Perovskite photovoltaic flexible stack assembly for pet substrate

Abstract

The utility model relates to photovoltaic technical field discloses a kind of perovskite photovoltaic flexible laminated assembly for PET substrate, the component includes photovoltaic laminated main body and the protective component of its outer periphery;Protective component includes an edge sealing frame, its inner wall is equipped with multiple card slots arranged in ladder along thickness direction, four corners of edge sealing frame are also fixed with buffer air bag;The edge of each layer of photovoltaic laminated main body is fixed in corresponding card slot in the way of clamping, and form ladder type sealing structure;The structure is effectively prevented by the physical locking of ladder type card slot Layer sliding and warping, and water oxygen is blocked with zigzag path, simultaneously, in combination with the energy-absorbing effect of four-corner air bag buffering, the problem of low mechanical strength and poor sealing of flexible component is solved, the bending resistance, impact resistance and environmental stability of component are significantly enhanced, and the service life of device is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a flexible multilayer perovskite photovoltaic module for PET substrate. Background Technology

[0002] Perovskite solar cells have become one of the most promising technologies in the photovoltaic field due to their excellent photoelectric conversion efficiency, tunable bandgap, and low-cost fabrication process. To further broaden their applications, such as in portable electronic devices, wearable devices, and building-integrated photovoltaics, researchers are dedicated to developing flexible perovskite solar cells based on flexible substrates such as PET.

[0003] However, shifting rigid devices to flexible ones presents new technical challenges. First, flexible devices inevitably experience bending, folding, and even accidental impacts in practical use. Perovskite materials themselves are brittle, and under repeated mechanical stress, multilayered functional films are prone to stress concentration between layers, leading to microcracks, relative sliding of functional layers, or even delamination. This directly damages the physical integrity and electrical performance of the device.

[0004] Even more serious is the fact that perovskite materials are extremely sensitive to moisture and oxygen in the environment. Once exposed, they degrade rapidly, leading to a sharp decline in device performance or even permanent failure. Traditional encapsulation technologies, such as glass encapsulation, while providing good sealing, cannot meet the requirements of flexibility. Thin-film encapsulation technologies used for flexible devices typically have limited water and oxygen barrier capabilities, especially in the edge regions of the device, which are often the shortest paths and weakest points for moisture and oxygen penetration. Existing simple encapsulation edge sealing methods are insufficient to provide long-term effective protection.

[0005] Therefore, existing flexible perovskite photovoltaic modules generally face the dual challenges of poor mechanical and environmental stability: on the one hand, the lack of effective structural design to resist mechanical stress makes the physical structure susceptible to damage; on the other hand, insufficient edge sealing fails to provide long-term reliable protection for the sensitive internal perovskite material. These shortcomings severely restrict the actual service life and commercialization of flexible perovskite photovoltaic modules. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a flexible perovskite photovoltaic stacked module for PET substrates. It aims to improve the problems of low mechanical strength and poor impact resistance caused by insufficient structural design in flexible perovskite photovoltaic stacked modules for PET substrates, as well as insufficient edge sealing and inability to effectively prevent water and oxygen intrusion, which lead to easy device damage, poor stability and short service life. This utility model aims to provide a perovskite photovoltaic flexible stacked module for PET substrates with an improved structure that can effectively solve the above problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a perovskite photovoltaic flexible stacked module for PET substrate, comprising: a photovoltaic stacked body composed of a PET substrate, a photovoltaic functional stack disposed on the PET substrate, and an encapsulation layer covering the photovoltaic functional stack; and a protective component for protecting the photovoltaic stacked body.

[0008] The protective component includes an edge-sealing frame that surrounds the main body of the photovoltaic stack, consisting of a horizontal edge-sealing layer and a vertical edge-sealing layer, and airbags located at the four corners of the edge-sealing frame.

[0009] Furthermore, the inner wall of the sealing frame is provided with multiple slots arranged in a stepped manner along the thickness direction of the photovoltaic stack body, and the edges of each corresponding layer of the photovoltaic stack body are respectively fixed in the corresponding slots by snap-fit.

[0010] Preferably, the photovoltaic functional stack includes a perovskite light-absorbing layer for the bottom cell, an intermediate connecting layer, an electron transport layer, and a perovskite light-absorbing layer for the top cell, which are sequentially disposed between the PET substrate and the encapsulation layer.

[0011] Preferably, the horizontal edge sealing layer and the vertical edge sealing layer are perpendicularly connected to each other, forming a rectangular edge sealing frame together.

[0012] In one specific implementation, the transverse edge sealing layer and the longitudinal edge sealing layer are integrally formed.

[0013] Preferably, the plurality of slots are grooves of different depths and positions formed along the thickness direction on the inner wall of the edge sealing frame.

[0014] Furthermore, the thickness of the edge of each corresponding layer of the photovoltaic stack is adapted to the opening width of the slot, and the two are in a close fit.

[0015] Preferably, the airbag is disposed on the outside of the junction of the adjacent transverse sealing layer and the longitudinal sealing layer.

[0016] In one specific implementation, the airbag is integrally formed with the transverse sealing layer and the longitudinal sealing layer.

[0017] Preferably, the airbag is a rectangular block-shaped hollow structure.

[0018] This utility model has the following beneficial effects: In this invention, by setting up an edge-sealing frame and creating stepped slots on its inner wall that adapt to the edges of each functional layer, physical locking and stepped sealing of the edges of each layer are achieved. On the one hand, this effectively prevents relative sliding, warping, and delamination between layers when the flexible component is bent or subjected to force, significantly enhancing the stability of the overall structure and its resistance to bending fatigue. On the other hand, this structure forms a tortuous and lengthy path for water vapor and oxygen permeation, greatly improving the edge sealing performance of the component and effectively blocking the intrusion of harmful external substances.

[0019] In this invention, airbags are provided at the four vulnerable corners of the component. When the component is subjected to mechanical impacts such as drops or collisions, or is subjected to excessive bending stress, the airbags can play an effective buffering and protective role, absorb and disperse stress, and prevent the internal brittle perovskite functional layer from cracking or being damaged due to stress concentration, thereby improving the impact resistance and mechanical durability of the component. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a perovskite photovoltaic flexible stacked module for PET substrate proposed in this utility model. Figure 2 This is a schematic diagram of the encapsulation layer structure of a perovskite photovoltaic flexible stacked module for PET substrate proposed in this utility model. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the lateral sealing layer structure of a perovskite photovoltaic flexible stacked module for PET substrate proposed in this utility model.

[0021] Legend: 1. Protective components; 101. Airbag; 102. Lateral sealing layer; 103. Longitudinal sealing layer; 4. Encapsulation layer; 5. Perovskite light-absorbing layer of the top cell; 6. Electron transport layer; 7. Intermediate connecting layer; 8. Perovskite light-absorbing layer of the bottom cell; 9. PET substrate; 104. Card slot. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please refer to Figures 1 to 4 This utility model provides a flexible perovskite photovoltaic module for PET substrates, which aims to solve the problems of insufficient mechanical strength and poor sealing performance of existing flexible perovskite photovoltaic modules, resulting in short device stability and service life.

[0024] like Figure 1 and Figure 2 As shown, the perovskite photovoltaic flexible stacked module for PET substrate includes a photovoltaic stacked body and a protective component 1. The photovoltaic stacked body is composed of a PET substrate 9 as a support layer, a perovskite light-absorbing layer 8 of the bottom cell, an intermediate connecting layer 7, an electron transport layer 6 and a perovskite light-absorbing layer 5 of the top cell, which are sequentially stacked and fixed on the PET substrate 9, and an encapsulation layer 4 covering the top of the perovskite light-absorbing layer 5 of the top cell. The protective component 1 is disposed on the outer periphery of the photovoltaic stacked body.

[0025] Please refer to Figure 1 , Figure 3 and Figure 4 The protective component 1 includes an edge-sealing frame formed by a transverse edge-sealing layer 102 and a longitudinal edge-sealing layer 103, which surrounds and is fixed to the outer periphery of the photovoltaic stack body. Please refer to the following for details. Figure 3 and Figure 4 Multiple slots 104 are provided on the inner wall of the edge sealing frame, and the multiple slots 104 are along the thickness direction of the photovoltaic stack body, that is... Figure 3 The layers are arranged in a stepped manner along the top and bottom, forming a multi-level sealing and blocking path. The edges of the PET substrate 9, the perovskite light-absorbing layer 8 of the bottom cell, the intermediate connecting layer 7, the electron transport layer 6, the perovskite light-absorbing layer 5 of the top cell, and the encapsulation layer 4 in the photovoltaic stack are respectively inserted and fixed into their corresponding slots 104, thereby achieving stepped sealing and physical locking of the edges of each layer, preventing relative sliding and lifting between layers. Figure 1 and Figure 4 As shown, airbags 101 are fixedly connected to the four corners of the protective component 1. The airbags 101 are set at the connection between the adjacent transverse sealing layer 102 and the longitudinal sealing layer 103, and are used to absorb and disperse stress when the component is subjected to external impact or bending stress, so as to play a buffering and protective role.

[0026] The horizontal edge sealing layer 102 and the vertical edge sealing layer 103 are perpendicularly and fixedly connected to each other to form a rectangular edge sealing frame. The connection between the horizontal edge sealing layer 102 and the vertical edge sealing layer 103 can be an integral molding structure to ensure the overall structural strength and sealing integrity of the edge sealing frame. Alternatively, the two can be connected by splicing and fixing structure.

[0027] For details, please refer to Figure 3 Multiple slots 104 are grooves of different depths and positions opened along the thickness direction on the inner wall of the edge sealing frame. Their positions and distribution in the stacking direction match the thickness and stacking order of the inserted PET substrate 9, the perovskite light-absorbing layer 8 of the bottom cell, the intermediate connecting layer 7, the electron transport layer 6, the perovskite light-absorbing layer 5 of the top cell, and the encapsulation layer 4. The edges of each corresponding layer of the photovoltaic stack body are in a close fit with the inner wall of the slot 104 to ensure the firmness of the fixation and the reliability of the seal.

[0028] For details, please refer to Figure 1 and Figure 4 The airbag 101 is specifically disposed on the outside of the connection between adjacent transverse sealing layer 102 and longitudinal sealing layer 103. Preferably, the airbag 101 is integrally formed with the transverse sealing layer 102 and the longitudinal sealing layer 103. The airbag 101 has a rectangular block-shaped hollow structure. This structure allows it to undergo elastic deformation when subjected to pressure, thereby effectively absorbing and dispersing impact energy. Working principle: In operation, the perovskite photovoltaic flexible tandem module using a PET substrate uses the PET substrate 9 as the overall flexible support layer, supporting the perovskite light-absorbing layer 8 of the bottom cell, the intermediate connecting layer 7, the electron transport layer 6, the perovskite light-absorbing layer 5 of the top cell, and the outermost encapsulation layer 4, which are fixedly connected sequentially on it. To improve the overall structural stability and sealing performance, the edge-sealing frame formed by the horizontal edge-sealing layer 102 and the vertical edge-sealing layer 103 around the outer wall of the photovoltaic tandem main body uses multiple stepped slots 104 opened in its inner wall to insert and lock the edges of the corresponding layers in the photovoltaic tandem main body one by one. This stepped sealing structure effectively prevents relative sliding and warping between the layers due to force or environmental influences through physical locking. This layering not only creates a layered structure but also forms a tortuous and lengthy multi-level sealing barrier path, greatly increasing the difficulty for moisture and oxygen to penetrate the internal core functional layer. At the same time, when the component is subjected to external impact or excessive bending stress during transportation or use, the airbags 101, which are fixed at the four vulnerable corners of the protective component 1 and serve as a buffer structure, can absorb and disperse stress through their own elastic deformation, playing a buffering and protective role. This prevents damage to the internally rigid stacked structure, especially the perovskite light-absorbing layer. This design, together with the overall coverage of the encapsulation layer 4 and the physical fixation of the edge sealing frame, allows the entire component to maintain flexibility while significantly enhancing its mechanical strength and environmental sealing performance, thereby effectively extending the operational stability and service life of the device.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flexible multilayer perovskite photovoltaic module for a PET substrate, comprising: A photovoltaic stack body consisting of a PET substrate (9), a photovoltaic functional stack disposed on the PET substrate (9), and an encapsulation layer (4) covering the photovoltaic functional stack; and The protective component (1) used to protect the main body of the photovoltaic stack is characterized in that, The protective component (1) includes an edge sealing frame that surrounds the outer periphery of the photovoltaic stack body, consisting of a transverse edge sealing layer (102) and a longitudinal edge sealing layer (103); The inner wall of the sealing frame is provided with multiple slots (104), which are arranged in a stepped manner along the thickness direction of the photovoltaic stack body, and the edges of each corresponding layer of the photovoltaic stack body are respectively snapped and fixed in the corresponding slots (104); and Airbags (101) are provided at each of the four corners of the protective component (1).

2. The perovskite photovoltaic flexible multilayer module for PET substrate according to claim 1, characterized in that, The photovoltaic functional stack includes a perovskite light-absorbing layer (8), an intermediate connecting layer (7), an electron transport layer (6), and a perovskite light-absorbing layer (5) of the bottom cell, which are sequentially disposed between the PET substrate (9) and the encapsulation layer (4).

3. The perovskite photovoltaic flexible multilayer module for PET substrate according to claim 1, characterized in that, The horizontal edge sealing layer (102) and the vertical edge sealing layer (103) are perpendicularly connected to each other, forming a rectangular edge sealing frame together.

4. A perovskite photovoltaic flexible multilayer module for a PET substrate according to claim 3, characterized in that, The horizontal edge sealing layer (102) and the vertical edge sealing layer (103) are integrally formed.

5. A perovskite photovoltaic flexible multilayer module for a PET substrate according to claim 1, characterized in that, The plurality of slots (104) are grooves of different depths and positions that are opened along the thickness direction on the inner wall of the edge sealing frame.

6. A flexible perovskite photovoltaic multilayer module for a PET substrate according to claim 1 or 5, characterized in that, The edges of each corresponding layer of the photovoltaic stack body are in a close fit with the inner wall of the slot (104).

7. A perovskite photovoltaic flexible multilayer module for a PET substrate according to claim 1, characterized in that, The airbag (101) is located on the outside of the connection between the adjacent transverse sealing layer (102) and the longitudinal sealing layer (103).

8. A flexible multilayer perovskite photovoltaic module for a PET substrate according to claim 7, characterized in that, The airbag (101) is integrally formed with the transverse sealing layer (102) and the longitudinal sealing layer (103).

9. A perovskite photovoltaic flexible multilayer module for a PET substrate according to claim 1, characterized in that, The airbag (101) is a rectangular block-shaped hollow structure.

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