JP4958187B2 - Solar cell, wiring sheet, solar cell with wiring sheet and solar cell module - Google Patents

Description

  The present invention relates to a solar battery cell, a wiring sheet, a solar battery cell with a wiring sheet, and a solar battery module.

In recent years, development of clean energy has been demanded due to problems of depletion of energy resources and global environmental problems such as an increase in CO _{2 in} the atmosphere. In particular, solar power generation using solar cell modules is a new energy source. It has been developed, put into practical use, and is on the path of development.

  As a solar cell constituting such a solar cell module, conventionally, for example, a pn junction is formed by diffusing impurities of a conductivity type opposite to that of a silicon substrate on a light receiving surface of a single crystal or polycrystalline silicon substrate. However, double-sided electrode type solar cells in which electrodes are formed on the light receiving surface of the silicon substrate and the back surface on the opposite side are mainly used.

  In recent years, a so-called back electrode type solar cell in which both a p-type electrode and an n-type electrode are formed on the back surface of a silicon substrate has been developed, and a wiring material is provided on an insulating substrate. A method of forming a solar cell module in which a solar cell with a wiring sheet in which back electrode type solar cells are electrically connected to each other with a wiring sheet is sealed in a sealing material has also been proposed (see, for example, Patent Document 1). ).

  FIG. 13A shows a schematic plan view of the back surface of an example of a conventional back electrode type solar battery cell, and FIG. 13B is a schematic cross-sectional view taken along 13b-13b of FIG. 13A. Indicates.

  Here, as shown in FIG. 13A, a conventional back electrode type solar battery cell 100 has a band-shaped first conductivity type on the back surface of a semiconductor substrate 11 such as a silicon substrate having n-type or p-type conductivity. The electrodes 14 and the strip-like second conductivity type electrodes 15 are alternately arranged in the same number one by one, and these electrodes are arranged in the first conductivity type from the left side to the right side of the semiconductor substrate 11 in FIG. The arrangement starts from the electrode 14 and the arrangement ends at the second conductivity type electrode 15.

  Further, as shown in FIG. 13 (b), the first conductivity type impurity electrically connected to the first conductivity type electrode 14 is formed on the back surface of the semiconductor substrate 11 of the conventional back electrode type solar battery cell 100. A diffusion region 12 is formed, and a second conductivity type impurity diffusion region 13 electrically connected to the second conductivity type electrode 15 is formed.

  Further, a passivation film 16 is formed on the back surface of the semiconductor substrate 11, and the first conductivity type electrode 14 and the second conductivity type electrode 15 pass through the passivation film 16 and the first conductivity type impurity diffusion region 12 and the second conductivity type, respectively. Each of the conductive impurity diffusion regions 13 is electrically connected.

  Further, a texture structure 18 that is, for example, a pyramidal uneven structure is formed on the light receiving surface opposite to the back surface of the semiconductor substrate 11, and an antireflection film 17 is formed on the texture structure 18.

  In FIG. 14, the typical top view of the back surface of the other example of the conventional back electrode type photovoltaic cell 100 is shown. Here, the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface of the semiconductor substrate 11 of the conventional back electrode type solar battery cell 100 are each formed in a dot shape, and the dot-shaped first conductivity type. The mold electrodes 14 and dot-like second conductivity type electrodes 15 are arranged in the vertical direction of FIG. Further, the same number of rows of dot-shaped first conductivity type electrodes 14 extending in the vertical direction of FIG. 14 and rows of dot-shaped second conductivity type electrodes 15 are alternately arranged, one by one. From the left side to the right side of the semiconductor substrate 11, the arrangement starts from the column of the first conductivity type electrodes 14, and the arrangement ends at the column of the second conductivity type electrodes 15.

  FIG. 15A shows a schematic plan view of the surface of an example of a conventional wiring sheet, and FIG. 15B shows a schematic cross-sectional view taken along 15b-15b of FIG. 15A. .

  As shown in FIGS. 15A and 15B, the conventional wiring sheet 200 includes an insulating base 21 and a first conductive type wiring 22 installed on the surface of the insulating base 21. And a second conductivity type wiring 23 and a connection wiring 24.

  Here, the first conductivity type wiring 22, the second conductivity type wiring 23, and the connection wiring 24 are electrically conductive, respectively, and the first conductivity type wiring 22, the second conductivity type wiring 23, and the connection wiring are respectively provided. Each 24 has a belt shape. The strip-shaped first conductivity type wiring 22 and the strip-shaped second conductivity type wiring 23 are electrically connected by a connection wiring 24 extending in a direction orthogonal to the extending direction of these wiring members. .

  Further, in the conventional wiring sheet 200, the strip-shaped first conductive type wiring 22 and the strip-shaped second conductive type wiring 23 that extend in the left-right direction in FIG. Are arranged in the vertical direction of FIG. 15A, and these wiring materials start from the first conductivity type wiring 22 from the upper side to the lower side of FIG. The arrangement is completed by the mold wiring 23.

  FIG. 16 (a) shows a plurality of conventional back electrode type solar cells 100 shown in FIGS. 13 (a) and 13 (b), and a conventional wiring sheet 200 shown in FIGS. 15 (a) and 15 (b). FIG. 16 (b) shows a schematic plan view of an example of a conventional photovoltaic cell with a wiring sheet configured by electrical connection when viewed from the light-receiving surface side. FIG. A schematic cross-sectional view along -16b is shown.

  As shown in FIGS. 16 (a) and 16 (b), a conventional solar cell with a wiring sheet includes a back surface side of a back electrode type solar cell 100 and a wiring material of an insulating substrate 21 of the wiring sheet 200. The back electrode type solar battery cell 100 is installed on the wiring sheet 200 so that the installation side faces each other.

  That is, as shown in FIG. 16B, the first conductivity type electrode 14 on the back surface of the back electrode type solar cell 100 is provided on the surface of the insulating substrate 21 of the wiring sheet 200. The second conductive type electrode 15 on the back surface of the back electrode type solar battery cell 100 is electrically connected to the wiring for wiring 22 and is installed on the surface of the insulating substrate 21 of the wiring sheet 200. It is electrically connected to the wiring 23 for use.

  And the conventional solar cell module is produced by sealing said photovoltaic cell with a wiring sheet in a sealing material.

JP 2005-340362 A

  In the production of the above-described conventional photovoltaic cell with a wiring sheet, the wiring sheet 200 is placed on the stage so that the first conductive type wiring 22 and the second conductive type wiring 23 of the wiring sheet 200 face upward. Then, the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface of the back electrode type solar cell 100 are electrically connected to the first conductivity type wire 22 and the second conductivity type wire 23 of the wiring sheet 200, respectively. The back electrode type solar cells 100 are placed on the wiring sheet 200 so that the light receiving surface of the back electrode type solar cells 100 faces upward.

  However, there is a case where nothing is provided on the light-receiving surface of the back electrode type solar battery cell 100 as an indication of the arrangement of the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface. . Also, even if there are some guidelines, the arrangement direction may be easily mistaken.

  Therefore, when the back electrode type solar cell 100 is installed on the wiring sheet 200 by the above method, the first conductivity type electrode 14 of the back electrode type solar cell 100 is the second conductivity type of the wiring sheet 200. There is a problem that the second conductive type electrode 15 of the back electrode type solar battery cell 100 is electrically connected to the first conductive type wiring 22 of the wiring sheet 200 because the second conductive type electrode 15 is electrically connected to the wiring for wiring 23. .

  Once the electrode of the back electrode type solar battery cell 100 and the wiring material of the wiring sheet 200 are once connected, it is difficult to remove this, so it was even discarded as a defective product.

  In addition, on the light receiving surface of the back electrode type solar cell 100, a mark or the like indicating the arrangement of the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface of the back electrode type solar cell 100 is formed. In this case, since the number of manufacturing steps increases, the manufacturing efficiency of the solar cell with wiring sheet, the solar cell string, and the solar cell module is deteriorated.

  In view of the above circumstances, an object of the present invention is to provide a solar cell and a wiring sheet that can efficiently produce the solar cell with the wiring sheet and the solar battery module, and a solar with a wiring sheet using these. The object is to provide a battery cell and a solar battery module.

  The present invention includes a semiconductor substrate, a first conductivity type impurity diffusion region formed on one surface of the semiconductor substrate, a second conductivity type impurity diffusion region formed on one surface of the semiconductor substrate, and a first conductivity type. A first conductivity type electrode, comprising: a first conductivity type electrode electrically connected to the impurity diffusion region; and a second conductivity type electrode electrically connected to the second conductivity type impurity diffusion region. And the second conductivity type electrode have rotational symmetry, and electrodes located on both sides of the electrode pattern are electrically connected to the impurity diffusion region of the same conductivity type. It is a solar battery cell.

  The present invention also provides a first conductivity type electrode electrically connected to the first conductivity type impurity diffusion region of the semiconductor substrate and a second conductivity electrically connected to the second conductivity type impurity diffusion region of the semiconductor substrate. A wiring sheet for installing a solar cell provided with a mold electrode, comprising: an insulating base material; and a wiring material placed on one surface of the insulating base material. 1st conductivity type wiring including the 1st conductivity type wiring for electrically connecting to the electrode for 1 conductivity type, and 2nd conductivity type wiring for electrically connecting to the electrode for 2nd conductivity type And the second conductivity type wiring are rotationally symmetric, and the wiring materials located on both sides of the solar cell connection wiring pattern are for the same conductivity type of the solar cells. It is a wiring sheet which is connected to an electrode.

  In addition, the present invention includes the above-described solar battery cell and the above-described wiring sheet, wherein the first conductive-type wiring of the wiring sheet and the first conductive-type electrode of the solar battery cell are electrically connected, It is a solar cell with a wiring sheet in which the second conductive type wiring of the wiring sheet and the second conductive type electrode of the solar cell are electrically connected.

  In addition, the present invention electrically connects the semiconductor sheet, the first conductivity type impurity diffusion region and the second conductivity type impurity diffusion region formed in the semiconductor substrate, and the first conductivity type impurity diffusion region to the wiring sheet. A solar cell with a wiring sheet in which a solar cell having a connected first conductivity type electrode and a second conductivity type electrode electrically connected to a second conductivity type impurity diffusion region is installed. The first conductive type wiring of the wiring sheet and the first conductive type electrode of the solar battery cell are electrically connected, and the second conductive type wiring of the wiring sheet and the second conductive type of the solar battery cell are connected. It is a photovoltaic cell with a wiring sheet by which the electrode for electricity is electrically connected.

  Moreover, this invention is a photovoltaic cell with a wiring sheet formed by electrically connecting said photovoltaic cells with a wiring sheet.

  Furthermore, the present invention is a solar cell module in which the solar cell with a wiring sheet is sealed with a sealing material.

  ADVANTAGE OF THE INVENTION According to this invention, the photovoltaic cell and wiring sheet which can manufacture efficiently the manufacturing efficiency of the photovoltaic cell with a wiring sheet and a solar cell module, and the photovoltaic cell with a wiring sheet and solar cell module using these are provided. Can be provided.

(A) is a schematic top view of the back surface of an example of the back electrode type photovoltaic cell of this invention, (b) is typical sectional drawing along 1b-1b of (a). (A) is the typical top view which looked at an example of the wiring sheet of this invention from the installation side of a wiring material, (b) is typical sectional drawing along 2b-2b of (a). (A) is a typical top view when an example of the photovoltaic cell with a wiring sheet of this invention is seen from the light-receiving surface side, and is a typical cross section along 3b-3b in (a). FIG. FIG. 2 is a schematic plan view when the back surface of the back electrode type solar battery cell shown in FIG. (A) And (b) is typical sectional drawing illustrating an example of the manufacturing method of an example of the solar cell module of this invention. (A) And (b) is typical sectional drawing illustrating another example of the manufacturing method of an example of the solar cell module of this invention. It is a typical top view of the back of another example of the back electrode type solar cell of the present invention. FIG. 8 is a schematic plan view when the back surface of the back electrode type solar cell shown in FIG. 7 is rotated by 180 °. It is a typical top view of the back of another example of the back electrode type photovoltaic cell of the present invention. FIG. 10 is a schematic plan view when the back surface of the back electrode type solar cell shown in FIG. 9 is rotated 90 ° or 180 °. (A)-(d) is a schematic diagram illustrating the manufacturing process of the other example of the photovoltaic cell with a wiring sheet of this invention. FIG. 11C and FIG. 11D are schematic views of an example of the solar battery string of the present invention formed by electrically connecting the solar cells with wiring sheets configured as shown in FIG. 11D from the light receiving surface side. It is a top view. (A) is a typical top view of the back surface of an example of the conventional back electrode type photovoltaic cell, (b) is a typical sectional view along 13b-13b of (a). It is a typical top view of the back surface of the other example of the conventional back electrode type photovoltaic cell. (A) is a typical top view of the surface of an example of the conventional wiring sheet, (b) is typical sectional drawing which followed 15b-15b of (a). (A) is a typical top view when an example of the conventional photovoltaic cell with a wiring sheet is seen from the light-receiving surface side, (b) is a typical sectional view along 16b-16b in (a). It is. (A)-(d) is a typical top view of the back surface of an example of the back electrode type photovoltaic cell of this invention.

  Embodiments of the present invention will be described below. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts.

  Here, in this specification, the solar cell means a semiconductor substrate such as a silicon substrate that has been subjected to element formation such as p-type impurity diffusion region formation or n-type impurity diffusion region formation. Moreover, the photovoltaic cell with a wiring sheet means what connected the wiring sheet to the photovoltaic cell, and the solar cell module means what sealed the photovoltaic cell with a wiring sheet with the sealing material. Moreover, a solar cell string means the thing containing the structure by which at least a pair of photovoltaic cell was connected in series, and included both the form of the form of the photovoltaic cell with a wiring sheet, and the form of a photovoltaic module.

<Back electrode type solar cell>
FIG. 1A shows a schematic plan view of an example of the back electrode type solar battery cell of the present invention, and FIG. 1B shows a schematic cross-sectional view along 1b-1b of FIG. 1A. Show.

  Here, as shown in FIG. 1A, the back electrode type solar battery cell 10 of the present invention has a strip-like first conductivity type electrode 14 on the back surface of a semiconductor substrate 11 having n-type or p-type conductivity. And the strip-shaped second conductivity type electrodes 15 are alternately arranged one by one, and these electrodes extend from the first conductivity type electrode 14 from the left side to the right side of the semiconductor substrate 11 in FIG. The arrangement starts and the arrangement ends at the first conductivity type electrode 14. That is, the number of first conductivity type electrodes 14 is one more than the number of second conductivity type electrodes 15.

  Accordingly, when only the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface of the back electrode type solar cell 10 of the present invention shown in FIG. The electrode pattern (an arrangement pattern including only the first conductivity type electrode 14 and the second conductivity type electrode 15 when it is assumed that the semiconductor substrate 11 does not exist in FIG. 1A) has rotational symmetry. Here, rotational symmetry originally means a property such that when a certain figure is rotated at a certain rotation angle, it overlaps the original figure. For example, in the electrode pattern shown in FIG. 1A, when the electrode pattern is rotated by 180 °, it overlaps the original electrode pattern.

  The electrodes located on both sides of the electrode pattern (both ends in the left-right direction in FIG. 1 (a), which is the arrangement direction of the first conductivity type electrode 14 and the second conductivity type electrode 15) This is a mold electrode 14.

  Further, as shown in FIG. 1B, a first conductivity type impurity diffusion region formed by diffusing a first conductivity type impurity on the back surface of the semiconductor substrate 11 of the back electrode type solar cell 10 of the present invention. 12 is formed, and a second conductivity type impurity diffusion region 13 formed by diffusing the second conductivity type impurity is formed.

  Further, a passivation film 16 is formed on the back surface of the semiconductor substrate 11, and the first conductivity type electrode 14 is electrically connected to the first conductivity type impurity diffusion region 12 through a contact hole provided in the passivation film 16. The second conductivity type electrode 15 is electrically connected to the second conductivity type impurity diffusion region 13 through another contact hole provided in the passivation film 16.

  In addition, a texture structure 18 that is, for example, a pyramidal concavo-convex structure is formed on the light-receiving surface opposite to the back surface of the semiconductor substrate 11 of the back electrode type solar cell 10 of the present invention, and is reflected on the texture structure 18. A prevention film 17 is formed.

  Here, as the semiconductor substrate 11, for example, a silicon substrate made of polycrystalline silicon or single crystal silicon having n-type or p-type conductivity can be used.

  In addition, as the first conductivity type electrode 14 and the second conductivity type electrode 15, for example, electrodes made of a metal such as silver can be used.

  Further, on at least a part of the surface of the first conductivity type electrode 14 and / or at least a part of the surface of the second conductivity type electrode 15 of the back electrode type solar cell 10, for example, nickel (Ni), gold An electrically conductive material containing at least one selected from the group consisting of (Au), platinum (Pt), palladium (Pd), silver (Ag), tin (Sn), SnPb solder, and ITO (Indium Tin Oxide) May be installed. In this case, the electrical connection between the wiring material of the wiring sheet, which will be described later, and the electrode of the back electrode type solar battery cell 10 can be improved, and the weather resistance of the electrode of the back electrode type solar battery cell 10 can be improved. It tends to be possible.

  Further, at least a part of the surface of the first conductivity type electrode 14 and / or at least a part of the surface of the second conductivity type electrode 15 of the back electrode type solar cell 10 is subjected to a surface treatment such as a blackening treatment, for example. May be applied.

  As the passivation film 16, for example, a silicon oxide film, a silicon nitride film, or a stacked body of a silicon oxide film and a silicon nitride film can be used.

  Further, as the antireflection film 17, for example, a silicon nitride film or the like can be used.

  When the first conductivity type is n-type, phosphorus or the like is used as the first conductivity type impurity. When the first conductivity type is p-type, the first conductivity type impurity is, for example, Boron or the like is used.

  When the second conductivity type is n-type, for example, phosphorus is used as the second conductivity type impurity. When the second conductivity type is p-type, the second conductivity type impurity is, for example, Boron or the like is used.

  The first conductivity type and the second conductivity type may be opposite to each other. When the first conductivity type is n-type, the second conductivity type is p-type, and the first conductivity type is p-type. In this case, the second conductivity type is n-type.

  In the back electrode type solar cell 10 having the above configuration, the first conductivity type impurity diffusion region 12 or the second conductivity type impurity diffusion region 13 is formed on the back surface of the semiconductor substrate 11 having n-type or p-type conductivity. A plurality of pn junctions are formed at the interface between the semiconductor substrate 11 and the inside of the semiconductor substrate 11. Regardless of whether the semiconductor substrate 11 has an n-type or p-type conductivity, the first conductivity type impurity diffusion region 12 and the second conductivity type impurity diffusion region 13 are each joined to the inside of the semiconductor substrate 11. Thus, the first conductivity type electrode 14 and the second conductivity type electrode 15 are respectively electrodes corresponding to a plurality of pn junctions formed on the back surface of the semiconductor substrate 11.

  The concept of the solar battery cell in the present invention has a configuration in which both the first conductivity type electrode 14 and the second conductivity type electrode 15 are formed only on one surface (back surface) of the semiconductor substrate 11 described above. In addition to back electrode type solar cells, so-called back contact type solar cells such as MWT (Metal Wrap Through) cells (solar cells having a part of electrodes arranged in through holes provided in a semiconductor substrate) Solar cells having a structure in which current is taken out from the back surface opposite to the light receiving surface of the solar cells is also included.

<Wiring sheet>
FIG. 2 (a) shows a schematic plan view of an example of the wiring sheet of the present invention as viewed from the wiring material installation side, and FIG. 2 (b) shows a schematic view along 2b-2b of FIG. 2 (a). FIG.

  As shown in FIG. 2A, the wiring sheet 20 includes an insulating base material 21 and a wiring material installed on the surface of the insulating base material 21. Here, the wiring material is composed of a first conductivity type wiring 22, a second conductivity type wiring 23, and a connection wiring 24.

  Here, the first conductivity type wiring 22, the second conductivity type wiring 23, and the connection wiring 24 are electrically conductive, respectively, and the first conductivity type wiring 22, the second conductivity type wiring 23, and the connection wiring are respectively provided. Each 24 has a belt shape. The strip-shaped first conductivity type wiring 22 and the strip-shaped second conductivity type wiring 23 are electrically connected by a connection wiring 24 extending in a direction orthogonal to the extending direction of these wiring members. .

  Further, in the wiring sheet 20, the strip-shaped first conductive type wiring 22 and the strip-shaped second conductive type wiring 23 that extend in the left-right direction in FIG. 2A. These wiring members are arranged from the first conductivity type wiring 22 from the upper side to the lower side in FIG. 2A, and are used for the first conductivity type. The arrangement ends with the wiring 22.

  Therefore, only the first conductive type wiring 22 and the second conductive type wiring 23 on the surface of the insulating base material 21 of the wiring sheet 20 of the present invention shown in FIG. When the connection wiring pattern is used, the first conductive type wiring 22 and the second wiring when assuming that the insulating base material 21 and the connection wiring 24 are not present in the solar cell connection wiring pattern (FIG. 2A). The arrangement pattern consisting only of the conductive type wiring 23) has rotational symmetry. That is, when the solar cell connection wiring pattern is rotated by 180 °, it overlaps the original solar cell connection wiring pattern. It should be noted that the first conductive type wiring 22 and the second conductive type wiring 23 are connected to the connection wiring 24, or the leading ends of the first conductive type wiring 22 and the second conductive type wiring 23 and the connection wiring. In the portion separated from 24, when it is rotated by 180 °, it does not overlap with the original pattern. However, in the concept of the present invention, such a case is also included as a pattern having rotational symmetry. In short, in the present invention, a back electrode type solar cell provided with a first conductivity type electrode and a second conductivity type electrode on one surface side, a first conductivity type wiring, and a second conductivity type electrode. From the position where the first and second conductivity type electrodes and the first and second conductivity type wires correspond to each other with the same conductivity type between the wiring sheet provided on one surface side, the two are relatively other than 360 °. When rotating at an angle, the first and second conductivity type electrodes and the first and second conductivity type wirings can be connected in the same conductivity type at a position different from that position. If there is, it will have rotational symmetry.

  And the wiring material located on both sides of the solar cell connection wiring pattern (both ends in the vertical direction of FIG. 2A, which is the arrangement direction of the first conductive type wiring 22 and the second conductive type wiring 23), This is a strip-shaped first conductivity type wiring 22 connected to the same conductivity type electrode (in this example, the first conductivity type electrode 14) of the back electrode type solar cell 10.

  Here, the material of the insulating base material 21 can be used without particular limitation as long as it is an electrically insulating material. For example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), A material containing at least one resin selected from the group consisting of polyphenylene sulfide (PPS), polyvinyl fluoride (PVF) and polyimide (Polyimide) can be used.

  Moreover, the thickness of the insulating base material 21 is not specifically limited, For example, it can be 25 micrometers or more and 150 micrometers or less.

  The insulating substrate 21 may have a single-layer structure consisting of only one layer or a multi-layer structure consisting of two or more layers.

  Further, the materials of the first conductivity type wiring 22, the second conductivity type wiring 23, and the connection wiring 24 can be used without particular limitation as long as they are made of an electrically conductive material. A metal containing at least one selected from the group consisting of aluminum and silver can be used.

  Further, the thicknesses of the first conductivity type wiring 22, the second conductivity type wiring 23, and the connection wiring 24 are not particularly limited, and may be, for example, 10 μm or more and 35 μm or less.

  Needless to say, the shapes of the first conductivity type wiring 22, the second conductivity type wiring 23, and the connection wiring 24 are not limited to the shapes described above, and can be set as appropriate.

  Further, at least a part of the surface of the first conductivity type wiring 22 and / or at least a part of the surface of the second conductivity type wiring 23, for example, nickel (Ni), gold (Au), platinum (Pt) An electrically conductive material containing at least one selected from the group consisting of palladium (Pd), silver (Ag), tin (Sn), SnPb solder, and ITO (Indium Tin Oxide) may be provided. In this case, the electrical connection between the wiring material of the wiring sheet 20 and the electrode of the back electrode type solar battery cell 10 is improved, and the weather resistance of the wiring material of the wiring sheet 20 tends to be improved. .

  Further, at least a part of the surface of the first conductivity type wiring 22 and / or at least a part of the surface of the second conductivity type wiring 23 may be subjected to a surface treatment such as a blackening treatment.

  Each of the first conductivity type wiring 22, the second conductivity type wiring 23, and the connection wiring 24 may have a single-layer structure composed of only one layer or a multi-layer structure composed of two or more layers. Also good.

<Solar cell with wiring sheet>
3 (a), a plurality of back electrode type solar cells 10 shown in FIG. 1 (a) and FIG. 1 (b) are electrically connected by a wiring sheet 20 shown in FIG. 2 (a) and FIG. 2 (b). A schematic plan view of an example of the solar cell with a wiring sheet of the present invention that is connected and viewed from the light-receiving surface side is shown, and FIG. 3 (b) shows a diagram 3b-3b of FIG. 3 (a). A schematic cross-sectional view along is shown.

  As shown in FIG. 3A and FIG. 3B, the solar cell with a wiring sheet of the present invention has a wiring on the back surface side of the back electrode type solar cell 10 and the insulating base material 21 of the wiring sheet 20. It is configured by installing the back electrode type solar cell 10 on the wiring sheet 20 so as to face the material installation side.

  That is, as shown in FIG. 3 (b), the first conductivity type electrode 14 on the back surface of the back electrode type solar cell 10 is disposed on the surface of the insulating substrate 21 of the wiring sheet 20. The second conductivity type electrode 15 on the back surface of the back electrode type solar battery cell 10 is electrically connected to the wiring for wiring 22 and is installed on the surface of the insulating substrate 21 of the wiring sheet 20. It is electrically connected to the wiring 23 for use.

  Here, in the back electrode type solar cell 10, as described above, the electrode pattern composed of the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface of the back electrode type solar cell 10 rotates. The electrode which has symmetry and is located on both sides of the electrode pattern is a strip-shaped first conductivity type electrode 14 (see FIG. 1A).

  Therefore, in the back electrode type solar cell 10, as shown in the schematic plan view of FIG. 4, even when the back electrode type solar cell 10 is rotated 180 °, the back surface of the back electrode type solar cell 10. The electrode pattern composed of the first conductivity type electrode 14 and the second conductivity type electrode 15 is the same as before the rotation.

  Therefore, even if nothing is provided on the light receiving surface of the back electrode type solar battery cell 10 to indicate the arrangement of the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface, When the solar cell 10 is installed on the wiring sheet 20, the first conductivity type electrode 14 of the back electrode type solar cell 10 is electrically connected to the second conductivity type wiring 23 of the wiring sheet 20, Since the problem that the second conductivity type electrode 15 of the back electrode type solar cell 10 is electrically connected to the first conductivity type wiring 22 of the wiring sheet 20 is less likely to occur, the solar cell with the wiring sheet The production efficiency of the cell and the solar cell module described later can be improved as compared with the conventional one.

  Further, a mark or the like indicating the arrangement of the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface of the back electrode type solar cell 10 is formed on the light receiving surface of the back electrode type solar cell 10. The need can also be reduced.

  In the wiring sheet 20, the first conductivity type electrode 14 on the back surface of the back electrode type solar cell 10 is electrically connected to the first conductivity type wire 22, and the second conductivity type electrode 15 is the second electrode. A solar cell having rotational symmetry composed of the first conductive type wiring 22 and the second conductive type wiring 23 on the surface of the insulating base material 21 so as to be electrically connected to the conductive type wiring 23. A connection wiring pattern is configured.

  Therefore, the solar cell connection wiring pattern on the surface of the insulating substrate 21 of the wiring sheet 20 corresponds to any of the electrode patterns before and after the rotation of the back electrode type solar cell 10. The electrical connection with the electrode of the solar cell 10 is possible.

  Here, the current generated by the light incident on the light receiving surface of the back electrode type solar cell 10 of the solar cell with wiring sheet is the first conductivity type electrode 14 and the second electrode of the back electrode type solar cell 10. The first conductive type wiring 22 and the second conductive type wiring 23 of the wiring sheet 20 are taken out from the conductive type electrode 15.

  Then, the current extracted to the first conductivity type wiring 22 and the second conductivity type wiring 23 of the wiring sheet 20 is transmitted from the connection wiring 24 located at the end of the wiring material of the wiring sheet 20 to the solar with wiring sheet. It will be taken out of the battery cell.

  In addition, the joining method of the 1st conductivity type electrode 14 of the back electrode type solar cell 10 and the 1st conductivity type wiring 22 of the wiring sheet 20, and the 2nd conductivity type electrode 15 of the back electrode type solar cell 10 and The method for joining the wiring sheet 20 to the second conductive type wiring 23 is not particularly limited. For example, solder, conductive adhesive, anisotropic conductive film (ACF), anisotropic conductive paste ( Bonding can be performed using at least one adhesive selected from the group consisting of ACP (Anisotropic Conductive Paste) and an insulating adhesive.

  For example, solder, a conductive adhesive, an anisotropic conductive film (ACF: Anisotropic Conductive Film), anisotropic conductive on the back surface of the back electrode type solar cell 10 and / or the surface of the insulating substrate 21 of the wiring sheet 20. After applying at least one adhesive selected from the group consisting of an adhesive paste (ACP: Anisotropic Conductive Paste) and an insulating adhesive, the first conductive type electrode 14 and the first conductive type wiring 22 are electrically connected. Back electrode type solar cells on the surface of the insulating substrate 21 of the wiring sheet 20 so that the second conductivity type electrode 15 and the second conductivity type wiring 23 are electrically connected to each other. 10 is installed.

  Then, for example, the back electrode type solar battery cell 10 and the wiring sheet 20 are utilized by using the adhesive force of the above-mentioned adhesive, for example, by performing heat treatment while pressing the back electrode type solar battery cell 10 and the wiring sheet 20. And join. As a result, the first conductivity type electrode 14 of the back electrode type solar battery cell 10 and the first conductivity type wiring 22 of the wiring sheet 20 are fixed and joined in an electrically connected state, and the back electrode The second conductivity type electrode 15 of the solar cell 10 and the second conductivity type wiring 23 of the wiring sheet 20 are fixed and joined in an electrically connected state.

  In addition, the adhesive having electrical conductivity such as the solder, the conductive adhesive, the anisotropic conductive film and the anisotropic conductive paste can be installed at a position where no short circuit occurs in the solar cell with the wiring sheet. Needless to say.

  Moreover, it cannot be overemphasized that the adhesive material which has electrical insulation like said insulating adhesive can be installed in the position which does not inhibit the electrical continuity of the photovoltaic cell with a wiring sheet.

  Moreover, it can also join using the sealing material mentioned later, without using said adhesive material.

  In addition, the photovoltaic cell with a wiring sheet of the said structure is the connection wiring 24 exposed outside the photovoltaic cell with one wiring sheet, and the connection exposed outside the photovoltaic cell with the other wiring sheet An example of the solar battery string (solar battery cell with a wiring sheet) of the present invention can be formed by electrically connecting the wiring 24 with a conductive connecting member.

<Solar cell module>
FIG. 5A and FIG. 5B are schematic cross-sectional views illustrating an example of a manufacturing method of an example of the solar cell module of the present invention. Hereinafter, with reference to FIG. 5A and FIG. 5B, an example of a manufacturing method of an example of the solar cell module of the present invention will be described.

  In the following, as an example of the solar cell module of the present invention, a solar cell having a configuration in which a solar cell with a wiring sheet having the configuration shown in FIGS. 3 (a) and 3 (b) is sealed in a sealing material. Although a module is demonstrated, it cannot be overemphasized that the structure of the solar cell module of this invention is not limited to this structure.

  First, as shown to Fig.5 (a), the 1st transparent resin 31a is provided in the back electrode type photovoltaic cell side of the photovoltaic cell with a wiring sheet of the structure shown to Fig.3 (a) and FIG.3 (b). In addition to installing the transparent substrate 30, a back surface protection sheet 32 having a second transparent resin 31 b is installed on the wiring sheet side of the solar cell with the wiring sheet having the configuration shown in FIGS. 3 (a) and 3 (b). To do.

  Next, in a state where the first transparent resin 31a is pressure-bonded to the back electrode type solar cell of the solar cell with the wiring sheet, and the second transparent resin 31b is pressure-bonded to the wiring sheet of the solar cell with the wiring sheet. By performing the heat treatment, the first transparent resin 31a and the second transparent resin 31b are integrated and cured. Thereby, as shown in FIG.5 (b), the said photovoltaic cell with a wiring sheet is sealed in the sealing material 31 formed by integrating the 1st transparent resin 31a and the 2nd transparent resin 31b. An example of the solar cell module of the present invention is manufactured.

  In the solar cell module shown in FIG. 5B, the back electrode type solar cell is strongly pressed against the wiring sheet by the shrinkage force of the sealing material 31, and the first conductivity type electrode 14 of the back electrode type solar cell and The crimping of the wiring sheet with the first conductive type wiring 22 and the crimping of the second conductive type electrode 15 of the back electrode type solar battery cell and the second conductive type wiring 23 of the wiring sheet are strengthened, respectively. A good electrical connection is obtained between the electrode of the solar cell and the wiring of the wiring sheet.

  Here, the pressure bonding and heat treatment for sealing the solar cell with wiring sheet in the sealing material 31 can be performed using, for example, a vacuum pressure bonding and heat treatment apparatus called a laminator. For example, the first transparent resin 31a and the second transparent resin 31b are thermally deformed by a laminator, and the first transparent resin 31a and the second transparent resin 31b are thermally cured, so that these transparent resins are integrated. The sealing material 31 is formed, and the solar cell with wiring sheet is encapsulated in the sealing material 31 to be sealed.

  Note that the vacuum pressure bonding is a process of pressure bonding in an atmosphere reduced in pressure from atmospheric pressure. Here, when vacuum pressure bonding is used as the pressure bonding method, it is difficult to form a gap between the first transparent resin 31a and the second transparent resin 31b, and the first transparent resin 31a and the second transparent resin are not formed. This is preferable in that air bubbles tend not to remain in the sealing material 31 formed integrally with the resin 31b. In addition, when vacuum pressing is used, it tends to be advantageous for securing a uniform pressing force between the back electrode type solar cell and the wiring sheet.

  Here, as the transparent substrate 30, any substrate that is transparent to sunlight can be used without particular limitation, and for example, a glass substrate or the like can be used.

  Further, as the first transparent resin 31a and the second transparent resin 31b, a resin transparent to sunlight can be used without any particular limitation, and among them, ethylene vinyl acetate resin, epoxy resin, acrylic resin, urethane It is preferable to use at least one transparent resin selected from the group consisting of resin, olefin resin, polyester resin, silicone resin, polystyrene resin, polycarbonate resin and rubber resin. In this case, since the sealing material 31 is excellent in weather resistance and has high sunlight permeability, the output of the solar cell module (especially, the short-circuit current or the current during operation) is sufficiently strong without significantly impairing. It can be fixed to the transparent substrate 30. Thereby, it exists in the tendency which can ensure the long-term reliability of a solar cell module.

  The first transparent resin 31a and the second transparent resin 31b may be the same type of transparent resin or different types of transparent resin.

  Moreover, the heat treatment at the time of sealing the solar cell with the wiring sheet in the sealing material 31 is, for example, when the first transparent resin 31a and the second transparent resin 31b are each made of ethylene vinyl acetate resin. For example, the first transparent resin 31a and the second transparent resin 31b can be heated to a temperature of 100 ° C. or higher and 200 ° C. or lower, respectively.

  Moreover, as the back surface protection sheet 32, any material that can protect the back surface of the sealing material 31 can be used without any particular limitation. For example, a weathering film such as PET that has been conventionally used can be used. it can.

  Further, from the viewpoint of sufficiently suppressing permeation of water vapor and oxygen into the sealing material 31 and ensuring long-term reliability, the back surface protection sheet 32 may include a metal film such as aluminum.

  Moreover, it is also possible to completely adhere the back surface protection sheet 32 such as the end face of the solar cell module to a part that is difficult to adhere by using a moisture permeation prevention tape such as a butyl rubber tape.

  FIG. 6A and FIG. 6B are schematic cross-sectional views illustrating another example of the manufacturing method of the example of the solar cell module of the present invention. Hereinafter, with reference to FIG. 6A and FIG. 6B, another example of the manufacturing method of the example of the solar cell module of the present invention will be described. In the following, as an example of the solar cell module of the present invention, a solar cell having a configuration in which the solar cell with a wiring sheet having the configuration shown in FIGS. 3A and 3B is sealed in a sealing material. Although a module is demonstrated, it cannot be overemphasized that the structure of the solar cell module of this invention is not limited to this structure.

  First, as shown to Fig.6 (a), while installing only the back surface protection sheet 32 in the wiring sheet side of the photovoltaic cell with a wiring sheet, it is 1st in the back electrode type photovoltaic cell side of the photovoltaic cell with a wiring sheet. The transparent substrate 30 provided with the transparent resin 31a is installed.

  Next, as shown in FIG. 6B, the first transparent resin 31a is heat-treated in a state where the first transparent resin 31a is pressure-bonded to the back surface electrode type solar cell of the solar cell with wiring sheet. The solar cell with wiring sheet is wrapped in 31a and sealed. Thereby, an example of the solar cell module of the present invention in which the solar cell with the wiring sheet is sealed in the first transparent resin 31a is produced.

  Also in the solar cell module having the configuration shown in FIG. 6B, the back electrode type solar cells are strongly pressed against the wiring sheet by the shrinkage force of the cured first transparent resin 31a, and the first of the back electrode type solar cells is obtained. The crimping of the conductive type electrode 14 and the first conductive type wiring 22 of the wiring sheet and the crimping of the second conductive type electrode 15 of the back electrode type solar cell and the second conductive type wiring 23 of the wiring sheet are respectively performed. By strengthening, good electrical connection can be obtained between the electrode of the back electrode type solar cell and the wiring of the wiring sheet.

  In an example of the solar cell module of the present invention produced as described above, the current generated when light enters the light receiving surface of the back electrode type solar cell is the first conductivity type of the back electrode type solar cell. The first conductive type wiring 22 and the second conductive type wiring 23 of the wiring sheet are taken out from the working electrode 14 and the second conductive type electrode 15, respectively. And the electric current taken out by the wiring 22 for 1st conductivity type and the wiring 23 for 2nd conductivity type of a wiring sheet is electrically connected to the termination | terminus of the wiring material of a wiring sheet, as shown to Fig.1 (a). Then, it is taken out from the terminal through the back protective sheet 32.

  Moreover, in an example of the solar cell module of the present invention manufactured as described above, a frame made of, for example, an aluminum alloy may be attached so as to surround the outer periphery of the solar cell module.

<Other forms>
In FIG. 7, the typical top view of the back surface of the other example of the back electrode type photovoltaic cell of this invention is shown. Here, as shown in FIG. 7, the back electrode type solar cell 10 of the present invention has a plurality of dot-shaped first conductivity type electrodes 14 on the back surface of a semiconductor substrate 11 having n-type or p-type conductivity. A row of first conductivity type electrodes 14 arranged in a straight line and a row of second conductivity type electrodes 15 in which a plurality of dot-like second conductivity type electrodes 15 are arranged in a straight line. They are arranged alternately. Then, from the left side to the right side of the semiconductor substrate 11 in FIG. 7, the arrangement starts from the column of the first conductivity type electrodes 14, and the arrangement ends at the column of the first conductivity type electrodes 14. That is, the number of the first conductivity type electrodes 14 is one more than the number of the second conductivity type electrodes 15.

  Therefore, when only the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface of the back electrode type solar battery cell 10 of the present invention shown in FIG. The pattern (an arrangement pattern including only the first conductivity type electrode 14 and the second conductivity type electrode 15 when it is assumed that the semiconductor substrate 11 does not exist in FIG. 7) has rotational symmetry. That is, this electrode pattern overlaps the original electrode pattern when rotated 180 °.

  The electrodes located on both sides of the electrode pattern (both ends in the left-right direction in FIG. 7 which is the arrangement direction of the first conductive type electrode 14 column and the second conductive type electrode 15 column) are the first conductive type. This is a row of electrodes 14 for use.

  Therefore, also in the back electrode type solar cell 10 having the configuration shown in FIG. 7, even when the back electrode type solar cell 10 is rotated 180 °, as shown in the schematic plan view of FIG. The electrode pattern composed of the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface of the solar battery cell 10 is the same as before the rotation.

  Therefore, also in the back electrode type solar cell 10 having the configuration shown in FIG. 7, the arrangement of the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface on the light receiving surface of the back electrode type solar cell 10 is shown. Even when nothing is formed as a guide, when the back electrode type solar cell 10 is installed on the wiring sheet 20, the first conductivity type electrode 14 of the back electrode type solar cell 10 is connected to the wiring sheet. 20 is electrically connected to the second conductivity type wiring 23, and the second conductivity type electrode 15 of the back electrode type solar cell 10 is electrically connected to the first conductivity type wiring 22 of the wiring sheet 20. Therefore, the manufacturing efficiency of the solar cell with wiring sheet and the solar cell module can be improved as compared with the conventional case.

  Also in the back electrode type solar cell 10 having the configuration shown in FIG. 7, the first conductivity type electrode 14 and the second conductivity on the back surface of the back electrode type solar cell 10 are formed on the light receiving surface of the back electrode type solar cell 10. It is also possible to reduce the necessity of forming a mark or the like that serves as a guide indicating the arrangement of the mold electrode 15.

  In FIG. 9, the typical top view of the back surface of further another example of the back surface electrode type photovoltaic cell of this invention is shown. Here, as shown in FIG. 9, the back electrode type solar cell 10 of the present invention has a plurality of dot-shaped first conductivity type electrodes 14 on the back surface of a semiconductor substrate 11 having n-type or p-type conductivity. A row of first conductivity type electrodes 14 arranged in a straight line and a row of second conductivity type electrodes 15 in which a plurality of dot-like second conductivity type electrodes 15 are arranged in a straight line. They are arranged alternately. Then, from the left side to the right side of the semiconductor substrate 11 in FIG. 9, the arrangement starts from the column of the first conductivity type electrodes 14 and the arrangement ends at the column of the first conductivity type electrodes 14. That is, the number of the first conductivity type electrodes 14 is one more than the number of the second conductivity type electrodes 15.

  Furthermore, in the back electrode type solar cell 10 shown in FIG. 9, the dot-shaped second conductivity type electrode 15 is located between the adjacent dot-shaped first conductivity type electrodes 14, and the adjacent dots In this configuration, the first conductivity type electrode 14 is positioned between the second conductivity type electrodes 15.

  Therefore, when only the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface of the back electrode type solar cell 10 of the present invention shown in FIG. The pattern (an arrangement pattern including only the first conductivity type electrode 14 and the second conductivity type electrode 15 when it is assumed that the semiconductor substrate 11 does not exist in FIG. 9) has rotational symmetry. That is, when this electrode pattern is rotated 90 ° or 180 °, it overlaps the original electrode pattern.

  The electrodes located on both sides of the electrode pattern (both ends in the left-right direction in FIG. 9 which is the arrangement direction of the first conductive type electrode 14 row and the second conductive type electrode 15 row) are the first conductive type. This is a row of electrodes 14 for use.

  Therefore, in the back electrode type solar cell 10 having the configuration shown in FIG. 9, as shown in the schematic plan view of FIG. 10, the back electrode type solar cell 10 is rotated by 90 ° and 180 °. In any case, the electrode pattern composed of the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface of the back electrode type solar cell 10 is the same as before the rotation.

  Therefore, in the back electrode type solar cell 10 having the configuration shown in FIG. 9, the arrangement of the first conductivity type electrode 14 and the second conductivity type electrode 15 on the back surface on the light receiving surface of the back electrode type solar cell 10 is shown. Even when nothing is formed as a guide, when the back electrode type solar cell 10 is installed on the wiring sheet 20, the first conductivity type electrode 14 of the back electrode type solar cell 10 is connected to the wiring sheet. 20 is electrically connected to the second conductivity type wiring 23, and the second conductivity type electrode 15 of the back electrode type solar cell 10 is electrically connected to the first conductivity type wiring 22 of the wiring sheet 20. Therefore, the production efficiency of the solar battery cell with a wiring sheet and the solar battery module can be greatly improved as compared with the conventional case.

  Also in the back electrode type solar cell 10 having the configuration shown in FIG. 9, the first conductivity type electrode 14 and the second conductivity on the back surface of the back electrode type solar cell 10 are formed on the light receiving surface of the back electrode type solar cell 10. It is also possible to reduce the necessity of forming a mark or the like that serves as a guide indicating the arrangement of the mold electrode 15.

  The schematic diagram illustrating the manufacturing process of the other example of the photovoltaic cell with a wiring sheet of this invention to Fig.11 (a)-FIG.11 (d) is shown.

  First, as shown in the schematic plan view of FIG. 11A, a wiring sheet 20 for one back electrode type solar cell is prepared. Here, the wiring sheet 20 having the configuration shown in FIG. 11A includes an insulating base 21, a strip-shaped first conductivity type wiring 22 patterned on the surface of the insulating base 21, and a strip-shaped first wiring 22. And a two-conductivity type wiring 23.

  Moreover, the strip-shaped first conductivity type wiring 22 and the strip-shaped second conductivity type wiring 23 are the strip-shaped first conductivity type wiring 22 extending in the vertical direction of FIG. 11A and the strip-shaped second conductivity type. 11 are arranged in the left-right direction in FIG. 11A alternately with a predetermined interval from each other, and these wiring members are arranged in the first direction from the left side to the right side in FIG. The arrangement starts from the conductive type wiring 22, and the arrangement ends at the first conductive type wiring 22.

  Therefore, only the first conductivity type wiring 22 and the second conductivity type wiring 23 on the surface of the insulating base material 21 of the wiring sheet 20 of the present invention shown in FIG. When the connection wiring pattern is used, the first conductive type wiring 22 and the second wiring when assuming that the insulating base material 21 and the connection wiring 24 do not exist in FIG. The arrangement pattern consisting only of the conductive type wiring 23) has rotational symmetry. That is, this solar cell connection wiring pattern overlaps the original solar cell connection wiring pattern when rotated 180 °. For example, in the solar cell connection wiring pattern shown in FIG. 11A, the portions of the wirings 22 and 23 having the same length in the longitudinal direction overlap when rotated by 180 °.

  And the wiring material located on both sides of the solar cell connection wiring pattern (both ends in the left-right direction in FIG. 11A, which is the arrangement direction of the first conductivity type wiring 22 and the second conductivity type wiring 23), This is a strip-shaped first conductivity type wiring 22 connected to the same conductivity type electrode (in this example, the first conductivity type electrode 14) of the back electrode type solar cell 10.

  Next, as shown in the schematic perspective view of FIG. 11B, the back electrode type solar cell 10 is moved above the surface of the wiring sheet 20 on which the wiring material is formed. Then, the back surface side of the back electrode type solar cell 10 faces the installation side of the wiring material of the wiring sheet 20, and the first conductivity type electrode 14 of the back electrode type solar cell 10 is the first of the wiring sheet 20. The back electrode is electrically connected to the conductive type wiring 22 and the second conductive type electrode 15 of the back electrode type solar cell 10 is electrically connected to the second conductive type wiring 23 of the wiring sheet 20. The position of the solar cell 10 is adjusted.

  Next, as shown in the schematic perspective view of FIG. 11C, the back electrode type solar cell 10 is installed on the wiring sheet 20, and the first conductivity type electrode on the back surface of the back electrode type solar cell 10. 14 and the first conductivity type wiring 22 of the wiring sheet 20, and the second conductivity type electrode 15 on the back surface of the back electrode type solar cell 10 and the second conductivity type wiring 23 of the wiring sheet 20 are joined together. By joining, another example of the solar cell with a wiring sheet of the present invention is produced.

  That is, as shown in FIG. 11 (d), the first conductivity type electrode 14 on the back surface of the back electrode type solar cell 10 is provided on the surface of the insulating substrate 21 of the wiring sheet 20. The second conductive type electrode 15 on the back surface of the back electrode type solar battery cell 10 is joined to the wiring for wiring 22 and the second conductive type wiring 23 installed on the surface of the insulating substrate 21 of the wiring sheet 20. Joined with. Accordingly, the first conductivity type electrode 14 of the back electrode type solar cell 10 is electrically connected to the first conductivity type wire 22 of the wiring sheet 20, and the second conductivity type of the back electrode type solar cell 10. The electrode 15 is electrically connected to the second conductivity type wiring 23 of the wiring sheet 20.

  In addition, the joining method of the 1st conductivity type electrode 14 of the back electrode type solar cell 10 and the 1st conductivity type wiring 22 of the wiring sheet 20, and the 2nd conductivity type electrode 15 of the back electrode type solar cell 10 and The method for joining the wiring sheet 20 to the second conductivity type wiring 23 is not particularly limited, and a method similar to the method described as the method used for manufacturing the solar cell with the wiring sheet can be used.

  In the solar cell with the wiring sheet having the above-described configuration, the current generated when light is incident on the light receiving surface of the back electrode type solar cell 10 is the first conductivity type electrode 14 of the back electrode type solar cell 10 and the first current. The two conductive type electrodes 15 are taken out to the outside through the first conductive type wirings 22 and the second conductive type wirings 23 of the wiring sheet 20, respectively.

  Moreover, the photovoltaic cell with a wiring sheet having the above-described configuration may be sealed in the sealing material as in the solar cell module.

  Since an example of the solar cell with a wiring sheet having the above-described configuration can be reduced in size, it can be used for, for example, a power source of a mobile phone.

  11C and 11D are exposed to the outside of one solar cell with a wiring sheet, for example, as shown in the schematic plan view of FIG. By electrically connecting the first conductive type wiring 22 and the second conductive type wiring 23 exposed to the outside of the solar cell with the other wiring sheet by the conductive connecting member 40 Another example of the solar cell string (solar cell with a wiring sheet or solar cell module) of the present invention can be formed.

  Moreover, as shown in the schematic plan views of FIGS. 17A to 17D, all the electrodes of the back electrode type solar cell 10 do not have to have the rotational symmetry described above. Any pattern that does not significantly impair the output of the battery module may be used.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention may be applicable to solar cells, wiring sheets, solar cells with wiring sheets, solar cell strings, and solar cell modules.

  10, 100 Back electrode type solar cell, 11 Semiconductor substrate, 12 First conductivity type impurity diffusion region, 13 Second conductivity type impurity diffusion region, 14 First conductivity type electrode, 15 Second conductivity type electrode, 16 Passivation Film, 17 Antireflection film, 18 Texture structure, 20, 200 Wiring sheet, 21 Insulating substrate, 22 First conductive type wiring, 23 Second conductive type wiring, 24 Connecting wiring, 30 Transparent substrate, 31 Seal Stop material, 31a 1st transparent resin, 31b 2nd transparent resin, 32 back surface protection sheet, 40 connection member.

Claims (6)

A semiconductor substrate;
A first conductivity type impurity diffusion region formed on one surface side of the semiconductor substrate;
A second conductivity type impurity diffusion region formed on the one surface side of the semiconductor substrate;
A first conductivity type electrode electrically connected to the first conductivity type impurity diffusion region;
A second conductivity type electrode electrically connected to the second conductivity type impurity diffusion region,
An electrode pattern composed of the first conductivity type electrode and the second conductivity type electrode has rotational symmetry,
A solar battery cell in which electrodes located on both sides of the electrode pattern are electrically connected to impurity diffusion regions of the same conductivity type. A first conductivity type electrode electrically connected to the first conductivity type impurity diffusion region of the semiconductor substrate and a second conductivity type electrode electrically connected to the second conductivity type impurity diffusion region of the semiconductor substrate. It is a wiring sheet for installing the provided solar battery cell,
An insulating substrate;
And a wiring material installed on one surface side of the insulating base material,
The wiring material includes a first conductivity type wiring for electrical connection to the first conductivity type electrode, and a second conductivity type wiring for electrical connection to the second conductivity type electrode. Including
The photovoltaic cell connection wiring pattern composed of the first conductive type wiring and the second conductive type wiring has rotational symmetry,
A wiring sheet in which wiring materials located on both sides of the solar cell connection wiring pattern are connected to electrodes of the same conductivity type of the solar cells. The solar battery cell according to claim 1;
A wiring sheet according to claim 2,
The first conductive type wiring of the wiring sheet and the first conductive type electrode of the solar battery cell are electrically connected;
A solar cell with a wiring sheet, wherein the second conductive type wiring of the wiring sheet and the second conductive type electrode of the solar cell are electrically connected. The wiring sheet according to claim 2, wherein the semiconductor sheet, the first conductivity type impurity diffusion region and the second conductivity type impurity diffusion region formed in the semiconductor substrate, and the first conductivity type impurity diffusion region are electrically connected to the wiring sheet. A solar cell with a wiring sheet in which a solar cell comprising a connected first conductivity type electrode and a second conductivity type electrode electrically connected to the second conductivity type impurity diffusion region is installed. There,
The first conductive type wiring of the wiring sheet and the first conductive type electrode of the solar battery cell are electrically connected;
A solar cell with a wiring sheet, wherein the second conductive type wiring of the wiring sheet and the second conductive type electrode of the solar cell are electrically connected.   The photovoltaic cell with a wiring sheet formed by electrically connecting the photovoltaic cells with a wiring sheet according to claim 3 or 4.   A solar cell module in which the solar cell with a wiring sheet according to any one of claims 3 to 5 is sealed with a sealing material.

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