect (potential induced decay effect) in actual application, resulting in low actual conversion efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a single crystal double-sided double-glass photovoltaic module material and a preparation method, which solves the problems raised in the background technology.

[0006] The embodiment of the present application provides a single-crystal double-sided double-glass photovoltaic module material, including an upper tempered glass, a first packaging layer, a solar cell, a second packaging layer, a third packaging layer and a lower glass, the solar cell includes an aluminum back field, a silicon wafer, a diffusion layer, a passivation layer and a silicon nitride layer stacked in sequence, the first packaging layer, the second packaging layer and the third packaging layer all include resin, glass fiber woven cloth and a light transfer film layer.

[0007] Optionally, the material of the passivation layer is silicon dioxide, and the thickness of the passivation layer is 4 to 5 nanometers.

[0008] Optionally, the resin includes a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, an epoxy resin, an initiator, a curing agent and a curing accelerator, and the mass ratio of the random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, the epoxy resin, the initiator, the curing agent and the curing accelerator is 100: (950-1200): (0.1-2): (950-970): (20-30).

[0009] Optionally, the light conversion film layer is made by compounding a high-transmittance packaging film and a wavelength conversion material.

[0010] Optionally, the wavelength conversion material is a light conversion agent.

[0011] Optionally, the lower layer of glass includes a glass substrate and a silicon dioxide layer stacked in sequence.

[0012] Optionally, the silicon dioxide layer has a thickness of 90 to 110 nanometers.

[0013] Optionally, there are multiple solar cells, and the multiple solar cells are connected in series.

[0014] A method for preparing a single crystal double-sided double-glass photovoltaic module material, the specific steps are as follows: Step 1, providing a silicon wafer, an upper tempered glass and a light transfer film layer; Step 2, preparing a solar cell, sequentially preparing a diffusion layer, a passivation layer and a silicon nitride layer on one surface of the silicon wafer, and preparing an aluminum back surface field on the surface of the silicon wafer opposite to the diffusion layer, to obtain a solar cell; Step three, prepare the first encapsulation layer, the second encapsulation layer and the third encapsulation layer, use DMSO as solvent and N2 as protective gas, mix acrylic acid, hexafluorobutyl acrylate and epoxy acrylate, add initiator, heat and reflux at 70-80°C for 1-2h to obtain a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, then add epoxy resin, curing agent and curing accelerator at 110-130°C, stir and mix to obtain a mixed resin, then evacuate at 20-25°C for 3-5min, pour into a mold and combine with glass fiber woven cloth, first evacuate the mold, the vacuum pressure is <0.01MPa, and then program the temperature to heat and press to obtain a packaging composite material, and finally adhere the light transfer film layer in step one to the surface of the packaging composite material; Step 4, welding a plurality of solar cells in step 2 into one piece through a plurality of conductors; Step 5, stacking the upper tempered glass, the first encapsulation layer, the solar cell, the second encapsulation layer, the third encapsulation layer and the lower glass in sequence to obtain a laminate; Step 6: laminating the laminated body in step 5 at 90-130°C for the first time, and then laminating it at 130-150°C for the second time.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects: The technical solution of the present application, by adding an internal material as a silicon dioxide passivation layer, can not only block the sodium ions in the upper tempered glass and the lower glass from migrating to the silicon wafer, thereby obtaining excellent anti-PID performance, but also the passivation layer has a good passivation effect, thereby enhancing the ultraviolet tolerance of the film layer. In addition, the light conversion film layer can absorb ultraviolet light and convert it into blue light that can generate electricity. While ensuring that the battery cell is not damaged by ultraviolet rays, the energy of ultraviolet rays can be utilized for efficiency enhancement, thereby greatly improving the conversion efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 This is the initial EL diagram of the double-glass solar photovoltaic module of Example 1 in the material and preparation method of a single-crystal double-sided double-glass photovoltaic module of the present invention; Figure 2 This is the EL graph of the double-glass solar photovoltaic module of Example 1 in the material and preparation method of a single-crystal double-sided double-glass photovoltaic module of the present invention after 4 days. DETAILED DESCRIPTION

[0017] Example 1 See also Figure 1-2 The present invention provides a technical solution: a single crystal double-sided double-glass photovoltaic module material, including an upper tempered glass, a first packaging layer, a solar cell, a second packaging layer, a third packaging layer and a lower glass, the solar cell includes an aluminum back field, a silicon wafer, a diffusion layer, a passivation layer and a silicon nitride layer stacked in sequence, the first packaging layer, the second packaging layer and the third packaging layer all include resin, glass fiber woven cloth and a light transfer film layer.

[0018] In an embodiment of the present application, the material of the passivation layer is silicon dioxide, and the thickness of the passivation layer is 4 nanometers.

[0019] In an embodiment of the present application, the resin includes a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, an epoxy resin, an initiator, a curing agent and a curing accelerator, and the mass ratio of the random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, the epoxy resin, the initiator, the curing agent and the curing accelerator is 100:950:0.1:950:20.

[0020] Optionally, the light conversion film layer is made by compounding a high-transmittance packaging film and a wavelength conversion material.

[0021] In an embodiment of the present application, the wavelength conversion material is a light conversion agent.

[0022] In an embodiment of the present application, the lower layer of glass includes a glass substrate and a silicon dioxide layer stacked in sequence.

[0023] In an embodiment of the present application, the thickness of the silicon dioxide layer is 90 nanometers.

[0024] In an embodiment of the present application, there are a plurality of solar cells, and the plurality of solar cells are connected in series.

[0025] A method for preparing a single crystal double-sided double-glass photovoltaic module material, the specific steps are as follows: Step 1, providing a silicon wafer, an upper tempered glass and a light transfer film layer; Step 2, preparing a solar cell, sequentially preparing a diffusion layer, a passivation layer and a silicon nitride layer on one surface of the silicon wafer, and preparing an aluminum back surface field on the surface of the silicon wafer opposite to the diffusion layer, to obtain a solar cell; Step three, prepare the first encapsulation layer, the second encapsulation layer and the third encapsulation layer, use DMSO as solvent and N2 as protective gas, mix acrylic acid, hexafluorobutyl acrylate and epoxy acrylate, add initiator, heat and reflux at 70°C for 1h to obtain a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, then add epoxy resin, curing agent and curing accelerator at 110°C, stir and mix to obtain a mixed resin, then evacuate at 20°C for 3min, pour into a mold and combine with glass fiber woven cloth, first evacuate the mold, the vacuum pressure is <0.01MPa, then program the temperature to hot press to obtain a packaging composite material, and finally adhere the light transfer film layer in step one to the surface of the packaging composite material; Step 4, welding a plurality of solar cells in step 2 into one piece through a plurality of conductors; Step 5, stacking the upper tempered glass, the first encapsulation layer, the solar cell, the second encapsulation layer, the third encapsulation layer and the lower glass in sequence to obtain a laminate; Step six, laminating the laminate in step five once at 90°C, and then laminating it twice at 130°C.

[0026] Example 2 The present invention provides a technical solution: a single crystal double-sided double-glass photovoltaic module material, comprising an upper tempered glass, a first packaging layer, a solar cell, a second packaging layer, a third packaging layer and a lower glass, wherein the solar cell comprises an aluminum back surface field, a silicon wafer, a diffusion layer, a passivation layer and a silicon nitride layer stacked in sequence, and the first packaging layer, the second packaging layer and the third packaging layer all comprise resin, glass fiber woven cloth and a light transfer film layer.

[0027] In an embodiment of the present application, the material of the passivation layer is silicon dioxide, and the thickness of the passivation layer is 4 nanometers.

[0028] In an embodiment of the present application, the resin includes a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, an epoxy resin, an initiator, a curing agent and a curing accelerator, and the mass ratio of the random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, the epoxy resin, the initiator, the curing agent and the curing accelerator is 100:1000:0.5:955:22.

[0029] Optionally, the light conversion film layer is made by compounding a high-transmittance packaging film and a wavelength conversion material.

[0030] In an embodiment of the present application, the wavelength conversion material is a light conversion agent.

[0031] In an embodiment of the present application, the lower layer of glass includes a glass substrate and a silicon dioxide layer stacked in sequence.

[0032] In an embodiment of the present application, the thickness of the silicon dioxide layer is 95 nanometers.

[0033] In an embodiment of the present application, there are a plurality of solar cells, and the plurality of solar cells are connected in series.

[0034] A method for preparing a single crystal double-sided double-glass photovoltaic module material, the specific steps are as follows: Step 1, providing a silicon wafer, an upper tempered glass and a light transfer film layer; Step 2, preparing a solar cell, sequentially preparing a diffusion layer, a passivation layer and a silicon nitride layer on one surface of the silicon wafer, and preparing an aluminum back surface field on the surface of the silicon wafer opposite to the diffusion layer, to obtain a solar cell; Step three, prepare the first encapsulation layer, the second encapsulation layer and the third encapsulation layer, use DMSO as solvent and N2 as protective gas, mix acrylic acid, hexafluorobutyl acrylate and epoxy acrylate, add initiator, heat and reflux at 70°C for 1h to obtain a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, then add epoxy resin, curing agent and curing accelerator at 110°C, stir and mix to obtain a mixed resin, then evacuate at 20°C for 3min, pour into a mold and combine with glass fiber woven cloth, first evacuate the mold, the vacuum pressure is <0.01MPa, then program the temperature to hot press to obtain a packaging composite material, and finally adhere the light transfer film layer in step one to the surface of the packaging composite material; Step 4, welding a plurality of solar cells in step 2 into one piece through a plurality of conductors; Step 5, stacking the upper tempered glass, the first encapsulation layer, the solar cell, the second encapsulation layer, the third encapsulation layer and the lower glass in sequence to obtain a laminate; Step six, laminating the laminate in step five once at 90°C, and then laminating it twice at 130°C.

[0035] Example 3 The present invention provides a technical solution: a single crystal double-sided double-glass photovoltaic module material, comprising an upper tempered glass, a first packaging layer, a solar cell, a second packaging layer, a third packaging layer and a lower glass, wherein the solar cell comprises an aluminum back surface field, a silicon wafer, a diffusion layer, a passivation layer and a silicon nitride layer stacked in sequence, and the first packaging layer, the second packaging layer and the third packaging layer all comprise resin, glass fiber woven cloth and a light transfer film layer.

[0036] In an embodiment of the present application, the material of the passivation layer is silicon dioxide, and the thickness of the passivation layer is 4 nanometers.

[0037] In an embodiment of the present application, the resin includes a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, an epoxy resin, an initiator, a curing agent and a curing accelerator, and the mass ratio of the random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, the epoxy resin, the initiator, the curing agent and the curing accelerator is 100:1100:1:960:25.

[0038] Optionally, the light conversion film layer is made by compounding a high-transmittance packaging film and a wavelength conversion material.

[0039] In an embodiment of the present application, the wavelength conversion material is a light conversion agent.

[0040] In an embodiment of the present application, the lower layer of glass includes a glass substrate and a silicon dioxide layer stacked in sequence.

[0041] In an embodiment of the present application, the thickness of the silicon dioxide layer is 90 nanometers.

[0042] In an embodiment of the present application, there are a plurality of solar cells, and the plurality of solar cells are connected in series.

[0043] A method for preparing a single crystal double-sided double-glass photovoltaic module material, the specific steps are as follows: Step 1, providing a silicon wafer, an upper tempered glass and a light transfer film layer; Step 2, preparing a solar cell, sequentially preparing a diffusion layer, a passivation layer and a silicon nitride layer on one surface of the silicon wafer, and preparing an aluminum back surface field on the surface of the silicon wafer opposite to the diffusion layer, to obtain a solar cell; Step three, prepare the first encapsulation layer, the second encapsulation layer and the third encapsulation layer, use DMSO as solvent and N2 as protective gas, mix acrylic acid, hexafluorobutyl acrylate and epoxy acrylate, add initiator, heat and reflux at 70°C for 1h to obtain a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, then add epoxy resin, curing agent and curing accelerator at 110°C, stir and mix to obtain a mixed resin, then evacuate at 20°C for 3min, pour into a mold and combine with glass fiber woven cloth, first evacuate the mold, the vacuum pressure is <0.01MPa, then program the temperature to hot press to obtain a packaging composite material, and finally adhere the light transfer film layer in step one to the surface of the packaging composite material; Step 4, welding a plurality of solar cells in step 2 into one piece through a plurality of conductors; Step 5, stacking the upper tempered glass, the first encapsulation layer, the solar cell, the second encapsulation layer, the third encapsulation layer and the lower glass in sequence to obtain a laminate; Step six, laminating the laminate in step five once at 90°C, and then laminating it twice at 130°C.

[0044] Example 4 The present invention provides a technical solution: a single crystal double-sided double-glass photovoltaic module material, comprising an upper tempered glass, a first packaging layer, a solar cell, a second packaging layer, a third packaging layer and a lower glass, wherein the solar cell comprises an aluminum back surface field, a silicon wafer, a diffusion layer, a passivation layer and a silicon nitride layer stacked in sequence, and the first packaging layer, the second packaging layer and the third packaging layer all comprise resin, glass fiber woven cloth and a light transfer film layer.

[0045] In an embodiment of the present application, the material of the passivation layer is silicon dioxide, and the thickness of the passivation layer is 4 nanometers.

[0046] In an embodiment of the present application, the resin includes a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, an epoxy resin, an initiator, a curing agent and a curing accelerator, and the mass ratio of the random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, the epoxy resin, the initiator, the curing agent and the curing accelerator is 100:1200:2:970:30.

[0047] Optionally, the light conversion film layer is made by compounding a high-transmittance packaging film and a wavelength conversion material.

[0048] In an embodiment of the present application, the wavelength conversion material is a light conversion agent.

[0049] In an embodiment of the present application, the lower layer of glass includes a glass substrate and a silicon dioxide layer stacked in sequence.

[0050] In an embodiment of the present application, the thickness of the silicon dioxide layer is 90 nanometers.

[0051] In an embodiment of the present application, there are a plurality of solar cells, and the plurality of solar cells are connected in series.

[0052] A method for preparing a single crystal double-sided double-glass photovoltaic module material, the specific steps are as follows: Step 1, providing a silicon wafer, an upper tempered glass and a light transfer film layer; Step 2, preparing a solar cell, sequentially preparing a diffusion layer, a passivation layer and a silicon nitride layer on one surface of the silicon wafer, and preparing an aluminum back surface field on the surface of the silicon wafer opposite to the diffusion layer, to obtain a solar cell; Step three, prepare the first encapsulation layer, the second encapsulation layer and the third encapsulation layer, use DMSO as solvent and N2 as protective gas, mix acrylic acid, hexafluorobutyl acrylate and epoxy acrylate, add initiator, heat and reflux at 70°C for 1h to obtain a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, then add epoxy resin, curing agent and curing accelerator at 110°C, stir and mix to obtain a mixed resin, then evacuate at 20°C for 3min, pour into a mold and combine with glass fiber woven cloth, first evacuate the mold, the vacuum pressure is <0.01MPa, then program the temperature to hot press to obtain a packaging composite material, and finally adhere the light transfer film layer in step one to the surface of the packaging composite material; Step 4, welding a plurality of solar cells in step 2 into one piece through a plurality of conductors; Step 5, stacking the upper tempered glass, the first encapsulation layer, the solar cell, the second encapsulation layer, the third encapsulation layer and the lower glass in sequence to obtain a laminate; Step six, laminating the laminate in step five once at 90°C, and then laminating it twice at 130°C.

[0053] Comparative Example 1 The present invention provides a technical solution: a single crystal double-sided double-glass photovoltaic module material, comprising an upper tempered glass, a first packaging layer, a solar cell, a second packaging layer, a third packaging layer and a lower glass, the solar cell comprising an aluminum back field, a silicon wafer, a diffusion layer and a silicon nitride layer stacked in sequence, the first packaging layer, the second packaging layer and the third packaging layer all comprising resin, glass fiber woven cloth and a light transfer film layer.

[0054] In an embodiment of the present application, the resin includes a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, an epoxy resin, an initiator, a curing agent and a curing accelerator, and the mass ratio of the random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, the epoxy resin, the initiator, the curing agent and the curing accelerator is 100:950:0.1:950:20.

[0055] Optionally, the light conversion film layer is made by compounding a high-transmittance packaging film and a wavelength conversion material.

[0056] In an embodiment of the present application, the wavelength conversion material is a light conversion agent.

[0057] In an embodiment of the present application, the lower layer of glass includes a glass substrate and a silicon dioxide layer stacked in sequence.

[0058] In an embodiment of the present application, the thickness of the silicon dioxide layer is 90 nanometers.

[0059] In an embodiment of the present application, there are a plurality of solar cells, and the plurality of solar cells are connected in series.

[0060] A method for preparing a single crystal double-sided double-glass photovoltaic module material, the specific steps are as follows: Step 1, providing a silicon wafer, an upper tempered glass and a light transfer film layer; Step 2, preparing a solar cell, sequentially preparing a diffusion layer and a silicon nitride layer on one surface of the silicon wafer, and preparing an aluminum back surface field on the surface of the silicon wafer opposite to the diffusion layer, to obtain a solar cell; Step three, prepare the first encapsulation layer, the second encapsulation layer and the third encapsulation layer, use DMSO as solvent and N2 as protective gas, mix acrylic acid, hexafluorobutyl acrylate and epoxy acrylate, add initiator, heat and reflux at 70°C for 1h to obtain a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, then add epoxy resin, curing agent and curing accelerator at 110°C, stir and mix to obtain a mixed resin, then evacuate at 20°C for 3min, pour into a mold and combine with glass fiber woven cloth, first evacuate the mold, the vacuum pressure is <0.01MPa, then program the temperature to hot press to obtain a packaging composite material, and finally adhere the light transfer film layer in step one to the surface of the packaging composite material; Step 4, welding a plurality of solar cells in step 2 into one piece through a plurality of conductors; Step 5, stacking the upper tempered glass, the first encapsulation layer, the solar cell, the second encapsulation layer, the third encapsulation layer and the lower glass in sequence to obtain a laminate; Step six, laminating the laminate in step five once at 90°C, and then laminating it twice at 130°C.

[0061] Comparative Example 2 The present invention provides a technical solution: a single crystal double-sided double-glass photovoltaic module material, comprising an upper tempered glass, a first packaging layer, a solar cell, a second packaging layer, a third packaging layer and a lower glass, wherein the solar cell comprises an aluminum back surface field, a silicon wafer, a diffusion layer, a passivation layer and a silicon nitride layer stacked in sequence, and the first packaging layer, the second packaging layer and the third packaging layer all comprise resin and glass fiber woven cloth.

[0062] In an embodiment of the present application, the material of the passivation layer is silicon dioxide, and the thickness of the passivation layer is 4 nanometers.

[0063] In an embodiment of the present application, the resin includes a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, an epoxy resin, an initiator, a curing agent and a curing accelerator, and the mass ratio of the random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, the epoxy resin, the initiator, the curing agent and the curing accelerator is 100:950:0.1:950:20.

[0064] In an embodiment of the present application, the lower layer of glass includes a glass substrate and a silicon dioxide layer stacked in sequence.

[0065] In an embodiment of the present application, the thickness of the silicon dioxide layer is 90 nanometers.

[0066] In an embodiment of the present application, there are a plurality of solar cells, and the plurality of solar cells are connected in series.

[0067] A method for preparing a single crystal double-sided double-glass photovoltaic module material, the specific steps are as follows: Step 1, providing a silicon wafer and an upper layer of tempered glass; Step 2, preparing a solar cell, sequentially preparing a diffusion layer, a passivation layer and a silicon nitride layer on one surface of the silicon wafer, and preparing an aluminum back surface field on the surface of the silicon wafer opposite to the diffusion layer, to obtain a solar cell; Step 3, preparing the first encapsulation layer, the second encapsulation layer and the third encapsulation layer, using DMSO as a solvent and N2 as a protective gas, mixing acrylic acid, hexafluorobutyl acrylate and epoxy acrylate, adding an initiator, heating and reflux at 70°C for 1-2h to obtain a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, and then adding epoxy resin, a curing agent and a curing accelerator at 110°C, stirring and mixing to obtain a mixed resin, and then vacuuming at 20°C for 3min, pouring into a mold and combining with a glass fiber woven cloth, first vacuuming the mold, the vacuum pressure is <0.01MPa, and then programmed heating and hot pressing to obtain a packaging composite material; Step 4, welding a plurality of solar cells in step 2 into one piece through a plurality of conductors; Step 5, stacking the upper tempered glass, the first encapsulation layer, the solar cell, the second encapsulation layer, the third encapsulation layer and the lower glass in sequence to obtain a laminate; Step six, laminating the laminate in step five once at 90°C, and then laminating it twice at 130°C.

[0068] The performance parameters of the double-glass solar photovoltaic modules of Examples 1-5 and Comparative Examples 1-2 are shown in Table 1 below. It can be seen from Table 1 below that the Pmax of the double-glass solar photovoltaic modules of Examples 1-5 are higher than the Pmax of the double-glass solar photovoltaic modules of Comparative Examples 1-2. Under the same incident light intensity Pin, the conversion efficiency PCE=Pmax / Pin of Examples 1-5 is significantly higher than that of Comparative Examples 1-2.

[0069] Table 2 shows the performance parameter changes of the double-glass solar photovoltaic module of Example 1 after 4 days under the conditions of 85°C, 85% humidity and -1000V. It can be seen from Table 2 that under the above conditions, after 4 days, the parameters of the double-glass solar photovoltaic module of Example 1 have no obvious changes, and the power attenuation is almost 0%.

[0070] Table 1:

[0071] Table 2:

[0072] It can be seen that in this application, by adding a silicon dioxide passivation layer as an internal material, it is not only possible to block the sodium ions in the upper tempered glass and the lower glass from migrating to the silicon wafer, thereby obtaining excellent anti-PID performance, but also the passivation layer has a good passivation effect, thereby enhancing the ultraviolet tolerance of the film layer. In addition, the light conversion film layer can absorb ultraviolet light and convert it into blue light that can generate electricity. While ensuring that the battery cell is not damaged by ultraviolet rays, the energy of ultraviolet rays can be utilized for efficiency improvement, thereby greatly improving the conversion efficiency of the device.

Claims

1. A single crystal double-sided double-glass photovoltaic module material, characterized by: It includes an upper layer of tempered glass, a first packaging layer, a solar cell, a second packaging layer, a third packaging layer and a lower layer of glass. The solar cell includes an aluminum back field, a silicon wafer, a diffusion layer, a passivation layer and a silicon nitride layer stacked in sequence. The first packaging layer, the second packaging layer and the third packaging layer all include resin, glass fiber woven cloth and a light transfer film layer.

2. A single crystal double-sided double-glass photovoltaic module material according to claim 1, characterized in that: The material of the passivation layer is silicon dioxide, and the thickness of the passivation layer is 4-5 nanometers.

3. The single crystal double-sided double-glass photovoltaic module material according to claim 1, characterized in that: The resin comprises a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, an epoxy resin, an initiator, a curing agent and a curing accelerator, and the mass ratio of the random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, the epoxy resin, the initiator, the curing agent and the curing accelerator is 100: (950-1200): (0.1-2): (950-970): (20-30).

4. The single crystal double-sided double-glass photovoltaic module material according to claim 1, characterized in that: The light conversion film layer is made by compounding a high-transmittance packaging film and a wavelength conversion material.

5. The single crystal double-sided double-glass photovoltaic module material according to claim 4, characterized in that: The wavelength conversion material is a light conversion agent.

6. The single crystal double-sided double-glass photovoltaic module material according to claim 1, characterized in that: The lower layer of glass comprises a glass substrate and a silicon dioxide layer which are stacked in sequence.

7. A single crystal double-sided double-glass photovoltaic module material according to claim 6, characterized in that: The thickness of the silicon dioxide layer is 90 to 110 nanometers.

8. The single crystal double-sided double-glass photovoltaic module material according to claim 1, characterized in that: There are a plurality of solar cells, and the plurality of solar cells are connected in series.

9. The method for preparing a single crystal double-sided double-glass photovoltaic module material according to claim 1, characterized in that: The specific steps are as follows: Step 1, providing a silicon wafer, an upper tempered glass layer and a light transfer film layer; Step 2, preparing a solar cell, sequentially preparing a diffusion layer, a passivation layer and a silicon nitride layer on one surface of the silicon wafer, and preparing an aluminum back surface field on the surface of the silicon wafer opposite to the diffusion layer, to obtain a solar cell; Step three, prepare the first encapsulation layer, the second encapsulation layer and the third encapsulation layer, use DMSO as solvent and N2 as protective gas, mix acrylic acid, hexafluorobutyl acrylate and epoxy acrylate, add initiator, heat and reflux at 70-80°C for 1-2h to obtain a random copolymer of acrylic acid-epoxy acrylate-hexafluorobutyl acrylate, then add epoxy resin, curing agent and curing accelerator at 110-130°C, stir and mix to obtain a mixed resin, then evacuate at 20-25°C for 3-5min, pour into a mold and combine with glass fiber woven cloth, first evacuate the mold, the vacuum pressure is <0.01MPa, and then program the temperature to heat and press to obtain a packaging composite material, and finally adhere the light transfer film layer in step one to the surface of the packaging composite material; Step 4, welding a plurality of solar cells in step 2 into one piece through a plurality of conductors; Step 5, stacking the upper tempered glass, the first encapsulation layer, the solar cell, the second encapsulation layer, the third encapsulation layer and the lower glass in sequence to obtain a laminate; Step 6: laminating the laminated body in step 5 at 90-130°C for the first time, and then laminating it at 130-150°C for the second time.

Images