Novel flexible photovoltaic packaging structure

Abstract

The utility model relates to the field of photovoltaic packaging, in particular to a novel flexible photovoltaic packaging structure, which comprises a photovoltaic cell, the photovoltaic cell comprises a hole transport layer, a photovoltaic material layer and an electron transport layer, flexible barrier films are attached to the upper end and the lower end of the photovoltaic cell, and each flexible barrier film comprises a transparent conductive layer and a barrier layer. The transparent conducting layer comprises a buffer layer, the blocking layer comprises a blocking layer base material, the transparent conducting layer is located on the top surface of the photovoltaic cell, and the blocking layer is located on the top surface of the transparent conducting layer; according to the utility model, the flexible barrier film is used to replace the packaging structure of upper and lower layers of glass, under the condition that the original WVTR level is maintained, the single-side thickness is reduced from 0.5 mm of the traditional glass to 130 [mu] m of the barrier film, the whole weight is reduced, the purpose of thinning is achieved, and because of the bendable characteristic of the flexible barrier film, the perovskite photovoltaic cell can be bent, and the production cost is reduced. And the feasibility of curved surface application is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic packaging, and in particular to a novel flexible photovoltaic packaging structure. Background Art

[0002] At present, the production method of rigid perovskite photovoltaic cells is as follows: a transparent electric-transmitting layer (e.g., ITO) is coated on the glass substrate, and then the perovskite photovoltaic cell components are made (including electron transport layer, photovoltaic material layer, hole transport layer), and then the glass coated with the transparent electric-transmitting layer is used for packaging;

[0003] However, although the perovskite photovoltaic cells manufactured by this process have water resistance that meets the requirements (WVTR≦8E-3 g / m2-day), their use is limited to flat scenes because the upper and lower substrates are made of glass and are easy to break when bent. In addition, the unit weight is heavy, so it is not possible to lay a large area on the roof due to the lack of weight resistance of old roofs;

[0004] Therefore, for the above-mentioned traditional perovskite photovoltaic cell packaging technology, although the water barrier can meet the requirements (WVTR≦8E-3 g / m2-day), since the upper and lower substrates are both made of glass, they are easy to break when bent, and their use is limited to all-plane scenarios. In addition, the unit weight is heavy, and the old roofs are not heavy enough to be laid on the roofs on a large area. A novel flexible photovoltaic packaging structure can be designed. The packaging structure replaces the upper and lower glass layers with a flexible barrier film. While maintaining the original WVTR level, not only is the single-side thickness reduced from 0.5mm of traditional glass to 130um of the barrier film, thereby reducing the overall weight and achieving the purpose of lightness and thinness, but also due to the bendable characteristics of the flexible barrier film, the perovskite photovoltaic cell can be bent, increasing the feasibility of curved surface applications. Utility Model Content

[0005] In order to overcome the problem of traditional perovskite photovoltaic cell packaging technology, although the water barrier can meet the requirements (WVTR≦8E-3 g / m2-day), since the upper and lower substrates are both made of glass, they are easy to break when bent, and their use is limited to all-plane scenarios. In addition, the unit weight is heavy, and it is not possible to lay it on a large area on the roof due to the lack of weight resistance of old roofs.

[0006] The technical solution of the utility model is: a novel flexible photovoltaic packaging structure, including a photovoltaic cell, the photovoltaic cell includes a hole transport layer, a photovoltaic material layer and an electron transport layer, the upper and lower ends of the photovoltaic cell are attached with a flexible barrier film, the flexible barrier film includes a transparent conductive layer and a barrier layer, the transparent conductive layer includes a buffer layer, the barrier layer includes a barrier layer substrate, the transparent conductive layer is located on the top surface of the photovoltaic cell, and the barrier layer is located on the top surface of the transparent conductive layer.

[0007] Preferably, by replacing the encapsulation structure of the upper and lower glass layers with a flexible barrier film, while maintaining the original WVTR level, not only does its single-sided thickness decrease from 0.5 mm of traditional glass to 130 μm of the barrier film, reducing the overall weight and achieving the goal of being thinner and lighter, but also due to the bendable characteristics of the flexible barrier film, the perovskite photovoltaic cell can be bent, increasing the feasibility of curved surface applications.

[0008] Preferably, the total thickness of the transparent conductive layer and the barrier layer is 130 μm.

[0009] Preferably, the transparent conductive layer is made of materials such as ITO (indium tin oxide) and IZO (indium zinc oxide).

[0010] Preferably, the buffer layer is a laminated combination of SiNx (silicon nitride) and SiOx (silicon oxide).

[0011] Preferably, positioning bumps are provided on the top surfaces of both the photovoltaic cell and the transparent conductive layer, and the positioning bumps are an integral structure with the photovoltaic cell and the transparent conductive layer.

[0012] Preferably, at the bottom end of the transparent conductive layer and the barrier layer, there is a positioning groove, and the top end of the positioning bump extends to the inside of the positioning groove.

[0013] Advantages of the present utility model:

[0014] By replacing the encapsulation structure of the upper and lower glass layers with a flexible barrier film, while maintaining the original WVTR level, not only does its single-sided thickness decrease from 0.5 mm of traditional glass to 130 μm of the barrier film, reducing the overall weight and achieving the goal of being thinner and lighter, but also due to the bendable characteristics of the flexible barrier film, the perovskite photovoltaic cell can be bent, increasing the feasibility of curved surface applications. Description of the drawings

[0015] Figure 1 Shows the overall structural schematic diagram of the present utility model;

[0016] Figure 2 Shows the cross-sectional structural schematic diagram of the whole of the present utility model;

[0017] Figure 3 Shows the structural schematic diagram of the photovoltaic cell of the present utility model.

[0018] Description of the reference numerals: 1, photovoltaic cell; 101, hole transport layer; 102, photovoltaic material layer; 103, electron transport layer; 2, transparent conductive layer; 3, buffer layer; 4, barrier layer; 5, barrier layer substrate; 6, positioning bump; 7, positioning groove. Detailed implementation manners

[0019] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Please refer to ( Figures 1-3 ), the present utility model provides a technical solution: a novel flexible photovoltaic encapsulation structure, including a photovoltaic cell 1, the photovoltaic cell 1 includes a hole transport layer 101, a photovoltaic material layer 102 and an electron transport layer 103. Flexible barrier films are attached to the upper and lower ends of the photovoltaic cell 1. The flexible barrier film includes a transparent conductive layer 2 and a barrier layer 4. The transparent conductive layer 2 includes a buffer layer 3. The barrier layer 4 includes a barrier layer substrate 5. The transparent conductive layer 2 is located on the top surface of the photovoltaic cell 1, and the barrier layer 4 is located on the top surface of the transparent conductive layer 2. Thus, the photovoltaic cell 1 is protected by the transparent conductive layer 2 and the barrier layer 4.

[0021] Please refer to ( Figure 1 ), in this embodiment, the total thickness of the transparent conductive layer 2, the buffer layer 3, the barrier layer 4 and the barrier layer substrate 5 is 130 um. The transparent conductive layer 2 is made of materials such as ITO (indium tin oxide) and IZO (indium zinc oxide). The buffer layer 3 is a laminated combination of SiNx (silicon nitride) and SiOx (silicon oxide), thereby improving the lightness of the barrier film.

[0022] Please refer to ( Figure 2 ), in this embodiment, positioning bumps 6 are provided on the top surfaces of both the photovoltaic cell 1 and the transparent conductive layer 2. The positioning bumps 6 are an integral structure with the photovoltaic cell 1 and the transparent conductive layer 2. The top ends of the positioning bumps 6 are provided with positioning grooves 7 at the bottom ends of the transparent conductive layer 2 and the barrier layer 4. The top ends of the positioning bumps 6 extend to the inside of the positioning grooves, facilitating the attachment of the photovoltaic cell panel 1, the transparent conductive layer 2 and the barrier layer 4 to each other.

[0023] During operation, first, the barrier layer substrate 5 is heat-treated until the shrinkage rates in the TD and MD directions are both less than 0.5%. Then, hydroxylation treatment is performed on one surface of the barrier layer substrate 5. Next, it enters the ALD deposition equipment cavity. In a vacuum environment, an "oxide metal precursor" is introduced into the cavity by an inert gas and reacts with pure water introduced by the inert gas to alternately form a metal oxide film on the substrate surface, forming a highly dense barrier layer 4. On the surface of the barrier layer 4, the buffer layer 3 is deposited by physical vapor deposition (PVD). Then, on the surface of the buffer layer 3, the transparent conductive layer 2 is deposited by physical vapor deposition (PVD). Then, the perovskite photovoltaic cell is fabricated, with the electron transport layer, the photovoltaic material layer, and the hole transport layer coated respectively. Then, the completed barrier layer 4 and the transparent conductive layer 2 are attached to the top of the perovskite photovoltaic cell, completing the perovskite photovoltaic cell encapsulated with the flexible barrier film substrate.

[0024] Through the above steps, the traditional perovskite photovoltaic cell packaging technology has been solved. Although the water barrier performance can meet the requirements (WVTR≦8E-3 g / m2-day), the upper and lower substrates are made of glass, which are easy to break when bent. Its use is limited to all-plane scenarios. In addition, the unit weight is heavy, and the old roof is not heavy enough to be laid on a large area on the roof.

Claims

1. A novel flexible photovoltaic packaging structure, comprising a photovoltaic cell (1), wherein the photovoltaic cell (1) comprises a hole transport layer (101), a photovoltaic material layer (102) and an electron transport layer (103); characterized in that: The invention also comprises a flexible barrier film attached to the upper and lower ends of a photovoltaic cell (1), the flexible barrier film comprising a transparent conductive layer (2) and a barrier layer (4), the transparent conductive layer (2) comprising a buffer layer (3), the barrier layer (4) comprising a barrier layer substrate (5), the transparent conductive layer (2) being located on the top surface of the photovoltaic cell (1), and the barrier layer (4) being located on the top surface of the transparent conductive layer (2).

2. A novel flexible photovoltaic packaging structure according to claim 1, characterized in that: The total thickness of the transparent conductive layer (2) and the barrier layer (4) is 130 um.

3. A novel flexible photovoltaic packaging structure according to claim 1, characterized in that: The transparent conductive layer (2) is made of materials such as ITO (indium tin oxide) and IZO (indium zinc oxide).

4. A novel flexible photovoltaic packaging structure according to claim 1, characterized in that: The buffer layer (3) is a stacked combination of SiNx (silicon nitride) and SiOx (silicon oxide).

5. A novel flexible photovoltaic packaging structure according to claim 1, characterized in that: The top surfaces of the photovoltaic cell (1) and the transparent conductive layer (2) are both provided with positioning convex blocks (6), and the positioning convex blocks (6) are an integrated structure with the photovoltaic cell (1) and the transparent conductive layer (2).

6. A novel flexible photovoltaic packaging structure according to claim 1, characterized in that: The top end of the positioning protrusion (6) is located at the bottom end of the transparent conductive layer (2) and the barrier layer (4), and a positioning groove (7) is provided. The top end of the positioning protrusion (6) extends to the inner side of the positioning groove.

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