JP6925434B2 - Solar cell module - Google Patents

Description

The present disclosure relates to solar cell modules.

The solar cell module is a laminated type (tandem type) solar cell in which a top cell on the front side and a bottom cell on the back side are laminated via a transparent insulating layer from the front side to the back side where light is incident. There are modules (see, for example, the descriptions in JP-A-2005-277113 and JP-A-2010-67752).

The solar cell module is disclosed.

One aspect of the solar cell module is a first protective member, a second protective member, a first solar cell section, a second solar cell section, a third protective member, a first sealing material, and a second seal. It is equipped with a stop material. The first protective member has translucency. The first solar cell unit is located between the first protective member and the second protective member. The second solar cell unit is located between the first solar cell unit and the second protective member. The third protective member is located between the first solar cell section and the second solar cell section, and has translucency. The first sealing material is located in a first region between the first protective member and the third protective member in a state of covering the first solar cell portion, and has translucency. The second sealing material is located in a second region between the second protective member and the third protective member in a state of covering the second solar cell portion, and has translucency. The moisture permeability of the first protective member and the third protective member is lower than the moisture permeability of the first sealing material and the second sealing material. The thickness of the first encapsulant is smaller than the thickness of the second encapsulant.
One aspect of the solar cell module is a first protective member, a second protective member, a first solar cell section, a second solar cell section, a third protective member, a first sealing material, and a second seal. It is equipped with a stop material. The first protective member has translucency. The first solar cell unit is located between the first protective member and the second protective member. The second solar cell unit is located between the first solar cell unit and the second protective member. The third protective member is located between the first solar cell section and the second solar cell section, and has translucency. The first sealing material is located in a first region between the first protective member and the third protective member in a state of covering the first solar cell portion, and has translucency. The second sealing material is located in a second region between the second protective member and the third protective member in a state of covering the second solar cell portion, and has translucency. The moisture permeability of the first protective member and the third protective member is lower than the moisture permeability of the first sealing material and the second sealing material. The second solar cell unit has a solar cell element having a light receiving surface located so as to face the third protective member.

FIG. 1A is a plan view showing the appearance of an example of the solar cell module according to the first embodiment as viewed from the front side. FIG. 1B is a diagram showing an example of a virtual cut surface portion of the solar cell module along the line Ib-Ib of FIG. 1A. FIG. 2 is a plan view showing the appearance of an example of the first protective member as viewed from the front side. FIG. 3A is a plan view showing an example structure of the first solar cell unit. FIG. 3B is a diagram showing an example of a virtual cut surface portion of the first solar cell portion along the line IIIb-IIIb of FIG. 3A. FIG. 4 is a plan view showing the structure of an example of the third protective member. FIG. 5 is a plan view showing the structure of an example of the second solar cell unit. FIG. 6A is a plan view showing a structure of an example of the second solar cell element as viewed from the surface side of the first element. FIG. 6B is a plan view showing a structure of an example of the second solar cell element as viewed from the surface side of the second element. FIG. 7 is a plan view showing the structure of an example of the second protective member. 8 (a) and 8 (b) are virtual cut surface portions corresponding to the virtual cut surface portions of FIG. 1 (b) in the state of manufacturing the solar cell module according to the first embodiment, respectively. It is a figure exemplifying. FIG. 9 is a diagram showing a virtual cut surface portion corresponding to a virtual cut surface portion along the line Ib-Ib of FIG. 1A in an example of the solar cell module according to the second embodiment.

The tandem type solar cell module includes, for example, a transparent plate such as a glass plate constituting a light receiving surface (also referred to as a front surface), a top cell on the front side in which light transmitted through the transparent plate is incident, and a bottom cell on the back surface side. Has. Here, for example, if the top cell has a thin-film solar cell element including a thin-film semiconductor and a transparent electrode, a situation may occur in which the moisture resistance of the top cell cannot be said to be high. In this situation, for example, if a resin backsheet is placed on the back side of the solar cell module, the moisture that has passed through the resin backsheet or the like will be the top cell due to the long-term outdoor use of the solar cell module. It is possible to reach up to. In this case, the top cell is liable to deteriorate due to long-term outdoor use of the solar cell module, which causes a decrease in the reliability of the tandem type solar cell module.

Therefore, the present inventors have created a technique capable of easily improving the reliability of the solar cell module. Hereinafter, various embodiments will be described with reference to the drawings. In the drawings, parts having the same structure and function are designated by the same reference numerals, and duplicate description will be omitted in the following description. The drawings are schematically shown. A right-handed XYZ coordinate system is attached to FIGS. 1 (a) to 9 (a). In this XYZ coordinate system, the longitudinal direction (also referred to as the first direction) of the front surface 1 fs of the solar cell module 1 described later is the + X direction, and the lateral direction (also referred to as the second direction) of the front surface 1 fs is the + Y direction. The normal direction of the front surface 1 fs is the + Z direction.

<1. First Embodiment>
<1-1. Solar cell module ＞
The solar cell module 1 according to the first embodiment will be described with reference to FIGS. 1A to 7.

As shown in FIGS. 1 (a) and 1 (b), the solar cell module 1 has a light receiving surface (also referred to as a front surface) 1 fs on which light is mainly incident, and a back surface 1 bs located on the opposite side of the front surface 1 fs. And have. In the first embodiment, the front surface 1fs is in a state of facing the + Z direction. The back surface 1bs is in a state of facing the −Z direction. For example, the + Z direction is set to face the sun in the south. In the examples of FIGS. 1A and 1B, the front surface 1fs and the back surface 1bs have a rectangular shape.

As shown in FIGS. 1A and 1B, the solar cell module 1 includes, for example, a solar cell panel PN1. Further, the solar cell module 1 may include, for example, a terminal box and a frame. The terminal box is located, for example, on the back surface 1bs of the solar cell panel PN1. This terminal box can output the electricity obtained by the power generation in the solar cell panel PN1 to the outside, for example. The frame is located, for example, along the outer peripheral portion of the solar cell panel PN1. This frame can protect the outer peripheral portion of the solar cell panel PN1, for example.

The solar cell panel PN1 includes, for example, a first protective member PR1, a second protective member PR2, a third protective member PR3, a first solar cell section SL1, a second solar cell section SL2, and a first sealing material. It includes F1, a second sealing material F2, and a packing portion Pk0. The first protective member PR1 is located, for example, in a state of forming the front surface 1 fs of the solar cell panel PN1. The second protective member PR2 is located, for example, in a state of forming the back surface 1bs of the solar cell panel PN1. The second sealing material F2 is a second sealing material (also referred to as a second sealing material on the front side) F2u on the front surface 1fs side and a second sealing material (also referred to as a second sealing material on the back surface side) on the back surface 1bs side. ) F2b and.

In the example of FIG. 1B, the first protective member PR1, the first solar cell unit SL1, the first sealing material F1, the third protective member PR3, and the second front side sealing are directed from the front surface 1fs to the back surface 1bs. The material F2u, the second solar cell unit SL2, the second sealing material F2b on the back surface side, and the second protective member PR2 are located in a state of being laminated in the order described. The packing portion Pk0 is located, for example, along the outer peripheral portion of the region (also referred to as the first region) AR1 between the first protective member PR1 and the third protective member PR3. In other words, the packing portion Pk0 is located so as to surround the outer peripheral portion of the region including, for example, the first solar cell portion SL1 and the first sealing material F1.

<1-1-1. 1st protective member>
The first protective member PR1 is a member having translucency. Specifically, the first protective member PR1 has, for example, translucency with respect to light having a wavelength in a specific range. As the wavelength in the specific range, for example, the wavelength of light that can be photoelectrically converted by the first solar cell unit SL1 and the second solar cell unit SL2 is adopted. If the wavelength in a specific range includes the wavelength of light having high irradiation intensity that constitutes sunlight, the photoelectric conversion efficiency of the solar cell module 1 can be improved. Here, if a resin such as glass or acrylic or polycarbonate is applied to the material of the first protective member PR1, the low humidity permeability of the first protective member PR1 and the translucency to light of a specific range wavelength are obtained. It will be realized. For the first protective member PR1, for example, a flat plate having a thickness of about 1 mm to 5 mm is applied. The first protective member PR1 having the above configuration can protect the first solar cell section SL1 and the second solar cell section SL2 from the front surface 1fs side, for example, by providing appropriate rigidity and low moisture permeability. The first solar cell unit SL1 and the second solar cell SL2 have different band gaps from each other, and the wavelengths of light absorbed by each other are different.

In the examples of FIGS. 1A and 2, the first protective member PR1 has a rectangular outer shape when viewed in a plan view from the front surface 1fs side. Further, the first protective member PR1 has, for example, a first side E1a and a second side E1b located on opposite sides of each other along the first direction (+ X direction) when viewed in a plan view from the front surface 1fs side, and a second side. It has a third side E1c and a fourth side E1d located on opposite sides of each other along the direction (+ Y direction).

<1-1-2. 1st solar cell section>
The first solar cell unit SL1 is located, for example, between the first protective member PR1 and the second protective member PR2 on the side closer to the first protective member PR1 than the second solar cell unit SL2. In the first embodiment, the first solar cell unit SL1 is located between, for example, the first protective member PR1 and the third protective member PR3.

As shown in FIGS. 3A and 3B, the first solar cell unit SL1 has, for example, a plurality of solar cell elements (also referred to as first solar cell elements) C1. For the first solar cell element C1, for example, a solar cell element using a thin film semiconductor (also referred to as a thin film semiconductor) (also referred to as a thin film solar cell element) or the like can be adopted. As the thin film semiconductor, for example, a silicon-based semiconductor, a compound-based semiconductor, or another type of semiconductor may be adopted. As the silicon-based thin-film semiconductor, for example, a semiconductor using amorphous silicon, thin-film polycrystalline silicon, or the like is applied. Examples of the compound-based thin film semiconductor include a compound semiconductor having a calcopalite structure such as a CIS semiconductor or a CIGS semiconductor, a compound semiconductor such as a compound having a perovskite structure, a compound semiconductor having a kesterite structure, or a cadmium telluride (CdTe) semiconductor. Applies. The CIS semiconductor is a compound semiconductor containing copper (Cu), indium (In) and selenium (Se). CIGS semiconductors are compound semiconductors containing copper (Cu), indium (In), gallium (Ga) and selenium (Se). In the examples of FIGS. 3A and 3B, each first solar cell element C1 has, for example, a thin film semiconductor.

In the first solar cell unit SL1, for example, a plurality of first solar cell elements C1 are located so as to be arranged in a plane. Here, "arranged in a plane" means that each first solar cell element C1 is located along a virtual or actual plane, and a plurality of first solar cell elements C1 are arranged in a plane. In the first embodiment, the plurality of first solar cell elements C1 are located on the first protective member PR1 acting as a substrate in a state of being arranged along the surface of the first protective member PR1. Here, for example, it is assumed that the first solar cell unit SL1 includes N first solar cell elements C1 (N is a natural number of 2 or more). In this case, for example, if N first solar cell elements C1 are electrically connected in series, the larger the numerical value N, the larger the output voltage of the first solar cell unit SL1 can be.

In FIGS. 3A and 3B, a plurality of (here, 7) first solar cell elements C1 are arranged in a state of being arranged along the second direction (+ Y direction). It is shown. Here, for example, each first solar cell element C1 has an elongated shape having a longitudinal direction along the first direction (+ X direction). In this case, for example, if the width of the first solar cell element C1 in the second direction is about several mm to 1 cm, the first solar cell unit SL1 has several tens to several hundreds of first solar cell elements. It can be located in a state where C1s are lined up. Then, for example, the case where the first direction is the horizontal direction can be considered. In this case, even if a shadow extending along the second direction caused by a vertically long object such as a telephone pole or a tree is cast on the solar cell module 1, a part of the first solar cell element C1 is irradiated with light. It is unlikely that the amount will be significantly lower than that of the other second solar cell element C2. Therefore, for example, by electrically connecting a plurality of first solar cell elements C1 in series, it is possible to realize a somewhat high output voltage in the first solar cell unit SL1, but the first solar cell unit. The output current in SL1 is unlikely to drop significantly.

Here, for example, when viewed in a plan view, the first solar cell module 1 is along the first direction (+ X direction) rather than the length in the direction (also referred to as the vertical direction) along the second direction (+ Y direction). It is assumed that the width in the vertical direction (also referred to as the horizontal direction) has a longer shape (also referred to as a horizontally long shape). In this case, for example, even if the output voltage of each first solar cell element C1 of the first solar cell unit SL1 is higher than the output voltage of each second solar cell element C2 described later of the second solar cell unit SL2. , The number of first solar cell elements C1 electrically connected in series in the first solar cell unit SL1 can be easily reduced. Thereby, for example, the output voltage (also referred to as the first output voltage) obtained by the first solar cell unit SL1 can be easily brought close to the output power (also referred to as the second output voltage) obtained by the second solar cell unit SL2. Can be done. As a result, for example, even when the first solar cell unit SL1 and the second solar cell unit SL2 are electrically connected in parallel, electrical loss is unlikely to occur, and the photoelectric conversion efficiency in the solar cell module 1 is improved. Can be improved.

Each first solar cell element C1 has, for example, a first electrode layer 1a, a semiconductor layer 1b, and a second electrode layer 1c, as shown in FIG. 3B. Further, in the first solar cell unit SL1, for example, as shown in FIG. 3B, a connection unit 4 exists between adjacent first solar cell elements C1.

Here, for example, if the first electrode layer 1a and the second electrode layer 1c are layers having higher translucency to light having a specific range of wavelengths than the semiconductor layer 1b (also referred to as a translucent electrode layer), each of them. In the first solar cell element C1, the incident light can pass through the first electrode layer 1a and the second electrode layer 1c. Thereby, for example, the incident light transmitted through the first protective member PR1 can be transmitted through the first electrode layer 1a and irradiated to the semiconductor layer 1b. At this time, for example, a part of the incident light can be absorbed by the semiconductor layer 1b. Here, among the incident light, the light that has passed through the semiconductor layer 1b without being absorbed by the semiconductor layer 1b passes through the second electrode layer 1c and is directed from the first solar cell unit SL1 to the second solar cell unit SL2. Exit.

The first electrode layer 1a is located, for example, on the −Z side surface of the first protective member PR1. The first electrode layer 1a can collect, for example, the electric charges generated by the photoelectric conversion in response to the irradiation of light in the semiconductor layer 1b. If, for example, a transparent conductive oxide (TCO) having transparency to light having a specific range of wavelengths is applied to the material of the first electrode layer 1a, light having a specific range of wavelengths can be emitted. It can pass through the first protective member PR1 and the first electrode layer 1a and be incident on the semiconductor layer 1b. TCO includes, for example, indium tin oxide (ITO: Indium Tin Oxide), fluorine-doped tin oxide (FTO), zinc oxide (ZnO), and the like. Here, for example, when the TCO contains zinc oxide, the TCO may contain aluminum (Al), boron (B) or gallium (Ga), if necessary.

In the example of FIG. 3B, the seven first electrode layers 1a are located on the first protective member PR1 in a state where they are arranged in a plane along the + Y direction. Here, the first electrode layer 1a of the first m first solar cell element C1m (m is a natural number from 1 to 6) and the first electrode layer 1a of the first (m + 1) first solar cell element C1 (m + 1). Are located side by side with a gap (also referred to as a first gap) G1 in between. For example, the first electrode layer 1a of the first first solar cell element C11 and the first electrode layer 1a of the second first solar cell element C12 are arranged side by side with a gap (also referred to as a first gap) G1 in between. It is located in the state of being. Each first gap G1 has a longitudinal direction along the + X direction. Further, there is a first groove portion P1 having the first protective member PR1 as the bottom surface and two end faces facing each other of the two first electrode layers 1a sandwiching the first gap G1 as side surfaces.

The semiconductor layer 1b is located between the first electrode layer 1a and the second electrode layer 1c. Here, the semiconductor layer 1b of the first m first solar cell element C1m is in the −Y direction of the first electrode layer 1a of the adjacent (m + 1) first solar cell element C1 (m + 1) in the + Y direction. It is located over the side edge. For example, the semiconductor layer 1b of the first first solar cell element C11 extends over the end portion of the first electrode layer 1a of the adjacent second first solar cell element C12 in the + Y direction on the −Y direction side. positioned. The semiconductor layer 1b is in a state of being composed of, for example, the above-mentioned thin film semiconductor. At this time, the first solar cell element C1 can mainly absorb visible light and use it for photoelectric conversion. Such thin-film semiconductors tend to have lower moisture resistance than the semiconductor substrate Su2 of the second solar cell section SL2, which will be described later.

The second electrode layer 1c is located on the semiconductor layer 1b. The second electrode layer 1c can collect the electric charges generated by the photoelectric conversion in response to the irradiation of light in the semiconductor layer 1b. As the material of the second electrode layer 1c, for example, a material having translucency with respect to light having a wavelength in a specific range is applied, similarly to the material of the first electrode layer 1a. As the material of the second electrode layer 1c, for example, a transparent conductive oxide (TCO) having translucency with respect to light having a wavelength in a specific range can be adopted as in the case of the first electrode layer 1a. TCO includes, for example, ITO, FTO, ZnO and the like. The translucent electrode layer including the first electrode layer 1a and the second electrode layer 1c tends to have lower moisture resistance than various metal electrodes of the second solar cell unit SL2 described later. In other words, the translucent electrode layer is easily corroded by the influence of moisture or the like. If the translucent electrode layer is corroded, for example, the surface resistance of the translucent electrode layer may increase, and the output characteristics of the first solar cell unit SL1 may deteriorate.

In the example of FIG. 3B, the seven second electrode layers 1c are located so as to be arranged in a plane along the + Y direction. Here, the second electrode layer 1c of the first m first solar cell element C1m and the second electrode layer 1c of the first (m + 1) first solar cell element C1 (m + 1) are in a gap (also referred to as a second gap). ) They are located side by side with G2 in between. For example, the second electrode layer 1c of the first first solar cell element C11 and the second electrode layer 1c of the second first solar cell element C12 are lined up with a gap (second gap) G2 in between. It is located in a state. Each second gap G2 has a longitudinal direction along the + X direction. Further, each of the second gaps G2 is in a state of forming a third groove portion P3 having the first electrode layer 1a as the bottom surface. In each first solar cell element C1, the second electrode layer 1c is positioned so as to protrude in the + Y direction than the first electrode layer 1a. From another point of view, the second gap G2 exists at a position deviated from the first gap G1 in the second direction (+ Y direction).

The connection portion 4 is located in a state where two adjacent first solar cell elements C1 among the plurality of first solar cell elements C1 are electrically connected in series. In the example of FIG. 3B, the mth connection portion 4m is located so as to penetrate the semiconductor layer 1b. The mth connection portion 4m is located in a state where the first m first solar cell element C1m and the first (m + 1) first solar cell element C1 (m + 1) are electrically connected. For example, the first connection portion 41 is located in a state where the first first solar cell element C11 and the second first solar cell element C12 are electrically connected. More specifically, the connection portion 4m of the first m is the first electrode layer 1c of the second electrode layer 1c of the first solar cell element C1m of the first m and the first electrode layer 1a of the first solar cell element C1 (m + 1) of the (m + 1) th. It is located in a state where it is electrically connected to. For example, the first connecting portion 41 electrically connects the second electrode layer 1c of the first first solar cell element C11 and the first electrode layer 1a of the second first solar cell element C12. It is located in a state. As a result, a plurality of first solar cell elements C1 may be electrically connected in series. Further, the connecting portion 4 exists in the second groove portion P2 having the end faces of the semiconductor layer 1b as both side surfaces and the surface of the first electrode layer 1a in the −Z direction as the bottom surface. Each second groove P2 has a longitudinal direction along the + X direction. Then, the second groove portion P2 is located in a state where the connecting portion 4 is filled.

In the first first solar cell element C11, a portion (also referred to as a first protruding portion) 1ae in which the first electrode layer 1a protrudes in the −Y direction from the semiconductor layer 1b and the second electrode layer 1c. Has. In the seventh solar cell element C17, the semiconductor layer 1b and the second electrode layer 1c are located so as to project in the + Y direction from the first electrode layer 1a. Then, in the seventh first solar cell element C17, the second electrode layer 1c is in a state of protruding in the + Y direction from the first electrode layer 1a and the semiconductor layer 1b (also referred to as a second protruding portion). Has 1 ce.

A wiring W1 for output having a first polarity (also referred to as a first wiring W1a) is electrically connected to the first protruding portion 1ae. Here, for example, the first wiring W1a is located along the end side of the first solar cell element C11 on the −Y direction side. A wiring W1 for output having a second polarity (also referred to as a second wiring W1b) is electrically connected on the second protrusion 1ce. Here, for example, the second wiring W1b is located along the end side of the seventh first solar cell element C17 on the + Y direction side. Further, for example, if the first polarity is the negative electrode, the second polarity is the positive electrode. For example, if the first polarity is positive, the second polarity is negative.

Here, for example, it is assumed that the wiring is separately drawn from the first solar cell unit SL1 and the second solar cell unit SL2 to the outside of the solar cell module 1. In this case, for example, the first wiring W1a and the second wiring W1b are pulled out to the outside via between the third protective member PR3 and the packing portion Pk0.

Here, for example, it is assumed that the first solar cell unit SL1 and the second solar cell unit SL2 are electrically connected in parallel and then the wiring is pulled out to the outside of the solar cell module 1. In this case, for example, the first wiring W1a and the second wiring W1b are inserted into the through hole of the third protective member PR3 and connected to the wiring in a state of being joined to the second solar cell unit SL2. 2 It is pulled out to the outside through the through hole of the protective member PR2.

<1-1-3. 1st encapsulant>
The first sealing material F1 is located, for example, in a state of covering the first solar cell unit SL1 in the first region AR1 between the first protective member PR1 and the third protective member PR3. In the first embodiment, for example, the solar cell unit SL1 located on the first protective member PR1 is located so as to cover the entire surface of the third protective member PR3 side. Thereby, the first sealing material F1 can seal, for example, the first solar cell unit SL1. In the example of FIG. 1B, the first sealing material F1 is located in a state of being filled in the first region AR1.

Further, the first sealing material F1 has a translucent property. As a result, for example, among the light transmitted through the first protective member PR1 and incident, the light transmitted through the first solar cell unit SL1 without being absorbed by the first solar cell unit SL1 is the first sealing material. It can pass through F1.

Examples of the material of the first encapsulant F1 include ethylene vinyl acetate copolymer (EVA), triacetyl cellulose (TAC), and polyethylene naphthalate (PEN), which have excellent translucency to light having a specific wavelength range. Polyester resin and the like can be adopted. The first sealing material F1 may be in a state of being composed of, for example, two or more kinds of materials.

<1-1-4. Packing part ＞
The packing portion Pk0 is located along the outer peripheral portion of the first region AR1 between the first protective member PR1 and the third protective member PR3. From another point of view, the packing portion Pk0 is a portion of the first region AR1 between the first protective member PR1 and the third protective member PR3, which is located in an annular shape that is open to the external space. It is located along (also called the opening). The packing portion Pk0 is positioned so as to fill the region from the first protective member PR1 to the third protective member PR3, for example. The packing portion Pk0 has a lower moisture permeability than the first sealing material F1. Therefore, the packing portion Pk0 can, for example, seal a portion of the region between the first protective member PR1 and the third protective member PR3 along the outer peripheral portion. Thereby, for example, the packing unit Pk0 can reduce the intrusion of moisture and the like from the outside of the solar cell module 1 toward the first solar cell unit SL1. As a result, for example, the long-term reliability of the solar cell module 1 can be improved.

For example, a butyl resin, a polyisopropylene resin, an acrylic resin, or the like is applied to the material of the packing portion Pk0. The material of the packing portion Pk0 may include, for example, a metal such as copper or solder or a non-metal such as glass as long as it is a material having low moisture permeability. For example, the packing portion Pk0 may be in a state where the copper foil is bonded by soldering, or may be in a state where the glass is melted by a laser or the like and then solidified.

<1-1-5. Third protective member>
The third protective member PR3 is located, for example, between the first solar cell unit SL1 and the second solar cell unit SL2. Further, the third protective member PR3 is a member having translucency. Specifically, the third protective member PR3 has, for example, translucency with respect to light having a wavelength in a specific range. As a result, among the incident light from the front surface 1fs side, the light transmitted through the first solar cell section SL1 and the first sealing material F1 without being absorbed by the first solar cell section SL1 causes the third protective member PR3. It can be transmitted and emitted toward the second solar cell unit SL2.

Here, for example, if the moisture permeability of the first protective member PR1 and the third protective member PR3 is lower than the moisture permeability of the first sealing material F1 and the second sealing material F2, the second protective member is from the back surface 1bs side. Moisture that has permeated through PR2 and the second sealing material F2 is less likely to reach the first solar cell section SL1. As a result, for example, deterioration due to moisture in the first solar cell unit SL1 is unlikely to occur. As a result, for example, the reliability of the tandem type solar cell module 1 can be improved. Here, the moisture permeability of the first protective member PR1, the third protective member PR3, the first sealing material F1 and the second sealing material F2 is determined by, for example, atmospheric pressure ionization mass spectrometry (API-MS). It can be measured and evaluated by spectrometry) or the Mocon method.

Here, the moisture permeability of the first protective member PR1 and the third protective member PR3 is, for example, 5 g / m. ²It may be set to / day or less. The moisture permeability of the first sealing material F1 and the second sealing material F2 is, for example, 10 g / m.²It may be set to / day or higher.

Here, if, for example, a plate-shaped member having translucency is applied to the third protective member PR3, the moisture permeability of the third protective member PR3 is changed to the first encapsulant F1 and the second encapsulant F2. It can be lower than the moisture permeability of. If, for example, glass or a resin such as acrylic or polycarbonate is applied to the material of the third protective member PR3, low humidity permeability and translucency to light having a specific range of wavelengths are realized. For example, a plate-shaped member having a thickness of about 0.5 mm to several mm is applied to the third protective member PR3. The third protective member PR3 having such a configuration can protect the first solar cell unit SL1 from the back surface 1bs side by, for example, low moisture permeability.

By the way, for example, if a relatively thin resin back sheet is applied to the second protective member PR2 described later, moisture easily permeates the second protective member PR2 and the second sealing material F2 from the back surface 1bs side. .. On the other hand, for example, a third protective member PR3 having a lower moisture permeability than the first sealing material F1 and the second sealing material F2 is located between the first solar cell unit SL1 and the second solar cell unit SL2. If this is done, it is difficult for the moisture that has passed through the second protective member PR2 and the second sealing material F2 from the back surface 1bs side to reach the first solar cell unit SL1. As a result, for example, deterioration due to moisture in the first solar cell unit SL1 is unlikely to occur. As a result, for example, the reliability of the tandem type solar cell module 1 can be improved.

Further, for example, in the case of applying a plate-shaped member (also referred to as a plate-shaped member) such as a glass plate to the second protective member PR2 in order to reduce the infiltration of water from the back surface 1bs side of the solar cell module 1. Is assumed. In this case, for example, it is necessary to increase the thickness of the plate-shaped member to some extent from the viewpoint of impact resistance and the like. Therefore, for example, the weight of the solar cell module 1 can be increased. As a result, for example, workability in the transportation work and the installation work of the solar cell module 1 is deteriorated.

On the other hand, in the first embodiment, for example, the third protective member PR3 located between the first solar cell unit SL1 and the second solar cell unit SL2 is exposed on both the back surface 1 bs and the front surface 1 fs. Therefore, it is not necessary to increase the thickness of the third protective member PR3. Therefore, while reducing the increase in the weight of the solar cell module 1, due to the presence of the third protective member PR3, for example, the moisture that has permeated through the second protective member PR2 and the second sealing material F2 from the back surface 1bs side is first. It is possible to make it difficult to reach the solar cell unit SL1. Therefore, for example, the reliability of the tandem type solar cell module 1 can be improved while reducing the increase in weight. Here, for example, when the durability (moisture resistance) of the first solar cell unit SL1 against the ingress of moisture is low, the reliability of the solar cell module 1 is remarkably improved by the presence of the third protective member PR3. be able to.

In the examples of FIGS. 1A and 4, the third protective member PR3 has a rectangular outer shape when viewed in a plane from the front surface 1fs side. The third protective member PR3 has, for example, the first side E3a and the second side E3b located on opposite sides of each other along the first direction (+ X direction) when viewed in a plane from the front surface 1fs side, and the second direction ( It has a third side E3c and a fourth side E3d located on opposite sides of each other along the + Y direction).

<1-1-6. 2nd solar cell section>
The second solar cell unit SL2 is located, for example, between the first solar cell unit SL1 and the second protective member PR2. More specifically, the second solar cell unit SL2 is located between, for example, the third protective member PR3 and the second protective member PR2. As shown in FIG. 5, the second solar cell unit SL2 has, for example, a plurality of solar cell elements (also referred to as second solar cell elements) C2. In the second solar cell unit SL2, for example, a plurality of second solar cell elements C2 are located in a state of being arranged in a plane. Each second solar cell element C2 includes, for example, a semiconductor substrate Su2, as shown in FIGS. 6 (a) and 6 (b).

Further, for example, the wiring W2 is located in a state where a plurality of second solar cell elements C2 are electrically connected in series. Here, the planar arrangement means that each second solar cell element C2 is located and a plurality of second solar cell elements C2 are arranged along a virtual or actual plane. In the first embodiment, the plurality of second solar cell elements C2 are located so as to be arranged along the surface of the third protective member PR3. Further, it is assumed that the second solar cell unit SL2 includes, for example, n (n is a natural number of 2 or more) second solar cell elements C2. In this case, for example, if n second solar cell elements C2 are electrically connected in series, the larger the numerical value n, the larger the output voltage of the second solar cell unit SL2 can be.

Each second solar cell element C2 can convert light energy into electrical energy. As shown in FIGS. 6A and 6B, the second solar cell element C2 is located on the first surface (also referred to as the first element surface) Sf1 and on the back side of the first element surface Sf1. It has a second surface (also referred to as a second element surface) Sf2. In the second solar cell element C2, for example, the first element surface Sf1 is mainly used as a light receiving surface on which light is incident, and the second element surface Sf2 is mainly used as a non-light receiving surface on which light is not incident.

As the second solar cell element C2, for example, a solar cell element (also referred to as a crystalline solar cell element) using a crystalline semiconductor (also referred to as a crystalline semiconductor) or a thin film semiconductor (thin film semiconductor) is used. The existing solar cell element (thin film type solar cell element) or the like can be adopted. As the crystalline semiconductor, for example, a silicon-based semiconductor such as single crystal silicon, polycrystalline silicon or a heterojunction type, or a compound-based semiconductor such as a III-V group can be adopted. Further, as the thin film semiconductor, for example, a silicon-based semiconductor, a compound-based semiconductor, or another type of semiconductor may be adopted. As the silicon-based thin-film semiconductor, for example, a semiconductor using amorphous silicon, thin-film polycrystalline silicon, or the like is applied. Examples of the compound-based thin film semiconductor include a compound semiconductor having a calcopalite structure such as a CIS semiconductor or a CIGS semiconductor, a compound semiconductor such as a compound having a perovskite structure, a compound semiconductor having a kesterite structure, or a cadmium telluride (CdTe) semiconductor. Applies.

In the examples of FIGS. 6 (a) and 6 (b), each second solar cell element C2 includes, for example, a semiconductor substrate Su2, a first extraction electrode (also referred to as a surface side bus bar electrode) EL1, and a finger electrode EL2. It has an extraction electrode (also referred to as a back surface side bus bar electrode) EL3 and a current collection electrode EL4.

For the semiconductor substrate Su2, for example, a crystalline semiconductor such as crystalline silicon, an amorphous semiconductor such as amorphous silicon, a compound semiconductor using four kinds of elements of copper, indium, gallium and selenium, and cadmium tellurium were used. Compound semiconductors and the like can be applied. Specifically, the semiconductor substrate Su2 mainly includes a region having a first conductive type and a reverse conductive type layer. The reverse conductive layer has, for example, a second conductive type that is located on the first element surface Sf1 side of the semiconductor substrate Su2 in the + Z direction and is opposite to the first conductive type of the semiconductor substrate Su2. .. For example, an insulating layer as an antireflection layer is located in a region on the reverse conductive layer where the surface side bus bar electrode EL1 and the finger electrode EL2 are not formed.

Further, regarding the combination of the first solar cell unit SL1 (first solar cell element C1) and the second solar cell unit SL2 (second solar cell element C2) of the present disclosure, for example, the first solar cell element C1 has a perovskite. When a compound semiconductor having a structure is adopted, a thin film semiconductor or a crystal semiconductor other than the compound semiconductor having a perovskite structure can be adopted for the second solar cell element C2.

The front surface side bus bar electrode EL1 and the finger electrode EL2 are located, for example, on the surface of the semiconductor substrate Su2 on the first element surface Sf1 side. In the example of FIG. 6A, two substantially parallel surface side bus bar electrodes EL1 are located on the first element surface Sf1 side, and a large number of substantially parallel finger electrodes EL2 are located on the two surface sides. It is located so as to be substantially orthogonal to the bus bar electrode EL1.

The back surface side bus bar electrode EL3 and the current collector electrode EL4 are located, for example, on the surface of the semiconductor substrate Su2 on the second element surface Sf2 side. In the example of FIG. 6B, two rows of back surface side bus bar electrodes EL3 are located on the second element surface Sf2 side along two substantially parallel virtual lines. Further, the back surface side bus bar electrode EL3 is formed except for a portion where the current collecting electrode EL4 is connected by overlapping the back surface side bus bar electrode EL3 and the current collecting electrode EL4 on the second element surface Sf2 side. It is located on almost the entire surface of the area that is not covered. Each of the two rows of backside bus bar electrodes EL3 is composed of, for example, four electrodes arranged in a row.

The wiring W2 includes, for example, the front surface side bus bar electrode EL1 of the first second solar cell element C2 and the back surface side bus bar electrode EL1 of the second second solar cell element C2 adjacent to the first second solar cell element C2. It is located in a state where it is electrically connected to EL3. As a result, for example, a plurality of second solar cell elements C2 included in the second solar cell unit SL2 may be electrically connected in series. In the examples of FIGS. 6A and 6B, the outer edge of the wiring W2 attached to each second solar cell element C2 is virtually drawn by a chain double-dashed line. The wiring W2 is, for example, a linear or strip-shaped conductive metal. As the wiring W2, for example, one in which the entire surface of a copper foil having a thickness of about 0.1 mm to 0.2 mm and a width of about 1 mm to 2 mm is covered with solder can be adopted. The wiring W2 is electrically connected to the front surface side bus bar electrode EL1 and the back surface side bus bar electrode EL3 by, for example, soldering.

As described above, for example, the second solar cell unit SL2 having the plurality of second solar cell elements C2 including the semiconductor substrate Su2 is the first solar cell unit SL1 including the first solar cell element C1 using the thin film semiconductor. Moisture resistance is higher than. On the other hand, as described above, for example, due to the presence of the third protective member PR3, it is difficult for moisture to reach the first solar cell section SL1 which has lower moisture resistance than the second solar cell section SL2. Therefore, for example, deterioration due to moisture in the first solar cell unit SL1 is unlikely to occur. As a result, for example, the reliability of the tandem type solar cell module 1 can be improved.

<1-1-7. Second encapsulant>
The second sealing material F2 is located in a region (also referred to as a second region) AR2 between the second protective member PR2 and the third protective member PR3 so as to cover the second solar cell portion SL2. The second sealing material F2 includes, for example, a front side second sealing material F2u on the front surface 1fs side and a back surface side second sealing material F2b on the back surface 1bs side.

The front side second sealing material F2u is located, for example, in a state of covering the entire surface of the second solar cell unit SL2 on the third protective member PR3 side. The back surface side second sealing material F2b is located, for example, in a state of covering the entire surface of the second solar cell unit SL2 on the second protective member PR2 side. Therefore, the second solar cell unit SL2 is positioned so as to be sandwiched between, for example, the front side second sealing material F2u and the back side second sealing material F2b. As a result, the second solar cell unit SL2 can be sealed by, for example, the second sealing material F2. In the example of FIG. 1B, the front side second sealing material F2u is located in a state of being filled between the third protective member PR3 and the second solar cell portion SL2. Further, the back surface side second sealing material F2b is located in a state of being filled between the second solar cell portion SL2 and the second protective member PR2. From another point of view, for example, the second sealing material F2 is positioned so as to be filled between the second protective member PR2 and the third protective member PR3.

Further, the second sealing material F2 has, for example, translucency. Here, for example, of the front side second sealing material F2u and the back side second sealing material F2b constituting the second sealing material F2, at least the front side second sealing material F2u has translucency. If so, the incident light from the front surface 1fs side can reach the second solar cell unit SL2. As the material of the front side second encapsulant F2u, for example, polyester resin such as EVA, TAC or PEN having excellent translucency to light of a specific range wavelength is adopted as in the case of the first encapsulant F1. Can be done. The front side second sealing material F2u may be in a state of being composed of, for example, two or more kinds of materials. Further, the material of the back surface side second sealing material F2b may be the same as the material of the front surface side second sealing material F2u, for example.

Here, as shown in FIG. 1B, for example, if the thickness T1 of the first sealing material F1 is smaller than the thickness T2 of the second sealing material F2, the first solar cell unit SL1 is used. The capacity of the covering first encapsulant F1 can be reduced. Therefore, for example, if water enters between the first protective member PR1 and the third protective member PR3, by-products such as acid generated by the reaction between the first sealing material F1 and the water are generated. It becomes difficult. For example, if EVA is applied to the first encapsulant F1, acetic acid as a by-product is generated by hydrolysis of EVA, which may cause corrosion of the first solar cell unit SL1. On the other hand, here, for example, by-products such as acid generated by the reaction between the first encapsulant F1 and water are less likely to be generated, and the first solar cell portion SL1 is less likely to deteriorate. Therefore, for example, the reliability of the tandem type solar cell module 1 can be improved.

<1-1-8. Second protective member>
The second protective member PR2 can protect, for example, the first solar cell unit SL1 and the second solar cell unit SL2 from the back surface 1bs side. In the example of FIG. 1B, the second protective member PR2 is a back sheet that constitutes the back surface 1bs. The back sheet has a thickness of, for example, about 0.3 mm to 0.5 mm. As the material of the back sheet, for example, one kind of resin among polyvinyl fluoride (PVF), polyethylene terephthalate (PET) and PEN, or at least one kind of resin of these resins is adopted. Further, in the example of FIG. 1B, the second protective member PR2 is positioned so as to wrap the second solar cell portion SL2 and the second sealing material F2 from the back surface 1bs side and the side outer peripheral portion side. There is. The second protective member PR2 is located so as to be adhered to the outer peripheral portion of the third protective member PR3.

Further, in the example of FIG. 7, the second protective member PR2 has a rectangular outer shape when viewed in a plan view from the back surface 1bs side. Further, the second protective member PR2 has, for example, the first side E2a and the second side E2b located on opposite sides along the first direction (+ X direction) in a plan view from the back surface 1bs side, and the second direction. It has a third side E2c and a fourth side E2d located on opposite sides of each other along (+ Y direction).

<1-2. Solar cell panel manufacturing method>
An example of a method for manufacturing the solar cell panel PN1 will be described with reference to FIGS. 8 (a) and 8 (b). Here, for example, the solar cell panel PN1 can be manufactured by sequentially carrying out the first step to the sixth step.

In the first step, for example, the first protective member PR1 is prepared. Here, for example, as the first protective member PR1, a flat glass plate having a rectangular front and back surface is prepared.

In the second step, for example, the first solar cell unit SL1 is arranged. Here, for example, the first solar cell unit SL1 is formed on one plate surface of the first protective member PR1. Specifically, for example, on one plate surface of the first protective member PR1, a first electrode layer 1a, a plurality of first groove portions P1 (first gap G1), a semiconductor layer 1b, a plurality of second groove portions P2, The second electrode layer 2c, the connecting portion 4, and the plurality of third groove portions P3 (second gap G2) are formed in the order described.

Here, the first electrode layer 1a can be formed, for example, by forming a metal layer on one plate surface of the first protective member PR1 by sputtering or vapor deposition. The plurality of first groove portions P1 may be formed by dividing the first electrode layer 1a by, for example, irradiating a laser. The semiconductor layer 1b can be formed by, for example, coating a raw material liquid on the first electrode layer 1a and heat treatment. The plurality of second groove portions P2 can be formed by dividing the semiconductor layer 1b by, for example, scribing. The second electrode layer 2c can be formed, for example, by sputtering or vapor deposition on the semiconductor layer 1b. In the second step, for example, the first solar cell unit SL1 formed on a thin transparent substrate may be arranged on one plate surface of the first protective member PR1. The plurality of third groove portions P3 can be formed by, for example, dividing the semiconductor layer 1b and the second electrode layer 2c by scribing or the like.

In the third step, for example, the wiring W1 is arranged with respect to the first solar cell unit SL1. Here, for example, as shown in FIGS. 3A and 3B, on the first protruding portion 1ae along one side of the first solar cell element C11 on the −Y direction side. The first wiring W1a is arranged. At this time, for example, the first wiring W1a is connected to the first protruding portion 1ae by soldering or the like. Further, for example, as shown in FIGS. 3 (a) and 3 (b), a second protrusion 1ce along one side of the seventh first solar cell element C17 on the + Y direction side. The wiring W1b is arranged. At this time, for example, the second wiring W1b is connected to the second protruding portion 1ce by soldering or the like.

In the fourth step, for example, the second solar cell unit SL2 is prepared. Here, for example, first, a plurality of second solar cell elements C2 are manufactured. Next, for example, while arranging the plurality of second solar cell elements C2 in a plane, the plurality of second solar cell elements C2 are electrically connected in series by the wiring W2. At this time, for example, the wiring W2 for extracting electricity is electrically connected to the second solar cell element C2 at the first end of the plurality of second solar cell elements C2 electrically connected in series. .. Further, at this time, for example, the wiring W2 for extracting electricity is also electrically connected to the second solar cell element C2 at the second end of the plurality of second solar cell elements C2 electrically connected in series. Be connected.

In the fifth step, for example, as shown in FIGS. 8 (a) and 8 (b), the first protective member PR1, the first sheet Sh1, the annular sheet Sc1, and the first protective member in which the first solar cell unit SL1 is formed are formed. 3 The protective member PR3, the second sheet Sh2, the second solar cell unit SL2, the third sheet Sh3, and the second protective member PR2 are laminated in the order described. As a result, the laminated body SB1 is formed. At this time, the first wiring W1a, the second wiring W1b, and the wiring W2 are arranged in a path corresponding to the connection with, for example, the terminal box or another solar cell module 1. Here, the first sheet Sh1 is, for example, a sheet made of a resin (EVA or the like) that is a base of the first sealing material F1. The annular sheet Sc1 is, for example, a sheet made of a resin (such as a butyl resin) that serves as a base for the packing portion Pk0. The second sheet Sh2 is, for example, a sheet made of a resin (EVA or the like) that is a base of the front side second sealing material F2u. The third sheet Sh3 is, for example, a sheet made of a resin (EVA or the like) that is a base of the second sealing material F2b on the back surface side. Here, for example, even if the annular sheet Sc1 is formed by directly applying the resin that has been melted or semi-melted by heating onto the annular portion along the outer edge portion of the first protective member PR1. good.

In the sixth step, for example, a laminating process is performed on the laminated body SB1 formed in the fifth step. Here, for example, a laminating device (laminator) is used to integrate the laminated body SB1. For example, in the laminator, the laminated body SB1 is placed on a heater board in the chamber, and the laminated body SB1 is heated from about 100 ° C. to about 200 ° C. while the inside of the chamber is depressurized from about 50 Pa to about 150 Pa. At this time, the first sheet Sh1, the annular sheet Sc1, the second sheet Sh2, and the third sheet Sh3 become fluid to some extent by heating. In this state, the laminated body SB1 is pressed by a diaphragm sheet or the like in the chamber, and the laminated body SB1 is integrated. As a result, the solar cell panel PN1 as shown in FIG. 1 (b) is formed.

After that, for example, a terminal box, an aluminum frame, and the like are appropriately attached to the solar cell panel PN1. At this time, for example, the first wiring W1a, the second wiring W1b, and the wiring W2 are appropriately connected to the terminals in the terminal box. Further, for example, an aluminum frame is attached to the solar cell panel PN1 along the side surface of the solar cell panel PN1. At this time, for example, a sealing material having a low moisture permeability such as a butyl resin may be filled between the side surface of the solar cell panel PN1 and the frame. As a result, the solar cell module 1 is formed.

<1-3. Summary of the first embodiment>
In the solar cell module 1 according to the first embodiment, for example, the position is located between the first protective member PR1 in the state of forming the front surface 1fs and the second protective member PR2 in the state of forming the back surface 1bs. The third protective member PR3 is located between the first solar cell unit SL1 and the second solar cell unit SL2.

Here, for example, if a relatively thin back sheet is used as the second protective member PR2, moisture easily permeates through the second protective member PR2 and the second sealing material F2 from the back surface 1bs side. On the other hand, in the solar cell module 1 according to the first embodiment, for example, between the first solar cell section SL1 and the second solar cell section SL2, the first sealing material F1 and the second sealing material F2 The third protective member PR3, which has a lower moisture permeability than the above, is located. In this case, it is difficult for the moisture that has permeated through the second protective member PR2 and the second sealing material F2 from the back surface 1bs side to reach the first solar cell unit SL1. As a result, for example, deterioration of the first solar cell unit SL1 due to moisture is unlikely to occur. As a result, for example, the reliability of the tandem type solar cell module 1 can be improved.

Further, for example, if a glass plate or the like is used as the second protective member PR2 in order to reduce the infiltration of water from the back surface 1bs side, the thickness of the second protective member PR2 is increased to some extent from the viewpoint of impact resistance and the like. There is a need to. Therefore, for example, the weight of the solar cell module may increase, and the workability when mounting the solar cell module on the installation target surface or the gantry may decrease. On the other hand, in the solar cell module 1 according to the first embodiment, for example, between the first solar cell section SL1 and the second solar cell section SL2, the first sealing material F1 and the second sealing material F2 The third protective member PR3, which has a lower moisture permeability than the above, is located. In this case, for example, the third protective member PR3 is not exposed on either the back surface 1 bs or the front surface 1 fs, and it is not necessary to increase the thickness of the third protective member PR3. Therefore, for example, while reducing the increase in weight, due to the presence of the third protective member PR3, the moisture that has permeated through the second protective member PR2 and the second sealing material F2 from the back surface 1bs side reaches the first solar cell portion SL1. It becomes difficult to reach. As a result, for example, the reliability of the tandem type solar cell module 1 can be improved while reducing the increase in weight.

<2. Other embodiments>
The present disclosure is not limited to the above-described first embodiment, and various changes and improvements can be made without departing from the gist of the present disclosure.

<2-1. Second Embodiment>
In the first embodiment, for example, as shown in FIG. 9, the solar cell module 1 according to the first embodiment is used as a basic configuration, and the second protective member PR2 is a plate-shaped second protective member having low moisture permeability. The solar cell module 1A changed to PR2A may be used. In the example of FIG. 9, the packing portion Pk1A is located along the outer peripheral portion of the second region AR2 between the third protective member PR3 and the second protective member PR2A. Thereby, for example, the moisture permeability on the back surface 1bs side of the solar cell module 1A can be reduced.

If, for example, glass or a resin such as acrylic or polycarbonate is used as the material of the second protective member PR2A, the second protective member PR2A having low moisture permeability is realized. At this time, for example, the second protective member PR2A may have translucency and high rigidity for light having a wavelength in a specific range. As the second protective member PR2A, for example, a flat plate having a thickness of several mm to 5 mm is adopted. The second protective member PR2A does not have to have translucency for light having a wavelength in a specific range, for example.

<3. Others>
In each of the above embodiments, for example, if the third protective member PR3 is not a plate-shaped member but has lower humidity and light permeability than the first sealing material F1 and the second sealing material F2. , It may be a member having a certain degree of flexibility. In this case, for example, a film having a low moisture permeability and a translucent property can be applied to the third protective member PR3.

In each of the above embodiments, for example, if the first protective member PR1 is not a plate-shaped member but has lower humidity and translucency than the first encapsulant F1 and the second encapsulant F2. , It may be a member having a certain degree of flexibility. In this case, for example, a resin sheet having low moisture permeability and having translucency may be applied to the first protective member PR1.

In each of the above embodiments, for example, a thin-film semiconductor is applied as the first solar cell element C1 and a crystalline semiconductor is applied as the second solar cell element C2. However, if the requirements of the present disclosure are satisfied, the first solar cell element C1 is applied. Alternatively, a solar cell using an organic dye and an inorganic dye may be used for the second solar cell element C2.

In each of the above embodiments, for example, when the first region AR1 between the first protective member PR1 and the third protective member PR3 is narrow, or between the solar cell panel PN1 and the frame along the outer peripheral portion of the solar cell panel PN1. When a sealing material such as butyl rubber is present between them, the packing portion Pk0 may not be present.

In the second embodiment, for example, when the second region AR2 between the third protective member PR3 and the second protective member PR2 is narrow, or the solar cell panel PN1 and the frame along the outer peripheral portion of the solar cell panel PN1. When a sealing material such as butyl rubber is present between the two, the packing portion Pk1A may not be present.

Needless to say, all or a part of each of the above-described embodiments and various modifications can be combined as appropriate and within a consistent range.

1,1A Solar cell module 1b Semiconductor layer 1b Back side 1fs Front side AR1 1st area AR2 2nd area C1 1st solar cell element C2 2nd solar cell element F1 1st sealing material F2 2nd sealing material F2b Back side 2nd Encapsulant F2u Front side 2nd encapsulant PN1 Solar cell panel PR1 1st protective member PR2, PR2A 2nd protective member PR3 3rd protective member Pk0, Pk1A Packing part SL1 1st solar cell part SL2 2nd solar cell part Su2 Semiconductor substrate

Claims (4)

The first protective member with translucency and
With the second protective member
A first solar cell unit located between the first protective member and the second protective member,
A second solar cell unit located between the first solar cell unit and the second protective member,
A third protective member located between the first solar cell section and the second solar cell section and having translucency,
A first sealing material having a translucent property, which is located in a state of covering the first solar cell portion in a first region between the first protective member and the third protective member.
A second sealing material, which is located in a second region between the second protective member and the third protective member so as to cover the second solar cell portion and has a translucent property, is provided.
The moisture permeability of the first protective member and the third protective member, rather lower than the moisture permeability of the first sealing member and said second sealing member,
A solar cell module in which the thickness of the first encapsulant is smaller than the thickness of the second encapsulant. The first protective member with translucency and
With the second protective member
A first solar cell unit located between the first protective member and the second protective member,
A second solar cell unit located between the first solar cell unit and the second protective member,
A third protective member located between the first solar cell section and the second solar cell section and having translucency,
A first sealing material having a translucent property, which is located in a state of covering the first solar cell portion in a first region between the first protective member and the third protective member.
A second sealing material, which is located in a second region between the second protective member and the third protective member so as to cover the second solar cell portion and has a translucent property, is provided.
The moisture permeability of the first protective member and the third protective member, rather lower than the moisture permeability of the first sealing member and said second sealing member,
The second solar cell unit is a solar cell module having a solar cell element having a light receiving surface located so as to face the third protective member. The solar cell module according to claim 1 or 2.
The third protective member is a solar cell module having a plate shape. The solar cell module according to any one of claims 1 to 3.
The first solar cell unit has a first solar cell element including a thin film semiconductor, and has a first solar cell element.
The second solar cell unit is a solar cell module having a second solar cell element including a semiconductor substrate.

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