An integrated flexible perovskite solar cell electronic price tag

Abstract

The utility model discloses an integrated electronic price tag of flexible perovskite solar cell, including rear housing, electronic screen and flexible perovskite solar cell, the rear housing includes first casing and second casing, and the second casing is set up around the circumference of first casing, the battery is set in the inner wall of second casing, makes full use of the sidewall and the arc angle area, and the effective light receiving area is improved greatly, realizes multi -angle high -efficient light absorption, and does not occupy the front display area, guarantees visual beautiful. Among them, the second casing of high light transmittance guarantees the light transmission to the flexible battery surface, and provides physical protection for it. The integrated flexible battery perfect fit sidewall arc angle, avoid light absorption dead angle simultaneously, can also save complex circuit and redundant wiring, simplify circuit design and reduce cost. In addition, the ultrathin flexible battery almost does not increase equipment thickness and weight, and has excellent bending resistance and impact resistance at the same time, improves overall durability, meets the light weight development trend of electronic equipment.

Description

Technical Field

[0001] This utility model belongs to the field of electronic display technology and relates to an electronic price tag integrated with an integrated flexible perovskite solar cell. Background Technology

[0002] In today's wave of digital transformation in retail, warehousing, and other scenarios, electronic shelf labels (ESCs) have become core terminal devices connecting online and offline channels, enabling real-time price updates, dynamic inventory management, and consumer interaction. From supermarket fresh produce sections to e-commerce warehouse picking shelves, from convenience store snack cabinets to high-end brand counters, ESCs quickly synchronize product information via wireless communication, significantly reducing errors and costs associated with manual price adjustments and improving operational efficiency. However, ensuring a continuous and stable power supply for ESCs remains a key bottleneck for their widespread adoption. Traditional button batteries require frequent replacements, increasing maintenance costs and potentially damaging the equipment due to leakage. While solar cells, as a self-powered green solution, avoid these problems, their inherent limitations due to rigid solar cells prevent them from fully meeting the design requirements of ESCs.

[0003] Rigid solar cells are typically placed on the front frame of electronic shelf labels, resulting in low front area utilization and limited effective light-receiving area. This not only restricts photoelectric conversion efficiency but also affects the display effect and overall aesthetics of the electronic screen. If multiple rigid solar cells are dispersed on the side wall surface of the electronic shelf label to increase the effective light-receiving area, multiple electrode leads must be used to bring out the electrodes separately, or additional circuit connection devices must be used to cascade the cells. This undoubtedly increases the overall process complexity and significantly raises the circuit design cost.

[0004] In addition, rigid solar cells are heavy and thick, and integrating them into electronic shelf labels will increase the overall weight of the electronic shelf labels, which is not in line with the development trend of making electronic devices thinner and lighter. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides an integrated flexible perovskite solar cell-integrated electronic shelf label, which effectively solves the problems of insufficient light-receiving area caused by the rigid solar cells being limited to front-side arrangement, and the complexity of circuit connection caused by the dispersed arrangement of multiple cells in the side area. At the same time, it overcomes the technical bottleneck of its own large weight and thickness, which makes it difficult to meet the requirements of thin and light electronic shelf labels.

[0006] This utility model is achieved through the following technical solution: An integrated flexible perovskite solar cell-integrated electronic price tag includes a back cover, an electronic screen, and a flexible perovskite solar cell; The rear shell includes: a first shell and a second shell; the second shell is disposed around the periphery of the first shell; the first shell and the second shell together form a receiving cavity; The electronic screen is located on one side of the first housing and is detachably connected to the first housing; The flexible perovskite solar cell is located within the receiving cavity and is disposed around the second housing; The flexible perovskite solar cell provides power to the electronic screen.

[0007] Preferably, the receiving cavity includes a first inner cavity and a second inner cavity that are connected to each other; the first inner cavity is located inside the first housing and is used to accommodate the circuit board in the electronic price tag; the second inner cavity is surrounded by the inner wall of the second housing, and the flexible perovskite solar cell is arranged around the inner wall of the second inner cavity.

[0008] Preferably, the second inner cavity includes a first chamber, a second chamber, and a third chamber that are connected in communication. The flexible perovskite solar cell includes an integrally formed first sub-cell, a second sub-cell, and a third sub-cell, which are respectively disposed on the inner walls of the first chamber, the second chamber, and the third chamber.

[0009] Preferably, the flexible perovskite solar cell further includes: a connecting sub-cell, which is disposed in the arc-shaped region formed at the connection between the first chamber and the second chamber, and the arc-shaped region formed at the connection between the second chamber and the third chamber; the connecting sub-cell is used to connect the first sub-cell, the second sub-cell, and the third sub-cell.

[0010] Preferably, the extension direction of the connecting sub-battery is arc-shaped.

[0011] Preferably, the electronic price tag further includes: conductive foam, one end of which is electrically connected to the flexible perovskite solar cell, and the other end of which is electrically connected to the circuit board; wherein the circuit board is electrically connected to the electronic screen.

[0012] Preferably, the second housing is a housing structure made of a light-transmitting material with a light transmittance of >90%.

[0013] Preferably, the thickness of the flexible perovskite solar cell is 0.1 mm to 1 mm.

[0014] Preferably, the electronic price tag further includes a transparent adhesive, through which the flexible perovskite solar cell is bonded to the second housing.

[0015] Preferably, the electronic price tag further includes a screen adhesive, through which the electronic screen is detachably connected to the back cover.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: This utility model discloses an integrated flexible perovskite solar cell-integrated electronic shelf label, comprising a back shell, an electronic screen, and a flexible perovskite solar cell. The back shell includes a first shell and a second shell surrounding its periphery. By surrounding the flexible perovskite solar cell on the inner wall of the second shell, the arc-shaped areas of the side walls and side wall connections of the electronic shelf label are fully utilized, significantly increasing the effective light-receiving area, achieving efficient absorption of ambient light from multiple angles, and avoiding obstruction of the front display screen. While ensuring the visual effect and overall aesthetics of the display, the photoelectric conversion efficiency is significantly improved. Furthermore, the second shell is made of a light-transmitting material with a transmittance >90%, which not only ensures efficient penetration of ambient light to the surface of the flexible perovskite solar cell but also provides physical protection for the cell, isolating it from dust, moisture, and minor mechanical friction, thus extending the cell's lifespan.

[0017] The flexible battery with its integrated bending structure perfectly fits the curved corners of the electronic shelf label, avoiding the light absorption dead zones caused by the shape limitations of traditional rigid batteries. It also avoids the complex cascaded circuits and redundant wiring of rigid batteries when distributed, simplifying the circuit structure and assembly process, reducing the risk of connection failures and lowering design and manufacturing costs. Furthermore, the extremely thin profile of the flexible perovskite solar cell adds almost no increase to the overall thickness and weight of the electronic shelf label, allowing it to maintain a slim and lightweight design while increasing power generation capacity, aligning with the trend towards lightweight and miniaturized electronic devices. In addition, the flexibility of the perovskite solar cell provides it with a certain degree of resistance to bending and impact. Compared to the more brittle rigid solar cells, it is better able to withstand minor collisions or pressures that the electronic shelf label may encounter during daily use and transportation, reducing the probability of battery damage and improving the overall durability of the product. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an electronic price tag integrated with an integrated flexible perovskite solar cell according to this utility model. Figure 2This is an exploded view of an electronic price tag integrated with an integrated flexible perovskite solar cell, as described in this utility model. Figure 3 This is a partial structural schematic diagram of an electronic price tag integrated with an integrated flexible perovskite solar cell according to this utility model. Figure 4 This is a schematic diagram of the first and second inner cavities of an electronic price tag integrated with an integrated flexible perovskite solar cell according to this utility model. Figure 5 This is a schematic diagram of the structure of a flexible perovskite solar cell integrated into an electronic price tag, which is a type of flexible perovskite solar cell according to this utility model. Figure 6 This is a cross-sectional view and a partial enlarged view of point A of an integrated flexible perovskite solar cell electronic price tag according to this utility model. Figure 7 This is a schematic diagram of the packaging of the flexible perovskite solar cell in this utility model; Figure 8 The results of efficiency tests of the flexible perovskite solar cell prepared in Example 1 of this utility model under different light intensities are shown. Figure 9 The results show the bending stability test results of the flexible perovskite solar cell prepared in Example 1 of this utility model.

[0020] The components are: 1. Back shell, 11. First shell, 12. Second shell, 13. Transparent adhesive, 14. First inner cavity, 15. Second inner cavity, 151. First chamber, 152. Second chamber, 153. Third chamber, 2. Electronic screen, 21. Screen adhesive, 3. Flexible perovskite solar cell, 31. First sub-cell, 32. Second sub-cell, 33. Third sub-cell, 34. Connecting sub-cell, 4. Conductive foam, 5. Circuit board. Detailed Implementation

[0021] 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 only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings: Example 1 like Figures 1-3 As shown, this utility model provides an integrated flexible perovskite solar cell-integrated electronic price tag, including a back cover 1, an electronic screen 2, and a flexible perovskite solar cell 3.

[0028] In this application, the back cover 1 of the electronic price tag may include a first cover 11 and a second cover 12. The second cover 12 may be disposed around the periphery of the first cover 11, and the first cover 11 and the second cover 12 may together form a receiving cavity. For example, the second cover 12 may be a bent structure, and the second cover 12 may extend circumferentially along the upper surface and sidewall region of the first cover 11, together forming a single cover structure.

[0029] It should be noted that the rear shell 1 can be a shell formed by double injection molding, that is, the rear shell 1 can be an integral structure formed by combining the first shell 11 and the second shell 12 by double injection molding.

[0030] The first shell 11 in the rear shell 1 can be a shell structure made of a light-transmitting material, or it can be a shell structure made of an opaque material. For example, the light-transmitting material can be one of optical grade polycarbonate (PC) or poly(methyl methacrylate) (PMMA); the opaque material can be acrylonitrile butadiene styrene copolymer (ABS), colored polycarbonate (PC), or thermoplastic polyurethane elastomer (TPU).

[0031] The second housing 12 in the rear housing 1 can be a housing structure made of a light-transmitting material with a light transmittance > 90%. For example, the second housing 12 can be a housing structure made of optical-grade polycarbonate (PC) or poly(methyl methacrylate) (PMMA). In this case, ambient light (such as natural light, indoor lighting, etc.) can penetrate the second housing 12 to a large extent and directly illuminate the interior of the receiving cavity, thus avoiding light loss caused by the second housing 12 blocking the ambient light.

[0032] In this embodiment, the electronic screen 2 in the electronic price tag can be located on one side of the first housing 11 and can be detachably connected to the first housing 11. Specifically, the electronic screen 2 can be located on the side of the first housing 11 away from the receiving cavity inside the rear housing 1, that is, the electronic screen 2 is located on the front display side of the electronic price tag, and the display surface of the electronic screen 2 can face the user to adapt to the user's viewing needs, ensuring that the user can clearly read the screen information.

[0033] In this application, the flexible perovskite solar cell in the electronic shelf label can be located within a housing cavity and can be arranged around the second housing 12. In this case, since the second housing 12 is a housing structure made of a light-transmitting material with a light transmittance > 90%, ambient light can directly illuminate the surface of the flexible perovskite solar cell 3 located inside the housing cavity and arranged around the second housing 12, so as to ensure that the flexible perovskite solar cell 3 can fully absorb light energy and efficiently complete photoelectric conversion.

[0034] It should be noted that the flexible perovskite solar cell 3 can provide power to the electronic screen 2. In this case, when ambient light shines on the flexible perovskite solar cell 3 on the surface of the electronic shelf label, the flexible perovskite solar cell 3 directly converts light energy into electrical energy, which is then transmitted to the electronic screen 2 through the electronic components inside the electronic shelf label to provide the energy required for displaying its content. For example, the electronic components inside the electronic shelf label can be: circuit board 5.

[0035] In addition to achieving high light transmittance, the second shell 12 in the back shell 1 can also provide physical protection for the flexible perovskite solar cell 3 inside. For example, the second shell 12 can isolate the flexible perovskite solar cell 3 from the effects of dust, water vapor and slight mechanical friction, thereby extending the service life of the flexible perovskite solar cell 3.

[0036] like Figure 4 As shown, in a preferred embodiment, the receiving cavity may include a first inner cavity 14 and a second inner cavity 15 that are in communication with each other; The first inner cavity 14 may be located inside the first housing 11, and the first inner cavity 14 may be used to accommodate the circuit board 5 in the electronic price tag. For example, the circuit board 5 may be a printed circuit board.

[0037] The second inner cavity 15 can be formed by the inner wall of the second housing 12 in the rear housing 1, and the flexible perovskite solar cell 3 can be arranged around the inner wall of the second inner cavity 15. The accommodating cavity here includes a first inner cavity 14 and a second inner cavity 15, which are used to accommodate the circuit board 5 and the flexible perovskite solar cell 3, respectively. This optimizes the spatial layout, avoids mutual interference between components, improves structural compactness and assembly efficiency, and provides independent space for the flexible perovskite solar cell 3 to cover the inner wall of the second inner cavity 15.

[0038] like Figure 4As shown, in a more preferred embodiment, the second inner cavity 15 includes a first chamber 151, a second chamber 152, and a third chamber 153 that are connected together. The first chamber 151 corresponds to the area of ​​the inner wall of the left side of the second housing 12, the second chamber 152 corresponds to the area of ​​the inner wall of the upper surface of the second housing 12, and the third chamber 153 corresponds to the area of ​​the inner wall of the right side of the second housing 12. Furthermore, the three interconnected chambers can be smoothly transitioned and connected as a single unit through the arc angle at the bend. That is, the first chamber 151 and the second chamber 152, and the second chamber 152 and the third chamber 153, can be connected through an arc angle transition area.

[0039] like Figure 5 As shown, the flexible perovskite solar cell 3 includes an integrally formed first sub-cell 31, second sub-cell 32, and third sub-cell 33. The first sub-cell 31, second sub-cell 32, and third sub-cell 33 are respectively disposed on the inner walls of the first chamber 151, second chamber 152, and third chamber 153. That is, the first sub-cell 31, second sub-cell 32, and third sub-cell 33 can be respectively attached, fixed, or housed on the inner walls of the first chamber 151, second chamber 152, and third chamber 153. This design efficiently utilizes the curved space inside the second shell 12 of the electronic price tag back cover 1, maximizing the light-receiving area of ​​the flexible perovskite solar cell 3 while ensuring overall structural compactness.

[0040] In this application, the flexible perovskite solar cell 3 may further include a connecting sub-cell 34. The connecting sub-cell 34 may extend in an arc shape. Here, the connecting sub-cell 34 may be disposed in the arc-shaped region formed at the connection between the first chamber 151 and the second chamber 152, and may also be disposed in the arc-shaped region formed at the connection between the second chamber 152 and the third chamber 153. In this case, the connecting sub-cell 34 can match the contour of the arc-shaped region of the second inner cavity 15, thereby allowing the shape of the flexible perovskite solar cell 3 to match the shape of the second housing 12. This ensures that the flexible perovskite solar cell 3 can naturally conform to the inner wall of the second housing 12 during installation, preventing wrinkles, stress concentration, or peeling of the flexible perovskite solar cell 3 during installation and use.

[0041] Here, the connecting sub-cell 34 can connect the first sub-cell 34 and the second sub-cell 32, and can also connect the second sub-cell 32 and the third sub-cell 33. In this case, the flexible perovskite solar cell 3 can be an integrated bent structure composed of the first sub-cell 34, the second sub-cell 32, the third sub-cell 33, and the connecting sub-cell 34. This eliminates the need for multiple circuit connection devices to electrically connect the individual sub-cells, effectively avoiding connection point breakage or increased resistance problems caused by repeated bending or environmental stress, and greatly improving the durability and performance stability of the entire flexible perovskite solar cell 3.

[0042] In addition, the arc-shaped connector sub-cell 34 has a certain width and area, and it can also participate in photoelectric conversion, increasing the effective light-receiving area, improving the overall energy conversion efficiency, and avoiding the ineffective dead zone area that may be caused by right-angle transition.

[0043] It should be noted that the connecting sub-cell 34 is integrally formed with the first sub-cell 31, the second sub-cell 32 and the third sub-cell 33 through the same flexible substrate and thin film process, rather than being connected by post-welding or splicing.

[0044] like Figures 2-3 As shown, the electronic price tag also includes conductive foam 4. Here, there can be two conductive foams. One end of the conductive foam 4 can be electrically connected to the flexible perovskite solar cell 3, and the other end can be electrically connected to the circuit board 5. Thus, when the flexible perovskite solar cell 3 generates DC power under illumination, this power can be transmitted to the circuit board 5 through the conductive foam 4 in close contact with it. It should be noted that the flexible perovskite solar cell 3 has corresponding conductive pads integrated inside. Therefore, the electrical connection between the flexible perovskite solar cell 3 and the circuit board 5 can be achieved solely through the conductive foam.

[0045] This design fundamentally avoids the complex wiring problems encountered when distributing multiple traditional rigid solar cells on the surface of electronic price tags. It eliminates the need for additional circuit connection devices and redundant wiring required for cascading and paralleling multiple rigid battery units, greatly reducing the risk of connection failure due to too many connection points. This improves the stability and reliability of the entire power supply system. In addition, it simplifies the assembly process and further reduces circuit design costs and process complexity.

[0046] Here, the circuit board 5 in the electronic shelf label can be electrically connected to the electronic screen 2 in the electronic shelf label. It should be noted that the power supply system of the electronic shelf label provided in this application is based on the conversion of light energy to electrical energy through a flexible perovskite solar cell 3. The flexible perovskite solar cell 3 can be disposed on the inner wall of the second housing 12 to generate electrical energy under illumination. This electrical energy can be conducted through conductive foam 4. One end of the conductive foam 3 can be electrically connected to the conductive pad integrated in the flexible perovskite solar cell 3, and the other end of the conductive foam 3 can be connected to the power input terminal of the circuit board 5, thereby forming a complete power supply circuit.

[0047] Here, the circuit board 5 in the electronic price tag usually integrates a power management module. This power management module can be used to rectify, regulate, and store the electrical energy generated by the flexible perovskite solar cell 3, and distribute it to the drive circuit in the electronic screen 2 to provide the electrical energy required for the electronic screen 2 to work, so as to realize the self-powered operation of the electronic price tag.

[0048] like Figure 2 As shown, the electronic price tag may also include: transparent adhesive 13. The flexible perovskite solar cell 3 can be attached to the second housing 12 through the transparent adhesive 13. Here, the flexible perovskite solar cell 3 and the second housing 12 are attached by the transparent adhesive 13, so that the flexible perovskite solar cell 3 and the second housing 12 can be stably connected together, avoiding displacement or detachment. At the same time, it maintains high light transmittance, ensuring that light reaches the surface of the flexible perovskite solar cell 3 without obstruction. Its bonding process is simple and can improve structural stability and reliability.

[0049] In addition, the electronic price tag also includes a screen adhesive 21, through which the electronic screen 2 is detachably connected to the back cover 1. For example, the screen adhesive 21 can be one of OCA, thermosetting epoxy resin, and UV adhesive.

[0050] Furthermore, through Figure 6 The location of the flexible perovskite solar cell 3 in this utility model is further explained. The flexible perovskite solar cell 3 is surrounded by the inner wall of the second inner cavity 15. A transparent adhesive 13 is provided on the side of the flexible perovskite solar cell 3 facing the second housing 12. The side of the transparent adhesive 13 away from the flexible perovskite solar cell 3 is attached to the second housing 12.

[0051] In this application, the thickness of the flexible perovskite solar cell 3 can range from 0.1 mm to 1 mm. Thus, integrating the flexible perovskite solar cell 3 onto the back cover 1 of the electronic shelf label will hardly increase the overall thickness and weight of the electronic shelf label, allowing it to maintain a thin and compact overall shape, which aligns with the trend towards thinner and lighter electronic devices.

[0052] In addition, the flexibility of the flexible perovskite solar cell 3 gives it a certain degree of resistance to bending and impact. Compared with the more brittle rigid solar cells, it is better able to withstand minor collisions or squeezing that electronic price tags may encounter during daily use and transportation, thereby reducing the probability of damage to the flexible perovskite solar cell 3 and improving the overall durability of the electronic price tag.

[0053] Therefore, in summary, the electronic price tag of this utility model includes: a back shell 1, an electronic screen 2, and a flexible perovskite solar cell 3; the back shell includes a first shell 11 and a second shell 12 surrounding its periphery. By surrounding the flexible perovskite solar cell 3 on the inner wall of the second shell 12, the arc-shaped area of ​​the side wall and the side wall connection of the electronic price tag is fully utilized, significantly increasing the effective light-receiving area, achieving efficient absorption of ambient light from multiple angles, and significantly improving the photoelectric conversion efficiency. At the same time, it does not obstruct the front display screen, ensuring the aesthetics and display effect of the front of the electronic price tag. Its integrated bent battery structure fits perfectly with the arc-shaped area, avoiding the problem of light absorption dead angles caused by the shape limitations of traditional rigid batteries, while avoiding the complex cascaded circuits and redundant wiring of rigid batteries when they are distributed, simplifying the circuit structure and assembly process, reducing the risk of connection failure and design and manufacturing costs. In addition, the second shell is made of a light-transmitting material with a light transmittance of >90%, which can not only ensure that ambient light can efficiently penetrate to the surface of the flexible perovskite solar cell, but also form physical protection for the battery, isolating dust, moisture and slight mechanical friction, and extending the battery life.

[0054] Furthermore, the extremely thin profile of flexible perovskite solar cells adds almost no increase to the overall thickness and weight of the electronic shelf label, allowing it to maintain a slim and compact design while improving power generation capacity, aligning with the trend towards lightweight and miniaturized electronic devices. The flexibility of flexible perovskite solar cells also provides them with a degree of resistance to bending and impact. Compared to more brittle rigid solar cells, they are better able to withstand minor collisions or pressures that electronic shelf labels may encounter during daily use and transportation, reducing the probability of battery damage and improving the overall durability of the product.

[0055] A schematic diagram of the flexible perovskite solar cell 3 in this invention is shown below. Figure 7As shown, the flexible perovskite solar cell 3 may include: a flexible substrate, a first electrode layer, a hole transport layer, a perovskite layer, an electron transport layer, a second electrode layer, and an encapsulation layer.

[0056] The flexible substrate can be one of polyimide (PI) flexible substrate, polyethylene terephthalate (PET) flexible substrate, or polyethylene naphthalate (PEN) flexible substrate. The thickness of the flexible substrate can be 50 μm to 700 μm; the flexible substrate can be prepared by blade coating or plating.

[0057] In the flexible perovskite solar cell 3, the first electrode layer can be located on one side of the flexible substrate. For example, the first electrode layer can be a transparent conductive film, specifically a layered structure made of one of indium tin oxide (ITO), fluorine-doped tin oxide (FTO), and aluminum-doped zinc oxide (AZO). Here, the thickness of the first electrode layer can be 100 nm to 150 nm; the first electrode layer can be prepared using magnetron sputtering.

[0058] In the flexible perovskite solar cell 3, the hole transport layer can be located on the side of the first electrode layer away from the flexible substrate. The hole transport layer can be nickel oxide (NiO). x ), doped NiO x A layered structure is prepared using one of the following: poly(triaryl amine) (PTAA), self-assembled monolayer (SAM), or poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). Here, the thickness of the hole transport layer can be 10 nm to 20 nm; the hole transport layer can be prepared using one of the following methods: spin coating, coating, or magnetron sputtering.

[0059] In the flexible perovskite solar cell 3, the perovskite layer can be located on the side of the hole transport layer away from the flexible substrate. The material of the perovskite layer can be Cs. a FA b MA 1-a-b Pb(I x Br y Cl 1-x-y)3, namely a typical ternary cation mixed halide perovskite material. It should be noted that in this perovskite material, the A-site cation is a cesium ion (Cs). + ), formamidinium ion (FA) + ) and methylamine ions (MA + ), where FA⁺ is HC(NH2)2 + MA + CH3NH3 + The cation at the B site is a lead ion (Pb). 2+ The anion at the X position is an iodide ion (I). - ), bromide ions (Br) - ) and chloride ions (Cl - Furthermore, a, b, x, and y are all greater than or equal to 0 and less than or equal to 1; here, the thickness of the perovskite layer can be 500 nm to 800 nm; the perovskite layer can be prepared by one of spin coating, coating, or vapor deposition.

[0060] In the flexible perovskite solar cell 3, the electron transport layer can be located on the side of the perovskite layer facing away from the flexible substrate. The electron transport layer can be a fullerene (C... 60 ), tin dioxide (SnO2), [6,6]-phenyl-C 61 Methyl butyrate ([6,6]-Phenyl-C) 61 A layered structure made of one of the following: -butyric acid methyl ester (PCBM), zinc oxide (ZnO), or titanium dioxide (TiO2). Here, the thickness of the electron transport layer can be 20 nm to 60 nm; the electron transport layer can be prepared by one of the following methods: vapor deposition, spin coating, or ALD.

[0061] In the flexible perovskite solar cell 3, the second electrode layer can be located on the side of the electron transport layer away from the flexible substrate. The second electrode layer can be a layered structure made of Cu metal electrode, Ag metal electrode, Au metal electrode, or ITO composite electrode. Here, the thickness of the second electrode layer can be 80 nm to 120 nm; the second electrode layer can be prepared using one of the following methods: vapor deposition or magnetron sputtering.

[0062] In the flexible perovskite solar cell 3, the encapsulation layer can be located on the side of the second electrode layer away from the flexible substrate. It should be noted that the encapsulation layer can be a single-layer structure or a multi-layer stacked structure. The single-layer structure can be a single-layer inorganic thin-film encapsulation layer, and the multi-layer stacked structure can be a multi-layer stacked thin-film encapsulation layer composed of a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer arranged sequentially from bottom to top. The materials for the single-layer inorganic thin-film encapsulation layer are Al2O3, TiO2, ZnO, ZrO2, MgO, HfO2, Ta2O5, Si3N4, AlN, and SiN. x SiNO, SiO, SiO2, SiO x One or more of SiC and ITO. The single-layer inorganic thin film encapsulation layer can be prepared by chemical vapor deposition, plasma-enhanced chemical vapor deposition, sputtering or sublimation or a combination thereof; For a multilayer stacked thin-film encapsulation layer, both the first and second inorganic encapsulation layers are composed of oxide or nitride films; the organic encapsulation layer is made of acrylic resin, epoxy acrylic resin, or epoxy resin. Both the first and second inorganic encapsulation layers are prepared by at least one of chemical vapor deposition, plasma-enhanced chemical vapor deposition, sputtering, and sublimation; the organic encapsulation layer is a polymeric film formed by coating an ink composition onto a substrate via inkjet printing, spraying, roller coating, blade coating, or spin coating, followed by curing through heating or ultraviolet exposure.

[0063] The method for preparing the flexible perovskite solar cell in this invention is as follows: (1) Preparation of flexible substrate: 50 μm PI precursor liquid is deposited by blade coating, and then annealed at 150 °C for 60 min to solidify into a film to form a flexible substrate, i.e., flexible substrate. (2) Preparation of the first electrode layer: Using a flexible substrate as the substrate, 130 nm ITO is deposited on one side of the flexible substrate by magnetron sputtering to obtain the first electrode layer; (3) Preparation of hole transport layer: The flexible substrate coated with the first electrode layer was ultrasonically cleaned with ITO cleaning agent and deionized water in sequence, dried with nitrogen gun and treated with UV ozone for 10 min; 15 nm NiO was deposited on the side of the first electrode layer away from the flexible substrate by magnetron sputtering. x After annealing at 100 °C for 20 min, the hole transport layer can be obtained; (4) Preparation of the perovskite layer: The perovskite precursor solution (1.0 M FAPbI3) was deposited on the side of the hole transport layer away from the flexible substrate using a slot coating method. FAPbI3 is an organic-inorganic hybrid perovskite material with an ABX3 type perovskite structure. The A-site is formamidinium (FA⁺, chemical formula HC(NH2)2⁺), a monovalent organic cation. The B-site is lead (Pb). 2The perovskite layer is prepared by removing the solvent using vacuum-assisted deposition (VCD), where the vacuum level is 10 Pa and the time is 60 s. The X-position is occupied by iodine (I⁻), a halide anion. (5) Fabrication of the electron transport layer: A 40 nm thick C layer was sequentially deposited on the side of the perovskite layer away from the flexible substrate using a thermal evaporation method at a rate of 0.1 Å / s. 60 An electron transport layer can be obtained by using 6 nm of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (Bathocuproine, BCP) as a buffer layer.

[0064] (6) Preparation of the second electrode layer: Cu metal electrode is deposited on the side of the electron transport layer away from the flexible substrate by thermal evaporation. The evaporation current is 110 A. First, it is evaporated to 10 nm at a rate of 0.1 Å / s, and then 70 nm is deposited at a rate of 0.4 Å / s, with a thickness of 80 nm.

[0065] (7) Fabrication of the encapsulation layer: A 2 μm thick silicon nitride (SiN) layer is deposited on the side of the second electrode layer away from the flexible substrate using plasma-enhanced chemical vapor deposition (PECVD). x Then, an acrylic resin precursor of 10 μm was deposited by inkjet printing, cured by UV irradiation for 3 min, and finally a 2 μm SiN was deposited. x Finally, the fabrication of the flexible perovskite solar cell 3 was completed.

[0066] The efficiency test results of the flexible perovskite solar cell fabricated in this embodiment under different light intensities are shown in the figure. Figure 8 And Table 1, by Figure 8 As shown in Table 1, the photoelectric conversion efficiency of the flexible perovskite solar cells provided in the embodiments of this application is shown under illumination conditions of 200 lux to 500 lux.

[0067] Table 1. Efficiency test results of the flexible perovskite solar cells prepared in this embodiment under different light intensities.

[0068] In the table, Voc is the open-circuit voltage, Jsc is the short-circuit current density, FF is the fill factor, and PCE is the photoelectric conversion efficiency. As shown in Table 1, the flexible perovskite solar cell 3 fabricated in this embodiment achieves a photoelectric conversion efficiency of 35.67% to 36.24% under illumination conditions ranging from 200 lux to 500 lux.

[0069] Figure 9 The figure shows the bending stability test results of the flexible perovskite solar cell prepared in this embodiment. As can be seen from the figure, under dynamic bending with a curvature radius of 5 mm, the flexible perovskite solar cell 3 prepared in this embodiment still maintains more than 95% of the initial efficiency after bending 20,000 times.

[0070] To verify the structural advantages of the integrated flexible perovskite solar cell-integrated electronic shelf label of this invention, the following comparative tests were conducted: Comparative Example 1 The difference between this comparative example and Example 1 is that a rigid perovskite solar cell is provided in the frame area on the front display side of the electronic price tag.

[0071] Comparative Example 2 The difference between this comparative example and Example 1 is that a rigid perovskite solar cell is placed on the upper surface of the back cover.

[0072] Comparative Example 3 The difference between this comparative example and Example 1 is that three rigid perovskite solar cells are arranged on the left side, upper surface and right side of the rear shell 1, that is, the three rigid perovskite solar cells are arranged independently, not as a whole.

[0073] The rigid perovskite solar cells in Comparative Examples 1-3 include a rigid glass substrate, a first electrode layer, a hole transport layer, a perovskite layer, an electron transport layer, a second electrode layer, and an encapsulation layer. The only difference between the rigid perovskite solar cell and the flexible perovskite solar cell 3 is that the rigid substrate is a rigid glass substrate; the rigid substrate is a tempered glass plate with a thickness of 1.5 mm.

[0074] The circuit connection method in Comparative Example 1 is as follows: The rigid perovskite solar cell integrates two conductive pads, which are electrically connected to the circuit board through silver paste point connection, soldering and other methods. The circuit connection method in Comparative Example 2 is as follows: The rigid perovskite solar cell integrates two conductive pads, which are electrically connected to the circuit board through silver paste point connection, soldering and other methods. The circuit connection method in Comparative Example 3 is as follows: each of the three rigid perovskite solar cells integrates two conductive pads, and the six conductive pads are electrically connected to the circuit board through silver paste dotting, soldering, and other methods.

[0075] Table 2 shows a comparison of the effective light-receiving area of ​​the electronic price tag integrated with the flexible perovskite solar cell in Example 1 with that of the electronic price tags in Comparative Examples 1-3. As can be seen from Table 2, the effective light-receiving area of ​​the flexible perovskite solar cell 3 in the electronic price tag provided by this invention can reach 1776 mm². 2 This significantly increases the effective light-harvesting area, enabling the flexible perovskite solar cell 3 to receive ambient light from various angles, improving the utilization efficiency of scattered and reflected light, and allowing the flexible perovskite solar cell 3 to efficiently collect light energy under various ambient light conditions.

[0076] Table 2 compares the effective light-receiving area and electrical connection points of the electronic price tag integrated with the flexible perovskite solar cell in Example 1 with those in Comparative Examples 1-3.

[0077] In addition, Table 3 shows the comparison of the output power of the electronic price tag integrated with the flexible perovskite solar cell in Example 1 and the electronic price tags in Comparative Examples 1 to 3 under the same light intensity. As can be seen from Table 3, since the flexible perovskite solar cell 3 in Example 1 has a larger effective light-receiving area, the flexible perovskite solar cell 3 provided by this invention can capture and convert ambient light energy more efficiently under indoor light conditions of 150 lux to 1000 lux, significantly improving the output power, thereby ensuring that the electronic price tag can achieve efficient self-powering, ultra-long battery life and stable operation under indoor light conditions.

[0078] Table 3. Comparison of the output power values ​​of the electronic price tag integrated with the flexible perovskite solar cell in Example 1 with those of Comparative Examples 1-3 under the same light intensity.

[0079] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electronic shelf label integrated with an integrated flexible perovskite solar cell, characterized in that, It includes a back cover (1), an electronic screen (2), and a flexible perovskite solar cell (3). The rear shell (1) includes: a first shell (11) and a second shell (12); the second shell (12) is disposed around the periphery of the first shell (11); the first shell (11) and the second shell (12) together form a receiving cavity; The electronic screen (2) is located on one side of the first housing (11) and is detachably connected to the first housing (11); The flexible perovskite solar cell (3) is located within the receiving cavity and is arranged around the second housing (12); The flexible perovskite solar cell (3) provides power to the electronic screen (2).

2. The electronic shelf label integrated with an integrated flexible perovskite solar cell according to claim 1, characterized in that, The receiving cavity includes a first inner cavity (14) and a second inner cavity (15) that are connected to each other; the first inner cavity (14) is located inside the first housing (11) and is used to receive the circuit board (5) in the electronic price tag; the second inner cavity (15) is surrounded by the inner wall of the second housing (12) and the flexible perovskite solar cell (3) is arranged around the inner wall of the second inner cavity (15).

3. The electronic shelf label integrated with an integrated flexible perovskite solar cell according to claim 2, characterized in that, The second inner cavity (15) includes a first chamber (151), a second chamber (152), and a third chamber (153) that are connected together. The flexible perovskite solar cell (3) includes a first sub-cell (31), a second sub-cell (32), and a third sub-cell (33) integrally disposed thereon. The first sub-cell (31), the second sub-cell (32), and the third sub-cell (33) are respectively disposed on the inner walls of the first chamber (151), the second chamber (152), and the third chamber (153).

4. The electronic shelf label integrated with an integrated flexible perovskite solar cell according to claim 3, characterized in that, The flexible perovskite solar cell (3) further includes a connecting sub-cell (34), which is disposed in the arc-shaped region formed at the connection between the first chamber (151) and the second chamber (152), and the arc-shaped region formed at the connection between the second chamber (152) and the third chamber (153); the connecting sub-cell (34) is used to connect the first sub-cell (31), the second sub-cell (32) and the third sub-cell (33).

5. The electronic price tag integrated with an integrated flexible perovskite solar cell according to claim 4, characterized in that, The extension direction of the connecting sub-battery (34) is arc-shaped.

6. The electronic price tag integrated with an integrated flexible perovskite solar cell according to claim 2, characterized in that, The electronic price tag also includes: conductive foam (4), one end of which is electrically connected to the flexible perovskite solar cell (3), and the other end of which is electrically connected to the circuit board (5); The circuit board (5) is electrically connected to the electronic screen (2).

7. The electronic shelf label integrated with an integrated flexible perovskite solar cell according to claim 1, characterized in that, The second housing (12) is a housing structure made of a light-transmitting material with a light transmittance of >90%.

8. An electronic shelf label integrated with an integrated flexible perovskite solar cell according to claim 1, characterized in that, The thickness of the flexible perovskite solar cell (3) is 0.1 mm to 1 mm.

9. The electronic shelf label integrated with an integrated flexible perovskite solar cell according to claim 1, characterized in that, The electronic price tag also includes a transparent adhesive (13), through which the flexible perovskite solar cell (3) is attached to the second housing (12).

10. The electronic shelf label integrated with an integrated flexible perovskite solar cell according to claim 1, characterized in that, The electronic price tag also includes a screen adhesive (21), and the electronic screen (2) is detachably connected to the back cover (1) through the screen adhesive (21).

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