Printing carrier plate and photovoltaic cell

Abstract

The utility model discloses a printing carrier plate and a photovoltaic cell, and belongs to the technical field of photovoltaic cells. The printing carrier plate comprises a carrier plate body and a groove array arranged on the surface of at least one side of the carrier plate body, the groove array comprises a plurality of grooves, and gas production layers are arranged in the grooves. According to the utility model, the problem of falling of slurry can be improved, so that the laser printing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell technology, and in particular to a printed 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] Grid lines are conductive structures set on the surface of photovoltaic cells and can be formed using laser printing technology. Laser printing technology uses a high-precision laser to create grooves on a transparent substrate (such as glass) to fill with conductive paste, which is then transferred to the surface of the cell to form grid lines.

[0004] However, when using laser printing technology to print fine grid lines, the ink in the grooves is relatively light and therefore difficult to remove, which affects the efficiency of laser printing. Utility Model Content

[0005] The main purpose of this invention is to propose a printing substrate and photovoltaic cell, which aims to improve the efficiency of laser printing.

[0006] In a first aspect, the present invention provides a printing carrier plate, including a carrier plate body and a groove array disposed on at least one side surface of the carrier plate body, the groove array including a plurality of grooves, and a gas generation layer disposed in the grooves.

[0007] In one embodiment, the gas-generating layer is located at the bottom of the trench.

[0008] In one embodiment, the gas-generating layer includes one of the following: silver nitrate layer, silver chloride layer, nitric acid layer, hypochlorous acid layer, hydrogen peroxide layer, ammonium carbonate layer, and ammonium bicarbonate layer.

[0009] In one embodiment, the gas-generating layer is a liquid layer.

[0010] In one embodiment, the aspect ratio of the trench is less than or equal to 2.

[0011] In one embodiment, the width of the trench is 3μm-20μm.

[0012] In one embodiment, the longitudinal section of the trench includes one of the following: arched, rectangular, trapezoidal, and V-shaped.

[0013] In one embodiment, the carrier plate body is a transparent rigid carrier.

[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 any of the aforementioned printed circuit boards.

[0015] The printing substrate of this invention has a gas-generating layer within its grooves. When the printing substrate is irradiated by a laser, the gas-generating layer generates additional gas under the high-energy laser irradiation, creating a high pressure greater than standard atmospheric pressure within the grooves. The downward thrust generated by this pressure difference helps to push the ink downwards. Therefore, this invention can improve the problem of ink detachment, thereby increasing the efficiency of laser printing. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a top view of a printing carrier plate in one embodiment of the present invention;

[0018] Figure 2 This is a front sectional view of the printing carrier plate in one embodiment of the present invention;

[0019] Figure 3 This is a front sectional view of the printing carrier plate in another embodiment of the present invention.

[0020] Explanation of icon numbers

[0021] 100. Printed substrate; 11. Substrate body; 12. Groove array; 121. Groove; 122. Gas generation layer. 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 only if they are 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 uses a high-precision laser to create grooves on a transparent substrate (such as glass) to fill with conductive paste, which is then transferred to the surface of the solar cell to form grid lines. When using laser printing to prepare fine grid lines, the relatively low weight of the paste within the grooves makes it difficult to detach, thus affecting the efficiency of laser printing.

[0026] The principle of laser printing technology for preparing grid lines is to use a high-energy laser to scan the paste in the groove. The paste expands when heated, generating thrust, which separates it from the groove of the carrier plate and falls onto the solar cell to form grid lines. Therefore, it is possible to increase the thrust in the groove to make the paste easier to detach.

[0027] Based on the above considerations, this utility model provides a printing carrier plate 100, for reference. Figure 1-3 As shown, it includes a carrier plate body 11 and a groove array 12 disposed on at least one side surface of the carrier plate body 11. The groove array 12 includes a plurality of grooves 121, and a gas generation layer 122 is provided in the grooves 121.

[0028] The carrier plate body 11 refers to the carrier used to carry the conductive paste, which is specifically filled in the trench array 13.

[0029] by Figure 1 For example, the groove array 12 is disposed on one side surface of the carrier body 11, that is, the printing carrier 100 is a single-sided printing carrier. In some other embodiments, the groove array 12 may also be disposed on both sides of the carrier body 11, in which case the printing carrier 100 is a double-sided printing carrier.

[0030] The trench array 12 refers to a group of trenches 121 arranged according to certain rules such as row and column order, spacing, and direction. Figure 1 For example, multiple grooves 121 are arranged along the X direction, and each groove 121 extends along the Y direction, with the X and Y directions being perpendicular.

[0031] by Figure 2 and 3For example, a gas-generating layer 122 is provided within the groove 121. The gas-generating layer 122 is a functional layer that can generate gas under laser irradiation. Under high-energy laser irradiation, the gas-generating layer 122 can generate additional gas, creating a high pressure greater than standard atmospheric pressure within the groove 121. The thrust generated by this pressure difference helps push the ink downwards, thereby improving the ink shedding problem and increasing the efficiency of laser printing. Furthermore, the ease with which the ink can be removed from the groove 121 reduces the risk of grid breakage, thus improving the quality of the grid lines.

[0032] According to some embodiments of this application, the gas-producing layer 122 is disposed at the bottom of the trench 121.

[0033] by Figure 3 For example, the gas-generating layer 122 is set at the bottom of the trench 121, so that when the laser is irradiated, the gas-generating layer 122 can generate a downward thrust, which helps to push the slurry out.

[0034] According to some embodiments of this application, the gas-generating layer 122 includes one of the following: silver nitrate layer, silver chloride layer, nitric acid layer, hypochlorous acid layer, hydrogen peroxide layer, ammonium carbonate layer, and ammonium bicarbonate layer.

[0035] Silver nitrate layers decompose under laser irradiation, releasing oxygen and nitrogen dioxide. Its chemical formula is: .

[0036] The silver chloride layer decomposes and releases chlorine gas under laser irradiation. Its chemical formula is: .

[0037] The nitric acid layer decomposes under laser irradiation, releasing oxygen and nitrogen dioxide. Its chemical formula is: .

[0038] The hypochlorous acid layer decomposes and releases oxygen under laser irradiation. Its chemical formula is: .

[0039] Hydrogen peroxide layers decompose and release oxygen under laser irradiation. Its chemical formula is: .

[0040] The ammonium carbonate layer decomposes under laser irradiation, releasing ammonia and carbon dioxide. Its chemical formula is: .

[0041] The ammonium bicarbonate layer decomposes under laser irradiation, releasing ammonia and carbon dioxide. Its chemical formula is: .

[0042] All of the aforementioned gas-generating layers can release gas under laser irradiation, thereby increasing the downward thrust and assisting in the slurry detachment. Among them, when silver nitrate layer and silver chloride layer are used as gas-generating layers, the solid products after their decomposition are only Ag, which will not introduce undesirable substances into the silver paste composition.

[0043] According to some embodiments of the present invention, the gas-generating layer 122 is a liquid layer.

[0044] The gas-generating layer 122 is a liquid layer formed by coating a solution of the gas-generating substance onto the trench 121. The gas-generating substance is dissolved in a solvent to form a solution, facilitating coating. Furthermore, the liquid layer at least partially vaporizes upon laser beam irradiation, generating a localized pressure higher than standard atmospheric pressure in the gap between the slurry and the trench, which aids in slurry removal. In some embodiments, the gas-generating substance can be coated using an aqueous solution, and the coating method can be spraying, brushing, or dipping.

[0045] According to some embodiments of the present invention, the depth-to-width ratio of the groove 121 is less than or equal to 2.

[0046] The depth-to-width ratio refers to the ratio of the depth to the width of the trench 121. A depth-to-width ratio of less than or equal to 2 means that the trench cannot be too deep. For example, the depth-to-width ratio of the trench 121 can be 0.5, 0.8, 1, 1.2, 1.4, 1.6, 1.8, or 2. When the depth-to-width ratio of the trench 121 is less than or equal to 2, the trench 121 is shallower, which helps the slurry to detach.

[0047] According to some embodiments of the present invention, the width of the groove 121 is 3μm-20μm.

[0048] For example, the width of the trench 121 can be 3μm, 5μm, 8μm, 10μm, 12μm, 14μm, 16μm, 18μm, or 20μm. Correspondingly, the maximum depth of the trench 121 is 6μm, 10μm, 16μm, 20μm, 24μm, 28μm, 32μm, 36μm, and 40μm. When the width of the trench 121 is between 3μm and 20μm, grid lines with a width of 3μm to 20μm 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 3μm to 20μm 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.

[0049] According to some embodiments of the present invention, the longitudinal section of the trench 121 includes one of the following: arched, rectangular, trapezoidal, and V-shaped.

[0050] According to some embodiments of the present invention, the carrier plate body 11 is a transparent rigid carrier plate.

[0051] The transparent rigid carrier plate is a high-transmittance laser carrier plate, allowing lasers with wavelengths ranging from 343nm to 2000nm to pass through. In some embodiments, the carrier plate body 11 may include a glass-based transparent plate or a polymer-based transparent plate. The glass-based transparent plate may be quartz glass or ordinary glass, and the polymer-based transparent plate may be a rigid plastic plate or a high-polymerization polymer plate. Using a transparent rigid carrier plate can provide rigidity, achieve good support, and improve the service life of the printing carrier plate 100.

[0052] According to some embodiments of the present invention, a printing substrate 100 is provided, comprising a substrate body 11 and a groove array 12 disposed on one side surface of the substrate body 11. The substrate body 11 is transparent glass. The groove array 12 includes a plurality of grooves 121, the longitudinal section of which is arched. The grooves 121 have a width of 3 μm and a depth of 5 μm. A gas-generating layer 122 is provided at the bottom of the grooves 121. The gas-generating layer 122 is a silver nitrate layer and is a liquid layer.

[0053] 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 fabricated using any of the above-mentioned printed circuit boards.

[0054] 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 printing substrate, characterized in that, The device includes a carrier plate body and a groove array disposed on at least one side surface of the carrier plate body. The groove array includes multiple grooves, and a gas generation layer is provided in the grooves. The depth-to-width ratio of the grooves is less than or equal to 2, and the longitudinal section of the grooves includes one of the following: arch, rectangle, trapezoid, and V-shape.

2. The printing substrate as described in claim 1, characterized in that, The gas-producing layer is located at the bottom of the trench.

3. The printing substrate as described in claim 1 or 2, characterized in that, The gas-producing layer includes one of the following: silver nitrate layer, silver chloride layer, nitric acid layer, hypochlorous acid layer, hydrogen peroxide layer, ammonium carbonate layer, and ammonium bicarbonate layer.

4. The printing substrate as described in claim 3, characterized in that, The gas-producing layer is a liquid layer.

5. The printing substrate as described in claim 1, characterized in that, The width of the groove is 3μm-20μm.

6. The printing substrate as described in claim 1, characterized in that, The carrier plate body is a transparent rigid carrier plate.

7. A photovoltaic cell, characterized in that, It includes a solar cell and grid lines disposed on the surface of the solar cell, the grid lines being manufactured using a printed circuit board as described in any one of claims 1 to 6.

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