Composite film for flexible perovskite solar cell manufacturing process and preparation method thereof
By using a composite film structure in flexible perovskite solar cells, which involves coating the upper and lower surfaces of a PET substrate with heat-resistant adhesive and a self-adsorbing adhesive, the adhesion problem between the film material and the rigid substrate is solved. This achieves the process requirements of alkali-resistant cleaning, high-temperature evaporation, and laser cutting, thereby improving the reliability and processing quality of the cells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-24
- Publication Date
- 2026-04-07
AI Technical Summary
Existing film materials are difficult to achieve uniform, stable and tight adhesion between flexible perovskite solar cells and rigid substrates. They cannot withstand strong alkaline cleaning solutions, are prone to softening and deformation during high-temperature evaporation processes, and have insufficient adhesion strength or poor thermal stability during laser cutting, affecting cell performance and processing quality.
A composite film containing a PET substrate is used. The upper and lower surfaces of the PET substrate are coated with a heat-resistant adhesive layer and a self-adsorbing adhesive layer, respectively, and a sandwich structure is formed by the first and second release films. The heat-resistant adhesive layer is composed of acrylic adhesive, curing agent, diluent and photoinitiator, and the self-adsorbing adhesive layer is composed of self-adsorbing adhesive, curing agent, retarder and diluent. Combined with a specific preparation process, the stability and adhesion strength of the film material are ensured.
It achieves stable and tight bonding between flexible perovskite solar cells and rigid substrates, withstands high-temperature evaporation and laser cutting during the manufacturing process, reduces defects such as bubbles, detachment and edge warping, and improves the reliability and lifespan of the cells.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of composite film technology, and in particular to a composite film for use in the fabrication of flexible perovskite solar cells and its preparation method. Background Technology
[0002] Perovskite solar cells, representing third-generation photovoltaic technology, have become a research hotspot in the field of solar cells due to their advantages such as low material cost, simple fabrication process, and high photoelectric conversion efficiency. These cells primarily utilize organic-inorganic hybrid materials with a perovskite crystal structure as the light-absorbing layer, and can be classified into lead halide perovskite and halide perovskite types. Their stable crystal structure, high light absorption coefficient, and excellent carrier mobility make them suitable for solution-based fabrication and give them the potential for large-scale production.
[0003] Flexible perovskite solar cells maintain high efficiency while also being lightweight, flexible, and rollable, making them suitable for emerging applications such as wearable devices, building-integrated photovoltaics, and mobile energy. The fabrication process typically involves multiple steps, including cleaning, vapor deposition, and laser cutting. Due to the limited mechanical strength of the flexible substrate, these processes must be completed with the assistance of a rigid substrate to ensure that the device does not deform, shift, or become damaged during processing.
[0004] However, the film material that serves as the adhesive and protective layer between flexible perovskite solar cells and rigid substrates still faces a series of technical challenges. Existing film materials often fail to simultaneously meet the following requirements: First, they cannot achieve uniform, stable, and tight adhesion during the full-surface lamination process, easily leading to bubbles, localized delamination, or stress concentration, affecting subsequent processes and device reliability; Second, they cannot withstand the effects of strongly alkaline cleaning solutions, easily causing swelling, corrosion, or interface peeling, resulting in decreased cell performance or even failure; Third, in high-temperature evaporation processes, the film material is prone to softening, deformation, or the release of volatile components, affecting the uniform deposition of functional layers and interface integrity; Fourth, in high-precision processing such as laser cutting, if the film material has insufficient adhesive strength or poor thermal stability, it is prone to edge warping, interlayer separation, or microcrack propagation, reducing cutting yield and device lifespan. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide a composite film for the fabrication of flexible perovskite solar cells and a method for preparing the same to solve the above-mentioned problem.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a composite film for the fabrication process of flexible perovskite solar cells, comprising a functional film, wherein the functional film comprises a PET substrate, the upper surface of the PET substrate is coated with a heat-resistant adhesive layer, and the lower surface of the PET substrate is coated with a self-adsorbing adhesive layer. The heat-resistant adhesive layer comprises the following components by weight: 50-65 parts acrylic glue 1-4 parts of curing agent 15-40 parts of diluent 0-2 parts of dispersant Photoinitiator 0.1-1.5 parts; The self-adsorbent adhesive layer comprises the following components by weight: 80-105 parts of self-adhesive adhesive 8-15 parts of curing agent 0-2 parts of delay agent Organotin catalyst 0.1-1 part 30-55 parts of diluent.
[0007] As a further embodiment of the present invention, the upper and lower surfaces of the functional membrane are respectively connected to a first release membrane and a second release membrane, and the first release membrane, the functional membrane and the second release membrane constitute a sandwich structure.
[0008] As a further embodiment of the present invention, the thickness of the first release film is 25-35 μm, the thickness of the functional film is 65-75 μm, and the thickness of the second release film is 45-55 μm.
[0009] As a further embodiment of the present invention, the thickness of the PET substrate is 45-55 μm, the thickness of the heat-resistant adhesive layer is 5-15 μm, and the thickness of the self-adsorbing adhesive layer is 5-15 μm.
[0010] As a further embodiment of the present invention, the acrylic adhesive in the heat-resistant adhesive layer component is acrylic adhesive 5040, the curing agent is N3390 curing agent, the dispersant is BY3700 dispersant, the photoinitiator is 185 photoinitiator, and the diluent is ethyl acetate diluent and methyl ethyl ketone diluent; the ethyl acetate diluent is 5-15 parts, and the methyl ethyl ketone diluent is 10-25 parts.
[0011] As a further aspect of the present invention, the method for preparing the heat-resistant adhesive layer is as follows: Step 1: Weigh out acrylic adhesive 5040, N3390 curing agent, ethyl acetate diluent, and BY3700 dispersant according to the weight parts, stir and disperse at 200-400 rpm for 10-15 minutes to obtain a mixed adhesive solution; Step 2: Weigh out 185% photoinitiator and methyl ethyl ketone diluent by weight, stir, and disperse at 300-600 rpm for 15-25 minutes to obtain a mixture. Step 3: Add the mixture to the mixed adhesive solution and stir and disperse at 200-400 rpm for 10-20 minutes, then degas under vacuum for 30 minutes.
[0012] As a further embodiment of the present invention, the self-adsorbent in the self-adsorbent layer component is UA80-04 self-adsorbent, the curing agent is BX-6269 curing agent, the retarder is acetylacetone retarder, and the diluent is methyl ethyl ketone diluent and toluene diluent, wherein the methyl ethyl ketone diluent is 20-35 parts and the toluene diluent is 10-20 parts.
[0013] As a further embodiment of the present invention, the preparation method of the self-adsorbing adhesive layer is as follows: weigh out UA80-04 self-adsorbing adhesive, BX-6269 curing agent, acetylacetone retarder, organotin catalyst, methyl ethyl ketone diluent, and toluene diluent by weight, stir and disperse at 300-600 rpm for 30-45 min, and degas under vacuum for 20 min.
[0014] A method for preparing a composite film for flexible perovskite solar cell fabrication includes the following steps: Step 1: Double-sided corona treatment is performed on the surface of the PET substrate, a self-adsorbing adhesive layer is coated, and release film B is laminated to obtain a semi-finished product; Step 2: Apply a heat-resistant adhesive layer to release film A and then laminate it to the PET substrate side of the above semi-finished product. Step 3: Place the film in a 45℃ drying oven for 48 hours to mature, and obtain the composite film.
[0015] As a further embodiment of the present invention, in step one, after the dyne value reaches 45 or above after corona treatment, a self-adsorbing adhesive layer is applied.
[0016] Since the present invention adopts the above technical solution, the advantages and positive effects of the present invention are: the composite film of the present invention can meet the requirements of stable and tight bonding between flexible perovskite solar cells and rigid substrates, and can also meet the requirements of complex processes such as alkali-resistant cleaning, high-temperature evaporation, and laser cutting in the manufacturing process of flexible perovskite solar cells. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of a composite film used in the fabrication process of flexible perovskite solar cells according to the present invention.
[0018] In the figure: 1 is the first release film, 2 is the functional film, 3 is the second release film, 4 is the PET substrate, 5 is the heat-resistant adhesive layer, and 6 is the self-adsorbing adhesive layer. Detailed Implementation
[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0020] like Figure 1As shown, this invention discloses a composite film for flexible perovskite solar cell fabrication, comprising a functional film 2. The functional film 2 includes a PET substrate 4, with a heat-resistant adhesive layer 5 coated on the upper surface and a self-adsorbing adhesive layer 6 coated on the lower surface. A first release film 1 and a second release film 3 are respectively connected to the upper and lower surfaces of the functional film 2, forming a sandwich structure. The thickness of the first release film 1 is 25-35 μm, the thickness of the functional film 2 is 65-75 μm, and the thickness of the second release film 3 is 45-55 μm. The thickness of the PET substrate 4 is 45-55 μm, the thickness of the heat-resistant adhesive layer 5 is 5-15 μm, and the thickness of the self-adsorbing adhesive layer 6 is 5-15 μm.
[0021] Example 1 The present invention discloses a composite film for the fabrication of flexible perovskite solar cells, wherein the thickness of the first release film 1 is 25 μm, the thickness of the functional film 2 is 65 μm, the thickness of the second release film 3 is 45 μm, the thickness of the PET substrate 4 is 45 μm, the thickness of the heat-resistant adhesive layer 5 is 5 μm, and the thickness of the self-adsorbing adhesive layer 6 is 10 μm.
[0022] The heat-resistant adhesive layer 5 comprises the following components by weight: 50 parts acrylic adhesive 5040, 1 part N3390 curing agent, 0.1 part 185 photoinitiator, 5 parts ethyl acetate diluent, and 10 parts methyl ethyl ketone diluent; The method for preparing the heat-resistant adhesive layer 5 is as follows: Step 1: Weigh 50 parts of acrylic adhesive 5040, 1 part of N3390 curing agent, and 5 parts of ethyl acetate thinner according to the weight ratio, stir and disperse at 200 rpm for 15 minutes to obtain a mixed adhesive solution; Step 2: Weigh 0.1 parts by weight of 185 photoinitiator and 10 parts by weight of methyl ethyl ketone diluent, stir and disperse at 600 rpm for 15 minutes to obtain a mixture; Step 3: Add the mixture to the mixed adhesive solution, stir and disperse at 200 rpm for 20 minutes, and then degas under vacuum for 30 minutes.
[0023] The self-adsorbent layer 6 comprises the following components by weight: 80 parts UA80-04 self-adsorbent, 8 parts BX-6269 curing agent, 0.1 parts organotin catalyst, 20 parts methyl ethyl ketone diluent, and 10 parts toluene diluent. The preparation method of the self-adsorbent adhesive layer 6 is as follows: weigh 80 parts of UA80-04 self-adsorbent adhesive, 8 parts of BX-6269 curing agent, 0.1 parts of organotin catalyst, 20 parts of methyl ethyl ketone diluent, and 10 parts of toluene diluent by weight, stir and disperse at 300 rpm for 45 min, and degas under vacuum for 20 min.
[0024] A method for preparing a composite film for flexible perovskite solar cell fabrication includes the following steps: Step 1: Double-sided corona treatment is performed on the surface of the PET substrate. After corona treatment, the dyne value reaches 45 or higher. Then, a self-adsorbing adhesive layer 6 is coated and a release film B is laminated to obtain a semi-finished product. Step 2: Apply heat-resistant adhesive layer 5 to release film A and then laminate it to the PET substrate side of the above semi-finished product. Step 3: Place the film in a 45℃ drying oven for 48 hours to mature, and obtain the composite film.
[0025] Example 2 The present invention discloses a composite film for the fabrication of flexible perovskite solar cells, wherein the thickness of the first release film 1 is 28 μm, the thickness of the functional film 2 is 69 μm, the thickness of the second release film 3 is 48 μm, the thickness of the PET substrate 4 is 48 μm, the thickness of the heat-resistant adhesive layer 5 is 8 μm, and the thickness of the self-adsorbing adhesive layer 6 is 13 μm.
[0026] The heat-resistant adhesive layer 5 comprises the following components by weight: 55 parts acrylic adhesive 5040, 2 parts N3390 curing agent, 1 part BY3700 dispersant, 0.5 parts 185 photoinitiator, 8 parts ethyl acetate diluent, and 15 parts methyl ethyl ketone diluent; The method for preparing the heat-resistant adhesive layer 5 is as follows: Step 1: Weigh 55 parts acrylic adhesive 5040, 2 parts N3390 curing agent, 8 parts ethyl acetate diluent, and 1 part BY3700 dispersant by weight, stir and disperse at 280 rpm for 14 minutes to obtain a mixed adhesive solution. Step 2: Weigh 0.5 parts of 185 photoinitiator and 15 parts of methyl ethyl ketone diluent by weight, stir, and disperse at 500 rpm for 18 minutes to obtain a mixture. Step 3: Add the mixture to the mixed adhesive solution, stir and disperse at 250 rpm for 18 minutes, and then degas under vacuum for 30 minutes.
[0027] The self-adsorbent layer 6 comprises the following components by weight: 90 parts UA80-04 self-adsorbent, 10 parts BX-6269 curing agent, 1 part acetylacetone retarder, 25 parts butanone diluent, and 14 parts toluene diluent. The preparation method of the self-adsorbent adhesive layer 6 is as follows: weigh 90 parts of UA80-04 self-adsorbent adhesive, 10 parts of BX-6269 curing agent, 1 part of acetylacetone retarder, 0.4 parts of organotin catalyst, 25 parts of butanone diluent, and 14 parts of toluene diluent by weight, stir and disperse at 400 rpm for 40 min, and degas under vacuum for 20 min.
[0028] A method for preparing a composite film for flexible perovskite solar cell fabrication includes the following steps: Step 1: Double-sided corona treatment is performed on the surface of the PET substrate. After corona treatment, the dyne value reaches 45 or higher. Then, a self-adsorbing adhesive layer 6 is coated and a release film B is laminated to obtain a semi-finished product. Step 2: Apply heat-resistant adhesive layer 5 to release film A and then laminate it to the PET substrate side of the above semi-finished product. Step 3: Place the film in a 45℃ drying oven for 48 hours to mature, and obtain the composite film.
[0029] Example 3 The present invention discloses a composite film for the fabrication of flexible perovskite solar cells, wherein the thickness of the first release film 1 is 32 μm, the thickness of the functional film 2 is 72 μm, the thickness of the second release film 3 is 51 μm, the thickness of the PET substrate 4 is 52 μm, the thickness of the heat-resistant adhesive layer 5 is 10 μm, and the thickness of the self-adsorbing adhesive layer 6 is 10 μm.
[0030] The heat-resistant adhesive layer 5 comprises the following components by weight: 60 parts acrylic adhesive 5040, 3 parts N3390 curing agent, 1.5 parts BY3700 dispersant, 0.9 parts 185 photoinitiator, 12 parts ethyl acetate diluent, and 20 parts methyl ethyl ketone diluent; The method for preparing the heat-resistant adhesive layer 5 is as follows: Step 1: Weigh 60 parts of acrylic adhesive 5040, 3 parts of N3390 curing agent, 12 parts of ethyl acetate diluent, and 1.5 parts of BY3700 dispersant by weight, stir and disperse at 350 rpm for 11 minutes to obtain a mixed adhesive solution; Step 2: Weigh 0.9 parts by weight of 185 photoinitiator and 20 parts by weight of methyl ethyl ketone diluent, stir and disperse at 400 rpm for 21 minutes to obtain a mixture; Step 3: Add the mixture to the mixed adhesive solution, stir and disperse at 350 rpm for 13 minutes, and then degas under vacuum for 30 minutes.
[0031] The self-adsorbent layer 6 comprises the following components by weight: 98 parts UA80-04 self-adsorbent, 12 parts BX-6269 curing agent, 1.5 parts acetylacetone retarder, 30 parts butanone diluent, and 17 parts toluene diluent. The preparation method of the self-adsorbent adhesive layer 6 is as follows: weigh 98 parts of UA80-04 self-adsorbent adhesive, 12 parts of BX-6269 curing agent, 1.5 parts of acetylacetone retarder, 0.7 parts of organotin catalyst, 30 parts of butanone diluent, and 17 parts of toluene diluent, stir and disperse at 500 rpm for 35 min, and degas under vacuum for 20 min.
[0032] A method for preparing a composite film for flexible perovskite solar cell fabrication includes the following steps: Step 1: Double-sided corona treatment is performed on the surface of the PET substrate. After corona treatment, the dyne value reaches 45 or higher. Then, a self-adsorbing adhesive layer 6 is coated and a release film B is laminated to obtain a semi-finished product. Step 2: Apply heat-resistant adhesive layer 5 to release film A and then laminate it to the PET substrate side of the above semi-finished product. Step 3: Place the film in a 45℃ drying oven for 48 hours to mature, and obtain the composite film.
[0033] Example 4 The present invention discloses a composite film for the fabrication of flexible perovskite solar cells, wherein the thickness of the first release film 1 is 35 μm, the thickness of the functional film 2 is 75 μm, the thickness of the second release film 3 is 55 μm, the thickness of the PET substrate 4 is 55 μm, the thickness of the heat-resistant adhesive layer 5 is 15 μm, and the thickness of the self-adsorbing adhesive layer 6 is 5 μm.
[0034] The heat-resistant adhesive layer 5 comprises the following components by weight: 65 parts acrylic adhesive 5040, 4 parts N3390 curing agent, 2 parts BY3700 dispersant, 1.5 parts 185 photoinitiator, 15 parts ethyl acetate diluent, and 25 parts methyl ethyl ketone diluent; The method for preparing the heat-resistant adhesive layer 5 is as follows: Step 1: Weigh 65 parts of acrylic adhesive 5040, 4 parts of N3390 curing agent, 15 parts of ethyl acetate diluent, and 2 parts of BY3700 dispersant according to the weight ratio, stir and disperse at 400 rpm for 10 minutes to obtain a mixed adhesive solution. Step 2: Weigh 1.5 parts by weight of 185 photoinitiator and 25 parts by weight of methyl ethyl ketone diluent, stir at 300 rpm and disperse for 25 minutes to obtain a mixture. Step 3: Add the mixture to the mixed adhesive solution, stir at 400 rpm and disperse for 10 minutes, then vacuum degas for 30 minutes.
[0035] The self-adsorbent layer 6 comprises the following components by weight: 105 parts UA80-04 self-adsorbent, 15 parts BX-6269 curing agent, 2 parts acetylacetone retarder, 35 parts butanone diluent, and 20 parts toluene diluent. The preparation method of self-adsorbent layer 6 is as follows: Weigh 105 parts of UA80-04 self-adsorbent, 15 parts of BX-6269 curing agent, 2 parts of acetylacetone retarder, 1 part of organotin catalyst, 35 parts of butanone diluent, and 20 parts of toluene diluent by weight, stir and disperse at 600 rpm for 30 min, and degas under vacuum for 20 min.
[0036] A method for preparing a composite film for flexible perovskite solar cell fabrication includes the following steps: Step 1: Double-sided corona treatment is performed on the surface of the PET substrate. After corona treatment, the dyne value reaches 45 or higher. Then, a self-adsorbing adhesive layer 6 is coated and a release film B is laminated to obtain a semi-finished product. Step 2: Apply heat-resistant adhesive layer 5 to release film A and then laminate it to the PET substrate side of the above semi-finished product. Step 3: Place the film in a 45℃ drying oven for 48 hours to mature, and obtain the composite film.
[0037] Comparative Example 1 used P-170 UV anti-adhesion film from Dongguan Ruihaoxiang New Material Technology Co., Ltd.
[0038] Comparative Example 2 used Limeng UV anti-tack film A15010-32 UV anti-tack film.
[0039] Comparative Example 3 used the HPA-UV2620 UV anti-sticking film from Suzhou Hechang Electronic Materials Co., Ltd.
[0040] Comparative Example 4 used TL-P6315U UV anti-adhesion film from Jiangsu Terilliang New Material Technology Co., Ltd.
[0041] , As shown in Table 1, the UV peel force of Examples 1-4 is significantly lower than that of Comparative Examples 1-4. Moreover, compared with the comparative products, it has better resistance to acids, alkalis and high temperatures. This product can firmly adsorb the glass to be etched onto the carrier plate and can also be easily peeled off after UV irradiation, thereby reducing the risk of plate breakage.
[0042] When reusing the product of this invention, the second release film is first peeled off, the self-adhesive layer 6 is attached to the carrier plate, the first release film is then peeled off, and the heat-resistant adhesive layer 5 is attached to the plate to be processed. Because the self-adhesive layer 6 has good air-purification self-adhesion properties, it can quickly and tightly adhere to the carrier plate. The product of this invention achieves the firm adsorption of the glass to be etched onto the carrier plate, and the heat-resistant adhesive can be easily peeled off after being irradiated with specific ultraviolet light, thereby reducing the risk of plate breakage.
[0043] Specific embodiments of the present invention have been described, but those skilled in the art should understand that these are merely illustrative examples, and various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is defined only by the appended claims.
Claims
1. A composite film for use in the fabrication of flexible perovskite solar cells, characterized in that: The invention includes a functional membrane (2), which includes a PET substrate (4), the upper surface of which is coated with a heat-resistant adhesive layer (5), and the lower surface of which is coated with a self-adsorbing adhesive layer (6). The heat-resistant adhesive layer (5) comprises the following components by weight: 50-65 parts acrylic glue 1-4 parts of curing agent 15-40 parts of diluent 0-2 parts of dispersant Photoinitiator 0.1-1.5 parts; The self-adsorbing adhesive layer (6) comprises the following components by weight: 80-105 parts of self-adhesive adhesive 8-15 parts of curing agent 0-2 parts of delay agent Organotin catalyst 0.1-1 part 30-55 parts of diluent.
2. The composite film for flexible perovskite solar cell fabrication process according to claim 1, characterized in that: The upper and lower surfaces of the functional membrane (2) are respectively connected by a first release membrane (1) and a second release membrane (3), and the first release membrane (1), the functional membrane (2) and the second release membrane (3) form a sandwich structure.
3. The composite film for flexible perovskite solar cell fabrication process according to claim 2, characterized in that: The thickness of the first release film (1) is 25-35 μm, the thickness of the functional film (2) is 65-75 μm, and the thickness of the second release film (3) is 45-55 μm.
4. The composite film for flexible perovskite solar cell fabrication process according to claim 1, characterized in that: The PET substrate (4) has a thickness of 45-55 μm, the heat-resistant adhesive layer (5) has a thickness of 5-15 μm, and the self-adsorbing adhesive layer (6) has a thickness of 5-15 μm.
5. The composite film for flexible perovskite solar cell fabrication process according to claim 1, characterized in that: The acrylic adhesive in the heat-resistant adhesive layer (5) is acrylic adhesive 5040, the curing agent is N3390 curing agent, the dispersant is BY3700 dispersant, the photoinitiator is 185 photoinitiator, and the diluent is ethyl acetate diluent and methyl ethyl ketone diluent; the ethyl acetate diluent is 5-15 parts, and the methyl ethyl ketone diluent is 10-25 parts.
6. The composite film for flexible perovskite solar cell fabrication process according to claim 5, characterized in that: The method for preparing the heat-resistant adhesive layer (5) is as follows: Step 1: Weigh out acrylic adhesive 5040, N3390 curing agent, ethyl acetate diluent, and BY3700 dispersant according to the weight parts, stir and disperse at 200-400 rpm for 10-15 minutes to obtain a mixed adhesive solution; Step 2: Weigh out 185% photoinitiator and methyl ethyl ketone diluent by weight, stir, and disperse at 300-600 rpm for 15-25 minutes to obtain a mixture. Step 3: Add the mixture to the mixed adhesive solution and stir and disperse at 200-400 rpm for 10-20 minutes, then degas under vacuum for 30 minutes.
7. The composite film for flexible perovskite solar cell fabrication process according to claim 1, characterized in that: The self-adsorbent adhesive in the self-adsorbent layer (6) is UA80-04 self-adsorbent adhesive, the curing agent is BX-6269 curing agent, the retarder is acetylacetone retarder, and the diluent is methyl ethyl ketone diluent and toluene diluent, with 20-35 parts of methyl ethyl ketone diluent and 10-20 parts of toluene diluent.
8. A composite film for flexible perovskite solar cell fabrication according to claim 7, characterized in that: The preparation method of the self-adsorbing adhesive layer (6) is as follows: weigh UA80-04 self-adsorbing adhesive, BX-6269 curing agent, acetylacetone retarder, organotin catalyst, butanone diluent, and toluene diluent according to the weight parts, stir and disperse at 300-600 rpm for 30-45 min, and degas under vacuum for 20 min.
9. A method for preparing a composite film for flexible perovskite solar cell fabrication according to any one of claims 1-8, characterized in that: Specific steps as follows: Step 1: Double-sided corona treatment is performed on the surface of the PET substrate, a self-adsorbing adhesive layer (6) is coated, and a release film B is laminated to obtain a semi-finished product; Step 2: Apply a heat-resistant adhesive layer (5) to release film A and then laminate it to the PET substrate side of the above semi-finished product. Step 3: Place the film in a 45℃ drying oven for 48 hours to mature, and obtain the composite film.
10. A method for preparing a composite film for flexible perovskite solar cell fabrication according to claim 9, characterized in that: In step one, after corona treatment, when the dyne value reaches 45 or above, a self-adsorbing adhesive layer is applied (6).