Solar cell module and manufacturing method of the solar cell module

Abstract

To provide a solar cell module capable of easily forming a conductive path and preventing an increase in an electric resistance value, and a manufacturing method of the solar cell module.SOLUTION: A solar cell module 100 includes a conductive layer 2 disposed on a first surface 11 of a substrate 1, a perovskite solar cell element 3 disposed on the conductive layer 2, an electrode 4 disposed on the perovskite solar cell element 3, and a conductive member 5 disposed so as to be electrically connected to the conductive layer 2 at a first edge 1A of the first surface 11 of the substrate 1 and having an adhesive portion 51 and a conductive portion 52. The conductive member 5 continuously covers the first side edge 1A and an outer end edge along the first side edge 1A of the substrate 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a solar cell module and a method for manufacturing a solar cell module. [Background technology]

[0002] BACKGROUND ART Conventionally, when connecting a plurality of solar cell modules or connecting a solar cell module to an external device, it is known to provide a conductive path on the conductive layer of the solar cell module (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a solar cell module in which a bus bar serving as a conductive path is arranged on a conductive layer. The bus bar collects the power generated by the solar cell module. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-222803 Summary of the Invention [Problem to be solved by the invention]

[0005] The busbars described in Patent Document 1 are adhered to the conductive layer with an adhesive or the like, requiring a busbar adhesion process in the manufacture of solar cell modules. Therefore, it was conceived that, instead of using busbars, a conductive member including an adhesive portion with adhesive properties and a conductive portion with electrical conductivity could be disposed on the conductive layer, thereby simplifying the configuration and manufacturing process of the solar cell module. However, the adhesive portion of the conductive member has a linear expansion coefficient that is more than 10 times larger than that of the conductive portion and the conductive layer. Therefore, when a solar cell module is subjected to a thermal cycle, the adhesive portion of the conductive member shrinks significantly, and stress acts from the adhesive portion on the conductive layer and conductive portion, causing the conductive member to peel off from the conductive layer, resulting in an increase in the electrical resistance of the solar cell module.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a solar cell module and a method for manufacturing a solar cell module in which conductive paths can be easily formed and an increase in electrical resistance can be prevented. [Means for solving the problem]

[0007] A solar cell module according to the present invention is characterized in that it comprises a conductive layer disposed on a first surface of a substrate, a perovskite solar cell element disposed on the conductive layer, an electrode disposed on the solar cell element, and a conductive member disposed so as to be electrically connected to the conductive layer at a first edge on the first surface of the substrate, the conductive member having an adhesive adhesive portion and a conductive conductive portion, the conductive member continuously covering the first edge and an outer edge of the substrate along the first edge.

[0008] According to this configuration, the adhesive portion of the conductive member adheres to the first edge of the conductive layer, so that the conductive portion disposed on the conductive layer collects power generated by the perovskite solar cell element, and the conductive member acts as a conductive path. Therefore, the conductive path can be formed more easily than in a configuration in which a bus bar serving as a conductive path is disposed on the conductive layer with an adhesive or the like. Furthermore, because the conductive member continuously covers the first edge and the outer edge along the first edge of the substrate, even if the solar cell module is subjected to a thermal cycle, causing the adhesive portion of the conductive member to shrink and the end of the conductive member to peel off from the conductive layer, contact between the conductive layer and the conductive member is maintained on the outer edge side of the first edge. This suppresses a decrease in the contact area between the conductive layer and the conductive member due to shrinkage of the adhesive portion due to a thermal cycle, and makes it possible to prevent an increase in the electrical resistance of the solar cell module.

[0009] A characteristic configuration of the manufacturing method of the solar cell module according to the present invention includes a first step of forming a solar cell by arranging an electrically conductive layer, a perovskite solar cell element, and an electrode, in this order, on a first surface of a substrate, and a second step of arranging a conductive member having an adhesive adhesive portion and an electrically conductive portion on the substrate or the electrically conductive layer, wherein the second step consists in bonding the adhesive portion to an outer end surface of the substrate, and then bonding the adhesive portion to a first edge on the first surface of the substrate and a second edge on a second surface opposite the first surface.

[0010] According to this configuration, a conductive member having an adhesive adhesive portion and a conductive conductive portion is disposed on a substrate or conductive layer, thereby easily forming a conductive path. Furthermore, by bonding the adhesive portion of the conductive member to the outer edge surface of the substrate and then bonding the adhesive portion to the first and second edges, the conductive member can be disposed along the outer edge surface of the substrate, thereby preventing the formation of voids or the like between the conductive member and the substrate. Therefore, even if the adhesive portion shrinks due to thermal cycling, contact between the conductive layer and the conductive member on the outer edge side of the first edge can be maintained, thereby preventing a decrease in the contact area between the adhesive portion and the conductive layer and preventing an increase in the electrical resistance of the solar cell module. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a solar cell module. [Figure 2] FIG. 1 is a schematic plan view of a solar cell module. [Figure 3] FIG. 4 is an explanatory diagram illustrating the adhesiveness between a conductive layer and a conductive member. [Figure 4] FIG. 4 is an explanatory diagram illustrating the adhesiveness between a conductive layer and a conductive member. [Figure 5] FIG. 2 is an explanatory diagram of a first step in the method for manufacturing a solar cell module. [Figure 6] FIG. 10 is an explanatory diagram of a second step in the method for manufacturing a solar cell module. [Figure 7] FIG. 10 is a schematic diagram showing the configuration of a solar cell module according to another embodiment. [Figure 8] FIG. 10 is a schematic diagram showing the configuration of a solar cell module according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of a solar cell module and a method for manufacturing a solar cell module according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications are possible without departing from the spirit of the present invention.

[0013] [Schematic configuration of solar cell module] 1, the solar cell module 100 has a plurality of solar cells 10 (three in this embodiment) arranged in parallel. Each solar cell 10 is electrically connected in series by a conductive layer 2 and an electrode 4. The solar cell 10 is formed by laminating a substrate 1, a conductive layer 2, a perovskite solar cell element 3, and an electrode 4 in this order.

[0014] 〔substrate〕 The substrate 1 functions as a support for the perovskite solar cell element 3 and the electrode 4. The substrate 1 is a transparent glass substrate, a semi-transparent glass substrate, a transparent resin substrate, or the like, and has insulating properties. As shown in Figure 2, the substrate 1 has a rectangular shape when viewed along the Z direction.

[0015] As shown in FIG. 1, an electrically conductive layer 2 is laminated on a first surface 11 of a substrate 1. The orientation of the solar cell module 100 during use is not particularly limited, but it is preferable that the solar cell module 100 be used so that light is incident on a second surface 12 opposite to the first surface 11 of the substrate 1. Hereinafter, the direction from the substrate 1 to the electrically conductive layer 2 will be referred to as the "Z1 direction" (an example of a lamination direction), the opposite direction will be referred to as the "Z2 direction," and the Z1 direction and the Z2 direction will be collectively referred to as the "Z direction." Furthermore, one of the directions perpendicular to the Z direction will be referred to as the "X direction," and the direction perpendicular to the Z direction and the X direction will be referred to as the "Y direction" (see FIG. 2). Note that FIG. 2 is a view of the solar cell module 100 shown in FIG. 1 as viewed in the Z2 direction.

[0016] [Conductive Layer] The conductive layer 2 is formed on the first surface 11 of the substrate 1 by CVD (chemical vapor deposition), sputtering, or the like. In this embodiment, the conductive layer 2 is formed over the entire first surface 11 of the substrate 1. The conductive layer 2 includes, for example, fluorine-doped tin oxide (FTO), tin oxide (TO), or the like as a material. On the conductive layer 2 (the surface on the Z1 side), a plurality of (three in this embodiment) perovskite solar cell elements 3 are arranged (stacked) in parallel along the X direction.

[0017] [Perovskite solar cell element] The perovskite solar cell element 3 converts light energy into electrical energy. The perovskite solar cell element 3 has an electron transport layer 31, a photoelectric conversion layer 32, and a hole transport layer 33, which are arranged in this order along the Z1 direction. When viewed along the Z direction, the electron transport layer 31, the photoelectric conversion layer 32, and the hole transport layer 33 each have a rectangular shape, and in this embodiment, when viewed along the Z direction, the electron transport layer 31, the photoelectric conversion layer 32, and the hole transport layer 33 each have the same size (area).

[0018] The electron transport layer 31 is disposed on the Z1-side surface of the conductive layer 2. The electron transport layer 31 passes through (transports) electrons received from the photoelectric conversion layer 32 (described later). The electron transport layer 31 includes, as a material, a metal oxide such as titanium oxide, tin oxide, or zinc oxide. In this embodiment, the electron transport layer 31 includes multiple (three in this embodiment) insulating layers 311 extending into multiple (three in this embodiment) recesses 21 formed by removing portions of the conductive layer 2. The insulating layers 311 divide the conductive layer 2, with which each perovskite solar cell element 3 is in contact, into two sections along the X direction. In the electron transport layer 31, electrons can move in the Z direction but have difficulty moving in directions perpendicular to the Z direction (the X and Y directions), restricting their movement between the two sections of the conductive layer 2 corresponding to each perovskite solar cell element 3. The electron transport layer 31 is sometimes referred to as a "blocking layer."

[0019] Since the substrate 1, the conductive layer 2, and the electron transport layer 31 are optically transparent, light such as sunlight and indoor light is guided to the photoelectric conversion layer 32 without being substantially absorbed (or without being absorbed) by the substrate 1, the conductive layer 2, and the electron transport layer 31.

[0020] The photoelectric conversion layer 32 absorbs light energy and converts it into electrical energy. Specifically, the photoelectric conversion layer 32 absorbs light and transfers excited electrons and holes to perform photoelectric conversion. The photoelectric conversion layer 32 includes a perovskite layer made of a perovskite compound. The photoelectric conversion layer 32 further includes a porous oxide semiconductor layer (for example, a porous titanium layer).

[0021] The hole transport layer 33 allows holes received from the photoelectric conversion layer 32 to pass through (transports holes). The hole transport layer 33 contains, for example, an organic compound such as chlorobenzene as a material. An electrode 4 is disposed on the hole transport layer 33 (on the Z1 side).

[0022] The electrode 4 is conductive and functions as a positive electrode. The electrode 4 is electrically connected to the conductive member 5 via the conductive layer 2. As shown in FIG. 1, the electrode 4 is disposed on (a part of) the Z1-side surface of the conductive layer 2, extending in the Z direction from the Z1-side surface of the hole transport layer 33, passing through each side surface of the perovskite solar cell element 3. The electrode 4 includes, for example, graphite, carbon black, carbon nanotubes, carbon nanofibers, carbon fibers, graphene, fullerene, or the like as a material. The electrode 4 may also be formed using a metal such as gold, platinum, silver, or copper, an alloy thereof, or an oxide conductor such as FTO or indium tin oxide (ITO).

[0023] A laminate constituted by one perovskite solar cell element 3 and electrode 4 laminated on the conductive layer 2 of the substrate 1 in this manner is referred to as a solar cell 10. A solar cell module 100 is formed by electrically connecting a plurality of solar cells 10 together.

[0024] Light, such as sunlight, enters the solar cell module 100 through the second surface 12 of the substrate 1. When the light reaches the photoelectric conversion layer 32 via the substrate 1, the conductive layer 2, and the electron transport layer 31, it is absorbed in the photoelectric conversion layer 32, generating electrons and holes. The electrons generated in the photoelectric conversion layer 32 migrate to the conductive layer 2 (negative electrode) via the electron transport layer 31. At the same time, the holes generated in the photoelectric conversion layer 32 migrate to the electrode 4 (positive electrode) electrically connected to the hole transport layer 33. When a load (not shown) is connected between the conductive layer 2 and the electrode 4, the holes combine with the electrons that have traveled through the load. As a result, electricity is generated. Note that electrons moving through the electron transport layer 31 move smoothly along the Z2 direction to reach the conductive layer 2, but as described above, the insulating layer 311 restricts movement in a direction perpendicular to the Z direction. In other words, the solar cell module 100 is configured to prevent short circuits.

[0025] [Conductive member] As shown in FIGS. 1 and 2, a pair of conductive members 5, 5 are arranged on a pair of edges along the Y direction on both sides of the substrate 1 in the X direction. Specifically, the pair of conductive members 5, 5 are arranged on a pair of first edges 1A, 1A on the first surface 11 of the substrate 1 and a pair of second edges 1B, 1B on the second surface 12 of the substrate 1. The first edge 1A and the second edge 1B refer to regions near the sides of the first surface 11 and the second surface 12 of the substrate 1 that are parallel to the Y direction and are further outward in the X direction than the perovskite solar cell element 3 and the electrode 4. In other words, the first edge 1A and the second edge 1B refer to regions on both end sides of the substrate 1 in the X direction. The conductive member 5 continuously covers the first edge 1A, the second edge 1B, and an outer end surface 13 of the outer end surface of the substrate 1 that is along the first edge 1A and the second edge 1B. Therefore, the outer edge of the substrate 1 along the first side edge 1A and the outer edge along the second side edge 1B are covered with the conductive member 5.

[0026] The pair of conductive members 5, 5 are disposed on the conductive layer 2 and are electrically connected to the solar cell 10 while being spaced apart from the perovskite solar cell element 3 and the electrode 4. One of the pair of conductive members 5, 5 (the conductive member 5 on the right side as you face the paper in Figures 1 and 2) is electrically connected to the electrode 4 as the positive electrode via a portion of the conductive layer 2 (the portion to the right of the recess 21 on the right edge as you face the paper in Figure 1). The other conductive member 5 (the conductive member 5 on the left side as you face the paper in Figure 1) is electrically connected to a portion of the conductive layer 2 as the negative electrode (the portion to the left of the recess 21 on the left edge as you face the paper in Figure 1). As a result, the conductive member 5 collects power generated by the perovskite solar cell element 3 and acts as a conductive path.

[0027] The conductive member 5 has an adhesive adhesive portion 51 and a conductive conductive portion 52. The adhesive portion 51 is an adhesive resin containing a conductive material such as a conductive filler, and is adhered to the conductive layer 2 at the first edge 1A and to the substrate 1 at the outer end surface 13 and the second edge 1B. The conductive portion 52 is made of a conductive material such as copper foil or aluminum foil, and is electrically connected to the conductive layer 2 via the adhesive portion 51. In this way, a conductive path is formed by adhering the adhesive portion 51 of the conductive member 5 to the conductive layer 2. Therefore, compared to forming a conductive path by adhering a bus bar to the conductive layer 2 with an adhesive or the like, no adhesive or the like is required, and the conductive path can be easily formed.

[0028] 2, the dimension in the Y direction of the conductive member 5 is approximately the same as the dimension in the Y direction of the substrate 1. The dimension in the X direction of the conductive member 5 covering the second edge 1B is greater than the dimension in the X direction of the conductive member 5 covering the first edge 1A. As a result, when the solar cell module 100 is viewed in the Z1 direction, the adhesive portion 51 of the conductive member 5 arranged on the first surface 11 is covered by the conductive portion 52 arranged on the second surface 12 and cannot be seen. This improves the appearance of the second surface 12 of the substrate 1, which is the usable surface of the solar cell module 100.

[0029] Incidentally, the adhesive portion 51 of the conductive member 5 is made of resin, and the substrate 1 and the conductive layer 2 that are in contact with the adhesive portion 51 are made of ceramics such as glass. Therefore, the linear expansion coefficient of the adhesive portion 51 (for example, 490×10-6 / °C) and the linear expansion coefficient of the substrate 1 or the conductive layer 2 (for example, 9.0 × 10 -6 / °C), which is 10 times or more different from the linear expansion coefficient (for example, 17.7 × 10 -6 / °C) is smaller than the linear expansion coefficient of the adhesive portion 51. Therefore, when the conductive member 5 is subjected to a thermal cycle and shrinks, the adhesive portion 51 tends to shrink more than the substrate 1, the conductive layer 2, and the conductive portion 52, and a large tensile shear force acts on the contact surfaces of the substrate 1, the conductive layer 2, and the conductive portion 52 with the adhesive portion 51 (see FIGS. 3 and 4). Therefore, when the solar cell module 100 is subjected to a thermal cycle, the end of the conductive member 5 peels off from the conductive layer 2, reducing the contact area between the conductive layer 2 and the conductive member 5, and deteriorating the resistance value of the solar cell module 100. In particular, as shown in FIG. 3, in the case where a conductive path is provided only on the conductive layer 2 on the first surface 11 of the substrate 1, as in the case of a conventional bus bar, the adhesive end of the conductive member 5 is located on the conductive layer 2, and therefore the conductive member 5 is likely to peel off from the conductive layer 2 and reduce the contact area therebetween.

[0030] Therefore, in this embodiment, by arranging the conductive member 5 so as to continuously cover the first edge 1A of the first surface 11, the outer end surface 13, and the second edge 1B of the second surface 12 of the substrate 1, the adhesive end of the conductive member 5 can be positioned on the first edge 1A and the second edge 1B, as shown in FIG. 4 . This allows the tensile shear force acting from the adhesive end of the conductive member 5 on the adhesive surface between the adhesive portion 51 and the substrate 1 or the conductive layer 2 to be dispersed to the first edge 1A and the second edge 1B, even if the solar cell module 100 is subjected to a thermal cycle and the adhesive portion 51 shrinks. This prevents the conductive member 5 from peeling off from the outer edge of the conductive layer 2, and therefore reduces the rate of decrease in the contact area between the conductive layer 2 and the conductive member 5, even when the solar cell module 100 is subjected to repeated thermal cycles, thereby suppressing deterioration in the electrical resistance of the solar cell module 100.

[0031] [Method for manufacturing solar cell module] Next, a method for manufacturing the solar cell module 100 will be described with reference to Figures 5 and 6. The method for manufacturing the solar cell module 100 in this embodiment includes a first step of forming the solar cell 10 and a second step of arranging the conductive member 5 on the substrate 1 and the conductive layer 2.

[0032] First, as shown in FIG. 5, a first step is performed to form a plurality of solar cell cells 10 (three in this embodiment). In the first step, a conductive layer 2 is formed on a first surface 11 of a substrate 1. The conductive layer 2 may be formed, for example, by chemical vapor deposition (CVD) or sputtering. Next, laser scribing is performed to partially remove the conductive layer 2, thereby forming a plurality of recesses 21 (three in this embodiment). Thereafter, a perovskite solar cell element 3 and an electrode 4 are formed on the Z1-side surface of the conductive layer 2 by a known method, thereby obtaining a solar cell 10. After the electrode 4 is formed, a coating material such as an insulating porous film may be disposed on the surface of the electrode 4 using an adhesive or the like.

[0033] Next, as shown in FIG. 6 , a second step is performed to place a pair of conductive members 5 on substrate 1. In the second step, first, adhesive portions 51 of conductive members 5 are attached to outer end surfaces 13, 13 of substrate 1 that are parallel to the Y direction, and these are bonded together. At this time, it is preferable to adjust the position of conductive member 5 attached to outer end surface 13 so that the length of conductive member 5 attached to first edge 1A of first surface 11 is shorter than the length of conductive member 5 attached to second edge 1B of second surface 12. After bonding conductive member 5 to outer end surface 13, the conductive member 5 protruding from outer end surface 13 is folded toward substrate 1, and conductive member 5 is bonded to first edge 1A and second edge 1B, thereby obtaining solar cell module 100 shown in FIG. 1 .

[0034] In the second step, the conductive member 5 and the outer end surface 13 are first bonded together to form a tight bond, thereby reliably covering the outer edges along the first peripheral edge 1A and the second peripheral edge 1B of the substrate 1 with the conductive member 5. This prevents air bubbles or the like from forming between the conductive member 5 and the outer end surface 13, reducing the contact area between the conductive member 5 and the outer end surface 13 and preventing the conductive member 5 from peeling off due to the air bubbles or the like. Furthermore, because the substrate 1 is thin, it is difficult to position the conductive member 5 so that it is in tight contact with the outer end surface 13 after bonding the conductive member 5 to the first peripheral edge 1A or the second peripheral edge 1B. However, this step makes it easy to form a tight bond between the outer end surface 13 and the conductive member 5.

[0035] The solar cells 10 in the solar cell module 100 may be protected by a protective layer (not shown). The protective layer may include a primary sealing layer that seals the perovskite solar cell elements 3 and prevents moisture from entering from the outside, and a secondary sealing layer that is disposed on top of the primary sealing layer and has weather resistance. The protective layer may be formed after or before the second step.

[0036] The above-described manufacturing method makes it possible to obtain a solar cell module 100 that can efficiently form conductive paths while preventing an increase in resistance value.

[0037] [Example] Examples of the solar cell module 100 according to the present invention will be described below, but the present invention is not limited to the following examples.

[0038] Example 1 The solar cell module 100 according to Example 1 was fabricated using the above-described method for manufacturing the solar cell module 100. A 100 mm square transparent glass substrate on which ITO was formed as the conductive layer 2 was used as the substrate 1. Tesa's 60238 was used as the conductive member 5, and it was arranged so as to continuously cover the first edge 1A, outer end surface 13, and second edge 1B of the substrate 1. The dimension of the conductive member 5 in the X direction at the first edge 1A was 3 mm, and the dimension of the conductive member 5 in the X direction at the second edge 1B was 7 mm.

[0039] Example 2 Example 2 was produced in the same manner as Example 1, except that a protective layer for protecting the solar cell module 100 was formed.

[0040] (Comparative Example 1) Comparative Example 1 was produced in the same manner as Example 1, except that the conductive member 5 was arranged only on the first edge 1A of the substrate 1.

[0041] (Comparative Example 2) Comparative Example 2 was produced in the same manner as Comparative Example 1, except that the adhesive force between the conductive member 5 and the conductive layer 2 was maintained by a clip.

[0042] (Comparative Example 3) Comparative Example 3 was produced in the same manner as Comparative Example 1, except that the contact area between the first edge 1A of the substrate 1 and the conductive member 5 was increased. The contact area was increased by setting the dimension of the conductive member 5 in the X direction to 10 mm.

[0043] Comparative Example 4 Comparative Example 4 was produced in the same manner as Comparative Example 1, except that a bus bar was inserted between the conductive layer 2 and the conductive member 5. A rectangular copper wire plated with lead-free solder was used as the bus bar, and the conductive member 5 was arranged so as to cover the top and side surfaces of the bus bar.

[0044] (Comparative Example 5) Comparative Example 5 was produced in the same manner as Comparative Example 1, except that silver paste was placed between the conductive layer 2 and the conductive member 5 to improve the adhesive strength between them.

[0045] A temperature cycle test was carried out for each of Examples 1 and 2 and Comparative Examples 1 to 5 in accordance with the temperature cycle test standard MQT-11 for design qualification and type certification of ground-mounted photovoltaic (PV) modules (JIS JIC-C 61215). The electrical resistance values ​​before and after the test for the Examples and Comparative Examples are shown in Table 1 below. Note that for both the Examples and Comparative Examples, the temperature cycle test was carried out by subjecting them to temperature cycles from -40°C to 80°C the number of times shown in Table 1 below. [Table 1]

[0046] As shown in Table 1, Examples 1 and 2 showed little change in electrical resistance before and after the test. This shows that arranging the conductive members 5 on the first edge 1A, outer end surface 13, and second edge 1B can improve the durability of the solar cell module 100. In particular, Example 2 showed good results, with little change in electrical resistance before and after the test even after 29 temperature cycles.

[0047] On the other hand, in Comparative Examples 1 to 5, in which the conductive member 5 was disposed only on the first edge 1A, the change in electrical resistance before and after the test was large in all cases, and it can be said that the conductive member 5 was easily peeled off from the conductive layer 2. Furthermore, since the electrical resistance values ​​after the test in Comparative Example 1 and Comparative Example 3 were similar, it was inferred that even if the contact area between the conductive layer 2 and the conductive member 5 was increased, if the outer edge of the substrate 1 was not covered with the conductive member 5, the conductive member 5 would peel off from the outer edge of the substrate 1.

[0048] When silver paste or a bus bar was placed between the conductive member 5 and the conductive layer 2, as in Comparative Examples 4 and 5, it was thought that the conductive member 5 was easily peeled off from the first edge 1A because there was a large difference in the linear expansion coefficient between the adhesive portion 51 of the conductive member 5 and other members.

[0049] In the above-described embodiment, the following configurations are envisioned. (1) A solar cell module 100 comprising: an electrically conductive layer 2 arranged on a first surface 11 of a substrate 1; a perovskite solar cell element 3 arranged on the electrically conductive layer 2; an electrode 4 arranged on the perovskite solar cell element 3; and an electrically conductive member 5 arranged so as to be electrically connected to the electrically conductive layer 2 at a first edge 1A on the first surface 11 of the substrate 1, the electrically conductive member 5 having an adhesive adhesive portion 51 and an electrically conductive conductive portion 52, wherein the electrically conductive member 5 continuously covers the first edge 1A and the outer edge of the substrate 1 along the first edge 1A.

[0050] According to this configuration, the adhesive portion 51 of the conductive member 5 adheres to the first edge 1A of the conductive layer 2, whereby the conductive portion 52 disposed on the conductive layer 2 collects power generated by the perovskite solar cell element 3, and the conductive member 5 acts as a conductive path. Therefore, compared to a configuration in which a bus bar serving as a conductive path is disposed on the conductive layer 2 with an adhesive or the like, the conductive path can be formed more easily. Furthermore, because the conductive member 5 continuously covers the first edge 1A and the outer edge of the substrate 1 along the first edge 1A, even if the solar cell module 100 is subjected to a thermal cycle, causing the adhesive portion 51 of the conductive member 5 to shrink and the end of the conductive member 5 to peel off from the conductive layer 2, contact between the conductive layer 2 and the conductive member 5 is maintained on the outer edge side of the first edge 1A. This suppresses a decrease in the contact area between the conductive layer 2 and the conductive member 5 due to shrinkage of the adhesive portion 51 caused by the thermal cycle, and prevents an increase in the electrical resistance of the solar cell module 100.

[0051] (2) In the solar cell module 100 of (1), it is preferable that the conductive member 5 continuously covers the second edge 1B on the second surface 12 opposite the first surface 11 of the substrate 1 and the outer end surface 13 along the first edge 1A and second edge 1B of the substrate 1.

[0052] According to this configuration, one end of the conductive member 5 is located on the first edge 1A, and the other end is located on the second edge 1B, so even if the solar cell module 100 is subjected to a thermal cycle and the adhesive portion 51 of the conductive member 5 shrinks, the outer end surface 13 of the substrate 1 remains covered by the conductive member 5. This prevents a decrease in the contact area between the adhesive portion 51 and the conductive layer 2 due to the thermal cycle, and prevents an increase in the electrical resistance value of the solar cell module 100.

[0053] (3) In the solar cell module 100 of (2), it is preferable that the size of the conductive member 5 covering the second edge 1B is larger than the size of the conductive member 5 covering the first edge 1A.

[0054] According to this configuration, when looking at the second surface 12, which is the use surface of the solar cell module 100, the adhesive portion 51 of the conductive member 5 located on the first edge 1A is covered by the conductive member 5 located on the second edge 1B, thereby improving the appearance of the solar cell module 100.

[0055] (4) A method for manufacturing a solar cell module (100) including: a first step of forming a solar cell (10) by arranging an electrically conductive conductive layer (2), a perovskite solar cell element (3), and an electrode (4) in this order on a first surface (11) of a substrate (1); and a second step of arranging a conductive member (5) having an adhesive adhesive portion (51) and an electrically conductive portion (52) on the substrate (1) or the electrically conductive layer (2), wherein the second step bonds the adhesive portion (51) to the outer end surface (13) of the substrate (1), and then bonds the adhesive portion (51) to a first edge (1A) on the first surface (11) of the substrate (1) and a second edge (1B) on the second surface (12) opposite the first surface (11).

[0056] According to this configuration, conductive member 5 having adhesive adhesive portion 51 and conductive conductive portion 52 is disposed on substrate 1 or conductive layer 2, thereby efficiently forming a conductive path. Furthermore, by bonding adhesive portion 51 of conductive member 5 to outer end surface 13 of substrate 1 and then bonding first peripheral edge 1A and second peripheral edge 1B to adhesive portion 51, conductive member 5 can be disposed along outer end surface 13 of substrate 1, thereby preventing the formation of voids or the like between conductive member 5 and substrate 1. Therefore, even if adhesive portion 51 shrinks due to thermal cycling, contact between conductive layer 2 and conductive member 5 on the outer edge side of first peripheral edge 1A can be maintained, thereby preventing a decrease in the contact area between adhesive portion 51 and conductive layer 2 and preventing an increase in the electrical resistance of solar cell module 100.

[0057] Other Embodiments (a) In the above embodiment, the conductive member 5 covers the second edge 1B on the second surface 12 of the substrate 1. However, as shown in Fig. 7, the second edge 1B does not have to be covered by the conductive member 5. In the example shown in Fig. 7, the conductive member 5 covers the outer end surface 13 of the substrate 1. Therefore, even if the solar cell module 100 is subjected to a thermal cycle and the conductive member 5 peels off from the adhesive end, the adhesive portion 51 at the outer end of the conductive layer 2 can be maintained in adhesion. This allows the contact area between the conductive layer 2 and the conductive member 5 to be maintained at a reduced level, preventing a deterioration in electrical resistance.

[0058] 7, the conductive member 5 covers the outer end surface 13 of the substrate 1, but the entire outer end surface 13 does not have to be covered by the conductive member 5. If the outer edge of the substrate 1 is covered by the conductive member 5, peeling of the conductive member 5 on the outer edge side of the conductive layer 2 can be suppressed.

[0059] (c) In the above embodiment, the conductive member 5 is disposed instead of the bus bar, but the conductive member 5 may be connected to the bus bar B at the end of the conductive member 5 in the Y direction. As shown in FIG. 8 , the bus bar B may be disposed on the conductive layer 2 and covered with the conductive member 5. This makes it possible to connect the solar cell module 100 to an external device with a bus bar while minimizing the reduction in the contact area between the bus bar B and the conductive member 5. [Industrial Applicability]

[0060] The present invention can be used for a solar cell module having a perovskite solar cell element and a method for manufacturing the solar cell module. [Explanation of symbols]

[0061] 1: substrate, 1A: first edge, 1B: second edge, 2: conductive layer, 3: perovskite solar cell element, 4: electrode, 5: conductive member, 10: solar cell, 11: first surface, 12: second surface, 13: outer end surface, 51: adhesive portion, 52: conductive portion, 100: solar cell module

Claims

1. an electrically conductive layer disposed on a first surface of the substrate; a perovskite solar cell element disposed on the conductive layer; and an electrode disposed on the perovskite solar cell element; a conductive member disposed at a first edge on the first surface of the substrate so as to be electrically connected to the conductive layer, the conductive member having an adhesive portion and a conductive portion; The conductive member continuously covers the first edge and an outer edge of the substrate along the first edge of the solar cell module.

2. 2. The solar cell module according to claim 1, wherein the conductive member continuously covers a second edge on a second surface of the substrate opposite the first surface and an outer end surface along the first edge and the second edge of the substrate.

3. The solar cell module according to claim 2 , wherein the conductive member covering the second edge has a dimension larger than the dimension of the conductive member covering the first edge.

4. a first step of forming a solar cell by disposing an electrically conductive layer, a perovskite solar cell element, and an electrode, in this order, on a first surface of a substrate; a second step of disposing a conductive member having an adhesive portion and a conductive portion on the substrate or the conductive layer, In the second step, after bonding the outer end surface of the substrate and the bonding portion, A method for manufacturing a solar cell module, comprising bonding the adhesive portion to a first edge on the first surface of the substrate and a second edge on a second surface opposite to the first surface.

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