KR101356034B1 - Organic Solar Cell Module Manufacturing Method and Organic Solar Cell Module Manufactured therefrom - Google Patents

Abstract

A method of manufacturing an organic solar cell module according to the present invention includes forming a first electrode of a first unit cell and a first electrode of a second unit cell spaced apart from each other on a substrate; Forming a separation protrusion on a portion of each of the first electrodes; Forming a photoelectric conversion layer on each of the first electrodes, and discharging the material forming the photoelectric conversion layer obliquely from one side to form the photoelectric conversion layer in only one direction from one point on the separation protrusion; And forming a second electrode on each of the photoelectric conversion layers, and discharging the material forming the second electrode obliquely from the opposite side to the first electrode of the first unit cell. And forming the second electrode to be in contact with the second electrode.

Description

Organic Solar Cell Module Manufacturing Method and Organic Solar Cell Module Manufactured Thereby {Organic Solar Cell Module Manufacturing Method and Organic Solar Cell Module Manufactured therefrom}

The present invention relates to an organic solar cell module manufacturing method and an organic solar cell module produced thereby.

The present invention is derived from a study conducted as part of a renewable energy technology development project of the Ministry of Knowledge Economy and Korea Institute of Energy Research. [Project name: Development of original technology for manufacturing flexible see-through thin film solar cell module]

With the recent depletion of existing energy sources such as oil and coal, interest in alternative energy sources to replace them is increasing. Among them, solar energy is attracting particular attention because it has abundant energy resources and there is no problem about environmental pollution.

The photovoltaic module that converts sunlight into electrical energy has a junction structure of a p-type semiconductor and an n-type semiconductor like a diode, and when light is incident on the photovoltaic module, the interaction between the light and the material constituting the semiconductor of the photovoltaic module The action produces negatively-charged electrons and positively-charged holes, which cause current to flow as they move.

In recent years, interest in organic solar cells using an organic light absorbing material that can be manufactured in a thin film with a low cost process and is applicable to various fields has been increasing.

In general, an organic solar cell includes a substrate, a positive electrode, a hole transport layer, an organic photoelectric conversion layer that converts photons into holes and electrons, an electron transport layer, and a negative electrode And the like. And the electrodes of these organic solar cells are connected to each other to increase the overall voltage to form a module structure.

In a situation where an organic solar cell is becoming large in area, there is a need for a technology capable of easily and simply integrating an organic solar cell module.

Korean Publication No. 10-2009-0019596 (2009.02.25)

An object of the present invention is to provide an organic solar cell manufacturing method and an organic solar cell module manufactured thereby, which can be easily and easily integrated to solve the problems of the prior art described above.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the description of the present invention .

A method of manufacturing an organic solar cell module according to an aspect of the present invention includes forming a first electrode of a first unit cell and a first electrode of a second unit cell spaced apart from each other on a substrate; Forming a separation protrusion on a portion of each of the first electrodes; Forming a photoelectric conversion layer on each of the first electrodes, and forming the photoelectric conversion layer in only one direction from one point on the separation protrusion; And forming a second electrode on each of the photoelectric conversion layers, wherein the second electrode is formed such that the second electrode of the second unit cell contacts the first electrode of the first unit cell.

According to an embodiment of the present invention, the forming of the photoelectric conversion layer may be performed by obliquely emitting the material forming the photoelectric conversion layer from one side.

According to an embodiment of the present invention, the forming of the second electrode may be performed by releasing the material forming the second electrode at an angle from the opposite side of the one side.

An organic solar cell module according to an embodiment of the present invention includes a substrate and a plurality of unit cells on the substrate, each of the plurality of unit cells comprising: a first electrode; A separation protrusion on a portion of the first electrode; A photoelectric conversion layer for converting light into electricity on the first electrode; And a second electrode on the photoelectric conversion layer, wherein the first electrode of the first unit cell and the second electrode of the second unit cell adjacent to the first unit cell are electrically connected among the plurality of unit cells.

According to the present invention, a method of manufacturing an organic solar cell module that can be easily integrated by forming a photoelectric conversion layer and a second electrode in a similar manner without patterning through gradient deposition and an organic solar cell module manufactured thereby Can be provided.

1 illustrates an organic solar cell module integrated according to an embodiment of the present invention.
2a to 2d illustrate a manufacturing process of an organic solar cell module according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The shape and the size of the elements in the drawings may be exaggerated for clarity of explanation and the same reference numerals are used for the same elements and the same elements are denoted by the same quote symbols as possible even if they are displayed on different drawings Should be. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention.

1 shows an integrated organic solar cell module according to an embodiment of the present invention. As shown in FIG. 1, an integrated organic solar cell module according to an exemplary embodiment of the present invention includes a substrate 100, a first electrode 210, a photoelectric conversion layer 220, and a second electrode 230. .

An integrated organic solar cell module according to an embodiment of the present invention includes a plurality of unit cells, each unit cell 200 of the first electrode 210, the photoelectric conversion layer 220 and the second electrode 230 Include. In this case, each unit cell 200 is connected in series with an adjacent unit cell. That is, the first electrode 210 of one unit cell may be in contact with and electrically connected to the second electrode 230 of an adjacent unit cell.

In addition, the organic solar cell module according to the embodiment of the present invention may further include a separation protrusion 300 on the first electrode. By further including the separation protrusion 300 as described above, integration of the organic solar cell module may be facilitated.

Hereinafter, a manufacturing process of an organic solar cell module in which a plurality of unit cells are connected in series, that is, integrated in an easy and simple manner, will be described with reference to the accompanying drawings.

2a to 2d illustrate a manufacturing process of an organic solar cell module according to an embodiment of the present invention.

As shown in FIG. 2A, a plurality of first electrodes 210 spaced apart from each other is formed on the substrate 100.

The substrate 100 may include glass, a transparent material such as polyethylene terephthalate (PET), and polyethylene naphthalate (PEN), or an opaque material such as a stainless steel sheet. When the solar cell module according to the embodiment of the present invention performs photoelectric conversion using light incident through the substrate 100 side, the substrate 100 may include a transparent material. When the organic solar cell module according to the embodiment of the present invention performs photoelectric conversion by using light incident through the opposite side of the substrate, the substrate 100 may include an opaque material. In addition, when the solar cell module according to the present invention is a see-through type, the substrate 100, the first electrode 210, and the second electrode 230 may all include a transparent material.

The first electrode 210 may be a transparent electrode including a transparent material such as indium tin oxide (ITO), carbon nanotube (CNT), or graphene. When the organic solar cell module according to the embodiment of the present invention performs photoelectric conversion by light irradiated from the second electrode 230 side, the first electrode 210 may be an opaque electrode.

Since each of the plurality of first electrodes 210 constitutes different unit cells, the plurality of first electrodes 210 must be spaced apart from each other to prevent a short circuit between the unit cells. The first electrodes 210 spaced apart from each other may be formed by first forming a first electrode material on the substrate 100 and then patterning the first electrode material. Alternatively, the plurality of first electrodes 210 may be formed using a mask or may be formed using a printing based technique. For example, the patterned first electrode 210 may include vacuum deposition using a shadow mask, inkjet printing, roll to roll, doctor blading, and the like. And spray (Spray).

As shown in FIG. 2B, a separation protrusion 300 is formed on a portion of each first electrode. The separation protrusion 300 is a means for allowing the photoelectric conversion layer 220 and the second electrode 230 to be formed later to be formed only at a required position through gradient deposition. Accordingly, it is possible to manufacture a large-area organic solar cell module without going through a patterning process using a mask for the photoelectric conversion layer 220 and the second electrode 230 later.

The separation protrusion 300 may be formed by fluid dispensing, inkjet printing, screen printing, roll to roll, doctor blading or aerosol printing. It may be formed in the same manner as, but is not limited thereto. In this case, the separation protrusion 300 may include a material such as a UV resin, an epoxy resin, or a photoresist that may serve as an insulator among the materials that can be used in the above-described forming method. have. In addition, by using a scattering material capable of scattering light in such materials, the light entering the separation protrusion 300 may be scattered to increase light absorption efficiency, thereby contributing to improvement of solar cell efficiency.

The contact angle between the formed separation protrusion 300 and the horizontal plane (for example, the horizontal first electrode surface) may have various values depending on the forming method and the forming conditions. The contact angle with respect to the horizontal plane of the separation protrusion 300 refers to the angle formed by the tangent line and the horizontal line of the separation protrusion at the point where the horizontal line and the separation protrusion contact in the cross section of the separation protrusion. When the liquid substance is used when forming the separation extractor 300, the contact angle is changed by the difference in the surface energy of the solution and the surface energy of the first electrode 210. When the surface energy of the solution is determined, the contact angle of the separation derivation unit 300 suitable for the purpose may be formed by changing the surface energy on the surface of the substrate 100 through surface treatment.

In addition, when depositing a specific material, depositing perpendicular to the horizontal plane means that it has a radiation angle of 90 °, and obliquely depositing means that it deposits at a radiation angle smaller than 90 °. Under this definition, it is preferable that the contact angle of the formed separation protrusion 300 has a larger value than the radiation angle θ1 of the photoelectric conversion layer 220 and the radiation angle θ2 of the second electrode 230.

As shown in FIG. 2C, the photoelectric conversion layer 220 is formed on each of the first electrodes 210 through gradient deposition. When the material forming the photoelectric conversion layer is radiated obliquely at a predetermined angle θ1 from the repair on the surface of the substrate 100, the photoelectric conversion layer 220 is continuously formed between adjacent unit cells by the separation protrusion 300. Can be formed spaced apart from each other. To this end, when the material forming the photoelectric conversion layer 220 is obliquely radiated from one side of the substrate, a deposition method having straightness may be used. For example, a deposition method such as an electron beam, thermal deposition, spraying, or sputtering using a material forming a photoelectric conversion layer as a source or a target may be used, but is not limited thereto.

Accordingly, the photoelectric conversion layer 220 may be formed only in one direction from one point on the separation protrusion 300. In this case, the photoelectric conversion layer 220 should not completely cover the first electrode 210 of the same unit cell in a different direction of the one point on the separation protrusion 300. That is, in FIG. 2C, the photoelectric conversion layer 220 of each unit cell is formed only at the left side from one point on the separation protrusion 300. Therefore, the photoelectric conversion layer 220 does not cover the first electrode 210 of the same unit cell on the right side of the separation protrusion 300.

As such, the angle θ1 at which the material forming the photoelectric conversion layer is obliquely radiated may be determined to form the photoelectric conversion layer 220 at a required position. The photoelectric conversion layer 220 may be formed at a required position on the first electrode by adjusting the angle θ1 according to the shape and position of the separation protrusion 300.

The photoelectric conversion layer 220 may be formed in a double layer structure including a light absorption type organic semiconductor layer made of a material having a high light absorption rate and an electron accepting type organic semiconductor layer positioned on the organic semiconductor layer. In addition, the photoelectric conversion layer 220 may include a bulk type in which a light absorption type organic semiconductor material and an electron acceptor type organic semiconductor material are mixed at a predetermined ratio. In addition, the photoelectric conversion layer 220 is a PIN type photoelectric conversion in which a P-type doping hole collection layer, a light absorption type and electron accepting organic semiconductor layer, and an N-type doping electron collection layer is sequentially stacked It may comprise a layer. In some embodiments, the photoelectric conversion layer 220 may include an N-I-P type photoelectric conversion layer. In this case, the light absorption semiconductor may include a material such as pentacene (Pentacene), CuPC (Copper Phthalocyanine), SubPC (Subphthalocyanine) having a large light absorption coefficient. As the electron accepting material, a material such as fullerene may be used.

As shown in FIG. 2D, a second electrode 230 is formed on each photoelectric conversion layer 220 through oblique deposition. When the material forming the second electrode 230 is radiated obliquely at a predetermined angle θ2 from the repair of the surface of the substrate 100, the second electrode 230 is disposed between adjacent unit cells by the separation protrusion 300. It is not formed continuously, but formed spaced apart from each other. To this end, when the material forming the second electrode 230 is obliquely radiated from the other side of the substrate, a deposition method having straightness may be used. For example, an electron beam, a thermal deposition, a spray, or a sputtering method using a material forming the second electrode 230 as a source or a target may be used, but is not limited thereto.

Here, the second electrodes 230 included in each unit cell need to be spaced apart from each other. However, the second electrode 220 should be positioned so that the second electrode of one unit cell contacts the first electrode of another adjacent unit cell for series connection between unit cells. The material forming the second electrode 230 may be emitted from the opposite side from which the material forming the photoelectric conversion layer 220 is emitted. According to the position and shape of the separation protrusion 300, the position at which the second electrode 230 is formed may be adjusted by adjusting the radiated angle θ2.

For example, as illustrated in FIG. 2D, the second electrode 230 of one unit cell is formed to be in contact with a portion not covered by the photoelectric conversion layer 220 as the first electrode 210 of the adjacent unit cell. . Accordingly, a series connection is made between adjacent unit cells to operate as a module.

The second electrode 230 may include materials such as aluminum (Al), silver (Ag), and gold (Au) to reflect the back surface. In some embodiments, the second electrode 230 may include a transparent material such as indium tin oxide (ITO), carbon nano tube (CNT), or graphene. In addition, the second electrode 230 may be formed of a single layer or a plurality of layers according to the embodiment.

As described above, according to the exemplary embodiment of the present invention, the photoelectric conversion layer 220 and the second electrode 230 are formed in the same manner as the photoelectric conversion layer 220 and the second electrode 230 without patterning using a mask through the separation protrusion 300 and the gradient deposition. Can be.

Conventionally, patterning has been performed using a mask such as a shadow mask when fabricating an organic solar cell module. However, the deflection phenomenon of a large area mask has been an obstacle when fabricating a large area element. Accordingly, according to an embodiment of the present invention, a method of manufacturing a large-area organic solar cell module using only the separation protrusion 300 and the inclined deposition without using a mask that generates such a problem, and an organic solar cell module manufactured thereby Can provide.

In addition, according to an embodiment of the present invention it is also possible to manufacture a flexible organic solar cell module in a roll-to-roll manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

100: substrate
210: first electrode 220: photoelectric conversion layer
230: second electrode 300: separation protrusion

Claims (6)

Forming a first electrode of a first unit cell and a first electrode of a second unit cell spaced apart from each other on a substrate;
Forming a separation protrusion on a portion of each of the first electrodes;
Forming a photoelectric conversion layer on each of the first electrodes, and discharging the material forming the photoelectric conversion layer obliquely from one side to form the photoelectric conversion layer in only one direction from one point on the separation protrusion; And
A second electrode is formed on each of the photoelectric conversion layers, and the material forming the second electrode is obliquely emitted from the opposite side to the first electrode of the first unit cell. Forming the second electrode to be in contact with the second electrode;
Organic solar cell module manufacturing method. delete delete The method of claim 1,
The forming of the separation protrusion may include: an organic solar cell module module manufacturing method characterized in that the solution is discharged, inkjet printing, screen printing, roll-to-roll, doctor blading or aerosol printing is performed. delete delete

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