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WO2014096929A2 - Elément de cellule photovoltaïque à configuration d'électrode spécifique - Google Patents

Elément de cellule photovoltaïque à configuration d'électrode spécifique Download PDF

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Publication number
WO2014096929A2
WO2014096929A2 PCT/IB2013/002789 IB2013002789W WO2014096929A2 WO 2014096929 A2 WO2014096929 A2 WO 2014096929A2 IB 2013002789 W IB2013002789 W IB 2013002789W WO 2014096929 A2 WO2014096929 A2 WO 2014096929A2
Authority
WO
WIPO (PCT)
Prior art keywords
front surface
electrodes
bus bar
photovoltaic cell
finger
Prior art date
Application number
PCT/IB2013/002789
Other languages
English (en)
Other versions
WO2014096929A3 (fr
WO2014096929A8 (fr
Inventor
Raymond Yang Ming LIM
Original Assignee
Rec Solar Pte. Ltd.
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 Rec Solar Pte. Ltd. filed Critical Rec Solar Pte. Ltd.
Priority to US29/485,353 priority Critical patent/USD741793S1/en
Publication of WO2014096929A2 publication Critical patent/WO2014096929A2/fr
Publication of WO2014096929A8 publication Critical patent/WO2014096929A8/fr
Publication of WO2014096929A3 publication Critical patent/WO2014096929A3/fr

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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
    • 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

  • Photovoltaic cell element having a specific electrode configuration
  • the present invention relates to a photovoltaic cell element having a specific electrode configuration and to a photovoltaic module comprising such photovoltaic cell element.
  • Photovoltaic cells are electrical devices that convert energy of light into electrical energy by a photovoltaic effect.
  • On the light receiving side of a photovoltaic cell it is common practice to optimize a light receiving area while ensuring acceptable series resistance using a metallic grid with many thin parallel finger electrodes that are connected to two, three or four wider bus bar electrodes extending perpendicular to the finger electrodes and used for collecting the electric current from the finger electrodes.
  • conducting metallic ribbons may be soldered to the bus bar electrodes in order to connect the photovoltaic cells to external module contacts or to interconnect adjacent photovoltaic cells.
  • a photovoltaic cell element in one embodiment, includes a substrate including a front surface, a back surface and front surface electrodes over the front surface.
  • the front surface electrodes include a plurality of front surface bus bar electrodes coupled to a plurality of front surface finger electrodes. Widths of the front surface bus bar electrodes are between about 0.5 mm and about 2.5 mm.
  • the plurality of front surface bus bar electrodes are substantially parallel to each other and substantially perpendicular to the front surface finger electrodes. Widths of the front surface finger electrodes are between about 30 ⁇ and about 100 ⁇ .
  • the front surface electrodes also include first front surface redundancy line electrodes between each two adjacent front surface bus bar electrodes.
  • the first front surface redundancy line electrodes are substantially parallel to the bus bar electrodes and substantially perpendicular to the front surface finger electrodes to couple to the front surface finger electrodes. Widths of the first front surface redundancy line electrodes are between about 30 ⁇ and about 500 ⁇ .
  • a photovoltaic module includes a plurality of photovoltaic cells electrically interconnected by means of connection members. Each photovoltaic cell includes a substrate including a front surface, a back surface and front surface electrodes over the front surface.
  • the front surface electrodes include a plurality of front surface bus bar electrodes coupled to a plurality of front surface finger electrodes and coupled to the connection members.
  • Widths of the front surface bus bar electrodes are between about 0.5 mm and about 2.5 mm.
  • the plurality of front surface bus bar electrodes are substantially parallel to each other and substantially perpendicular to the front surface finger electrodes. Widths of the front surface finger electrodes are between about 30 ⁇ and about 100 ⁇ .
  • the front surface electrodes also include first front surface redundancy line electrodes between each two adjacent front surface bus bar electrodes. The first front surface redundancy line electrodes are substantially parallel to the bus bar electrodes and substantially perpendicular to the front surfaee finger electrodes to couple to the front surface finger electrodes. Widths of the first front surface redundancy line electrodes are between about 30 ⁇ and about 500 ⁇ .
  • Fig. 1 shows a perspective view of an embodiment of a photovoltaic cell element
  • Fig. 2 shows a layout of an embodiment of a photovoltaic cell element
  • Fig. 3 shows another layout of an embodiment of a photovoltaic cell element
  • Fig. 4 shows yet another layout of an embodiment of a photovoltaic cell element.
  • Embodiments generally relate to devices, for example, devices for converting energy of light into electrical energy. More particularly, the devices may be photovoltaic cell elements or photovoltaic cell modules including a plurality of photovoltaic cell elements.
  • Fig. 1 shows a perspective view of an embodiment of a photovoltaic cell element 100.
  • the photovoltaic cell element 100 includes a substrate 101.
  • the substrate 101 may be e.g. a monoerystalline, multicrystalline, amorphous or compound semiconductor substrate. Other types of substrates may also be useful.
  • a silicon substrate is used as the semiconductor substrate.
  • the substrate includes first and second surfaces.
  • the first surface may include a light receiving surface or a front surface 106, while the second surface may include a non-light receiving surface or a back surface 107.
  • the substrate 101 is doped with a p-type dopant, and a front surface layer 109 in the substrate is doped with an n-type dopant.
  • the front surface layer 109 is commonly referred to as an emitter layer.
  • the p-type dopant may include boron (B) or any other element or combination of elements that acts as a p-type dopant in silicon.
  • the n-type dopant may include phosphorus (P) or any other element or combination of elements that acts as an n-type dopant in silicon.
  • the substrate 101 is doped with an n-type dopant, and the front surface layer 109 in the substrate is doped with a p-type dopant. In all embodiments, there may be an anti-reflection layer 110 on the front surface.
  • the thickness of the substrate 101 may be from about ⁇ ⁇ to about 500 ⁇ .
  • the size of the substrate may be about 15.6 x 15.6 cm 2 . Other sizes of the substrate, for example, about 12.5 x 12.5 cm 2 or about 10 x 10 cm 2 , may also be useful.
  • the front surface 106 of the substrate 101 includes a plurality of front surface electrodes.
  • the front surface electrodes may include a plurality of front surface bus bar electrodes 102 and a plurality of front surface finger electrodes 103.
  • the front surface electrodes may include three front surface bus bar electrodes 102 and a large number of front surface finger electrodes 103 as shown in Fig. 1. Having other numbers of front surface bus bar electrodes, for example, two or four, may also be useful.
  • the back surface of the substrate includes back surface contacts 108.
  • the back surface contacts may include one or more conductive layers which fully cover the back surface of the photovoltaic cell.
  • the conductive layers may include a metal, for example, aluminum, molybdenum, silver or a combination thereof.
  • the back surface of the photovoltaic cell is not fully covered by the back surface contacts.
  • the back surface contacts may have a similar configuration as the front surface electrodes. Having back surface contacts of other configurations or made of other materials may also be useful.
  • Fig. 2 shows a layout of an embodiment of a photovoltaic cell element 200.
  • the front surface finger electrodes 103 may be electrodes configured to collect photo-induced carriers.
  • a plurality of the front surface finger electrodes 103 may be arranged substantially parallel to each other and parallel to one edge of the substrate and almost throughout the front surface of the substrate.
  • the width of a front surface finger electrode 103 may be between about 30 ⁇ and about ⁇ , for example about 60 ⁇ .
  • the front surface finger electrodes 103 may or may not have the same width.
  • the front surface finger electrodes may be equally spaced apart. The spacing between two adjacent front surface finger electrodes may be between about 1mm and about 3mm, for example about 2mm.
  • Front surface finger electrodes with uneven spacing may also be useful.
  • the front surface finger electrodes may be made of copper, silver, an alloy where one of these metals are the major component or any other conducting material.
  • the front surface finger electrodes 103 as well as the front surface bus bar electrodes 102 and/or the front surface redundancy line electrodes 104 and 105 may be made using various methods such as industrially applicable production methods as e.g. screen printing, roller printing, ink jet printing, etc.
  • the front surface bus bar electrodes 102 may be electrodes configured to extract the carriers collected by the finger electrodes 103. In one embodiment, there are three front surface bus bar electrodes 102 arranged over the front surface 106 of the substrate to couple to the front surface finger electrodes 103. Other numbers of bus bar electrodes 102, for example two or four, may also be useful.
  • the front surface bus bar electrodes 102 may be substantially parallel to each other and substantially perpendicular to the front surface finger electrodes 103.
  • the width of a front surface bus bar electrode may be between about 0.5mm and about 2.5mm, for example about 1.5mm.
  • the front surface bus bar electrodes may have a continuous width or alternatively the width may vary along the length of a front surface bus bar electrode and a front surface bus bar electrode may for example be tapered towards its ends.
  • the front surface bus bar electrodes may or may not have the same width.
  • the front surface bus bar electrodes may be equally spaced apart. The spacing between two adjacent front surface bus bar electrodes may be dependent on the cell size and number of bus bar electrodes. For example, the spacing between two adjacent front surface bus bar electrodes may be about 40mm for a 15.6 x 15.6 cm 2 photovoltaic cell element with three front surface bus bar electrodes 102. Front surface bus bar electrodes 102 with uneven spacing may also be useful.
  • the front surface bus bar electrodes 102 may be made of the same materials as the finger electrodes and may be made preferably with a solderable material, and may have the same or a different thickness compared to the finger electrodes.
  • Front surface redundancy line electrodes 104 and 105 may be electrodes configured to provide low resistance current paths particularly when the cell contains interrupted finger electrodes 103.
  • the front surface redundancy line electrodes 104 and 105 are provided such that each finger electrode 103 crosses at least one first front surface redundancy line electrodes 105 when running from one front surface bus bar electrode 102 to an adjacent front surface bus bar electrode 102 and/or furthermore such that each finger electrode 103 is connected to at least one second front surface redundancy line electrodes 104 when running from one front surface bus bar electrode 102 towards an edge of the substrate 101.
  • the front surface redundancy line electrodes 104, 105 may be substantially perpendicular to the finger electrodes 103 and substantially parallel to the bus bar electrode lines 102, but preferably narrower than the bus bar electrode lines 102 in order not to substantially reduce the light receiving area of the photovoltaic cell.
  • the width of a front surface redundancy line electrode 104, 105 may be between 30 ⁇ and 500 ⁇ , preferably between 50 ⁇ and 400 ⁇ , for example about 60 ⁇ .
  • the front surface redundancy line electrode 104, 105 may be narrower than half the width, preferably narrower than a quarter the width, and more preferably smaller than 10% of the width of the bus bar electrodes 102.
  • the front surface redundancy line electrodes 104, 105 may or may not have the same width.
  • the front surface redundancy line electrodes 104, 105 may be made of the same materials as the finger electrodes, and may have the same or a different thickness compared to the finger electrodes 103.
  • the front surface finger electrodes 103 are continuous between adjacent bus bar electrodes 102.
  • a plurality of redundancy line electrodes 104, 105 substantially parallel to the bus bar electrode lines 102 may be arranged over the front surface 106 of the substrate.
  • one first redundancy line electrode 105 between each two adjacent bus bar electrodes 102 is included over the front surface 106 of the substrate.
  • the first redundancy line electrodes 105 may be positioned about mid- way between two adjacent front surface bus bar electrodes 102. Including the first redundancy line electrodes 105 in other positions between two adjacent front surface bus bar electrodes 102 may also be useful.
  • the redundancy line electrodes 104, 105 may be of different widths.
  • redundancy line electrodes 104 there are two or more redundancy line electrodes 104 between each two adjacent bus bar electrodes 102.
  • Other configurations of the redundancy line electrodes 104, 105 may also be useful.
  • the redundancy line electrodes 104, 105 connect the finger electrodes 103 to enable current flow to adjacent finger electrodes 103 in the case of finger electrode interruption.
  • the production results show that there are fewer produced photovoltaic modules with reduced efficiency.
  • qualification tests also indicate that the redundancy line electrodes 104, 105 will increase the practical service life of photovoltaic modules after they are installed in power plants.
  • Fig. 3 shows yet another embodiment of a configuration of a photovoltaic cell element 300. Features in this embodiment which are similar to that described in Figs. 1 and 2 will not be described or described in detail.
  • the front surface finger electrodes 103 are discontinuous between adjacent bus bar electrodes 102.
  • the discontinuity denoted as "D"
  • the discontinuity may be positioned about mid- way between two adjacent bus bar electrodes 102.
  • the discontinuity may be about equal to the finger electrode spacing. Having discontinuities smaller than the finger electrode spacings may also be useful.
  • the discontinuity "D" may be between about 50 ⁇ and about 3000 ⁇ , for example about 100 ⁇ ,.
  • the front surfaee of the substrate includes first redundancy line electrodes 105 arranged between each two adjacent front surface bus bar electrodes 102 to connect the ends of discontinuous finger electrodes 103, and second redundancy line electrodes 104 included between the outermost front surface bus bar electrodes 102 and edges of the photovoltaic cell element.
  • first redundancy line electrodes 105 may be arranged between each two adjacent front surface bus bar electrodes 102 wherein one of these first redundancy line electrodes 105 connects ends of discontinuous finger electrodes being coupled to one of these front surface bus bar electrodes 102 whereas another one of these first redundancy line electrodes 105 connects ends of discontinuous finger electrodes being coupled to the other one of these front surface bus bar electrodes 102. Therein, the two or more first redundancy line electrodes 105 may enclose the discontinuity D.
  • one or more second redundancy line electrodes 104 may be included to connect the outermost ends of the front surface finger electrodes 103 near the edges of the substrate.
  • the widths of the redundancy line electrodes 104 and 105 may be between about 30 ⁇ and about 500 ⁇ , for example about 60 ⁇ .
  • the redundancy line electrodes 104, 105 may be of different widths.
  • the redundancy line electrodes 104, 105 may be made of the same materials as the finger electrodes 103, and may have the same or a different thickness compared to the finger electrodes 103.
  • the front surface of the substrate includes three bus bar electrodes 102, two first redundancy lines 105 between each of two adjacent bus bar electrodes 102 to connect the ends of discontinuous finger electrodes 103 and two second redundancy lines 104 connecting the outermost ends of the finger electrodes 103.
  • the number of redundancy lines 104, 105 may vary with the number of bus bar electrodes 102 and the number of discontinuities of finger electrodes 102.
  • Fig. 4 shows another exemplary embodiment of a photovoltaic element 400 having finger electrodes 103, three bus bar electrodes 102, two first redundancy lines 105 between each of two adjacent bus bar electrodes 102 to connect the ends of discontinuous finger electrodes 103 and two second redundancy lines 104 connecting the outermost ends of the finger electrodes 103.
  • Other numbers of bus bar electrodes 102 for example, 4 or 5, may also be possible.
  • a small gap of width D in a range of between about 50 ⁇ and about 3mm is provided between two adjacent first redundancy lines 105.
  • the bus bar electrodes 102 may have a width of between about 0.5 and about 2.5mm which reduces from a maximum width Wbl to a minimum width Wb2 towards the extremities of the bus bar electrodes 102.
  • the finger electrodes 103 may have a width of between about 30 ⁇ and about ⁇ ⁇ .
  • the redundancy lines 104, 105 may have a width of between about 30 ⁇ and about 500 ⁇ .
  • the spacings S between finger electrodes 103 may be between about lmm and about 3mm. Ah overall width Wl of the electrode pattern may be approximately 153mm.
  • the width of the photovoltaic element 400 may be approximately 156mm.
  • the widths W2 and W3 in the figure may be e.g. approximately 25 and 52 mm, respectively. All indicated dimensions are exemplary only.
  • a plurality of photovoltaic cell elements as described in Figs. 2 or 3 may be connected to each other by means of connection members, for example, wirings, ribbons or tabs, and encapsulated with polymer and glass layers to form a photovoltaic cell module.
  • the bus bar electrodes 102 are coupled to the connection members for example by soldering a metal ribbon to each of the bus bar electrodes 102 whereas the redundancy line electrodes 104, 105 preferably are not coupled to any connection members.
  • bus bar electrodes 102 are electrically interconnected to the back surface contacts of adjacent cells by means of the connection members.
  • the numbers of photovoltaic cell elements in one photovoltaic cell module may be, for example, 10 6 or 12 x 6. Other configurations may also be useful.
  • insignificant deviation from the specified arrangement may include for example deviations of up to 20°.

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  • Photovoltaic Devices (AREA)

Abstract

L'invention concerne un élément de cellule photovoltaïque (100). L'élément de cellule photovoltaïque comprend un substrat (101) comprenant une surface avant (106), une surface arrière (107) et des électrodes de surface avant sur la surface avant. Les électrodes de surface avant comprennent une pluralité d'électrodes de barre omnibus de surface avant (102) couplées à une pluralité d'électrodes de doigt de surface avant (103). Des largeurs des électrodes de barre omnibus de surface avant (102) sont entre environ 0,5 mm et environ 2,5 mm. La pluralité d'électrodes de barre omnibus de surface avant (102) sont sensiblement parallèles les unes par rapport aux autres et sensiblement perpendiculaires aux électrodes de doigt de surface avant (103). Des largeurs des électrodes de doigt de surface avant (103) sont entre environ 30 µm et environ 100 µm. Les électrodes de surface avant comprennent également des premières électrodes de ligne de redondance de surface avant (105) entre chaque deux électrodes de barre omnibus de surface avant (102). Les électrodes de ligne de redondance de surface avant (105) sont sensiblement parallèles aux électrodes de barre omnibus (102) et sensiblement perpendiculaires aux électrodes de doigt de surface avant (103) pour se coupler aux électrodes de doigt de surface avant (103). Des largeurs des premières électrodes de ligne de redondance de surface avant (104) sont entre environ 30 µm et environ 500 µm.
PCT/IB2013/002789 2012-12-19 2013-12-17 Elément de cellule photovoltaïque à configuration d'électrode spécifique WO2014096929A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US29/485,353 USD741793S1 (en) 2012-12-19 2014-03-18 Photovoltaic cell element electrode

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US201261739106P 2012-12-19 2012-12-19
GB1223019.9 2012-12-19
GB1223019.9A GB2509097A (en) 2012-12-19 2012-12-19 Photovoltaic cell element having a specific electrode configuration
US61/739,106 2012-12-19
US61/739,108 2012-12-19

Related Child Applications (1)

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US29/485,353 Continuation USD741793S1 (en) 2012-12-19 2014-03-18 Photovoltaic cell element electrode

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WO2014096929A2 true WO2014096929A2 (fr) 2014-06-26
WO2014096929A8 WO2014096929A8 (fr) 2014-09-04
WO2014096929A3 WO2014096929A3 (fr) 2014-11-20

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US (1) USD741793S1 (fr)
GB (1) GB2509097A (fr)
TW (1) TW201444103A (fr)
WO (1) WO2014096929A2 (fr)

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WO2014096929A3 (fr) 2014-11-20
WO2014096929A8 (fr) 2014-09-04
GB201223019D0 (en) 2013-01-30
GB2509097A (en) 2014-06-25
TW201444103A (zh) 2014-11-16
USD741793S1 (en) 2015-10-27

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