KR101661766B1

KR101661766B1 - Solar cell panel

Info

Publication number: KR101661766B1
Application number: KR1020100069961A
Authority: KR
Inventors: 이기원; 김종환; 강주완; 이경수; 하만효; 장대희
Original assignee: 엘지전자 주식회사
Priority date: 2010-07-20
Filing date: 2010-07-20
Publication date: 2016-09-30
Also published as: KR20120009680A

Abstract

A solar cell panel includes a plurality of solar cells; A light-transmissive front substrate disposed on a front surface of the solar cells; And a light transmissive rear substrate disposed on a rear surface of the solar cells, wherein a first transparent conductive pattern for electrically connecting adjacent solar cells is located on the inner surface of the light transmissive rear substrate facing the rear surface of the solar cells .

Description

Solar Cell Panel {SOLAR CELL PANEL}

The present invention relates to a solar cell panel.

Photovoltaic generation, which converts light energy into electrical energy using the photoelectric conversion effect, is widely used as means for obtaining pollution-free energy. With the improvement of the photoelectric conversion efficiency of the solar cell, a solar power generation system using a plurality of solar cell modules is also installed in a private house.

A solar cell panel having a plurality of solar cells generated by solar light includes a protection member disposed at upper and lower portions of the solar cell to protect the solar cell from external environment such as external impact and moisture.

In general, a solar cell panel uses a sheet of opaque material as a lower protective member. In recent years, however, a light-transmitting substrate is used as the lower protective member to secure the light-transmitting property, or the lower surface of the solar cell is utilized as a light incidence surface Technology is being developed.

Disclosure of Invention Technical Problem [8] The present invention provides a solar cell panel with improved light-shielding and appearance.

According to an aspect of the present invention, a solar cell panel includes a plurality of solar cells; A light-transmissive front substrate disposed on a front surface of the solar cells; And a light transmissive rear substrate disposed on a rear surface of the solar cells, wherein a first transparent conductive pattern for electrically connecting adjacent solar cells is located on the inner surface of the light transmissive rear substrate facing the rear surface of the solar cells .

The light-transmitting rear substrate is made of a conductive resin including conductive glass or polyethyleneterephthalate (PET), and the first transparent conductive pattern is a transparent conductive oxide film formed on one side of the conductive glass or conductive resin (Transparent Conductive Oxide, TCO).

The light transmissive front substrate may be made of low iron tempered glass or may be made of a conductive resin including conductive glass or polyethyleneterephthalate (PET).

In the case where the light-transmitting front substrate is made of low iron tempered glass, the solar cell includes a semiconductor substrate and a first current collector and a second current collector located on the rear surface of the semiconductor substrate, and between the front surface of the solar cells and the light- A rear protective film may be disposed between the rear surface of the solar cells and the light-transmitting rear substrate.

When the light-transmitting front substrate is made of conductive glass or a conductive resin, the solar cell includes a semiconductor substrate, a first current collector positioned on the front surface of the semiconductor substrate, and a second current collector located on the rear surface of the semiconductor substrate, A second transparent conductive pattern for electrically connecting adjacent solar cells is located on the inner surface of the light transmissive front substrate facing the front surface of the cells.

At this time, the first transparent conductive pattern and the second transparent conductive pattern are electrically connected to each other by a bonding portion including an electrically conductive adhesive material at an extended portion of the solar cell, and between the front surface of the solar cells and the transparent front substrate A front passivation layer may be positioned between the rear surface of the solar cells and the light transmissive rear substrate.

According to this feature, since the electrical connection between adjacent solar cells is made by a transparent conductive pattern, the photovoltaic property and appearance of the solar cell panel can be improved.

1 is a schematic exploded perspective view of a solar cell panel according to an embodiment of the present invention.
Fig. 2 is a partial cross-sectional view of the solar cell panel shown in Fig. 1, before the lamination process is performed.
3 is a plan view of the light-transmitting rear substrate of the solar cell panel shown in FIG.
4 is a partial perspective view of a solar cell for rear surface bonding.
5 is a cross-sectional view of the solar cell shown in FIG. 4 cut along the line VV.
6 is a partial cross-sectional view of a solar cell panel according to another embodiment of the present invention.
7 is a plan view of a light-transmissive rear substrate according to the embodiment of FIG.
8 is a plan view of a light-transmissive front substrate according to the embodiment of FIG.
9 is a partial perspective view of the solar cell according to the embodiment of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. 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. In addition, when a part is formed as "whole" on another part, it includes not only the part formed on the entire surface (or the entire surface) of the other part but also the part not formed on the edge part.

Hereinafter, a solar cell panel according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic exploded perspective view of a solar cell panel according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of the solar cell panel shown in FIG. 1 and is a sectional view before a lamination process is performed, 1 is a plan view of the light-transmitting rear substrate of the solar cell panel shown in Fig.

The solar cell panel according to the present embodiment includes a plurality of solar cells 100, protective films 20a and 20b for protecting the plurality of solar cells 100, a protective film (hereinafter, (Hereinafter referred to as a 'rear protective film') 20b disposed on the opposite side of the light-receiving surface, and a light-transmitting rear substrate (hereinafter referred to as a rear protective film) 40).

The light transmissive front substrate 30 located on the light receiving surface side is made of tempered glass having high transmittance. At this time, the tempered glass may be a low iron tempered glass having a low iron content. The light-transmissive front substrate 30 may be embossed on the inner side to enhance the light scattering effect.

The upper and lower protective films 20a and 20b prevent corrosion of the metal due to moisture penetration and protect the solar cell 100 from impact. The upper and lower protective films 20a and 20b are integrated with the plurality of solar cells 100 by a lamination process in a state where the upper and lower protective films 20a and 20b are disposed on the upper and lower sides of the solar cell 100, respectively.

The protective films 20a and 20b may be made of ethylene vinyl acetate (EVA), polyvinyl butyral, ethylene vinyl acetate partial oxide, silicon resin, ester resin, olefin resin, or the like.

The plurality of solar cells 100 are arranged in a matrix structure. In FIG. 1, a plurality of solar cells 100 have a 3 × 2 matrix structure, but the number of solar cells 100 arranged in row and column directions is not limited thereto.

Each of the plurality of solar cells 100 has the same structure. In this embodiment, each solar cell 100 has an electron collecting portion, which is a terminal for outputting electrons to the outside, and a terminal And a collector for collecting solar cells are all located on the rear surface of the solar cell 100. FIG.

Next, with reference to Figs. 4 and 5, such a rear-bonding solar cell will be described.

FIG. 4 is a partial perspective view of a rear-bonding solar cell, and FIG. 5 is a cross-sectional view of the solar cell shown in FIG. 4 cut along the line V-V.

4 and 5, a solar cell 100 includes a substrate 110 having a plurality of via holes 181, an emitter section 120 disposed on the substrate 110, An antireflection film 130 located on the emitter section 120 on the front side of the substrate 110 and a plurality of front electrodes 130 located on the emitter section 120 of the front surface of the substrate 110 on which the antireflection film 130 is not disposed a back electrode 151 positioned on the back surface of the substrate 110 and a back electrode 151 located on the back surface of the substrate 110 disposed around the via hole 181 and the via hole 181. [ A plurality of front electrode current collectors 161 located at the emitter section 120 and electrically connected to the plurality of front electrodes 141 and a plurality of front current collector sections 161 electrically connected to the rear electrodes 151, A back electrode current collector 162 and a back surface field (BSF) portion 171 located between the back electrode 151 and the substrate 110. [

The substrate 110 is a semiconductor substrate of a first conductivity type, for example, silicon of p-type conductivity type. Here, the silicon may be a single crystal silicon, a polycrystalline silicon substrate, or an amorphous silicon.

When the substrate 110 has a p-type conductivity type, it contains an impurity of a trivalent element such as boron (B), gallium, indium, or the like. Alternatively, however, the substrate 110 may be of the 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), antimony (Sb), and the like.

Such a substrate 110 has a texturing surface whose surface is textured.

The emitter portion 120 formed on the substrate 110 is an impurity portion having a second conductivity type, for example, an n-type conductivity type opposite to the conductivity type of the substrate 110, Junction.

Due to the built-in potential difference due to the pn junction, the electron-hole pairs, which are charges generated by the light incident on the substrate 110, are separated into electrons and holes, electrons move toward the n- Moves toward the p-type.

Therefore, when the substrate 110 is p-type and the emitter section 120 is n-type, the separated holes move toward the substrate 110, and the separated electrons move toward the emitter section 120. Therefore, in the substrate 110, holes become majority carriers, and in the emitter section 120, electrons become majority carriers.

Unlike the present embodiment, when the substrate 110 has an n-type conductivity type, the emitter portion 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 an n-type conductivity type, the emitter section 120 dopes impurities of pentavalent elements such as phosphorus (P), arsenic (As), antimony (Sb) A dopant of a trivalent element such as boron (B), gallium (Ga), or indium (In) may be doped into the substrate 110 when the emitter section 120 has a p-type conductivity type .

The antireflection film 130 formed on the emitter layer 120 on the entire surface of the substrate 110 is formed of a silicon nitride film (SiNx) or a silicon oxide film (SiOx). The antireflection film 130 reduces the reflectivity of light incident on the solar cell 100 and increases the selectivity of a specific wavelength region to increase the efficiency of the solar cell 100. The antireflection film 130 may have a multi-layer structure such as a single film structure or a double film, and may be omitted if necessary.

The antireflection film 130 and the lower emitter 120 are formed with exposed portions (not shown) exposing a part of the edge of the front surface of the substrate 110. Accordingly, the emitter section 120 formed on the front surface of the substrate 110 and the emitter section 120 formed on the rear surface of the substrate 110 are electrically separated by the exposed section.

The plurality of front electrodes 141 are located on the emitter section 120 formed on the front surface of the substrate 110 and electrically and physically connected to the emitter section 120. The plurality of front electrodes 141 are arranged substantially parallel to each other in a predetermined direction It stretches.

The plurality of front electrodes 141 collect electrons, for example, electrons, which have migrated toward the emitter section 120, and transfer the electrons to the plurality of front electrode current collectors 161 through the via holes 181.

The plurality of front electrodes 141 contain at least one conductive material and examples of these conductive materials include nickel (Ni), copper (Cu), silver (Ag), aluminum (Al), tin Zn), indium (In), titanium (Ti), gold (Au), and combinations thereof, but may be other conductive materials.

The plurality of front electrode current collectors 161 located on the rear surface of the substrate 110 are also referred to as bus bars and are formed of at least one conductive material. The plurality of front electrode current collectors 161 extend substantially in parallel to the plurality of front electrodes 141 located on the front surface of the substrate 110 and have a substantially stripe shape.

4 and 5, a plurality of via holes 181 are formed in a portion of the substrate 110 where a plurality of front electrodes 141 and a plurality of front electrode current collectors 161 cross each other. At least one of the plurality of front electrodes 141 and the plurality of front electrode current collectors 161 extends through at least one of the front surface and the rear surface of the substrate 110 via the plurality of via holes 181, And the plurality of front electrode current collectors 161 are connected to each other. A plurality of front electrodes 141 and a plurality of front electrode current collectors 161 are electrically and physically connected through a plurality of via holes 181. [

The plurality of front electrode current collectors 161 output the electric charges transmitted from the plurality of front electrodes 141 electrically connected to the external device.

The plurality of front electrode current collectors 161 may be formed of Ag, Ni, Cu, Al, Sn, Zn, In, Ti, , Gold (Au), and combinations thereof, or may contain other conductive materials other than the above.

The rear electrode 151 located on the rear surface of the substrate 110 is spaced apart from the adjacent front electrode current collector 161.

The rear electrode 151 is located on substantially the entire rear surface of the substrate 110 except for a portion where the plurality of front electrode current collectors 161 are formed.

The rear electrode 151 collects charges, for example, holes, which move toward the substrate 110.

The emitter section 120 located on the rear surface of the substrate 110 has a plurality of exposed portions 183 exposing a rear portion of the substrate 110 and surrounding the plurality of front electrode current collectors 161.

The electrical connection between the plurality of front electrode current collectors 161 for collecting electrons or holes by the exposed portions 183 and the back electrodes 151 for collecting holes or electrons are broken and the movement of electrons and holes is smooth .

The rear electrode 151 may be formed of a metal such as aluminum (A), nickel (Ni), copper (Cu), silver (Ag), tin (Sn), zinc (Zn), indium (In), titanium (Ti) And combinations thereof, or may contain other conductive materials other than the above.

A plurality of rear electrode current collectors 162 are disposed on the rear surface of the substrate 110 and are electrically and physically connected to the rear electrodes 151. The plurality of front electrode current collectors 162 161, respectively.

Accordingly, the plurality of rear electrode current collectors 162 collect the charges, e.g., holes, transmitted from the rear electrode 151 and output the collected charges to the outside.

The plurality of rear electrode current collectors 162 contain the same material as the plurality of front electrode current collectors 161, for example, a conductive material such as silver (Ag). However, the plurality of the rear electrode current collectors 162 may be formed of a material selected from the group consisting of Ni, Cu, Al, Sn, Zn, In, Ti, ), And combinations thereof, or may contain another conductive material other than the conductive material.

In the present embodiment, the number of the front electrode current collectors 161 is two and the number of the back electrode current collectors 162 is three, but the number of the current collectors may be changed as needed.

The rear electric field portion 171 located between the rear electrode 151 and the substrate 110 is a region where the same conductive type impurity as the substrate 110 is doped at a higher concentration than the substrate 110, for example, a p + region.

The rear electric field portion 171 forms a potential barrier due to a difference in impurity concentration from the substrate 110, thereby hindering electron movement toward the rear surface of the substrate 110. Therefore, the recombination of electrons and holes near the surface of the substrate 110 and the disappearance thereof is reduced.

The solar cell 100 according to this embodiment has a structure in which a plurality of front electrode current collectors 161 connected to a plurality of front electrodes 141 are disposed on the rear surface of a substrate 110, The operation of the solar cell is as follows.

When light irradiated by the solar cell 100 is incident on the semiconductor substrate 110 through the emitter section 120, electron-hole pairs are generated in the semiconductor substrate 110 by light energy. At this time, since the surface of the substrate 110 is a textured surface, the light reflection at the front surface of the substrate 110 is reduced, and the incidence and reflection operations are performed at the textured surface, so that light is trapped inside the solar cell, , The efficiency of the solar cell 100 is improved. In addition, the reflection loss of light incident on the substrate 110 by the anti-reflection film 130 is reduced, and the amount of light incident on the substrate 110 is further increased.

These electron-hole pairs are separated from each other by the pn junction of the substrate 110 and the emitter section 120, electrons move toward the emitter section 120 having the n-type conductivity type, and the holes are made of the p- To the substrate 110 having the first electrode 110a.

Electrons migrated toward the emitter section 120 are collected by the plurality of front electrodes 141 and moved to a plurality of front electrode collectors 161 electrically connected through the plurality of via holes 181, The holes moved toward the rear electrode 110 are collected by the rear electrode 151 through the rear electric portion 171 and moved to the plurality of rear electrode current collectors 162. When the plurality of front electrode current collectors 161 and the plurality of rear electrode current collectors 162 are connected by a conductor, electric current flows and is used as electric power from the outside.

Referring again to FIGS. 1 to 3, the rear protective film 20b located under the plurality of solar cells 100 has a plurality of openings 21. As shown in FIG. The positions of the plurality of openings 21 correspond to the plurality of current collectors 161 and 162 located in the solar cell 100 and at least a part of the current collectors 161 and 162 is exposed through the openings 21 do. At this time, the width of the opening 21 may be smaller than, equal to, or greater than the width of the current collectors 161 and 162.

The light-transmitting rear substrate 40 protects the solar cell 100 from the external environment by preventing moisture from penetrating the rear surface of the solar cell panel. 3, the light-transmitting rear substrate 40 includes a first transparent conductive pattern 41 for electrically connecting the solar cells 100. [

The first transparent conductive pattern 41 is formed on the light-transmitting rear substrate 40. In order to form the first transparent conductive pattern 41 on the light-transmitting rear substrate 40, the transparent rear substrate 40 may be made of a conductive glass having a transparent conductive oxide (TCO) . As another example, the light-transmitting rear substrate 40 may be formed of a conductive resin having a transparent conductive oxide film formed on one side thereof. At this time, a PET resin may be used as the conductive resin.

The transparent rear substrate 40 having the first transparent conductive pattern 41 is formed by forming a transparent conductive oxide film on one side of glass or resin, forming a photoresist film, exposing and developing it, And then patterning the conductive oxide film to form the first transparent conductive pattern.

Another example of forming the light-transmitting rear substrate 40 having the first transparent conductive pattern 41 is to form a photosensitive film on a portion of the glass or resin where the first transparent conductive pattern 41 is not to be formed, It is also possible to manufacture the transparent rear substrate 40 by forming the first transparent conductive pattern 41 by forming the transparent conductive oxide film only on the portion where the photosensitive film is not formed.

The first transparent conductive pattern 41 includes a plurality of front electrode patterns 411 and a plurality of rear electrode collectors 162 that are in contact with a plurality of front electrode collectors 161 formed in each solar cell 100, And a groove 413 for separating the front electrode pattern 411 and the rear electrode pattern 412 from each other. Therefore, the glass or resin 40 is exposed to the portion where the groove 413 is formed.

Each of the patterns 411 and 412 has a sub-branch or protrusion extending in a comb shape in the longitudinal direction from a main branch extending in the lateral direction, Is engaged with the groove 413 therebetween.

At this time, the pair of patterns 411 and 412 corresponding to the same solar cell 100 are electrically insulated from each other by the grooves 413.

In the patterns 411 and 412 corresponding to the two solar cells 100 positioned in the same row and adjacent to each other in the row direction and corresponding to the different current collectors 161 and 162 located in different solar cells 100 The patterns 412 and 411 not connected to each other are connected to different patterns 411 and 412 corresponding to the solar cell 100 positioned before or after the row direction, Lt; / RTI >

In addition, in the patterns 411 and 412 corresponding to the two solar cells 100 located in different rows and adjacent in the column direction in the first column or the last column, The patterns 411 and 412 corresponding to the current collectors 161 and 162 are connected to each other and the patterns 412 and 411 not connected to each other correspond to the solar cells 100 positioned before or after the row direction And are connected to other types of patterns 411 and 412.

In the first transparent conductive pattern 41, the patterns 411 and 412 of different kinds which are not connected to the other types of patterns 411 and 412 are electrically connected to the light-transmitting rear substrate 40 through separate conductors or conductive tapes. Such as a junction box (not shown), disposed on the rear surface (lower surface)

The plurality of front electrode current collectors 161 of each solar cell 100 exposed through the openings 21 of the rear protective film 20b are electrically connected to the front electrode patterns 411 of the first transparent conductive pattern 41 The plurality of rear electrode current collectors 162 of each solar cell 100 exposed through the openings 21 of the rear shielding layer 20b are opposed to the rear electrode patterns of the first transparent conductive pattern 41, (412).

As shown in FIG. 3, the width w1 of the projection of the front electrode pattern 411 is all the same and the width w2 of the projection of the rear electrode pattern 541 is all the same. 3, the width w1 of the protrusion of the front electrode pattern 411 is smaller than the width w2 of the protrusion of the rear electrode pattern 412, but is not limited thereto.

That is, the width w1 of the protrusion of the front electrode pattern 411 and the width w2 of the protrusion of the rear electrode pattern 412 may be equal to each other or the width w1 may be larger than the width w2. The widths w1 and w2 of the projections of the patterns 411 and 412 may be determined according to the number of the front electrode current collector 161 and the rear electrode current collector 162. [

For example, the larger the number of current collectors 161 and 162, the smaller the amount of current flowing through the protrusions of the patterns 411 and 412 is. Therefore, as the amount of the flowing current, that is, the amount of the load, decreases, the width of the protrusions w1 and w2 becomes smaller. The width w1 of the front electrode pattern 411 is larger than the width w1 of the front electrode pattern 411. In this embodiment, the number of the front electrode current collectors 161 is two and the number of the back electrode current collectors 162 is three, Is larger than the width (w2) of the protrusion (412).

2, a conductive adhesive agent 54 is attached on the protrusion of the first transparent conductive pattern 41. The conductive adhesive agent 54 is exposed through the opening 21 of the rear surface protective film 20b And contacts the current collectors 161 and 162.

The projection of the front electrode pattern 411 is electrically connected to the front electrode current collector 161 and the protrusion of the rear electrode pattern 412 is electrically connected to the rear electrode current collector 162 .

The protrusions of the front electrode patterns 411 corresponding to the respective solar cells 100 are connected to each other by the main branches and the protrusions of the rear electrode patterns 412 corresponding to the respective solar cells 100 A plurality of front electrode current collectors 161 located in each solar cell 100 are connected to each other by the front electrode pattern 411 and similarly each solar cell 100 Are connected to each other by a pattern 412 for the rear electrode.

As described above, the connection state of the front electrode pattern 411 and the rear electrode pattern 412 of the first transparent conductive pattern 41 and the formation position of the groove 413 allow the plurality of solar cells 100 ) Are connected in series.

As described above, since the different patterns 411 and 412 of the first transparent conductive pattern 41 are connected to the external device, the electric charge output from the plurality of solar cells 100 connected in series is output to the external device, Flows.

According to this embodiment, a plurality of solar cells 100 are aligned by attaching a conductive adhesive agent 54 on a light-transmitting rear substrate 40 having a first transparent conductive pattern 41, (100) is electrically connected.

That is, the rear protective film 20b is disposed on the light-transmitting rear substrate 40 having the first transparent conductive pattern 41.

Then, a conductive adhesive agent 54 is attached on the first transparent conductive pattern 41 exposed through the opening 21 of the rear protective film 20b, and then a plurality of solar cells 100 are arranged at regular intervals.

Then, the front surface protective film 20a is aligned on the plurality of solar cells 100, and the light-transmitting front substrate 30 is arranged thereon.

Thereafter, a lamination process is performed to integrate these components. That is, according to the lamination process, the light-transmitting front substrate 30, the front surface protecting film 20a, the solar cell 100, the rear surface protecting film 20b, and the light-transmitting rear substrate 40 are joined and integrated, The plurality of front electrode current collectors 161 and the plurality of rear electrode current collectors 162 of the solar cell 100 are electrically connected to the first transparent conductive pattern 41 formed on the light- Respectively.

According to such a panel manufacturing method, since the electrical connecting work between the plurality of solar cells 100 is automatically performed without any manual operation, the panel manufacturing time is reduced and the panel production efficiency is improved.

Hereinafter, a solar cell panel according to another embodiment of the present invention will be described with reference to FIGS. 6 and 9. FIG.

6 is a partial cross-sectional view of a solar cell panel according to another embodiment of the present invention, FIG. 7 is a plan view of a light-transmitting rear substrate according to the embodiment of FIG. 6, FIG. 9 is a partial perspective view of the solar cell according to the embodiment of FIG. 6; FIG.

9, the solar cell 200 used in the solar cell panel of the present embodiment includes a substrate 210, an emitter portion 220 disposed on the front surface of the substrate 210, a plurality A plurality of front electrode current collectors 261, front electrodes 241 and front electrode current collectors 261 located on the emitter unit 220 in a direction intersecting the front electrodes 241, The antireflection film 230 located on the emitter section 220 of the region where the rear electrode 251 is not located, the rear electrode 251 located on the rear surface of the substrate 210, and the rear electrode current collector 262 located on the rear electrode 251 ).

The substrate 210 may be a semiconductor substrate of a first conductivity type, for example, silicon of p-type conductivity type, and may be textured to form a texturing surface.

The emitter portion 220 may be a second conductive type located on the light receiving surface of the substrate 210 on which light is incident and opposite to the conductive type of the substrate 210.

The solar cell 200 used in the solar cell panel of this embodiment has the front electrode current collector 261 and the back electrode current collector 262 located on different surfaces of the substrate 210. [ The front electrode current collector 261 is positioned on the light receiving surface of the substrate 210 and the rear electrode current collector 262 is positioned on the rear surface of the substrate 210,

Accordingly, in order to connect the plurality of solar cells 200 in series, the front electrode current collector 261 of one solar cell must be electrically connected to the current collector 262 for the back electrode of the neighboring solar cell.

For this purpose, a plurality of solar cells are electrically connected by using an interconnector (or ribbon) made of a conductive material.

However, in this embodiment, the first transparent conductive pattern 41 'located on the light-transmitting rear substrate 40' and the second transparent conductive pattern 31 'located on the light-transparent front substrate 30' Connect the battery electrically.

7 and 8, the light-transmitting rear substrate 40 'is made of a conductive glass or a conductive resin having a first transparent conductive pattern 41' The transmissive front substrate 30 'is made of a conductive glass or a conductive resin having a second transparent conductive pattern 31'.

The first transparent conductive pattern 41 'located at the light-transmitting rear substrate 40' is located at a position corresponding to the rear electrode current collector 262 and the second transparent conductive pattern 41 ' The conductive pattern 31 'is located at a position corresponding to the front electrode current collector 261.

At this time, one ends of the first transparent conductive pattern 41 'and the second transparent conductive pattern 31' extend to the outside of the substrate 210, and the first transparent conductive pattern 41 'and the second transparent conductive pattern 31' The directions in which the patterns 31 'extend are opposite to each other. Thus, the extended end of the first transparent conductive pattern 41 'and the extended end of the second transparent conductive pattern 31' are overlapped with a certain size.

Although not shown in detail, the rear protective layer 20b has an opening (not shown) at a position corresponding to the rear electrode current collector 262. The front protective layer 20a corresponds to the front electrode current collector 261 (Not shown) at a position where it is exposed.

The rear passivation layer 20b and the front passivation layer 20a are provided with openings (not shown) at positions where the first transparent conductive pattern 41 'and the second transparent conductive pattern 31' overlap each other. The openings are filled with a conductive adhesive agent.

According to the solar cell panel having such a configuration, the front electrode current collector 261 of any one solar cell (the solar cell located on the right side in Fig. 6) is electrically connected to the second transparent conductive pattern 31 ' And the second transparent conductive pattern 31 'is electrically connected to the first transparent conductive pattern 41' located below the adjacent solar cell (the solar cell located on the left side in FIG. 6) and the conductive adhesive agent 54 And the first transparent conductive pattern 41 'is electrically connected to the rear electrode current collector 262 through the conductive adhesive agent 54. [ Accordingly, a plurality of solar cells 200 are connected in series.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

20a, 20b: protective film 30: light transmitting front substrate
40: light-transmitting rear substrate 41: first transparent conductive pattern
110: substrate 120: emitter portion
130: antireflection film 141: front electrode
151: rear electrode 161: front electrode current collector
162: Current Collector for Rear Electrode 171: Rear Electrode

Claims

A plurality of solar cells each including a first current collector and a second current collector formed on the rear surface of the semiconductor substrate;
A light-transmissive front substrate disposed on a front surface of the solar cells;
A light-transmitting rear substrate located on a rear surface of the solar cells;
A front protective layer disposed between the front surface of the solar cells and the front transparent substrate; And
And a rear protective film which is disposed between the rear surface of the solar cells and the light-transmitting rear substrate and has openings for exposing the first current collector and the second current collector,
A first transparent member having a pattern for connecting the first current collector and the second current collector exposed through the opening to the second current collector and the first current collector of the adjacent solar cell, A solar cell panel having a conductive pattern formed thereon.

The method of claim 1,
Wherein the light-transmitting rear substrate is made of a conductive resin including conductive glass or polyethyleneterephthalate (PET).

The method of claim 1,
Wherein the first transparent conductive pattern comprises a transparent conductive oxide (TCO).

The method of claim 1,
Wherein the light transmissive front substrate is made of low iron tempered glass.

delete

The method of claim 1,
Wherein the light-transmitting front substrate is made of a conductive resin including conductive glass or polyethyleneterephthalate (PET).

A plurality of solar cells each including a first current collector positioned on a front surface of a semiconductor substrate and a second current collector positioned on a rear surface of the semiconductor substrate;
A light-transmissive front substrate disposed on a front surface of the solar cells; And
A light-transmitting rear substrate located on a rear surface of the solar cells;
/ RTI >
A first transparent conductive pattern electrically connected to a second current collector located on a rear surface of the semiconductor substrate is formed on an inner surface of the light-transmitting rear substrate,
And a second transparent conductive pattern electrically connected to the first current collecting part located on the front surface of the semiconductor substrate is formed on the inner surface of the light transmitting front substrate.

delete

9. The method of claim 8,
Wherein the first transparent conductive pattern and the second transparent conductive pattern are electrically connected to each other by an adhesive portion including an electrically conductive adhesive material at an extended portion of the solar cell.

9. The method of claim 8,
And a rear protective layer disposed between the front surface of the solar cells and the light transmissive front substrate and between the rear surface of the solar cells and the rear transparent substrate.