CN118284070A - Organic solar cell module and manufacturing method thereof - Google Patents

Abstract

The application discloses an organic solar cell module and a manufacturing method thereof, relating to the technical field of solar power generation, wherein the organic solar cell module comprises: at least one cell string comprising a plurality of organic solar cells connected in series in sequence; the organic solar cell includes: a light-transmitting conductive substrate; an organic photoelectric conversion layer disposed on the light-transmitting conductive substrate, the organic photoelectric conversion layer exposing a portion of the light-transmitting conductive substrate to form a step; a first electrode on a surface of the step; a second electrode on the surface of the organic photoelectric conversion layer; for two adjacent organic solar cells in the cell string, one end of the latter organic solar cell far away from the step of the former organic solar cell is overlapped with one end of the former organic solar cell with the step, so that the first electrode of the former organic solar cell is electrically connected with the second electrode of the latter solar cell. The technical scheme of the application can improve the overall performance of the organic solar cell.

Description

Organic solar cell module and manufacturing method thereof

Technical Field

The application relates to the technical field of solar power generation, in particular to an organic solar cell module and a manufacturing method thereof.

Background

Organic solar cells represent an emerging direction in solar energy conversion technology, and their unique characteristics include plasticity, thinness, and transparency, enabling them to accommodate a variety of complex curved surface and building integration applications. Currently, the efficiency of organic solar cells has reached more than 19.6%, which marks a significant progress in improving efficiency.

At present, organic solar cells remain mainly in the research stage of small area, mainly to verify the feasibility of new materials and new processes, and to obtain high-efficiency cells, while the photoelectric conversion efficiency of organic solar cell modules is generally low.

Disclosure of Invention

In view of the above, the present application provides an organic solar cell module and a method for manufacturing the same, which comprises the following steps:

An organic solar cell module comprising:

At least one cell string comprising a plurality of organic solar cells connected in series in sequence;

The organic solar cell includes: a light-transmitting conductive substrate; an organic photoelectric conversion layer disposed on the light-transmitting conductive substrate, the organic photoelectric conversion layer exposing a portion of the light-transmitting conductive substrate to form a step; a first electrode on a surface of the step; a second electrode on the surface of the organic photoelectric conversion layer;

For two adjacent organic solar cells in the cell string, one end of the latter organic solar cell far away from the step of the former organic solar cell is overlapped with one end of the former organic solar cell with the step, so that the first electrode of the former organic solar cell is electrically connected with the second electrode of the latter solar cell.

Optionally, in the above organic solar cell module, the light-transmitting conductive substrate includes: a light-transmitting substrate and a light-transmitting conductive layer arranged on the surface of the light-transmitting substrate;

the organic photoelectric conversion layer and the first electrode are respectively positioned on different areas of the same side surface of the transparent conductive layer, and a gap is reserved between the first electrode and the organic photoelectric conversion layer.

Optionally, in the above organic solar cell module, the entire surface of the second electrode covers a surface of a side of the organic photoelectric conversion layer facing away from the transparent conductive substrate.

Optionally, in the above organic solar cell module, a surface of the organic photoelectric conversion layer on a side facing away from the transparent conductive substrate is a roughened surface, so as to reduce reflectivity of a contact surface between the second electrode and the organic photoelectric conversion layer.

Alternatively, in the above-described organic solar cell module, for two adjacent organic solar cells in the cell string, the gap in the former organic solar cell at least partially overlaps the organic photoelectric conversion layer in the latter organic solar cell.

Optionally, in the above organic solar cell module, the photoelectric conversion layer includes a plurality of organic film layers sequentially laminated on a surface of the light-transmitting conductive substrate;

the region of the transparent conductive substrate corresponding to the organic photoelectric conversion layer is provided with a plurality of protruding structures so as to increase the contact area between the adjacent organic film layers.

Optionally, in the above organic solar cell module, the method further includes: the back plate, one side of the organic solar cell away from the transparent conductive substrate is fixed on the same side surface of the back plate based on the adhesive layer;

Wherein, if the transparent conductive substrate is a flexible substrate, for two adjacent organic solar cells in the cell string, the part of the transparent conductive substrate in the former organic solar cell, which is provided with the first electrode, is bent relative to the part provided with the organic photoelectric conversion layer so as to be lapped on the surface of the organic photoelectric conversion layer in the latter organic solar cell;

If the transparent conductive substrate is a rigid substrate, after the organic solar cells are sequentially overlapped in the same cell string, the transparent conductive substrates all have the same inclination angle on the plane of the backboard, or the planes of the transparent conductive substrates are all parallel to the plane of the backboard.

Alternatively, in the above-described organic solar cell module, if the light-transmitting conductive substrate is a flexible substrate, a portion of the light-transmitting conductive substrate where the first electrode is provided has a first thickness, and a portion of the light-transmitting conductive substrate where the organic photoelectric conversion layer is provided has a second thickness, the first thickness is smaller than the second thickness.

The application also provides a manufacturing method of the organic solar cell module, which comprises the following steps:

Preparing an organic solar cell; the organic solar cell includes: a light-transmitting conductive substrate; an organic photoelectric conversion layer disposed on the light-transmitting conductive substrate, the organic photoelectric conversion layer exposing a portion of the light-transmitting conductive substrate to form a step; a first electrode on a surface of the step; a second electrode on the surface of the organic photoelectric conversion layer;

Sequentially connecting a plurality of organic solar cells in series to form at least one cell string;

For two adjacent organic solar cells in the cell string, one end of the latter organic solar cell far away from the step of the former organic solar cell is overlapped with one end of the former organic solar cell with the step, so that the first electrode of the former organic solar cell is electrically connected with the second electrode of the latter solar cell.

Optionally, in the above manufacturing method, the light-transmitting conductive substrate is a flexible substrate, and the method for forming the battery string includes: for two adjacent organic solar cells in the cell string, bending the part of the light-transmitting conductive substrate with the first electrode in the former organic solar cell relative to the part with the organic photoelectric conversion layer, and overlapping the part on the surface of the organic photoelectric conversion layer in the latter organic solar cell;

or, the transparent conductive substrate is a rigid substrate, and the method for forming the battery string comprises the following steps: in the same cell string, after the organic solar cells are sequentially overlapped, the transparent conductive substrates all have the same inclination angle with the horizontal plane.

As can be seen from the foregoing description, in the organic solar cell module and the manufacturing method thereof provided by the technical scheme of the present application, the organic photoelectric conversion layer of the organic solar cell exposes a portion of the transparent conductive substrate to form a step, the first electrode is disposed on the surface of the step, and the second electrode is disposed on the surface of the organic photoelectric conversion layer, so that the first electrode and the second electrode are located on the same side of the transparent conductive substrate, the organic solar cell can obtain light from the side facing the transparent conductive substrate to perform photoelectric conversion, the first electrode does not block the organic photoelectric conversion layer, the light incident side surface of the organic photoelectric conversion layer is free from the electrode and the gate line, the light utilization rate of the organic photoelectric conversion layer is improved, and the photoelectric conversion efficiency of the organic solar cell is improved.

In addition, for two adjacent organic solar cells, one end of the latter organic solar cell far away from the step is overlapped with one end of the former organic solar cell with the step, and based on the overlapping structure of the two adjacent organic solar cells, the area of the organic photoelectric conversion layer corresponding to the former organic solar cell can shield the area of the organic solar cell corresponding to the step, thereby reducing or even eliminating the interval between the organic photoelectric conversion layers of the two adjacent organic solar cells, enlarging the whole photosensitive area in the organic solar cell assembly, and further improving the photoelectric conversion efficiency of the organic solar cell.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings required for the description of the embodiments or the prior art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to the provided drawings without inventive effort to those skilled in the art.

The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and therefore should not be construed as limiting the application, but rather as limiting the scope of the application, so that any structural modifications, proportional changes, or dimensional adjustments should fall within the scope of the application without affecting the efficacy or achievement thereof.

FIG. 1 is a cut-away view of an organic solar cell;

Fig. 2 is a sectional view of an organic solar cell module according to an embodiment of the present application;

FIG. 3 is a cut-away view of an organic solar cell in the cell string of FIG. 2;

FIG. 4 is a cross-sectional view of another organic solar cell module according to an embodiment of the present application;

Fig. 5 is a cross-sectional view of an organic solar cell according to an embodiment of the present application;

FIG. 6 is a cut-away view of yet another organic solar cell module according to an embodiment of the present application;

FIG. 7 is a cut-away view of yet another organic solar cell module according to an embodiment of the present application;

FIG. 8 is a cut-away view of yet another organic solar cell module according to an embodiment of the present application;

Fig. 9 is a schematic flow chart of a method for manufacturing an organic solar cell module according to an embodiment of the present application;

fig. 10 to fig. 14 are block diagrams of products of the method for manufacturing an organic solar cell according to the embodiment of the present application at different process steps;

Fig. 15 is a cut-away view of yet another organic solar cell module according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will now be described more fully hereinafter with reference to the accompanying drawings, in which it is shown, however, in which some, but not all embodiments of the application are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

As described in the background art, at present, organic solar cells remain mainly in the research stage of small area, mainly to verify the feasibility of new materials and new processes, and to obtain high-efficiency cells, while the photoelectric conversion efficiency of organic solar cell modules is generally low.

At present, the conventional organic solar cell adopts the same electrode structure as that of the crystalline silicon solar cell, and positive and negative electrodes are respectively arranged on two opposite sides of the organic solar cell, so that the electrode positioned on the light incident side of the cell can shield part of photosensitive area of the organic solar cell, and the photoelectric conversion efficiency of the organic solar cell can be reduced.

In addition, in the aspect of organic solar cell group design:

If the organic solar cell module adopts a serial scheme of crystalline silicon solar cells, a larger distance needs to be reserved between two adjacent organic solar cells for realizing serial connection between the two adjacent organic solar cells, light rays entering the distance cannot be utilized, and then the overall photoelectric conversion efficiency of the organic solar cell module can be reduced.

If the organic solar cell module adopts a conventional thin film battery serial scheme, a plurality of battery units are formed on the surface of the same substrate in serial connection, the film layer structure of the organic solar cell is patterned through laser slotting, the serial connection among the battery units is realized based on the specific slotting pattern structure, the organic photoelectric conversion layer and the positive electrode layer and the negative electrode layer on the two sides of the organic photoelectric conversion layer are required to be sequentially subjected to laser slotting, the three laser slotting processes are required, the solar cell module preparation process is complex, and the manufacturing cost is high.

In order to reduce the photosensitive area of the organic solar cell blocked by the light-incident side electrode, a cell structure as shown in fig. 1 may be employed.

As shown in fig. 1, fig. 1 is a cut-away view of an organic solar cell, the organic solar cell comprising:

a light-transmitting conductive substrate 11;

An organic photoelectric conversion layer 12 provided on a surface of the light-transmitting conductive substrate 11, the organic photoelectric conversion layer 12 exposing a portion of the conductive substrate 11 for providing the first electrode 13;

and a second electrode 14, the second electrode 14 being disposed on a side surface of the organic photoelectric conversion layer 12 facing away from the light-transmitting conductive substrate 11.

The second electrode 14 generally adopts a strip electrode structure. A plurality of parallel strip electrodes are arranged on the surface of the organic photoelectric conversion layer 12, and a preset distance is reserved between every two adjacent strip electrodes.

The organic photoelectric conversion layer 12 and the first electrode 13 shown in fig. 1 are located on the same side surface of the transparent conductive substrate 11, and the organic solar cell can collect light on the side facing the transparent conductive substrate 11 to perform photoelectric conversion, for example, the first electrode 13 does not block the organic photoelectric conversion layer 12, so that the light incident side surface of the organic photoelectric conversion layer 12 is free from blocking the electrode and the grid line, the light utilization rate of the organic photoelectric conversion layer 12 is improved, and the photoelectric conversion efficiency of the organic solar cell is improved.

Although the organic solar cell with the structure shown in fig. 1 can avoid the arrangement of the electrode and the gate line on the light incident side surface of the organic photoelectric conversion layer 12, since a portion of the transparent conductive substrate 11 needs to be reserved on one side of the organic photoelectric conversion layer 12 to arrange the first electrode 13, the portion of the transparent conductive substrate 11 may cause a larger space between two adjacent organic solar cells in the organic solar cell module group, and thus the overall photoelectric conversion efficiency of the organic solar cell module may be reduced.

Typically, the thickness of the organic photoelectric conversion layer 12 is about 100nm. Electron holes are generated in the active layer in the middle of the organic photoelectric conversion layer 12, and the electron holes are transported a distance of half the thickness of the organic photoelectric conversion layer 12 in the longitudinal direction, and if the thickness of the organic photoelectric conversion layer 12 is about 100nm, the electron holes are transported a distance of about 50nm in the longitudinal direction. y1 represents an electron longitudinal transport distance, and y2 represents a hole longitudinal transport distance.

The electrons are directly absorbed by the second electrode 14 after being longitudinally transmitted, so that the charge loss is less. However, for holes, not only longitudinal transport but also transverse transport is required, and the transverse transport distance x of holes directly affects the loss of charge of the organic solar cell. The larger the lateral transport distance x of holes, the more charge is lost, thus greatly limiting the broadening of the organic solar cell area.

Based on the above description, although the organic solar cell has significantly progressed in terms of efficiency, in the process of pushing to commercialization, it is still required to solve key problems of manufacturing cost, mass production, and structural design of the assembly.

In view of this, an embodiment of the present application provides an organic solar cell module and a method for manufacturing the same, in which an organic photoelectric conversion layer of an organic solar cell is exposed out of a portion of a transparent conductive substrate to form a step, a first electrode is disposed on a surface of the step, and a second electrode is disposed on a surface of the organic photoelectric conversion layer, so that the first electrode and the second electrode are located on the same side of the transparent conductive substrate, the organic solar cell can obtain light from a side facing the transparent conductive substrate to perform photoelectric conversion, the first electrode does not block the organic photoelectric conversion layer, so that a light-incident side surface of the organic photoelectric conversion layer is free from the electrode and the gate line, light utilization rate of the organic photoelectric conversion layer is improved, and photoelectric conversion efficiency of the organic solar cell is improved.

In addition, for two adjacent organic solar cells, one end of the latter organic solar cell far away from the step is overlapped with one end of the former organic solar cell with the step, and based on the overlapping structure of the two adjacent organic solar cells, the area of the organic photoelectric conversion layer corresponding to the former organic solar cell can shield the area of the organic solar cell corresponding to the step, thereby reducing or even eliminating the interval between the organic photoelectric conversion layers of the two adjacent organic solar cells, enlarging the whole photosensitive area in the organic solar cell assembly, and further improving the photoelectric conversion efficiency of the organic solar cell.

In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.

Referring to fig. 2 and 3, fig. 2 is a cross-sectional view of an organic solar cell module according to an embodiment of the present application, and fig. 3 is a cross-sectional view of an organic solar cell in the cell string shown in fig. 2, where the organic solar cell module according to the embodiment of the present application includes: at least one cell string comprising a plurality of organic solar cells 20 connected in series in sequence.

In the embodiment of the application, the cut-out views of the organic solar cell module are all cut-out views of the organic solar cell module along the serial direction of the plurality of organic solar cells 20 in the same cell string. The number of the organic solar cells 20 in the cell string may be set to any number based on the demand, not limited to 3 as shown in the drawings of the embodiment of the present application.

The organic solar cell 20 includes: a light-transmitting conductive substrate 21; an organic photoelectric conversion layer 22 provided on the light-transmitting conductive substrate 21, the organic photoelectric conversion layer 22 exposing a portion of the light-transmitting conductive substrate 21 to form a step; a first electrode 23, the first electrode 23 being located on a surface of the step; and a second electrode 24, the second electrode 24 being located on the surface of the organic photoelectric conversion layer 22.

For two adjacent organic solar cells 20 in the cell string, the end of the latter organic solar cell 20 away from the step thereof overlaps the end of the former organic solar cell 20 having the step, so that the first electrode 23 of the former organic solar cell 20 is electrically connected with the second electrode 24 of the latter solar cell 20.

In the organic solar cell module provided by the embodiment of the application, the first electrode 23 and the second electrode 24 are arranged on the same side of the transparent conductive substrate 21, the second electrode 24 is arranged on the surface of one side of the organic photoelectric conversion layer 22, which is away from the transparent conductive substrate 21, the organic solar cell 20 can acquire light rays to perform photoelectric conversion based on the side facing the transparent conductive substrate 21, the first electrode 23 does not shade the organic photoelectric conversion layer 22, so that the surface of the light entering side of the organic photoelectric conversion layer 22 does not shade the electrode and the grid line, that is, the light entering side of the organic solar cell 20 does not need to be provided with the electrode or the grid line, so that energy loss caused by blocking of the electrode and the grid line is avoided, the light energy can be utilized to the greatest extent, the light ray utilization rate of the organic photoelectric conversion layer 22 is improved, and the photoelectric conversion efficiency of the organic solar cell 20 is improved.

Moreover, for two adjacent organic solar cells 20, the end of the latter organic solar cell 20 far away from the step is overlapped with the end of the former organic solar cell 20 with the step, based on the overlapping structure of the two adjacent organic solar cells 20, the area of the latter organic solar cell 20 corresponding to the organic photoelectric conversion layer 22 can shield the area of the former organic solar cell 20 corresponding to the step, thereby reducing or even eliminating the interval (the transverse distance in fig. 2) between the organic photoelectric conversion layers 22 of the two adjacent organic solar cells 20, enlarging the whole photosensitive area in the organic solar cell assembly, furthest utilizing the space in the organic solar cell assembly, realizing higher light energy absorption efficiency on the premise of not increasing the size of the organic solar cell assembly, enabling the organic solar cell assembly to realize photoelectric conversion more efficiently in the same space, and further improving the photoelectric conversion efficiency of the organic solar cell.

Based on the overlap joint structure between two adjacent organic solar cells 20, the organic photoelectric conversion layer 22 in the next solar cell 20 can shield at least part of the first electrode 23 in the previous organic solar cell 20, so as to shorten the interval between the organic photoelectric conversion layers 22 in the two organic solar cells 20, reduce the area of the non-photosensitive area in the organic solar cell assembly, and improve the utilization rate of the organic solar cell assembly to light, thereby improving the overall photoelectric conversion efficiency of the organic solar cell assembly. The organic photoelectric conversion layer 22 in the latter solar cell 20 may be provided to completely block the first electrode 23 in the former organic solar cell 20.

As can be seen from the above description, the organic solar cell module provided by the embodiment of the application can improve the space utilization rate; shielding of the electrode and the gate line to the light incident side surface of the organic photoelectric conversion layer 22 can also be avoided; the space between the organic photoelectric conversion layers 22 in the two adjacent organic solar cells 20 can be effectively reduced through the lap joint structure, and the effective photosensitive area is enlarged; energy absorption efficiency can also be improved. Therefore, the technical scheme of the embodiment of the application can improve the overall performance of the organic solar cell module by increasing the light energy collection efficiency and improving the photovoltaic power generation capability, solves the challenges faced by the organic solar cell 20 and the organic solar cell module, provides a brand-new possibility for the development of solar technology, improves the efficiency, reduces the manufacturing cost, widens the application field and provides powerful support for the popularization and application of renewable energy sources.

Alternatively, two adjacent organic solar cells 20 may be arranged in series at the lap joint position based on the conductive member 25. The conductive member 25 covers the first electrode 23 of the previous organic solar cell 20 and is in electrical contact with the second electrode 24 of the next organic solar cell 20, thereby connecting the adjacent two organic solar cells 20 in series. The conductive member 25 may be a conductive paste (such as organic conductive silica gel) or a conductive filler including silver powder.

In the organic solar cell 20, a light-transmitting conductive substrate 21 may be provided including: a light-transmitting substrate 211 and a light-transmitting conductive layer 212 disposed on a surface of the light-transmitting substrate 211; the organic photoelectric conversion layer 22 and the first electrode 23 are respectively located on different areas of the same side surface of the transparent conductive layer 212, and a gap 26 is formed between the first electrode 23 and the organic photoelectric conversion layer 22.

In the embodiment of the present application, the organic photoelectric conversion layer 22 and the first electrode 23 are both disposed on the same side surface of the light-transmitting conductive layer 212 facing away from the light-transmitting substrate 211. The first electrode 23 may realize an electrical connection with the organic photoelectric conversion layer 22 based on the light-transmitting conductive layer 212.

Alternatively, the organic photoelectric conversion layer 22 includes a hole transport layer 221, an active layer 222, and an electron transport layer 223, which are sequentially stacked on the surface of the light-transmitting conductive substrate 21. The first electrode 23 may be electrically connected to the hole transport layer 221 based on the light-transmitting conductive layer 212. The second electrode 24 is directly disposed on the surface of the electron transport layer 223 to be electrically connected to the electron transport layer 223.

The manner of stacking the organic film layers in the organic photoelectric conversion layer 22 is not limited to that shown in fig. 3, and an electron transport layer 223 may be provided between the active layer 222 and the light-transmitting conductive substrate 21, and a hole transport layer 221 may be provided on a surface of the active layer 22 facing away from the conductive layer 21.

In the practice of the present application, the second electrode 24 is disposed entirely covering a side surface of the organic photoelectric conversion layer 22 facing away from the light-transmitting conductive substrate 21. As described above, since the organic solar cell 20 collects light based on the surface of the side facing the transparent conductive substrate 21, the electrode shielding problem is not required to be considered on the side facing away from the transparent conductive substrate 21, and the second electrode 24 can be fully covered to improve the ohmic contact effect, reduce the contact resistance, and further improve the photoelectric conversion efficiency.

The first electrode 23 and the second electrode 24 may be provided as metal electrodes, such as Ag electrodes, so that the electrodes have a small resistance. The first electrode 23 and the second electrode 24 may be provided as electrodes of the same metal material or as electrodes of different metal materials. The material of the metal electrode can be set according to the requirement in the embodiment of the application, and the embodiment of the application is not limited to the material.

In one implementation of the embodiment of the present application, a surface of the organic photoelectric conversion layer 22 on a side facing away from the transparent conductive substrate 21 may be a roughened surface to reduce the reflectivity of the contact surface between the second electrode 24 and the organic photoelectric conversion layer 22.

When the second electrode 24 is formed on the surface of the roughened transparent conductive substrate 21, the second electrode 24 may be formed into a roughened surface adapted to the organic photoelectric conversion layer 22, so as to reduce specular reflection of light, improve the light utilization rate of the organic photoelectric conversion layer 22, and improve the photoelectric conversion efficiency. Furthermore, the roughened surface of the organic photoelectric conversion layer 22 can also improve the surface adhesion stability of the second electrode 24, and can also improve the roughness of the surface of the second electrode 24, thereby improving the adhesion stability between the second electrode 24 and another organic solar cell 20 at the lap joint position.

In the practice of the present application, for two adjacent organic solar cells 20 in a cell string, the gap 26 in the former organic solar cell 20 at least partially overlaps the organic photoelectric conversion layer 22 in the latter organic solar cell 20. In this way, at least part of the gaps 26 in the previous solar cell 20 can be blocked by the organic photoelectric conversion layers 22 in the next organic solar cell 20 based on the overlap structure between the two adjacent organic solar cells 20, so that the distance between the organic photoelectric conversion layers 22 in the two organic solar cells 20 can be shortened, the area of the non-photosensitive area in the organic solar cell module can be reduced, the light utilization rate of the organic solar cell module can be improved, and the overall photoelectric conversion efficiency of the organic solar cell module can be further improved.

As shown in fig. 4, fig. 4 is a cut-out view of another organic solar cell module according to an embodiment of the present application, where, based on any of the above embodiments, in the embodiment shown in fig. 4, in order to shorten the space between the organic photoelectric conversion layers 22 in two organic solar cells 20 to the greatest extent, and to reduce the area of the non-photosensitive area in the organic solar cell module to the greatest extent, the gap 26 in the former organic solar cell 20 is set to be completely blocked by the organic photoelectric conversion layer 22 in the latter organic solar cell 20, that is, the gap 26 in the former organic solar cell 20 and the organic photoelectric conversion layer 22 in the latter organic solar cell 20 completely overlap.

As shown in fig. 5, fig. 5 is a cut-out view of an organic solar cell according to an embodiment of the present application, where in any of the above embodiments, the organic photoelectric conversion layer 22 includes a plurality of organic film layers sequentially stacked on the surface of the transparent conductive substrate 21, and as described above, the plurality of organic film layers may include a hole transport layer 221, an active layer 222, and an electron transport layer 223 sequentially stacked.

In the embodiment shown in fig. 5, the region of the transparent conductive substrate 21 corresponding to the organic photoelectric conversion layer 22 has a plurality of protruding structures 213, and the protruding structures 213 can increase the contact area between adjacent organic film layers in the organic solar cell 20, so that the contact area between adjacent organic film layers can be increased, for example, the area of the organic film layers can be increased, thereby increasing the photoelectric conversion efficiency of the organic solar cell 20. In addition, since the bump structure 213 may increase a contact area between adjacent film layers in the organic solar cell 20, adhesion stability between the film layers may be enhanced based on the bump structure 213. In addition, the bump structure 213 may increase the contact area between the electrode of the second electrode 24 and the organic photoelectric conversion layer 22, and reduce the contact resistance between the electrode of the second electrode 24 and the organic photoelectric conversion layer 22. The bump structure 213 may also increase the adhesion stability of the light-transmitting conductive layer 212 on the surface of the light-transmitting substrate 211.

In an embodiment of the present application, as shown in fig. 6 to 8, the organic solar cell module may further include a back plate 27, and the sides of the organic solar cells 20 facing away from the transparent conductive substrate 21 are all fixed on the same side surface of the back plate 27 based on the adhesive layer 28. In this way, the individual solar cells 20 can be fixed on the same side surface of the back sheet 27 based on the same adhesive layer 28, and the individual solar cells 20 can be carried based on the same back sheet 27 to realize package protection of the individual solar cells 20.

As shown in fig. 6, fig. 6 is a sectional view of still another organic solar cell module according to an embodiment of the present application, where the transparent conductive substrate 21 in the embodiment shown in fig. 6 is a flexible substrate, and for two adjacent organic solar cells 20 in a cell string, a portion of the transparent conductive substrate 21 in the former organic solar cell 20 where the first electrode 23 is disposed is bent with respect to a portion of the transparent conductive substrate where the organic photoelectric conversion layer 22 is disposed so as to overlap the surface of the organic photoelectric conversion layer 22 in the latter organic solar cell 20.

In the embodiment shown in fig. 6, based on the bending characteristic of the flexible conductive substrate, the transparent conductive substrate 21 between the first electrode 23 and the organic photoelectric conversion layer 22 in the organic solar cell 20 may be bent, so that the portion of each transparent conductive substrate 21 where the organic photoelectric conversion layer 22 is disposed may satisfy the same height condition, that is, the portion of each organic solar cell 20 where the transparent conductive substrate 21 is disposed with the organic photoelectric conversion layer 22 is located on the same plane, or approximately on the same plane, so that the portion of each organic solar cell 20 where the transparent conductive substrate 21 is disposed with the organic photoelectric conversion layer 22 has a relatively uniform height, which is convenient for packaging protection of the organic solar cell module.

As shown in fig. 7, fig. 7 is a cross-sectional view of another organic solar cell module according to an embodiment of the present application, where, based on the above embodiment, in the embodiment shown in fig. 7, the transparent conductive substrate 21 is a rigid substrate, and the lap joint structure of each organic solar cell 20 in the cell string is the same as that in the embodiment shown in fig. 2, and the plane of each transparent conductive substrate 21 is parallel to the plane of the back plate 27. At this time, in the same battery string, the distance between each light-transmitting conductive substrate 21 and the plane in which the back plate 27 lies (the longitudinal distance in fig. 7) gradually increases.

In the embodiment of the present application, if the light-transmitting conductive substrate 21 is a flexible substrate, the portion of the light-transmitting conductive substrate 21 where the first electrode 23 is provided has a first thickness, and the portion of the light-transmitting conductive substrate 21 where the organic photoelectric conversion layer 22 is provided has a second thickness, the first thickness being smaller than the second thickness. In this way, the transparent conductive substrate 21 between the first electrode 23 and the organic photoelectric conversion layer 22 in the organic solar cell 20 is bent to a greater extent, so that the portion of the transparent conductive substrate 21 in each organic solar cell 20 where the organic photoelectric conversion layer 22 is disposed has a relatively uniform height.

When the light-transmitting conductive substrate 21 is a rigid substrate, an organic solar cell module may also be provided as shown in fig. 8.

As shown in fig. 8, fig. 8 is a cross-sectional view of another organic solar cell module according to an embodiment of the present application, which is different from the embodiment shown in fig. 7 in that, in the embodiment shown in fig. 8, after the organic solar cells 20 are sequentially overlapped in the same cell string, the transparent conductive substrates 21 all have the same inclination angle with respect to the plane where the back plate 27 is located.

In the embodiment shown in fig. 8, the inclination angles of the organic solar cells 20 in the organic solar cell module are the same, and when the sunlight is not perpendicular to the horizontal plane, the sunlight is vertically incident on the organic solar cells 20 when the back plate 27 is horizontally placed or is obliquely arranged at a smaller angle, so that the photoelectric conversion efficiency is improved.

When the transparent conductive substrate 21 is a rigid substrate, it may be further provided that the organic solar cell module further comprises a transparent planarization layer on the side of the cell string facing away from the back plate 27. The light-transmitting planarizing layer is not shown in fig. 7 and 8. The light-transmitting planarization layer can enable the light incident side of the organic solar cell module to have better flatness, and meanwhile, each organic solar cell 20 can be sealed and protected.

In the design of organic solar cell modules, it is necessary to balance a plurality of factors such as photoelectric conversion efficiency, mechanical stability, and manufacturing cost of the organic solar cell modules. The design of organic solar cell modules is a fairly complex engineering problem for a module structure suitable for mass production, both to increase efficiency and to maintain stability.

According to the technical scheme, the whole photoelectric conversion efficiency of the organic solar cell module can be improved, various organic solar cell module structures which can be produced in a commercial mode are provided, the photoelectric conversion efficiency, the mechanical stability and the manufacturing cost of the organic solar cell module can be considered, and the method is suitable for large-scale manufacturing of the organic solar cell module.

Based on the organic solar cell module provided in the above embodiment, another embodiment of the present application further provides a method for manufacturing an organic solar cell module, where the manufacturing method may be as shown in fig. 9.

As shown in fig. 9, fig. 9 is a schematic flow chart of a method for manufacturing an organic solar cell module according to an embodiment of the present application, and, with reference to the drawings in the foregoing embodiments and as shown in fig. 9, the manufacturing method includes:

Step S11: preparing an organic solar cell 20; the organic solar cell includes: a light-transmitting conductive substrate 21; an organic photoelectric conversion layer 22 provided on the light-transmitting conductive substrate 21, the organic photoelectric conversion layer 22 exposing a portion of the light-transmitting conductive substrate 21 to form a step; a first electrode 23 located on a surface of the step; the second electrode 24 is located on the surface of the organic photoelectric conversion layer 22.

Step S12: the plurality of organic solar cells 20 are sequentially connected in series to form at least one cell string.

For two adjacent organic solar cells 20 in the cell string, the end of the latter organic solar cell 210 away from the step thereof is overlapped with the end of the former organic solar cell 20 having the step, so that the first electrode 23 of the former organic solar cell 20 is electrically connected with the second electrode 24 of the latter solar cell 20.

Based on the manufacturing method shown in fig. 9, the organic solar cell module provided in the above embodiment can be manufactured, and the organic solar cell module has high photoelectric conversion efficiency.

In order to increase the effective photosensitive area of the whole organic solar cell module and reduce the performance loss, in the technical scheme of the embodiment of the application, the organic solar cells 20 are connected in series based on a lap joint structure to form a cell string with a lap joint structure, and the first electrode 23 and the second electrode 24 can be arranged on the same side of the transparent conductive substrate 21.

If the light-transmitting conductive substrate 21 is a flexible substrate, the method of forming the cell string includes: for two adjacent organic solar cells 20 in the cell string, the portion of the light-transmitting conductive substrate 21 in the former organic solar cell 20 where the first electrode 23 is provided is bent with respect to the portion where the organic photoelectric conversion layer 22 is provided, and overlapped on the surface of the organic photoelectric conversion layer 22 in the latter organic solar cell 20.

When the transparent conductive substrate 21 is a flexible substrate, the technical solution according to the embodiment of the present application can form the organic photoelectric conversion layer on the surface of the flexible substrate through a printing or coating process, so as to realize the preparation of the flexible solar cell with high efficiency and large area.

If the light-transmitting conductive substrate 21 is a rigid substrate, the method of forming the cell string includes: in the same cell string, after the organic solar cells 20 are sequentially overlapped, the planes of the transparent conductive substrates 21 and the back plate 27 have the same inclination angle, or the planes of the transparent conductive substrates 21 are parallel to the planes of the back plate 27.

Conventional solution-based production processes cannot realize mass production of organic solar cell modules, and pushing organic solar cells from laboratory to mass production remains a difficult problem. At present, mass production in large area and high performance module structure design by solution method are bottlenecks, and challenges such as cost, process repeatability and the like need to be solved. In the embodiment of the application, the organic photoelectric conversion layer 22 can be formed on the surface of the transparent conductive substrate 21 based on a coating process, the series connection of the organic solar cells 20 can be realized in a lap joint mode between the organic solar cells 20, the cell string with a lap-top structure can be realized, the mass production of the organic solar cells 20 and the organic solar cell modules can be realized, the manufacturing cost is lower, and the manufacturing method is convenient for commercial repeated mass production.

The area broadening of the organic solar cell is limited due to the limitation of the transverse transmission distance x of holes in the organic solar cell, so that the potential of the organic solar cell in large-scale application is restricted. In the embodiment of the application, based on the lap joint mode between the organic solar cells 20, the transverse size of the organic solar cells 20 can be reduced to reduce the transverse transmission distance x of holes, meanwhile, the organic solar cell component has larger overall photosensitive area, and based on the lap joint structure between the organic solar cells 20, the overall photosensitive area is increased, so that the limit that the overall photosensitive area in the conventional organic solar cell component cannot be increased is overcome, the increase of the overall photosensitive area can not increase the transverse transmission distance x of holes in the organic solar cell 20, the transverse transmission distance x of holes can be effectively reduced, and the energy collection efficiency can be effectively improved.

In the manufacturing method provided by the embodiment of the present application, as shown in fig. 10 to 14, fig. 10 to 14 are structure diagrams of the organic solar cell manufacturing method provided by the embodiment of the present application at different process steps, where fig. 10 to 13 are sectional views perpendicular to a plane of the transparent conductive substrate 21, and fig. 14 is a top view facing the plane of the transparent conductive substrate 21, and the manufacturing method includes:

Step S21: as shown in fig. 10, a light-transmitting conductive substrate 21 is prepared.

The method of preparing the light-transmitting conductive substrate 21 includes: a light-transmitting conductive layer 212 is formed on the surface of the light-transmitting substrate 211. The light-transmitting substrate 211 may be a glass-based substrate or a flexible substrate. A conductive compound film, such as a TTO film, may be coated on the surface of the light-transmitting substrate 211 as the light-transmitting conductive layer 212. The light-transmitting conductive layer 212 serves to ensure that separated holes can be collected to the first electrode 23.

After the light-transmitting conductive layer 212 is formed, a hole transport layer 221, an active layer 222, and an electron transport layer 223 are sequentially formed on the surface of the light-transmitting conductive layer 212 based on the subsequent step S22 to step S24 to form the organic photoelectric conversion layer 22 on the surface of the light-transmitting conductive substrate 21.

Step S22: as shown in fig. 11, a hole transport layer 221 is coated on the surface of the light-transmitting conductive layer 212. The hole transport layer 221 may be formed of PEDOT: PSS.

Step S23: as shown in fig. 12, an active layer 222 is coated on the surface of the hole transport layer 221. The material of the active layer 222 may be PM6:y6.

Step S24: as shown in fig. 13, an electron transport layer 223 is coated on the surface of the active layer 222. The material of the electron transport layer 223 may be PDINN.

Step S25: as shown in fig. 3 and 14, a metal electrode is plated on the surface of the electron transport layer 223. The material of the metal electrode may be Ag.

The metal electrode includes: a first electrode 23, the first electrode 23 being located on a surface of the light-transmitting conductive layer 212 exposed by the organic photoelectric conversion layer 22; and a second electrode 24, the second electrode 24 being located on a surface of the electron transport layer 223.

The organic solar cell 20 according to the embodiment of the present application can extract electrons separated from the active layer 222 through the second electrode 24, and simultaneously extract holes separated from the active layer 222 through the light-transmitting conductive layer 212 to the first electrode 23, so that the organic solar cell 20 can effectively separate electrons from holes and extract the electrons through the first electrode 23 and the second electrode 24, respectively, to capture light energy and generate current. Furthermore, the electrodes of the organic solar cell 20 are all disposed on the backlight side so that the light incident side surface of the organic photoelectric conversion layer 22 is free from the shielding of the electrodes and the gate lines.

After the organic solar cells 20 are manufactured, a plurality of organic solar cells 20 are connected in series based on the above-described lap joint structure to form a cell string. In connecting the respective organic solar cells 20 in series, the second electrode 24 of the subsequent organic solar cell 20 may be disposed to overlap the back surface of the light-transmitting conductive substrate 21 of the previous organic solar cell 20 (i.e., the side surface facing away from the organic photoelectric conversion layer 22) such that the first electrode 23 of the previous organic solar cell 20 may be electrically connected with the second electrode 24 of the subsequent organic solar cell 20.

In other embodiments, when the organic solar cells 20 are connected in series, the organic solar cells 20 may be connected in series by bonding, as shown in fig. 15.

As shown in fig. 15, fig. 15 is a cut-away view of another organic solar cell module according to an embodiment of the present application, in this embodiment, a region where a first electrode 23 is disposed on a transparent conductive substrate 21 in a subsequent organic solar cell 20 is back-lapped on a surface of an organic photoelectric conversion layer 22 of a previous organic solar cell 20, and the region is back-lapped on an end of the organic photoelectric conversion layer 22 of the previous organic solar cell 20 away from the first electrode 23 thereof, so that a second electrode 24 of the previous organic solar cell 20 is electrically connected with the first electrode 23 of the subsequent organic solar cell 20.

Adjacent two organic solar cells 20 in the cell string may be connected in series by a conductive paste in a lap joint manner so that the organic solar cells 20 can work cooperatively. After the organic solar cells 20 in the cell string are sequentially connected in series, the voltage can be increased, thereby increasing the output voltage of the entire organic solar cell module.

The organic solar cell assembly may include a plurality of subassemblies. The subassembly includes a plurality of parallel battery strings. In an organic solar cell module, a plurality of cell strings may be connected in parallel to each other to form a sub-module. The plurality of batteries are connected in series and parallel to form the sub-assembly, so that the output current can be increased, and the total output power is improved. The sub-assemblies of the organic solar cell assembly can be connected in series, and after the sub-assemblies are connected in series, the required organic solar cell assembly is formed. The connection mode of the series-parallel connection combination can fully utilize the geometric dimension of the organic solar cell component with the lap joint structure, so that the organic solar cell component can have higher output voltage and output power, and the total output performance of the organic solar cell component can be improved.

As can be seen from the above description, the electrical connection and assembly steps in the organic solar cell module can be performed on the backlight surface of the organic solar cell 20, so that the light incident side surface of the organic photoelectric conversion layer 22 does not need to be provided with an electrode and a grid line, which helps to reduce the light energy loss, improve the efficiency of the whole organic solar cell module, and provide a more efficient and flexible method for mass-producing the organic solar cell 20.

According to the technical scheme provided by the embodiment of the application, the close connection between the organic solar cells 20 can be realized through the lap joint structure between the organic solar cells 20, and the interval between the organic photoelectric conversion layers 22 of the two adjacent organic solar cells 20 connected in series can be effectively reduced, so that the absorption of light energy is maximized, and the photoelectric conversion efficiency is improved.

The technical scheme of the embodiment of the application can also overcome the limitation that the whole photosensitive area in the organic solar cell module can not be widened, so that the same organic solar cell module can be used for arranging a larger number of organic solar cells 20 in the same space, and the space utilization rate is improved.

The technical scheme of the embodiment of the application can also realize the design of no electrode and grid line on the light incident side surface of the organic photoelectric conversion layer 22, avoid the light energy loss caused by the shielding of the electrode and the grid line on the light incident side surface of the organic photoelectric conversion layer 22, and improve the light energy utilization rate of the whole organic solar cell assembly.

The technical scheme of the embodiment of the application can reduce the production cost and improve the manufacturing efficiency by simplifying the manufacturing process, such as a more effective lapping method or optimizing the production flow.

The technical scheme of the embodiment of the application can also shorten the transverse transmission distance x of the hole while increasing the whole photosensitive area in the organic solar cell module, solves the problem that the hole is limited by a larger transverse transmission distance x, and ensures the effective transmission of electrons in the organic solar cell.

Based on the above description, the above effects of the embodiments of the present application can jointly promote the overall performance of the organic solar cell module, and simultaneously improve the utilization rate of sustainable energy, which is helpful for promoting the development of renewable energy technologies.

When the transparent conductive substrate 21 is a flexible substrate, not only the overlap joint in the vertical direction between the adjacent organic solar cells 20 can be realized, but also a curved structure design, which is one of the advantages that conventional crystalline silicon solar cells cannot compare with, can be realized. The flexible substrate, in combination with the flexibility of the material of the organic photoelectric conversion layer 22, allows the organic solar cell 20 to be adapted to various types of curved surfaces, such as curved surfaces (e.g., building surfaces), or surfaces of bending devices (e.g., wearing device surfaces), to more easily accommodate curved surfaces or unconventional various profiled surfaces, providing greater flexibility and versatility to the application of the organic solar cell 20.

In addition, the organic solar cell 20 and the components thereof are lighter and thinner than the crystalline silicon solar cell and the components thereof, so that the organic solar cell 20 and the components thereof have greater advantages in application environments requiring a lighter and thinner design, such as application environments of building surfaces or roofs.

In addition, in the organic solar cell 20, selective absorption of light can be achieved by selecting materials for the different active layers 222. The active layers 222 of different materials may also have different light absorption characteristics, and based on the difference, the active layer 222 having a selective light absorption function suitable for an indoor light environment may be designed, so that the indoor light source may be effectively utilized for photoelectric conversion, and the energy collection efficiency of the organic solar cell 20 to the indoor environment may be improved.

In the description of the present application, each embodiment is described in a progressive manner, or in parallel manner, or in a combination of progressive and parallel manners, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. The embodiments provided by the embodiments of the present application may be combined with each other without contradiction.

It is to be noted, however, that the description of the drawings and embodiments are illustrative and not restrictive. Like reference numerals refer to like structures throughout the embodiments of the specification. In addition, the drawings may exaggerate the thicknesses of some layers, films, panels, regions, etc. for understanding and ease of description. It will also be understood that when an element such as a layer, film, region or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may be present. In addition, "on …" refers to positioning an element on or under another element, but not essentially on the upper side of the other element according to the direction of gravity.

The terms "upper," "lower," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in an article or device comprising the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An organic solar cell module, comprising:

at least one cell string comprising a plurality of organic solar cells connected in series in sequence;

The organic solar cell includes: a light-transmitting conductive substrate; an organic photoelectric conversion layer disposed on the light-transmitting conductive substrate, the organic photoelectric conversion layer exposing a portion of the light-transmitting conductive substrate to form a step; a first electrode on a surface of the step; a second electrode on a surface of the organic photoelectric conversion layer;

For two adjacent organic solar cells in the cell string, one end of the latter organic solar cell far away from the step is overlapped with one end of the former organic solar cell with the step, so that a first electrode of the former organic solar cell is electrically connected with a second electrode of the latter solar cell.

2. The organic solar cell module of claim 1, wherein the light transmissive conductive substrate comprises: a light-transmitting substrate and a light-transmitting conductive layer arranged on the surface of the light-transmitting substrate;

The organic photoelectric conversion layer and the first electrode are respectively positioned on different areas of the same side surface of the light-transmitting conductive layer, and a gap is reserved between the first electrode and the organic photoelectric conversion layer.

3. The organic solar module of claim 2, wherein the second electrode entirely covers a side surface of the organic photoelectric conversion layer facing away from the light transmissive conductive substrate.

4. An organic solar module according to claim 3, wherein a surface of the side of the organic photoelectric conversion layer facing away from the transparent conductive substrate is roughened to reduce the reflectivity of the contact surface between the second electrode and the organic photoelectric conversion layer.

5. The organic solar module of claim 2, wherein for two adjacent organic solar cells in the string, the gap in a preceding organic solar cell at least partially overlaps the organic photoelectric conversion layer in a following organic solar cell.

6. The organic solar module of claim 1, wherein the photoelectric conversion layer comprises a plurality of organic film layers sequentially laminated on the surface of the light-transmissive conductive substrate;

The region of the transparent conductive substrate corresponding to the organic photoelectric conversion layer is provided with a plurality of protruding structures so as to increase the contact area between the adjacent organic film layers.

7. The organic solar power assembly of claim 1, further comprising: the back plate, one side of the organic solar cell facing away from the transparent conductive substrate is fixed on the same side surface of the back plate based on an adhesive layer;

Wherein, if the transparent conductive substrate is a flexible substrate, for two adjacent organic solar cells in the cell string, a portion of the transparent conductive substrate in the former organic solar cell where the first electrode is provided is bent with respect to a portion where the organic photoelectric conversion layer is provided so as to overlap on a surface of the organic photoelectric conversion layer in the latter organic solar cell;

if the transparent conductive substrate is a rigid substrate, after the organic solar cells are sequentially overlapped in the same cell string, the transparent conductive substrate has the same inclination angle with the plane of the back plate, or the planes of the transparent conductive substrates are parallel to the plane of the back plate.

8. The organic solar cell module according to claim 7, wherein if the light-transmitting conductive substrate is a flexible substrate, a portion of the light-transmitting conductive substrate where the first electrode is provided has a first thickness, and a portion of the light-transmitting conductive substrate where the organic photoelectric conversion layer is provided has a second thickness, the first thickness being smaller than the second thickness.

9. A method of manufacturing an organic solar cell module, comprising:

Preparing an organic solar cell; the organic solar cell includes: a light-transmitting conductive substrate; an organic photoelectric conversion layer disposed on the light-transmitting conductive substrate, the organic photoelectric conversion layer exposing a portion of the light-transmitting conductive substrate to form a step; a first electrode on a surface of the step; a second electrode on a surface of the organic photoelectric conversion layer;

Sequentially connecting a plurality of organic solar cells in series to form at least one cell string;

For two adjacent organic solar cells in the cell string, one end of the latter organic solar cell far away from the step is overlapped with one end of the former organic solar cell with the step, so that a first electrode of the former organic solar cell is electrically connected with a second electrode of the latter solar cell.

10. The method of manufacturing according to claim 9, wherein the light-transmitting conductive substrate is a flexible substrate, and the method of forming the battery string comprises: for two adjacent organic solar cells in the cell string, bending the part of the light-transmitting conductive substrate, in the former organic solar cell, provided with the first electrode relative to the part provided with the organic photoelectric conversion layer, and overlapping the part of the light-transmitting conductive substrate, in the latter organic solar cell, on the surface of the organic photoelectric conversion layer;

Or, the transparent conductive substrate is a rigid substrate, and the method for forming the battery string comprises the following steps: in the same cell string, after the organic solar cells are sequentially overlapped, the transparent conductive substrates all have the same inclination angle with the horizontal plane.