EP2130232A2 - Système à cellule solaire, module de cellule solaire et dispositif de jonction - Google Patents

Système à cellule solaire, module de cellule solaire et dispositif de jonction

Info

Publication number
EP2130232A2
EP2130232A2 EP08717755A EP08717755A EP2130232A2 EP 2130232 A2 EP2130232 A2 EP 2130232A2 EP 08717755 A EP08717755 A EP 08717755A EP 08717755 A EP08717755 A EP 08717755A EP 2130232 A2 EP2130232 A2 EP 2130232A2
Authority
EP
European Patent Office
Prior art keywords
solar cell
connection
busbars
connecting portion
busbar
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Withdrawn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
EP08717755A
Other languages
German (de)
English (en)
Inventor
Karsten Von Maydell
Jörg Müller
Dominik Huljic
Andreas Mohr
Thomas Zerres
Sebastian Falkner
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.)
Q Cells SE
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 EP2130232A2 publication Critical patent/EP2130232A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H01L31/022433—Particular geometry of the grid contacts
    • 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
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H01L31/022441—Electrode arrangements specially adapted for back-contact solar 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
    • H01L31/0248—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 characterised by their semiconductor bodies
    • H01L31/0352—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 characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions
    • H01L31/035272—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 characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions characterised by at least one potential jump barrier or surface barrier
    • H01L31/03529—Shape of the potential jump barrier or surface barrier
    • 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
    • H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H01L31/0516—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module specially adapted for interconnection of back-contact solar 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
    • H01L31/04—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
    • H01L31/06—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 characterised by at least one potential-jump barrier or surface barrier
    • H01L31/068—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 characterised by at least one potential-jump barrier or surface barrier the potential barriers being only of the PN homojunction type, e.g. bulk silicon PN homojunction solar cells or thin film polycrystalline silicon PN homojunction solar cells
    • H01L31/0682—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 characterised by at least one potential-jump barrier or surface barrier the potential barriers being only of the PN homojunction type, e.g. bulk silicon PN homojunction solar cells or thin film polycrystalline silicon PN homojunction solar cells back-junction, i.e. rearside emitter, solar cells, e.g. interdigitated base-emitter regions back-junction cells
    • 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
    • Y02E10/547—Monocrystalline silicon PV cells

Definitions

  • the invention relates to a solar cell device according to the preamble of claim 1, a solar cell module with such a solar cell device and a connection arrangement according to the preamble of the claim Friedrich! Reference source not found..
  • a solar cell module in which the individual solar cells are connected to one another by means of compact connecting elements.
  • Such compact connecting elements can be used whenever there are no more than two bus bars, so-called busbars, per solar cell.
  • Gee et al. Silicone et al. (“Simplified module assembly using back-contact crystalline-silicon solar cells", 26 th IEEE PVSC, 1997, pp. 1085-1088) describe a series connection of several solar cells with one another, which takes place by means of a connecting foil arranged on the film contacts and the contact areas of the interconnected solar cells.
  • Van Kershaver et al. (“Record high performance modules based on screen printed MWT solar cells", 29 th IEEE PVSC, 2002, pp. 78-81) propose several interconnection modes of individual solar cells, the interconnection being parallel to the busbars of the individual solar cells, with different geometric Busbar arrangements are described in order to connect solar cells with more than two busbars together.
  • the invention has for its object to provide a back-contacted solar cell device that can be easily interconnected with other solar cells or solar cell devices to form a module even in the presence of more than two busbars.
  • the invention is further based on the object to provide a corresponding solar cell module and a corresponding connection arrangement.
  • such a solar cell device comprises a solar cell with a semiconductor having at least one p-doped and at least one n-doped region, electrical p-contacts and electrical n-contacts, which are arranged on a back side of the solar cell and with the correspondingly doped regions of the semiconductor, at least one p-busbar connected to the p-type electrical contacts and at least one n-busbar connected to the n-type electrical contacts, the busbars respectively collecting the current of the electrical contacts and a longitudinal direction. Furthermore, a connection arrangement is provided, which is designed for the electrically conductive connection of at least one of the busbars of the solar cell with at least one busbar of an adjacent solar cell.
  • the term “rear side” refers to the side of the solar cell device which is arranged opposite the front side of the solar cell device, with light incident on the front side onto the solar cell.
  • connection arrangement has at least one first connection section extending substantially perpendicular to the longitudinal extension direction of the busbars, which is selectively connected by connection regions to at least one busbar.
  • “Pointed” should not be a mathematical point, but rather a small area Designation of the connection area.
  • the entire overlapping region of the first connection section with the corresponding busbar is regarded as a punctual connection region.
  • the connecting arrangement preferably has at least one second connecting section which, like the first connecting section, is oriented essentially perpendicular to the longitudinal extension direction of the busbars of the solar cell, and furthermore at least one third connecting section, which is aligned substantially parallel to the longitudinal direction of the busbars.
  • the at least one first and the at least one second connecting portion each extend parallel to one another and are arranged perpendicular to the at least one third connecting portion.
  • the first connection section is preferably arranged on a first side of the third connection section of the connection arrangement and the second connection section on a second side of the third connection section first side opposite. That is, the second connection portion is disposed at the third connection portion with about 180 ° rotated orientation with respect to the first connection portion.
  • the first and second connecting portions extend in different directions of the third connecting portion, respectively, but are aligned substantially parallel to each other.
  • the first and second connection portions are arranged on the third connection portion such that they are not aligned with each other.
  • the connection arrangement on individual solar cells according to the invention at the same place and yet to be able to connect a plurality of solar cells one behind the other to form a module without having to make a change in orientation to the solar cells themselves or to the connection arrangements on the solar cells.
  • the second connecting portion is preferably provided and adapted to be brought into electrically conductive connection with at least one busbar of an adjacent solar cell, said busbar preferably having a polarity corresponding to the polarity of the through first connection portion of the connection arrangement contacted busbars is opposite.
  • the second connection portion when the first connection portion contacts an n-busbar of a solar cell, the second connection portion is preferably arranged to contact a p-busbar of an adjacent solar cell. Accordingly, the second is
  • Connection section preferably provided to an n-busbar of an adjacent
  • the solar cell preferably has at least three busbars, wherein the first connection portion of the connection arrangement connects at least two busbars the same polarity of the solar cell together.
  • the first connection section it is also possible for the first connection section to contact only one busbar of a predetermined polarity if, in the presence of three busbars, there are not two identical busbars in this predetermined polarity in the solar cell.
  • the interconnection of several solar cells with three busbars is invariant with respect to a rotation of the individual solar cells by 180 °. This leads to a relief in the series connection of the individual solar cells to a solar cell module.
  • the first connection section and / or the second connection section of the connection arrangement are preferably dimensioned such that they span at least one busbar which they do not contact.
  • This non-contacted busbar is preferably a busbar with a polarity opposite to the polarity of the busbars to be contacted.
  • connection portions of the connection assembly preferably have a straight, elongated, rectangular shape.
  • connecting portions which are each arranged below each other in parallel.
  • first connection portions are arranged in parallel with each other
  • the plural second connection portions are arranged in parallel to each other
  • the plural third connection portions are arranged in parallel with each other.
  • first and second or third connecting sections can not be arranged parallel to one another but for example vertically.
  • the plurality of parallel connecting portions are preferably each arranged equidistantly.
  • the distances between the first connecting sections may differ from the distances between the second connecting sections.
  • connection arrangement has n first connection sections and n-1 second connection sections.
  • the second connection sections respectively engage in the gaps formed between the first connection sections of a subsequent solar cell device, so that the second connection sections of a first solar cell device are not in direct contact with the first connection sections of a second solar cell device.
  • the number of connection areas for selective contacting on the n-busbar preferably differs from the number of connection areas provided for selective contacting on the p-busbar.
  • so many connection areas are provided on the respective busbar, such as the connection arrangement has connection sections for contacting the corresponding busbars.
  • connection arrangement does not generate a short circuit between the n-contacts and the p-contacts, but can be electrically connected only by means of the busbars to be contacted, the connection arrangement is preferably opposite to the
  • Connection arrangement itself has an electrical insulation, or that the contact surface of the semiconductor of the solar cell has an electrical insulation layer.
  • connection arrangement may be embedded in a film that selectively enables electrical contact.
  • the third connection section is preferably located directly on one of the busbars of the solar cell.
  • “on is meant that the third
  • Connecting portion is arranged directly on the surface of the busbar.
  • the third connecting section in this advantageous embodiment is the
  • the third connection portion of the connection arrangement preferably contacts the busbar on which it is arranged selectively.
  • a connection can be created between the busbar to be contacted and the connection arrangement, which is realized not only by means of the first connection section or the second connection section (s).
  • the third connection section is not arranged on a busbar of the solar cell, but adjacent to an edge region of the semiconductor or of the solar cell.
  • the third connection section is adjacent to the actual solar cell, which is formed from the semiconductor, the electrical p-contacts and the electrical n-contacts as well as the associated busbars.
  • connection between the electrical contacts and the corresponding semiconductor regions is preferably realized by a point-like or a linear contact region.
  • a solar cell according to an advantageous embodiment of the invention more than 2 busbars. It is therefore particularly suitable as a large-scale solar cell with high power production, which can be made more technologically and cost technically cheaper than conventional solar cells with more than 2 busbars due to shortened electrical contacts.
  • a solar cell preferably has two p-busbars and one n-busbar or one n-busbar and two p-busbars.
  • a solar cell has two p-busbars and two n-busbars. It is likewise conceivable within the scope of the present invention for a solar cell to have more than two p-busbars and / or more than two n-busbars.
  • the busbars of the solar cell are preferably arranged substantially parallel to one another. This relates in particular to the longitudinal extension direction of the busbars, wherein individual areas of the busbars, which need not have a strictly rectangular shape, may deviate from a parallel arrangement.
  • a solar cell module having the features of claim 23.
  • Such a solar cell module consists of at least two solar cells according to claim 1.
  • each p-busbar or n-busbar of a first solar cell is preferably electrically conductively connected to each n-busbar or p-busbar of an adjacent solar cell by means of a connection arrangement.
  • connection arrangement in a solar cell module preferably has at least one first and second connecting section oriented substantially perpendicular to the busbars of the individual solar cells and at least one third connecting section aligned substantially parallel to the busbars and between two solar cells is arranged. That is, in this arrangement of the third connection portion of the connection arrangement, a busbar of one of the solar cells constituting the solar cell module is not directly contacted by the third connection portion, but only by the first and / or second connection portion.
  • connection arrangement for connecting two solar cells according to the invention with the features of claim 26.
  • a connection arrangement has at least one first or a second connection section which run parallel to one another.
  • at least one third connecting portion is provided, which extends substantially perpendicular to the first and the second connecting portion, wherein the first connecting portion for contacting a first solar cell and the second connecting portion for contacting a second solar cell, which is arranged adjacent to the first solar cell, provided and set up.
  • Such a connection arrangement can be subsequently applied, for example by a welding, soldering or gluing process, to an already existing solar cell in order to enable an electrical connection of this solar cell with an adjacent solar cell. It is in particular conceivable to produce the connection arrangement from a foil which mediates an electrical conductivity.
  • the first connection portion is disposed on a first side of the third connection portion of the connection assembly and the second connection portion is disposed on a second side of the third connection portion opposite to the first side.
  • the first connection section and the second connection section are arranged with a different orientation by 180 ° in each case at the third connection portion of the connection arrangement.
  • the first Connecting portion and the second connecting portion are preferably parallel to each other.
  • the first connection section and the second connection section are preferably arranged in the third connection section of the connection arrangement such that they are not aligned with one another.
  • the second connection portion of a first connection arrangement is not brought into electrical contact with the first connection portion of a second connection arrangement which is arranged on a solar cell, which is aligned adjacent to the solar cell on which the first connection portion is arranged ,
  • the first and / or the second connection section are preferably provided and arranged for contacting at least one busbar of the respective solar cell to be contacted.
  • the first connection section for contacting a busbar of a first solar cell and the second connection section for contacting a busbar of a second solar cell are provided.
  • a busbar in each case several busbars of the same polarity can be contacted on a solar cell and connected to one another.
  • connection sections preferably have a straight, oblong, rectangular shape.
  • connection arrangement in a preferred embodiment of the invention in each case a plurality of parallel first, second and / or third connecting portions, that is, the plurality of first connecting portions are each arranged parallel to each other, as well as the plurality of second and the plurality of third connecting portions are each arranged in parallel with each other.
  • the plurality of first connecting portions may be perpendicular to the be arranged a plurality of third connecting portions.
  • it is provided to provide a plurality of first and a plurality of second connecting portions and a single third connecting portion.
  • the plurality of parallel connecting portion are arranged in a preferred manner to each other in each case equidistant.
  • the distances between the first connection sections may differ from the distances between the respectively several second or, if appropriate, a plurality of third connection sections.
  • connection arrangement has n first connection sections and n-1 second connection sections.
  • connection arrangement it is possible for the connection arrangement to be arranged on solar cells to be contacted in such a way that the second connection sections in each case engage in the gaps formed by the spacings between the respective plurality of first connection sections so that the second connection sections of a first connection arrangement do not interfere with the first connection sections second connection arrangement come into contact when a plurality of solar cells, on each of which a connection arrangement is arranged, are connected in series with each other in series.
  • connection arrangement In order to interact only with the busbars to be contacted solar cells, but not cause short circuits between the electrical n-contacts and electrical p-contacts of a semiconductor of a solar cell, the connection arrangement preferably has at least partially an electrical insulation. This electrical insulation is in particular interrupted only at the points at which an electrical contact between the connection arrangement and a solar cell to be contacted is to be established, that is to say, in particular in the region of a busbar to be contacted of a solar cell.
  • FIG. 2 shows a view of the rear side of a solar cell
  • FIG. 3 shows a rear view of a first interconnection arrangement of two
  • FIG. 4 shows a cross section through a solar cell device
  • Figure 5 is a rear view of a second interconnection arrangement of two
  • FIG. 6 shows a rear view of a third interconnection arrangement of two solar cell devices to a solar cell module.
  • FIG. 1 shows a cross section through a solar cell 1 with a semiconductor 2, which has a textured semiconductor surface 3.
  • a first passivation layer 4 Above the textured semiconductor surface 3, a first passivation layer 4, and an antireflection layer 5 are arranged.
  • the textured semiconductor surface 3, the first passivation layer 4 and the antireflection layer 5 are located on the side or front side V of the solar cell 1 facing the light.
  • the surface of the solar cell can also be formed in another way.
  • the side of the solar cell 1 opposite the front side V is the side or rear side R of the solar cell 1 facing away from the light.
  • the side of the solar cell 1 opposite the front side V is the side or rear side R of the solar cell 1 facing away from the light.
  • the solar cell 1 has a dielectric second passivation layer 8, which prevents electrical contacting of the diffusion regions 6, 7 from the rear side R.
  • the solar cell 1 On the side of the second passivation layer 8 facing the rear side R of the solar cell 1, the solar cell 1 has electrical n-contacts 9 and electrical p-contacts 10 which pass through openings 11 as contact openings in the second passivation layer 8 with the corresponding p-doped diffusion regions 6 and n-doped diffusion regions 7 are electrically conductively connected.
  • the electrical contacts 9, 10 are usually designed as a contact fingers, as can be seen better in the following drawings. 2 shows a rear view of a solar cell 1, in which the finger-like structure of the electrical contacts 9, 10 can be well recognized.
  • the electrical contacts 9, 10 extend as interdigitated fingers (interdigitating) to the edge and in the middle of the solar cell arranged bus bars, the so-called busbars.
  • the solar cell 1 of Figure 2 two n-busbars 12, which are each arranged at the edge of the solar cell 1. With these n-busbars 12 all electrical n-contacts 9 of the solar cell 1 are connected. In the middle of the solar cell 1, a p-busbar 13 is arranged, with which the corresponding p-contacts 10 of the solar cell 1 are connected.
  • the busbars 12, 13 have a longitudinal direction L, which extends in the figure of Figure 2 from top to bottom or bottom to top.
  • the busbars 12, 13 have no strictly rectangular shape. Rather, the p-busbar 13 has a rhombic shape, while the n-busbars 12 are each configured slightly angled at their ends.
  • the busbars 12, 13 of the solar cell 1 are nevertheless aligned substantially parallel to each other.
  • the busbars may also be formed with another elongate shape, for example rectangular.
  • FIG. 3 shows a first embodiment of two solar cells 1 a, 1 b, which are interconnected to form a solar cell module.
  • the solar cells 1 a, 1 b - as shown in the figure 2 - shown by its back, so that you can see the finger-like electrical N and P contacts 9, 10.
  • the n-busbars 12 of a first solar cell 1 a which is shown on the right in FIG. 3, are interconnected to the p-busbar 13 of a second solar cell 1 b, which is shown on the left in FIG. 3, by means of a connection arrangement 14.
  • the solar cells 1 a, 1 b, which are connected by means of the connection arrangement 14, can be formed in accordance with FIGS. 1 and 2. However, differently shaped solar cells can also be connected by the connection arrangement 14. It is only necessary that both the emitter contact and the collector contact are formed on the back of the solar cell.
  • the solar cells can also be designed, for example, as emitter-wrap-through solar cells.
  • the connection assembly 14 has a shape of a two-piece pitchfork, which is arranged by the arrangement of three parallel aligned first connecting portions 141, a perpendicular thereto arranged third connecting portion 143 and two on the side of the third connecting portion 143 second connecting portions 142, which is opposite to the side, on which the first connection portions 141 are arranged on the third connection portion 143 is achieved.
  • the third connection section 143 of the connection arrangement 14 is arranged directly above one of the n-busbars of the first solar cell 1a and contacts it by means of three connection points 15.
  • the first connection sections 141 also contact the second n-busbar 12, the first solar cell 1a.
  • both n-busbars 12 of the first solar cell 1a are electrically connected to each other.
  • the connection arrangement 14 is designed to be electrically insulated from the aforementioned elements.
  • connection arrangement 14 The second connection sections 142 of the connection arrangement 14 are in contact via connection points 15 with the p-busbar 13 of the second solar cell 1b. This means that the connection arrangement 14 electrically connects the n-busbars 12 of the first solar cell 1a to the p-busbar 13 of the second solar cell 1b. Thus, the first solar cell 1 a and the second solar cell 1 b are interconnected in series.
  • connection arrangement 14 arranged on the underside of the busbars 12, 13 of the second solar cell 1 b is connected to the n-busbars 12 of the second solar cell 1 b in accordance with the connection arrangement 14 of the first solar cell 1 a and serves for further interconnecting the second solar cell 1 b with the second solar cell 1 b p-busbar another, not shown in the figure 3 solar cell.
  • connection arrangement 14 mediates an electrical connection of the first solar cell 1 a to the second solar cell 1 b, which extends substantially perpendicular to the longitudinal extension direction L of the busbars 12, 13 of the two solar cells 1 a, 1 b.
  • two p-busbars 13 and only one n-busbar 12 could alternatively be provided.
  • FIG. 4 shows a diagrammatic cross-sectional view of a solar cell 1 with a connection arrangement, for example, FIG. B. according to the figure 3, in which the light facing away from the back R of the solar cell 1 above and the light facing front side V of the solar cell 1 is arranged below.
  • the same reference numerals are used as in the previously explained figures.
  • the two n-busbars 12 arranged on the edge sides of the solar cell 1 as well as the centrally arranged p-type are shown on the back side of the semiconductor 2. Busbar 13 to see.
  • the section through the solar cell 1 is carried out at a point at which the n-busbars 12 are contacted by the finger-like electrical n-contacts 9.
  • the n-type electrical contacts 9 are not in direct electrical contact with the p-busbar 13 to prevent a short circuit.
  • a dielectric insulating layer 16 is applied to the busbars 12, 13 and the electrical contacts 9, 10, which cause undesired contact between the busbars 12, 13 and the electrical contacts 9, 10 with beyond the dielectric insulating layer 16 arranged elements prevented.
  • the connecting element 14 which is through holes 15 in the insulating layer 16, the connection points, in electrical contact with the n-busbars 12 of the solar cell 1.
  • connection point 15 in the dielectric insulating layer 16 would be correspondingly designed such that a contact between the connecting element 14 and the p -Busbar 13 of the solar cell would be possible, but not an electrical connection between the n-busbar 12 and the connecting element fourteenth
  • the insulating layer 16 may be arranged both directly under the connecting element 14 on the back R of the solar cell 1 and be part of the connecting element 14.
  • FIG. 5 shows a second exemplary embodiment of a connection of two solar cell devices to a solar cell module.
  • the known reference numerals are used for already introduced elements.
  • a difference from the embodiment shown in Figure 3 is that the third connecting portion 143 of the connecting element 14 is not disposed on one of the n-busbars 12 of the solar cell 1 a, 1 b, but in a gap between the first solar cell 1 a and the second solar cell 1 b is located.
  • the third connection section 143 no longer contacts the n-busbar 12 of the first solar cell 1a directly.
  • the three mutually parallel first connection sections 141 of the connection arrangement 14 contact both n-busbars 12 of the first solar cell 1a equally via contact points 15. These contact points 15 respectively.
  • Connecting areas for punctiform contacting are formed in the areas where the first connecting portions 141 overlap with the n-busbars. They do not necessarily have to fill the entire overlap area, but can only be formed in a partial area of the overlapping area between the first connecting sections 141 and the n-busbars 12.
  • the number of contact points 15 corresponds to the number of connecting portions 141, 142, 143, which are contacted by the corresponding connecting element 14.
  • the number of contact points 15 on the n-busbars 12 differs from the number of contact points on the p-busbars, which is reflected in an asymmetrical configuration of the connecting element 14.
  • the first connection sections 141 each have a length which enables them to contact both n-busbars 12 arranged at the edge regions of the first solar cell 1a and at the same time to span the centrally arranged p-busbar 13 without contacting it.
  • insulation required for this purpose between the connection arrangement 14 and the electrical contacts 9, 10 and the busbar 13 of the solar cell 1a not to be contacted reference is made to the representation of FIG.
  • the second connection sections 142 which are connected to the third connection section 143 of the connection arrangement 14 as well as the first connection sections 141, span the non-contact n-busbar 12 of the second solar cell 1 b, and then connect the p-busbar 13 to the connection points 15 second solar cell 1 b to contact.
  • the contact points 15 between the two mutually parallel second connecting elements 142 and the p-busbar 13 of the second solar cell 1 b are equivalent to the connection points 15 between the first connecting portions 141 and the n-busbars 12 of the first solar cell 1 a configured.
  • FIG. 6 shows a third exemplary embodiment of an interconnection of two solar cell devices to form a solar cell module.
  • the first solar cell 1 a and the second solar cell 1 b of the arrangement illustrated in FIG. 6 each have two n-busbars 12 and two p-busbars 13.
  • the connecting elements 14 have in this embodiment, four first portions 141 and three second portions 142 and a third portion 143. This is due in particular to the somewhat wider version of the solar cells.
  • three first Insert connecting portions 141 and two second connecting portions 142 or provide a different number of connecting portions.
  • the first connection sections 141 contact the two n-busbars 12 of the first solar cell 1 a, thereby spanning one of the two p-busbars 13 of the first one without contact
  • the three second connection sections 142 of the connection arrangement 14 moreover contact the two p-busbars 13 of the second solar cell 1 b, thereby spanning one of the two n-busbars of the second solar cell 1 b without contact.
  • the third connection portion 143 on the first side of which the first connection portions 141 and on the second, the first opposing side, the second connection portions 142 are arranged and thus connects the first connection portions 141 with the second connection portions 142 is - as in the embodiment of Figure 5 - arranged between the two solar cells 1 a and 1 b. That is, even in the embodiment of FIG. 6, the third connection section 143 does not directly contact a busbar 12, 13 of one of the two solar cells 1 a, 1 b.
  • the second connection portions 142 are disposed on the third connection portion 143 so as not to be flush with the first connection portions 141, but rather are arranged in a central position between two first connection portions 141. Thereby, they can be introduced into the gap existing between two first connection portions 141 of the connection assembly 14 on the second solar cell 1b.
  • the second connection portions 142 of the connection assembly 14 of the first solar cell 1a do not contact the first connection portions 141 of the connection assembly 14 of the second solar cell 1b even if such contact were possible due to the longitudinal extension of the first connection portions 141 and second connection portions 142, respectively.

Abstract

L'invention concerne un système à cellule solaire comprenant : une cellule solaire (1) présentant un semi-conducteur (2) ayant une région dopée p (6) et au moins une région dopée n (7), des contacts p électriques (10) disposés sur une face arrière (R) de la cellule solaire (1), et des contacts n électriques (9) qui sont connectés avec les régions dopées correspondantes (6, 7) du semi-conducteur (2), au moins une barre bus p (13) qui est connectée avec les contacts p électriques (10), et au moins une barre bus n (12) qui est connectée avec les contacts n électriques (9), lesdites barres bus (12, 13) collectant respectivement le courant des contacts électriques (9, 10) et présentant une direction d'extension longitudinale (L), ainsi qu'un dispositif de jonction (14) qui est configuré pour la jonction électroconductrice d'au moins l'une des barres bus (12, 13) de la cellule solaire (1) avec au moins une barre bus (13, 12) d'une cellule solaire adjacente. L'invention est caractérisée en ce que le dispositif de jonction (14) présente au moins une première section de jonction (141) s'étendant sensiblement perpendiculairement à la direction d'extension longitudinale (L) des barres bus, ladite section étant raccordée ponctuellement avec les zones de jonction (15) au moyen d'au moins une barre bus (12, 13). L'invention concerne également un module de cellule solaire comprenant au moins deux systèmes à cellule solaire. En outre, l'invention concerne un dispositif de jonction (14) pour le raccordement de deux cellules solaires.
EP08717755A 2007-03-19 2008-03-13 Système à cellule solaire, module de cellule solaire et dispositif de jonction Withdrawn EP2130232A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007013553A DE102007013553A1 (de) 2007-03-19 2007-03-19 Solarzellenvorrichtung, Solarzellenmodul und Verbindungsanordnung
PCT/EP2008/053011 WO2008113741A2 (fr) 2007-03-19 2008-03-13 Système à cellule solaire, module de cellule solaire et dispositif de jonction

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EP2130232A2 true EP2130232A2 (fr) 2009-12-09

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US (1) US20100139746A1 (fr)
EP (1) EP2130232A2 (fr)
DE (1) DE102007013553A1 (fr)
WO (1) WO2008113741A2 (fr)

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WO2008113741A2 (fr) 2008-09-25
US20100139746A1 (en) 2010-06-10
DE102007013553A1 (de) 2008-09-25

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