Organic solar cell structure based on ink-jet printing

Abstract

The utility model discloses an organic solar cell structure based on ink-jet printing, which comprises a substrate, a TCO layer arranged on the upper surface of the substrate, an anode interface modification layer arranged on the upper surface of the TCO layer, an active layer arranged on the upper surface of the anode interface modification layer, and a cathode interface modification layer arranged on the upper surface of the active layer. The upper surface of the TCO layer is provided with an anode interface modification layer, the upper surface of the cathode interface modification layer is provided with a cathode, the substrate is provided with a plurality of longitudinally arranged isolation layers, the isolation layers penetrate through the TCO layer, the anode interface modification layer, the active layer and the cathode interface modification layer, two sides of the cathode are provided with isolation gaps, and a cover plate is arranged above the cathode. Each cell is separated by a barrier layer, each barrier layer forms a closed pattern in each single solar cell, anodes of the inner ring and the outer ring of each organic cell are exposed, and the inner ring and the outer ring of the organic layer in the anode area are simultaneously connected with the cathode of the next cell, so that the series resistance of the anodes is effectively reduced.

Description

Technical Field

[0001] The utility model relates to a solar cell, more specifically, to an organic solar cell structure based on inkjet printing. Background Art

[0002] The heat loss of organic solar cell devices is proportional to the series resistance and area. When the area of ​​the device is enlarged, the resistance of the device also increases, which greatly increases the heat loss of the device and causes the photoelectric conversion efficiency of the device to decrease. A common approach is to design the organic solar cell device as multiple small-area batteries connected in series, which can greatly reduce the series resistance and thus maintain the photoelectric conversion efficiency of the device. Multiple small-area batteries connected in series involve the patterning of the organic layer. Some solutions propose adding a sacrificial layer before or during the production of the organic layer, and removing the sacrificial layer after the organic layer is completed to achieve the purpose of patterning. However, this solution adds multiple processes, causing water, oxygen, etc. to cause great damage to organic devices. Water and oxygen will affect the stability and life of organic solar cells. During the manufacturing process, the organic layer is exposed to the air for several hours, which can directly lead to device failure.

[0003] Chinese utility model patent document CN201120091198.0 discloses an organic solar cell structure, which includes a transparent electrode layer, an anode buffer layer, an electron donor layer, an electron acceptor layer and a back electrode layer in order from the direction of sunlight irradiation; wherein: a metal layer is provided between the transparent electrode layer and the anode buffer layer, and the metal layer is in close contact with the transparent electrode layer and the anode buffer layer. The metal layer is a grid-shaped metal layer. The grid-shaped metal layer is formed by screen printing a metal paste. The grid-shaped metal layer is evaporated or sputtered through a mask. The grid-shaped metal layer is formed by lamination. The metal layer is silver or aluminum.

[0004] Obviously, this patent introduces a grid-shaped metal layer so that the positive charges generated by the light of the organic solar cell will be conducted to the external circuit through the low-resistance metal grid after reaching the transparent electrode layer, thereby reducing the loss on the transparent electrode layer. However, it cannot solve the damage caused to organic devices by the existing patterning process. Utility Model Content

[0005] Based on this, it is necessary to provide an organic solar cell structure based on inkjet printing for the above technical problems, comprising a substrate, a TCO layer is provided on the upper surface of the substrate, an anode interface modification layer is provided on the upper surface of the TCO layer, an active layer is provided on the upper surface of the anode interface modification layer, a cathode interface modification layer is provided on the upper surface of the active layer, a cathode is provided on the upper surface of the cathode interface modification layer, and a plurality of longitudinally arranged isolation layers are provided on the substrate, the isolation layers penetrate the TCO layer, the anode interface modification layer, the active layer and the cathode interface modification layer, isolation gaps are provided on both sides of the cathode, and a cover plate is provided above the cathode. The utility model provides an organic solar cell structure based on inkjet printing, each battery is separated by a barrier layer, each barrier layer forms a closed pattern in each single solar cell, the inner and outer rings of each organic battery have an exposed anode, and the inner and outer rings of the organic layer in the anode area are simultaneously connected to the negative electrode of the next section, which effectively reduces the series resistance of the positive electrode. The organic solar cell structure based on inkjet printing has a simple manufacturing process and provides a single-section or multi-section series device structure for wearable products.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] An organic solar cell structure based on inkjet printing, characterized in that the organic solar cell structure based on inkjet printing comprises a substrate, a TCO layer is provided on the upper surface of the substrate, an anode interface modification layer is provided on the upper surface of the TCO layer, an active layer is provided on the upper surface of the anode interface modification layer, a cathode interface modification layer is provided on the upper surface of the active layer, a cathode is provided on the upper surface of the cathode interface modification layer, a plurality of longitudinally arranged isolation layers are provided on the substrate, the isolation layers penetrate the TCO layer, the anode interface modification layer, the active layer and the cathode interface modification layer, isolation gaps are provided on both sides of the cathode, and a cover plate is provided above the cathode.

[0008] As a preferred embodiment of the utility model, the top of the isolation layer is flush with the top of the cathode interface modification layer.

[0009] As a preferred embodiment of the utility model, the thickness of the anode interface modification layer is 20-100 nm, the thickness of the active layer is 50-300 nm, and the thickness of the cathode interface modification layer is 1-50 nm.

[0010] As a preferred embodiment of the utility model, the thickness of the anode interface modification layer is 50nm, the thickness of the active layer is 120nm, and the thickness of the cathode interface modification layer is 10nm.

[0011] As a preferred embodiment of the utility model, a desiccant layer is provided on the inner side wall of the cover plate.

[0012] As a preferred embodiment of the utility model, the cover plate is adhered to the substrate by UV glue.

[0013] As a preferred embodiment of the present invention, the desiccant layer is separated from the cathode by a preset isolation distance.

[0014] As a preferred embodiment of the present utility model, the isolation distance is 5 to 10 nm.

[0015] As a preferred embodiment of the present utility model, the isolation distance is 7nm.

[0016] As a preferred embodiment of the utility model, the top of the isolation layer is provided with an extension portion, and the extension portion fills the isolation gap.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model provides an organic solar cell structure based on inkjet printing, each cell is separated by a barrier layer, each barrier layer forms a closed pattern in each single solar cell, the inner and outer rings of each organic cell have anodes exposed, and the inner and outer rings of the organic layer in the anode area are simultaneously connected to the next negative electrode, effectively reducing the series resistance of the positive electrode. The organic solar cell structure based on inkjet printing has a simple manufacturing process and provides a single-cell or multi-cell series device structure for wearable products.

[0019] In addition, a desiccant layer can be provided on the inner side wall of the cover plate. The desiccant layer is separated from the cathode by a preset isolation distance. The desiccant layer can effectively absorb water vapor in the sealing structure in the cover plate, thereby preventing the cathode from rusting and causing circuit disconnection, and effectively improving the reliability of the organic solar cell structure.

[0020] In addition, an extension portion may be provided on the top of the isolation layer. The extension portion fills the isolation gap. The extension portion can be used to further reduce the leakage current between the cathode and anode interface modification layers, thereby further improving the performance of the organic solar cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] FIG1 is a schematic diagram of the three-dimensional structure of an organic solar cell structure based on inkjet printing according to the present invention;

[0023] FIG2 is a cross-sectional view of the organic solar cell structure based on inkjet printing along line AA in FIG1 ;

[0024] FIG3 is a cross-sectional view of the organic solar cell structure based on inkjet printing along line BB in FIG1 ;

[0025] FIG4 is a cross-sectional view of the organic solar cell structure based on inkjet printing in FIG3 , where a cover plate is added;

[0026] FIG5 is a structural cross-sectional view of another embodiment of an organic solar cell structure based on inkjet printing according to the present invention;

[0027] FIG6 is a schematic diagram of the application structure of an organic solar cell structure based on inkjet printing of the present invention, in which an anode pattern is displayed;

[0028] FIG7 is a schematic diagram of the structure of the organic solar cell based on inkjet printing in FIG6 , where a cathode pattern is shown;

[0029] The markings in the figure are as follows: 1. substrate; 10. desiccant layer; 2. TCO layer; 3. anode interface modification layer; 4. active layer; 5. cathode interface modification layer; 6. cathode; 61. isolation gap; 7. isolation layer; 71. extension part; 8. cover plate; 9. UV glue; D. isolation distance; M1. anode pattern; M2. cathode pattern. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0031] As described in the background technology, for organic solar cell devices in the prior art, heat loss is proportional to the series resistance and area. When the area of ​​the device is enlarged, the resistance of the device also increases, which greatly increases the heat loss of the device and causes the photoelectric conversion efficiency of the device to decrease. A common approach is to design the organic solar cell device as a plurality of small-area batteries connected in series, which can greatly reduce the series resistance and thus maintain the photoelectric conversion efficiency of the device. The connection of multiple small areas in series involves the patterning of the organic layer. Some solutions propose to add a sacrificial layer before or during the production of the organic layer, and remove the sacrificial layer after the organic layer is completed to achieve the purpose of patterning. However, this solution adds multiple processes, causing water, oxygen, etc. to cause great damage to the organic device. Water and oxygen will affect the stability and life of the organic solar cell. During the manufacturing process, the organic layer is exposed to the air for several hours, which can directly lead to device failure.

[0032] In order to solve this technical problem, the utility model provides an organic solar cell structure based on inkjet printing, comprising a substrate 1, a TCO layer 2 is provided on the upper surface of the substrate 1, an anode interface modification layer 3 is provided on the upper surface of the TCO layer 2, an active layer 4 is provided on the upper surface of the anode interface modification layer 3, a cathode interface modification layer 5 is provided on the upper surface of the active layer 4, a cathode 6 is provided on the upper surface of the cathode interface modification layer 5, a plurality of longitudinally arranged isolation layers 7 are provided on the substrate 1, the isolation layers 7 penetrate the TCO layer 2, the anode interface modification layer 3, the active layer 4 and the cathode interface modification layer 5, isolation gaps 61 are provided on both sides of the cathode 6, and a cover plate 8 is provided above the cathode 6.

[0033] Through the above structural design, each cell is separated by a barrier layer 7, and each barrier layer 7 forms a closed pattern in each single solar cell. The inner and outer rings of each organic cell have exposed anodes, and the inner and outer rings of the organic layer in the anode area are simultaneously connected to the next negative electrode, effectively reducing the series resistance of the positive electrode. The organic solar cell structure based on inkjet printing has a simple manufacturing process and provides a single-cell or multi-cell series device structure for wearable products.

[0034] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] Example 1

[0038] As shown in Figures 1 to 4, the organic solar cell structure based on inkjet printing includes a substrate 1, a TCO layer 2 is provided on the upper surface of the substrate 1, an anode interface modification layer 3 is provided on the upper surface of the TCO layer 2, an active layer 4 is provided on the upper surface of the anode interface modification layer 3, a cathode interface modification layer 5 is provided on the upper surface of the active layer 4, a cathode 6 is provided on the upper surface of the cathode interface modification layer 5, a plurality of longitudinally arranged isolation layers 7 are provided on the substrate 1, the isolation layers 7 penetrate the TCO layer 2, the anode interface modification layer 3, the active layer 4 and the cathode interface modification layer 5, isolation gaps 61 are provided on both sides of the cathode 6, and a cover plate 8 is provided above the cathode 6.

[0039] It should be noted that the top of the isolation layer 7 is flush with the top of the cathode interface modification layer 5. The cover plate 8 is adhered to the substrate 1 by UV glue 9.

[0040] In addition, the thickness of the anode interface modification layer 3 is 20-100 nm, the thickness of the active layer 4 is 50-300 nm, and the thickness of the cathode interface modification layer 5 is 1-50 nm. Preferably, the thickness of the anode interface modification layer 3 is 50 nm, the thickness of the active layer 4 is 120 nm, and the thickness of the cathode interface modification layer 5 is 10 nm.

[0041] The manufacturing method of this embodiment is described below. The preparation process comprises the following steps:

[0042] Step S1: providing a transparent substrate as a substrate 1, and depositing a transparent oxide conductive film, namely a TCO layer 2, on the transparent substrate;

[0043] Step S2: making an anode TCO pattern by imaging etching;

[0044] Step S3: forming a barrier layer 7 by photoresist coating and exposure;

[0045] Step S4: preparing the anode interface modification layer 3 by inkjet printing and performing a curing operation;

[0046] Step S5: preparing the active layer 4 by inkjet printing and performing a curing operation;

[0047] Step S6: preparing the cathode interface modification layer 5 by inkjet printing and performing a curing operation;

[0048] Step S7: evaporating the cathode to obtain the cathode 6. During cathode evaporation, all organic layers are wrapped in the barrier layer by the cathode in the vacuum chamber, which can better isolate water and oxygen and enhance the stability of the organic layer.

[0049] Step S8: Packaging: in a nitrogen environment, using UV glue 9, the cover plate 8 is bonded to the substrate 1 .

[0050] As shown in Figures 6 and 7, five organic solar cell structures are connected in series, and a display screen can be installed in the central visible area S. In Figure 6, the anode pattern M1 can be seen. In Figure 7, the cathode pattern M2 can be seen.

[0051] Each cell is separated by a barrier layer 7, and each barrier layer 7 forms a closed pattern in each single solar cell. The inner and outer rings of each organic cell have exposed anodes, and the inner and outer rings of the organic layer in the anode area are simultaneously connected to the next negative electrode, effectively reducing the series resistance of the positive electrode. The organic solar cell structure based on inkjet printing has a simple manufacturing process and provides a single-cell or multi-cell series device structure for wearable products.

[0052] Example 2

[0053] The structure of the organic solar cell based on inkjet printing provided in Example 1 is further optimized. Specifically, as shown in FIG. 4 , a desiccant layer 10 is provided on the inner wall of the cover plate 8 .

[0054] It should be noted that the desiccant layer 10 is separated from the cathode 6 by a preset isolation distance D. The isolation distance D is 5-10 nm. Preferably, the isolation distance D is 7 nm.

[0055] The working mode of this embodiment is described below.

[0056] The desiccant layer 10 can effectively absorb water vapor in the sealing structure of the cover plate 8, thereby preventing the cathode 6 from rusting and causing circuit disconnection, thereby effectively improving the reliability of the organic solar cell structure.

[0057] Example 3

[0058] The structure of the organic solar cell based on inkjet printing provided in Example 1 or 2 is further optimized. Specifically, as shown in FIG. 5 , an extension portion 71 is provided on the top of the isolation layer 7 , and the extension portion 71 fills the isolation gap 61 .

[0059] The working mode of this embodiment is described below.

[0060] By utilizing the extended portion 71 , the leakage current between the cathode 6 and the anode interface modification layer 3 can be further reduced, thereby further improving the performance of the organic solar cell.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. An organic solar cell structure based on inkjet printing, characterized in that: The organic solar cell structure based on inkjet printing comprises a substrate (1), a TCO layer (2) is provided on the upper surface of the substrate (1), an anode interface modification layer (3) is provided on the upper surface of the TCO layer (2), an active layer (4) is provided on the upper surface of the anode interface modification layer (3), a cathode interface modification layer (5) is provided on the upper surface of the active layer (4), a cathode (6) is provided on the upper surface of the cathode interface modification layer (5), a plurality of longitudinally arranged isolation layers (7) are provided on the substrate (1), the isolation layers (7) penetrate the TCO layer (2), the anode interface modification layer (3), the active layer (4) and the cathode interface modification layer (5), isolation gaps (61) are provided on both sides of the cathode (6), and a cover plate (8) is provided above the cathode (6).

2. The organic solar cell structure based on inkjet printing according to claim 1, characterized in that: The top of the isolation layer (7) is flush with the top of the cathode interface modification layer (5).

3. The organic solar cell structure based on inkjet printing according to claim 1, characterized in that: The thickness of the anode interface modification layer (3) is 20 to 100 nm, the thickness of the active layer (4) is 50 to 300 nm, and the thickness of the cathode interface modification layer (5) is 1 to 50 nm.

4. The organic solar cell structure based on inkjet printing according to claim 3, characterized in that: The thickness of the anode interface modification layer (3) is 50 nm, the thickness of the active layer (4) is 120 nm, and the thickness of the cathode interface modification layer (5) is 10 nm.

5. The organic solar cell structure based on inkjet printing according to claim 1, characterized in that: A desiccant layer (10) is provided on the inner side wall of the cover plate (8).

6. The organic solar cell structure based on inkjet printing according to claim 1, characterized in that: The cover plate (8) is bonded to the substrate (1) via UV glue (9).

7. The organic solar cell structure based on inkjet printing according to claim 5, characterized in that: The desiccant layer (10) is separated from the cathode (6) by a preset isolation distance (D).

8. The organic solar cell structure based on inkjet printing according to claim 7, characterized in that: The isolation distance (D) is 5 to 10 nm.

9. The organic solar cell structure based on inkjet printing according to claim 8, characterized in that: The isolation distance (D) is 7 nm.

10. The organic solar cell structure based on inkjet printing according to claim 1, characterized in that: An extension portion (71) is provided on the top of each of the isolation layers (7), and the extension portion (71) fills the isolation gap (61).

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