CN-121285166-B - Flexible perovskite photovoltaic cell and packaging method thereof

Abstract

The invention discloses a flexible perovskite photovoltaic cell and a packaging method thereof, and belongs to the technical field of perovskite photovoltaic cells. The technical problem to be solved is to reduce the water vapor permeability of the edge of the flexible perovskite photovoltaic cell component under the condition that butyl rubber is not adopted and the packaging margin can be ultra-narrow. The technical scheme is that the flexible perovskite photovoltaic cell comprises a water-oxygen barrier film, a glue layer, a flexible perovskite photovoltaic cell piece and a barrier layer, wherein the barrier layer comprises an inner layer, a middle layer and an outer layer, the inner layer comprises a polymer and a sheet material, the middle layer comprises a polymer, hollow SiO 2 microspheres and a sheet material, and the outer layer comprises a polymer and fluorinated SiO 2 .

Inventors

• WANG YALI
• CHEN YUJIN
• YANG FU
• GUO CHENGXIN
• TIAN QINGQING
• Pu Junmei
• GU JIAQI
• ZHANG LU

Assignees

• 苏州尚柔新能源有限公司

Dates

Publication Date

20260508

Application Date

20251210

Claims (9)

1. 1. The flexible perovskite photovoltaic cell comprises a window water-oxygen barrier film, an upper adhesive layer, a flexible perovskite photovoltaic cell piece, a barrier layer, a lower adhesive layer and a bottom water-oxygen barrier film from bottom to top, and is characterized in that the barrier layer comprises an inner layer, an intermediate layer and an outer layer from bottom to top in sequence, wherein the inner layer comprises a polymer and sheet material composite layer, the intermediate layer comprises a polymer, hollow SiO 2 microspheres and sheet material alternating layers, and the outer layer comprises a polymer and fluorinated SiO 2 enrichment layer; The polymers of the inner layer, the middle layer and the outer layer are fluorocarbon polymer coating liquid and comprise fluorine-containing resin, wherein the fluorine-containing resin is at least one of polytetrafluoroethylene, perfluoropolyether acrylate or fluorinated polyurethane; The inner layer, the middle layer and the outer layer further comprise a silane coupling agent; The inner layer comprises, by mass, 85-91% of a polymer, 1-8% of a sheet material and 1-8% of a silane coupling agent.
2. 2. The flexible perovskite photovoltaic cell of claim 1, wherein the polymer further comprises a solvent.
3. 3. The flexible perovskite photovoltaic cell of claim 1, wherein the platelet material is at least one of graphene, graphene oxide, montmorillonite, boron nitride, or nano-mica, with an aspect ratio >100.
4. 4. The flexible perovskite photovoltaic cell according to claim 1, wherein the fluorinated SiO 2 is SiO 2 with surface modified with-CF 3 groups, the particle size is 10-20nm, the hollow SiO 2 microsphere has a particle size of 50-100nm, and the shell thickness is 5-15nm.
5. 5. The flexible perovskite photovoltaic cell of claim 1, wherein the intermediate layer comprises, in mass percent, 90-95% polymer, 2% -6% hollow SiO 2 microspheres, 1-5% platelet material, and 1-5% silane coupling agent.
6. 6. The flexible perovskite photovoltaic cell of claim 1, wherein the outer layer comprises, in mass percent, 85-95% polymer, 4% -10% fluorinated SiO 2 , and 1-5% silane coupling agent.
7. 7. The flexible perovskite photovoltaic cell as recited in claim 1, wherein, The total thickness of the barrier layer is 0.5-10 mu m; The effective coating area of the barrier layer is larger than the effective area of the battery, and the edge distance of the periphery is less than or equal to 1mm.
8. 8. The method of packaging a flexible perovskite photovoltaic cell according to any one of claims 1 to 7, comprising the steps of: (1) Coating and curing an inner layer, an intermediate layer and an outer layer on the surface of the back electrode of the flexible perovskite photovoltaic cell in sequence to obtain a flexible perovskite photovoltaic cell with a barrier layer; (2) The surface of the flexible perovskite photovoltaic cell with the barrier layer is packaged with the window water-oxygen barrier film and the bottom water-oxygen barrier film through the adhesive layer.
9. 9. A flexible photovoltaic product comprising the flexible perovskite photovoltaic cell of any one of claims 1-7.

Description

Flexible perovskite photovoltaic cell and packaging method thereof Technical Field The invention provides a flexible perovskite photovoltaic cell and a packaging method thereof, and belongs to the technical field of perovskite photovoltaic cells. Background For understanding the technical content of the present invention: The problem of water vapor permeation at the edges of perovskite cells has been a key factor limiting their development. Moisture permeation can cause chemical reactions to occur in the internal materials of the battery, thereby affecting the performance and life of the battery. Encapsulation is one of the best methods to address perovskite cell stability issues and to extend the lifetime of the device. The reliable packaging technology can realize excellent sealing performance of packaging, form a stable working environment, prevent invasion of external water and oxygen, and also can prevent products of battery decomposition from overflowing from the system. For example, in the solution of combining a water-oxygen barrier film with a UV curing glue widely used in OPV products, the water vapor permeability of the glue is high (generally, the water vapor permeability of the high barrier glue is 3-6g/m 2. Day, the water vapor permeability of the common glue is 10-20g/m 2. Day), which is equivalent to that of a packaging adhesive film (EVA, POE, EPE) commonly used in photovoltaic products, and the long-term application of the glue also has great risks. At present, the encapsulation technology of polyisobutylene, polyolefin low-temperature adhesive film and glass combination ensures that the glass-substrate perovskite battery has excellent durability. The side methyl groups in the butyl rubber molecular chain are densely arranged, so that the thermal movement of polymer molecules is limited, the butyl rubber molecular chain has lower water vapor permeability (10 -2g/m2/day) and good air tightness. In the fields of mobile phone charging shells, notebook/electronic book power expansion, wireless charging, internet of things (IoT) devices and the like, perovskite batteries are required to have stability, and are also required to be small in size (less than 5cm 2), light and thin, attractive in appearance and narrow in packaging margin (less than or equal to 5 mm). The material combination packaging scheme of the ultra-high water oxygen barrier film combined with the polyolefin adhesive film and the butyl adhesive is adopted by the flexible perovskite photovoltaic cell, the appearance, the size and the like do not meet the requirements, and the butyl adhesive edge is usually 1cm wide, so that the effective area of the cell is greatly reduced. And removing the butyl rubber with sealed edges to obtain ultra-narrow packaging margins, so that higher requirements are put on the water vapor barrier performance of the edges of the flexible perovskite photovoltaic cells. Similar TFE in-line thin film encapsulation packaging schemes with OLED products can meet the above requirements, but multilayer (4-6 layer) structural designs, such as stacked barrier films with alternating deposition of inorganic (Al 2O3、SiO2, siNx)/organic (polyacrylate), reduce WVTR below 10-6 g/m 2/day (e.g., flex series of Mitsui chemistry, U.S.A.). However, the scheme has the advantages of complex process, expensive equipment, high cost and long time, and is not suitable for the popular and low-cost application trend of the current flexible photovoltaic products. Chinese patent CN118632552a discloses a high-efficiency flexible perovskite photovoltaic cell packaging method, but the patent mainly describes a preparation method of a water blocking film that can be pasted, the solution battery is a small-size unit cell, the packaging solution does not mention any protection of edge water vapor side leakage, only provides efficiency retention after 25 ℃ and 85% rh for 100 hours, and does not disclose long-time demonstration of efficiency retention rate. Therefore, how to effectively solve the problem of water vapor permeation at the edge of the flexible perovskite photovoltaic cell under the conditions of no butyl rubber and ultra-narrow packaging margin is a technical problem to be solved at present. Disclosure of Invention The invention aims to provide that: a flexible perovskite photovoltaic cell, a packaging method thereof and related technologies thereof are provided, so as to solve the technical problems of reducing the water vapor permeability of the edge of the flexible perovskite photovoltaic cell or the combination thereof under the condition of not adopting butyl rubber and being capable of ultra-narrow packaging margin. Description of the terminology: Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the claimed subject matter belongs. All patents, patent inventions, and publications cited herein are incorporated