Fibrous organic solar cells, methods of making and using the same

Abstract

The application provides a fibrous organic solar cell, a preparation method and application thereof. The preparation method comprises the following steps: providing a fiber substrate and a flexible solar cell precursor, the flexible solar cell precursor comprising a substrate layer, a modification layer, a base layer and a functional layer stack which are sequentially stacked; the functional layer stack has a stacked structure of an organic solar cell device; at least the functional layer stack, the base layer and part of the modification layer are wound on the surface of the fiber substrate as a winding layer with the functional layer stack on the inner side, so as to obtain the fibrous organic solar cell. The application realizes the decoupling of the base layer and the substrate layer of the organic solar cell by the modification layer, avoids the damage of the functional layer stack caused by the bending and stress in the peeling or winding process, realizes the one-dimensional structure form of the organic solar cell by constructing the device structure in the form of a winding layer on the surface of the fiber substrate, and has better bending and weaving adaptability.

Description

Technical Field

[0001] This invention belongs to the field of solar cell technology, specifically relating to a fibrous organic solar cell, its preparation method, and its application. Background Technology

[0002] With the rapid development of wearable electronics, flexible display technology, and smart weaving technology, new energy devices capable of stable operation under bending, stretching, and weaving conditions have become a research and application hotspot. Fibrous energy devices, due to their excellent flexibility and weavability, are considered a key component for realizing smart fabrics and wearable systems. Organic solar cells, with their advantages of high material flexibility, low-temperature fabrication, light weight, and potential biocompatibility, show promising application prospects in the field of flexible and wearable energy.

[0003] Building on this, in order to meet the application requirements of fabrication, wearables and other applications, existing research has proposed to further develop organic solar cells from planar structures to fibrous structures. This involves sequentially constructing an electrode layer, a transport layer and an organic active layer on the surface of a fiber or linear substrate, or transferring and coating a pre-prepared flexible thin-film battery onto the surface of a fiber substrate to form a fibrous organic solar cell.

[0004] However, existing fiber-based solar cell fabrication methods typically suffer from complex processes, difficulty in controlling the uniformity of functional layer deposition, and insufficient stability of devices under conditions of small curvature bending or repeated deformation. Furthermore, when fabricating organic solar cells using ultrathin flexible substrates, the interfacial bonding between the substrate and the temporary support substrate is strong, making the peeling and winding process onto the fiber substrate difficult, thus limiting the further development of ultra-flexible organic solar cells in the direction of fiber integration. In addition, current fiber-based solar cells based on coaxial technology can only achieve one solar cell per fiber, exhibiting low voltage characteristics. In practical applications, multiple fibers need to be connected in series to meet the actual voltage requirements. Summary of the Invention

[0005] The main objective of this invention is to provide a fibrous organic solar cell, its preparation method, and its application, in order to overcome the shortcomings of the prior art.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a fibrous organic solar cell, which includes a fibrous substrate and a winding layer, wherein the winding layer is wrapped around the surface of the fibrous substrate in a winding manner. Along the radial direction and pointing toward the fiber substrate, the wound layer includes at least a modification layer, a base layer and a functional stack in sequence, wherein the modification layer and the base layer are both transparent materials, the base layer is made of a flexible polymer, and the functional stack has a stacked structure of an organic solar cell device.

[0007] Secondly, the present invention also provides a method for preparing a fibrous organic solar cell, comprising: A fiber substrate and a flexible solar cell precursor are provided. The flexible solar cell precursor includes a substrate layer, a modification layer, a base layer, and a functional stack layer stacked sequentially. The substrate layer and the base layer are both made of flexible polymers, and the thickness of the base layer is less than 10 μm. The base layer and the substrate layer are peelable, and after peeling, at least a portion of the modification layer is attached to the base layer. The functional stack layer has a stacked structure of an organic solar cell device. By winding at least the functional stack, the substrate layer, and a portion of the modification layer as winding layers around the surface of the fiber matrix with the functional stack on the inside, a fibrous organic solar cell is obtained.

[0008] Thirdly, the present invention also provides the application of the above-mentioned fiber organic solar cell in the field of photovoltaic power generation, the application including using the fiber organic solar cell alone or weaving it into a fabric structure for receiving light and outputting electrical energy in wearable electronic devices or flexible energy systems.

[0009] Compared with the prior art, the beneficial effects of the present invention include at least the following: The fibrous organic solar cell and its fabrication method provided by this invention utilize a modification layer to decouple the substrate layer and the base layer of the organic solar cell, avoiding damage to the functional stack caused by bending and stress during peeling or winding. By constructing the device structure on the surface of the fiber substrate in the form of a winding layer, a one-dimensional structure of the organic solar cell is realized, which has better bending and weaving adaptability.

[0010] This project has discovered that a single fiber in a fiber battery is composed of modules, and the voltage can be designed by connecting different numbers of modules in series to obtain different voltages, thus meeting the needs of practical applications.

[0011] The above description is merely an overview of the technical solution of the present invention. In order to enable those skilled in the art to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described below in conjunction with detailed drawings. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application 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 recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the fabrication process of a fibrous organic solar cell provided in a typical embodiment of the present invention; Figure 2 This is a photograph of a fibrous organic solar cell provided in a typical embodiment of the present invention. Figure 3 This is a comparative test chart of the performance curves of a fibrous organic solar cell before and after curling, provided in a typical embodiment of the present invention. Figure 4 These are substrate transmittance test diagrams of fibrous organic solar cells with different modification layers provided in several typical embodiments of the present invention; Figure 5 This is a photograph of the woven state of a fibrous organic solar cell provided in a typical embodiment of the present invention. Detailed Implementation

[0014] In existing technologies, fiber solar cells are typically constructed by directly building the cell structure on the surface of a fiber substrate. This mainly includes several approaches, such as sequentially depositing an electrode layer, a carrier transport layer, and a photoactive layer on the surface of conductive fibers to form a coaxial or multilayer coated structure; using processes such as coating, spraying, dip coating, or electrochemical deposition to construct photoelectric conversion device structures layer by layer on the fiber surface; and directly depositing or coating functional materials on the fiber surface to form photoelectric device structures.

[0015] However, the above methods all require the direct deposition of multilayer functional materials on the surface of curved or cylindrical fibers, which places high demands on the preparation process and equipment. At the same time, due to the small diameter and large surface curvature of the fiber substrate, it is difficult to achieve a uniform and continuous functional layer on the fiber surface, which can easily lead to uneven device structure or unstable performance. Furthermore, when constructing multilayer device structures, problems such as interface defects and weak interface bonding are prone to occur, which will affect the photoelectric conversion efficiency and stability of the device, and will also cause the device performance to gradually decline under bending, winding and repeated deformation conditions.

[0016] In addition, in some existing technologies, although fibrous organic solar cells can be formed by wrapping ultra-flexible organic solar cell modules on the surface of a fiber matrix in a winding manner, ultra-flexible organic solar cell modules usually need to be attached to a temporary support substrate (usually referred to as a substrate layer) for fabrication. The peeling and fiber integration process has high requirements for operating conditions, and slight improper operation may introduce mechanical damage, further limiting the stable fabrication and practical application of the device. Even if peeling is carried out and the substrate layer is wound together, the functional stack of the organic solar cell can also be easily damaged due to changes in curvature.

[0017] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The following will further explain and illustrate this technical solution, its implementation process, and its principles.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0019] To address the core challenges of existing technologies, such as the difficulty of directly depositing films on fiber surfaces, insufficient interfacial stability, and easy damage during the integration of ultra-flexible devices, this invention proposes a fiber organic solar cell, its preparation method, and its application. By optimizing the structural design and preparation process, the complex process of directly depositing multilayer functional materials on high-curvature fiber surfaces is avoided, improving the stability and consistency of the device structure during fiberization. This results in a reliable fiber organic solar cell suitable for practical use, overcoming the shortcomings of existing technologies in terms of film uniformity, interfacial adhesion, and mechanical stability.

[0020] Based on the above objectives, the present invention first provides a fibrous organic solar cell, which includes a fibrous substrate and a winding layer. The winding layer is wrapped around the surface of the fibrous substrate in a winding manner and is radially directed toward the fibrous substrate. The winding layer includes at least a modification layer, a base layer and a functional stack in sequence. The modification layer and the base layer are both transparent materials. The base layer is made of a flexible polymer. The functional stack has a stacked structure of an organic solar cell device.

[0021] In some embodiments, the fibrous organic solar cell is in a bent, wound, or woven state.

[0022] In some embodiments, the material of the modification layer includes any one or a combination of two or more of fluorinated polymers, silane compounds, and polysilazane.

[0023] In some implementations, the thickness of the modification layer is 50-200 nm.

[0024] In some embodiments, the fluorinated polymer includes any one or a combination of two or more of polytetrafluoroethylene, perfluoroalkoxyalkane, fluorinated ethylene-propylene copolymer, and ethylene-tetrafluoroethylene copolymer.

[0025] In some embodiments, the silane compound includes any one or a combination of two or more of dodecyltrichlorosilane, hexadecyltrichlorosilane, octadecyltrichlorosilane, perfluorodecyltrichlorosilane, perfluorooctyltrichlorosilane, perfluorodecyltrimethoxysilane, and octadecyltrimethoxysilane.

[0026] In some embodiments, the polysilazane comprises perhydropolysilazane.

[0027] In some embodiments, the flexible polymer includes any one or a combination of two or more of parylene, polyethylene naphthalate, and polyimide.

[0028] In some implementations, the thickness of the substrate layer is 1-3 μm.

[0029] In some implementations, the thickness of the substrate layer is 50-200 μm.

[0030] In some embodiments, the functional stack, directed radially toward the fiber substrate, sequentially comprises a bottom electrode layer, a first semiconductor transport layer, an organic functional layer, a second semiconductor transport layer, and a top electrode layer.

[0031] In some embodiments, the bottom electrode layer is made of any one or a combination of two or more of metal nanowires, conductive polymers, or metal films.

[0032] In some implementations, the bottom electrode layer is a continuous electrode structure.

[0033] In some embodiments, the first semiconductor transport layer and the second semiconductor transport layer are selected from an electron transport layer and a hole transport layer, respectively; the material of the electron transport layer includes any one or a combination of two or more of zinc oxide, sol-gel zinc oxide, and PEI-modified zinc oxide; the material of the hole transport layer includes any one or a combination of two or more of molybdenum oxide, nickel oxide, and tungsten oxide.

[0034] In some embodiments, the organic functional layer includes an organic donor material and an organic acceptor material; the organic donor material includes any one or a combination of two or more of PM6, PTB7-Th, and PBDB-T; the organic acceptor material includes any one or a combination of two or more of PCBM, L8-BO, BTP-BO-4Cl, and BTP-eC9.

[0035] In some embodiments, the material of the top electrode layer includes any one or a combination of two or more of Al, Ag, and Au.

[0036] See Figure 1 As shown in the figure, this invention also provides a method for preparing a fibrous organic solar cell, which includes the following steps: A fiber substrate and a flexible solar cell precursor are provided. The flexible solar cell precursor includes a substrate layer, a modification layer, a base layer, and a functional stack layer stacked sequentially. The substrate layer and the base layer are both made of flexible polymers, and the thickness of the base layer is less than 10 μm. The base layer and the substrate layer are peelable, and after peeling, at least a portion of the modification layer is attached to the base layer. The functional stack layer has a stacked structure of an organic solar cell device. By winding at least the functional stack, the substrate layer, and a portion of the modification layer as winding layers around the surface of the fiber matrix with the functional stack on the inside, a fibrous organic solar cell is obtained.

[0037] In some embodiments, the preparation method specifically includes the following steps: The substrate layer and the base layer are peeled off, and then a portion of the functional stack, the base layer and a portion of the modification layer are wound as winding layers and wound around the surface of the fiber matrix. Alternatively, the substrate layer, the modification layer, the base layer, and the functional stack can be wound together, and then the substrate layer can be peeled off from the base layer.

[0038] In a typical embodiment of the present invention, a flexible substrate layer is first provided, which may be any one or a combination of two or more of the flexible polymers including parylene, polyethylene naphthalate, and polyimide, with its thickness controlled within a suitable range to maintain flexibility. On the surface of the substrate layer, a modification layer for decoupling the substrate layer and the base layer is formed by physical or chemical means. The material of the modification layer is, for example, some fluorinated polymers, silane compounds, or polysilazane (the selection of the modification layer is important to balance peelability and adhesion performance), which has a certain degree of adhesion but does not completely bond the substrate layer and the base layer together too firmly. Then, on the surface of the modification layer, a base layer, also made of a flexible polymer, is formed by coating or vapor deposition, etc. The thickness of the base layer is usually thinner, maintaining light transmittance and high flexibility, and mainly serving as the deposition basis for the functional stack of the organic solar cell. On the base layer, various electrode layers, transport layers, and photoelectric conversion functional layers, etc., are deposited to form a solar cell structure.

[0039] Subsequently, the present invention uses a winding method to wind the above-mentioned flexible thin film assembly onto the surface of a fiber substrate to realize the fabrication of a fibrous organic solar cell.

[0040] Through the above preparation method, the decoupling effect of the modification layer on the two flexible polymer layers is utilized. When the preparation is carried out by peeling and then winding, the modification layer can play an auxiliary role in peeling, avoiding damage to the functional stack during the peeling process. When the preparation is carried out by winding along with the substrate layer, the decoupling effect of the modification layer ensures that the stress deformation (such as stretching or compression shrinkage) generated by the substrate layer is not directly transmitted to the weak functional stack, thus protecting the functional stack from mechanical damage. When the preparation method is carried out by winding the whole and then peeling off the substrate layer, both winding damage and peeling damage are avoided, providing a dual protection effect.

[0041] Furthermore, for the material of the modification layer, the preferred choice is any one of silane compounds or polysilazane, or a combination containing at least one of them. This is because silane compounds and polysilazane are silicon-based compounds that form silicon oxide molecular structures during battery fabrication. When the battery cell and substrate are peeled off, at least a portion of the modification layer is attached to the bottom surface of the battery cell. At this time, the silicon oxide molecular structure greatly helps the bottom surface of the battery cell to resist moisture erosion.

[0042] The present invention does not impose strict limitations on the fiber substrate. The fiber substrate is typically a flexible fiber substrate, which can be an insulating fiber or a conductive fiber, or a natural fiber or a synthetic fiber, etc. The diameter of the fiber substrate is not limited, and the fiber substrate can have a fine fiber or a coarse fiber structure. In the present invention, the functional layers are formed by solution deposition, spraying, spin coating, printing, or vapor deposition, and there are no specific limitations on these methods.

[0043] Regarding the winding method, the length direction of the long strip flexible solar cell precursor can be coaxial with the fiber substrate, and the width direction can be wrapped around the circumference of the fiber substrate. Alternatively, it can be wound in an axial spiral shape around the fiber substrate. For the long strip flexible solar cell precursor, its functional stack along the thickness direction includes a first electrode, a light conversion layer, and a second electrode. On the plane, the first electrode extends from one end of the long strip, and the second electrode extends from the other end of the long strip. Thus, multiple flexible solar cell precursors with their electrodes connected end to end along the fiber length direction can be connected in series. It is even possible to connect multiple fiber-shaped organic solar cells coaxially to improve the application voltage.

[0044] The present invention also provides the application of the fiber organic solar cell provided in any of the above embodiments in the field of photovoltaic power generation. The application includes using the fiber organic solar cell alone or weaving it into a fabric structure for receiving light and outputting electrical energy in wearable electronic devices or flexible energy systems.

[0045] The technical solution of the present invention will be further described in detail below through several embodiments and in conjunction with the accompanying drawings. However, the selected embodiments are only for illustrating the present invention and do not limit the scope of the present invention.

[0046] Example 1 This embodiment provides a process for preparing a flexible solar cell precursor and using the flexible solar cell precursor to produce a fibrous organic solar cell by winding, as detailed below.

[0047] Step 1: Prepare a 125 µm thick PET substrate as the solar cell substrate, and deposit a DTS layer of about 50 nm thick on the substrate by vacuum thermal evaporation at 100°C. Step 2: Vacuum evaporation of a Parylene film approximately 3 µm thick onto the modified layer prepared in Step 1; Step 3: Gravure printing a 90 nm thick silver nanowire electrode layer on the composite film prepared in step 2. The sheet resistance of the electrode is about 20 Ω / sq. Step 4: Gravure print approximately 30 nm ZnO nanoparticles onto the electrode layer prepared in Step 3, and anneal in an oven at 130℃ for 10 min; Step 5: Gravure print a 100 nm thick active layer of PM6:L8-BO xylene solution onto the ZnO layer prepared in step 4, and anneal it in an oven at 120℃ for 5 min. Step 6: Deposit a 15nm thick MoO layer onto the active layer prepared in Step 5 using vacuum thermal evaporation deposition. x layer; Step 7: The MoO prepared in step 6 x A 150nm thick Al electrode layer was deposited on the layer using vacuum thermal evaporation deposition to obtain a precursor for a flexible solar cell.

[0048] Step 8: The above-mentioned flexible solar cell precursor is wound onto a polyethylene fiber matrix with the Al electrode layer facing inward, and then the substrate layer is peeled off to obtain the desired product. Figure 2 The fibrous organic solar cell shown can be bonded to the fiber matrix using adhesives, double-sided tape, or other bonding agents with equivalent effects to fix the winding layer to the fiber matrix, thereby obtaining a fibrous organic solar cell.

[0049] Figure 3 The performance comparison test of the fibrous organic solar cell before and after winding is shown. It can be found that although the winding process brings about some changes to the characteristic curve of the solar cell, the performance of the organic solar cell after winding still meets the application requirements.

[0050] Comparative Example 1 This comparative example is largely the same as Example 1, with the main difference being: Cancel step 2 and directly perform steps 3-8 on the PET substrate surface.

[0051] The fibrous organic solar cell obtained in Example 1 uses ultra-flexible Parylene as the substrate, and the effect of the modification layer allows Parylene to be effectively peeled off from the PET substrate and then wound on the fiber substrate to form a fiber cell.

[0052] Comparative Example 1 involves directly fabricating the device on a 125-micron PET substrate. Due to the large thickness and high bending rigidity of the PET substrate, it is difficult to achieve tight winding on the fiber matrix, thus making it impossible to fabricate a structurally complete and stable fibrous organic solar cell. In this embodiment of the application, the substrate of the flexible solar cell is replaced with a parylene film through the process of steps 2 and 3. The sample with parylene as the substrate can be obtained through peeling process, which significantly improves the flexibility and bending adaptability of the substrate, reduces the mechanical stress during the winding process, and enables it to be tightly attached to and stably wound on the surface of the fiber matrix, thus successfully realizing the preparation of fibrous organic solar cells.

[0053] Example 2 This embodiment is largely the same as Embodiment 1, with the only difference being: Step 8: Peel off the substrate layer in the above flexible solar cell precursor. At this time, some of the modification layer will remain on the surface of the substrate layer. Then, the peeled-off cell structure is wound onto the surface of the fiber matrix in the same way to obtain a fibrous organic solar cell.

[0054] In this embodiment, the presence of the modification layer avoids peeling damage while maintaining photoelectric conversion performance.

[0055] Example 3 This embodiment is largely the same as Embodiment 1, with the main difference being: The modified layer was replaced with a perfluoroalkoxyalkane, while the other conditions remained unchanged.

[0056] The process of preparing flexible organic solar cells in this embodiment still has the same characteristics as in Example 1, which allows for large-area roll-to-roll preparation and can also produce high-quality roll-to-roll cell products without wrinkles or delamination; however, after the substrate is peeled off, there are no silicon-based compounds on the bottom surface, and therefore no silicon oxide structure is formed to protect against water vapor erosion.

[0057] Example 4 This embodiment is largely the same as Embodiment 1, with the main difference being: Replace the modification layer material with all-hydrogen polysilazane (PHPS).

[0058] The preparation in this embodiment is almost identical to that in Example 1, both achieving large-area roll-to-roll fabrication, stable and uniform battery performance, and providing a moisture barrier effect on the back side. The hydrophobicity of the battery surface increases after PHPS treatment; contact angle test results from different embodiments are shown below. Figure 3 As shown.

[0059] The physical image of the flexible organic solar cell fabricated in this embodiment is shown below. Figure 4 As shown, the current-voltage characteristics of batteries with different areas were tested as follows: Figure 5 As shown.

[0060] Example 5 This embodiment is largely the same as Embodiment 1, with the main difference being the different preparation process of the flexible solar cell precursor.

[0061] Step 1: Prepare a 150 µm thick PEN substrate as the solar cell substrate, and deposit an approximately 200 nm thick HDS layer on the substrate by vacuum thermal evaporation at 100°C. Step 2: Vacuum evaporate a PI film approximately 2 µm thick onto the modified layer prepared in Step 1; Step 3: Gravure printing a 60 nm thick silver nanowire electrode layer onto the composite film prepared in Step 2; Step 4: Gravure print a 20 nm thick PEI-Zn layer on the electrode layer prepared in step 3, and anneal it in an oven at 130℃ for 10 min; Step 5: Gravure print a 100 nm thick active layer PTB7-Th:L8-BO xylene solution onto the PEI-Zn layer prepared in step 4, and anneal it in an oven at 120℃ for 5 min. Step 6: Deposit a 25 nm thick WO3 layer onto the active layer prepared in Step 5 using vacuum thermal evaporation deposition. x layer; Step 7: The WO prepared in step 6 x A 100 nm thick Ag electrode layer was deposited on the layer using vacuum thermal evaporation deposition.

[0062] Example 6 This embodiment is largely the same as Embodiment 3, with the main difference being the different preparation process of the flexible solar cell precursor.

[0063] Step 1: Prepare a 200 µm thick PI substrate as the solar cell substrate, and deposit a PHPS layer of about 125 nm thick on the substrate by vacuum thermal evaporation at 100°C. Step 2: Vacuum evaporate a PVA film of about 1 µm thickness onto the modified layer prepared in Step 1; Step 3: Gravure printing a 120 nm thick silver nanowire electrode layer onto the composite film prepared in Step 2; Step 4: Gravure print a 40 nm thick PEI-Zn layer on the electrode layer prepared in step 3, and anneal it in an oven at 130℃ for 10 min; Step 5: Gravure print an 80 nm thick PTB7-Th:L8-BTP-BO-4Cl solution onto the PEI-Zn layer prepared in Step 4, and anneal it in an oven at 120℃ for 5 min. Step 6: Deposit a 15 nm thick NiO layer onto the active layer prepared in Step 5 using vacuum thermal evaporation deposition. x layer; Step 7: The NiO prepared in step 6 x A 200 nm thick Au electrode layer was deposited on the layer using vacuum thermal evaporation deposition.

[0064] Although the specific structural dimensions and materials used in Examples 3-7 are different from those in Example 1, they all achieve the same effect as Examples 1 or 2, and can avoid damage to the battery cells and maintain battery performance.

[0065] also, Figure 4 The images show transmittance test images of substrates with different modified layers in the above embodiments. It can be seen that the organic solar cell with Parylene material as the modified layer provided in Example 1 has a better substrate transmittance, which is helpful to improve the efficiency of solar cells.

[0066] Example 7 This embodiment illustrates one application of the aforementioned fibrous organic solar cell, such as... Figure 5 As shown, by weaving the fibrous organic solar cells provided in the above embodiments into a mesh fabric, a wearable organic solar cell device with excellent breathability and deformation resistance can be obtained, which is suitable for use in flexible wearable electronics, outdoor clothing power supplies and other scenarios.

[0067] Based on the above embodiments and comparative examples, it is clear that the fibrous organic solar cell and its preparation method provided by the present invention utilize a modification layer to decouple the substrate layer and the base layer of the organic solar cell, avoiding damage to the functional stack caused by bending and stress during peeling or winding. By constructing the device structure on the surface of the fiber substrate in the form of a winding layer, a one-dimensional structure of the organic solar cell is realized, and it has better bending and weaving adaptability.

[0068] It should be understood that the above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A fibrous organic solar cell, characterized in that, It includes a fiber substrate and a winding layer, wherein the winding layer is wrapped around the surface of the fiber substrate in a winding manner; Along the radial direction and pointing toward the fiber substrate, the wound layer includes at least a modification layer, a base layer and a functional stack in sequence, wherein the modification layer and the base layer are both transparent materials, the base layer is made of a flexible polymer, and the functional stack has a stacked structure of an organic solar cell device.

2. The fibrous organic solar cell according to claim 1, characterized in that... And / or, the fibrous organic solar cell is in a bent, wound, or woven state.

3. The ultrathin flexible large-area organic solar cell according to claim 2, characterized in that, The material of the modification layer includes any one or a combination of two or more of fluorinated polymers, silane compounds, and polysilazane. And / or, the thickness of the modified layer is 50-200 nm.

4. The ultrathin flexible large-area organic solar cell according to claim 3, characterized in that, The fluorinated polymer includes any one or a combination of two or more of polytetrafluoroethylene, perfluoroalkoxyalkane, fluorinated ethylene propylene copolymer, and ethylene-tetrafluoroethylene copolymer. And / or, the silane compounds include any one or a combination of two or more of dodecyltrichlorosilane, hexadecyltrichlorosilane, octadecyltrichlorosilane, perfluorodecyltrichlorosilane, perfluorooctyltrichlorosilane, perfluorodecyltrimethoxysilane, and octadecyltrimethoxysilane; And / or, the polysilazane includes perhydropolysilazane.

5. The ultrathin flexible large-area organic solar cell according to claim 1, characterized in that, The flexible polymer includes any one or a combination of two or more of the following: parylene, polyethylene naphthalate, and polyimide. And / or, the thickness of the substrate layer is 1-3 μm; And / or, the thickness of the substrate layer is 50-200 μm.

6. The fibrous organic solar cell according to claim 1, characterized in that, The functional stack, which is radially directed toward the fiber substrate, sequentially comprises a bottom electrode layer, a first semiconductor transport layer, an organic functional layer, a second semiconductor transport layer, and a top electrode layer.

7. The fibrous organic solar cell according to claim 6, characterized in that, The material of the bottom electrode layer includes any one or a combination of two or more of the following: metal nanowires, conductive polymers, or metal thin films. And / or, the bottom electrode layer is a continuous electrode structure; And / or, the first semiconductor transport layer and the second semiconductor transport layer are respectively selected from an electron transport layer and a hole transport layer; the material of the electron transport layer includes any one or a combination of two or more of zinc oxide, sol-gel zinc oxide, and PEI-modified zinc oxide; the material of the hole transport layer includes any one or a combination of two or more of molybdenum oxide, nickel oxide, and tungsten oxide. And / or, the organic functional layer includes an organic donor material and an organic acceptor material; the organic donor material includes any one or a combination of two or more of PM6, PTB7-Th, and PBDB-T; the organic acceptor material includes any one or a combination of two or more of PCBM, L8-BO, BTP-BO-4Cl, and BTP-eC9. And / or, the material of the top electrode layer includes any one or a combination of two or more of Al, Ag, and Au.

8. A method for preparing a fibrous organic solar cell, characterized in that, include: A fiber substrate and a flexible solar cell precursor are provided. The flexible solar cell precursor includes a substrate layer, a modification layer, a base layer, and a functional stack layer stacked sequentially. The substrate layer and the base layer are both made of flexible polymers, and the thickness of the base layer is less than 10 μm. The base layer and the substrate layer are peelable, and after peeling, at least a portion of the modification layer is attached to the base layer. The functional stack layer has a stacked structure of an organic solar cell device. By winding at least the functional stack, the substrate layer, and a portion of the modification layer as winding layers around the surface of the fiber matrix with the functional stack on the inside, a fibrous organic solar cell is obtained.

9. The preparation method according to claim 8, characterized in that, Specifically, it includes: The substrate layer and the base layer are peeled off, and then a portion of the functional stack, the base layer and a portion of the modification layer are wound as winding layers and wound around the surface of the fiber matrix. Alternatively, the substrate layer, the modification layer, the base layer, and the functional stack can be wound together, and then the substrate layer can be peeled off from the base layer.

10. The application of the fibrous organic solar cell according to any one of claims 1-7 in the field of photovoltaic power generation, characterized in that, The applications include using the fiber organic solar cells individually or weaving them into fabric structures for use in wearable electronic devices or flexible energy systems to receive light and output electrical energy.

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