JP2018198285A - Solar battery module and solar battery module manufacturing method - Google Patents

Abstract

To inhibit an electrode at a back side of a solar battery cell from being peeled off when peeling off an adhesion tape.SOLUTION: In a solar battery module 1, a plurality of solar battery cells 20 are arranged in matrix at intervals in an X-axis direction and in a Y-axis direction orthogonal to the X-axis direction, respectively. A plurality of wiring members 70 are arranged between the plurality of solar battery cells 20 arranged in the X-axis direction, respectively, to electrically connect the plurality of solar battery cells 20. The plurality of solar battery cells 20 arranged in the X-axis direction are connected by the plurality of wiring members 70 to be integrated to the members, and the plurality of solar battery cells 20 and the plurality of wiring members 70 integrated with one another are arranged in plural numbers at intervals from one another in the Y-axis direction. Further, the solar battery module 1 comprises adhesion tapes 90 arranged between the plurality of wiring members 70 adjacent to one another in the Y-axis direction. The plurality of wiring members 70 adjacent to one another in the Y-axis direction are connected to one another by the adhesion tapes 90.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a solar cell module including a plurality of solar cells and a method for manufacturing the solar cell module.

  The solar cell module includes a plurality of solar cells. Sealing members are provided on the front and back sides of the plurality of solar cells. This type of solar cell module is formed, for example, by placing a filling member on the front surface side and the back surface side of a plurality of solar cells, and then subjecting the plurality of solar cells and the filling member to heat and pressure treatment. . In the solar cell module disclosed in Patent Document 1, in order to suppress the distortion or the like of the solar cell generated at the time of the heat and pressure treatment, the two adjacent solar cells are fixed with a fixing tape and then heated and pressurized. Processing is performed.

International Publication No. 2016/103625

  In the above solar cell module, as shown in FIG. 4 of Patent Document 1, a fixing tape is attached to the vicinity of the center of each of two opposing sides of two substantially rectangular solar cells, and the two solar cells. The battery cell is fixed.

  For example, in a back junction solar cell module, an electrode for collecting current is provided on the back surface side opposite to the light receiving surface side. However, as shown in Patent Document 1, each of two opposing sides of the solar battery cell is provided. When the fixing tape is affixed in the vicinity of the center, the fixing tape is also affixed to the back side electrode. For this reason, when an operation of peeling the fixing tape from the solar battery cell due to an error in attaching the fixing tape or an equipment error occurs, there is a problem that the electrode on the back surface side of the solar battery cell is also peeled off together. When the electrode on the back surface side of the solar battery cell is peeled off, there arises a problem that the output of the solar battery cell is lowered and the characteristics of the solar battery module are deteriorated.

  An object of this invention is to provide the solar cell module etc. which suppress peeling of the electrode of the back surface side of a photovoltaic cell.

  In order to achieve the above object, one aspect of a solar cell module according to the present invention includes a plurality of solar cells and a plurality of wiring members that electrically connect the plurality of solar cells. The plurality of solar cells are arranged in a matrix, spaced in the first direction and the second direction orthogonal to the first direction, and each of the solar cells. Are a substrate made of a semiconductor material, an n-type semiconductor layer formed on the back surface side of the substrate that is the same side as the back surface side of the solar battery cell, and the n-type semiconductor layer on the surface. A p-type semiconductor layer formed in a region where is not formed, an n-side electrode formed on the n-type semiconductor layer, and a p-side electrode formed on the p-type semiconductor layer, Each of the plurality of wiring members includes the first wiring member. The n-side electrode of a predetermined solar cell among the plurality of solar cells disposed in the first direction and between the plurality of solar cells disposed in the direction, and the predetermined sun The plurality of solar cells connected to the p-side electrode of the solar cell located next to the battery cell and arranged in the first direction are integrated by being connected by the plurality of wiring members. The plurality of integrated solar cells and the plurality of wiring members are arranged with a space therebetween in the second direction, and the solar cell module is further adjacent in the second direction. An adhesive tape disposed between the plurality of matching wiring members is provided, and the plurality of wiring members adjacent in the second direction are connected by the adhesive tape.

  Moreover, the one aspect | mode of the manufacturing method of the solar cell module which concerns on this invention is spaced apart in each direction of the 1st direction and the 2nd direction orthogonal to the said 1st direction. And a plurality of wiring members that electrically connect the plurality of solar cells, and the plurality of solar cells adjacent to each other in the first direction. Are connected by the wiring member to be integrated, and a plurality of the plurality of integrated photovoltaic cells and the wiring member are arranged in the second direction with a space therebetween, and the second direction. A connecting step of disposing an adhesive tape between the plurality of wiring members adjacent to each other and connecting the plurality of wiring members adjacent in the second direction with the adhesive tape.

  According to the solar cell module according to the present invention, peeling of the electrode on the back surface side of the solar cell can be suppressed.

It is the top view which looked at the solar cell module which concerns on embodiment from the back surface side. It is sectional drawing of the solar cell module in the II-II line | wire of FIG. It is the top view which looked at the photovoltaic cell which concerns on embodiment from the back surface side. It is sectional drawing of the photovoltaic cell in the IV-IV line | wire of FIG. It is an example of the arrangement | positioning drawing of the photovoltaic cell, wiring member, and adhesive tape which are contained in the solar cell module which concerns on embodiment. 6A is an enlarged plan view of a VIa portion of the solar cell module shown in FIG. 5, and FIG. 6B is a cross-sectional view taken along the line VIb-VIb in FIG. It is a flowchart which shows the manufacturing method of the solar cell module which concerns on embodiment. It is a figure which shows the manufacturing method of the solar cell module which concerns on embodiment in order. It is an enlarged plan view of the solar cell module which concerns on the modification 1 of embodiment. FIG. 10A is an enlarged plan view of a solar cell module according to Modification 2 of the embodiment, and FIG. 10B is a cross-sectional view taken along line Xb-Xb in FIG. FIG. 11A is an enlarged plan view of a solar cell module according to Modification 3 of the embodiment, and FIG. 11B is a cross-sectional view taken along line XIb-XIb in FIG.

  Below, the solar cell module and solar cell which concern on embodiment of this invention are demonstrated in detail using drawing. Each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement of components, connection modes, processes, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily shown strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the same structural member.

  In this specification, the “front surface” of a solar battery cell means a surface that allows more light to enter the interior than the “rear surface” that is the opposite surface (over 50% to 100% light is the surface). And the case where no light enters the interior from the “back surface” side. Further, the “front surface” of the solar cell module means a surface on which light on the “front surface” side of the solar battery cell can be incident, and the “back surface” of the solar cell module means a surface on the opposite side. In addition, descriptions such as “providing the second member on the first member” do not intend only when the first and second members are provided in direct contact unless specifically limited. That is, this description includes the case where another member exists between the first and second members. In addition, the description of “substantially **” is intended to include not only exactly the same, but also those that are recognized as being substantially the same, with “substantially identical” as an example.

(Embodiment)
[1. Configuration of solar cell module]
First, a schematic configuration of the solar cell module 1 according to the embodiment will be described with reference to FIGS. 1 and 2.

  Drawing 1 is a top view which looked at solar cell module 1 concerning an embodiment from the back side. 2 is a cross-sectional view of the solar cell module 1 taken along line II-II in FIG. FIG. 5 is an example of a layout diagram of the solar battery cell 20, the wiring member 70, and the adhesive tape 90 included in the solar battery module 1 according to the embodiment. In FIG. 5, the filling member and the like are not shown.

  As shown in FIGS. 1 and 5, the solar cell module 1 includes solar cell strings 10a, 10b, 10c, 10d, 10e, and 10f. Each of the solar cell strings 10a to 10f has, for example, 12 solar cells 20 as shown in FIG.

  As shown in FIG. 2, the solar cell strings 10 a to 10 f are arranged between the front surface side protection member 11 and the back surface side protection member 12. The protection member 11 is positioned on the light receiving surface 20a side (surface side: Z-axis positive direction side) of the solar battery cell 20. The protection member 12 is located on the back surface 20b side (back surface side: Z-axis negative direction side) of the solar battery cell 20. The protection member 12 has flexibility. Between the protection member 11 and the solar battery cell 20. Is provided with a front-side filling member 13. A back-side filling member 14 is provided between the protective member 12 and the solar battery cell 20. The filling member 13 and the filling member 14 provide a plurality of filling members 14. The solar battery cell 20 is sealed.

  The protection member 11 is formed of a light-transmitting member such as a glass substrate or a resin substrate.

  The protection member 12 is formed of a flexible member such as a resin sheet or a resin sheet with a metal foil interposed therebetween.

  The filling member 13 and the filling member 14 are formed of, for example, a resin such as ethylene / vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), polyethylene (PE), or polyurethane (PU).

  Each of the solar cell strings 10a to 10f is arranged along the X-axis direction (first direction) orthogonal to the Y-axis direction (second direction) that is the arrangement direction of the solar cell strings 10a to 10f. It has a plurality of solar cells 20.

  FIG. 3 is a plan view of the solar battery cell 20 according to the embodiment as viewed from the back surface side. The solar battery cell 20 has a polygonal shape when viewed from the back side of the solar battery cell 20. The solar battery cell 20 has four corners C1, and each corner C1 has a chamfered shape.

  As shown in FIG. 3, the solar battery cell 20 includes a photoelectric conversion unit 29, an n-side electrode 23, and a p-side electrode 24.

  The photoelectric conversion unit 29 is mainly formed of an n-type semiconductor substrate having a first main surface and a second main surface. The semiconductor substrate is formed of, for example, a crystalline semiconductor such as crystalline silicon. The first main surface of the photoelectric conversion unit 29 corresponds to the back surface 20 b of the solar battery cell 20, and the second main surface of the photoelectric conversion unit 29 corresponds to the light receiving surface 20 a of the solar battery cell 20.

  The photoelectric conversion unit 29 is a member that generates carriers such as holes and electrons when receiving light. The photoelectric conversion unit 29 generates a carrier when receiving light on the light receiving surface 20a.

  On the back surface 20b of the photoelectric conversion unit 29, an n-side electrode 23 that collects carriers (electrons) and a p-side electrode 24 that collects carriers (holes) are formed. With this configuration, the solar battery cell 20 according to the present embodiment is a back junction solar battery.

  The n-side electrode 23 has a plurality of finger electrodes 23a and a bus bar electrode 23b that form a comb shape when the back surface 20b is viewed in plan. The p-side electrode 24 has a plurality of finger electrodes 24a and a bus bar electrode 24b that form a comb shape when the back surface 20b is viewed in plan. Further, the n-side electrode 23 and the p-side electrode 24 are disposed so as to be interleaved with each other. The plurality of finger electrodes 23a and 24a are a plurality of electrode linear portions extending along the X-axis direction, and are arranged at intervals from each other along the Y-axis direction.

  The plurality of finger electrodes 23a are electrically connected to the bus bar electrode 23b. The bus bar electrode 23b is connected to one end of the plurality of finger electrodes 23a in the X-axis direction. Similarly, the plurality of finger electrodes 24a are electrically connected to the bus bar electrode 24b. The bus bar electrode 24b is connected to the other end of the plurality of finger electrodes 24a in the X-axis direction.

  As shown in FIGS. 1 and 5, in each of the solar cell strings 10 a to 10 f, the solar cells 20 adjacent in the X-axis direction are electrically connected by a wiring member 70. Specifically, among the solar cells 20 adjacent in the X-axis direction, the n-side electrode 23 of a predetermined solar cell 20 (for example, the solar cell 20A in FIG. 5) and the predetermined solar cell 20 are adjacent to each other. The p-side electrode 24 of the solar battery cell 20 (for example, the solar battery cell 20B in FIG. 5) located at is electrically connected by the wiring member 70. The wiring member 70 is disposed in a part of the gap region between the adjacent solar cells 20.

  The wiring member 70 is formed of a base material layer made of resin and a conductive layer made of metal (not shown). The conductive layer is, for example, a metal foil, a laminate of metal foils, a metal foil whose surface is covered with solder or the like. The metal foil and the wiring are made of, for example, Ag, Cu or the like. The base material layer is, for example, a flexible insulating film such as polyimide. The wiring member 70 is, for example, a flexible printed circuit (FPC) composed of a base material layer and a conductive layer formed of these materials. The wiring member 70 and the back surface 20b of the solar battery cell 20 are bonded by an adhesive layer. Examples of the material for the adhesive layer include a cured product of a resin adhesive, a cured product of a conductive resin adhesive in which a conductive material is dispersed and mixed, and solder.

  As shown in FIG. 5, solar cell strings 10 a to 10 f adjacent in the Y-axis direction are fixed by ten adhesive tapes 90. For example, as shown in the VIa portion of FIG. 5, the wiring member 70 a included in the solar cell string 10 d and the wiring member 70 b included in the solar cell string 10 f are connected by one adhesive tape 90. Thus, by connecting the wiring members 70 adjacent in the Y-axis direction with the adhesive tape 90, the positional relationship between the solar cell strings 10a to 10d is fixed in a constant state. Note that it is not necessary for all the wiring members 70 adjacent in the Y-axis direction to be connected by the adhesive tape 90, and several wiring members 70 adjacent in the Y-axis direction are connected by the adhesive tape 90. That's fine. The wiring member 70 and the adhesive tape 90 will be described later in “3. Configuration of Solar Cell Connection Portion”.

  The solar cell strings 10 a to 10 f are electrically connected by the wiring member 32. Specifically, the n-side electrode 23 of the solar battery cell 20 positioned closest to the X-axis negative direction side of the solar battery string 10a and the solar battery cell positioned closest to the X-axis negative direction of the solar battery string 10b. The 20 p-side electrodes 24 are electrically connected by the wiring member 32. The same applies to the connection between the solar cell string 10c and the solar cell string 10d and the connection between the solar cell string 10e and the solar cell string 10f.

  Further, the n-side electrode 23 of the solar battery cell 20 located closest to the X-axis positive direction side of the solar battery string 10b and the p of the solar battery cell 20 located closest to the X-axis positive direction side of the solar battery string 10c. The side electrode 24 is electrically connected by the wiring member 32. The same applies to the connection between the solar cell string 10d and the solar cell string 10e.

  A part of the wiring member 32 located on the X axis positive direction side constitutes an extraction electrode 41. As shown in FIG. 2, the leading end portion of the extraction electrode 41 is extracted outside the protective member 12 on the back surface side.

  The wiring member 32 includes two wiring members 32a and a wiring member 32b. Each of the two wiring members 32 a is bonded to the solar battery cell 20 with an adhesive layer, and is electrically connected to the n-side electrode 23 or the p-side electrode 24. The wiring member 32b electrically connects the two wiring members 32a.

  The wiring member 32a is composed of a flexible printed board having a resin film and wiring. The resin film is formed of, for example, a resin such as polyimide (PI) or polyethylene terephthalate (PET). The wiring is electrically connected to the n-side electrode 23 or the p-side electrode 24, and is formed of, for example, a metal foil made of at least one kind of metal such as Cu and Ag. The wiring member 32b is also formed of a metal foil made of at least one kind of metal such as Cu and Ag.

  The p-side electrode 24 of the solar battery cell 20 positioned closest to the X-axis positive direction side of the solar battery string 10a, and the n of the solar battery cell 20 positioned closest to the X-axis positive direction side of the solar battery string 10f. The side electrode 23 is connected to the wiring material 33.

  The wiring member 33 includes a wiring member 32a and a wiring member 33b. The wiring member 32 a constituting a part of the wiring member 33 has substantially the same configuration as the wiring member 32 a constituting a part of the wiring member 32. The wiring member 33 b is electrically connected to a wiring member 32 a that constitutes a part of the wiring member 33. A part of the wiring member 33 b constitutes the extraction electrode 42. As shown in FIG. 2, the leading end portion of the extraction electrode 42 is extracted to the outside of the protective member 12 on the back surface side. The wiring member 33b is formed of a metal foil made of at least one kind of metal such as Cu and Ag.

  An insulating sheet 60 is disposed between the wiring members 32 b and 33 b and the lead electrodes 41 and 42 formed of metal foil and the back surface 20 b of the solar battery cell 20. Thereby, it is possible to suppress a short circuit between the wiring members 32 b and 33 b and the lead electrodes 41 and 42 and the n-side electrode 23 and the p-side electrode 24. The material of the insulating sheet 60 is, for example, a resin such as EVA, PVB, PE, PU used as the filling member 13 and the filling member 14 in addition to a resin such as PI and PET used as a resin film. .

  Next, the structure for the solar cell 20 which concerns on this Embodiment to have the function to collect the carrier produced | generated by the light which injected on the light-receiving surface 20a on the back surface 20b is demonstrated in detail.

[2. Solar cell configuration]
FIG. 4 is a cross-sectional view of the solar battery cell 20 according to the embodiment. Specifically, FIG. 4 is a cross-sectional view of the solar battery cell 20 taken along line IV-IV in FIG.

  The solar battery cell 20 has an n-type (one conductivity type) semiconductor substrate 26. Specifically, the semiconductor substrate 26 is a wafer-like substrate made of, for example, n-type crystalline silicon. Note that crystalline silicon includes single crystal silicon or polycrystalline silicon. The semiconductor substrate 26 may be p-type (other conductivity type). The material of the semiconductor substrate 26 may be a compound semiconductor such as GaAs or InP. In addition, it is preferable that the thickness of the semiconductor substrate 26 is 50 micrometers-300 micrometers.

  As described above, the semiconductor substrate 26 has the first main surface and the second main surface, and the n-type semiconductor layer 21 and the p-type semiconductor layer 22 are formed on the first main surface. .

  The n-type semiconductor layer 21 is, for example, a stacked body in which an n-type amorphous semiconductor layer 21n having the same conductivity type as the semiconductor substrate 26 and a passivation layer 21i are stacked. The n-type amorphous semiconductor layer 21n is an amorphous semiconductor layer containing an n-type dopant. The n-type amorphous semiconductor layer 21n is formed of amorphous silicon containing an n-type dopant, for example. The thickness of the n-type amorphous semiconductor layer 21n is preferably 1 nm to 40 nm. The n-type amorphous semiconductor layer 21n has a minority carrier diffused toward the n-type amorphous semiconductor layer 21n among the carriers generated in the semiconductor substrate 26 by light reception between the n-type amorphous semiconductor layer 21n and the semiconductor substrate 26. An electric field for pushing back is formed.

  The passivation layer 21i is disposed between the n-type amorphous semiconductor layer 21n and the first main surface. The passivation layer 21i is made of, for example, intrinsic amorphous silicon. The thickness of the passivation layer 21 i is not particularly limited as long as it does not substantially contribute to power generation and the recombination centers of carriers on the surface of the semiconductor substrate 26 can be reduced. The thickness of the passivation layer 21i is, for example, about several to 250 inches.

  The p-type semiconductor layer 22 is, for example, a stacked body in which a p-type amorphous semiconductor layer 22p having a conductivity type different from that of the semiconductor substrate 26 and a passivation layer 22i are stacked. The p-type amorphous semiconductor layer 22p is an amorphous semiconductor layer containing a p-type dopant. The p-type amorphous semiconductor layer 22p is formed of amorphous silicon containing a p-type dopant, for example. The thickness of the p-type amorphous semiconductor layer 22p is preferably 2 nm to 50 nm. The p-type amorphous semiconductor layer 22p forms an electric field for separating carriers generated in the semiconductor substrate 26 by light reception with the semiconductor substrate 26.

  The passivation layer 22i is disposed between the p-type amorphous semiconductor layer 22p and the first main surface. The passivation layer 22i is formed of, for example, intrinsic amorphous silicon. The thickness of the passivation layer 22i is not particularly limited as long as it does not substantially contribute to power generation and the recombination center of carriers on the surface of the semiconductor substrate 26 can be reduced. The thickness of the passivation layer 22i is, for example, about several to 250 inches.

  Note that at least one of the n-type semiconductor layer 21 and the p-type semiconductor layer 22 preferably contains hydrogen. By including hydrogen in the semiconductor layer, the effect of suppressing recombination of carriers by the semiconductor layer can be enhanced.

Here, intrinsic amorphous silicon refers to amorphous silicon having a dopant content of less than 1 × 10 ¹⁹ cm ⁻³ . The n-type semiconductor layer refers to a semiconductor layer having an n-type dopant content of 5 × 10 ¹⁹ cm ⁻³ or more. The p-type semiconductor layer refers to a semiconductor layer having a p-type dopant content of 5 × 10 ¹⁹ cm ⁻³ or more. In addition, the amorphous semiconductor layer may include microcrystals.

The passivation layers 21i and 22i may be thin films that can reduce the recombination center of carriers on the surface of the semiconductor substrate 26. Even if silicon oxide such as SiO ₂ , silicon nitride such as SiN, or silicon oxynitride such as SiON is used. Good.

  The n-type semiconductor layer 21 and the p-type semiconductor layer 22 have a plurality of linear portions extending along the X-axis direction, like the plurality of finger electrodes 23a and 24a formed thereabove. The finger electrodes 23a and 24a adjacent in the Y-axis direction are connected to the n-type semiconductor layer 21 and the p-type semiconductor layer 22, respectively. The n-type semiconductor layer 21 and the p-type semiconductor layer 22 have the first main surface. Substantially covering.

  A finger electrode 23 a is formed on the n-type semiconductor layer 21 and joined to the n-type semiconductor layer 21. On the other hand, a finger electrode 24 a is formed on the p-type semiconductor layer 22 and joined to the p-type semiconductor layer 22. A p-type semiconductor layer 22 is interposed between the finger electrodes 23a and 24a.

  The widths of the finger electrodes 23a and 24a are, for example, 50 μm to 2000 μm, respectively.

  As shown in FIG. 3, the finger electrode 23a is connected to the bus bar electrode 23b, and the n-side electrode 23 is formed in a comb shape. The finger electrode 24a is connected to the bus bar electrode 24b, and the p-side electrode 24 is formed in a comb shape.

  The n-side electrode 23 and the p-side electrode 24 are formed of, for example, a metal such as Cu or Ag and an alloy containing one or more of these metals. Further, the n-side electrode 23 and the p-side electrode 24 may be formed of, for example, TCO (Transparent Conductive Oxide) such as ITO (Indium Tin Oxide). Further, the n-side electrode 23 and the p-side electrode 24 may be formed of a stacked body of a plurality of conductive layers made of the metal, alloy, or TCO, and are in contact with the n-type semiconductor layer 21 or the p-type semiconductor layer 22. A TCO may be provided, and a metal or an alloy may be provided thereon.

  An insulating layer 25 is formed under both end portions of the finger electrodes 23a and 24a except for the central portion in the Y-axis direction. On the other hand, the central portions of the finger electrodes 23 a and 24 a in the Y-axis direction are exposed from the insulating layer 25. The insulating layer 25 insulates the end of the n-type semiconductor layer 21 in the Y-axis direction and the end of the p-type semiconductor layer 22 in the Y-axis direction at the end of the finger electrode 23a in the Z-axis direction.

The material of the insulating layer 25 is not particularly limited. The insulating layer 25 is made of, for example, silicon oxide such as SiO ₂ , silicon nitride such as SiN, or silicon oxynitride such as SiON. The insulating layer 25 may be formed of a metal oxide such as titanium oxide or tantalum oxide. In particular, the insulating layer 25 is preferably made of silicon nitride. The insulating layer 25 preferably contains hydrogen.

  Thereby, the solar battery cell 20 collects the carriers (electrons) generated in the semiconductor substrate 26 by the light incident from the light receiving surface 20 a on the finger electrode 23 a via the n-type semiconductor layer 21. On the other hand, carriers (holes) generated in the semiconductor substrate 26 by the light incident from the light receiving surface 20 a are collected on the finger electrode 24 a through the p-type semiconductor layer 22. That is, in the back junction solar cell 20, it is not necessary to provide an electrode on the light receiving surface 20 a side, so that the light receiving area is not impaired and the photoelectric conversion efficiency can be increased.

  Further, since the n-type semiconductor layer 21 and the p-type semiconductor layer 22 have the passivation layers 21 i and 22 i between the semiconductor substrate 26 and the semiconductor substrate 26, disappearance due to carrier recombination is further effectively suppressed. can do. Therefore, further improved photoelectric conversion efficiency can be obtained.

  An n-type semiconductor layer 27n having the same conductivity type as that of the semiconductor substrate 26 is formed on the second main surface side of the semiconductor substrate 26. The n-type semiconductor layer 27n is a semiconductor layer containing an n-type dopant. The n-type semiconductor layer 27n is formed of amorphous silicon containing an n-type dopant, for example. Note that the thickness of the n-type semiconductor layer 27n is preferably 1 nm to 40 nm.

A passivation layer 27i is disposed between the second main surface and the n-type semiconductor layer 27n. The passivation layer 27i is formed of i-type amorphous silicon, for example. The thickness of the passivation layer 27i is not particularly limited as long as the thickness does not substantially contribute to power generation. The thickness of the passivation layer 27i is, for example, about several to 250 inches. Also, the passivation layer 27i on behalf of the i-type amorphous silicon, silicon oxide such as SiO _2, silicon nitride such as SiN, may be formed of a silicon oxynitride such as SiON.

On the n-type semiconductor layer 27n, an insulating film 28 having both a function as an antireflection film and a function as a protective film is formed. The insulating film 28 is made of, for example, silicon oxide such as SiO ₂ , silicon nitride such as SiN, or silicon oxynitride such as SiON. The thickness of the insulating film 28 is appropriately set according to the antireflection characteristics of the antireflection film to be applied. The thickness of the insulating film 28 is, for example, about 80 nm to 1 μm.

  In addition, no light shielding material such as a metal layer is provided on the light receiving surface 20a. As a result, light can be received by the entire light receiving surface 20a.

[3. Configuration of connecting portion between solar cells]
Next, the characteristic structure in the connection part between photovoltaic cells of the solar cell module 1 which concerns on this Embodiment is demonstrated.

  6A is an enlarged plan view of a VIa portion of the solar cell module 1 shown in FIG. 5, and FIG. 6B is a cross-sectional view taken along line VIb-VIb in FIG.

  6A shows four solar cells 20A, 20B, 20C, and 20D among the plurality of solar cells 20, and two wiring members among the plurality of wiring members 70 as a representative example. 70a and 70b are shown, and one adhesive tape 90a of the plurality of adhesive tapes 90 is shown.

  Solar cells 20A and 20B are arranged adjacent to each other along the X-axis direction (first direction). One wiring member 70a of the two wiring members 70a and 70b is disposed in the gap region between the solar cells 20A and 20B. Solar cells 20A and 20B are connected and integrated by wiring member 70a.

  Solar cells 20C and 20D are arranged adjacent to each other along the X-axis direction. Of the two wiring members 70a and 70b, the other wiring member 70b is provided in the gap region between the solar cells 20C and 20D. Solar cells 20C and 20D are connected and integrated by wiring member 70b.

  Each of the wiring members 70a and 70b has a rectangular shape when the solar cell module 1 is viewed from the back side. The width of the wiring member 70a is larger than the interval between the solar cells 20A and 20B, and the dimension in the longitudinal direction (Y-axis direction) of the wiring member 70a is larger than the length of the opposing sides of the solar cells 20A and 20B. small. The width of the wiring member 70b is larger than the interval between the solar cells 20C and 20D, and the longitudinal dimension of the wiring member 70b is smaller than the length of the opposing sides of the solar cells 20C and 20D.

  The integrated solar cells 20A and 20B and the wiring member 70a, and the integrated solar cells 20C and 20D and the wiring member 70b are arranged with a space therebetween in the Y-axis direction (second direction). ing.

  The adhesive tape 90a is disposed between the wiring members 70a and 70b adjacent in the Y-axis direction, and connects the wiring members 70a and 70b. Specifically, the adhesive tape 90a is disposed on the axis in the Y-axis direction where the wiring members 70a and 70b are disposed. Thereby, the wiring members 70a and 70b are connected by the adhesive tape 90a.

  The adhesive tape 90a has a rectangular shape when viewed from the back side. The width of the adhesive tape 90a is smaller than the width of the wiring members 70a and 70b. The adhesive tape 90a has both ends in the longitudinal direction (Y-axis direction) orthogonal to the width direction (X-axis direction) of the adhesive tape 90a, and one end of both ends is bonded to the wiring member 70a. The other end is bonded to the wiring member 70b. In the X-axis direction, it is desirable that the adhesive tape 90a is disposed inside the outer edges of the wiring members 70a and 70b so as not to protrude from the outer edges of the wiring members 70a and 70b.

  The adhesive tape 90a has a base material layer 91 formed of a resin material and an adhesive layer 92 provided on one surface of the base material layer 91 (see FIG. 6B). The base material layer 91 is formed of, for example, a material such as polyimide, and has insulating properties, heat resistance, and flexibility. The adhesive layer 92 is formed of, for example, a cured product of a resin adhesive and has insulating properties and heat resistance. The adhesive tape 90a is bonded to the base material layers of the wiring members 70a and 70b through the adhesive layer 92.

  Further, when the solar battery module 1 is viewed from the back side, the adhesive tape 90a does not overlap the finger electrodes 23a and 24a that are electrodes formed on the back side of the solar cells 20A to 20D, and the wiring member 70a. And a part of 70b. Since the adhesive tape 90a is disposed so as not to overlap the finger electrodes 23a and 24a, it is possible to suppress the finger electrodes 23a and 24a from being damaged when the adhesive tape 90a is peeled off from the wiring members 70a and 70b. .

  In addition, the width | variety of the adhesive tape 90a is larger than the space | interval of the photovoltaic cell 20A and 20B adjacent to the X-axis direction. Therefore, in this embodiment, when viewed from the back side, a part of the adhesive tape 90 overlaps each of the bus bar electrodes 23b and 24b. However, in the present embodiment, for example, the contact area between the adhesive tape 90a and the electrode on the back surface side as compared with the conventional technique in which the adhesive tape is attached to the vicinity of the center of each of two opposing sides of the solar battery cell. Therefore, even when the adhesive tape 90a is peeled off, the electrode peeling can be reduced.

  The solar cell module 1 of the present embodiment includes a plurality of solar cells 20 and a plurality of wiring members 70 that electrically connect the plurality of solar cells 20. The plurality of solar cells 20 are arranged in a matrix with intervals in the X-axis direction (first direction) and the Y-axis direction (second direction) orthogonal to the X-axis direction. Each of the solar cells 20 includes a substrate 26 made of a semiconductor material, an n-type semiconductor layer 21 formed on the surface on the back surface side of the substrate 26 that is the same side as the back surface side of the solar cell 20, and the above surface. A p-type semiconductor layer 22 formed in a region where the n-type semiconductor layer 21 is not formed, an n-side electrode 23 formed on the n-type semiconductor layer 21, and a p-type semiconductor layer 22. And a p-side electrode 24 formed. Each of the plurality of wiring members 70 is disposed between the plurality of solar cells 20 disposed in the X-axis direction, and is a predetermined solar cell (for example, among the plurality of solar cells 20 disposed in the X-axis direction). The n-side electrode 23 of the solar battery cell 20A) is connected to the p-side electrode 24 of the solar battery cell (for example, the solar battery cell 20C) located next to the predetermined solar battery cell. The plurality of solar cells 20 arranged in the X-axis direction are integrated by being connected by a plurality of wiring members 70, and the plurality of integrated solar cells 20 and the plurality of wiring members 70 are integrated with the Y-axis. A plurality are arranged in the direction spaced apart from each other. Furthermore, the solar cell module 1 includes an adhesive tape 90 disposed between a plurality of wiring members 70 adjacent in the Y-axis direction. A plurality of wiring members 70 adjacent in the Y-axis direction are connected by an adhesive tape 90.

  According to the above configuration, the position of the solar battery cell 20 is substantially determined by connecting the wiring members 70 adjacent to each other in the Y-axis direction by the adhesive tape 90. The contact area between the adhesive tape 90 and the solar battery cell 20 can be reduced. Therefore, the contact area between the adhesive tape 90 and the electrode on the back surface side of the solar battery cell 20 can be reduced. Thereby, when peeling adhesive tape 90 from the photovoltaic cell 20, for example, it can suppress that the electrode of the back surface side of the photovoltaic cell 20 peels.

  Each of the n-side electrode 23 and the p-side electrode 24 has a comb-tooth shape, and a plurality of finger electrodes 23a, 24a extending along the X-axis direction, and a bus bar connected to the plurality of finger electrodes 23a, 24a It has electrodes 23b and 24b. When the solar cell module 1 is viewed from the back side, the adhesive tape 90 does not overlap the finger electrodes 23 a and 24 a but overlaps a part of the wiring member 70.

  According to the said structure, it can prevent that the adhesive tape 90 contacts the finger electrodes 23a and 24a of the back surface side of the photovoltaic cell 20. FIG. Thereby, for example, when the adhesive tape 90 is peeled from the solar battery cell 20, it is possible to prevent the finger electrodes 23 a and 24 a on the back surface side of the solar battery cell 20 from being peeled off.

[4. Manufacturing method of solar cell module]
Next, the manufacturing method of the solar cell module 1 in this Embodiment is demonstrated. FIG. 7 is a flowchart showing a method for manufacturing the solar cell module 1. FIG. 8 is a diagram illustrating a method for manufacturing the solar cell module 1 in order. Here, the solar cells 20A to 20D among the plurality of solar cells 20 will be described as representative examples (see FIG. 8).

  First, among the plurality of solar cells 20 arranged in the X-axis direction, the wiring member extends across a predetermined solar cell 20A and a solar cell 20B located next to the predetermined solar cell 20A. 70a is arranged (not shown). Thereafter, the wiring member 70a is thermocompression bonded to the solar cells 20A and 20B. Thereby, the photovoltaic cells 20A and 20B are connected and integrated by the wiring member 70a. Similarly, the solar cells 20C and 20D are connected and integrated by the wiring member 70b. Then, as shown in FIG. 8A, the integrated solar cells 20A and 20B and the wiring member 70a, and the solar cells 20C and 20D and the wiring member 70b are adjacent to each other in the Y-axis direction. Arrange (S11: Arrangement step).

  Next, the integrated solar cells 20A and 20B and the wiring member 70a, and the integrated solar cells 20C and 20D and the wiring member 70b are fixed with an adhesive tape 90. Specifically, as shown in FIG. 8B, two wiring members 70a and 70b adjacent in the Y-axis direction are connected by an adhesive tape 90a. Thereby, it fixes so that the positional relationship of photovoltaic cell 20A-20D may become a fixed state (S12: connection process).

  Next, as shown in FIG. 8C, the front surface side protection member 11, the front surface side filling member 13, the solar cells 20A to 20D, the wiring members 70a and 70b, the adhesive tape 90, and the back surface side filling member. 14 and the protection member 12 on the back side are stacked in this order (S13: stacking step).

  Next, as shown in FIG. 8D, the laminated body obtained in the stacking process is subjected to heat and pressure treatment (S14: laminating process). In that case, the said laminated body is thermocompression-bonded (heating and pressurization) in the vacuum at the temperature of 100 degreeC or more, for example. By this thermocompression bonding, the filling members 13 and 14 are heated and melted and crosslinked and cured, and the solar cells 20A to 20D, the wiring members 70a and 70b, and the adhesive tape 90a are sealed by the filling members 13 and 14. The solar cell module 1 is manufactured by these steps S11 to S14.

  The manufacturing method of the solar cell module 1 according to the present embodiment has a matrix shape with an interval in each of the X-axis direction (first direction) and the Y-axis direction (second direction) orthogonal to the X-axis direction. And a plurality of wiring members 70 that electrically connect the plurality of solar cells 20, and are adjacent to each other in the X-axis direction. A plurality of solar cells 20 are connected and integrated by the wiring member 70, and a plurality of the plurality of integrated solar cells 20 and wiring members 70 are arranged in the Y-axis direction with a space therebetween, A connecting step S12 in which an adhesive tape 90 is disposed between the plurality of wiring members 70 adjacent in the Y-axis direction, and the plurality of wiring members 70 adjacent in the Y-axis direction are connected by the adhesive tape 90.

  By connecting and fixing the plurality of wiring members 70 with the adhesive tape 90 as in the above configuration, the position of the solar battery cell 20 can be substantially determined, and adhesion when fixing the position of the solar battery cell 20 The contact area between the tape 90 and the solar battery cell 20 can be reduced. Therefore, the contact area between the adhesive tape 90 and the electrode of the solar battery cell 20 can be reduced. Thereby, when peeling adhesive tape 90 from the photovoltaic cell 20 before stacking process S13, for example, it can suppress that an electrode is stripped from the photovoltaic cell 20. FIG. In addition, since the plurality of solar cells 20 and the plurality of wiring members 70 are integrated, for example, when the plurality of solar cells 20 and the plurality of wiring members 70 are handled and moved, each solar cell 20 It is possible to move while maintaining the positional relationship.

  Moreover, the manufacturing method of the solar cell module 1 may include the process of crimping | bonding the filling members 13 and 14 to the surface side and back surface side of the photovoltaic cell 20 after connection process S12.

  According to this, the distortion | strain of the each photovoltaic cell 20 which generate | occur | produces at the time of the heating and pressurizing process of the several photovoltaic cell 20 and the filling members 13 and 14 or the positional relationship shift can be suppressed. Thereby, it can suppress that the characteristic of the solar cell module 1 deteriorates.

[5. Configuration of Solar Cell Module According to Modification 1]
FIG. 9 is an enlarged plan view of a solar cell module 1A according to Modification 1 of the embodiment. In the solar cell module 1 </ b> A according to the first modification, the width of the adhesive tape 90 is narrower than that of the solar cell module 1.

  Specifically, as shown in FIG. 9, the width of the adhesive tape 90a of Modification 1 is smaller than the interval between the solar cells 20A and 20B adjacent in the X-axis direction. In the first modification, when viewed from the back side, the adhesive tape 90a does not overlap the bus bar electrodes 23b and 24b.

  With the above configuration, in the solar cell module 1 </ b> A of the first modification, the adhesive tape 90 can be prevented from contacting the finger electrodes 23 a and 24 a on the back surface side of the solar cell 20. Thereby, for example, when the adhesive tape 90 is peeled from the solar battery cell 20, it is possible to prevent the finger electrodes 23 a and 24 a on the back surface side of the solar battery cell 20 from being peeled off.

[6. Configuration of Solar Cell Module According to Modification 2]
FIG. 10A is an enlarged plan view of a solar cell module 1B according to Modification 2 of the embodiment, and FIG. 10B is a cross-sectional view taken along line Xb-Xb in FIG. In the solar cell module 1 </ b> B according to Modification Example 2, the region of the adhesive layer 92 formed on the adhesive tape 90 is narrower than that of the solar cell module 1.

  As shown in FIG. 10 (b), in the solar cell module 1B of Modification 2, the adhesive layer 92 of the adhesive tape 90a is formed in a region in contact with the wiring members 70a and 70b. Specifically, the adhesive tape 90a has both ends in the longitudinal direction of the adhesive tape 90a, and an adhesive layer 92 is formed on each of the both ends. One of the adhesive layers formed at both ends is adhered to the wiring member 70a, and the other adhesive layer is adhered to the wiring member 70b.

  Also in the modification 2, since the wiring members 70 adjacent in the Y-axis direction are connected by the adhesive tape 90, the contact area between the adhesive tape 90 and the solar battery cell 20 can be reduced. Therefore, the contact area between the adhesive tape 90 and the electrode on the back surface side of the solar battery cell 20 can be reduced. Thereby, when peeling adhesive tape 90 from the photovoltaic cell 20, for example, it can suppress that the electrode of the back surface side of the photovoltaic cell 20 peels.

  Moreover, in the solar cell module 1B according to the modified example 2, the adhesive tape 90 includes a base material layer 91 formed of a resin material and an adhesive layer 92 provided on one surface of the base material layer 91. The layer 92 may be formed in a region in contact with the wiring member 70.

  According to the said structure, when peeling the adhesive tape 90 from the photovoltaic cell 20, it can peel with small force and it can suppress that the wiring member 70 deform | transforms. Further, it becomes difficult to expose an extra adhesive layer that does not contribute to adhesion, and it is possible to suppress the adhesion of dust or dust to the adhesive tape 90.

[7. Configuration of Solar Cell Module According to Modification 3]
11A is an enlarged plan view of a solar cell module 1C according to Modification 3 of the embodiment, and FIG. 11B is a cross-sectional view taken along line XIb-XIb in FIG.

  The solar battery cell 20 of the solar battery module 1C according to Modification 3 has a rectangular shape when viewed from the back side. Specifically, the solar battery cell 20 has four corners C2, and each corner C2 has a right angle.

  Also in the modification 3, since the wiring members 70 adjacent in the Y-axis direction are connected by the adhesive tape 90, the contact area between the adhesive tape 90 and the solar battery cell 20 can be reduced. Therefore, the contact area between the adhesive tape 90 and the electrode on the back surface side of the solar battery cell 20 can be reduced. Thereby, when peeling adhesive tape 90 from the photovoltaic cell 20, for example, it can suppress that the electrode of the back surface side of the photovoltaic cell 20 peels.

  Moreover, in 1 C of solar cell modules which concern on the modification 3, when the photovoltaic cell 20 is planarly viewed from the back surface side, the photovoltaic cell 20 is rectangular shape.

  According to the said structure, the light-receiving area of the photovoltaic cell 20 can be increased, and the characteristic of the solar cell module 1 can be improved.

(Other variations)
As mentioned above, although solar cell module 1-1C concerning this invention was demonstrated based on embodiment and its modification, this invention is not limited to the said embodiment. Forms obtained by subjecting each embodiment to various modifications conceived by those skilled in the art, and forms realized by arbitrarily combining the components and functions in each embodiment without departing from the spirit of the present invention It is included in the present invention.

  For example, in the solar cell module 1 of the embodiment, when viewed from the back side, the width of the adhesive tape 90a is smaller than the width of the wiring member 70a, but the width of the adhesive tape 90a is not limited thereto. The width of the wiring member 70a may be the same. Further, the width of the adhesive tape 90a may be wider than the wiring member 70a as long as it does not overlap the finger electrodes 23a and 24a.

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C Solar cell module 13 Filling member on the surface side 14 Filling member on the back surface 20, 20A, 20B, 20C, 20D Solar cell 20a Light-receiving surface (front surface)
20b Back surface 21, 27n n-type semiconductor layer 22 p-type semiconductor layer 23 n-side electrode 23a finger electrode 23b bus bar electrode 24 p-side electrode 24a finger electrode 24b bus bar electrode 26 semiconductor substrate 70, 70a, 70b wiring member 90 adhesive tape 91 base material Layer 92 Adhesive layer

Claims (6)

A solar cell module comprising a plurality of solar cells, and a plurality of wiring members that electrically connect the plurality of solar cells,
The plurality of solar cells are arranged in a matrix with a gap in each direction of a first direction and a second direction orthogonal to the first direction,
Each of the solar cells includes a substrate made of a semiconductor material, an n-type semiconductor layer formed on a surface on the back surface side of the substrate that is the same side as the back surface side of the solar cell, and the surface. A p-type semiconductor layer formed in a region where the n-type semiconductor layer is not formed, an n-side electrode formed on the n-type semiconductor layer, and a p-type formed on the p-type semiconductor layer. Side electrodes,
Each of the plurality of wiring members is arranged between the plurality of solar cells arranged in the first direction, and a predetermined sun among the plurality of solar cells arranged in the first direction. Connected to the n-side electrode of the battery cell and the p-side electrode of the solar battery cell located next to the predetermined solar battery cell;
The plurality of solar cells arranged in the first direction are integrated by being connected by the plurality of wiring members,
The plurality of integrated solar cells and the plurality of wiring members are arranged in a plurality spaced apart from each other in the second direction,
The solar cell module further includes an adhesive tape disposed between the plurality of wiring members adjacent in the second direction,
The plurality of wiring members adjacent in the second direction are connected by the adhesive tape,
Solar cell module. Each of the n-side electrode and the p-side electrode has a comb-like shape, and has a plurality of finger electrodes extending along the first direction, and a bus bar electrode connected to the plurality of finger electrodes. ,
When the solar cell module is viewed in plan from the back side, the adhesive tape does not overlap the finger electrode but overlaps a part of the wiring member.
The solar cell module according to claim 1. The adhesive tape has a base material layer formed of a resin material and an adhesive layer provided on one surface of the base material layer,
The adhesive layer is formed in a region in contact with the wiring member.
The solar cell module according to claim 1 or 2. The solar battery cell is rectangular when the solar battery cell is viewed in plan from the back side.
The solar cell module of any one of Claims 1-3. A plurality of solar cells arranged in a matrix are electrically connected to the first direction and a second direction orthogonal to the first direction, and the solar cells are electrically connected. A plurality of wiring members, and a solar cell module manufacturing method comprising:
The plurality of solar cells adjacent to each other in the first direction are connected and integrated by the wiring member, and the integrated plurality of solar cells and the wiring member are spaced from each other in the second direction. An arrangement process in which a plurality of arrangements are made;
A connecting step of arranging an adhesive tape between the plurality of wiring members adjacent in the second direction, and connecting the plurality of wiring members adjacent in the second direction with the adhesive tape;
The manufacturing method of the solar cell module containing this. The method for manufacturing a solar cell module according to claim 5, further comprising a step of pressure-bonding a filling member to the front surface side and the back surface side of the solar cells after the connecting step.

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