Side edge series photovoltaic module and preparation method thereof
By adopting a side-connected series structure design in organic solar cell modules, the problems of photovoltaic functional layer residue and electrode damage caused by laser etching are solved, high-quality sub-cell series connection is achieved, module performance and production efficiency are improved, and costs are reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WEST LAKE OPTOELECTRONICS TECH (HANGZHOU) CO LTD
- Filing Date
- 2026-01-28
- Publication Date
- 2026-04-21
AI Technical Summary
Existing organic solar cell modules are prone to photovoltaic functional layer residue accumulation and electrode damage during laser etching, which affects electrical contact and leads to a decline in module performance.
By adopting a side-connected series structure design, insulating electrode cells are formed on the first and second electrode layers, and a series structure region is formed on their sides, which enables direct contact between sub-cells and eliminates the need for laser etching of photovoltaic functional layers.
It improves the contact stability and electrical conductivity of the upper and lower electrodes, reduces series resistance, enhances the photovoltaic performance and production efficiency of the module, and reduces manufacturing costs.
Smart Images
Figure CN121908736A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of photovoltaic technology, and in particular to a side-connected series photovoltaic module and its manufacturing method. Background Technology
[0002] Organic solar cells, a type of thin-film solar cell, have been widely studied due to their solution-processable fabrication, semi-transparency, flexibility, and portability. Thanks to the emergence of non-fullerene acceptor materials, the photoelectric conversion efficiency of organic solar cells has exceeded 20%, and they are currently transitioning from laboratory research to industrialization, with the potential for widespread application in applications requiring lightweight and clean energy. Laboratory research typically uses individual organic solar cell devices with an area of square millimeters, while practical applications require large-area series modules of at least square centimeters. Currently, progress in this field mainly focuses on donor-acceptor photoelectric semiconductor materials and electron or hole transport functional materials, while the structure and fabrication methods of large-area series modules are relatively lagging behind.
[0003] like Figure 5 As shown, the existing structure of organic solar cells includes an upper electrode layer, a lower electrode layer, and one or more photovoltaic functional layers located between the two electrode layers. Existing module series connection technology involves using laser scribing to etch a P1 line to pattern the lower electrode layer, dividing the entire electrode layer into parallel, non-conductive strip-shaped lower electrode structures. Then, one or more photovoltaic functional layers are fabricated above these strip-shaped electrodes, and a P2 line is etched onto the photovoltaic functional layer using laser scribing, thus patterning the photovoltaic functional layer. The P2 line is offset from the P1 line and parallel to it; the etching of the P2 line exposes the lower electrode layer. Next, an upper electrode layer is fabricated above the patterned photovoltaic functional layers, and a P3 line is etched using laser scribing. The P3 line is parallel to both the P1 and P2 lines, thus creating a strip-shaped pattern for the upper electrode layer. The P3 line divides the upper electrode layer into the upper electrodes of individual sub-cells. Simultaneously, the upper electrode layer physically contacts the lower electrode of the preceding or following sub-cell via the P2 line, achieving series connection between the sub-cells.
[0004] However, existing preparation methods have the following problems: when etching the P2 line on the photovoltaic functional layer using laser etching, photovoltaic functional layer residue is easily accumulated on both sides of the P2 line, thus forming a crater structure; at the same time, laser selective etching cannot guarantee that the photovoltaic functional layer can be completely etched through without damaging the lower electrode layer.
[0005] like Figure 6 As shown, laser etching of the P2 line can cause damage to the lower electrode and substrate (see the dashed circular area in the figure), as well as curling and stacking of the photovoltaic functional layer at the edge of the P2 line (see the dashed rectangular box in the figure). These defects can prevent the upper and lower electrode layers from forming a good electrical contact, thereby affecting the performance of the photovoltaic module. Summary of the Invention
[0006] The purpose of this invention is to overcome the shortcomings of the prior art by providing a side-connected photovoltaic module and its preparation method.
[0007] The objective of this invention is achieved through the following technical solution: a side-connected photovoltaic module, comprising a first electrode layer, a second electrode layer, and a photoelectric conversion layer located between the first electrode layer and the second electrode layer. The first electrode layer comprises a plurality of mutually insulated first electrode units, each first electrode unit comprising a first photoelectric conversion region contacted and covered by the photoelectric conversion layer and a first side-connected structure region located on both sides of the first photoelectric conversion region. The second electrode layer comprises a plurality of mutually insulated second electrode units, each second electrode unit comprising a second photoelectric conversion region contacted and covered by the photoelectric conversion layer and a second side-connected structure region located on both sides of the second photoelectric conversion region. The first electrode units, the corresponding second electrode units, and the photoelectric conversion layer located between them together constitute a sub-cell, and the first side-connected structure region of the subsequent sub-cell and the second side-connected structure region of the previous sub-cell are connected in series.
[0008] Preferably, the first electrode unit and the second electrode unit are arranged sequentially along the sub-cell arrangement direction, and the first side series structure regions on adjacent first electrode units are located on both sides of the photoelectric conversion layer; the second side series structure regions on adjacent second electrode units are located on both sides of the photoelectric conversion layer.
[0009] Preferably, the first electrode unit is L-shaped, comprising a first rectangular region and a second rectangular region perpendicular to the first rectangular region, with the side line of the photoelectric conversion layer located in the second rectangular region; the second electrode unit is L-shaped, comprising a third rectangular region and a fourth rectangular region perpendicular to the third rectangular region, with the side line of the photoelectric conversion layer located in the fourth rectangular region; the area where the first rectangular region on the first electrode unit overlaps with the third rectangular region on the second electrode unit is the first photoelectric conversion region; the area on the first electrode unit other than the first photoelectric conversion region is the first side-connected structure region; the area where the third rectangular region on the second electrode unit overlaps with the first rectangular region on the first electrode unit is the second photoelectric conversion region; the area on the second electrode unit other than the second photoelectric conversion region is the second side-connected structure region.
[0010] Preferably, the length of the second rectangular region in the sub-cell arrangement direction is twice the length of the third rectangular region in the sub-cell arrangement direction; the length of the fourth rectangular region in the sub-cell arrangement direction is twice the length of the third rectangular region in the sub-cell arrangement direction.
[0011] Preferably, the photoelectric conversion layer comprises, in sequence, an electron transport layer, a light-absorbing layer, and a hole transport layer, or in sequence, a hole transport layer, a light-absorbing layer, and an electron transport layer.
[0012] A method for fabricating a side-connected series photovoltaic module includes the following specific steps: S1: Prepare a patterned first electrode layer, so that the first electrode layer has a plurality of mutually insulated first electrode units; S2: A photoelectric conversion layer is prepared on the first electrode layer, and the boundary of the photoelectric conversion layer is treated so that the photoelectric conversion layer covers a part of the first electrode unit, and the area on the first electrode unit not covered by the photoelectric conversion layer forms the first side series structure region. S3: A patterned second electrode layer is fabricated on the photoelectric conversion layer, so that the second electrode layer has several mutually insulated second electrode units; the area of the second electrode unit that does not contact the photoelectric conversion layer forms a second side series structure region; the first side series structure region of the subsequent sub-cell and the second side series structure region of the previous sub-cell are in contact to achieve electrical conduction.
[0013] Preferably, in step S1, the first electrode layer is patterned by laser etching or by screen printing; in step S3, the second electrode layer is patterned by laser etching or by screen printing.
[0014] Preferably, a plurality of "L"-shaped first electrode units are formed on the first electrode layer by patterning, each first electrode unit including a first rectangular region and a second rectangular region perpendicular to the first rectangular region, and the side line of the photoelectric conversion layer falls into the second rectangular region; a plurality of "L"-shaped second electrode units are formed on the second electrode layer by patterning, each second electrode unit including a third rectangular region and a fourth rectangular region perpendicular to the third rectangular region, and the side line of the photoelectric conversion layer falls into the fourth rectangular region.
[0015] Preferably, in step S2, when performing boundary treatment on the photoelectric conversion layer, excess areas on both sides of the photoelectric conversion layer are wiped away with a solvent, so that the side lines on both sides of the photoelectric conversion layer reach the designed position.
[0016] As a preferred application, it is used in the fabrication of organic thin-film solar cells.
[0017] The beneficial effects of this invention are: 1. This invention forms mutually insulated first and second electrode units on the first and second electrode layers through patterning. Simultaneously, it forms outwardly extending first and second side-connected series structure regions on the sides of the first and second electrode units. Through direct contact between the electrodes in the first and second side-connected series structure regions, series connection between sub-cells is formed. This eliminates the need for laser etching to penetrate the photoelectric conversion layer (photovoltaic functional layer), solving the problems of etching residue and electrode damage in the photoelectric conversion layer (photovoltaic functional layer). It significantly improves the stability of the upper and lower electrode contact and the electrical conduction efficiency, effectively reduces the series resistance of the module (the contact resistance at the P2 line position in the prior art), suppresses exciton recombination caused by electrode damage, achieves high-quality series connection between sub-cells, and improves the performance of photovoltaic modules, especially the low-light photovoltaic performance of the modules.
[0018] 2. The preparation method of the present invention only requires patterning on the first electrode layer and the second electrode layer, eliminating the laser etching process of the photoelectric conversion layer (photovoltaic functional layer), simplifying the overall process flow, reducing the dependence on high-precision laser equipment, improving production efficiency, and thus helping to reduce the manufacturing cost of photovoltaic modules. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of the first electrode layer.
[0020] Figure 2 This is a schematic diagram of the structure of the second electrode layer.
[0021] Figure 3 This is a schematic diagram of the preparation process of the present invention.
[0022] Figure 4 This is an actual image of the side-connected contact area of the side-connected photovoltaic module of the present invention.
[0023] Figure 5 This is a schematic diagram of an existing organic solar cell structure.
[0024] Figure 6 This is an actual image of the damage to the lower electrode and substrate caused by laser etching of the P2 line in existing technology, as well as the curling and stacking of the photovoltaic functional layer at the edge of the P2 line.
[0025] In the figure: 1. First electrode layer, 2. First electrode unit, 3. Second electrode layer, 4. Second electrode unit, 5. Photoelectric conversion layer. Detailed Implementation
[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below 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 are within the scope of protection of the present invention.
[0027] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.
[0028] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.
[0029] like Figures 1 to 3 As shown, a side-connected photovoltaic module includes a first electrode layer 1, a second electrode layer 3, and a photoelectric conversion layer 5 located between the first electrode layer 1 and the second electrode layer 3. The first electrode layer 1 includes several mutually insulated first electrode units 2. Each first electrode unit 2 includes a first photoelectric conversion region covered by the photoelectric conversion layer 5 and a first side-connected structure region located on one side of the first photoelectric conversion region. The second electrode layer 3 includes several mutually insulated second electrode units 4. Each second electrode unit 4 includes a second photoelectric conversion region covered by the photoelectric conversion layer 5 and a second side-connected structure region located on one side of the second photoelectric conversion region. The first electrode units 2, the corresponding second electrode units 4, and the photoelectric conversion layer 5 located between them together constitute a sub-cell. The first side-connected structure region of the subsequent sub-cell and the second side-connected structure region of the previous sub-cell are connected in series.
[0030] Each sub-cell can independently complete the photoelectric conversion process, converting incident light energy into electrical energy; the sub-cells are connected in series in their corresponding side-connected structure regions. All sub-cells are arranged sequentially along a straight line.
[0031] Existing technologies rely on laser etching of the P2 line to achieve conduction between the upper and lower electrodes. This easily leads to a "crater structure" of photovoltaic functional layer residue accumulation. Furthermore, during actual laser etching, it is difficult to precisely control the etching depth, which can easily damage the lower electrode layer or leave residual functional layer that hinders electrical contact. This invention forms mutually insulated first electrode cells 2 and second electrode cells 4 on the first electrode layer 1 and second electrode layer 3 through patterning. Simultaneously, it forms outwardly extending first and second side-connected series structure regions on the sides of the first and second electrode cells 2 and 4. Through orderly direct contact between the first and second side-connected series structure regions, series connection between sub-cells is formed. This eliminates the need for laser etching to penetrate the photoelectric conversion layer 5 (photovoltaic functional layer), completely solving the problems of etching residue and electrode damage in the photoelectric conversion layer 5 (photovoltaic functional layer). This significantly improves the stability of the upper and lower electrode contact and the electrical conduction efficiency, effectively reduces the series resistance of the module, achieves high-quality series connection between sub-cells, and improves the performance of the photovoltaic module.
[0032] Traditional manufacturing processes require sequential laser etching on the lower electrode layer, the photoelectric conversion layer 5 (photovoltaic functional layer), and the upper electrode layer, necessitating three laser etching steps. This process is cumbersome and demands extremely high precision from the laser equipment and precise control of etching parameters. It not only increases manufacturing time and equipment investment but also increases the risk of module failure due to etching deviations. The method of this invention only requires patterning on the first electrode layer 1 and the second electrode layer 3, eliminating the laser etching step of the photoelectric conversion layer 5 (photovoltaic functional layer). This shortens the overall process flow, reduces reliance on high-precision laser equipment, and thus helps reduce the manufacturing cost of photovoltaic modules.
[0033] The first electrode cell 2 and the second electrode cell 4 are arranged sequentially along the sub-cell arrangement direction. The first side series structure regions on adjacent first electrode cells 2 are located on both sides of the photoelectric conversion layer 5. The second side series structure regions on adjacent second electrode cells 4 are located on both sides of the photoelectric conversion layer 5.
[0034] The first electrode cell 2 and the second electrode cell 4 are arranged alternately along the sub-cell arrangement direction. The first side series structure areas of adjacent first electrode cells 2 are located on both sides of the photoelectric conversion layer 5, and the second side series structure areas of adjacent second electrode cells 4 are also correspondingly located on both sides. This allows the first side series structure area of the subsequent sub-cell to precisely connect with the second side series structure area of the previous sub-cell, forming a unidirectional and continuous series conduction path. This structure avoids current shunting and crosstalk problems that may be caused by the same-side arrangement of side structure areas, ensuring that the photogenerated current of each sub-cell can be transmitted sequentially along a preset direction, significantly reducing the current loss inside the component and improving the overall circuit conduction stability.
[0035] Meanwhile, this staggered arrangement maximizes the use of the module's substrate space, increases the effective photoelectric conversion area ratio, and can integrate more sub-cells under the same substrate size, directly improving the overall output power of the module.
[0036] like Figure 1 and Figure 2 As shown, the first electrode unit 2 is L-shaped, including a first rectangular region and a second rectangular region perpendicular to the first rectangular region, with the side line of the photoelectric conversion layer 5 located in the second rectangular region; the second electrode unit 4 is L-shaped, including a third rectangular region and a fourth rectangular region perpendicular to the third rectangular region, with the side line of the photoelectric conversion layer 5 located in the fourth rectangular region; the area where the first rectangular region on the first electrode unit 2 overlaps with the third rectangular region on the second electrode unit 4 is the first photoelectric conversion region; the area on the first electrode unit 2 other than the first photoelectric conversion region is the first side-connected structure region; the area on the second electrode unit 4 where the third rectangular region overlaps with the first rectangular region on the first electrode unit 2 is the second photoelectric conversion region; the area on the second electrode unit 4 other than the second photoelectric conversion region is the second side-connected structure region.
[0037] The first electrode cell 2 and the second electrode cell 4 have an "L"-shaped structure, clearly dividing the electrode cell into a rectangular photoelectric conversion region and a vertically extending series structure region. The side lines of the photoelectric conversion layer 5 are confined within the vertical second / fourth rectangular region, ensuring that the photoelectric conversion region only undertakes the function of generating and transporting photogenerated carriers, while the side series structure region is only responsible for the electrical conduction of adjacent sub-cells, and the two functions do not interfere with each other. This partitioned design avoids the encroachment or damage of the effective area of the photoelectric conversion layer 5 by the series connection structure, ensuring the integrity of the photoelectric conversion region; at the same time, the clear boundary definition can prevent functional area confusion caused by coating deviations of the photoelectric conversion layer 5 during the fabrication process, and improve the consistency of the functional area size of each electrode cell.
[0038] Secondly, the second or fourth rectangular region of the "L"-shaped electrode cell provides a flat and regular contact plane for the side series structure area. This design increases the effective contact area between adjacent electrode cells and results in a higher degree of flatness at the contact interface. This structure can significantly reduce series contact resistance and reduce energy loss during current transmission. At the same time, the larger and regular planar contact form can improve the mechanical stability of the series connection and avoid the problem of sub-cell series failure caused by component bending or vibration.
[0039] In addition, the "L"-shaped electrode unit shape enables the electrode units to be arranged without gaps, allowing for a high-density arrangement of sub-cells on the substrate.
[0040] The length of the second rectangular region in the direction of sub-cell arrangement is twice the length of the third rectangular region in the direction of sub-cell arrangement.
[0041] The photoelectric conversion layer 5 includes, in sequence, an electron transport layer, a light absorption layer, and a hole transport layer, or in sequence, a hole transport layer, a light absorption layer, and an electron transport layer.
[0042] like Figure 3 As shown, a method for fabricating a side-connected photovoltaic module includes the following specific steps: S1: Prepare a patterned first electrode layer 1, such that the first electrode layer 1 has a plurality of mutually insulated first electrode units 2.
[0043] In this step, the first electrode layer 1 can be prepared first by processes such as vapor deposition, sputtering, and electrochemical deposition. Then, the first electrode layer 1 can be patterned by laser etching to form a number of first electrode units 2 on the first electrode layer 1. Alternatively, the first electrode layer 1 can be prepared directly by screen printing, roll-to-roll gravure printing, or roll-to-roll screen printing technology. The first electrode layer 1 with the target pattern can be directly prepared using the template of screen printing or gravure printing.
[0044] S2: A photoelectric conversion layer 5 is prepared on the first electrode layer 1, and the photoelectric conversion layer 5 is subjected to boundary treatment so that the photoelectric conversion layer 5 covers a part of the first electrode unit 2, and the area on the first electrode unit 2 not covered by the photoelectric conversion layer 5 forms the first side series structure region. In this step, when performing boundary treatment on the photoelectric conversion layer 5, excess areas on both sides of the photoelectric conversion layer 5 are wiped away with solvent, so that the side lines on both sides of the photoelectric conversion layer 5 reach the designed position.
[0045] In addition, strip-shaped photoelectric conversion layers can also be directly prepared by methods such as slot coating, screen printing, roll-to-roll gravure printing, roll-to-roll slot coating, and roll-to-roll screen printing.
[0046] S3: A patterned second electrode layer 3 is prepared on the photoelectric conversion layer 5, so that the second electrode layer 3 has a number of mutually insulated second electrode units 4; the area on the second electrode unit 4 not covered by the photoelectric conversion layer 5 forms a second side series structure region; the second side series structure region contacts the first side series structure region below to achieve electrical conduction.
[0047] In this step, the second electrode layer 3 can be prepared first by processes such as vapor deposition, sputtering, and electrochemical deposition. Then, the second electrode layer 3 can be patterned by laser etching to form several second electrode units 4 on the second electrode layer 3. Alternatively, the second electrode layer 3 can be prepared directly by screen printing, roll-to-roll gravure printing, or roll-to-roll screen printing technology. The second electrode layer 3 with the target pattern can be directly prepared using the template of screen printing or gravure printing.
[0048] Specifically, a plurality of "L"-shaped first electrode units 2 are formed on the first electrode layer 1 through patterning processing. Each first electrode unit 2 includes a first rectangular region and a second rectangular region perpendicular to the first rectangular region, and the side line of the photoelectric conversion layer 5 falls into the second rectangular region. A plurality of "L"-shaped second electrode units 4 are formed on the second electrode layer 3 through patterning processing. Each second electrode unit 4 includes a third rectangular region and a fourth rectangular region perpendicular to the third rectangular region, and the side line of the photoelectric conversion layer 5 falls into the fourth rectangular region.
[0049] like Figure 4 As shown, the side-connected photovoltaic modules prepared by this method have no damage to the side-connected contact area (the P2 position of traditional photovoltaic modules) (as shown in the dashed box in the figure), and there is no curling or accumulation at the edges, resulting in a significant improvement in quality.
[0050] The method for preparing a side-connected photovoltaic module of the present invention can be applied to the preparation of organic thin-film solar cells.
[0051] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.
Claims
1. A side-connected series photovoltaic module, characterized in that, The battery comprises a first electrode layer, a second electrode layer, and a photoelectric conversion layer located between the first electrode layer and the second electrode layer. The first electrode layer includes several mutually insulated first electrode units. Each first electrode unit includes a first photoelectric conversion region covered by the photoelectric conversion layer and a first side-connected structure region located on both sides of the first photoelectric conversion region. The second electrode layer includes several mutually insulated second electrode units. Each second electrode unit includes a second photoelectric conversion region covered by the photoelectric conversion layer and a second side-connected structure region located on both sides of the second photoelectric conversion region. The first electrode units, the corresponding second electrode units, and the photoelectric conversion layer located between them together constitute a sub-cell. The first side-connected structure region of the subsequent sub-cell and the second side-connected structure region of the previous sub-cell are connected in series.
2. A side-connected series photovoltaic module according to claim 1, characterized in that, The first electrode unit and the second electrode unit are arranged sequentially along the sub-cell arrangement direction. The first side series structure region on the adjacent first electrode unit is located on both sides of the photoelectric conversion layer. The second side series structure region on the adjacent second electrode unit is located on both sides of the photoelectric conversion layer.
3. A side-connected series photovoltaic module according to claim 2, characterized in that, The first electrode unit is L-shaped, and includes a first rectangular region and a second rectangular region perpendicular to the first rectangular region, with the side line of the photoelectric conversion layer located in the second rectangular region; the second electrode unit is L-shaped, and includes a third rectangular region and a fourth rectangular region perpendicular to the third rectangular region, with the side line of the photoelectric conversion layer located in the fourth rectangular region. The area where the first rectangular region on the first electrode unit overlaps with the third rectangular region on the second electrode unit is the first photoelectric conversion region; the area on the first electrode unit other than the first photoelectric conversion region is the first side-connected structure region; the area where the third rectangular region on the second electrode unit overlaps with the first rectangular region on the first electrode unit is the second photoelectric conversion region; the area on the second electrode unit other than the second photoelectric conversion region is the second side-connected structure region.
4. A side-connected series photovoltaic module according to claim 3, characterized in that, The length of the second rectangular region in the direction of sub-cell arrangement is twice the length of the third rectangular region in the direction of sub-cell arrangement.
5. A side-connected series photovoltaic module according to claim 1, characterized in that, The photoelectric conversion layer comprises, in sequence, an electron transport layer, a light-absorbing layer, and a hole transport layer, or in sequence, a hole transport layer, a light-absorbing layer, and an electron transport layer.
6. A method for preparing a side-connected photovoltaic module as described in any one of claims 1-5, characterized in that, The specific steps include the following: S1: Prepare a patterned first electrode layer, so that the first electrode layer has a plurality of mutually insulated first electrode units; S2: A photoelectric conversion layer is prepared on the first electrode layer, and the photoelectric conversion layer is subjected to boundary treatment so that the photoelectric conversion layer covers a part of the first electrode unit, and the area on the first electrode unit not covered by the photoelectric conversion layer forms the first side series structure region. S3: A patterned second electrode layer is fabricated on the photoelectric conversion layer, so that the second electrode layer has several mutually insulated second electrode units; the area of the second electrode unit that does not contact the photoelectric conversion layer forms a second side series structure region; the first side series structure region of the subsequent sub-cell and the second side series structure region of the previous sub-cell are in contact to achieve electrical conduction.
7. The method for preparing a side-connected photovoltaic module according to claim 6, characterized in that, In step S1, the first electrode layer is patterned by laser etching or by screen printing. In step S3, the second electrode layer is patterned by laser etching or by screen printing.
8. The method for preparing a side-connected photovoltaic module according to claim 6, characterized in that, By patterning, several "L"-shaped first electrode units are formed on the first electrode layer. Each first electrode unit includes a first rectangular region and a second rectangular region perpendicular to the first rectangular region, and the side line of the photoelectric conversion layer falls into the second rectangular region. By patterning, several "L"-shaped second electrode units are formed on the second electrode layer. Each second electrode unit includes a third rectangular region and a fourth rectangular region perpendicular to the third rectangular region, and the side line of the photoelectric conversion layer falls into the fourth rectangular region.
9. The method for preparing a side-connected photovoltaic module according to claim 6, characterized in that, In step S2, when performing boundary processing on the photoelectric conversion layer, excess areas on both sides of the photoelectric conversion layer are wiped away with solvent, so that the edge lines on both sides of the photoelectric conversion layer reach the designed position.
10. The method for preparing a side-connected photovoltaic module according to claim 6, characterized in that, It is used in the fabrication of organic thin-film solar cells.