WO2019053795A1 - Module de cellules solaires et son procédé de fabrication - Google Patents

Module de cellules solaires et son procédé de fabrication Download PDF

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Publication number
WO2019053795A1
WO2019053795A1 PCT/JP2017/032952 JP2017032952W WO2019053795A1 WO 2019053795 A1 WO2019053795 A1 WO 2019053795A1 JP 2017032952 W JP2017032952 W JP 2017032952W WO 2019053795 A1 WO2019053795 A1 WO 2019053795A1
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WIPO (PCT)
Prior art keywords
light receiving
receiving element
receiving elements
solar cell
cell module
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PCT/JP2017/032952
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English (en)
Japanese (ja)
Inventor
大介 新延
邦彦 西村
時岡　秀忠
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2017/032952 priority Critical patent/WO2019053795A1/fr
Priority to TW107100181A priority patent/TWI643353B/zh
Publication of WO2019053795A1 publication Critical patent/WO2019053795A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a solar cell module including a plurality of flat light receiving elements, and a method of manufacturing the same.
  • a solar cell module in which a plurality of solar cells having front electrodes on the front surface which is a light receiving surface and back electrodes on the back side are vertically and horizontally arranged, and solar cells adjacent to each other are connected by strip-shaped tab lines are known.
  • strip-like tab wires are generally provided extending between the front surface of one solar cell and the back surface of the other solar cell, and thus provided on the front surface.
  • the tab line to be covered will cover the light receiving surface of the solar cell.
  • the larger the cross-sectional area of this tab wire the smaller the resistance loss and the better the output efficiency. Therefore, if the width of the tab line is reduced and the thickness of the tab line is increased, incident light can be increased, and an increase in resistance loss can be suppressed.
  • the thickness of the tab wire is increased, the thermal stress generated due to the difference in linear expansion coefficient between the tab wire and the solar cell may increase at the time of solder connection, and cell breakage may occur.
  • the thickness of the tab wire is large, in the laminating step of sealing the solar cell using a resin or the like, there is a possibility that the tab wire portion becomes a starting point to cause a crack, warpage of the solar cell, or a crack of the cell The possibility of peeling of the electrode or the like increases. Since there is a limit to increasing the thickness of the tab line in this way, although there is a conflict between the resistance and the shadow area with respect to the width of the tab line, generally the tab line is It is formed to have an elongated strip shape.
  • Patent Document 1 filed by the same applicant as the present application discloses a solar cell module in which a tab wire is biased to both ends of the front surface and both ends of the back surface. According to such a configuration, since a part of the tab electrode can be extended outside the both ends of the solar cell element, even a thin tab electrode can expand the width and enlarge the cross-sectional area. It is possible to reduce the internal resistance of the
  • Patent Document 2 proposes a technique in which a plurality of rectangular solar cell elements are arranged in the longitudinal direction and connected in series by tab wires.
  • Patent Document 2 reduces the current by halving the size of the solar cell element, the conflicting relationship still exists between the tab wire resistance and the tab wire shadow area, so the tab wire There is room for improvement in the resistance and shadow area of the
  • this invention is made in view of the above problems, and it aims at providing the technique which can improve the characteristic of a solar cell module.
  • the first, second and third light-receiving elements in the form of a flat plate spaced apart from each other and arranged in a plane, and the first, second and third light-receiving elements are electrically And a strip-like first tab line connected to Each of the first, second and third light receiving elements is provided on a front surface electrode provided at an end of the front surface of the light receiving element, and on a back surface of the end of the light receiving element. And a back electrode.
  • the first tab line connects the front electrodes of the first and second light receiving elements or the back electrodes of the first and second light receiving elements in a state where the end portions of the first and second light receiving elements are opposed to each other.
  • the first tab line connects the first and second light receiving elements in parallel by connecting the front surface electrodes of the first and second light receiving elements, or connecting the back surface electrodes of the first and second light receiving elements.
  • the first or second light receiving element and the third light receiving element are connected in series by extending from the back surface electrode and connecting with the back surface electrode or the front surface electrode of the third light receiving element. According to such a configuration, the characteristics of the solar cell module can be enhanced.
  • FIG. 2 is a cross-sectional view showing a configuration of a parallel light receiving element provided in the solar cell module according to Embodiment 1.
  • FIG. 2 is a cross-sectional view showing a configuration of a parallel light receiving element provided in the solar cell module according to Embodiment 1.
  • FIG. 2 is a cross-sectional view showing a configuration of a parallel light receiving element provided in the solar cell module according to Embodiment 1.
  • FIG. 2 is a cross-sectional view showing a configuration of a parallel light receiving element provided in the solar cell module according to Embodiment 1.
  • FIG. 2 is a cross-sectional view showing a configuration of a parallel light receiving element provided in the solar cell module according to Embodiment 1.
  • FIG. 2 is a plan view showing a configuration of a semiconductor substrate to be a plurality of light receiving elements according to Embodiment 1 viewed from the front surface side.
  • FIG. 5 is a plan view showing a configuration in which semiconductor substrates to be a plurality of light receiving elements according to Embodiment 1 are viewed from the back surface side.
  • It is sectional drawing which shows the structure of the parallel light reception element with which the solar cell module which concerns on the modification 1 is equipped. It is sectional drawing which shows another structure of the parallel light reception element with which the solar cell module which concerns on the modification 1 is equipped.
  • It is a top view which shows the structure which looked at the some light receiving element with which the solar cell module which concerns on the modification 2 is equipped from the back surface side.
  • FIG. 1 is a plan view of a part of two strings provided in the solar cell module according to the first embodiment as viewed from the front surface side which is a light receiving surface
  • FIG. 2 is a plan view of the two strings. It is the top view which looked at a part from the back side.
  • Each string 110 of the solar cell module includes parallel light receiving elements 100a to 100c.
  • the parallel light receiving elements 100a to 100c basically have the same structure. Therefore, hereinafter, when the parallel light receiving elements 100a, 100b, and 100c are not distinguished from one another, they may be described as the parallel light receiving element 100.
  • the number of parallel light receiving elements 100 can be arbitrarily changed.
  • Each parallel light receiving element 100 includes a plurality of light receiving elements to be described later and a plurality of strip-shaped tab lines 10 electrically connecting the plurality of light receiving elements.
  • the parallel light receiving element 100 is simplified and schematically shown in FIGS. 1 and 2.
  • the tab line 10 is a strip-like conductor having a length about twice that of the light receiving element 1 and extends in the Y direction in FIGS. 1 and 2.
  • the tab wire 10 has a front surface side tab wire portion 11 shown in FIG. 1 and a back surface side tab wire portion 13 shown in FIG.
  • the surface side tab wire part 11 and the back surface side tab wire part 13 may be comprised from one member which is not isolate
  • each string 110 the parallel light receiving element 100a and the parallel light receiving element 100b adjacent in the Y direction are connected in series by the tab line 10, and the parallel light receiving element 100b and the parallel light receiving element 100c adjacent in the Y direction are different tab lines 10 Are connected in series.
  • one string 110 including a plurality of parallel light receiving elements 100 in one row is configured.
  • a peripheral conductor such as a copper wire disposed along the side of the module is one end of the tab wire 10 of the adjacent string 110. Used for interconnection. Thereby, the plurality of strings 110 are connected in series to each other by the peripheral wires. Further, although not shown, one end of a lead wire, which is a lead wire for extracting power and current to the outside of the solar cell module, is connected to a peripheral wire which is an end in series connection of a plurality of strings 110 The other end of the line is taken out of the module. Furthermore, although not shown, in order to improve the weather resistance of the parallel light receiving element 100, the plurality of strings 110 may be covered by a sealing member such as an ethylene vinyl acetate resin sheet.
  • the back side of the plurality of strings 110 may be covered by a back sheet such as a weather resistant polyethylene terephthalate resin sheet or glass together with the sealing member, and the light receiving surface side of the plurality of strings 110 is sealed It may be covered by translucent members, such as glass, with a member, for example.
  • a frame, a junction box, and a module main surface material and the like used for the front and back surfaces of the solar cell module are disposed.
  • illustration is abbreviate
  • interposed by the surface side main surface material and the back surface side main surface material is supported by the flame
  • the solar cell module is configured by being drawn to the back surface from between the sealing material and the cut of the back surface side main surface material.
  • FIG. 3 is a plan view of the light receiving elements 1a to 1e included in the parallel light receiving element 100 according to the first embodiment viewed from the front surface side
  • FIG. 4 is a plan view of the light receiving elements 1a to 1e. It is the top view seen from the back side.
  • illustration of the tab line 10 is abbreviate
  • the light receiving elements 1a to 1e basically have the same structure. Therefore, hereinafter, when the light receiving elements 1a to 1e are not distinguished from one another, each may be described as the light receiving element 1.
  • the number of light receiving elements 1 can be arbitrarily changed.
  • the light receiving elements 1a to 1e included in the parallel light receiving element 100 correspond to solar cells or solar cell elements.
  • the solar cell module according to the first embodiment can also be called a light receiving element module.
  • light receiving elements formed from a semiconductor substrate such as a silicon substrate are assumed as the light receiving elements 1a to 1e, the present invention is of course not limited thereto.
  • the light receiving elements 1a to 1e on the flat plate which are the smallest units in the module, are arrayed in a plane, separated from each other.
  • the light receiving elements 1a to 1e extending in the Y direction are such that the long sides of two adjacent light receiving elements 1 are opposed to each other in the X direction different from the Y direction in the sealing member not shown.
  • the light receiving elements 1b to 1e are disposed with respect to the light receiving element 1a in the adjacent direction in which the light receiving element 1a and the light receiving element 1b are adjacent to each other.
  • the X direction in which the plurality of light receiving elements 1 included in one parallel light receiving element 100 are adjacent may or may not be orthogonal to the Y direction in which the tab line 10 in FIG. 1 extends. It is also good.
  • the first light receiving element according to the present invention can be referred to as light receiving element 1a
  • the plurality of second light receiving elements according to the present invention can be referred to as light receiving elements 1b to 1e.
  • the short width (W) of the light receiving elements 1a and 1e located at both ends is the short width (2 W) of the other light receiving elements 1b to 1d. It is half of the According to such a configuration, the effective current collection distances of the device electrodes of the respective light receiving devices 1 can be made the same.
  • Each light receiving element 1 is a surface electrode which is an element electrode disposed at the end of the front surface of the light receiving element 1 and an element electrode disposed at the back of the end of the light receiving element 1. And a back electrode.
  • the light receiving element 1 When sunlight is incident on the light receiving surface of the light receiving element 1 through the transparent glass, the light receiving element 1 performs photoelectric conversion for converting sunlight into electric power. Then, the power converted by the light receiving element 1 is taken out from the front surface electrode and the back surface electrode of the light receiving element 1. Next, the front and back electrodes will be described in detail.
  • the light receiving element 1 has a surface grid electrode 4 and a surface bus electrode 5 as surface electrodes.
  • the surface grid electrode 4 and the surface bus electrode 5 are formed, for example, by applying a silver paste containing Ag (silver) as a main component and performing heat treatment.
  • the surface bus electrode 5 is disposed along the end of the front surface of the light receiving element 1 and, in the first embodiment, extends along the edge of the solar cell parallel to the Y direction. ing.
  • the end of the front surface of the light receiving element 1 includes the end of the light receiving element 1 and an inner portion inside the end of the light receiving element 1, and the surface bus electrode 5 is the inner side. It is arranged in the part. That is, in the first embodiment, the surface bus electrode 5 is disposed slightly inside the X-direction end of the light receiving element 1. In the description of the first embodiment, the side closer to the center of the light receiving element 1 is referred to as the inside, and the far side is referred to as the outside.
  • the plurality of surface grid electrodes 4 are arranged on the front surface of the light receiving element 1 at appropriate intervals along the Y direction so that the portion covering the front surface is reduced.
  • the end portion of each surface grid electrode 4 in the X direction is connected to the surface bus electrode 5.
  • Such a surface grid electrode 4 is an electrode called a fine line electrode or a finger electrode, and is an electrode which collects a current generated in the plane of the light receiving element 1 which is a solar cell and leads it to the surface bus electrode 5. is there.
  • the surface bus electrode 5 connected to the surface grid electrode 4 functions as a current extraction electrode for extracting the current collected by the surface grid electrode 4 to the outside of the light receiving element 1 through the tab wire 10.
  • the surface grid electrode 4 in which thin lines are arranged in parallel as shown in FIG. 3 is not essential to the present invention, and instead of the surface grid electrode 4, for example, an electrode of dendritic pattern or a transparent electrode made of a transparent conductive film is used. Alternatively, an electrode in which the surface grid electrode 4 and the transparent electrode are combined may be used. In order to simplify the drawing, the number of the surface grid electrodes 4 is shown in FIG.
  • the light receiving element 1 has a back surface aluminum electrode 6 and a back surface silver electrode 7 as the back surface electrode.
  • the back surface aluminum electrode 6 is formed by applying a material containing Al (aluminum) as a main component or an aluminum paste, and the back surface silver electrode 7 by applying a silver paste and heat treating them.
  • the back surface silver electrodes 7 are disposed at the end of the back surface of the light receiving element 1, and in the first embodiment, a plurality of the back surface silver electrodes 7 are arranged along the edge of the solar cell parallel to the Y direction. More specifically, the back surface silver electrode 7 is disposed in contact with the end of the light receiving element 1 in the X direction.
  • the back surface silver electrode 7 functions as an electrode for extracting the current collected by the back surface aluminum electrode 6 to the outside of the light receiving element 1 through the tab wire 10. In order to simplify the drawing, the back surface silver electrodes 7 are illustrated in a smaller number in FIG.
  • the back surface aluminum electrode 6 is formed so as to cover the peripheral portion of the light receiving element 1 and substantially the entire back surface except the back surface silver electrode 7.
  • FIG. 5 is a plan view of parallel light receiving elements 100b and 100c adjacent in the Y direction from one string 110 of FIG. 1 and viewed from the front side.
  • the tab line 10 included in the parallel light receiving element 100b is illustrated in FIG. 5 for simplification of the drawing, the illustration of the other tab line 10 is omitted.
  • FIG. 6 is a plan view showing that the parallel light receiving element 100c of the parallel light receiving elements 100b and 100c of FIG. 5 is transmitted. That is, although the front surface electrodes of the parallel light receiving elements 100b and 100c are illustrated in FIG. 5, the front surface electrodes of the parallel light receiving elements 100b and the back surface electrodes of the parallel light receiving elements 100c are shown in FIG. Is illustrated. 5 and 6 show that the tab line 10 located on the front side of the parallel light receiving element 100b is transmitted.
  • the plurality of tab lines 10 may be described as tab lines 10a to 10d.
  • FIG. 7 is a cross-sectional view showing the configuration of the parallel light receiving element 100b, and more specifically, a cross-sectional view taken along line A-A 'of FIG.
  • the tab line 10a is provided with the end portion provided with the surface bus electrode 5 of the light receiving element 1a and the surface bus electrode 5 with the light receiving element 1b.
  • the light receiving element 1a and the light receiving element 1b are connected in parallel.
  • the tab line 10a is disposed across the gap between the end portions of the light receiving element 1a and the light receiving element 1b. Therefore, a part of the tab line 10a in the width direction is an end of the light receiving element 1 in the X direction. It protrudes outside from the side.
  • the tab line 10b opposes the end of the light receiving element 1b on which the surface bus electrode 5 is provided and the end of the light receiving element 1c on which the surface bus electrode 5 is provided.
  • the light receiving element 1b and the light receiving element 1c are connected in parallel by connecting the surface bus electrode 5 of the light receiving element 1b and the surface bus electrode 5 of the light receiving element 1c in the state where the light receiving element 1b is made.
  • the tab line 10b is disposed across the gap between the end portions of the light receiving element 1b and the light receiving element 1c. Therefore, a part of the tab line 10b in the width direction is an end of the light receiving element 1 in the X direction. It protrudes outside from the side.
  • the tab line 10c connects adjacent light receiving elements 1c and 1d in parallel
  • the tab line 10d connects adjacent light receiving elements 1d and 1e in parallel. Therefore, the first tab line according to the present invention can be called a tab line 10a, and the plurality of third tab lines according to the present invention can be called each tab line 10b to 10d.
  • a plurality of parallel light receiving elements 100 including the light receiving elements 1a to 1e and the tab lines 10a to 10d as described above are arranged in the Y direction in which the tab lines 10a to 10d extend. ing. Therefore, the unit structure according to the present invention can be called a parallel light receiving element 100.
  • FIG. 8 is a cross-sectional view showing the configuration of parallel light receiving elements 100b and 100c. Specifically, it passes through surface bus electrode 5, back aluminum electrode 6 and back silver electrode 7 without passing through surface grid electrode 4 of FIG.
  • FIG. 5 is a cross-sectional view taken along the line BB ′.
  • FIG. 9 is a cross-sectional view showing the configuration of the parallel light receiving elements 100b and 100c, and more specifically, a cross-sectional view taken along line C-C 'of FIG. Note that FIG. 8 shows an example of the incident direction S of sunlight incident on the light receiving element 1.
  • the tab line 10a of the parallel light receiving element 100b connects the light receiving elements 1a and 1b in parallel by connecting the surface bus electrodes 5 of the light receiving elements 1a and 1b of the parallel light receiving element 100b.
  • the tab line 10a of the parallel light receiving element 100b extends from the front surface bus electrode 5 and is connected to the back surface silver electrode 7 of the light receiving elements 1a and 1b of the parallel light receiving element 100c.
  • the light receiving element 1a or the light receiving element 1b of the parallel light receiving element 100b and the light receiving element 1a or the light receiving element 1b of the parallel light receiving element 100c are connected in series.
  • the first unit structure according to the present invention can be called a parallel light receiving element 100b
  • the second unit structure according to the present invention can be called a parallel light receiving element 100c.
  • the three light receiving elements can be called the light receiving element 1a or the light receiving element 1b of the parallel light receiving element 100c.
  • the tab line 10a of the parallel light receiving element 100b also connects the back surface silver electrodes 7 of the light receiving elements 1a and 1b of the parallel light receiving element 100c in parallel.
  • the light receiving elements 1a and 1b of the parallel light receiving element 100b are connected in parallel with each other by the tab line 10a of the parallel light receiving element 100b, and the light receiving elements 1a and 1b of the parallel light receiving element 100c are connected in parallel with each other
  • the light receiving elements 1a and 1b of the parallel light receiving element 100b and the light receiving elements 1a and 1b of the parallel light receiving element 100c are connected in series.
  • the tab line 10b of the parallel light receiving element 100b is an adjacent light receiving element 1b by connecting the surface bus electrodes 5 of the adjacent light receiving elements 1b and 1c of the parallel light receiving element 100b. , 1c are connected in parallel.
  • the tab line 10b of the parallel light receiving element 100b extends from the front surface bus electrode 5 and is connected in parallel to the back surface silver electrode 7 of the adjacent light receiving elements 1b and 1c of the parallel light receiving element 100c.
  • the light receiving element 1b or the light receiving element 1c of the light receiving element 100b and the light receiving element 1b or the light receiving element 1c of the parallel light receiving element 100c are connected in series.
  • the tab lines 10c and 10d are also connected in series similar to the tab lines 10a and 10b.
  • the tab line 10a of the parallel light receiving element 100b that is, the front side tab line portion 11 of the upper tab line 10a in FIG. 7, connects the front surface bus electrodes 5 of the light receiving elements 1a and 1b of the parallel light receiving element 100b.
  • the tab line 10a of the parallel light receiving element 100a that is, the back side tab line portion 13 of the tab line 10a on the lower side of FIG. 7, connects the back silver electrodes 7 of the light receiving elements 1a and 1b of the parallel light receiving element 100b.
  • the lower tab line 10a in FIG. 7 connects the back surface silver electrodes 7 of the light receiving elements 1a and 1b of the parallel light receiving element 100b, and extends from the back surface silver electrode 7 to be a parallel light receiving element
  • the light receiving element 1a or the light receiving element 1b of the parallel light receiving element 100b and the light receiving element 1a or the light receiving element 1b of the parallel light receiving element 100a are connected in series by connecting with the surface bus electrodes 5 of the light receiving elements 1a and 1b 100a.
  • the lower tab wire 10a of FIG. 7 is also disposed across the gap between the light receiving element 1a and the end of the light receiving element 1b.
  • the light receiving elements 1a and 1b of the parallel light receiving element 100a are arranged on the opposite side of the light receiving elements 1a and 1b of the parallel light receiving element 100c with respect to the light receiving elements 1a and 1b of the parallel light receiving element 100b.
  • the fourth light receiving element according to the present invention can be called the light receiving elements 1a and 1b of the parallel light receiving element 100a.
  • the second tab line according to the present invention can be referred to as the tab line 10a of the parallel light receiving element 100a, that is, the tab line 10a on the lower side of FIG.
  • the surface bus electrode 5 of the parallel light receiving element 100b and the back surface of the parallel light receiving element 100c As shown in FIGS. 7 and 8, between the back surface side tab wire portion 13 of the tab wire 10 and the front surface side tab wire portion 11, the surface bus electrode 5 of the parallel light receiving element 100b and the back surface of the parallel light receiving element 100c. A height difference occurs in the thickness direction Z of the light receiving element 1 with the silver electrode 7. Since the front surface bus electrode 5 and the back surface silver electrode 7 are thinner than the thickness of the light receiving element 1, this height difference is mainly due to the thickness of the light receiving element 1.
  • a gap of the same degree as the difference that is, a gap of the same degree as the thickness of the light receiving element 1 is generated.
  • a gap of the same degree as the thickness of the light receiving element 1 is generated.
  • about 2 to 10 mm is assumed as the gap.
  • a sealing resin, an insulating material or the like of the module may be disposed in this gap, or may remain as a void.
  • the tab wire 10 connects the front surface electrodes of the adjacent light receiving elements 1 or the back surface electrodes in parallel, and the front surface electrode or the front electrode It extends from the back surface electrode and is connected to the other light receiving elements 1. That is, each tab line 10 is connected in parallel so as to bridge the front surface bus electrodes 5 of the light receiving surface of the light receiving element 1 adjacent to each other in the X direction or the back surface silver electrodes 7 of the rear surface. As a result, a part of the tab line 10 in the width direction protrudes outward from the edge of the light receiving element 1 extending in the Y direction.
  • the tab line 10 since the tab line 10 has a portion protruding from the light receiving element 1 when viewed from the light incident direction, the shadow area formed on the light receiving element 1 by the tab line 10 should be reduced by the protruding amount. Can.
  • the conductive resistance of the tab wire 10 can be reduced by enlarging the protruding portion of the tab wire 10 to a certain extent. As described above, the conversion efficiency of the solar cell can be enhanced, and the light receiving area of the light receiving element 1 can be increased, whereby the conductive resistance of the tab wire 10 can be reduced.
  • the resistance often becomes higher than the back surface silver electrode 7. Therefore, in the prior art, there is a problem that the current generated by the photovoltaic generation is significantly attenuated while flowing in the entire back surface. Further, not only the back surface aluminum electrode 6 but also a thin metal film, a transparent conductive film or the like as the back surface electrode causes the same problem. In particular, in the prior art, the front and back electrodes are disposed over a relatively long distance from the tab line at one end of the light receiving element to the tab line at the other end.
  • the plurality of tab lines 10 can be disposed at relatively short intervals on the light receiving surface or the back surface of the light receiving element 1. The distance from any position to the tab line 10 can be approximately reduced. For this reason, current collection resistance can be reduced.
  • the conductive resistance of the tab line 10 can be substantially reduced.
  • the surface electrode includes the surface bus electrode 5 disposed along the end of the light receiving element 1, and the tab wire 10 connects the surface bus electrodes 5 to each other. According to such a configuration, it is possible to increase the photoelectric conversion efficiency of the light receiving element 1 and the solar cell module. The reason for this will be described at the end of the first embodiment.
  • the light receiving element 1 holds the state in which the upper tab line 10 in FIG. 7 and the lower tab line 10 in FIG. 7 are separated. Therefore, when the upper tab line 10 in FIG. 7 and the lower tab line 10 in FIG. 7 are viewed from the light incident direction, even if the tab lines 10 are arranged to overlap with each other, these tab lines 10 It is possible to suppress short circuit between each other.
  • the plurality of tab lines 10 can be disposed at relatively short intervals, so the distance from any position on the light receiving surface and the back surface to the tab line 10 It can be roughly reduced. For this reason, current collection resistance can be reduced.
  • the surface bus electrode 5 is disposed inside the end of the light receiving element 1.
  • the distance between the surface bus electrode 5 and the back surface silver electrode 7 along the substrate surface of the light receiving element 1, that is, along the substrate surface of the light receiving element 1 between the surface bus electrode 5 and the back surface silver electrode 7 The distance can be increased. Therefore, a bonding member such as solder connecting the front surface side tab wire portion 11 and the front surface bus electrode 5 and a bonding member such as solder connecting the rear surface side tab wire portion 13 and the rear surface silver electrode 7 can be short circuited Can be reduced.
  • the back surface silver electrode 7 may be disposed inside the end of the light receiving element 1 as in the modification described later.
  • the magnitudes of the currents of the respective light receiving elements 1 do not have to be the same. Therefore, as shown in FIGS. 3 and 4, the light receiving area of at least one of the light receiving elements 1a to 1e may be different from the light receiving area of the other light receiving element. As a result, the design freedom of the parallel light receiving element 100 can be increased.
  • the light receiving elements 1a to 1e may be formed by dividing one semiconductor substrate.
  • FIG. 10 is a plan view of the semiconductor substrate 120 before cutting, which is the base of the light receiving elements 1a to 1e of the first embodiment, viewed from the front surface side, and FIG. It is the top view seen from the back side.
  • the light receiving elements 1a to 1e are formed by dividing one semiconductor substrate 120.
  • a single semiconductor substrate 120 a single crystal silicon solar substrate having a front electrode and a back electrode described above on a single crystal silicon substrate which is a semiconductor wafer obtained by slicing a cylindrical single crystal ingot having a diameter of about 200 mm.
  • a substrate provided with a battery can be used.
  • the semiconductor substrate 120 for example, a flat substrate having a thickness of 0.1 to 0.4 mm having corner crop with arcs at four corners and a pseudo-square having a size of 100 to 156 mm may be used. it can.
  • five light receiving elements 1 are formed by cutting such a semiconductor substrate 120 between the front surface bus electrodes 5 of FIG. 10 and the back surface silver electrode 7 of FIG. 11 using a laser or the like. Do.
  • the parallel light receiving element which is one unit in the extending direction of the string 110 is measured by measuring the power generation characteristics and the like of one light receiving device formed on one semiconductor substrate 120 before division. Power generation characteristics such as short circuit current density can be predicted for 100. For this reason, since it is not necessary to measure the power generation characteristics of the plurality of light receiving elements 1 after division one by one, it is possible to reduce the effort of the characteristic evaluation.
  • the string 110 in FIG. 1 is not necessarily formed by serially connecting a plurality of light receiving elements 1 connected in parallel, and for example, formed by connecting a plurality of light receiving elements 1 connected in series in parallel May be
  • the tab wire 10 shown in FIG. 1 is, for example, stamped out a strip-like copper foil having a thickness of 0.01 to 0.5 mm, preferably 0.08 to 0.5 mm, and a width of 0.5 to 20 mm. It forms by performing solder plating which consists of silver and tin on both surfaces of the copper foil concerned.
  • solder plating which consists of silver and tin on both surfaces of the copper foil concerned.
  • the light receiving element 1 is heated to a temperature close to 300 ° C. to melt the silver tin plating plated on the copper foil of the tab wire 10, thereby the tab wire 10 and the front and back electrodes And can be connected.
  • the dissolution of plating may be performed by spot heating.
  • the tab wire 10 is not necessarily a member plated with silver and tin, and may be, for example, a tin-plated copper wire that does not contain silver. Moreover, the tab wire 10 may use the member by which plating is not given to the surface. In this case, for example, the tab wire 10 may be connected to the front electrode and the back electrode by a solder, a conductive adhesive, a conductive polymer, a conductive tape, welding, pressure bonding, or the like having a composition other than the above composition. . When the tab wire 10 and the back surface silver electrode 7 are connected by solder, the back surface silver electrode 7 is preferably made of a metal material mainly containing Ag.
  • the solder is applied only to the portion where the tab wire 10 and the front surface bus electrode 5 and the back surface silver electrode 7 are connected.
  • the solder may be provided so as to cover the whole of the front and back surfaces of the tab wire 10.
  • the tab line 10 may be connected to the surface bus electrode 5 over the entire length of the surface bus electrode 5 or may be partially connected to the surface bus electrode 5.
  • the pair of symmetrical tab lines 10 is extended in the Y direction and disposed at both ends of the light receiving element 1.
  • the same effect can be obtained by providing only at one end.
  • the extending direction of the tab line 10 and the extending direction of the string 110 do not have to be parallel to each other, and are slightly adjusted in accordance with the shape of the light receiving element 1, that is, the solar cell and the arrangement interval between the light receiving elements 1 May be
  • the back surface side tab line portion 13 of the tab line 10 does not necessarily have to be parallel to the edge of the light receiving element 1 and may be inclined at 0 to 20 degrees with respect to the edge.
  • an electrode pattern having a width of about 0.05 to 0.2 mm and extending in a predetermined direction has a predetermined period of 0.5 to 2.5 mm and It is arranged in the orthogonal direction.
  • the surface bus electrode 5 and the tab line 10 are formed, for example, to extend on the light receiving element 1 in the direction orthogonal to the surface grid electrode 4.
  • the surface bus electrode 5 is connected to the tab wire 10, it is often thicker than the surface grid electrode 4 and often has a width of, for example, about 0.1 mm to several mm.
  • the tab wire 10 and all the surface grid electrodes 4 may be electrically connected, and the surface bus electrode 5 does not necessarily have to be provided. Even when the surface bus electrode 5 is provided, the surface bus electrode 5 does not necessarily have to be a continuous electrode, and furthermore, does not have to be a thicker electrode than the surface grid electrode 4.
  • the back surface aluminum electrode 6 containing Al as a main component covers substantially the entire back surface of the light receiving element 1.
  • the invention is not limited to this, and instead of the back surface aluminum electrode 6, a metal electrode containing Ag as a main component may be used.
  • the tab wire 10 can be directly connected to the back surface aluminum electrode 6, so the back surface silver electrode 7 need to be disposed. Absent.
  • an electrode made of a material other than silver may be used.
  • a metal electrode formed in a partial region of the back surface may be used similarly to the front surface grid electrode 4 and the front surface bus electrode 5, or transparent formed on substantially the entire surface of the metal electrode and the back surface.
  • An electrode combined with a conductive electrode may be used.
  • the back surface of the light receiving element 1 can also be used as the light receiving surface, the light receiving element 1 can be used as a double-sided light receiving element. In the configuration, it is desirable that the width and the separation of the back electrode be different from the width and the separation of the surface electrode.
  • the planar shapes of the light receiving surface as the front surface and the non-light receiving surface as the back surface are substantially rectangular, and the thickness is, for example, 0.1 to 0.
  • a semiconductor substrate having a thin plate-like pn junction of 0.5 mm is used.
  • the shape of the semiconductor substrate 120 shown in FIG. 10 and FIG. 11 is a shape in which a part of a square corner is cut off, it is not limited thereto, for example, a part of a rectangular corner is cut off It may be of any shape.
  • a crystalline silicon light receiving element having a pn junction, a gallium arsenide light receiving element, or the like can be used as the light receiving element 1 formed by dividing the semiconductor substrate 120 and the semiconductor substrate 120.
  • the pn junction may be formed by impurity diffusion or may be a heterojunction such as amorphous silicon.
  • the same manufacturing method as that disclosed in JP 2013-021172 A can be used.
  • the current extraction electrode is provided in the area on the back side of the surface bus electrode which is an area where power is not generated so much by blocking light by the surface bus electrode. Thereby, it is possible to reduce the efficiency loss by the current extraction electrode.
  • a configuration has been proposed in which two tab lines disposed at both ends of the light receiving element are disposed to protrude from both ends of the light receiving element.
  • the tab wire connecting the light receiving surface side and the back surface side is bent at the light receiving element between, so that the connection point between the light receiving element and the tab wire does not overlap on the light receiving surface side and the back surface side I have to.
  • the tab wire on the back side can only be connected to a local portion of the light receiving element. Therefore, the length of the back electrode whose resistance is larger than that of the tab wire, that is, the current collection distance through which the current generated by the light receiving element passes until it is collected by the tab wire, becomes relatively large.
  • the length of the back surface electrode is increased. As a result, the influence of the increase of the current collection distance in the X direction which is the width direction of the string 110 becomes apparent.
  • the current collecting distance at the element electrode that is, the distance between the tab line and the tab line in the X direction is about 38 mm. It becomes.
  • the current collection distance at the element electrode is 70 mm or more.
  • the increase of the current collection distance in such an element electrode and hence the increase of the current collection resistance is a result even if the gain is enhanced by the reduction of the shadowed area by arranging the tab wires at both ends of the light receiving element. It sometimes reduced the characteristics of the module.
  • Such an increase in current collection resistance occurs not only in the back surface electrode but also in the front surface electrode. In particular, the surface electrode is often formed to be thin, so that the deterioration in characteristics becomes more remarkable than in the back surface electrode.
  • the light receiving area of the light receiving element 1 is increased, the conductive resistance of the tab wire 10 is reduced, and the current collecting resistance is reduced. Can.
  • the tab wire extends in the direction of extension of the string 110 in order to reduce the current collection resistance in the plane of the light receiving element.
  • the light receiving element is disposed so as to be substantially longitudinally cut from one end to the other end.
  • the tab lines on the light receiving surface are disposed at both ends, and the both tab lines are both arranged to longitudinally cut the light receiving element in order to reduce current collection resistance in the surface of the light receiving element.
  • the tab line on the light receiving surface side and the tab line on the back surface side are disposed at different positions in plan view.
  • a light receiving element whose back surface is passivated there are a configuration in which the material of the current collection electrode and the material of the current extraction electrode are the same and the patterns are different, and a configuration in which the current collection electrode and the current extraction electrode are integrated.
  • the current collection electrode and the current extraction electrode are preferably provided below the bus electrode on the front surface side, which is an area where power is not generated very much.
  • the back surface silver electrode 7 which is a current extraction electrode is disposed in a portion to be shaded of the front surface bus electrode 5.
  • the resistance loss due to the back surface silver electrode 7 can be reduced, and the power generation efficiency of the light receiving element 1 and the solar cell module can be enhanced compared to the prior art.
  • FIG. 12 is a cross-sectional view showing the configuration of the parallel light receiving element 100b according to the first modification, and more specifically, a cross-sectional view taken along the line AA 'of FIG.
  • the insulating member 14 is added, and the insulating member 14 is disposed in at least a part of the gap between the upper tab wire 10 of FIG. 12 and the lower tab wire 10 of FIG. It is done.
  • the insulation between the upper and lower tab lines 10 can be enhanced.
  • the insulating member 14 may be disposed in the middle of the upper and lower tab wires 10 as shown in FIG. 12 or may be disposed in proximity to the upper tab wire 10 as shown in FIG. Although not shown, it may be disposed close to the lower tab wire 10.
  • FIG. 14 is a plan view of the light receiving elements 1a to 1e according to the second modification as viewed from the back side as in FIG. Unlike the configuration according to the first embodiment shown in FIG. 4, the back surface silver electrode 7 according to the present modification 2 is disposed at the inner side inside the end of the light receiving element 1 like the surface bus electrode 5. ing. According to such a configuration, the distance between the front surface bus electrode 5 and the rear surface silver electrode 7 along the substrate surface of the light receiving element 1 can be increased.
  • a bonding member such as solder connecting the front surface side tab wire portion 11 and the front surface bus electrode 5 and a bonding member such as solder connecting the rear surface side tab wire portion 13 and the rear surface silver electrode 7 can be short circuited
  • the conductivity can be reduced and the insulation can be enhanced.
  • FIG. 15 is a cross-sectional view showing the configuration of the parallel light receiving element 100b according to the third modification, and more specifically, a cross-sectional view taken along the line AA 'in FIG.
  • the insulating member 14 described in the first modification is also added, but the insulating member 14 may not be added.
  • the light guiding member 15 is added, and the light guiding member 15 is disposed on the surface of the portion of the tab wire 10 connected to the surface electrode opposite to the surface connected to the surface electrode. It is done.
  • the light guide member 15 includes, for example, a light reflector or a light scatterer. According to such a configuration, the light directed to the tab line 10 can be guided to the light receiving surface of the light receiving element 1 by the light guide member 15. This can further enhance the power generation efficiency.
  • ⁇ Modification 4> 16 and 17 are a plan view of the parallel light receiving elements 100b and 100c according to the fourth modification viewed from the front side and a plan view from the back side, and one string 110 to Y of FIG. It corresponds to the extraction of the parallel light receiving elements 100b and 100c adjacent in the direction.
  • the tab lines 10 included in the parallel light receiving element 100b are illustrated in FIG. 16 for simplification of the drawing, the other tab lines 10 are not illustrated.
  • the width W1 of the portion of the tab line 10 connected to the front surface electrode of the light receiving elements 1a to 1e is narrower than the width W2 of the portion connected to the back surface electrode of the light receiving elements 1a to 1e.
  • the portion of the tab wire 10 connected to the surface side blocks light incident on the light receiving element, so the narrower the width of the tab wire 10, the higher the power generation efficiency.
  • the width of the tab line 10 on the back side is narrowed as well as the width of the tab line 10 on the front side, the connection area of the tab line 10 and the silver electrode 7 on the back side narrows, and the light receiving elements 1a to 1e and the tab line 10 The connection strength with is reduced.
  • connection strength causes a reduction in the yield rate when producing strings and long-term reliability of the solar cell module. Therefore, in the fourth modification, the width W2 of the portion of the tab wire 10 connected to the back surface side is increased. As a result, the connection area between the tab wire 10 and the back surface silver electrode 7 can be increased, and the connection strength between the light receiving elements 1a to 1e and the tab wire 10 can be kept high.
  • the portion of the tab wire 10 connected to the back surface side does not block the light incident on the light receiving elements 1a to 1e, so that the power generation efficiency does not decrease, and the connection area between the tab wire 10 and the back surface silver electrode 7 is wide. Therefore, the contact resistance between the tab wire 10 and the back surface silver electrode 7 can be reduced.
  • the embodiment can be appropriately modified or omitted.

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  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

Le but de la présente invention est de fournir une technique qui est capable d'améliorer les caractéristiques d'un module de cellules solaires. Ce module de cellules solaires comprend : des premier, second et troisième éléments de réception de lumière ; et un premier fil de languette de type ceinture qui connecte électriquement les premier, second et troisième éléments de réception de lumière. Le premier fil de languette relie, en parallèle, les premier et second éléments de réception de lumière en connectant des électrodes de surface avant ou des électrodes de surface arrière des premier et second éléments de réception de lumière l'un à l'autre, et connecte en série, le premier ou le second élément de réception de lumière et le troisième élément de réception de lumière en s'étendant depuis les électrodes de surface avant ou les électrodes de surface arrière à connecter à une électrode de surface arrière ou à une électrode de surface avant du troisième élément de réception de lumière.
PCT/JP2017/032952 2017-09-13 2017-09-13 Module de cellules solaires et son procédé de fabrication WO2019053795A1 (fr)

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TW107100181A TWI643353B (zh) 2017-09-13 2018-01-03 太陽電池模組及其製造方法

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089705A (en) * 1976-07-28 1978-05-16 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Hexagon solar power panel
JP2004200515A (ja) * 2002-12-19 2004-07-15 Kyocera Corp 太陽電池モジュール
JP2006013406A (ja) * 2004-06-29 2006-01-12 Sanyo Electric Co Ltd 太陽電池モジュール
JP2012238884A (ja) * 2005-09-30 2012-12-06 Sanyo Electric Co Ltd 太陽電池セルの製造方法および太陽電池セルユニットの製造方法
JP2014007225A (ja) * 2012-06-22 2014-01-16 Sharp Corp 配線付き太陽電池セル、太陽電池モジュール、及び太陽電池アレイ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201015732A (en) * 2008-10-06 2010-04-16 Pegatron Corp Solar cell module
FR3024283B1 (fr) * 2014-07-25 2016-08-12 Commissariat Energie Atomique Module photovoltaique comprenant une pluralite de cellules bifaciales et procede de fabrication d'un tel module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089705A (en) * 1976-07-28 1978-05-16 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Hexagon solar power panel
JP2004200515A (ja) * 2002-12-19 2004-07-15 Kyocera Corp 太陽電池モジュール
JP2006013406A (ja) * 2004-06-29 2006-01-12 Sanyo Electric Co Ltd 太陽電池モジュール
JP2012238884A (ja) * 2005-09-30 2012-12-06 Sanyo Electric Co Ltd 太陽電池セルの製造方法および太陽電池セルユニットの製造方法
JP2014007225A (ja) * 2012-06-22 2014-01-16 Sharp Corp 配線付き太陽電池セル、太陽電池モジュール、及び太陽電池アレイ

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