JP2017147472A - Solar battery cell and solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery cell and a solar battery module that have an improved photoelectric conversion efficiency.SOLUTION: A solar battery cell 10 includes end portions 20a2 and 20a3 provided with chamfered corner portions, a central portion located to be nearer to the center than the chamfered corner portions in a first direction, and a transparent conductive film 25a covering a portion excluding an edge portion, and further includes plural linear electrode portions 31 extending in a second direction, plural trapezoidal electrode portions 32a and 32b each having a pair of oblique side portions for connecting the end portions of the upper and lower bottom portions extending in the second direction, and a bus bar portion 33. The pair of oblique side portions are not directly connected to the bus bar portion 33, but the transparent conductive film 25a is provided outside the pair of oblique side portions. The distance between the edge side of the transparent conductive film 25a along the pair of oblique side portions and the pair of oblique side portions is not more than the maximum distance at which carriers must move in an area sandwiched between the plural electrode portions of the trapezoidal electrode portions until the carriers are collected by the plural electrode portions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solar battery cell and a solar battery module.

  In recent years, solar cells have attracted a great deal of attention as an energy source with a low environmental load. The solar battery cell has a photoelectric conversion unit that generates carriers such as electrons and holes by receiving light, and an electrode that collects the carriers generated in the photoelectric conversion unit. As an electrode for collecting the carriers, for example, as described in Patent Document 1 below, the electrode extends along one direction on the main surface of the photoelectric conversion unit and is perpendicular to the one direction. An electrode including a plurality of linear finger electrode portions arranged along other directions and a bus bar portion electrically connecting the plurality of finger electrodes is widely used.

JP 2010-186862 A

  In recent years, there has been an increasing demand for further improving the photoelectric conversion efficiency of solar cells.

  This invention is made | formed in view of this point, The objective is to provide the photovoltaic cell and solar cell module which have the improved photoelectric conversion efficiency.

  A solar battery cell according to the present invention is a solar battery cell having a rectangular photoelectric conversion part whose corners are chamfered and an electrode disposed on one main surface of the photoelectric conversion part, The one main surface includes an end portion where the chamfered corner portion is provided in a first direction, a central portion located on the center side of the chamfered corner portion in the first direction, A planar transparent conductive film provided so as to cover a portion excluding an edge portion of the one main surface between the one main surface and the electrode, and the electrode is disposed at the central portion A plurality of linear electrode portions extending along a second direction perpendicular to the first direction; and an upper portion provided at the end portion and extending along the second direction. Connecting the bottom and lower bottom, the end of the upper bottom and the end of the lower bottom, A plurality of trapezoidal electrode portions including a pair of oblique sides extending along the side, a wiring member electrically connecting the plurality of solar cells provided along the first direction, and at least the end portion And a plurality of linear electrode portions, at least one bus bar portion directly connected to the upper bottom portion and the lower bottom portion, and the pair of oblique sides are directly connected to the bus bar portion. In the end portion, the transparent conductive film is formed along the end side of the chamfered corner portion and provided outside the pair of oblique sides, and The distance between the edge of the transparent conductive film along the pair of oblique sides and the pair of oblique sides is that of the trapezoidal electrode portion that extends along the second direction including the upper and lower bases. In the area sandwiched between multiple electrode parts, A is the maximum distance below must travel before being collected by the plurality of electrode portions.

  The solar cell module according to the present invention includes a plurality of solar cells according to the present invention and a wiring material. The wiring material electrically connects a plurality of solar cells. The wiring material is arranged so as to intersect with the plurality of linear electrode portions.

ADVANTAGE OF THE INVENTION According to this invention, the photovoltaic cell and solar cell module which have the improved photoelectric conversion efficiency can be provided.

It is a schematic plan view of the light receiving surface of the solar battery cell according to the first embodiment. It is a schematic plan view of the back surface of the solar battery cell in the first embodiment. FIG. 3 is a schematic cross-sectional view of the portion indicated by line III-III in FIG. 1. It is the typical enlarged plan view which expanded a part of light-receiving surface of the photovoltaic cell in the 1st comparative example. It is the typical enlarged plan view which expanded a part of light-receiving surface of the photovoltaic cell in a 1st embodiment. It is a schematic plan view of a light receiving surface of a solar battery cell according to a first modification. It is a schematic plan view of a light receiving surface of a solar battery cell according to a second modification. It is a schematic plan view of a light receiving surface of a solar battery cell according to a second embodiment. It is the typical enlarged plan view which expanded a part of light-receiving surface of the photovoltaic cell in the 2nd comparative example. It is the typical enlarged plan view which expanded a part of light-receiving surface of the photovoltaic cell in 2nd Embodiment. It is a schematic plan view of a light receiving surface of a solar battery cell according to a third modification. It is schematic-drawing sectional drawing of the solar cell module which concerns on 3rd Embodiment.

  Hereinafter, an example of the preferable form which implemented this invention is demonstrated. However, the following embodiments are merely examples. The present invention is not limited to the following embodiments.

  Moreover, in each drawing referred in embodiment etc., the member which has a substantially the same function shall be referred with the same code | symbol. The drawings referred to in the embodiments and the like are schematically described, and the ratio of the dimensions of the objects drawn in the drawings may be different from the ratio of the dimensions of the actual objects. The dimensional ratio of the object may be different between the drawings. The specific dimensional ratio of the object should be determined in consideration of the following description.

(First embodiment)
FIG. 1 is a schematic plan view of a light receiving surface of the solar battery cell according to the first embodiment. FIG. 2 is a schematic plan view of the back surface of the solar battery cell in the first embodiment. 3 is a schematic cross-sectional view of the portion indicated by line III-III in FIG.

  First, the configuration of the solar battery cell 10 according to the present embodiment will be described with reference to FIGS. The solar battery cell 10 has a photoelectric conversion unit 20. The photoelectric conversion unit 20 is a member that generates carriers such as electrons and holes by receiving light. For example, the photoelectric conversion unit 20 may include a crystalline semiconductor substrate having one conductivity type, and may have a semiconductor junction such as a pn junction or a pin junction. In addition, the photoelectric conversion unit 20 is disposed on one main surface of the crystalline semiconductor substrate having one conductivity type, and the first amorphous semiconductor layer having another conductivity type. And a second amorphous semiconductor layer having one conductivity type, which is disposed on the other main surface of the crystalline semiconductor substrate. Further, the photoelectric conversion unit 20 may have a semiconductor substrate in which an n-type dopant diffusion region and a p-type dopant diffusion region are exposed on the surface.

  The photoelectric conversion unit 20 has a rectangular shape in which each of the four corners is chamfered. The photoelectric conversion unit 20 has chamfered corners 20A to 20D. That is, each of the light receiving surface 20a and the back surface 20b of the photoelectric conversion unit 20 has a rectangular shape in which each of the four corners is chamfered.

  The light receiving surface 20a includes, in the x direction, a first end 20a2 provided with chamfered corners 20A and 20B, a second end 20a3 provided with chamfered corners 20C and 20D, and a chamfer. The center part 20a1 located in the center side rather than shape-like corner part 20A-20D is included. Similarly, the back surface 20b also includes first and second end portions and a central portion.

  A planar transparent conductive oxide (TCO) 25a is provided on the light receiving surface 20a. The portion of the light receiving surface 20a excluding the edge is covered with the transparent conductive film 25a. Similarly, a planar transparent conductive film 25b is provided on the back surface 20b. The portion excluding the edge portion of the back surface 20b is covered with the transparent conductive film 25b. These transparent conductive films 25a and 25b have a function of assisting current collection by the following electrodes 21a and 21b. By providing the transparent conductive films 25a and 25b, the generated carriers are efficiently collected by the electrodes 21a and 21b before being recombined. Therefore, more improved photoelectric conversion efficiency can be realized.

  The transparent conductive films 25a and 25b can be formed of, for example, ITO (Indium Tin Oxide). The thickness of the transparent conductive films 25a and 25b can be set to, for example, 50 to 150 nm.

  An electrode 21a is disposed on the light receiving surface 20a. Specifically, the electrode 21a is disposed on a transparent conductive film 25a provided on the light receiving surface 20a. On the other hand, the electrode 21b is disposed on the back surface 20b. Specifically, the electrode 21b is disposed on a transparent conductive film 25b provided on the back surface 20b.

  The material of the electrodes 21a and 21b is not particularly limited as long as it is a conductive material. Each of the electrodes 21a and 21b can be made of, for example, a metal such as silver, copper, aluminum, titanium, nickel, or chromium, or an alloy containing one or more of these metals. In addition, the electrodes 21a and 21b may be configured by, for example, a stacked body of a plurality of conductive layers made of the above metals or alloys.

  The formation method of the electrodes 21a and 21b is not particularly limited. The electrodes 21a and 21b can be formed using a conductive paste such as an Ag paste, for example. The electrodes 21a and 21b can be formed using, for example, a sputtering method, a vapor deposition method, a screen printing method, a plating method, or the like.

  In the present embodiment, the electrode 21b has a configuration substantially similar to that of the electrode 21b. Therefore, here, the configuration of the electrode 21a will be described in detail. For the electrode 21b, the description relating to the electrode 21a is cited.

  The electrode 21 a includes a plurality of linear electrode portions 31, trapezoidal electrode portions 32 a and 32 b, and a plurality of bus bar portions 33. Each of the plurality of linear electrode portions 31 is disposed in the central portion 20a1. Each of the plurality of linear electrode portions 31 extends along the x direction perpendicular to the y direction. The plurality of linear electrode portions 31 are arranged along the y direction. The plurality of linear electrode portions 31 are parallel to each other.

  The trapezoidal electrode portion 32a is disposed on the first end 20a2. The trapezoidal electrode portion 32a includes an upper bottom portion 32a1, a lower bottom portion 32a2, and a pair of oblique sides 32a3 and 32a4. Each of the upper bottom portion 32a1 and the lower bottom portion 32a2 extends along the x direction. The upper bottom part 32a1 is located relatively outside in the y direction, and the lower bottom part 32a2 is located relatively inside in the y direction. The upper bottom portion 32a1 is shorter than the lower bottom portion 32a2. Each of the pair of oblique sides 32a3 and 32a4 connects the end portion of the upper bottom portion 32a1 and the end portion of the lower bottom portion 32a2. The pair of oblique sides 32a3 and 32a4 extend along the end sides of the chamfered corners 20A and 20B. That is, the oblique sides 32a3 and 32a4 extend in directions inclined with respect to the x direction and the y direction, respectively. In the present embodiment, the angle formed by the oblique sides 32a3 and 32a4 and each of the x direction and the y direction is about 45 °.

  The trapezoidal electrode portion 32a further includes a linear electrode portion 32a5. The linear electrode portion 32a5 is located between the upper bottom portion 32a1 and the lower bottom portion 32a2 in the y direction. The linear electrode portion 32a5 extends along the x direction. The linear electrode portion 32a5 connects the middle portions of the pair of oblique sides 32a3 and 32a4.

  The trapezoidal electrode portion 32b is disposed on the second end portion 20a3. The trapezoidal electrode portion 32b includes an upper bottom portion 32b1, a lower bottom portion 32b2, and a pair of oblique sides 32b3 and 32b4. Each of the upper bottom portion 32b1 and the lower bottom portion 32b2 extends along the x direction. The upper bottom part 32b1 is located relatively outside in the y direction, and the lower bottom part 32b2 is located relatively inside in the y direction. The upper bottom portion 32b1 is shorter than the lower bottom portion 32b2. Each of the pair of oblique sides 32b3 and 32b4 connects the end portion of the upper bottom portion 32b1 and the end portion of the lower bottom portion 32b2. The pair of oblique sides 32b3 and 32ba4 extend along the edges of the chamfered corners 20C and 20D. That is, the oblique sides 32b3 and 32b4 extend in directions inclined with respect to the x direction and the y direction, respectively. In the present embodiment, the angle formed by the oblique sides 32b3 and 32b4 and each of the x direction and the y direction is about 45 °.

  The trapezoidal electrode portion 32b further includes a linear electrode portion 32b5. The linear electrode portion 32b5 is located between the upper bottom portion 32b1 and the lower bottom portion 32b2 in the y direction. The linear electrode portion 32b5 extends along the x direction. The linear electrode portion 32b5 connects the middle portions of the pair of oblique sides 32b3 and 32b4.

  In the present invention, the “trapezoid” includes a rectangle.

  The widths of the linear electrode portions 31, 32a5, 32b5, the upper bottom portions 32a1, 32b1, the lower bottom portions 32a2, 32b2, and the hypotenuse portions 32a3, 32a4, 32b3.32b4 are not particularly limited. can do. The widths of the linear electrode portions 31, 32a5, 32b5, the upper bottom portions 32a1, 32b1, and the lower bottom portions 32a2, 32b2 may be different from each other or the same. Although the space | interval of the linear electrode part 31 adjacent in ay direction is not specifically limited, For example, it can be 1-3 mm degree.

  The plurality of bus bar portions 33 extend along the y direction. The plurality of bus bar portions 33 are arranged along the x direction. Each of the plurality of bus bar portions 33 is electrically connected to the plurality of linear electrode portions 31, the upper bottom portions 32a1, 32b1, the lower bottom portions 32a2, 32b2, and the linear electrode portions 32a5, 32b5.

  In the present embodiment, the example in which the electrode 21 a includes the two bus bar portions 33 has been described. However, the present invention is not limited to this configuration. In the present invention, the electrode may not include the bus bar portion, or may include one or three or more bus bar portions. Although the width | variety of the bus-bar part 33 is not specifically limited, For example, it can be set as about 0.5-2 mm.

  Moreover, in this embodiment, the bus-bar part 33 is linear, However, In this invention, a bus-bar part does not need to be linear. The bus bar portion may be provided in a zigzag shape, for example.

  By the way, for example, it is also conceivable to form a plurality of linear electrode portions on the first and second end portions without providing the trapezoidal electrode portion. That is, it is conceivable that the electrode is composed of only a plurality of linear electrode portions or a plurality of linear electrode portions and bus bar portions. However, in that case, the current collecting resistance at the chamfered corner portion of the photoelectric conversion efficiency is increased. Accordingly, the photoelectric conversion efficiency is lowered. Hereinafter, this reason will be described with reference to FIG.

  For example, when the trapezoidal electrode portion is not provided at the end portion and a plurality of linear electrode portions 131 are provided, the light receiving surface 120a is close to the linear electrode portion 131 in the y direction. The distance that the carrier 100 generated in the non-proximity region 120a21 that has not been moved must move before being collected by the linear electrode portion 131 is long. For this reason, the current collection resistance in the non-proximity region 120a21 increases. As a result, the photoelectric conversion efficiency is lowered.

  In contrast, in the present embodiment, trapezoidal electrode portions 32a and 32b are provided at the end portions 20a2 and 20a3. The trapezoidal electrode portions 32a and 32b include oblique sides 32a3, 32a4, 32b3 and 32b4. The oblique sides 32a3, 32a4, 32b3, and 32b4 extend along the end sides of the chamfered corners 20A to 20D. Therefore, as shown in FIG. 5, the carrier 35 generated in the region 20a21 is collected by the oblique sides 32a3, 32a4, 32b3, and 32b4. For this reason, the distance that the carrier 35 has to move before being collected by the electrode 21a is short. Therefore, the current collecting resistance in the region 20a21 can be reduced. Therefore, the photoelectric conversion efficiency can be improved.

  In the present embodiment, linear electrode portions 32a5 and 32b5 are provided inside the trapezoidal electrode portions 32a and 32b. For this reason, the current collection resistance in the edge parts 20a2 and 20a3 provided with the trapezoidal electrode parts 32a and 32b is more efficiently reduced. Therefore, more improved photoelectric conversion efficiency can be realized.

  Specifically, the solar cell 10 of this embodiment and a solar cell having substantially the same configuration as that of the solar cell 10 except that the oblique side portion is not provided were created, and the photoelectric conversion efficiency was measured. As a result, it was confirmed that the solar cell 10 having the oblique sides 32a3, 32a4, 32b3, and 32b4 has about 1% higher photoelectric conversion efficiency than the solar cell not provided with the oblique sides.

  Hereinafter, other examples and modifications of the preferred embodiments in which the present invention is implemented will be described. In the following description, members having substantially the same functions as those of the first embodiment are referred to by the same reference numerals, and description thereof is omitted.

(First modification)
FIG. 6 is a schematic plan view of a light receiving surface of a solar cell according to a first modification.

  In the first embodiment, the example in which each of the electrodes 21a and 21b has one or more bus bar portions has been described. However, the present invention is not limited to this configuration. For example, as illustrated in FIG. 6, the electrode 21 a may not include the bus bar portion 33.

(Second modification)
FIG. 7 is a schematic plan view of a light receiving surface of a solar battery cell according to a second modification.

  In the first embodiment, the example in which the trapezoidal electrode portions 32a and 32b are respectively provided on the first and second end portions 20a2 and 20a3 has been described. However, the present invention is not limited to this configuration. For example, as shown in FIG. 7, a plurality of trapezoidal electrode portions 32a may be arranged along the y direction at the first end 20a2. Similarly, a plurality of trapezoidal electrode portions 32b may be arranged at the second end portion 20a3 along the y direction.

  The trapezoidal electrode portions 32a and 32b may not be provided with the linear electrode portions 32a5 and 32b5, or may be provided with a plurality of linear electrode portions 32a5 and 32b5.

(Second Embodiment)
FIG. 8 is a schematic plan view of the light receiving surface of the solar battery cell according to the second embodiment.

  In the said 1st Embodiment, the whole some linear electrode part 31 is located on the transparent conductive film 25a, and the edge part of the linear electrode part 31 has not reached the edge of the transparent conductive film 25a. An example was described.

  On the other hand, in this embodiment, the edge part of the linear electrode part 31 has reached the edge side of the transparent conductive film 25a. Specifically, the end portion of the linear electrode portion 31 reaches the end side of the photoelectric conversion portion 20. For this reason, more improved photoelectric conversion efficiency can be obtained. Hereinafter, this reason will be described with reference to FIG. 9 and FIG.

  As shown in FIG. 9, when the end portion of the linear electrode portion 31 does not reach the end side of the transparent conductive film 25a, the carriers generated at the end portion 25a1 of the transparent conductive film 25a are collected by the linear electrode portion 31. The distance that must be moved before it is increased. For this reason, the current collection resistance in the edge part 25a1 becomes high. As a result, the photoelectric conversion efficiency tends to decrease.

  On the other hand, as shown in FIG. 10, when the end portion of the linear electrode portion 31 reaches the end side of the transparent conductive film 25 a, carriers generated at the end edge portion 25 a 1 are collected by the linear electrode portion 31. The distance that must be moved before it is reduced. For this reason, the current collection resistance in the edge part 25a1 can be made low. As a result, the photoelectric conversion efficiency can be further improved.

  Specifically, as a result of producing the solar cell of the present embodiment and measuring the photoelectric conversion efficiency, the solar cell of the second embodiment in which the end portion of the linear electrode portion 31 reaches the end side of the transparent conductive film 25a. However, it was confirmed that the photoelectric conversion efficiency was about 1% higher than that of the solar battery cell 10 of the first embodiment in which the end portion of the linear electrode portion 31 did not reach the end side of the transparent conductive film 25a.

(Third Modification)
FIG. 11 is a schematic plan view of a light receiving surface of a solar battery cell according to a third modification. As shown in FIG. 11, the electrode 21a extends along the x direction from the respective ends of the upper bottom portions 32a1, 32b1, the lower bottom portions 32a2, 32b2, and the linear electrode portions 32a5, 32b5, and ends of the transparent conductive film 25a. Further, linear electrode portions 32a6 to 32a11 and 32b6 to 32b11 may be further provided. According to this structure, the current collection resistance in chamfered corner | angular part 20A-20D can be reduced more. As a result, more improved photoelectric conversion efficiency can be obtained.

  In the first embodiment, an example has been described in which both the electrode 21a on the light receiving surface 20a and the electrode 21b on the back surface 20b have trapezoidal electrode portions. However, the present invention is not limited to this configuration. In the present invention, it is only necessary that at least one of the electrode on the light receiving surface and the electrode on the back surface has a trapezoidal electrode portion. Therefore, for example, the electrode on the light receiving surface may include a trapezoidal electrode portion, and the electrode on the back surface may not include a trapezoidal electrode portion. In that case, for example, the electrode on the back surface may be a planar electrode.

  Further, one of the electrode on the light receiving surface and the electrode on the back surface is an electrode having the form shown in FIGS. 1, 6 to 8 or 11, and the other is an electrode having the form shown in FIGS. Of these, an electrode having a different form from the electrode on the light receiving surface may be used. That is, although both the electrode on the light receiving surface and the electrode on the back surface include the trapezoidal electrode portion, the electrode on the light receiving surface and the electrode on the back surface may have different forms.

(Third embodiment)
FIG. 12 is a schematic cross-sectional view of a solar cell module according to the third embodiment.

  The solar battery cell 10 according to the embodiment and the modification can be used as a solar battery module 1 as shown in FIG. The solar cell module 1 of the present embodiment includes a plurality of solar cells 10 arranged along the y direction. The plurality of solar cells 10 are electrically connected by the wiring material 11. Specifically, a plurality of solar cells 10 are electrically connected in series or in parallel by electrically connecting adjacent solar cells 10 with the wiring material 11. Specifically, the wiring member 11 is arranged so as to intersect with the plurality of linear electrode portions 31, the upper bottom portions 32a1, 32b1, and the lower bottom portions 32a2, 32b2, and is electrically connected to these electrode portions. Yes. As shown in FIGS. 1 and 2, when the electrodes 21 a and 21 b include the bus bar portion 33, the wiring member 11 is arranged so as to cover the bus bar portion 33.

  In the present invention, “intersection” includes orthogonality.

  The wiring material 11 and the solar battery cell 10 are bonded by an adhesive. As the adhesive, solder or a resin adhesive can be used. When a resin adhesive is used as the adhesive, the resin adhesive may have an insulating property or an anisotropic conductivity.

  First and second protective members 14 and 15 are arranged on the light receiving surface side and the back surface side of the plurality of solar cells 10. A sealing material 13 is provided between the solar battery cell 10 and the first protective member 14 and between the solar battery cell 10 and the second protective member 15. The plurality of solar cells 10 are sealed with this sealing material 13.

  In addition, the material of the sealing material 13 and the 1st and 2nd protection members 14 and 15 is not specifically limited. The sealing material 13 can be formed of a light-transmitting resin such as ethylene / vinyl acetate copolymer (EVA) or polyvinyl butyral (PVB).

  The first and second protective members 14 and 15 can be formed of glass, resin, or the like, for example. For example, you may comprise one of the 1st and 2nd protection members 14 and 15 by the resin film which interposed metal foil, such as aluminum foil. In this embodiment, the 1st protection member 14 is arrange | positioned at the light-receiving surface side of the photovoltaic cell 10, and consists of glass or translucent resin.

  The 2nd protection member 15 is arrange | positioned at the back surface side of the photovoltaic cell 10, and is comprised by the resin film which interposed metal foil, such as aluminum foil. On the outer periphery of the laminate having the first protective member 14, the sealing material 13, the plurality of solar cells 10, the sealing material 13, and the second protective member 15, if necessary, a metal such as Al A frame (not shown) is attached. Moreover, the terminal box for taking out the output of the solar cell 10 outside is provided in the surface of the 1st protection member 14 as needed.

DESCRIPTION OF SYMBOLS 1 Solar cell module 10 Solar cell 11 Wiring material 13 Sealing material 14 1st protective member 15 2nd protective member 20 Photoelectric conversion part 20A-20D Chamfered corner | angular part 20a Light-receiving surface 20a1 Center part 20a2 1st edge part 20a3 Second end portion 20b Back surface 21a, 21b Electrode 25a, 25b Transparent conductive film 31 Linear electrode portion 32a, 32b Trapezoidal electrode portion 32a1, 32b1 Upper bottom portion 32a2, 32b2 Lower bottom portion 32a3, 32a4, 32b3, 32b4 Slanted side portion 32a5 , 32b5 Linear electrode part 33 Bus bar part

Claims (7)

A rectangular photovoltaic cell having a chamfered corner and an electrode disposed on one main surface of the photoelectric conversion unit,
The one main surface is an end portion where the chamfered corner portion is provided in the first direction, and a central portion located on the center side of the chamfered corner portion in the first direction,
Between the one principal surface and the electrode, a planar transparent conductive film provided so as to cover a portion excluding an edge portion of the one principal surface,
The electrode is
A plurality of linear electrode portions provided in the central portion and extending along a second direction perpendicular to the first direction;
The chamfered corner portion is provided at the end portion and connects the upper and lower bottom portions extending along the second direction, the end portion of the upper bottom portion and the end portion of the lower bottom portion, and the chamfered corner portion. A plurality of trapezoidal electrode portions including a pair of oblique sides extending along the edges of
Connected at least to the wiring member that electrically connects the plurality of solar cells provided along the first direction at the end, and directly with the plurality of linear electrode portions, the upper bottom portion, and the lower bottom portion And at least one bus bar portion connected,
The pair of hypotenuse parts are not directly connected to the bus bar part,
In the end portion, the transparent conductive film is formed along the end side of the chamfered corner portion, and is provided so as to reach the outside of the pair of oblique sides, and further The distance between the edge of the transparent conductive film along the oblique side and the pair of oblique sides is a plurality of electrodes of the trapezoidal electrode part including the upper bottom and the lower bottom and extending along the second direction. Less than or equal to the maximum distance that carriers must travel before being collected by the plurality of electrode portions in the region sandwiched between the portions,
Solar cell. The bus bar portion is provided between two end portions provided with the chamfered corner portion along the first direction, and is covered with a wiring material that electrically connects a plurality of solar cells. And connected with solder or a resin adhesive at an end where at least the chamfered corner is provided on the wiring member,
The solar battery cell according to claim 1. The pair of oblique sides of the trapezoidal electrode portion on the end side among the plurality of trapezoidal electrode portions does not extend from the connection portion with the lower bottom portion to the opposite side of the upper bottom portion,
In the first direction, the pair of oblique sides of the trapezoidal electrode portion on the central side adjacent to the trapezoidal electrode portion on the end portion side extend from the connection portion with the upper bottom portion to the opposite side to the lower bottom portion. Not put out,
The solar cell according to claim 1 or 2. The trapezoidal electrode part further includes a linear electrode part located between the upper bottom part and the lower bottom part in the first direction and connecting the pair of oblique sides,
The solar cell according to claim 1 or 2. The plurality of linear electrode portions are provided so as to reach an end side of the transparent conductive film,
The photovoltaic cell as described in any one of Claims 1-4. The electrode further includes an electrode portion extending from at least one end portion of the upper bottom portion and the lower bottom portion along the second direction and reaching an end side of the transparent conductive film.
The solar cell according to any one of claims 1 to 5. A plurality of solar cells according to any one of claims 1 to 6,
A wiring material electrically connecting the plurality of solar cells, and
The wiring member is arranged so as to intersect with the plurality of linear electrode portions.
Solar cell module.

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