Traceless scribing organic photovoltaic module based on inkjet filling technology and preparation method thereof

Abstract

This invention discloses a non-marking organic photovoltaic module based on inkjet filling technology and its preparation method, relating to the field of photovoltaic preparation technology. The main steps include: firstly, pre-depositing all functional layers, including a charge transport layer and a photoactive layer, on a pre-plated ITO glass substrate; then, shining a laser from the glass substrate side to sequentially perform first, second, and third markings to define and isolate the ITO electrode, functional layers, and back electrode, respectively; simultaneously filling the grooves formed after each laser marking with UV adhesive of the same color as the module using inkjet printing technology, and curing it with ultraviolet light, reducing the risk of direct damage to the functional layers from laser front processing. At the same time, the matching UV adhesive not only effectively seals the laser grooves and prevents water and oxygen intrusion, significantly improving the long-term stability and mechanical strength of the device, but also ensures the consistency of the module's appearance color, better meeting the stringent aesthetic requirements of applications such as building-integrated photovoltaics.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic manufacturing technology, specifically to a non-marking organic photovoltaic module based on inkjet filling technology and its manufacturing method. Background Technology

[0002] In the field of thin-film solar cells, perovskite solar cells (PSCs) generally use fluorine-doped tin oxide (FTO) glass as the substrate, while organic solar cells (OSCs) typically choose indium tin oxide (ITO) glass. The key reason for this choice lies in the thickness of the photoactive layer of the two types of cells and its compatibility with the physical properties of the substrate. The photoactive layer thickness of perovskite solar cells is typically between 500 and 800 nanometers. The high viscosity of the solution used in their fabrication allows for a thicker film, which can effectively cover an FTO substrate with a thickness of approximately 600 to 700 nanometers. Even if the trenches formed on the FTO substrate by laser scribing (P1) are deep, a continuous and complete thin film can still be formed.

[0003] In contrast, the photoactive layer of organic solar cells is extremely thin, typically between 100 and 200 nanometers, and its processing solution has low viscosity. If an FTO substrate is used, the deep P1 etched channels (approximately 600-700 nanometers) make it difficult for the ultrathin organic solution to cover the film uniformly, leading to breakage at the trench edges and the formation of discontinuous films. This can cause device performance issues such as internal short circuits and efficiency degradation. ITO conductive glass, on the other hand, is typically only about 150 nanometers thick, and its P1 etched channels are also shallower. This scale is more compatible with the thickness of the ultrathin functional layer in organic solar cells, facilitating uniform coating of low-viscosity solutions and forming continuous, dense films.

[0004] Furthermore, ITO glass exhibits lower surface roughness and higher surface flatness, which is crucial for ultra-thin organic functional layers, which are highly sensitive to film formation, and helps improve the consistency of device performance. In summary, due to the irreconcilable mismatch between the ultra-thin nature of the functional layer in organic solar cells and the inherent thickness of the FTO substrate and the resulting deep scribing trenches, ITO substrates possess natural advantages in terms of thickness, shallow trench depth, and surface flatness. Therefore, in the technology system of organic solar cells, ITO, rather than FTO, is typically used as the transparent conductive substrate. This invention, based on this profound technical insight, has successfully developed a high-performance organic solar cell device based on an ITO substrate.

[0005] Meanwhile, organic photovoltaic devices possess unique advantages such as light weight, flexibility, solution-processability, translucency, and the ability to be fabricated into colorful devices, demonstrating enormous application potential in fields such as building-integrated photovoltaics and wearable electronic devices. However, their commercialization process is mainly limited by two core issues: first, the devices suffer from poor long-term stability, with the active layer and electrodes being extremely sensitive to water vapor and oxygen in the environment, easily leading to rapid performance degradation; second, to achieve high voltage output, multiple sub-cells need to be integrated in series, and traditional scribing processes can easily damage the fragile functional layers, and the trenches created by scribing can become channels for water and oxygen intrusion.

[0006] Currently, mainstream tandem integration technologies, such as laser scribing, typically involve processing from the front side of the device. This method has the following drawbacks:

[0007] 1. Damage to functional layer: When the laser directly acts on the organic functional layer, the heat-affected zone is large, which can easily cause carbonization or performance degradation of the material, affecting battery efficiency.

[0008] 2. Trench Sealing Challenge: The micron-sized trenches formed after scribing lines P1, P2, and P3 are difficult to seal effectively. Conventional encapsulating adhesive layers cannot completely penetrate and fill these deep and narrow trenches, allowing water and oxygen to easily infiltrate along the trenches and corrode the internal structure. This is one of the main causes of device failure.

[0009] 3. Inconsistent appearance: The scribing grooves will expose the underlying material of different colors, resulting in obvious scribing marks of different colors on the surface of the manufactured components, which affects the aesthetics and limits its use in application scenarios where appearance is important.

[0010] Therefore, there is an urgent need in this field for an organic photovoltaic module manufacturing solution that can achieve high-precision, low-damage scribing, effectively seal the scribing grooves, and ensure the uniformity of the module's appearance. Summary of the Invention

[0011] The purpose of this invention is to provide a non-marking organic photovoltaic module based on inkjet filling technology and its preparation method, a manufacturing method that significantly improves the environmental stability and mechanical strength of organic photovoltaic devices, a method that can achieve uniform color of the module appearance, and thereby prepare high-performance, long-life, and aesthetically pleasing organic photovoltaic devices, so as to solve the problems mentioned in the background art.

[0012] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a non-marking organic photovoltaic module based on inkjet filling technology, comprising the following steps:

[0013] A light-transmitting substrate with a transparent conductive layer is provided, and a functional film layer constituting an organic photoelectric conversion unit is continuously deposited on the transparent conductive layer to form an unpatterned photoelectric conversion stack.

[0014] Perform a patterning isolation process, the patterning isolation process including:

[0015] The first etching process includes introducing a first laser beam from the side of the light-transmitting substrate away from the transparent conductive layer, ablating a portion of the transparent conductive layer to form a first isolation trench and performing a filling strategy to divide the transparent conductive layer into multiple bottom electrode units.

[0016] The second etching process includes introducing a second laser beam from the side of the light-transmitting substrate away from the transparent conductive layer to ablate part of the photoelectric conversion stack and expose part of the bottom electrode unit, forming a second connection trench; depositing a back electrode layer on the side of the photoelectric conversion stack away from the light-transmitting substrate, so that the back electrode layer forms an electrical connection with the bottom electrode unit through the second connection trench; and then performing a filling strategy into the second connection trench.

[0017] The third etching process includes introducing a third laser beam from the side of the light-transmitting substrate away from the transparent conductive layer to ablate part of the back electrode layer and the photoelectric conversion stack to form a third isolation trench and perform a filling strategy to achieve series isolation of adjacent photoelectric conversion units.

[0018] The filling strategy includes depositing a curable sealing medium into the isolation trench and curing the curable sealing medium to form an insulating sealing structure with surface optical characteristics that match the substance of the photoelectric conversion stack.

[0019] Preferably, the third etching process further includes etching at least two protective line trenches with differentiated etching isolation in the edge region of the photoelectric conversion unit, while performing the filling strategy.

[0020] Preferably, the process also includes a fourth etching process and packaging testing. The fourth etching process includes using a laser to clean the edges of the organic photovoltaic module to completely remove the back electrode layer and the transparent conductive layer located at the outer edge.

[0021] Preferably, the photoelectric conversion stack includes at least a first charge transport layer, an organic photoactive layer, and a second charge transport layer, starting from the side closest to the transparent conductive layer.

[0022] Preferably, the first charge transport layer is selected from one or more of the following: organic small molecule triphenylamine derivatives or carbazole materials, polymer PEDOT:PSS, polyphosphoric carbazole polymer materials Poly-2PACz, inorganic metal oxides MoOx, VOx, and NiOx, with a film thickness of 10-20 nm.

[0023] Preferably, the organic photoactive layer includes a donor material and an acceptor material, wherein the donor material is selected from at least one of PM6, D18, PTQ10 or PCE10; and the acceptor material is selected from at least one of Y6, N3, Y6-BO, BTP-eC9, L8-BO or fullerene and its derivatives, and the film thickness is 100-200 nm.

[0024] Preferably, the second charge transport layer is selected from one or more of the following: fullerenes and their derivatives, perylene imide derivatives, N-type conjugated polymers or N-type non-conjugated polymers and inorganic N-type metal oxides, and the film thickness is 10-20 nm.

[0025] Preferably, the curable sealing medium includes a UV-curable adhesive with a preset color ratio, wherein the base resin of the UV-curable adhesive is selected from at least one of polyurethane acrylate, epoxy acrylate or silicone-modified acrylate, and the insulating sealing structure formed after curing has a permeability of less than 1×10-3 g / (m²·day) to both water vapor and oxygen.

[0026] Preferably, the filling strategy employs inkjet printing technology, with an inkjet printing precision of 10-50 μm, a piezoelectric inkjet printhead, and a UV-curable adhesive viscosity of 10-1000 cP.

[0027] Preferably, the back electrode material is selected from one or more of metal electrodes (Au, Ag, Cu), transparent conductive oxide (ITO), and their composite electrodes; preferably, the film thickness is 50-100 nm.

[0028] Preferably, the laser beam is a picosecond laser or a nanosecond laser, with a laser wavelength of 355nm, 532nm or 1064nm, a laser energy density of 0.1-5 J / cm², a pulse frequency of 1-500 kHz, and a scribing speed of 300-500mm / s.

[0029] Preferably, the curing process involves controlling the UV light source to turn on 0.1-2 seconds after the inkjet printhead has completed filling a groove segment, and then irradiating for 1-10 seconds. The UV light source is an LED surface light source with an emission wavelength of 365nm or 385nm, and the light intensity at the substrate is not less than 100 mW / cm². 2 .

[0030] Furthermore, the present invention also provides a non-marking organic photovoltaic module based on inkjet filling technology, comprising:

[0031] A light-transmitting substrate and a transparent conductive layer disposed thereon, wherein the transparent conductive layer is divided into multiple bottom electrode units by a first isolation trench filled with a cured sealing medium;

[0032] A photoelectric conversion stack is continuously covered on the transparent conductive layer;

[0033] The back electrode layer is disposed on the photoelectric conversion stack and is divided into multiple top electrode units by a third isolation trench filled with a cured sealing medium.

[0034] The back electrode layer passes through the second connecting trench in the photoelectric conversion stack and is electrically connected to the adjacent bottom electrode unit, and the upper recess of the second connecting trench is filled with the curing sealing medium.

[0035] The cured sealing medium filling all the trenches and the photoelectric conversion stack exhibit the same color and gloss within the visual range.

[0036] In summary, the beneficial effects of this invention are:

[0037] 1. Extremely high device stability: By pre-depositing functional layers and then performing laser scribing and UV adhesive filling, the sealing problem at the groove is completely solved, the device's resistance to water and oxygen corrosion is significantly improved, and its service life is significantly extended.

[0038] 2. Higher manufacturing yield and efficiency: Pre-depositing the functional layer before laser scribing reduces damage to the functional layer, improving scribing accuracy and process reliability. Inkjet printing filling enables rapid, localized, and selective processing, suitable for large-scale roll-to-roll or sheet-to-sheet production.

[0039] 3. Excellent mechanical properties: The three-dimensional network structure formed after UV adhesive curing firmly binds the entire device together, improving the flexibility and fatigue resistance of the component.

[0040] 4. Superior aesthetic value: It achieves color uniformity in the appearance of the components, meets the stringent aesthetic requirements of high-end applications such as building-integrated photovoltaics, and expands the application scenarios of organic photovoltaics.

[0041] 5. Simple process and strong compatibility: This method is highly compatible with existing organic photovoltaic device fabrication processes. It only requires the addition of inkjet printing and UV curing steps, making it easy to upgrade existing production lines. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the process framework of a method for preparing a non-marking scribing organic photovoltaic module based on inkjet filling technology according to the present invention.

[0044] Figure 2 This is a schematic diagram of the process structure of a method for preparing a non-marking organic photovoltaic module based on inkjet filling technology according to the present invention.

[0045] Figure 3 This is a schematic diagram illustrating the traditional preparation of the underlined area in the preparation method of the traceless scribing organic photovoltaic module based on inkjet filling technology of the present invention.

[0046] Figure 4 This is a schematic diagram showing the scribing area of ​​an organic photovoltaic module, which is a method for preparing a scribing organic photovoltaic module based on inkjet filling technology according to the present invention.

[0047] Figure 5 This is a schematic diagram illustrating an organic photovoltaic module prepared according to the present invention, which is based on an inkjet filling technology for the fabrication of a non-marking organic photovoltaic module. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0049] To facilitate understanding of the present invention, a more complete description of the invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be more thorough and complete.

[0050] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0051] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of at least two elements or the interaction relationship of at least two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] Please see Figures 1-5 The present invention provides an embodiment of a method for preparing a non-marking organic photovoltaic module based on inkjet filling technology, wherein the core is the combination of "pre-depositing a functional layer and then performing laser marking" and "inkjet printing colored adhesive for filling", and the specific steps are as follows:

[0054] S1: Provide a glass substrate with a transparent conductive oxide ITO layer of about 150nm thick deposited on its front side, cleaned and dried;

[0055] S2: Deposition of functional layers. Without scribing, charge transport layer one, photoactive layer, and charge transport layer two are sequentially deposited using a slot coating method to form a complete organic photovoltaic functional layer stack. (Reference) Figure 2 Sub-image a in the image shows a coating without scribing lines.

[0056] S3: Perform P1 scribing: Using a picosecond laser with a wavelength of 1064nm, incident from the back of the glass substrate, and focused on the interface between the transparent conductive oxide (ITO) layer and the glass substrate, a portion of the ITO layer is removed. Laser parameters are set as follows: energy density 0.8 J / cm², pulse frequency 50 kHz, and scanning speed 500 mm / s. Scribing is performed to form P1 trenches approximately 30 μm wide and 170 nm deep, isolating the ITO layer into multiple parallel stripes, defining the sub-cell boundaries, and isolating the transparent conductive oxide (ITO) layer into multiple independent units. (Reference) Figure 2 Draw a line on subgraph b, P1;

[0057] S4: Filling the P1 trench. Using inkjet printing technology and an industrial piezoelectric inkjet printhead, pre-mixed UV adhesive is precisely printed and filled into the P1 trench. The UV adhesive base material is epoxy acrylate, and its color matches the dark blue functional layer. The adhesive viscosity is 150 cP. After filling, it is irradiated with a 365nm wavelength, 50 mW / cm² UV lamp for 5 seconds to fully cure the UV adhesive. (The text then repeats the process of filling the P1 trench with insulating UV adhesive and curing it with UV light.) Figure 2 Sub-image c in the image, inkjet printing of the P1 groove;

[0058] S5: Perform P2 scribing: Using a 532nm picosecond laser and the same laser system, the laser is incident from the back of the glass substrate and focused on the interface between the functional layer and the transparent conductive oxide (ITO) layer. A portion of the functional layer is removed, and scribing is performed at a slightly lower energy density (0.6 J / cm²) to form P2 trenches, exposing the bottom electrode. This allows the subsequently deposited back electrode to contact the ITO, achieving series connection of the sub-cells. (Reference) Figure 2 Draw a line on subgraph d, P2;

[0059] S6: Deposit a back electrode layer on the functional layer. A silver layer approximately 100 nm thick is deposited on the functional layer as the back electrode via thermal evaporation. (Reference) Figure 2 Sub-figure e in the image shows the electrode plating process.

[0060] S7: Using inkjet printing technology, UV adhesive is filled into the P2 groove and cured by ultraviolet light irradiation. (Refer to...) Figure 2 Sub-image f in the image, inkjet printing of the P2 groove;

[0061] S8: Perform P3 scribing: Using a picosecond laser with a wavelength of 532nm, the same laser system is used again to strike the back of the glass substrate from the back, focusing on the interface between the back electrode layer and the functional layer. Scribing is performed at an energy density of 1.0 J / cm², removing a portion of the back electrode layer and functional layer to form a P3 trench. This isolates the back electrode layer and enables the series connection of adjacent battery cells. (Refer to...) Figure 2 In the sub-figure g, P3 is drawn, and at the same time, two protective lines with differentiated etching isolation are drawn on the edge of the battery, which are used as protective lines for subsequent edge cleaning processing P4.

[0062] S9: Using inkjet printing technology, UV adhesive is filled into the grooves of P3 and the isolation protection line, and then cured by ultraviolet light irradiation. (Refer to...) Figure 2 Sub-image h in the image, inkjet printing of the P3 groove.

[0063] S10: Perform P4 scribing: Use a picosecond laser with a wavelength of 1064nm to clean the edges of the battery, completely removing the edge back electrode layer and ITO layer.

[0064] S11: The battery is encapsulated and tested. A high-barrier encapsulation film is covered on the entire surface of the device and laminated to complete the device manufacturing.

[0065] It should be noted that, in this embodiment, the charge transport layer is selected from one or more of the following: organic small molecule triphenylamine derivatives or carbazole materials, polymer PEDOT:PSS, polyphosphoric carbazole polymer materials Poly-2PACz, inorganic metal oxides MoOx, VOx, and NiOx, and the film thickness is 15nm.

[0066] The photoactive layer also includes a donor material and an acceptor material. The donor material is selected from PM6, D18, PTQ10 and / or PCE10, and the acceptor material is selected from Y6, N3, Y6-BO, BTP-eC9, fullerene and its derivatives and / or L8-BO. ​​The film thickness is 150 nm.

[0067] The charge transport layer 2 is selected from one or more of the following organic small molecule materials: fullerene and its derivatives, perylene imide derivatives, N-type conjugated polymers or N-type non-conjugated polymers and inorganic N-type metal oxides, with a film thickness of 15 nm.

[0068] It should also be noted that, in this embodiment, the permeability of the UV adhesive to water vapor and oxygen after curing is less than 1×10⁻⁶. -3 g / (m 2 ·day).

[0069] It is worth mentioning that during the UV colloid curing process, the UV light source is turned on 0.1-2 seconds after the inkjet printhead completes filling of one groove segment, and then irradiates for 1-10 seconds. The UV light source is an LED surface light source with an emission wavelength of 365nm or 385nm, and the light intensity at the substrate is not less than 100 mW / cm². 2 .

[0070] Furthermore, the present invention also provides a non-marking organic photovoltaic module based on inkjet filling technology, comprising:

[0071] A light-transmitting substrate and a transparent conductive layer disposed thereon, wherein the transparent conductive layer is divided into multiple bottom electrode units by a first isolation trench filled with a cured sealing medium;

[0072] A photoelectric conversion stack is continuously covered on the transparent conductive layer;

[0073] The back electrode layer is disposed on the photoelectric conversion stack and is divided into multiple top electrode units by a third isolation trench filled with a cured sealing medium.

[0074] The back electrode layer passes through the second connecting trench in the photoelectric conversion stack and is electrically connected to the adjacent bottom electrode unit, and the upper recess of the second connecting trench is filled with the curing sealing medium.

[0075] The cured sealing medium filling all the trenches and the photoelectric conversion stack exhibit the same color and gloss within the visual range.

[0076] 1. Pre-deposit functional layers before laser scribing:

[0077] Unlike traditional laser scribing performed from the front side (functional layer side) of the device, this invention innovatively employs a "pre-deposit functional layer followed by laser scribing" method. Specifically, charge transport layer one, active layer, and charge transport layer two are deposited sequentially on ITO, and then laser scribing is performed on each layer in turn. Furthermore, the laser beam always enters from the glass substrate side, allowing for effective focusing and precise application of laser energy to the target layer interfaces (such as the ITO / glass interface or the functional layer / ITO interface), achieving "cold processing." The heat-affected zone is confined to a very small area, avoiding thermal and mechanical damage to the upper organic functional material caused by front-side processing.

[0078] 2. Inkjet printing with colored UV adhesive filling:

[0079] After each laser scribing (P1, P2, P3), high-precision inkjet printing technology is immediately and simultaneously used to precisely fill the corresponding trenches with UV adhesive of the same color as the component, followed by UV curing. Inkjet printing is a non-contact, digital additive manufacturing technology that can precisely spray UV adhesive into micron-level trenches in droplet form, achieving complete filling without bubbles or voids. The cured UV adhesive forms a dense insulating seal, fundamentally cutting off the path of water and oxygen intrusion along the trenches, greatly improving the barrier performance of the device. The filled UV adhesive physically reconnects the previously separated battery cells, enhancing the overall structural integrity of the component and its mechanical properties such as bending and impact resistance. Aesthetic consistency is a key innovation of this invention. Because the UV adhesive is similar in color to or the same as the organic photovoltaic functional layer, the filled trenches can be visually "invisible."

[0080] In this way, the final component surface has a uniform color, without any discolored lines or marks, which can be compared. Figure 3 and Figure 4 This greatly enhances the product's appearance quality and value, among which... Figure 3 The comparison device was prepared using a traditional front-side laser scribing process. After scribing, no UV adhesive was used for filling; instead, conventional encapsulating adhesive was used for overall encapsulation, resulting in the scribing.

[0081] The above description is merely a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Any variations or substitutions conceived without inventive effort should be included within the scope of protection of the invention. Therefore, the scope of protection of the invention should be determined by the scope defined in the claims.

Claims

1. A method for preparing a non-marking scribing organic photovoltaic module based on inkjet filling technology, characterized in that: Includes the following steps: A light-transmitting substrate with a transparent conductive layer is provided, and a functional film layer constituting an organic photoelectric conversion unit is continuously deposited on the transparent conductive layer to form an unpatterned photoelectric conversion stack. Perform a patterning isolation process, the patterning isolation process including: The first etching process includes introducing a first laser beam from the side of the light-transmitting substrate away from the transparent conductive layer, ablating a portion of the transparent conductive layer to form a first isolation trench and performing a filling strategy to divide the transparent conductive layer into multiple bottom electrode units. The second etching process includes introducing a second laser beam from the side of the light-transmitting substrate away from the transparent conductive layer to ablate part of the photoelectric conversion stack and expose part of the bottom electrode unit, forming a second connection trench; depositing a back electrode layer on the side of the photoelectric conversion stack away from the light-transmitting substrate, so that the back electrode layer forms an electrical connection with the bottom electrode unit through the second connection trench; and then performing a filling strategy into the second connection trench. The third etching process includes introducing a third laser beam from the side of the light-transmitting substrate away from the transparent conductive layer to ablate part of the back electrode layer and the photoelectric conversion stack to form a third isolation trench and perform a filling strategy to achieve series isolation of adjacent photoelectric conversion units. The filling strategy includes depositing a curable sealing medium into the isolation trench and curing the curable sealing medium to form an insulating sealing structure with surface optical characteristics that match the substance of the photoelectric conversion stack.

2. The method for preparing a non-marking organic photovoltaic module based on inkjet filling technology according to claim 1, characterized in that: The third etching process also includes etching at least two protective line trenches with differentiated etching isolation in the edge region of the photoelectric conversion unit, while performing the filling strategy.

3. The method for preparing a non-marking organic photovoltaic module based on inkjet filling technology according to claim 2, characterized in that: It also includes a fourth etching process and packaging test. The fourth etching process includes using a laser to clean the edges of the organic photovoltaic module to completely remove the back electrode layer and the transparent conductive layer located at the outer edge.

4. The method for preparing a non-marking organic photovoltaic module based on inkjet filling technology according to claim 1, characterized in that: The photoelectric conversion stack, starting from the side closest to the transparent conductive layer, sequentially includes at least a first charge transport layer, an organic photoactive layer, and a second charge transport layer.

5. The method for preparing a non-marking organic photovoltaic module based on inkjet filling technology according to claim 4, characterized in that: The first charge transport layer is selected from one or more of the following: organic small molecule triphenylamine derivatives or carbazole materials, polymer PEDOT:PSS, polyphosphoric carbazole polymer materials Poly-2PACz, and inorganic metal oxides MoOx, VOx, and NiOx.

6. The method for preparing a non-marking organic photovoltaic module based on inkjet filling technology according to claim 4, characterized in that: The organic photoactive layer includes a donor material and an acceptor material. The donor material is selected from at least one of PM6, D18, PTQ10 or PCE10. The acceptor material is selected from at least one of Y6, N3, Y6-BO, BTP-eC9, L8-BO or fullerene and its derivatives.

7. The method for preparing a non-marking organic photovoltaic module based on inkjet filling technology according to claim 4, characterized in that: The second charge transport layer is selected from one or more of the following: fullerenes and their derivatives, perylene imide derivatives, N-type conjugated polymers or N-type non-conjugated polymers, and inorganic N-type metal oxides.

8. The method for preparing a non-marking organic photovoltaic module based on inkjet filling technology according to claim 1, characterized in that: The curable sealing medium includes a UV-curable adhesive with a preset color ratio. The base resin of the UV-curable adhesive is selected from at least one of polyurethane acrylate, epoxy acrylate, or silicone-modified acrylate, and the insulating sealing structure formed after curing has a water vapor and oxygen permeability of less than 1×10⁻⁶. -3 g / (m²·day).

9. The method for preparing a non-marking organic photovoltaic module based on inkjet filling technology according to claim 1, characterized in that: The filling strategy employs inkjet printing technology for filling, with an inkjet printing precision of 10-50μm, a piezoelectric inkjet printhead, and an ultraviolet-curable adhesive viscosity of 10-1000cP.

10. A non-marking organic photovoltaic module based on inkjet filling technology, characterized in that: Manufactured using the preparation method according to any one of claims 1-9, comprising: A light-transmitting substrate and a transparent conductive layer disposed thereon, wherein the transparent conductive layer is divided into multiple bottom electrode units by a first isolation trench filled with a cured sealing medium; A photoelectric conversion stack is continuously covered on the transparent conductive layer; The back electrode layer is disposed on the photoelectric conversion stack and is divided into multiple top electrode units by a third isolation trench filled with a cured sealing medium. The back electrode layer passes through the second connecting trench in the photoelectric conversion stack and is electrically connected to the adjacent bottom electrode unit, and the upper recess of the second connecting trench is filled with the curing sealing medium. The cured sealing medium filling all the trenches and the photoelectric conversion stack exhibit the same color and gloss within the visual range.

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