Composite film layer printing carrier plate and photovoltaic cell

Abstract

The utility model discloses a composite film layer printing support plate and a photovoltaic cell, and belongs to the technical field of photovoltaic cells. The composite film layer printing carrier plate comprises a carrier plate body and a shading film arranged on the surface of at least one side of the carrier plate body. The carrier plate body is a transparent carrier plate, the shading film is provided with a groove array, and the groove array extends to the carrier plate body in the thickness direction. The composite film layer printing support plate comprises the shading film, so that laser damage to the battery piece can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell technology, and in particular to a composite film layer printing substrate and a photovoltaic cell. Background Technology

[0002] A photovoltaic cell is a semiconductor device that uses the photoelectric effect to convert solar energy into electrical energy. It generates current through photoelectric materials and collects and transmits the current through grid lines.

[0003] Laser-printed grid lines are a novel method for printing metal grid lines. This involves filling micro-grooves in a transparent, rigid substrate with a metal paste, then using a laser to instantly heat the paste at high temperatures. This causes the metal paste to rapidly expand and detach from the micro-grooves, ultimately transferring it from the substrate to the solar cell to form grid lines. Laser printing can improve the linearity of metal grid lines.

[0004] However, when using laser printing to prepare grid lines, the laser spot width is much larger than the trench width. Therefore, the two sides of the laser spot will penetrate the carrier plate and act directly on the solar cell, causing damage to the solar cell. Utility Model Content

[0005] The main purpose of this invention is to propose a composite film layer printing carrier and photovoltaic cell, which aims to reduce the damage to the cell caused by laser printing.

[0006] In a first aspect, the present invention provides a composite film layer printing carrier plate, including a carrier plate body and a light-shielding film disposed on at least one side surface of the carrier plate body; the carrier plate body is a transparent carrier plate, and the light-shielding film is provided with a groove array, which extends to the carrier plate body along the thickness direction.

[0007] In one embodiment, the thickness of the light-shielding film is 0.5 μm-5 μm.

[0008] In one embodiment, the light-shielding film includes at least one of a ceramic film, a diamond-like carbon film, and a metal film.

[0009] In one embodiment, the flatness of the carrier plate body is less than 5 μm.

[0010] In one embodiment, the carrier plate body includes one of a glass-based light-transmitting plate and a polymer-based light-transmitting plate.

[0011] In one embodiment, the trench array includes a plurality of trenches, the width of which is 5μm-20μm.

[0012] In one embodiment, the groove depth is 8μm-20μm.

[0013] In one embodiment, the longitudinal section of the trench includes one of the following: arched, rectangular, trapezoidal, and V-shaped.

[0014] Secondly, this utility model provides a photovoltaic cell, including a cell and grid lines disposed on the surface of the cell, wherein the grid lines are manufactured by printing on any of the aforementioned composite film layers using a substrate.

[0015] The composite film printing substrate of this invention includes a light-shielding film. When irradiated by a laser, the laser can only act on the conductive paste within the trench array. The area outside the trenches is blocked by the light-shielding film, preventing the laser from passing through and thus reducing laser damage caused by laser energy acting on the solar cell. Therefore, this invention can reduce laser damage to solar cells.

[0016] In addition, when the laser irradiates the composite film layer printing substrate, the light-shielding film can absorb the heat at the edge of the laser spot, which can achieve a smaller actual focused spot processing, reduce the width of the groove formed by laser grooving, and effectively improve the smoothness of the inner wall of the groove. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a front sectional view of a composite film layer printing carrier plate in one embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram showing the use of a composite film layer printing carrier plate in one embodiment of the present invention.

[0020] Explanation of icon numbers

[0021] 100. Composite film layer printing carrier; 11. Carrier body; 12. Light-shielding film; 13. Groove array; 131. Groove. Detailed Implementation

[0022] It should be noted that if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the use of "and / or" or "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. In the embodiments of this utility model, "at least one" refers to one or more, and "more" refers to two or more.

[0023] The "range" disclosed in this utility model is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the specific range. The range defined in this way can include or exclude end values, and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range.

[0024] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] Laser printing technology involves using a high-precision laser to create grooves on a transparent substrate to fill with conductive paste, which is then transferred to the surface of the solar cell to form grid lines. Typically, grid lines are printed with a width of 5μm-40μm, and groove widths are 3μm-35μm. The laser spot width used in laser printing needs to be larger than the groove width to reduce the precision requirements of laser processing; therefore, the laser spot size is generally 20μm-500μm. Because the laser spot size is much wider than the groove width, the energy from both sides of the laser spot can penetrate the substrate and directly act on the solar cell, causing laser damage.

[0026] It is advisable to shield the area outside the trench to reduce the laser's penetration through the trench and its impact on the solar cells.

[0027] Based on the above considerations, this utility model provides a composite film layer printing carrier plate 100, for reference. Figure 1 and 2 As shown, it includes a carrier plate body 11 and a light-shielding film 12 disposed on at least one side surface of the carrier plate body 11. The carrier plate body 11 is a transparent carrier plate, and the light-shielding film 12 is provided with a groove array 13. Along the thickness direction, the groove array 13 extends to the carrier plate body 11.

[0028] The light-shielding film 12 refers to a film layer with a transmittance of <1% for lasers with wavelengths of 343nm-2000nm. The light-shielding film 12 can prevent laser transmission, thereby preventing damage to the solar cells from the laser. Figure 2 For example, the light-shielding film 12 is disposed on one side surface of the carrier body 11, and correspondingly, the groove array 13 is disposed on one side of the carrier body 11, that is, the composite film layer printing carrier 100 is a single-sided printing structure. In some other embodiments, the light-shielding film 12 can also be disposed on both sides surface of the carrier body 11. In this case, the groove array 13 is disposed on both sides of the carrier body 11, that is, the composite film layer printing carrier 100 is a double-sided printing structure.

[0029] The light-shielding film 12 can be formed on the carrier plate body 11 by chemical vapor deposition, physical vapor deposition (sputtering, ion plating), thermal spraying, electroplating, etc.

[0030] Further reference Figure 1 As shown, the trench array 13 extending to the carrier plate body 11 means that the depth of the trench array is greater than the thickness of the light-shielding film 12, so that the trench array 13 will penetrate the light-shielding film 12 and extend to the carrier plate body 11.

[0031] When irradiated by a laser, the laser can only act on the conductive paste within the trench array 121. The outer area of ​​the trench is blocked by the light-shielding film 12, preventing the laser from passing through and thus reducing laser damage caused by the laser energy acting on the solar cell. In addition, the light-shielding film 12 can absorb the heat at the edge of the laser spot, enabling smaller actual focused spot processing, reducing the width of the grooves formed by laser etching, and effectively improving the smoothness of the inner wall of the groove.

[0032] According to some embodiments of the present invention, the thickness of the light-shielding film 12 is 0.5μm-5μm.

[0033] For example, the thickness of the light-shielding film 12 can be 0.5μm, 1μm, 1.5μm, 2μm, 2.5μm, 3μm, 3.5μm, 4μm, 4.5μm, or 5μm. When the thickness of the light-shielding film 12 is between 0.5μm and 5μm, the transmission of laser light can be effectively reduced.

[0034] According to some embodiments of the present invention, the light-shielding film 12 includes at least one of a ceramic film, a diamond-like carbon film, and a metal film.

[0035] The light-shielding film 12 includes at least one of ceramic film, diamond-like carbon film, and metal film, meaning that the light-shielding film 12 can be a single-layer film or a multi-layer film composed of the above-mentioned multiple films.

[0036] A ceramic membrane is a membrane layer formed primarily of ceramic materials. In some embodiments, the ceramic membrane includes one of the following: alumina membrane, zirconium oxide membrane, titanium oxide membrane, silicon nitride membrane, aluminum nitride membrane, chromium nitride membrane, silicon carbide membrane, tungsten carbide membrane, and titanium carbide membrane. Ceramic membranes possess high hardness and good chemical stability.

[0037] Diamond-like carbon (DLC) films are amorphous thin films composed of carbon elements, with a structure intermediate between that of diamond (sp...). 3 Hybrid) and graphite (sp) 2 It combines high hardness and low friction coefficient between (hybrids).

[0038] Metallic films are thin films made of metal or alloys, possessing both metallic properties and thin film functions. In some embodiments, metallic films include one of aluminum films, chromium films, copper films, nickel films, and titanium films.

[0039] In some embodiments, the light-shielding film 12 is a double-layer film, comprising one of an alumina-diamond-like carbon (DLC) film, an aluminum nitride-DLC film, or a nitride-carbide film. In the alumina-DLC film, the alumina provides high hardness and good chemical stability, while the diamond-like carbon imparts a low coefficient of friction and excellent toughness. In the nitride-carbide film, the nitride provides high hardness and chemical stability, while the carbide further enhances the film's wear resistance and load-bearing capacity.

[0040] According to some embodiments of the present invention, the carrier plate body 11 includes one of a glass-based light-transmitting plate and a polymer-based light-transmitting plate.

[0041] Glass-based and polymer-based light-transmitting plates are rigid materials that not only provide good support but also have high strength, which can improve the service life of the composite film printing substrate 100.

[0042] In some embodiments, the glass-based light-transmitting plate may be one of quartz glass or ordinary glass, and the polymer-based light-transmitting plate may be one of polymethyl methacrylate light-transmitting plate, polycarbonate light-transmitting plate, polyetheretherketone light-transmitting plate, or polyimide light-transmitting plate.

[0043] According to some embodiments of the present invention, the trench array 13 includes a plurality of trenches 131, the width of which is 5μm-20μm.

[0044] For example, the width of the trench 131 can be 5μm, 6μm, 8μm, 10μm, 12μm, 14μm, 16μm, 18μm, or 20μm. When the width of the trench 131 is between 5μm and 20μm, grid lines of 8μm to 25μm can be formed. On the one hand, this can reduce the amount of conductive silver paste used, thereby reducing the production cost of photovoltaic cells. On the other hand, grid lines with a width of 8μm to 25μm can reduce shading of the solar cells, thereby reducing the impact on the light incident rate of the photovoltaic cells, and thus helping to improve the overall photoelectric conversion efficiency of the photovoltaic cells.

[0045] According to some embodiments of the present invention, the groove depth of the groove 131 is 8μm-20μm.

[0046] For example, the groove depth of the groove 131 can be 8μm, 10μm, 12μm, 14μm, 16μm, 18μm or 20μm.

[0047] According to some embodiments of this utility model, the longitudinal section of the trench includes one of the following: arched, rectangular, trapezoidal, and V-shaped.

[0048] According to some embodiments of this utility model, a composite film layer printing carrier 100 is provided, including a carrier body 11 and a light-shielding film 12 disposed on one side surface of the carrier body 11. The carrier body 11 is transparent glass, and the light-shielding film 12 is an alumina film-diamond-like carbon film composite film with a thickness of 2 μm. The light-shielding film 12 is provided with a groove array 13, which includes a plurality of grooves 131. The longitudinal section of the grooves 131 is arched, with a groove width of 10 μm and a groove depth of 10 μm.

[0049] According to some embodiments of the present invention, the present invention also provides a photovoltaic cell, including a cell and grid lines disposed on the surface of the cell, wherein the grid lines are manufactured by printing on any of the above-mentioned composite film layers.

[0050] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A composite film layer printing carrier plate, characterized in that, It includes a carrier plate body and a light-shielding film disposed on at least one side surface of the carrier plate body; the carrier plate body is a transparent carrier plate, and the light-shielding film has a groove array that extends to the carrier plate body along the thickness direction.

2. The composite film layer printing carrier plate as described in claim 1, characterized in that, The thickness of the light-shielding film is 0.5μm-5μm.

3. The composite film layer printing carrier plate as described in claim 1, characterized in that, The light-shielding film includes at least one of ceramic film, diamond-like carbon film, and metal film.

4. The composite film layer printing substrate as described in any one of claims 1 to 3, characterized in that, The flatness of the carrier plate body is less than 5 μm.

5. The composite film layer printing substrate as described in claim 4, characterized in that, The carrier plate body includes one of glass-based light-transmitting plate and polymer-based light-transmitting plate.

6. The composite film layer printing substrate according to any one of claims 1 to 5, characterized in that, The trench array includes multiple trenches, and the width of the trenches is 5μm-20μm.

7. The composite film layer printing substrate as described in claim 6, characterized in that, The depth of the trench is 8μm-20μm.

8. The composite film layer printing substrate as described in claim 6, characterized in that, The longitudinal section of the trench includes one of the following: arched, rectangular, trapezoidal, and V-shaped.

9. A photovoltaic cell, characterized in that, It includes a battery cell and grid lines disposed on the surface of the battery cell, the grid lines being manufactured using a composite film layer printing substrate as described in any one of claims 1 to 8.

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