Organic photovoltaic cell module

Abstract

The utility model relates to photovoltaic cell field discloses an organic photovoltaic cell assembly, through the design and limitation of organic photovoltaic cell metal electrode layer make it when reducing material use cost guaranteed photoelectric conversion efficiency, more suitable for industrialization.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cells, specifically to an organic photovoltaic cell module. Background Technology

[0002] Compared to inorganic solar cells, organic photovoltaic cells have many advantages in photovoltaic technology, such as flexibility, thinness, adjustable spectrum, environmental friendliness, and high efficiency in low light conditions. They have broad application prospects in fields such as indoor photovoltaics, building-integrated photovoltaics, and vehicle-mounted photovoltaics.

[0003] The device structure of an organic photovoltaic cell generally includes anode, anode buffer layer, active layer, cathode buffer layer, and cathode stacked sequentially. When light passes through the transparent substrate and electrodes and enters the active layer, the donor and acceptor materials absorb photons with energy greater than their band gap. Electrons are excited from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO), and corresponding holes are generated at the HOMO. Due to the relatively low permittivity of organic materials, the electrons and holes exist in a bound exciton state at this time. Subsequently, the excitons diffuse to the donor-acceptor interface, where they dissociate under the drive of the energy level difference, achieving charge separation. Then, under the action of the built-in electric field, the free holes and electrons are transported along the continuous channels of the donor and acceptor materials to the anode and cathode, respectively, where they are collected by the electrodes and output to the external circuit to form a current.

[0004] In the fabrication of organic photovoltaic (OLED) modules, most high-efficiency OLED devices in existing technologies use the precious metal silver as their metal electrode. However, the high market price of silver significantly increases the material cost of the module. If non-precious metals, such as copper or aluminum, are used directly as the metal electrode, copper faces the problem of work function mismatch with the interface layer material when used in OLED cells. Aluminum, when prepared by vapor deposition, faces the problem of difficult-to-control vapor deposition process and easy damage to the crucible. If prepared by sputtering, when aluminum is directly sputtered onto the interface layer, it is easy to damage the interface layer, thereby degrading the device performance. Therefore, it is difficult to meet the cost and efficiency control requirements for large-scale industrial applications. Utility Model Content

[0005] This invention provides an organic photovoltaic cell module to solve the problem of cost and efficiency control that is difficult to meet for large-scale industrial applications in the prior art.

[0006] In a first aspect, this utility model provides an organic photovoltaic cell module, comprising: a substrate, and a plurality of organic photovoltaic cell units connected in series on the substrate, wherein the organic photovoltaic cell unit includes a bottom electrode layer, a functional layer, and a metal electrode layer stacked together, wherein: A substrate on which a bottom electrode layer is disposed, wherein a functional layer is formed on the side of the bottom electrode layer facing away from the substrate; A metal electrode layer is formed on the side of the functional layer opposite to the bottom electrode layer. The metal electrode layer includes a first metal layer and a second metal layer stacked together. The first metal layer is a silver electrode layer, and the second metal layer is a copper electrode layer or an aluminum electrode layer. The first metal layer is disposed between the second metal layer and the functional layer. The thickness of the first metal layer is greater than or equal to 20 nm.

[0007] In one optional embodiment, the thickness of the metal electrode layer is 80nm-500nm.

[0008] In one alternative embodiment, the thickness of the first metal layer is less than 50% of the thickness of the metal electrode layer.

[0009] In one alternative embodiment, the thickness of the first metal layer is selected from 30nm-50nm.

[0010] In one alternative embodiment, the second metal layer is an aluminum electrode layer.

[0011] In one alternative embodiment, the plurality of series-connected organic photovoltaic cell units are connected in series via a channel assembly, the channel assembly being composed of an insulating channel P1, a connecting channel P2, and a blocking channel P3.

[0012] In one alternative embodiment, the insulating channel P1 is located between the functional layer and the substrate and penetrates the bottom electrode layer, the connecting channel P2 is located between the second metal layer and the bottom electrode layer and penetrates the first metal layer and the functional layer, and the blocking channel P3 penetrates at least the metal electrode layer but does not penetrate the bottom electrode layer.

[0013] In one optional embodiment, the functional layer comprises an anode buffer layer, a photoactive layer, and a cathode buffer layer stacked thereon. Preferably, the cathode buffer layer is located between the bottom electrode layer and the photoactive layer, and the anode buffer layer is located between the first metal layer and the photoactive layer.

[0014] In one optional embodiment, the organic photovoltaic cell module includes two or more electrode extraction portions, which are integrally formed with the second metal layer and are located on the upper surface of the substrate.

[0015] In one alternative embodiment, the organic photovoltaic cell module further includes an encapsulation layer, wherein the plurality of organic photovoltaic cell units are located within a sealed space enclosed by the substrate and the encapsulation layer.

[0016] Beneficial effects: (1) The first metal layer in the metal electrode layer structure described in this application is selected from silver, which can be prepared by vapor deposition. Silver is easy to vapor deposit and has excellent performance. On the one hand, it serves as an electrode to remove charge, and on the other hand, it can play a protective role. The presence of the first metal layer allows the second metal layer to be prepared by sputtering process. The advantages of sputtering process are: ① Non-precious metals such as aluminum or copper can be prepared by sputtering process to form a dense thin film layer; ② Sputtering process can improve the utilization rate of metal materials and further reduce the cost of material use.

[0017] (2) In the metal electrode layer structure described in this application, the second metal layer plays a protective role on the one hand, preventing the device from becoming unstable due to the first metal layer being too thin; on the other hand, it plays a conductive role, used to transfer the charge extracted by the first metal layer to the outside; more importantly, it plays a cost-saving role. The value of non-precious metal aluminum or copper is less than one percent of that of precious metal silver. By using non-precious metal aluminum or copper as the second metal layer, the material cost of the metal electrode layer can be greatly reduced. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram of an organic photovoltaic cell module provided in this application; Figure 2 This is a schematic diagram of another organic photovoltaic cell module provided in this application; Figure 3 This is a schematic diagram of the structure of the inverted organic photovoltaic cell unit of this application; Figure 4 Based on the application provided in this application Figure 2 A schematic diagram of the full-surface encapsulation structure of the organic photovoltaic module described above; Explanation of reference numerals in the attached figures: 1. Substrate; 2. Functional layer; 201. Cathode buffer layer; 202. Photoactive layer; 203. Anode buffer layer; 3. Bottom electrode layer; 4. Metal electrode layer; 401. First metal layer; 402. Second metal layer; 5. Encapsulation layer; 501. Sealant layer; 502. Top cover plate; 6. Electrode removal section; P1. Insulating channel; P2. Connecting channel; P3. Isolation channel. Detailed Implementation

[0020] 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, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.

[0022] According to an embodiment of the present invention, in one aspect, an organic photovoltaic cell module is provided, comprising: a substrate 1, and a plurality of organic photovoltaic cell units connected in series on the substrate 1, wherein the organic photovoltaic cell unit includes a bottom electrode layer 3, a functional layer 2, and a metal electrode layer 4 stacked together, wherein: A substrate 1, on which a bottom electrode layer 3 is disposed, and a functional layer 2 is formed on the side of the bottom electrode layer 3 facing away from the substrate 1; A metal electrode layer 4 is formed on the side of the functional layer 2 facing away from the bottom electrode layer 3. The metal electrode layer 4 includes a first metal layer 401 and a second metal layer 402 stacked together. The first metal layer 401 is a silver electrode layer, and the second metal layer 402 is a copper electrode layer or an aluminum electrode layer. The first metal layer 401 is disposed between the second metal layer 402 and the functional layer 2. The thickness of the first metal layer 401 is greater than or equal to 20 nm.

[0023] The substrate 1 can be a glass substrate 1, a thin-film glass substrate 1, or a light-transmitting plastic substrate 1. The light-transmitting plastic substrate 1 may include a single-layer or multi-layer film, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyetheretherketone (PEEK), and polyimide (PI).

[0024] The bottom electrode layer 3 is made of a transparent or semi-transparent conductive material. Specifically, the bottom electrode layer 3 is made of a conductive metal oxide, such as indium oxide, zinc oxide, tin oxide, indium tin oxide (ITO), fluorine-doped tin oxide (FTO), gallium-doped zinc oxide (GZO), aluminum-doped zinc oxide (AZO), indium zinc oxide (IZO), or indium gallium zinc oxide (IGZO).

[0025] When the organic photovoltaic (PV) module is in operation, sunlight shines on the substrate 1. Photons pass through the bottom electrode layer 3 and are absorbed by the functional layer 2, causing electrons in the functional layer 2 to undergo excited transitions, generating electron-hole pairs as charge carriers. Under the influence of the built-in electric field, electrons and holes move towards the electrodes on both sides of the functional layer 2. One type of charge carrier, electrons or holes, moves towards the first metal layer 401 in the metal electrode layer 4, and is collected after passing through the first metal layer 401 and the second metal layer 402 in sequence. The other type of charge carrier moves towards the bottom electrode layer 3 and is collected, thus forming an output current. The silver electrode layer, which serves as the first metal layer 401, is in direct contact with the functional layer 2, ensuring efficient charge collection and interface stability. The second metal layer 402 provides additional conductive paths and mechanical support, working together to complete the charge extraction and photoelectric conversion process. By using a silver electrode layer as the first metal layer 401 of the contact functional layer 2 and a low-cost copper or aluminum electrode layer as the thick second metal layer 402, the material cost of the metal electrode layer 4 can be reduced while ensuring that the photoelectric conversion efficiency of the photovoltaic device remains at a high level. This can meet the cost control requirements for the large-scale industrial application of organic photovoltaic modules.

[0026] In this embodiment, the overall thickness of the metal electrode layer 4 is selected from 80nm-500nm to ensure that the metal electrode layer 4 has sufficient conductivity and mechanical strength.

[0027] Furthermore, the thickness of the first metal layer 401 is less than 50% of the thickness of the metal electrode layer 4.

[0028] When the metal electrode layer 4 is too thin, the electrode layer material becomes unstable, and the resistance of the metal electrode layer 4 becomes relatively high, resulting in a decrease in its photoelectric performance. However, when the metal electrode layer 4 reaches a certain thickness, the metal electrode layer 4 becomes more stable and its resistance can be further reduced, thereby achieving excellent photoelectric performance. By ensuring that the overall thickness of the metal electrode layer 4 is between 80nm and 500nm, and ensuring that the proportion of the first metal layer 401 in the overall thickness of the metal electrode layer 4 is less than 50% and its thickness is greater than or equal to 20nm, the first metal layer 401, which is made of expensive precious metals, maintains a certain thickness, ensuring that the organic photovoltaic cell module maintains a high photoelectric conversion efficiency. This allows the composite metal electrode layer 4 to replace the original silver electrode layer, thereby reducing the battery production cost.

[0029] In an alternative embodiment, the overall thickness of the metal electrode layer 4 is selected from 80 nm to 300 nm.

[0030] In an alternative embodiment, the overall thickness of the metal electrode layer 4 is selected from 90 nm to 300 nm.

[0031] In an alternative embodiment, the overall thickness of the metal electrode layer 4 is selected from 100nm-200nm.

[0032] In an alternative embodiment, the thickness of the first metal layer 401 is selected from 25nm-50nm.

[0033] In another alternative embodiment, the thickness of the first metal layer 401 is selected from 30nm-50nm.

[0034] In another alternative embodiment, the thickness of the first metal layer 401 is selected from 30nm-40nm.

[0035] In one embodiment, the second metal layer 402 is an aluminum electrode layer.

[0036] In one embodiment, the functional layer 2 includes an anode buffer layer, a photoactive layer, and a cathode buffer layer stacked sequentially.

[0037] The anode buffer layer material can be selected from PEDOT:PSS, molybdenum oxide (MoO) x ), vanadium oxide (V2O5), nickel oxide (NiO), tungsten oxide, small molecule self-assembled materials such as 2PACz, MeO-2PACz, etc., but not limited to these; The cathode buffer layer material can be selected from low work function metal complexes, metal oxides, metal salts, etc., such as 8-hydroxyquinoline metal complexes, Alq3-containing complexes, Liq-containing metal complexes, PEI-Zn, LiF, Ca, and titanium oxide (TiO2). x It can be zinc oxide (ZnO), cesium carbonate (Cs2CO3), etc.; or it can be a polymer material, such as PFN-Br or PFN or PDINN or PDINO or PNDIT-F3N-Br or PNDIT-F3N, etc.

[0038] In an optional embodiment, the organic photovoltaic cell unit is a positive device, and the organic photovoltaic cell unit includes a bottom electrode layer 3, an anode buffer layer, a photoactive layer, a cathode buffer layer, a first metal layer 401, and a second metal layer 402 stacked sequentially.

[0039] In an alternative embodiment, such as Figure 3 As shown, the organic photovoltaic cell unit is an inversion device. The cathode buffer layer 201 is located between the bottom electrode layer 3 and the photoactive layer 202, and the anode buffer layer 203 is located between the first metal layer 401 and the photoactive layer 202. Specifically, the organic photovoltaic cell unit includes a bottom electrode layer 3, a cathode buffer layer 201, a photoactive layer 202, an anode buffer layer 203, a first metal layer 401, and a second metal layer 402 stacked sequentially.

[0040] In a preferred embodiment, the organic photovoltaic cell module according to this application uses organic photovoltaic cell units selected from inversion devices. An advantage is that the anode buffer layer 203 and the first metal layer 401 can be deposited in a single vapor deposition apparatus, simplifying the module fabrication process.

[0041] In one specific embodiment, the anode buffer layer 203 is made of molybdenum trioxide.

[0042] Furthermore, the anode buffer layer 203 is made of molybdenum trioxide, the cathode buffer layer 201 is made of PEI-Zn, and the photoactive layer 202 is made of a PM6:Y6-O blend system.

[0043] like Figure 1 and Figure 2 As shown, the multiple series-connected organic photovoltaic cell units are connected in series through a channel assembly, which includes an insulating channel P1, a connecting channel P2, and a blocking channel P3.

[0044] In an alternative embodiment, such as Figure 1 As shown, the insulating channel P1 is located between the functional layer 2 and the substrate 1 and penetrates the bottom electrode layer 3; the connecting channel P2 is located between the first metal layer 401 and the bottom electrode layer 3 and penetrates the functional layer 2; and the blocking channel P3 penetrates at least the metal electrode layer 4 but cannot penetrate the bottom electrode layer 3.

[0045] In another alternative embodiment, such as Figure 2 As shown, the insulating channel P1 is located between the functional layer 2 and the substrate 1 and penetrates the bottom electrode layer 3; the connecting channel P2 is located between the second metal layer 402 and the bottom electrode layer 3 and penetrates the first metal layer 401 and the functional layer 2; and the blocking channel P3 is at least at the metal electrode layer 4 and cannot penetrate the bottom electrode layer 3.

[0046] In an alternative embodiment, the isolation channel P3 extends through the second metal layer 402, the first metal layer 401, and the functional layer 2.

[0047] The insulating channel P1 isolates the bottom electrode layer 3 of multiple organic photovoltaic cell units, making the multiple bottom electrode units disconnected and not connected to each other; the connecting channel P2 connects the bottom electrode layer 3 of one organic photovoltaic cell unit and the metal electrode layer 4 (first metal layer 401 or second metal layer 402) of another organic photovoltaic cell unit through the connecting channel P2; the isolating channel P3 isolates the metal electrode layer 4 of multiple organic photovoltaic cell units, so that two adjacent organic photovoltaic cell units can only be electrically connected through the connecting channel P2, thereby connecting multiple organic photovoltaic cell units in series.

[0048] In one embodiment, the organic photovoltaic cell module comprises n organic photovoltaic cell units, where n is selected from an integer greater than or equal to 2.

[0049] In one optional embodiment, n is selected from an integer greater than or equal to 3; in another embodiment, n is selected from an integer greater than or equal to 4; in another embodiment, n is selected from an integer greater than or equal to 5; in another embodiment, n is selected from an integer greater than or equal to 6; in another embodiment, n is selected from an integer greater than or equal to 10; in another embodiment, n is selected from an integer greater than or equal to 15; in another embodiment, n is selected from an integer greater than or equal to 20. The number of organic photovoltaic cell units in the organic photovoltaic cell module can be specifically selected according to the performance requirements of the product application.

[0050] In one embodiment, the organic photovoltaic cell module includes two or more electrode extraction portions 6, the electrode extraction portions 6 and the second metal layer 402 are integrally formed, and the electrode extraction portions 6 are located on the upper surface of the substrate 1.

[0051] The function of the electrode extraction part 6 is to conduct the current of the module through the electrode extraction part 6. When the electrode extraction part 6 is integrally formed with the metal electrode layer 4, the electrode extraction part 6 can be well attached to the upper surface of the substrate 1, thereby effectively preventing moisture and oxygen in the external environment from contacting the organic photovoltaic cell module during module encapsulation, which greatly improves the life of the module.

[0052] In this embodiment, the organic photovoltaic cell module includes two electrode extraction sections 6, which serve as the cathode and anode lead-out points, respectively.

[0053] In some other embodiments, multiple pairs of electrode extraction units 6 may be provided, and the number of electrode extraction units 6 can be adjusted according to actual needs.

[0054] like Figure 4 As shown, in one embodiment, the organic photovoltaic cell module according to this application further includes an encapsulation layer 5, and a plurality of organic photovoltaic cell units are located within a sealed space enclosed by the substrate 1 and the encapsulation layer 5.

[0055] Furthermore, the encapsulation layer 5 includes a sealant layer 501 and an upper cover plate 502; the sealant layer 501 is located between the upper cover plate 502 and the substrate 1, and the substrate 1, the sealant layer 501 and the upper cover plate 502 form a sealed space, in which multiple organic photovoltaic cell units are located.

[0056] In one embodiment, the top cover plate 502 is located on the top of the organic photovoltaic module composed of multiple organic photovoltaic cell units, and the sealant layer 501 is located on the edge of the substrate 1 and the upper surface of the electrode extraction part 6 and is attached to the periphery of the organic photovoltaic module. The substrate 1 with the bottom electrode layer 3, the sealant layer 501 and the top cover plate 502 form a sealed space to form an edge encapsulation of the organic photovoltaic module.

[0057] In another alternative embodiment, such as Figure 4 As shown, the sealant layer 501 completely covers the upper part and the surrounding edges of the organic photovoltaic module composed of multiple organic photovoltaic cell units. The upper cover plate 502 is located on the upper part of the sealant layer 501. The substrate 1, the sealant layer 501 and the upper cover plate 502 form a sealed space, forming a full-surface encapsulation of the organic photovoltaic electrode module.

[0058] It should be noted that "the four edges" refers to the inner four edges corresponding to the orthographic projection of the bonding direction between the top cover plate 502 and the substrate 1.

[0059] The sealant layer 501 can be made from sealant or a sealant film. Specifically, the sealant layer 501 can be made from silicone, butyl rubber, epoxy resin, acrylic resin, UV-curable adhesive, or AB component adhesive.

[0060] The top cover 502 can be selected from materials with excellent transparency, surface smoothness, ease of operation, and water resistance. Specifically, it can be encapsulated with glass or with flexible encapsulation, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyetheretherketone (PEEK), polyimide (PI), polyacrylate (PA), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and thermoplastic polyurethane (TPU), but is not limited to these.

[0061] The organic photovoltaic cells described in this utility model are mainly used in indoor photovoltaics, wearable devices, smart IoT, smart homes, smart agriculture, building photovoltaics, new energy vehicles and other fields.

[0062] Examples of organic photovoltaic cell module fabrication: Organic photovoltaic cell module example 1: The organic photovoltaic module area of ​​Example 1 is 2.0255 cm². 2 The number of effective cell units in the organic photovoltaic module is 5. The preparation method of the organic photovoltaic module in Example 1 includes the following steps: First, a transparent electrode ITO, serving as the bottom electrode layer 3, is fabricated on a glass substrate 1, which is the substrate 1. An insulating channel P1 is then etched on the bottom electrode layer 3 using 20 nanosecond green light. Next, a cathode buffer layer 201 and a photoactive layer 202 are sequentially fabricated using slit coating. Then, an anode buffer layer 203 and a first metal layer 401 are fabricated sequentially using a vacuum evaporation process. Finally, a connecting channel P2 is etched using a green nanosecond laser. The connecting channel P2 penetrates the first metal layer 401, the anode buffer layer 203, the photoactive layer 202, and the cathode buffer layer 201 to the bottom electrode layer 3. The cathode buffer layer 201 is made of PEI-Zn and has a thickness of approximately 30 nm. The photoactive layer 202 uses PM6 as the donor and Y6-O as the acceptor. PM6 and Y6-O are dissolved in chloroform at a mass ratio of 1:1.2 to prepare the photoactive layer 202 solution. The total concentration of PM6 and Y6-O in chloroform is 17.6 mg / mL. The thickness of the photoactive layer 202 is approximately 120 nm. The anode buffer layer 203 is made of molybdenum trioxide and has a thickness of 15 nm. The first metal layer 401 is made of Ag and has a thickness of 30 nm.

[0063] Then, the bottom electrode layer 3 and functional layer 2 (anode buffer layer 203, photoactive layer 202 and cathode buffer layer 201) 5 mm from the edge on the top and bottom sides and 10 mm from the edge on the left and right sides of the substrate 1, as well as the first metal layer 401, are removed by laser etching, thereby leaving the electrode removal part 6 and the sealing position around the substrate 1.

[0064] Subsequently, a second metal layer 402 and an electrode lead-out portion were simultaneously fabricated using vacuum sputtering. The material was selected from aluminum, and the aluminum layer thickness was 70 nm. The aluminum layer not only covered the organic photovoltaic cell unit but also the cleared edge portion around the substrate 1. A green nanolaser was used to etch the isolation channel P3 on the second metal layer 402 and the first metal layer 401, and the aluminum layer at a distance of 5 mm from the edge on both the top and bottom sides was correspondingly removed. This completed the fabrication of the organic photovoltaic cell module to be packaged and the electrode lead-out portion, with the structure as shown in the figure. Figure 2 As shown.

[0065] Finally, during the encapsulation of the organic photovoltaic cell module, the top cover plate 502 is placed on the platform. This top cover plate 502 is made of transparent glass, and its length along the series connection direction of the organic photovoltaic cell units is 2.5 mm shorter than that of the substrate 1 glass, thus exposing the lead-out electrode ends. The remaining dimensions are the same as the substrate 1. UV-curable adhesive is applied to the top cover plate 502 using a dispensing machine, with a 2 mm gap between the UV-curable adhesive and the edge of the top cover plate 502 to prevent overflow of the encapsulating adhesive during lamination. Subsequently, the organic photovoltaic cell module to be encapsulated is placed face down, aligned with the top cover plate 502, exposing the electrode extraction portion 6. A certain pressure is applied to the top cover plate 502 to tightly bond the substrate 1 and the top cover plate 502 together using UV encapsulating adhesive, at an energy of 6 J / cm². 2 Irradiation with a 365nm ultraviolet light source for 70 seconds cures the UV encapsulating adhesive, thereby obtaining the following... Figure 4 The encapsulation structure.

[0066] Organic photovoltaic cell module example 2: The preparation of the organic photovoltaic cell module in Example 2 is the same as that in Example 1, except that the thicknesses of the first metal layer 401 and the second metal layer 402 are different. The thickness of the first metal layer 401 is selected from 20 nm, and the thickness of the second metal layer 402 is selected from 80 nm.

[0067] Comparative Example 1 of Organic Photovoltaic Cell Modules: The preparation of the organic photovoltaic cell module in Comparative Example 1 is the same as that in Organic Photovoltaic Cell Module Example 1, except that the thicknesses of the first metal layer 401 and the second metal layer 402 are different. The thickness of the first metal layer 401 is selected from 15 nm, and the thickness of the second metal layer 402 is selected from 85 nm.

[0068] Comparative Example 2 of Organic Photovoltaic Cell Module: The preparation method of the organic photovoltaic cell module in Comparative Example 2 includes the following steps: First, a transparent ITO layer 3, serving as the bottom electrode layer 3, is fabricated on a glass substrate 1, which is the substrate 1. An insulating channel P1 is then etched on the bottom electrode layer using 20 nanosecond green light. Next, a cathode buffer layer 201 and a photoactive layer 202 are sequentially fabricated using slit coating. Then, an anode buffer layer 203 is fabricated using a vacuum evaporation process. Finally, a connecting channel P2 is etched using a green nanosecond laser. The connecting channel P2 penetrates the anode buffer layer 203, the photoactive layer 202, and the cathode buffer layer 201 to the bottom electrode layer 3. The anion buffer layer material is selected from PEI-Zn, with a thickness of approximately 30 nm; the donor material of the photoactive layer 202 is selected from PM6, and the acceptor material is selected from Y6-O. PM6 and Y6-O are dissolved in chloroform at a mass ratio of 1:1.2 to prepare the photoactive layer 202 solution. The total concentration of PM6 and Y6-O in chloroform is 17.6 mg / mL, and the thickness of the photoactive layer 202 is approximately 120 nm; the anolyte buffer layer 203 material is selected from molybdenum trioxide, and the thickness of the anolyte buffer layer 203 is 15 nm.

[0069] Then, the bottom electrode layer 3 and the functional layer 2, which are 5 mm away from the edge on the top and bottom sides and 10 mm away from the edge on the left and right sides of the substrate 1, are removed by laser etching, thereby leaving the electrode removal part 6 and the sealing position around the substrate 1.

[0070] Subsequently, a metal electrode layer 4 and electrode leads were simultaneously fabricated using vacuum evaporation. The material was silver, and the silver layer thickness was 100 nm. The silver layer covered not only the organic photovoltaic cell unit but also the cleared edges around the substrate 1. A green nanolaser was used to etch isolation channels P3 into the metal electrode layer 4, and the silver layer at a distance of 5 mm from the edges on both the top and bottom sides was correspondingly removed. This completed the fabrication of the organic photovoltaic cell module to be encapsulated and the electrode leads, as shown in the figure. Figure 2 As shown.

[0071] The prepared organic photovoltaic cell module was tested under indoor light. The cell current-voltage curve was tested under a 3000K LED light source (1000 lux) simulator, and the photoelectric conversion efficiency was calculated, as shown in Table 1.

[0072] Table 1

[0073] By comparing component embodiments 1 and 2 with component comparative embodiment 2, it can be seen that when the thickness of the first metal layer 401 is greater than or equal to 20 nm, the components all have a photoelectric conversion efficiency exceeding 28.5%, especially when the thickness of the first metal layer 401 is greater than or equal to 30 nm, the photoelectric conversion efficiency hardly decreases. However, when the thickness of the first metal layer 401 is selected from 15 nm, the photoelectric conversion efficiency of the device decreases significantly. Therefore, it can be seen that when the thickness of the first metal layer 401 is greater than or equal to 20 nm, the composite electrode layer of this application can replace the silver layer and achieve lower cost.

[0074] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An organic photovoltaic cell module, characterized in that, include: A substrate (1) and a plurality of organic photovoltaic cell units connected in series on the substrate (1), wherein the organic photovoltaic cell unit includes a bottom electrode layer (3), a functional layer (2) and a metal electrode layer (4) stacked together, wherein: A substrate (1) is provided thereon with a bottom electrode layer (3), and a functional layer (2) is formed on the side of the bottom electrode layer (3) facing away from the substrate (1). A metal electrode layer (4) is formed on the side of the functional layer (2) facing away from the bottom electrode layer (3). The metal electrode layer (4) includes a first metal layer (401) and a second metal layer (402) stacked together. The first metal layer (401) is a silver electrode layer, and the second metal layer (402) is a copper electrode layer or an aluminum electrode layer. The first metal layer (401) is disposed between the second metal layer (402) and the functional layer (2). The thickness of the first metal layer (401) is greater than or equal to 20 nm.

2. The organic photovoltaic cell module according to claim 1, characterized in that, The thickness of the metal electrode layer (4) is 80nm-500nm.

3. The organic photovoltaic cell module according to claim 1, characterized in that, The thickness of the first metal layer (401) is less than 50% of the overall thickness of the metal electrode layer (4).

4. The organic photovoltaic cell module according to any one of claims 1 to 3, characterized in that, The thickness of the first metal layer (401) is selected from 30nm-50nm.

5. The organic photovoltaic cell module according to any one of claims 1 to 3, characterized in that, The second metal layer (402) is an aluminum electrode layer.

6. The organic photovoltaic cell module according to any one of claims 1 to 3, characterized in that, The multiple organic photovoltaic cell units connected in series are connected in series through a channel assembly, which consists of an insulating channel (P1), a connecting channel (P2), and a blocking channel (P3).

7. The organic photovoltaic cell module according to claim 6, characterized in that, The insulating channel (P1) is located between the functional layer (2) and the transparent substrate (1) and penetrates the bottom electrode layer (3). The connecting channel (P2) is located between the second metal layer (402) and the bottom electrode layer (3) and penetrates the functional layer (2) and the first metal layer (401). The blocking channel (P3) penetrates at least the metal electrode layer (4) and does not penetrate the bottom electrode layer (3).

8. The organic photovoltaic cell module according to any one of claims 1 to 3, characterized in that, The functional layer (2) includes an anode buffer layer (203), a photoactive layer (202), and a cathode buffer layer (201) stacked together. The cathode buffer layer (201) is located between the bottom electrode layer (3) and the photoactive layer (202), and the anode buffer layer (203) is located between the first metal layer (401) and the photoactive layer (202).

9. The organic photovoltaic cell module according to any one of claims 1 to 3, characterized in that, The organic photovoltaic cell module also includes two or more electrode extraction parts (6), the electrode extraction parts (6) and the second metal layer (402) are integrally formed, and the electrode extraction parts (6) are located on the upper surface of the substrate (1).

10. The organic photovoltaic cell module according to any one of claims 1 to 3, characterized in that, It also includes an encapsulation layer (5), and the multiple organic photovoltaic cell units are located in the sealed space enclosed by the substrate (1) and the encapsulation layer (5).

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