EP2543075A2 - Cellule solaire avec forme spéciale de barre de bus, agencement de cellules solaires contenant cette cellule solaire et procédé de fabrication de la cellule solaire - Google Patents

Cellule solaire avec forme spéciale de barre de bus, agencement de cellules solaires contenant cette cellule solaire et procédé de fabrication de la cellule solaire

Info

Publication number
EP2543075A2
EP2543075A2 EP11708690A EP11708690A EP2543075A2 EP 2543075 A2 EP2543075 A2 EP 2543075A2 EP 11708690 A EP11708690 A EP 11708690A EP 11708690 A EP11708690 A EP 11708690A EP 2543075 A2 EP2543075 A2 EP 2543075A2
Authority
EP
European Patent Office
Prior art keywords
solar cell
contact
connecting line
busbar
current collecting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11708690A
Other languages
German (de)
English (en)
Inventor
Andreas Pfennig
Björn FAULWETTER-QUANDT
Andreas Hubert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hanwha Q Cells GmbH
Original Assignee
Q Cells SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Q Cells SE filed Critical Q Cells SE
Publication of EP2543075A2 publication Critical patent/EP2543075A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F77/00—Constructional details of devices covered by this subclass
    • H10F77/20—Electrodes
    • H10F77/206—Electrodes for devices having potential barriers
    • H10F77/211—Electrodes for devices having potential barriers for photovoltaic cells
    • H10F77/215—Geometries of grid contacts
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
    • H10F19/90—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers
    • H10F19/902—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers for series or parallel connection of photovoltaic cells
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F77/00—Constructional details of devices covered by this subclass
    • H10F77/93—Interconnections
    • H10F77/933—Interconnections for devices having potential barriers
    • H10F77/935—Interconnections for devices having potential barriers for photovoltaic devices or modules
    • H10F77/937—Busbar structures for modules
    • 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

Definitions

  • the invention relates to a solar cell with special Busbar form, a solar cell array containing this solar cell and a method for producing the solar cell.
  • Solar cells generally consist of a layer structure which is formed in a plate-shaped semiconductor material, for example monocrystalline or multicrystalline silicon.
  • the semiconductor material forms the p-type base.
  • a thin n-type layer By diffusion of phosphorus, a thin n-type layer, the so-called emitter, is produced on the surface.
  • the base is contacted by means of a full-surface applied aluminum layer.
  • the emitter is contacted via narrow fingers, which are interconnected by one or more so-called busbars. Since the metallic fingers and busbars do not allow light to enter the contacted areas of the cell, but increase the number and width of fingers but the series resistance, the fingers and busbars must be designed so that electrical losses and shadowing losses are minimized.
  • the busbars are band-shaped, with the busbars typically having a uniform width in the range of 1.5 to 2 mm.
  • Solar cells are generally electrically interconnected by interconnecting their busbars with metallic conductive tapes (also referred to as contact tapes, soldering tapes or interconnects).
  • metallic conductive tapes also referred to as contact tapes, soldering tapes or interconnects.
  • the contact strips are soldered onto the busbars.
  • a contact band is usually used which is wider than the busbar of the solar cell. The reasons for this are, for example, inaccuracies in the positioning of a contact band on a busbar and bending of the contact band (so-called saber). If the width of the bus bar is equal to the width of the contact band, these effects lead to egg ner additional shading and thus to a higher additional power loss.
  • the busbars also referred to as busbar electrodes
  • JP 2006270043 A describes a solar cell module which is capable of preventing the chipping of a inner lead wire of bus bar electrodes on a solar cell element while at the same time increasing the electric power output.
  • the solar cell module has a solar cell element with busbar electrodes for the decrease of the electrical power from their surfaces and an inner lead wire, which is electrically connected to the busbar electrodes over almost their entire length.
  • the inner conductor wire is structured so that its tip is shaped as the thinnest part.
  • JP 2008282990 A and WO 08/139787 A1 describe a solar cell in which a busbar electrode and a plurality of finger electrodes extending from the busbar electrode are mounted on a first main surface of a semiconductor substrate.
  • the busbar electrode includes a first conductive part to connect to an interconnector, and a redirecting part connected to the first conductive part, a part of which is not connected to the interconnector.
  • DE 10 2007 062 689 A1 describes configurations of contacting and current collecting electrodes for solar cells which have thin current collecting fingers arranged in parallel on a front side of the solar cell and rows of individual connection points for receiving soldered metal contact strips, such as copper, aluminum, form the discharge of electricity from the solar cell.
  • connection points are formed essentially on a straight line at right angles to the current collecting fingers and a plurality of parallel fingers are in each case brought together in the region of connection points on both sides and the connections formed can be connected to the metallic contact strip.
  • JP 2006266262 A (WO 07 / 122897A) describes a solar cell with an interconnector, a solar cell module and a method for the production of a solar cell module.
  • a busbar electrode and a collector electrode are provided, and an interconnector is connected to the upper surface of the busbar electrode.
  • the bus bar electrode is wider than the interconnector and an area in the width direction of the upper surface
  • the busbar electrode where the interconnect is not connected has a part that does not have any solder.
  • US 2009/277491 A describes a solar cell including a semiconductor substrate having a first major surface. On the first main surface, there are provided a busbar electrode and a plurality of linear finger electrodes extending from the busbar electrode.
  • the busbar electrode includes a first connecting part to be connected to an interconnector and a second non-connecting part not connected to an interconnector. The first connecting part and the first non-connecting part are arranged alternately.
  • the object of the invention was to provide a solar cell in which effects such as positioning errors of a contact band and saber effects do not lead to a loss of power.
  • the invention thus relates to a solar cell, comprising a substrate, a semiconductor layer, a first busbar on a first surface of the semiconductor layer and a second busbar on a second surface of the semiconductor layer, wherein the first busbar along a connecting line contact islands with a maximum width b
  • a ratio between bi max and bsmax is in the range of 1.1 to 15, particularly preferably in the range of 1.3 to 10.
  • a ratio between b Sm ax and b Sm in is in the range from 1:05 to 20, particularly preferably in the range from 1.1 to 15.
  • the contact islands can have different geometric shapes. Possible are round and angular shapes. Preferred round shapes are circles and ellipses. Preferred angular shapes are squares or hexagons. According to the invention, the contact islands are formed as circles.
  • the contact islands are at least partially equipped with an electrically conductive material.
  • the contact islands may preferably have recesses. This generally means that only a part of a contact pad has an electrically conductive material. However, it is also possible that only a part of the contact islands has recesses.
  • the recess may, for example, be a circular surface, so that the electrically conductive material is located in a circular ring arranged around this circular surface. However, other geometric shapes for the recess are possible, including a grid structure.
  • an angle ⁇ lies between a first straight line through the point P1 and the point P3 and a second straight line through the point P2 and the point P4, wherein the points P1 and P3 and the points P2 and P4 respectively are arranged on the same side of the connecting line, in the range of 3 to 50 °, more preferably in the range of 5 to 45 ° and most preferably in the range of 8 to 40 °.
  • the first and second straight lines can be imaginary straight lines, since any geometry is possible for the course of the current collecting region between the contact islands.
  • the area between point P1 and P3 as well as the area between point P2 and P4 may be linear or curved.
  • the area between point P1 and point P3 and the area between point P2 and P4 are substantially linear.
  • essentially linear means that the magnitude of a slope of a straight line at point P3 and at point P4 is preferably somewhat lower than at point P1 or P2, so that, starting from P1, the width of the current collecting region preferably first decreases linearly, which is in the range around point P2 connects a curved area, after which the width of the current collecting area in turn increases linearly to the next contact pad.
  • an angle ⁇ between a first tangent to the contact pad at point P1 and a second tangent to the contact pad at point P2 is in the range between 50 and 150 °, more preferably in the range between 70 and 130 °.
  • the contact pads and the current collecting areas of the solar cell contain an electrically conductive paste.
  • the solar cell is preferably obtainable by printing the conductive paste, ie by metallization, by means of screen printing.
  • layers can be provided in different ways, e.g. by galvanic means.
  • the substrate is generally a transparent pane, e.g. of glass or polycarbonate, preferably of glass.
  • the solar cell of the invention comprises, in addition to the substrate, the semiconductor layer and the bus bar, further layers, e.g. a monolayer or multilayer film, an antireflective layer (e.g., of silicon nitride) and / or another protective film (e.g., ethylene-vinyl acetate polymer).
  • a monolayer or multilayer film e.g. an antireflective layer (e.g., of silicon nitride) and / or another protective film (e.g., ethylene-vinyl acetate polymer).
  • a solar cell according to the invention generally has a size of 100 to 200 mm ⁇ 100 to 200 mm along a connecting line 8 to 15, preferably 10 to 13 contact islands.
  • the contact islands in this case preferably have a size with dimensions in the range of 1 to 2 mm and are, for example, circular surfaces with a diameter between 1 and 2 mm, preferably from 1, 3 to 1.7 mm, in particular 1, 4 to 1, 6 mm.
  • the invention furthermore relates to a method for producing a solar cell as described above, comprising the step of, on a solar cell comprising a substrate, a semiconductor layer, a first busbar on a first surface of the semiconductor layer and a second busbar on a second surface of the semiconductor cell Semiconductor layer, the first busbar is applied to the first surface of the semiconductor layer, that the first busbar along a connecting line contact islands with a maximum width b
  • the invention also relates to a solar cell arrangement, in which at least two of the solar cells described above are electrically conductively connected to each other by a first busbar is connected on a first solar cell by means of a contact strip with a second busbar on an adjacent solar cell.
  • the solar cell arrangement can in particular be a linear arrangement of solar cells in the form of a string or a two-dimensional arrangement in the sense of a solar module.
  • the connection of the first busbar on the first solar cell to the second busbar on the adjacent solar cell by means of a contact band is generally carried out using a soldering method.
  • soldering method the infrared brazing, hot air soldering, flame brazing, induction brazing, stamp soldering (contact soldering with a hot soldering tip, a hot soldering iron or the like) or laser soldering.
  • the invention has the advantage that solar cells can be interconnected in a more efficient manner to solar cell arrangements such as strings or modules. Shadow losses and, in general, a power mismatch (power loss) can be minimized in this way.
  • FIG. 1 shows a plan view of a detail of a busbar of a solar cell according to the invention, in which two contact islands are connected to one another by means of a current collecting region along a connecting line.
  • FIG. 2 shows a side view of a solar cell arrangement according to the invention, in which three solar cells are electrically interconnected in series.
  • FIG. 3 shows a plan view of a solar cell according to the invention with three busbars in which contact islands are connected to each other by means of current collecting areas along a connecting line.
  • Figure 1 shows a plan view egg nen section of a first bus bar 4 egg ner solar cell according to the invention, in which along a connecting line 8, two contact islands 9,9 'are connected to each other by means of a current collecting area 10.
  • the first busbar 4 has in particular along the connecting line 8 contact islands 9,9 'with a maximum width b
  • a current collecting region 10 on the connecting line 8 which contacts the contact islands 9, 9' in a contact region 11, wherein the contact region 11 has two outer points P1 and P2 on both sides of the connecting line 8, the distance perpendicular to the connecting line 8 a maximum width b Smax of Current collection area 10 defined, where b
  • the width b of the current collecting region 10 decreases starting from a contact pad 9 to an adjacent contact pad 9 'initially to a minimum width b Sm in between two inner points P3 and P4 and then to the adjacent contact pad. 9 'back to a maximum width bs max ' too.
  • max and b Smax in the range of 1.3 to 10 a ratio between b Smax and b Sm in in the range of 1, 1 to 15 and a ratio between b
  • the left contact pad 9 is designed as a circle, in particular as a filled circle, while the right contact pad 9 'is a circle with a circular recess 12, that is configured as a circular ring.
  • an angle et between a first straight line 16 passes through the point P1 and the point P3 and a second straight line 17 through the point P2 and the point P4, the points P1 and P3 and the points P2 and P4 are each arranged on the same side of the connecting line 8, in the range of 8 to 40 °.
  • the first straight line 16 and the second straight line 17 here illustrate the linear decrease of the width of the current collecting area 10 starting from the outer points P1 and P2.
  • the straight lines are flattened so that the current collecting area 10 is wider here than would be expected on account of the linear progression of the straight line.
  • the pads 9 and 9 'and the current collecting areas 10 comprise an electrically conductive paste which has been screen printed by printing the conductive paste.
  • 2 shows a side view of a solar cell arrangement in which three solar cells 1, 1 'and 1 "are connected electrically in series with one another
  • Each solar cell 1, 1' and 1" comprises a substrate 2, here a glass pane, a semiconductor layer 3, a first one Busbar 4 on a first surface 5 of the semiconductor layer 3 and a second busbar 6 on a second surface 7 of the semiconductor layer 3.
  • a contact strip 15 connects two adjacent solar cells.
  • a contact strip 15 connects the second busbar 6 of the solar cell 1 to the first busbar 4 of the solar cell V.
  • a contact strip 15 connects the second busbar 6 of the solar cell 1 'to the first busbar 4 of the solar cell 1 " a series connection of the solar cells is achieved.
  • FIG. 3 shows a top view of a solar cell 1 according to the invention with three first busbars 4, in which along a connecting line 8 12 contact islands 9, 9 ', etc. are connected to each other by means of current collecting areas 10.
  • the contact strips 15, which connect the solar cell 1 via the three first busbars 4 to an adjacent solar cell (not shown here), are indicated.

Landscapes

  • Photovoltaic Devices (AREA)

Abstract

L'invention concerne une cellule solaire (1) comprenant un substrat (2), une couche semi-conductrice (3), une première barre de bus (4) sur une première surface (5) de la couche semi-conductrice (3) et une seconde barre de bus (6) sur une seconde surface (7) de la couche semi-conductrice (3), la première barre de bus (4) comportant le long d'une ligne de connexion (8) des îlots de contact (9, 9') avec une largeur maximale blmax perpendiculairement à la ligne de connexion (8), entre lesquels se trouve sur la ligne de connexion (8) respectivement une zone collectrice de courant (10) qui est en contact avec les îlots de contact (9, 9') dans une zone de contact (11), la zone de contact (11) comportant des deux côtés de la ligne de connexion (8) deux points extérieurs (P1) et (P2) dont la distance perpendiculairement à la ligne de connexion (8) définit une largeur maximale bSmax de la zone collectrice de courant (10), telle que blmaxSmax, et la largeur b de la zone collectrice de courant (10) sortant d'un îlot de contact (9) jusqu'à un îlot de contact voisin (9') se réduit d'abord jusqu'à une largeur minimale bSmin entre deux points intérieurs (P3) et (P4) et augmente ensuite à nouveau juqu'à l'îlot de contact voisin (9') à une largeur maximale bSmax.
EP11708690A 2010-03-02 2011-01-18 Cellule solaire avec forme spéciale de barre de bus, agencement de cellules solaires contenant cette cellule solaire et procédé de fabrication de la cellule solaire Withdrawn EP2543075A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010002521.6A DE102010002521B4 (de) 2010-03-02 2010-03-02 Solarzelle mit spezieller Busbarform, diese Solarzelle enthaltende Solarzellenanordnung sowie Verfahren zur Herstellung der Solarzelle
PCT/DE2011/075005 WO2011107089A2 (fr) 2010-03-02 2011-01-18 Cellule solaire avec forme spéciale de barre de bus, agencement de cellules solaires contenant cette cellule solaire et procédé de fabrication de la cellule solaire

Publications (1)

Publication Number Publication Date
EP2543075A2 true EP2543075A2 (fr) 2013-01-09

Family

ID=44542645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11708690A Withdrawn EP2543075A2 (fr) 2010-03-02 2011-01-18 Cellule solaire avec forme spéciale de barre de bus, agencement de cellules solaires contenant cette cellule solaire et procédé de fabrication de la cellule solaire

Country Status (6)

Country Link
US (1) US20120318351A1 (fr)
EP (1) EP2543075A2 (fr)
JP (1) JP5819862B2 (fr)
CN (1) CN102884635B (fr)
DE (1) DE102010002521B4 (fr)
WO (1) WO2011107089A2 (fr)

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KR20140113702A (ko) * 2011-12-30 2014-09-24 엠이엠씨 싱가포르 피티이. 엘티디. 태양광 모듈을 위한 버스 바
DE102012100285B4 (de) * 2012-01-13 2017-07-20 Hanwha Q.CELLS GmbH Solarzellen Rückseitenstruktur
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KR101823605B1 (ko) * 2016-12-02 2018-03-14 엘지전자 주식회사 태양 전지 및 이를 포함하는 태양 전지 패널
CN112420853B (zh) * 2019-08-21 2023-04-18 苏州阿特斯阳光电力科技有限公司 多主栅太阳能电池及太阳能组件
US12094991B2 (en) * 2019-11-13 2024-09-17 Maxeon Solar Pte. Ltd. Hybrid dense solar cells and interconnects for solar modules and related methods of manufacture
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Also Published As

Publication number Publication date
DE102010002521B4 (de) 2021-03-18
CN102884635B (zh) 2016-01-20
CN102884635A (zh) 2013-01-16
DE102010002521A1 (de) 2011-11-17
JP5819862B2 (ja) 2015-11-24
JP2013521635A (ja) 2013-06-10
WO2011107089A3 (fr) 2012-05-03
WO2011107089A2 (fr) 2011-09-09
US20120318351A1 (en) 2012-12-20

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