KR20100104552A - Dye sensitized solar cell module and method of preparing the same - Google Patents

Abstract

PURPOSE: A module is manufactured in the formation of the manufacturing method thereof silver conductor connecting electrode and dye sense solar cell module without the formation of the separate insulating protective layer. CONSTITUTION: The upper plate including catalyst pole substrates(10a, 20a, 30) is prepared. The lower plate including functional pole substrates(10b, 20b, 50) is prepared. It faces to the top and bottom and the functional pole substrate and catalyst pole substrate are arranged. The electrolyte(40) is filled between the functional pole substrate and catalyst pole substrate.

Description

Dye-Sensitized Solar Cell Module and Manufacturing Method Thereof {DYE SENSITIZED SOLAR CELL MODULE AND METHOD OF PREPARING THE SAME}

The present invention relates to a dye-sensitized solar cell module and a method for manufacturing the same, and more particularly, it is possible to manufacture a solar cell module in a very simple process than the conventional manufacturing process, in particular in the Z-type direct type solar cell module, Compared with the conventional Ag paste, defect rate can be reduced, uniform contact state can be formed between cells, and a module can be manufactured without forming an insulating protective layer in forming a conductor connecting electrode between cells. In addition, the present invention relates to a dye-sensitized solar cell module and a method of manufacturing the same, which can reduce the line width of the connection electrode part, thereby increasing cell density.

Since the development of the dye-sensitized nanoparticle titanium oxide solar cell by the team of Michael Gratzel of the Swiss National Lausanne Institute of Advanced Technology (EPFL) in 1991, much work has been done in this area. Dye-sensitized solar cells have the potential to replace conventional amorphous silicon solar cells because their manufacturing cost is significantly lower than conventional silicon-based solar cells. Unlike silicon solar cells, dye-sensitized solar cells absorb visible light It is a photoelectrochemical solar cell mainly composed of a dye molecule capable of generating electron-hole pairs and a transition metal oxide that transfers generated electrons.

The unit cell structure of a general dye-sensitized solar cell is based on a conductive transparent electrode made of an upper and lower transparent substrate (generally glass) and a transparent conductive oxide (TCO) formed on the surface of the transparent substrate, respectively. On the conductive transparent electrode on one side corresponding to the working electrode), a transition metal oxide porous layer on which the dye is adsorbed is formed, and on the other conductive transparent electrode corresponding to the second electrode (catalyst), the catalyst thin film electrode ( Mainly Pt) is formed, and an electrolyte is filled between the transition metal oxide, for example, TiO ₂ , a porous electrode (working electrode substrate) and a catalyst thin film electrode (catalyst electrode substrate). That is, a dye-sensitized solar cell supplies electrons to an oxidized dye between a working electrode substrate coated with a dye-attached photoelectrode (TiO ₂ ) material that receives electrons and generates a electron and a catalytic electrode substrate supplying electrons. It is composed based on electrolyte.

However, the unit cell of the dye-sensitized solar cell is configured in a module form in which a plurality of cells are integrated for practical use, and among the integration methods for such modularization, FIG. 1 (Z-type direct method is illustrated). As shown in.) It may have a configuration such that the electrical connection is made between the opposing substrates facing each other between neighboring cells.

As such, the wiring connecting the upper substrate and the lower substrate to flow electricity between neighboring cells is conventionally formed by applying Ag paste to each of the upper substrate and the lower substrate and overlapping them. There is a problem in that contact resistance is generated and a uniform contact between cells cannot be formed, which causes a failure rate of the module.

In addition, since a metal conductor such as Ag is oxidized by reacting with an electrolyte, there is a problem in that an insulating protective layer should be formed around the connection electrode as shown in FIG. 1 to prevent this. The process becomes more complicated with the formation of the insulating protective layer (generally, glass frit is applied to a corresponding part, and after joining the upper and lower plates, a process of locally melting and bonding the frit is performed by irradiating a laser to these coating areas. .) There is a problem that the defective rate is increased, and the line width of the connection electrode portion is increased, thereby lowering the density of the module.

Therefore, there is an urgent need to develop a dye-sensitized solar cell module and a method of manufacturing the same that improve the above-described problems.

In order to solve the problems of the prior art as described above, the present invention can manufacture a solar cell module in a very simple process than the conventional manufacturing process, in particular in the Z-type direct type solar cell module, using a conventional Ag paste Compared to the case, the failure rate can be reduced, uniform contact state can be formed between the cells, and in the formation of the conductor connection electrode between cells, a module can be manufactured without forming an insulating protective layer. It is an object of the present invention to provide a dye-sensitized solar cell module and a method for manufacturing the same, which can reduce the line width and increase cell density.

In order to achieve the above object, the present invention

In the dye-sensitized solar cell module is formed by the integration of a plurality of cells comprising a working electrode substrate and a catalytic electrode substrate disposed up and down facing each other, and the electrolyte filled between these substrates,

Neighboring cells of the cell are connected such that an electrical connection is made between opposite substrates,

The electrical connection is inserted between the opposing substrates, dye-sensitized solar cell, characterized in that the insulating resin film material is made of a film in which the conductive particles dispersed in the gap of the overlapping portion of the opposing substrate is formed to form an electrical connection Provide a module.

Also,

In the manufacturing method of the dye-sensitized solar cell module formed by the integration of a plurality of cells comprising a working electrode substrate and a catalytic electrode substrate disposed up and down facing each other, and an electrolyte filled between these substrates,

Preparing an upper plate on which a cathode electrode substrate is formed;

Preparing a lower plate on which a working electrode substrate is formed such that a part of the working electrode substrate facing the neighboring cell is overlapped from the catalyst electrode substrate;

Bonding the upper and lower plates by inserting a film in which conductive particles are dispersed in an insulating resin film material between the opposingly overlapping substrates; And,

It provides a method of manufacturing a dye-sensitized solar cell module comprising the step of coupling so that the gap of the overlapping portion of the opposite substrate having a size smaller than or equal to the conductive particles to make an electrical connection.

According to the dye-sensitized solar cell module of the present invention and a manufacturing method thereof. The solar cell module can be manufactured in a much simpler process than the conventional fabrication process. Especially, in the Z-type direct type solar cell module, the defect rate can be reduced compared to the case of using a conventional Ag paste, and the uniformity between cells is achieved. It is possible to form a contact state, and in the formation of a conductor connecting electrode between cells, it is possible to manufacture a module without forming a separate insulating protective layer, thereby reducing the line width of the connecting electrode part, thereby increasing the cell density. You can get it.

Hereinafter, the present invention will be described in detail.

The dye-sensitized solar cell module of the present invention includes the working electrode substrates 10b, 20b, 50 and the catalytic electrode substrates 10a, 20a, 30 disposed upside down and an electrolyte 40 filled between these substrates. A dye-sensitized solar cell module in which a plurality of cells are formed integrally with each other, the neighboring cells of the cells being connected to each other such that electrical connections are made between substrates facing each other; The electrical connection is interposed between the opposing substrates, and the film 90 in which the conductive particles 94 are inserted into the insulating resin film material 92 at intervals of overlapping portions of the opposing substrates to form an electrical connection. Has a configuration.

Detailed description thereof will be described with reference to the accompanying drawings.

That is, in the case where a plurality of dye-sensitized solar cell unit cells are combined to form a module, the concept of the present invention is applied when an electrical connection is made between an upper plate and a lower plate, as shown in FIGS. 1 and 2. Dye formed by integrating a plurality of cells including the working electrode substrates 10b, 20b, 50 and the catalytic electrode substrates 10a, 20a, 30 disposed opposite to each other, and an electrolyte 40 filled between these substrates. In a sensitized solar cell module, it applies to a module having a structure in which neighboring cells of the cell are connected to make electrical connections between substrates facing each other.

The electrical connection is inserted between the opposing substrates as shown in FIG. 2, and conductive particles 94 are inserted into the insulating resin film material 92 at intervals of overlapping portions of the opposing substrates to form an electrical connection. The dispersed film 90 is applied and connected. In the case of FIG. 2, although the thickness is much smaller than the width of each cell at the actual size, in order to clearly show the cross-sectional structure, the up and down direction is abnormally enlarged so that the film part is shown as a pillar, and the actual shape is shown in FIG. In the case of 3 to 5, the form becomes closer. (Of course, these drawings are also abnormally enlarged.)

In the integrated structure of the module, preferably, the dye-sensitized solar cell module has a catalytic electrode substrate formed thereon, a working electrode substrate formed below, and an electrical connection from the catalytic substrate to the working electrode substrate of the neighboring cell. It is preferable that it is a dye-sensitized solar cell module of a Z-type direct method. Through this, a battery generating a high voltage can be obtained, and the present invention can solve the low integration degree, which is a disadvantage of the Z-type, thereby increasing the effect.

The electrical connection between the upper plate and the lower plate by the introduction of the film is made by conductive particles sandwiched between them to form an electrical connection, the attack of the conductive particles from the electrolyte is carried out by the insulating resin film material, a separate protective layer Formation of the connection electrode and the protective layer is carried out at the same time only by attaching the film and pressing / heating the bonding process. Therefore, the process is simple and automation is easy.

The insulating resin film material may be applied to a conventional insulating resin material, and preferably a resin that requires a heating temperature (typically around 150 ° C.) that does not cause thermal damage to other components in the bonding process. It is good that it is a resin material which is durable and does not receive damage to an electrolyte as much as possible. Specific examples thereof include Surlyn film, vinel film, or epoxy.

In addition, the conductive particles 94 may be any particles having conductivity, and preferably metal powder particles, conductive polymer particles, or particles coated with a conductor on insulating resin particles may be applied thereto.

In addition, an example of an insulating film 90 in which the conductive particles are dispersed may include an anisotropic conductive film (ACF).

The ACF may be applied to various conventional ACFs, and the conductive particles used therein are usually coated with a conductive metal (gold, nickel or a multilayer coating thereof) on resin particles such as polymers, and polymers on the outer surface thereof. Is resin coated particles.

Since the gap between the opposing substrates of the dye-sensitized solar cell is usually maintained at 20 to 100 μm, the thickness of the film applied here is preferably 25 to 80 μm in consideration of the deformation of the bonding process, and is dispersed therein. It is preferable that the magnitude | size of the electroconductive particle used becomes 20-100 micrometers. In addition, in the case of using the solid electrolyte, the photoelectric conversion efficiency increases as the distance between the opposing substrates is maintained at 20 μm or less, so the size of the conductive particles is preferably lower than this. As shown in FIG. 3, the film is inserted into the overlapping portion of the opposing substrate, and when heated and pressed, both substrates are brought into close contact with each other and electrically connected through conductive particles (in the case of particles larger than the gap, Electrical connection with deformation) is made, and the adhesion between the substrates is also made.

In this case, since the width of the film is about 1 mm, a remarkable improvement is made as compared with the line width of the connection electrode portion of about 3 mm that the conventional Z-type dye-sensitized solar cell module has.

In addition, in order to secure a gap between the counter substrates at all times when the upper plate and the lower plate are pressed during the bonding process, the film 90 further includes spacer 98 particles having a size smaller than or equal to that of the conductive particles 94. can do. Here, the spacer particles may correspond to various particles such as an insulator, a conductor, or a semiconductor. Preferably, the spacer particles are particles having a melting point higher than a temperature heated in the bonding process of the film, and more preferably, a resin has a glass transition temperature. It is preferable that the insulator is a particle higher than the temperature heated in the bonding process of the film, and as a result, the spacer serves to maintain the gap in the bonding process, as shown in FIG.

In addition, as described above, in order to further reduce the film width in order to increase the degree of integration, it is necessary to reduce the size of the conductive particles, and in order to form a combination of the upper plate and the lower plate with the above configuration, the substrate facing in this case The spacing between them should be reduced. However, if the spacing between the opposing substrates is reduced too much, it is difficult to secure a space for filling the electrolyte. Thus, without reducing the overall substrate spacing, as shown in the specific example of FIG. 5, any one of the overlapping portions of the opposing substrates. May further include a protrusion projecting toward the other side. A plurality of protrusions may be arranged horizontally as shown, or a plurality of protrusions may be disposed from the top to the bottom of the drawing (the direction going through the ground). Through this, a thinner line width of 100 µm can be obtained.

In addition, the present invention provides a method for manufacturing a module as described above, which includes a working electrode substrate (10b, 20b, 50) and a catalytic electrode substrate (10a, 20a, 30) and these substrates disposed facing up and down Claims [1] A method for manufacturing a dye-sensitized solar cell module, in which a plurality of cells including an electrolyte 40 filled therebetween are formed, the method comprising the steps of: preparing an upper plate on which a catalyst electrode substrate is formed; Preparing a lower plate on which a working electrode substrate is formed such that a part of the working electrode substrates of neighboring cells overlaps with each other from the catalytic electrode substrate; Bonding the upper plate and the lower plate to each other by inserting a film 90 having conductive particles 94 dispersed in an insulating resin film material 92 between the oppositely overlapping substrates; And coupling the gaps of the overlapping portions of the opposing substrates to have a size smaller than or equal to that of the conductive particles 94 so that an electrical connection is made.

Specific examples thereof are as shown in FIGS. 3 to 5, and the film applied thereto may preferably be an anisotropic conductive film as described above, and the conductive particles may also be described above. As described above, the metal powder particles, the conductive polymer particles, or the insulating resin particles may be coated with a conductor, and as shown in FIG. 5, the film may have a spacer having a size smaller than or equal to that of the conductive particles. spacer) may further include particles to allow the top and bottom plate to be bonded at a uniform interval. This is replaced by the above description in the detailed description.

The present invention described above is not limited to the above detailed description and examples, and various modifications and changes of those skilled in the art are possible without departing from the spirit and scope of the present invention as set forth in the claims below. Of course it is also included within the scope of the present invention.

1 is a view showing a cross-sectional structure of an embodiment of a conventional Z-type dye-sensitized solar cell module.

2 is a view showing a cross-sectional structure of an embodiment of the dye-sensitized solar cell module of the present invention.

3 is an enlarged cross-sectional view illustrating an embodiment of a process of a method of manufacturing a dye-sensitized solar cell module of the present invention.

Figure 4 is an enlarged cross-sectional view showing another embodiment of the process of the manufacturing method of the dye-sensitized solar cell module of the present invention.

5 is an enlarged cross-sectional view of another embodiment of a process of the method of manufacturing a dye-sensitized solar cell module of the present invention.

Explanation of symbols on the main parts of the drawings

10a: upper glass substrate (top plate) (catalyst pole) 10b: lower glass substrate (bottom plate) (working pole)

20a: Top surface TCO layer (catalyst pole) 20b: Bottom surface TCO layer (working pole)

30: catalyst layer (catalyst electrode, mainly Pt) 40: electrolyte

50: dye + transition metal oxide layer 60: encapsulation

70: connecting electrode 80: insulating film (protective layer)

90: (ACF) film 92: insulating resin film material

94: conductive particle 96: protrusion (conductor)

98: spacer particles

Claims (10)

In the dye-sensitized solar cell module is formed by the integration of a plurality of cells comprising a working electrode substrate and a catalytic electrode substrate disposed up and down facing each other, and the electrolyte filled between these substrates, Neighboring cells of the cell are connected such that an electrical connection is made between opposite substrates, The electrical connection is inserted between the opposing substrates, dye-sensitized solar cell, characterized in that the insulating resin film material is made of a film in which the conductive particles dispersed in the gap of the overlapping portion of the opposing substrate is formed to form an electrical connection module. The method of claim 1, The dye-sensitized solar cell module is a Z-type direct type dye-sensitized, in which a catalytic electrode substrate is formed on an upper portion, a working electrode substrate is formed on a lower portion thereof, and an electrical connection is made from the catalytic electrode substrate to a working electrode substrate of a neighboring cell. Dye-sensitized solar cell module, characterized in that the solar cell module. The method of claim 1, The film is a dye-sensitized solar cell module, characterized in that the anisotropic conductive film (Anisotropic Conductive Film). The method of claim 1, The conductive particles are metal powder particles, conductive polymer particles, or dye-sensitized solar cell module, characterized in that the conductive coating particles to the insulating resin particles. The method according to claim 3 or 4, The film is a dye-sensitized solar cell module, characterized in that it further comprises a spacer particle of the same size or smaller than the conductive particles. The method of claim 1, The dye-sensitized solar cell module, characterized in that any one of the overlapping portion of the opposing substrate further comprises a protrusion protruding toward the opposite side. In the manufacturing method of the dye-sensitized solar cell module formed by the integration of a plurality of cells comprising a working electrode substrate and a catalytic electrode substrate disposed up and down facing each other, and an electrolyte filled between these substrates, Preparing an upper plate on which a cathode electrode substrate is formed; Preparing a lower plate on which a working electrode substrate is formed such that a part of the working electrode substrate facing the neighboring cell is overlapped from the catalyst electrode substrate; Bonding the upper and lower plates by inserting a film in which conductive particles are dispersed in an insulating resin film material between the opposingly overlapping substrates; And, The method of manufacturing a dye-sensitized solar cell module comprising the step of coupling so that the gap of the overlapping portion of the opposite substrate having a size smaller than or equal to the conductive particles to make an electrical connection. The method of claim 7, wherein The method of manufacturing a dye-sensitized solar cell module, characterized in that the film is an anisotropic conductive film. The method of claim 7, wherein The conductive particles are metal powder particles, conductive polymer particles, or a method of manufacturing a dye-sensitized solar cell module, characterized in that the conductive coating particles to the insulating resin particles. 10. The method according to claim 8 or 9, The film is a method of manufacturing a dye-sensitized solar cell module, characterized in that it further comprises a spacer particle of the same size or smaller than the conductive particles.

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