A cleaning tank for perovskite crystalline silicon bottom cell

Abstract

The utility model relates to the technical field of solar cell, specifically relates to a kind of cleaning tank for perovskite crystalline silicon bottom cell, including cleaning pool, the cleaning pool middle part is provided with flower basket, the cleaning pool below is provided with drain pipe, the drain pipe is connected with liquid storage tank, one end of the liquid storage tank is connected with circulation pipe, the other end of the circulation pipe is connected with the cleaning pool, and the edge of the cleaning pool is provided with decontamination sandwich in circulation pipe with the circulation pipe connection place edge setting decontamination sandwich, can be handled to the water in circulation pipe by setting decontamination sandwich, pollutant (such as etching agent, additive, metal ion, dust) is recycled after being handled, avoid pollutant stagnation nanometer scale nappe, to avoid the dark color patch in this area when PL detection, guarantee battery performance.

Description

Technical Field

[0001] This utility model relates to the field of solar cell technology, specifically to a cleaning tank for perovskite silicon bottom cells. Background Technology

[0002] The textured surface of monocrystalline silicon forms a pyramidal structure through etching with an alkaline solution. While this micron-level uneven surface increases light absorption, its densely packed micron-level pyramidal structure makes it prone to adsorbing particulate matter and organic residues through its grooves and gaps. Contaminants (such as texturing solutions, additives, metal ions, and dust) easily become embedded in the pyramidal gaps, making them difficult to remove completely with conventional rinsing, thus posing a cleaning challenge. This is especially true for perovskite / silicon tandem solar cells, where even smaller textured surfaces are required, with texture sizes transitioning from micron to nanometer scales. The purpose is to ensure that nanotextured surfaces have better wettability with perovskite solutions, achieving conformal coverage and avoiding film breakage or porosity issues caused by large pyramidal structures. Simultaneously, the confinement effect at the nanoscale can induce vertical growth of perovskite grains, improving crystal quality. Furthermore, nanostructures can promote carrier separation and collection, and nanotextured surfaces help release residual stress in the perovskite film, improving the stability of perovskite tandem solar cell devices.

[0003] While nanoscale textured surfaces offer excellent performance as a substrate for perovskite stacked cells, they can also lead to deep contaminant retention. In subsequent PECVD processes, these retained contaminant areas can form localized high-resistivity regions or micro-short-circuit channels. During photopolymerization (PL) testing, carrier recombination in these areas intensifies, resulting in dark patches and a blackening phenomenon. This ultimately degrades the performance of the finished stacked cell. The main reasons for this are twofold: firstly, the nanoscale textured surface consists of dense submicron-sized grooves or pores (typically <300nm in size), reaching depths in the micrometer range, creating an ultra-high aspect ratio structure. Once external contaminants (such as metal particles or organic matter) enter the bottom of the grooves, conventional water flow shear forces cannot remove them. Secondly, the nanoscale pores generate strong capillary forces, actively adsorbing impurity particles in the liquid, making contaminants more easily embedded within the structure rather than remaining on the surface.

[0004] Currently, to address the issue of contaminant residue or incomplete cleaning on nanoscale textured surfaces, methods such as adjusting bubbling parameters to enhance solution permeability, increasing water flow to improve hydrophobicity, optimizing slow lifting speed to reduce liquid film residue, high-frequency ultrasonic cleaning, and low-surface-tension solvent cleaning are employed. While these methods are effective for micron-scale textured surfaces, they are less effective for nanoscale textured surfaces. Therefore, it is necessary to research new technologies and devices to systematically solve the problems of contaminant residue and deep retention during the growth of nanoscale textured surfaces. Utility Model Content

[0005] The purpose of this invention is to provide a cleaning tank for perovskite silicon bottom solar cells, which solves the technical problem that in the prior art, nanoscale textured surfaces cause deep contaminant retention, and after subsequent PECVD processes, the areas where contaminants are deeply retained will form local high resistance regions or micro-short circuit channels. During PL testing, carrier recombination in these areas will intensify, resulting in dark patches that appear black, which will degrade the performance of the tandem solar cells after they are made into finished cells.

[0006] This utility model discloses a cleaning tank for perovskite silicon bottom solar cells, including a cleaning pool, a flower basket in the middle of the cleaning pool, a drain pipe below the cleaning pool, a liquid storage tank connected to the drain pipe, a circulation pipe connected to one end of the liquid storage tank, the other end of the circulation pipe connected to the cleaning pool, a decontamination interlayer provided at the edge of the cleaning pool connected to the circulation pipe, the decontamination interlayer including ion exchange resin and a separator plate for isolating the ion exchange resin, the separator plate being provided with mesh holes.

[0007] Working principle: During use, the silicon wafer is placed in a cleaning basket for cleaning. After cleaning, the water is drained from the cleaning tank through the drain pipe and stored in the storage tank. When needed, the water is returned to the cleaning tank through the circulation pipe for cleaning. By setting up a decontamination interlayer, the water in the circulation pipe can be treated. Contaminants (such as texturing solution, additives, metal ions, and dust) are treated before being recycled, preventing contaminants from remaining on the nanoscale textured surface. This avoids dark patches appearing in this area during PL testing, ensuring battery performance.

[0008] By setting up ion exchange resin, dirt on the silicon wafer and the solution are simultaneously adsorbed by the ion exchange resin, preventing secondary diffusion of pollutants into the tank and adhering to the silicon wafer, thus keeping the solution in the cleaning tank clean.

[0009] By setting up isolation plates and mesh holes, the ion exchange resin can be confined while ensuring the cleaning effect.

[0010] Furthermore, the sidewalls of the cleaning pool are all provided with a decontamination interlayer.

[0011] By setting a decontamination interlayer on the side wall of the cleaning tank, the effective range of the decontamination interlayer can be expanded, thereby improving the decontamination effect.

[0012] Furthermore, the bottom surface of the cleaning tank is provided with a decontamination interlayer.

[0013] By setting a decontamination interlayer at the bottom of the cleaning tank, the effective range of the decontamination interlayer can be expanded, thereby improving the decontamination effect.

[0014] Furthermore, a desiccant is provided inside the cleaning pool.

[0015] By incorporating a cleaning cartridge, dirt can be further removed beyond the cleaning interlayer, ensuring effective cleaning.

[0016] Furthermore, there are at least two cleaning cylinders.

[0017] Furthermore, the number of the cleaning cylinders is four.

[0018] Furthermore, the cleaning cylinder is filled with ion exchange resin.

[0019] Furthermore, a drive device for driving the cleaning cylinder to rotate is connected to the lower part of the cleaning cylinder.

[0020] By setting up a drive device, the cleaning cylinder can be rotated, thereby improving the cleaning effect of the cleaning cylinder.

[0021] Furthermore, the cleaning cylinder and the driving device are detachably connected.

[0022] Furthermore, the cleaning cylinder and the driving device are detachably connected by threads.

[0023] Furthermore, the driving device is a motor.

[0024] Furthermore, the circulation pipe is connected to a circulation pump.

[0025] By installing a circulation pump, water in the storage tank can be driven into the cleaning tank through the circulation pipe, thus realizing the recycling of water.

[0026] Furthermore, a filter element is installed inside the circulation pipe.

[0027] By installing a filter element, the water can be treated before entering the decontamination chamber, reducing the working pressure of the decontamination chamber.

[0028] Compared with the prior art, the beneficial effects of this utility model are: By incorporating a decontamination interlayer, the water in the circulation pipe can be treated. Contaminants (such as texturing solutions, additives, metal ions, and dust) are treated before recycling, preventing contaminants from remaining on the nanoscale texturing surface and thus avoiding dark patches in that area during PL testing, ensuring battery performance. Similarly, incorporating a decontamination interlayer on the sidewall of the cleaning tank expands its effective range and improves the decontamination effect. Furthermore, incorporating a decontamination interlayer on the bottom of the cleaning tank further expands its effective range and improves the decontamination effect. Finally, the use of ion exchange resin allows for the simultaneous adsorption of contaminants from both the silicon wafer and the solution, preventing contaminants from being trapped on the surface. Secondary diffusion adheres to the silicon wafer within the tank, maintaining the cleanliness of the solution. The use of isolation plates and mesh pores limits the ion exchange resin while ensuring effective cleaning. A decontamination cartridge further removes contaminants beyond the decontamination layer, guaranteeing optimal cleaning. A drive mechanism rotates the decontamination cartridge, enhancing its cleaning efficiency. A circulation pump draws water from the storage tank into the cleaning tank via a circulation pipe, enabling water recycling. A filter element treats the water before it enters the decontamination layer, reducing its operating pressure. Attached Figure Description To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the cleaning tank structure of this utility model.

[0030] Figure 2 This is a top view of the cleaning tank structure of this utility model.

[0031] In the above attached figures, the meanings of each mark are as follows: 1-washing tank, 2-flower basket, 3-drain pipe, 4-filter element, 5-storage tank, 6-circulation pipe, 7-decontamination jacket, 8-ion exchange resin, 9-isolation plate, 10-mesh hole, 11-decontamination cylinder, 12-motor, 13-circulation pump. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments.

[0033] Example 1 The technical solution adopted in this embodiment is as follows: like Figures 1-2 As shown, a cleaning tank for perovskite silicon bottom solar cells includes a cleaning pool 1, a basket 2 in the middle of the cleaning pool 1, a drain pipe 3 below the cleaning pool 1, a liquid storage tank 5 connected to the drain pipe 3, a circulation pipe 6 connected to one end of the liquid storage tank 5, and the other end of the circulation pipe 6 connected to the cleaning pool 1. A decontamination interlayer 7 is provided at the edge of the cleaning pool 1 connected to the circulation pipe 6. The decontamination interlayer 7 includes an ion exchange resin 8 and a separator plate 9 for isolating the ion exchange resin 8. The separator plate 9 is provided with mesh holes 10.

[0034] Working principle: During use, the silicon wafer is placed in the cleaning basket 2 for cleaning. After cleaning, the water is discharged from the cleaning tank 1 through the drain pipe 3 and stored in the storage tank 5. When needed, the water is returned to the cleaning tank 1 through the circulation pipe 6 for cleaning. By setting up a decontamination interlayer 7, the water in the circulation pipe 6 can be treated. Contaminants (such as texturing solution, additives, metal ions, and dust) are treated before being recycled, avoiding contaminants remaining on the nanoscale texturing surface. This prevents dark patches from appearing in this area during PL testing and ensures battery performance.

[0035] By setting up ion exchange resin 8, dirt on the silicon wafer and dirt in the solution are simultaneously adsorbed in ion exchange resin 8, preventing secondary diffusion of pollutants into the tank and adhering to the silicon wafer, thus keeping the solution in the cleaning tank clean.

[0036] By setting the isolation plate 9 and the mesh holes 10, the ion exchange resin 8 can be confined while ensuring the cleaning effect.

[0037] Example 2 This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figures 1-2 As shown, based on Embodiment 1, the following improvement is disclosed: the sidewalls of the cleaning pool 1 are all provided with a decontamination interlayer 7.

[0038] By setting a decontamination interlayer 7 on the side wall of the cleaning tank 1, the effective range of the decontamination interlayer 7 can be expanded, and the decontamination effect can be improved.

[0039] In some embodiments, the bottom surface of the cleaning tank 1 is provided with a decontamination interlayer 7.

[0040] By setting a decontamination interlayer 7 on the bottom surface of the cleaning tank 1, the effective range of the decontamination interlayer 7 can be expanded, and the decontamination effect can be improved.

[0041] Example 3 This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figures 1-2As shown, based on embodiment 2, the following improvement is disclosed: the cleaning tank 1 is provided with a decontamination cylinder 11, the number of the decontamination cylinder 11 is 4, the decontamination cylinder 11 is filled with ion exchange resin 8, and the lower part of the decontamination cylinder 11 is connected to a driving device for driving the decontamination cylinder 11 to rotate, the driving device being a motor 12.

[0042] By setting up the cleaning cylinder 11, dirt can be further removed on the basis of the cleaning interlayer 7, ensuring the cleaning effect.

[0043] By setting a drive device, the cleaning cylinder 11 can be driven to rotate, thereby improving the cleaning effect of the cleaning cylinder 11.

[0044] Example 4 This embodiment is a preferred embodiment of the present utility model. Based on embodiment 3, it discloses the following improvement: the cleaning cylinder 11 and the motor 12 are detachably connected by threads.

[0045] Example 5 This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figures 1-2 As shown, based on embodiment 4, the following improvement is disclosed: the circulation pipe 6 is connected to the circulation pump 13, and the circulation pipe 6 is provided with a filter element 4.

[0046] By setting up a circulation pump 13, water in the storage tank 5 can be driven into the cleaning tank through the circulation pipe 6, thus realizing the recycling of water.

[0047] By setting filter element 4, the water can be treated before entering the decontamination jacket 7, reducing the working pressure of the decontamination jacket 7.

[0048] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments based on the inspiration of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be determined by the claims, and the specification can be used to interpret the claims.

Claims

1. A cleaning tank for perovskite silicon bottom solar cells, characterized in that: The system includes a cleaning tank (1), a flower basket (2) in the middle of the cleaning tank (1), a drain pipe (3) below the cleaning tank (1), a liquid storage tank (5) connected to the drain pipe (3), a circulation pipe (6) connected to one end of the liquid storage tank (5), the other end of the circulation pipe (6) connected to the cleaning tank (1), a decontamination interlayer (7) at the edge of the cleaning tank (1) connected to the circulation pipe (6), the decontamination interlayer (7) including ion exchange resin (8) and a separation plate (9) for isolating the ion exchange resin (8), and a mesh hole (10) provided on the separation plate (9).

2. The cleaning tank for perovskite silicon bottom solar cells according to claim 1, characterized in that: The cleaning tank (1) is provided with a decontamination interlayer (7) on its side wall.

3. A cleaning tank for perovskite silicon bottom solar cells according to claim 2, characterized in that: The bottom surface of the cleaning tank (1) is provided with a decontamination interlayer (7).

4. A cleaning tank for perovskite silicon bottom solar cells according to any one of claims 1-3, characterized in that: The cleaning tank (1) is equipped with a descaling cylinder (11).

5. A cleaning tank for perovskite silicon bottom solar cells according to claim 4, characterized in that: The cleaning cylinder (11) is filled with ion exchange resin (8).

6. A cleaning tank for perovskite silicon bottom solar cells according to claim 4, characterized in that: There are at least two cleaning cylinders (11).

7. A cleaning tank for perovskite silicon bottom solar cells according to claim 4, characterized in that: The lower part of the cleaning cylinder (11) is connected to a drive device that drives the cleaning cylinder (11) to rotate.

8. A cleaning tank for perovskite silicon bottom solar cells according to claim 7, characterized in that: The cleaning cylinder (11) is detachably connected to the driving device.

9. A cleaning tank for perovskite silicon bottom solar cells according to claim 1, characterized in that: The circulation pipe (6) is connected to a circulation pump (13).

10. A cleaning tank for perovskite silicon bottom solar cells according to claim 1, characterized in that: A filter element (4) is installed inside the circulation pipe (6).

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