KR20120079213A - Solar cell module - Google Patents

Abstract

PURPOSE: A solar cell module is provided to reduce connection error between solar cells by forming a first inter-connector and a second inter-connector with a flexible printed circuit. CONSTITUTION: A first inter-connector(200) electrically connects two solar cells(100) arranged on a same string. The first inter-connector is arranged as the same direction with the string. A second inter-connector(300) electrically connects two solar cells arranged on different strings. The second inter-connector is arranged as the orthogonal direction to the first inter-connector thereof. The first inter-connector and the second inter-connector are separately arranged between the solar cells electrically connected to each other.

Description

Solar cell module {SOLAR CELL MODULE}

The present invention relates to a solar cell module having a plurality of solar cells.

Recently, as the depletion of existing energy resources such as oil and coal is predicted, interest in alternative energy to replace them is increasing, and solar cells are attracting attention accordingly.

A solar cell converts solar energy into electrical energy using a photoelectric conversion effect. One solar cell produces a small power of about several V. Therefore, in order to obtain the desired output, several solar cells are connected in series or in parallel, and a waterproof solar cell module is used.

In the solar cell module, in order to output the power generated by the solar cell to the outside, a conductor such as an interconnector connected to the anode and the cathode of the solar cell, for example, is connected to the outside of the solar cell module by connecting with a lead wire, and the lead wire is terminated. A method of drawing a current through a power line of a terminal box by connecting to the is used.

In the solar cell module of such a configuration, the lead wire is disposed outside the region where the solar cell is installed in the solar cell panel. Therefore, since an area for arranging the lead wires is required, the solar cell panel must secure an invalid portion that does not contribute to power generation, and there is a problem in that the size of the solar cell panel, and thus the solar cell module, increases due to the invalid portion. .

The present invention is to provide a solar cell module that can reduce the size of the solar cell module by reducing the invalid portion.

A solar cell module according to an embodiment of the present invention is a solar cell module having a plurality of strings formed by electrically connecting a plurality of solar cells arranged in a row, comprising two solar cells arranged in the same string A first interconnector for electrically connecting; And at least one second interconnector electrically connecting two solar cells arranged in different strings, wherein the first interconnector and the second interconnector are respectively located in a space between solar cells electrically connected to each other. do.

The first interconnector is located in the same first direction as the string, and the second interconnector is located in a second direction crossing the first direction.

The first interconnector may be formed of a flexible printed circuit (FPC) or a strip-shaped ribbon, and the second interconnector may also be formed of a flexible printed circuit (FPC) or a strip-shaped ribbon.

The two solar cells electrically connected by the second interconnector may be formed in the same structure.

In one example, two solar cells electrically connected by a second interconnector each include a first electrode located on one side of the substrate and a second electrode located on the other side of the substrate, the first electrode being a It includes a plurality of front electrodes extending in parallel in one direction and a plurality of front electrode current collector disposed in a direction crossing the front electrode, the second electrode may be made of a rear electrode located on the entire other side of the substrate. .

In this case, one solar cell of the two solar cells electrically connected by the second interconnector is arranged such that the front electrode current collector is positioned in the second direction, and the other solar cell is the front electrode current collector. May be arranged to be positioned in the first direction.

In another example, the two solar cells electrically connected by the second interconnector each include a first electrode located on one side of the substrate and a second electrode located on the other side of the substrate. A plurality of front electrode and a plurality of front electrode current collector which is located in a direction crossing the front electrode and a plurality of front electrodes extending side by side in any one direction, the second electrode for a plurality of rear electrodes located in a direction parallel to the front electrode It may include a rear electrode electrically connected to the current collector and the current collector for the rear electrode.

At this time, one solar cell of the two solar cells electrically connected by the second interconnector is arranged such that the current collector for the front electrode is located in the first direction, the other solar cell is the front electrode collector All may be arranged to be located in the second direction.

Alternatively, the two solar cells electrically connected by the second interconnector may be formed in different structures.

In this case, one of the two solar cells electrically connected by the second interconnector comprises a first electrode located on one side of the substrate and a second electrode located on the other side of the substrate, The first electrode includes a plurality of front electrodes extending in parallel in one direction and a plurality of front electrode current collectors positioned in a direction intersecting the front electrodes, and the second electrode includes a rear electrode located on the entire rear surface of the substrate. Can be.

Alternatively, one of the two solar cells electrically connected by the second interconnector includes a first electrode located on one side of the substrate and a second electrode located on the other side of the substrate, The first electrode includes a plurality of front electrodes extending in parallel in one direction and a plurality of front electrode current collectors positioned in a direction crossing the front electrodes, and the second electrode includes a plurality of front electrodes located in a direction parallel to the front electrodes. The rear electrode may include a current collector for the rear electrode and a rear electrode electrically connected to the current collector for the rear electrode.

According to this feature, a second interconnector for electrically connecting two solar cells arranged in different strings is located in the space between the solar cells.

Therefore, the void spaces respectively provided on the upper side and the lower side of the solar cell module in order to electrically connect two solar cells arranged in different strings can be significantly reduced than in the related art.

For example, solar cells arranged in the same string are electrically connected by using a ribbon of bands, and two solar cells arranged in different strings are connected by using a ribbon of ribbons or lead wires. An invalid space portion having a width of about 9 cm must be formed on the upper side and the lower side of the module, respectively, but the solar cell module of the present embodiment can form the invalid space portion each having a width of about 1 cm.

In addition, when the first interconnector and the second interconnector are formed of a flexible printed circuit, connection defects between solar cells can be reduced due to excellent ductility compared to the existing ribbon.

1 is a plan view of a solar cell module according to a first embodiment of the present invention.
FIG. 2 is a perspective view of an essential part showing a first embodiment of a solar cell included in the solar cell module shown in FIG. 1.
3 is a perspective view of an essential part showing a second embodiment of a solar cell provided in the solar cell module shown in FIG.
4 is a perspective view of an essential part showing a third embodiment of a solar cell included in the solar cell module shown in FIG.
5 is a plan view of a solar cell module according to a second embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In order to clearly illustrate the present invention in the drawings, portions not related to the description are omitted, and like reference numerals are given to similar portions throughout the specification.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. When a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case directly above another portion but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

An embodiment of the present invention will now be described with reference to the accompanying drawings.

1 is a plan view of a solar cell module according to a first embodiment of the present invention, Figures 2 to 4 is a perspective view of the main part according to the first to third embodiments of the solar cell shown in FIG.

Referring to the drawings, a solar cell module according to an embodiment of the present invention includes a plurality of solar cells 100.

Although not shown, the solar cell module is disposed on a protective layer (EVA) to protect the solar cells 100, a transparent member disposed on the protective layer toward the light receiving surface of the solar cells 100, and a lower portion of the protective film opposite to the light receiving surface. It further comprises a back sheet of opaque material, a frame for accommodating the components integrated by a lamination process, and a junction box for collecting power generated from solar cells.

The rear sheet protects the solar cells 100 from the external environment by preventing moisture from penetrating at the rear of the solar cell module. Such back sheet may have a multi-layered structure such as a layer that prevents moisture and oxygen penetration, a layer that prevents chemical corrosion, and a layer having insulating properties.

The protective film is integrated with the solar cells 100 by a lamination process in a state disposed above and below the solar cells 100, thereby preventing corrosion due to moisture penetration and protecting the solar cells 100 from impact. . The protective film may be made of a material such as ethylene vinyl acetate (EVA).

The transparent member located on the protective film is made of tempered glass having a high transmittance and excellent breakage preventing function. In this case, the tempered glass may be a low iron tempered glass having a low iron content. Such a transparent member may be embossed on its inner surface to enhance light scattering.

The plurality of solar cells 100 provided in the solar cell module are arranged in the form of a plurality of strings. Here, the string refers to the electrically connected in a state in which a plurality of solar cells are arranged in a line.

Therefore, the solar cell module shown in FIG. 1 includes four strings, for example, the first to fourth strings S1, S2, S3, and S4.

The plurality of solar cells 100 arranged in the respective strings S1-S4 are electrically connected by the first interconnector 200 and the second interconnector 300.

In the present embodiment, the first interconnector 200 and the second interconnector 300 are each formed of a flexible printed circuit (FPC).

The flexible printed circuit forming the first interconnector 200 and the second interconnector 300 has a structure in which a conductive layer is positioned inside the protective film. At this time, since both ends of the conductive layer must be in contact with the electrodes of the solar cell, the protective film is not located at both ends of the conductive layer.

In addition, both ends of the conductive layer are exposed to opposite sides, respectively, facing in different directions. The conductive layer may be formed as a single film.

Since the flexible printed circuit having such a structure can be easily implemented by those skilled in the art, detailed description thereof will be omitted.

More specifically for the structure in which the plurality of solar cells 100 are electrically connected to each other, one string, for example, disposed adjacent to each other in the first direction (Y-Y ') in the first string (S1). The plurality of solar cells 100 are electrically connected to each other by a first interconnector 200 formed of a flexible printed circuit and cross each other in a second direction X-X 'that crosses the first direction Y-Y'. Solar cells 100 of different strings disposed adjacent to each other are electrically connected by a second interconnector 300 formed of a flexible printed circuit.

In this case, the plurality of solar cells 100 may all be formed in the same structure, alternatively, some of the solar cells of the plurality of solar cells may be formed in a different structure from the remaining solar cells.

When the plurality of solar cells 100 are all formed in the same structure, as shown in FIG. 2, the solar cell 100 is located at the light receiving surface of the substrate 110 and the substrate 110 to which light is incident. The anti-reflection film 140 located on the emitter unit 120, the first electrode 130 positioned on the emitter unit 120, the emitter unit 120 in the region where the first electrode 130 is not located, and the opposite side of the light receiving surface A back surface field (BSF) part 150 positioned on the surface and a second electrode 160 positioned on the back side of the back field part 150 are included.

In the present exemplary embodiment, the first electrode 130 is a plurality of front electrodes 132 extending side by side in one direction and a plurality of front electrodes positioned on the emitter portion 212 in a direction crossing the front electrodes 132. The current collector 134 is included, and the second electrode 160 includes a rear electrode 162 positioned on the entire rear surface of the rear electric field unit 150.

The substrate 110 is a semiconductor substrate made of silicon of a first conductivity type, for example a p-type conductivity type. In this case, the silicon may be monocrystalline silicon, polycrystalline silicon, or amorphous silicon. When the substrate 110 has a p-type conductivity type, it contains impurities of trivalent elements such as boron (B), gallium (Ga), indium (In), and the like.

Although not shown, one surface of the substrate 110 on which the emitter portion 120 is located, for example, the light receiving surface, may be formed as a texturing surface including a plurality of irregularities.

When the light receiving surface of the substrate 110 is formed as a texturing surface, the light reflectivity at the light receiving surface is reduced, and incident and reflection operations are performed at the texturing surface, thereby increasing light absorption. Thus, the efficiency of the solar cell is improved.

The emitter unit 120 is a region doped with impurities having a second conductivity type, for example, an n-type conductivity type, which is opposite to the conductivity type of the substrate 110. To form a junction.

When the emitter part 120 has an n-type conductivity type, the emitter part 120 may include impurities of pentavalent elements such as phosphorus (P), arsenic (As), and antimony (Sb) on the light receiving surface of the substrate 110. It can be formed by doping.

Accordingly, when electrons in the semiconductor receive energy by light incident on the substrate 110, the electrons move toward the n-type semiconductor and the holes move toward the p-type semiconductor. Therefore, when the substrate 110 is p-type and the emitter portion 120 is n-type, the separated holes move toward the substrate 110 and the separated electrons move toward the emitter portion 120.

In contrast, the substrate 110 may be of an n-type conductivity type, and may be made of a semiconductor material other than silicon. When the substrate 110 has an n-type conductivity type, the substrate 110 may contain impurities of pentavalent elements such as phosphorus (P), arsenic (As), and antimony (Sb).

Since the emitter part 120 forms a p-n junction with the substrate 110, when the substrate 110 has an n-type conductivity type, the emitter part 120 has a p-type conductivity type. In this case, the separated electrons move toward the substrate 110 and the separated holes move toward the emitter part 120.

When the emitter section 120 has a p-type conductivity type, the emitter section 120 is formed by doping an impurity of a trivalent element such as boron (B), gallium (Ga), indium (In) .

The anti-reflection film 140 positioned on the emitter portion 212 of the substrate 110 may prevent reflection of silicon nitride film (SiNx), silicon oxide film (SiO ₂ ), silicon oxynitride film (SiOxNy), titanium dioxide film (TiO ₂ ), and the like. At least one film selected from materials.

The anti-reflection film 140 increases the efficiency of the solar cell 100 by reducing the reflectance of light incident on the solar cell 100 and increasing selectivity of a specific wavelength region. The anti-reflection film 140 may have a thickness of about 70 nm to 80 nm, and may be omitted as necessary.

The plurality of front electrodes 132 are formed on the emitter unit 120 to be electrically connected to the emitter unit 120, and are formed in one direction in a state in which the front electrodes 132 are spaced apart from each other. Each front electrode 132 collects charges, for example, electrons, which are moved toward the emitter unit 120, and transfers them to the current collector 134 for the front electrode.

The front electrode 132 includes nickel (Ni), copper (Cu), silver (Ag), aluminum (Al), tin (Sn), zinc (Zn), indium (In), titanium (Ti), and gold (Au) And at least one conductive material selected from the group consisting of a combination thereof.

The plurality of front electrode current collectors 134, also called bus bars, are formed in a direction crossing the front electrode 132. Accordingly, the front electrode 132 and the front electrode current collector 134 are disposed to intersect the emitter unit 120.

Although FIG. 2 illustrates one front electrode current collector 134, typically, two to three front electrode current collectors 134 are provided in one solar cell.

The front electrode current collector 134 includes nickel (Ni), copper (Cu), silver (Ag), aluminum (Al), tin (Sn), zinc (Zn), indium (In), titanium (Ti), and gold. It is made of at least one conductive material selected from the group consisting of Au and combinations thereof, and is connected to the emitter portion 120 and the front electrode 132. Accordingly, the current collector 134 for the front electrode outputs electric charge, for example, electrons transferred from the front electrode 132 to an external device.

The front electrode current collector 134 may be formed of the same material as the front electrode 132, but may be formed of a material different from that of the front electrode 132.

The front electrode 132 and the front electrode current collector 134 apply a conductive metal material on the anti-reflection film 140 and then, during the firing process, an etching component contained in the conductive metal material etches the anti-reflection film 140. As described above, the emitter unit 120 may be electrically connected to the emitter unit 120.

The back surface field part 150 is a region in which impurities of the same conductivity type as the substrate 110 are doped at a higher concentration than the substrate 110, for example, a p + region.

The rear electric field 150 serves as a potential barrier at the rear of the substrate 110. Therefore, the electrons and holes are recombined and extinguished in the rear side of the substrate 110, thereby improving the efficiency of the solar cell.

The second electrode 160 positioned at the rear of the rear electric field 150 collects charges, for example, holes, moving toward the substrate 110. In this embodiment, the second electrode 160 is located at the entire rear of the rear electric field 150. The rear electrode 162 is included.

The back electrode 162 is made of at least one conductive material. Conductive materials include nickel (Ni), copper (Cu), silver (Ag), aluminum (Al), tin (Sn), zinc (Zn), indium (In), titanium (Ti), gold (Au) and their It may be at least one selected from the group consisting of a combination, but may be made of other conductive materials.

Therefore, the rear electrode 162 outputs the electric charge transferred from the rear electric field unit 150 to an external device.

The plurality of solar cells provided in the solar cell module may be the solar cell 100 according to the first embodiment described above.

As illustrated in FIG. 1, the solar cells 100 of this configuration are electrically connected to each other by the first interconnector 200 and the second interconnector 300, and electrical connection between adjacent solar cells 100 may be performed. Among the adjacent solar cells, the front electrode current collector 134 of one solar cell and the rear electrode 162 of the other solar cell among the adjacent solar cells are connected to the first interconnector 200 or the second interconnector 300. Electrical connection according to the connection.

In particular, the electrical connection between adjacent solar cells 100 arranged in the same string is made by the first interconnector 200 located in the space between the adjacent solar cells, adjacent solar cells ( Electrical connections between the 100 are made by a second interconnector 300 located in the space between adjacent solar cells.

In order for electrical connection between adjacent solar cells 100 arranged in different strings, for example, the first string S1 and the second string S2, to be made by the second interconnector 300, Among the solar cells arranged in one string S1, the solar cell positioned at the bottom thereof is arranged such that the front electrode current collector 134 is positioned in the second direction X-X ′.

Accordingly, one end of the second interconnector 300 is electrically connected to the front electrode current collector 134 of the solar cell positioned at the bottom of the first string S1, and the second interconnector 300 is electrically connected. The other end may be electrically connected to the rear electrode 162 of the solar cell located at the bottom of the second string S1.

That is, since it is possible to position the second interconnector 300 in the space between the solar cell located at the bottom of the first string (S1) and the solar cell located at the bottom of the second string (S2), The void space at the lower side of the battery module can be reduced.

The electrical connection between both ends of the second interconnect and the electrode may be applied by applying a conductive adhesive paste to the conductive layer exposed on both ends of the second interconnect, followed by pressing while heating to a predetermined temperature, for example, a temperature of 100 ° C. Can be done accordingly.

On the other hand, the front electrode current collector 134 is located in the first direction (Y-Y ') of all the solar cells except the solar cells located below the plurality of solar cells arranged in the first string (S1). Adjacent solar cells are electrically connected by a first interconnector 200 located in the space between the cells.

Similarly, one solar cell among the solar cells positioned above the second string S2 and the third string S3 is the same as the solar cell positioned below the first string S1. The whole 134 is arranged to be located in the second direction X-X '.

Since electrical connection of adjacent solar cells arranged in different strings is performed as described above, description of electrical connection of adjacent solar cells arranged in the third string S3 and the fourth string S4 is omitted.

In the above, the solar cell 100 and its electrical connection structure when the plurality of solar cells 100 are all formed in the same structure have been described.

Alternatively, some of the solar cells of the plurality of solar cells may be formed in a different structure from the other solar cells.

As an example of this case, the lower solar cells of the first string S1 and the third string S2 and the upper solar cell of the second string S2 are the solar cells 100A shown in FIG. 3. ), And the remaining solar cells may be formed of the solar cell 100 shown in FIG. 2.

The solar cell 100A shown in FIG. 3 differs from the solar cell 100 shown in FIG. 2 in that a plurality of rear electrode current collectors 164A electrically connected to the rear electrode 162A include a rear electric field unit ( It is further located on the rear side of 150A, and the current collector 164A for the rear electrode is located in a direction parallel to the front electrode 132A.

In FIG. 3, the components corresponding to those of FIG. 2 are illustrated by adding "A" after the reference numerals, and therefore, the description of the components corresponding to the components of FIG. 2 will be omitted.

As such, the lower solar cells of the first string S1 and the third string S2 and the upper solar cell of the second string S2 are formed of the solar cell 100A shown in FIG. When the cells are made of the solar cell shown in FIG. 2, the solar cells 100A are arranged such that the current collector 134A for the upper electrode is positioned in the second direction X-X ′, and the solar cells 100 are upper The electrode collector 134 is arranged to be positioned in the first direction Y-Y '.

Therefore, adjacent solar cells arranged in different strings can also be easily connected by the second interconnector 300 located in the space between the solar cells.

On the contrary, the lower solar cells of the second string S2 and the fourth string S4 and the upper solar cell of the third string S3 are formed of the solar cell 100A, and the remaining solar cells are illustrated in FIG. 2. It may be made of a solar cell 100 shown in.

In this case, the solar cell 100A is arranged such that the front electrode current collector 132A is positioned in the first direction (Y-Y '), and the lower side of the first string S1 and the third string S3. The solar cells on the upper side of the cells 100 and the second string S2 are arranged such that the front electrode current collector 132 is positioned in the second direction (X-X '), and the remaining solar cells 100 are front The electrode collector 132 is arranged to be positioned in the first direction Y-Y '.

Another example of a case in which some solar cells are formed in a structure different from the other solar cells among the plurality of solar cells will be described. The solar cells and the lower solar cells of the first string S1 to the fourth string S4 may be described. The upper solar cell of the second string S2 and the third string S3 may be formed of the solar cell 100A shown in FIG. 3, and the remaining solar cells may be formed of the solar cell 100B shown in FIG. 4. .

The solar cell 100B shown in FIG. 4 differs from the solar cell 100 shown in FIG. 2 in that a plurality of rear electrode current collectors 164B electrically connected to the rear electrode 162B include a rear electric field unit ( It is further located on the rear side of 150B, and the rear electrode current collector 164B is located in a direction parallel to the front electrode current collector 134B.

In FIG. 4, the components corresponding to those of FIG. 2 are illustrated by adding “B” after the reference numerals, and thus descriptions of the components corresponding to FIG. 2 will be omitted.

As described above, the lower solar cells of the first string S1 to the fourth string S4 and the upper solar cells of the second string S2 and the third string S3 are illustrated in FIG. 3. 100A) and the remaining solar cells of the solar cell illustrated in FIG. 4, the lower strings of the solar cells 100A and the second string S2 of the first string S1 and the third string S3. The upper solar cell 100A is arranged such that the upper electrode current collector 134A is positioned in the second direction X-X ', and the lower solar cell of the second string S2 and the fourth string S4. 100A and the upper solar cell 100A of the third string S3 are arranged such that the upper electrode current collector 134A is positioned in the first direction (Y-Y '), and the remaining solar cells 100B. Both are arranged such that the upper electrode current collector 134B and the lower electrode current collector 164B are positioned in the first direction (Y-Y ').

Meanwhile, in the above-described embodiment, the first interconnector 200 and the second interconnector 300 formed of the flexible printed circuit have been described as an example. However, as shown in FIG. 200A and the second interconnect 300A can also be used.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

100, 100A, 100B: solar cell 200: first interconnector
300: second interconnector

Claims (14)

A solar cell module having a plurality of strings formed by electrically connecting a plurality of solar cells arranged in a row.
A first interconnector for electrically connecting two solar cells arranged in the same string; And
At least one second interconnector electrically connecting two solar cells arranged in different strings
Including;
And the first interconnector and the second interconnector are respectively located in a space between solar cells electrically connected to each other. In claim 1,
And the first interconnector is positioned in the same first direction as the string, and the second interconnector is positioned in a second direction crossing the first direction. In claim 2,
The second interconnector is a solar cell module formed of a flexible printed circuit (FPC) or a strip-shaped ribbon. In claim 2,
The first interconnector is a solar cell module formed of a flexible printed circuit (FPC) or a strip of ribbon. The method of claim 3 or 4,
Two solar cells electrically connected by the second interconnector are formed in the same structure with each other. The method of claim 5,
The two solar cells electrically connected by the second interconnector each include a first electrode located on one side of the substrate and a second electrode located on the other side of the substrate,
The first electrode includes a plurality of front electrodes extending in parallel in one direction and a plurality of front electrode current collectors positioned in a direction crossing the front electrodes,
The second electrode is a solar cell module consisting of a rear electrode located on the entire other side of the substrate. The method of claim 6,
One solar cell of two solar cells electrically connected by the second interconnector is arranged such that the current collector for the front electrode is positioned in the second direction. In claim 7,
The other solar cell of the two solar cells electrically connected by the second interconnector is arranged so that the current collector for the front electrode is located in the first direction. The method of claim 5,
The two solar cells electrically connected by the second interconnector each include a first electrode located on one side of the substrate and a second electrode located on the other side of the substrate,
The first electrode includes a plurality of front electrodes extending in parallel in one direction and a plurality of front electrode current collectors positioned in a direction crossing the front electrodes,
The second electrode includes a plurality of rear electrode current collectors disposed in a direction parallel to the front electrode and a rear electrode electrically connected to the rear electrode current collector. The method of claim 9,
One solar cell of two solar cells electrically connected by the second interconnector is arranged such that the front electrode current collector is positioned in the first direction. 11. The method of claim 10,
The other solar cell of the two solar cells electrically connected by the second interconnector is arranged so that the current collector for the front electrode is located in the second direction. The method of claim 3 or 4,
2. The solar cell module of claim 2, wherein the two solar cells electrically connected by the second interconnector are formed in different structures. The method of claim 12,
One solar cell of two solar cells electrically connected by the second interconnector includes a first electrode located on one side of a substrate and a second electrode located on the other side of the substrate,
The first electrode includes a plurality of front electrodes extending in parallel in one direction and a plurality of front electrode current collectors positioned in a direction crossing the front electrodes,
The second electrode is a solar cell module consisting of a rear electrode located on the entire rear of the substrate. The method of claim 12,
One solar cell of two solar cells electrically connected by the second interconnector includes a first electrode located on one side of a substrate and a second electrode located on the other side of the substrate,
The first electrode includes a plurality of front electrodes extending in parallel in one direction and a plurality of front electrode current collectors positioned in a direction crossing the front electrodes,
The second electrode includes a plurality of rear electrode current collectors disposed in a direction parallel to the front electrode and a rear electrode electrically connected to the rear electrode current collector.

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