Laminated assembly and solar cell

Abstract

The utility model discloses a lamination assembly and a solar cell, the lamination assembly comprises a back glass, a back adhesive film, a crystalline silicon cell, a front adhesive film and a perovskite cell, the back glass, the back adhesive film, the crystalline silicon cell, the front adhesive film and the perovskite cell are sequentially laminated from bottom to top, the crystalline silicon cell is a multi-slice structure, and the front adhesive film is a multi-slice structure. The back adhesive film is a POE adhesive film, and the front adhesive film is a selective adhesive film which is used for reflecting light entering from the back so as to enable the light to be absorbed by the crystalline silicon cell again. According to the utility model, the problem of low efficiency of the back surface of the laminated assembly can be effectively solved.

Description

Technical Field

[0001] This utility model relates to the technical field of photovoltaic cells, and in particular to a tandem module and a solar cell. Background Technology

[0002] A tandem module is a structure that stacks two or more solar cells made of different materials together. By utilizing the different absorption characteristics of the solar spectrum of different materials, the overall photoelectric conversion efficiency is improved. Common tandem modules include perovskite / crystalline silicon tandem modules and perovskite / perovskite tandem modules.

[0003] Currently, perovskite / crystalline silicon tandem solar cells are mainly divided into two structures: two-terminal tandem and four-terminal tandem. Four-terminal tandem cells, where crystalline silicon and perovskite are fabricated separately and laminated together at the module end, are easier to implement. However, current tandem modules only focus on the efficiency of the front side, neglecting the efficiency of the back side, thus failing to fully utilize the advantages of both perovskite and crystalline silicon cells. Because perovskite cells have weak absorption capacity for long-wavelength light (such as infrared light), when long-wavelength light enters the tandem cell from the back side, the perovskite cells cannot effectively absorb this light, resulting in the energy of this light not being fully utilized, thereby reducing the overall efficiency of the tandem module. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a stacked component that can effectively solve the problem of low efficiency on the back side of the stacked component.

[0005] Another objective of this invention is to provide a solar cell.

[0006] The objective of this utility model can be achieved by adopting the following technical solutions:

[0007] A stacked assembly includes a back glass, a back film, a crystalline silicon cell, a front film, and a perovskite cell. The back glass, back film, crystalline silicon cell, front film, and perovskite cell are stacked sequentially from bottom to top. The crystalline silicon cell has a multi-segment structure. The back film is a POE film. The front film is a selective film used to reflect light entering from the back side so that it can be reabsorbed by the crystalline silicon cell.

[0008] Furthermore, the selective adhesive film is a composite adhesive film.

[0009] Furthermore, the composite film is composed of multiple layers of materials with different refractive indices.

[0010] Furthermore, the aspect ratio of each segment of the crystalline silicon cell is ≥3, and the edges of adjacent segments are overlapped to form a negative spacing.

[0011] Furthermore, it also includes a junction box, wherein the crystalline silicon cell and the perovskite cell are connected in parallel and then electrically connected to the junction box.

[0012] Another objective of this utility model can be achieved by adopting the following technical solution:

[0013] A solar cell includes the aforementioned stacked assembly.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0015] This invention, through the selective film setting, can reflect back long-wavelength light that is not absorbed in time on the back side and reabsorb it by the crystalline silicon cell, thereby improving the light utilization rate and thus improving the overall photoelectric conversion efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the stacked component of this utility model.

[0017] Figure 2 This is a front view of the stacked component of this utility model. Detailed Implementation

[0018] 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 some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0019] Example 1:

[0020] like Figure 1 , Figure 2 As shown, this embodiment provides a stacked assembly, including a back glass 1, a back film 2, a crystalline silicon cell 3, a front film 4, and a perovskite cell 5. The back glass 1, the back film 2, the crystalline silicon cell 3, the front film 4, and the perovskite cell 5 are stacked sequentially from bottom to top. The crystalline silicon cell has a multi-segment structure, the back film 2 is a POE film, and the front film 4 is a selective film used to reflect light entering from the back so that it can be reabsorbed by the crystalline silicon cell 3. Specifically, it is a composite film composed of multiple layers of materials with different refractive indices.

[0021] Existing connecting materials between the two cells of a tandem module only serve to allow light to pass through the front side, failing to account for the fact that long-wavelength light entering from the back cannot be absorbed by the perovskite cell. This application, through the use of a selective adhesive film, allows light energy passing through the perovskite cell on the front side of the tandem module to smoothly enter the crystalline silicon cell. Meanwhile, light passing through the crystalline silicon cell on the back side of the tandem module is reflected by the selective adhesive film, preventing it from entering the perovskite cell. In this way, long-wavelength light energy is absorbed again by the crystalline silicon cell without being lost through the perovskite cell, effectively improving light absorption on the back side.

[0022] Each segment of the crystalline silicon cell has an aspect ratio of ≥3. In this embodiment, the size is 182*45.5mm. The edges of adjacent segments are overlapped to form a negative spacing, which improves the efficiency of the crystalline silicon cell. The crystalline silicon cell can generate a larger current. The high on-state voltage of the perovskite cell and the improved current output of the crystalline silicon cell can be better matched, thereby improving the power output of the entire stacked module.

[0023] It also includes junction box 6, where the crystalline silicon cell and the perovskite cell are connected in parallel and then electrically connected to the junction box.

[0024] Example 2:

[0025] This embodiment provides a solar cell, including the stacked assembly described in Embodiment 1.

[0026] The above description is only a preferred embodiment of this utility model patent, but the protection scope of this utility model patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this utility model patent, based on the technical solution and utility model patent concept of this utility model patent, shall fall within the protection scope of this utility model patent.

Claims

1. A stacked assembly, characterized in that: The device includes a back glass, a back adhesive film, a crystalline silicon cell, a front adhesive film, and a perovskite cell. The back glass, back adhesive film, crystalline silicon cell, front adhesive film, and perovskite cell are stacked sequentially from bottom to top. The crystalline silicon cell has a multi-segment structure, the back adhesive film is a POE adhesive film, and the front adhesive film is a selective adhesive film used to reflect light entering from the back so that it can be reabsorbed by the crystalline silicon cell.

2. The stacked assembly according to claim 1, characterized in that: The selective adhesive film is a composite adhesive film.

3. The stacked assembly according to claim 2, characterized in that: The composite film is composed of multiple layers of materials with different refractive indices.

4. The stacked assembly according to claim 1, characterized in that: The aspect ratio of each segment of the crystalline silicon cell is ≥3, and the edges of adjacent segments are overlapped to form a negative spacing.

5. The stacked assembly according to claim 1, characterized in that: It also includes a junction box, and the crystalline silicon cell and the perovskite cell are connected in parallel and then electrically connected to the junction box.

6. A solar cell, characterized in that, Includes the stacked assembly described in any one of claims 1 to 5.

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