WO2011020205A1 - Device and method for contacting silicon solar cells - Google Patents

Device and method for contacting silicon solar cells Download PDF

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Publication number
WO2011020205A1
WO2011020205A1 PCT/CH2010/000202 CH2010000202W WO2011020205A1 WO 2011020205 A1 WO2011020205 A1 WO 2011020205A1 CH 2010000202 W CH2010000202 W CH 2010000202W WO 2011020205 A1 WO2011020205 A1 WO 2011020205A1
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WO
WIPO (PCT)
Prior art keywords
contact
solar cell
characterized
back
electrically conductive
Prior art date
Application number
PCT/CH2010/000202
Other languages
German (de)
French (fr)
Inventor
Arthur BÜCHEL
Christophe Ballif
Original Assignee
X-Cells S.A.
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
Priority to CH1296/09 priority Critical
Priority to CH01296/09A priority patent/CH701679A1/en
Application filed by X-Cells S.A. filed Critical X-Cells S.A.
Publication of WO2011020205A1 publication Critical patent/WO2011020205A1/en

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and 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 peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/0224Electrodes
    • H01L31/022408Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and 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 peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/02002Arrangements for conducting electric current to or from the device in operations
    • H01L31/02005Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier
    • H01L31/02008Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier for solar cells or solar cell modules
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and 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 peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/0224Electrodes
    • H01L31/022408Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H01L31/022433Particular geometry of the grid contacts
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and 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 peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and 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 peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042PV modules or arrays of single PV cells
    • H01L31/05Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

A solar cell (101), preferably a crystalline solar cell, comprising a front face contact and a rear face contact, has a front face comprising a plurality of contact fingers (105) which are mutually spaced, preferably parallel to each other and in electrically-conductive contact with a first electrically conductive layer on the front face of the solar cell. Said front face also comprises a plurality of contact webs (103) which are likewise mutually spaced, preferably parallel to each other and run substantially perpendicular to the contact fingers (105) and are in electrically-conductive contact with same and with the electrically conductive layer. The ends of the contact webs (103) or electrically conductive contact elements (113) in contact with the contact webs lead onto the rear face of the solar cell and abut same. Insulation (117) separates the ends of the contact webs (103) or the electrically conductive contact elements in contact with the contact webs from the electrically conductive layer of the rear face of the cell.

Description

 Device and method for contacting silicon solar cells

 This present invention relates to an apparatus and a method for contacting silicon solar cells.

State of the art

 For contacting silicon solar cells is commonly used today on the

Cell front side applied a contact grid by screen printing on the solar cell. A typical arrangement of this grid is shown in FIG. It consists on the one hand of fine contact fingers 105, which are arranged at intervals of a few millimeters parallel to each other over the entire cell surface and contact webs 103, usually about 2 mm wide, which serve to collect the currents of the individual contact fingers. Commercially available

Solar cells with edge dimensions of max. 175 mm usually have two spaced apart contact webs. Between the contact webs is usually a distance of 50 to 80 mm. At each contact bridge a soldering tape is soldered, which serves to dissipate the current. The current flows along the soldering tape, which is connected to the back of the adjacent cell (series connection). This technique is common. It works, but has several limitations. Thus, on the one hand by the width of the contact webs 103, typically 2mm, shadowed the underlying cell surface. Furthermore, the current density in the narrow contact fingers 105 is high, resulting in significant losses. In addition, the metallic contact paste on the surface, which is in direct contact with the semiconductor, reduces the open circuit voltage of the solar cell.

To improve these limitations, several expensive methods have already been developed.

a) "Laser-Burried Contact": In this process, the screen printing process is replaced by

Bestätigungskopte a combination of a laser process (ablation of a deep but narrow strip on the surface of the wafer) and a plating process to metallize the exposed area. This method requires adjustment of process control in cell manufacturing and additional process steps that increase the cost of cell manufacturing.

b) Cell processes for back contact: Another way to avoid the previously described losses is a cell contacting arrangement on the back of the cell. This can be achieved by means of a "wrap-through" method, which generates a pattern of holes on the solar cell and conducts the current through these holes in the solar cell to the back

Additional effort to create the holes in the cell and for the via, but is currently used by several companies.

 Another possibility of backside contacting is the deposition of the doped layers on the backside of the cell. One of the advantages of this method is that the entire cell front can be exposed to the radiation. However, a litigation is necessary that allows a very precise structuring of those areas that are considered positive and negative to be doped. Also, the application of the contact on the back must take place in accordance with precise. This adds significantly to the complexity and causes considerable extra manufacturing costs.

c) contacting by wire mesh is another method that is already in use. Here a wire mesh is first applied to a transparent carrier layer, for example EVA. Subsequently, the carrier together with the wire grid on the solar cell

applied.

Such a method is disclosed, for example, in US 2005/0241692. US 2005/0241692 describes an electrode for contacting an electrically conductive surface of a photovoltaic cell. The electrode comprises an insulating, optically transparent film, an adhesive layer on one side of the transparent film and a A plurality of substantially parallel, electrically conductive first wires embedded in the adhesive layer. A part of the wire surface still protrudes from the

Adhesive layer out. The wires are provided with a low melting alloy to electrically connect them to a first contact pad and to the electrically conductive surface of the photovoltaic cell. The contact strip is next to the

Photovoltaic cell arranged so that no shading caused by this. The described electrode can be produced as an endless strip, which can be cut to the desired length. Usually, a plurality of substantially parallel, electrically conductive second wires are applied to the first wires such that a wire grid is formed. The content of US 2005/0241692 is hereby incorporated by reference into the present application.

Furthermore, US Pat. No. 6,156,967 A shows a radiation insensitive

Solar cell arrangement for space applications. There are two

opposite end of the cells contacted by a single electric

Contact web is guided from the front of the solar cell to the back, to be subsequently contacted on the back with a metal strip with a very low expansion coefficient. Also, the front side contact is guided only at one point on the back of the cell.

US Patent 4,289,920 A describes a tandem cell contacting in which electrical contact is made from the backside cell to the cell on the front side.

Object of the invention

 Based on this prior art, the object of this invention is the

Contacting the solar cells with limited adaptations to the classical ones

Significantly improve cell production process. This improvement is to be achieved without the disadvantages of the already known methods would have to be accepted. In particular, it is an aim to simplify the contacting of the cells. Another goal is to minimize the shading of the cells by contacting them.

description

 The present invention relates to a solar cell having a front side with a plurality of spaced apart, preferably parallel, contact fingers, which are in electrically conductive contact with a first electrically conductive layer on the front side of the solar cell. A plurality of at least two spaced apart, preferably parallel contact webs extend substantially perpendicular to the

Contact fingers and are in electrically conductive contact with these and preferably the electrically conductive layer. The back side of the solar cell has a second electrically conductive layer.

The solar cell according to the invention is now characterized in that contact strips are used as contact webs, which are arranged at a distance of <30 mm from each other, and that the contact strips are guided at least on one side to the back of the solar cell and abut against this, wherein. an insulation provided between the ends of the contact bands and the second electrical layer separates them from the electrically conductive layer of the cell backside. The solar cell according to the invention has the advantage that the conduction losses are reduced in the only thinly formed contact fingers, since the contact strips are arranged at a significantly closer distance from one another than the contact webs in conventional solar cells. Another advantage is that the contact ends of the contact strips of the front side are folded on the back and the current discharge takes place on the back of the cell. Due to the proposed isolation is a short circuit between the electrically conductive layer of the back and the

Contact ends excluded. One advantage is that in cell production lines only the screen printing process for front metallization has to be adapted in order to be compatible with the invention. Another advantage is that the solar cells after contacting Less sensitive to microcracks in the cell and also the risk of breakage of the cells is reduced, whereby the yield in the module manufacturing process is significantly increased. An additional advantage - for example, in comparison to the aforementioned US 2005/0241692 - is the fact that with this invention, the current can be dissipated on both sides of the solar cell and a series connection is possible without additional space. Furthermore, in this invention, in contrast to the aforementioned US 2005/0241692 no carrier film for applying the contact webs on the cell is necessary.

Advantageously, both ends of the contact bands are guided on opposite sides to the back of the solar cell. By the current discharge to each other

opposite sides of the solar cell, the width of the contact strips can be significantly narrower than the conventional contact webs. If power is dissipated on both sides, the width of the contact strips can be halved with approximately the same line losses. Narrower contact bands also have the advantage that the solar cell is less shaded.

Contact strips of a width <0.7 mm or wires of a diameter <0.5 mm are advantageously used. Such contact bands have a sufficiently low

Line resistance to dissipate the electrical energy produced by the cell loss as possible. If flat contact bands are used, they preferably have a minimum thickness of at least 50 micrometers (μm), preferably> 70 μm, and more preferably> 80 μm. The upper limit for the strength of the

Contact bands is at most 150 microns, preferably at most 130 microns and more preferably at most 120 microns. In principle, additional contact webs are provided. In this case, the contact webs are over substantially the entire length with the

Contact bands contacted and in electrically conductive contact with these. This means that, in principle, conventional solar cells, which usually have only two contact webs, can additionally be contacted with contact strips. According to a preferred embodiment, contact strips are provided as electrically conductive contact elements which are contacted on the front side of the cell with the contact webs and on the back side of the cell with current collecting strips.

Advantageously, an insulation layer is provided either at the ends of the contact strips or at an edge zone on the back as insulation. The isolation can basically be carried out in different ways. Of importance is only that between the front of the cell and the back of a short circuit is avoided. A

Embodiment therefore provides the contact ends with an insulating

Protective jacket to provide. According to another embodiment, it is provided that an insulating layer is provided on two opposite edge zones on the back of the solar cell, and that the ends of the contact strips and / or electrically conductive contact elements in contact with the contact webs on opposite sides of the back of the solar cell are guided. The ends of the contact strips can thus be arranged on the insulating layers. The

Insulation layer may be an electrically non-conductive film, a paint or a vapor-deposited or sputtered layer.

According to a preferred embodiment, the ends of the contact strips are connected to a contact strip for the purpose of current discharge and forwarding. Of the

Contact strip can be arranged so that either a serial or a parallel connection of adjacent cells is realized. Conveniently, the length of the contact strips corresponds to the width of the solar cell plus the length that is necessary for the folding on the back, plus the necessary length for contacting with the

Contact elements.

The serial or parallel connection of the cells can be accomplished in two ways. In a first variant is on the back of the solar cell an insulating Kontaktierungsfolie applied with integrated tracks, which contains tracks for power dissipation. The connection of the conductor tracks with the contact ends of the contact strips can be effected by means of soldering or gluing.

In a second variant, the contact bands, which may be partly associated with the contact webs, are electrically connected to the next solar cell by further flat contact strips or contact wires. The contact element itself may be formed by a contact strip, which has a sufficient length for series or parallel connection with the next solar cell. This variant has the advantage that no separate film is necessary. However, it must be ensured that both contact webs, contact elements or contact bands and contact connections are electrically isolated from the back of the solar cell.

According to an advantageous embodiment, contact strips of a width <0.7 mm or wires of a diameter <0.5 mm are used. The use of very narrow contact bands or wires of a small diameter has the advantage that the

Shading of the cells is reduced to a minimum. Conveniently, the

Contact straps or wire at a distance <30 mm from each other.

The use of contact strips of width <0.7 mm or wires of diameter <0.5 mm has the advantage that the shading of the cell is reduced to a minimum, so that the current efficiency can be higher than with conventional cells. The reduction of the metallized area of the cell surface further has the advantage that this can additionally lead to an increase in the open circuit voltage of the cell, which results in a further gain in the efficiency. In addition, the losses in the company are reduced

Current dissipation due to the smaller distances between the contact webs compared to conventional cells. This also leads to a considerable improvement in the fill factor of the solar cell. A preferred variant provides a power drain on two opposite sides of the cell. The removal of the current on both sides of the cell allows a halving of the cross section of the contact webs, whereby the covered cell surface is reduced accordingly. Further advantageous embodiments of the cell have already been discussed above.

The subject of the present invention is also a solar cell arrangement or module with a plurality of juxtaposed solar cells according to one of claims 1 to 15, characterized in that a plurality of juxtaposed solar cells covering contacting foil of an electrically insulating material and with first and second integrated conductor tracks is applied to the solar cells, which are in electrically conductive contact with the ends of the contact webs and / or in communication with the contact webs electrically conductive contact elements and the electrically conductive back of the solar cell. The inventive

Solar cell arrangement has the advantage that only the screen printing process for

Front metallization must be adapted to be compatible with the invention. In addition, the cells can be arranged close to each other, since the current discharge takes place on the back of the cell. By using a single contacting foil, electrical contact can take place both to the cell front side and to the cell rear side. The first and second conductor tracks can be arranged so that the solar cells arranged one behind the other are connected in parallel or in series.

The previous contact can be used both on the front side of the solar cell, but is also advantageous on the back, if the back is made transparent, which is the case with bi-facial cells. In this case, the

Contact bars applied, but not folded on the opposite side.

An advantageous embodiment provides that the first interconnects with the ends of the contact strips of a first solar cell and with the back of an adjacent second solar cell, and the second interconnects of said first solar cell with their Back and with the Kontaktbändem the second adjacent solar cell in electrically conductive contact. In this way, a series Verschaitung the cells is realized in a simple way.

The present invention also provides a process for producing a solar cell according to the preamble of claim 23, which is characterized in that ends of the contacting grid are guided on the back side of the solar cell and isolated from the electrically conductive rear side. This method has the advantage that the current is discharged from the front of the cell and the back of the cell on the back of the solar cell.

The invention will now be described by way of example with reference to the figures. It shows:

Figure 1: Schematically the structure of a solar cell;

 Figure 2: schematically the conventional contacting of a crystalline

 Silicon solar cell with a plurality of each other

 spaced, parallel contact fingers and two about 2 mm

 wide contact webs which are perpendicular to the contact fingers

 run;

Figure 3: schematically a likewise known contact, whose

 Contact webs, however, only about half the width of

 Contact webs of Fig. 1 have;

Figure 4: Schematically in plan view a first embodiment of a

 Solar cell according to the invention with a contact with

 Contact webs, which are a much smaller distance

 have from each other as the known examples according to

 Figure 1 or 2;

 Figure 5: the embodiment according to Figure 4 with contact strips, the

 are soldered to the contact bridges and in side view the

Arrangement before soldering the contact strips, consisting of cell and contact strips;

Figure 6 a, b: Schematically, the solar cell with the on the cell

 protruding ends of the contact strips and a

Insulation film, which under the ends of the

Contact ribbon is arranged, in top view and

Side view;

Figure 7 a, b: schematically a bottom view (a) and a side view of

 Solar cell of Figure 5, wherein the ends of the contact strips are folded on the back with a transverse to the

 Contact strips extending contact strips are connected;

Figure 8: in plan view a film for back contact with

 Contacting points used to connect to the cell;

FIG. 9 shows the structure of the metallic intermediate layer of FIG

 Backsheet with tracks for series connection several

cells;

FIG. 10 shows schematically the rear side of an arrangement of 6 solar cells, which are connected in parallel;

Figure 11: schematically an arrangement of 3 in a row

switched solar cells (series connection).

FIG. 1 shows schematically the structure of a solar cell. Such a cell consists of an approximately 0.2 mm thick p-type Si substrate on which a sub-micron thick n-layer is applied. In the case of the monocrystalline silicon solar cell, the n-layer is produced by the introduction of phosphorus atoms into the p-material near the surface. The n-type layer is so thin that the sunlight in the space charge zone is absorbed at the p / n junction. The p-material, in turn, must be thick enough to penetrate deeper

To be able to absorb sun rays and to give the solar cell the mechanical stability. On the back usually an electrically conductive layer is applied, and on the front contact fingers 105 are provided to dissipate the current. The contact fingers 105 should be as narrow as possible in order to keep the shading of the cell by the contact tracks low.

The invention consists of a novel contact, extending through several

distinguishes advantageous features. It consists of several, i. more than 3 narrow (<0.5mm) contact strips 113 or wires spaced 111 (<30mm) apart

are arranged from each other, as shown in Figure 4. Compared to

Conventional solar cells are thus at least 3, preferably more than four, and more preferably more than 5 contact bands per solar cell surface of known square solar cells, which have an edge length of 175 or 125 mm. The contact strips 113 are designed so that the cell current can be dissipated at both ends of the contact strips 113 (FIG. 5). The metallic contact strips 113, typically of copper, are pre-tinned and are heated to be applied to the solar cell until the solder becomes liquid and then soldered to the metallic cell surface. The adhesion between ribbon 113 and solar cell surface can be optimized by the use of a flux. Alternatively, a conductive adhesive may be used. The contact strips 113 are then folded around the side edges around on the back of the solar cell (Figure 7). To prevent short circuits between the cell back and the front of the cell, an electrical Insulation layer 117 applied to the cell back (Figure 6). The insulation may for example consist of a non-conductive and temperature-resistant adhesive tape, for example Kapton tape, which is glued to the contact strips before the contact strips are folded onto the back of the solar cell. The Kapton tape can also be attached to the cell surface. Instead of an insulating tape, a non-conductive layer (for example, a temperature-resistant insulating varnish) may be applied to the back of the cell in the area of the contact strips 113. if the

Cell edge isolation by laser, that is, the electrical separation of the

Cell front, on the cell front side (i.e., on the edge of the cell front), it is advantageous to also insulate the cell face to avoid short circuits. The contact strips are then connected to a pre-tinned ribbon 119, which serves as a current collecting strip. For efficient contacting and series connection of the solar cells, a rear side foil 121 is advantageous, which consists of at least one structured metal layer, as shown for example in Figure 9 and an insulating film 117 between solar cells and metal layer, as shown in Figure 8, with contact points 123 to electrical connection of the cells.

The cells are laid parallel to one another in rows with a small spacing for connection to the backsheet, as shown in FIG. Subsequently, the Rückseitungskontaktierungsfolie 121 is placed on the cells and the electrical

Series connection of the solar cells contacting by means of soldering to the

Contact points 123 and 147 carried out (Figure 10). This contacting can also be carried out by means of welding, a conductive adhesive or another method.

But it is also possible, the contact strips 113 directly with the

To connect back side contacting film, if the contacting compounds and Contact points are adjusted accordingly.

Alternatively, the connection between the contact strips 113 may be made as shown in FIG. In this case, no backsheet is necessary. However, an additional insulation layer in the region 153 is required in order to avoid short circuits between the current collector strips 155, 157 and the cell backside.

Legend

 101 solar cell (preferably crystalline)

 103 contact bridges

 105 contact fingers

 111 Distance between contact strips

 113 contact strips

 115 pressure plate

 117 insulation layer

 119 contact strip / pre-tinned ribbon

 121 Backsheet with contact points

 123 contact points

 125 Backsheet with conductor connections in intermediate layer

127, 129, conductor connections on the backsheet for series connection of the

 solar cells

131, 133, conductor connections on backside foil for series connection of the

 solar cells

135, 137, conductor connections on backsheet for series connection of the

 solar cells

143 solar cell with applied Kontaktieruhg

 151, 155, 157 contact bands

153 insulation film

Claims

Claims:
1. solar cell (101) with
 - A front with a plurality of spaced apart, preferably parallel contact fingers (105) which are in electrically conductive contact with a first electrically conductive layer on the front side of the solar cell, and a plurality of likewise spaced apart, preferably parallel
 Contact webs (103) which are substantially perpendicular to the contact fingers (105) and in electrically conductive contact with these and the electrically conductive layer, and
 a backside with a second electrically conductive layer,
 characterized in that
 that contact strips (113) are used as contact webs (103), which in one
Distance (111) <30 mm from each other, and
 that the contact strips (113) are guided on the back of the solar cell and abut against this, and
 that between the ends of the contact strips (103) and the second electrically conductive
Layer of the cell back insulation (117) is provided.
2. Solar cell according to claim 1, characterized in that both ends of the
 Contact strips (113) are guided on opposite sides to the back of the solar cell.
3. Solar cell according to claim 1 or 2, characterized in that contact strips (113) of a width <0.7 mm or wires of a diameter <0.5 mm are used.
4. Solar cell according to one of the preceding claims, characterized in that the contact bands (113) have a minimum thickness of> 50 micrometers (μm), preferably> 70 μm, and particularly preferably> 80 μm.
5. Solar cell according to one of the preceding claims, characterized in that in addition contact webs (103) are provided, and that the contact strips (113) are applied to the contact webs (103) and in electrically conductive contact therewith.
6. Solar cell according to one of the preceding claims, characterized in that the ends of the contact strips (113) for the purpose of current dissipation with current collecting strip (121) are connected.
7. Solar cell according to one of the preceding claims, characterized in that on the back of the solar cell an insulating contacting film with
 Applying conductor tracks, integrated Stromomsammeistreifen (125) is applied, which serve tracks of the current dissipation.
8. Solar cell according to claim 7, characterized in that on the
 Stromomsammeistreifen (125) individual contact points (123) are provided, which are formed from a low-melting solder or an electrically conductive adhesive.
9. Solar cell according to one of the preceding claims, characterized in that an insulation layer (117) is provided either at the ends of the contact webs and / or the contact elements or at an edge zone on the back as insulation.
10. Solar cell according to one of the preceding claims, characterized in that at least one edge zone on the back of the solar cell, which is transverse to the Longitudinal extension of the contact strips (113) extends, is provided with an insulating layer (117),
11. Solar cell according to one of the preceding claims, characterized in that at two opposite edge zones on the back of the solar cell depending on an insulation layer (117) is provided, and
 the ends of the contact strips (113) are guided on opposite sides to the rear side of the solar cell so that the ends of the contact webs or the electrically conductive contact elements which are connected to the contact webs are arranged on the insulating layers.
12. Solar cell according to one of the preceding claims, characterized in that the length of the contact strips (113) of the width of the solar cell plus the length, which is necessary for the folding on the back, plus the necessary length for the
 Contacting with the contact elements corresponds.
13. Solar cell according to one of the preceding claims, characterized in that the contacting of the solar cell with the contact strips (113) and the subsequent interconnection of the bands (119, 151, 155, 157) is realized by a Lötververbindung or electrically conductive adhesive bond.
14. Solar cell arrangement with a plurality of juxtaposed
 Solar cell arrangement having a plurality of juxtaposed solar cells according to one of claims 1 to 16, characterized in that the cells are electrically connected to one another by means of current collecting strips (119).
15. Solar cell arrangement according to claim 14, characterized in that as
Strommasististreifen a covering contacting foil (125) of a electrically insulating material and with first and second integrated conductor tracks (132, 133) being applied to the solar cells, which are in electrically conductive contact with the ends of the contact strips (113) or the electrically conductive rear side of the solar cell.
16. Solar cell arrangement according to claim 15 or 16, characterized in that the first and second conductor tracks (132, 133) are arranged such that the solar cells arranged one behind the other are connected in parallel with one another.
17. Solar cell arrangement according to claim 15 or 16, characterized in that the first and second conductor tracks (132, 133) are arranged so that the solar cells arranged one behind the other are connected in series with one another.
18. Solar cell arrangement according to one of claims 14 to 17, characterized in that the first conductor tracks (132) with the contact strips (103) of a first
 Solar cell and with the back of an adjacent second solar cell, and
 the second interconnects of said first solar cell are in electrically conductive contact with the rear side thereof and with the contact bands of the second adjacent solar cell.
19. Solar cell arrangement according to one of claims 14 to 18, characterized in that the contact strips (151, 155, 157) are designed so that they can be connected to the back of the next cell, without a short circuit on the
 Cause cell back.
20. A method for producing a solar cell, wherein said method applied at least on the cell front side of a contacting grid and the cell front side and the cell back contacted with an electrical conductor for the purpose of current dissipation become,
 characterized,
 in that the contacting takes place on the rear side, by guiding the front cell contacting grid around the side edges onto the rear side of the solar cell and isolating it from the electrically conductive rear side.
21. The method according to claim 21, characterized in that the current on the
 Cell back is removed by the cell front and back of the cell are contacted with current collection lists on the back of the cell.
PCT/CH2010/000202 2009-08-19 2010-08-19 Device and method for contacting silicon solar cells WO2011020205A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH1296/09 2009-08-19
CH01296/09A CH701679A1 (en) 2009-08-19 2009-08-19 Device and method for the contacting of silicon solar cells.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20100752516 EP2467879A1 (en) 2009-08-19 2010-08-19 Device and method for contacting silicon solar cells

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Publication Number Publication Date
WO2011020205A1 true WO2011020205A1 (en) 2011-02-24

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CH (1) CH701679A1 (en)
WO (1) WO2011020205A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
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