WO2009156086A2 - Solar cell and method for producing a solar cell - Google Patents

Solar cell and method for producing a solar cell Download PDF

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Publication number
WO2009156086A2
WO2009156086A2 PCT/EP2009/004380 EP2009004380W WO2009156086A2 WO 2009156086 A2 WO2009156086 A2 WO 2009156086A2 EP 2009004380 W EP2009004380 W EP 2009004380W WO 2009156086 A2 WO2009156086 A2 WO 2009156086A2
Authority
WO
WIPO (PCT)
Prior art keywords
solar cell
contact fingers
characterized
wires
cell according
Prior art date
Application number
PCT/EP2009/004380
Other languages
German (de)
French (fr)
Other versions
WO2009156086A3 (en
Inventor
Patrik MÜLLER
Original Assignee
Gebr. Schmid Gmbh & Co.
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 DE102008030262.7 priority Critical
Priority to DE200810030262 priority patent/DE102008030262A1/en
Application filed by Gebr. Schmid Gmbh & Co. filed Critical Gebr. Schmid Gmbh & Co.
Publication of WO2009156086A2 publication Critical patent/WO2009156086A2/en
Publication of WO2009156086A3 publication Critical patent/WO2009156086A3/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
    • 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

The invention relates to a solar cell comprising front contacts on a front side, for collecting electrons, and a connection device for connecting to the front contacts. The front contacts are in the form of thin contact fingers, different lengths of connection wires leading from the contact fingers to the connection device. Different lengths of the connection wires extend from the connection device to at least one contact finger. Almost all of the longer connection wires are electrically connected several times, along the course or the length thereof, to different contact fingers.

Description

Description of solar cell and method of manufacturing a solar cell

Application and state of the art

The invention relates to a solar cell having front contacts on its front side and a method of manufacturing such a solar cell.

Ordinarily, solar cells, which are constructed of a silicon wafer, so-called back contacts on its rear side and on its front so-called front contacts. This front contacts were, collect the electrons and direct them to a connection device on. Such connection means may be an electrical connector for forwarding the current or another corresponding solar cell in a series circuit. In order to keep the shading low as possible, the front contacts in the form of thin contact fingers are formed, which are usually arranged in parallel and equidistantly to each other to extend in the front. Flat wires are commonly provided In order to join the front contacts to the connection means that are electrically connected to each of the front contacts, protrude over the solar cell side and are connected to the connecting device. The shading of these known flat wires but is considered negative because it degrades the active area of ​​the solar cell and thus its efficiency.

Problem and Solution

The invention has for its object to provide an aforementioned solar cell as well as a suitable method for their preparation a with which the disadvantages of the prior art can be reduced, and in particular the efficiency or the yield of a solar cell can be increased. This object is achieved by a solar cell with the features of claim 1 and a method for their production with the features of claim 14. Advantageous and preferred embodiments of the invention are subject matter of further claims and are explained in more detail below. Furthermore, the wording of the priority application DE 102008030262.7 is made on 18 June 2008 by the same applicant by express reference herein. The wording of the claims is incorporated by express reference to the content of the description.

According to the invention, various types of long connection wires are led from the contact fingers of the front contacts to the connection device. This leads running in different lengths of the connecting device, to one or a few contact fingers. At least some, preferably most, connecting wires across multiple electrically connected in their course or along its length with the contact fingers. This means that they are multi-connected in their longitudinal course of several contact fingers. Preferably, the distance in which a lead wire is connected to a contact finger and connected to this lead wire always the same, this can be particularly advantageous for several or even all connecting wires are.

Thus, the possibility is created with the invention is to provide a plurality of connecting wires of the contact fingers as the front contacts to a terminal device. Due to the different length of lead wires, which all lead to the connecting device is achieved that go to the remotest contact fingers a few leads. The closer the contact fingers lie on the connecting device, the more leads are available to transport the electrons to the terminal device, ie to conduct electricity. In essence, therefore, an approximately inverted Ii can nearer relationship between distance of a contact finger of the connecting device and available stationary conductor cross section can be achieved. So this means that all of the available conductor cross-section increases the closer the contact fingers are held by the connecting device. This makes it possible account of the fact, as has been proven advantageous within the scope of the invention that the current flow is getting bigger, the closer a contact finger is the connecting device. It is thus made to conform to the prevailing or expected current exactly the conductor cross-section required for this are available, but also can not be so shielded by conductor surface of the front of the solar cell is reduced or reduced to a mandatory required minimum.

In an advantageous embodiment of the invention the front contacts run parallel to each other and at equal intervals. Particularly advantageously, the connecting wires extend accordingly at right angles to the front contacts or contact fingers. This causes in addition to a simpler production and a reduced length as possible, and thus blockage of the connection wires of the solar cell. Also, the lead wires advantageously extend parallel to one another and particularly advantageous at the same distance.

In a further embodiment of the invention may be provided that a connecting wire is connected respectively every three to six contact fingers with the front or one of these contact fingers of the solar cell or connected thereto. Particularly advantageous in each case all of these three contact fingers can be contacted. This interval is advantageous for one connecting wire always the same, especially advantageous for all the wiring connectors of this length or possibly total for all leads. Adjacent lead wires are advantageously connected to respective different contact fingers. To enable the best possible power line and simultaneously to reduce the number of connections of the connection wires with contact fingers, it is possible to provide hunt groups which connect two to four contact fingers together. Such a hunt group can be prepared by metallization much like a contact finger in the manufacturing process of the solar cell on the front side, which is much easier than applying and connecting a lead wire. Such a hunt proceeds advantageously in the type and design and manufacture much like a front contact, so with a very small cross section and at right angles to the contact fingers or in the same direction as a lead wire. Particularly advantageously, such a hunt group connecting three adjacent contact fingers to each other and is contacted by the connecting wire or the lead wire is connected to it.

In an advantageous embodiment of the invention, a lead wire is connected to a point at which the collector terminal crosses a contact finger. Here is to connect the necessary connecting surface is greatest. By the superposition of hunt and connection wire the shaded area of ​​the solar cell is also reduced.

Preferably, the lead wires may run freely or be without a fixed connection to the solar cell except for their connections with the spaced contact fingers. They may extend to, for example, in a flat sheet and possibly the largest part of their length at a distance from the surface thereof.

There are several ways to connect a lead to a contact finger or above hunt. Soldering or wire bonding is considered, both of which methods technically proven and can be large in mass production and carried out automatically be advantageous. In a further embodiment of the invention may be provided that a plurality of connecting wires form a so-called terminal group each having the same length, in particular per solar cell. This utilizes that a contact finger back as it were discrete from the terminal device length jumps are given in length to each other by the distance between two contact fingers with a length of a connecting wire. Thus, it is easy to classify the lead wires of the same length in a common terminal group. The solar cell then has a plurality of connection groups with up differently each long connecting wires. It is considered advantageous if at least three connection wires are provided for each port group. Furthermore advantageously be provided at least three such terminal groups. Solar cells commonly used for example, have 66 contact fingers. Assuming an aforementioned provision of hunt groups of as well as the fact that due to the hunt does not end at the height of each contact finger, a lead wire can be provided for example 33 or 22 terminal groups. Each port group then has two to four or even more leads.

In a further embodiment of the invention, it is possible to construct different lengths of connection wires having different cross sections. It can be provided that the cross section of the lead wires increases with increasing length of the connecting wires, whereby it advantageously remains the same for this wire. This could be taken into account the fact that he may also total, a higher current density because of its greater length. However louder identical leads advantageously be used, which facilitates benefit expense as well as cramping.

A diameter of such a lead wire can advantageously be in a range between 50 microns and 1 mm. As a particularly advantageous diameter are provided by 200 microns to about 300 microns. sufficiently high conductor cross-sections arising just above at a number of contact fingers and connection wires to a solar cell even at the same time minimized shadowing. In yet repeated a further embodiment of the invention it is considered advantageous if the connecting wires have a substantially circular cross section. Although a reduced shadowing can be achieved in principle by flat and upended cross-sections with a constant cross-section. Here, however, the effort required for the proper feeding of the lead wires may rise to a facility that connects the leads to the solar cell and the contact fingers sharply. Furthermore, the cost and manufacturing effort for wires with a round cross-section is the smallest.

A connecting wire may consist of a highly conductive material, such as aluminum, copper, silver or gold. Aluminum or copper is advantageously used. For better corrosion resistance and better solderability a lead wire may be coated with an appropriate coating. it is advantageously provided with a tin or solder, for example, 62Sn / 36 Pb / 2 Ag.

On the side of the solar cell to the connecting device through the lead wires can withstand a certain predetermined amount to be then just connected to the connecting device. Here lends itself especially the technically simpler soldering next wire bonding.

These and other features will become apparent from the claims and from the description and drawings, the individual features may be realized either alone or together in the form of sub-combinations in an embodiment of the invention and in other fields and can represent advantageous, protectable can present versions, is claimed for this protection. The subdivision of the application into individual sections and intermediate headings do not restrict the statements made in its generality.

Brief Description of Drawings

Embodiments of the invention are schematically shown in the drawings and are explained in more detail below. In the drawings:

Fig. 1 is an oblique view of a section of a solar cell according to the invention and

Fig. 2 is a plan view of an inventive solar cell having different arrangements for electrical connections.

Detailed description of embodiments

In Fig. 1, a solar cell 11 is shown in section in oblique view. The solar cell 11 is constructed of a wafer 12 substantially and to see is their upwardly facing front side 13 of the solar cell 11 extends an electrical connection device 14, for example in the form of an electrical conductor like a Stromleitschiene or the like ..

In order to collect the electrodes on the front side 13 of the solar cell 11, the contact fingers 15 are provided. These are thin metal conductor, which in known manner are applied directly to the front side 13 also by those skilled in on or are even partially sunk into the latter. The contact fingers 15 have the same distance to each other and parallel to each other.

To connect to the contact fingers 15 with the connection means 14, connecting wires 18 are provided. These connecting wires 18 all start at the connection device 14, but have different lengths so that they differ extend far to the front side 13 of the solar cell. 11 Your left-pointing ends are indeed relatively accurately on a contact finger 15 or go to such contact fingers 15. At the same time, the connection wires 18 rich not only with its leftward end to this solar cell 11 and the contact fingers 15, but at a distance of three contact fingers 15, they are always connected to the solar cell 11 and contact fingers 15 °. This course gets you a sort of waveform, which of course is far less strong in practice.

There are collective connections 16 which can be manufactured in basically the same manner as the contact fingers 15 themselves. So the hunt 16 are short electrically conductive conductor pieces and connect here three contact fingers 15. They extend approximately perpendicular to the contact fingers 15, as well as the connecting wires 18. They are electrically connected with each contact finger that they pass or cover ,

The connecting wires 18 are electrically conductively connected to connection points 19, each having a collector terminal 16 and the contact finger 15 at this point. This can be done by wire bonding or soldering. Further extend the lead wires 18, which can be seen only limited good in FIG. 1, just above the collecting terminals 16, so that the absolutely necessary degree of shadowing is minimized.

In the plan view of a solar cell 11 according to FIG. 2, the lead wires are shown straight line 18 for clarity of illustration or to the design, what they have in practice in the plan view, in spite of the slightly corrugated course in the side view of Fig. 1 can. However, the collecting terminals 16 in Fig. 2 are deviating slightly curved of practicable embodiments ones shown, provides, as they are formed in reality and in practice as possible rectilinear and perpendicular to the contact fingers 15.

The representation of the solar cell 11 in FIG. 2 is substantially also to be understood schematically. A practical solar cell has much more contact fingers 15, namely for example the aforementioned 66 pieces. Also, the solar cell 11 are also shown more than 24 contact fingers 15 are provided in the width.

The connecting wires 18 are divided into three groups 21a, 21b and 21c is divided. Within each of these groups 21 reaches a longest lead wire 18 to the second uppermost contact fingers 15 and the shortest lead wire 18 to the second lowest contact fingers 15. The length set for the individual connection wires 18 within one of these groups 21 is in each case three times the distance between two contact fingers. Thus, there are also eight groups of lead wires 18 each having the same length, wherein in each of these groups of three such connecting wires 18th

The difference in the formation of the group 21a and 21b is the distance of the collecting terminals 16 along the lead wires 18. While in the left group 21a 16 is along the longest lead wire 18, the distance of the bus connections and the length thereof, in that each contact finger 15 with this is connected to lead wire 18, it is in the middle group 21 b differently. Here, the distance of the collecting terminals 16 along a lead wire 18 is increased by once the distance between two contact fingers 15 to each other. This can of course be varied even with a plurality of connection wires of one of these groups, so that not the distance of the collecting terminals 16 and thus the resultant joints 19 between lead wire 18 and collection port 16 and contact finger 15 must be the same for each connection wire of this group. To the pure course of the contact fingers 15 separated from possible Sam- melanschlüssen 16 to better illustrate these collection ports are omitted in the right group 21c.

Furthermore, it is obvious that the length of gradation of the lead wires 18 need not be as shown in FIG. 2. The lengths may be distributed arbitrary, for example in such a way in a balanced way possible that the differences in length of two adjacent contact fingers five- having the distance between two contact fingers to eight times to each other.

As can easily be seen from consideration of the left group 21, the total available conductor cross section with contact fingers 15 that are far from the terminal device 14, quite low. Here are just one to three such long connecting wires 18 present. Close to the connection means 14 are six to eight rather short connecting wires 18. However, since the current flowing and thus be transported away power is much greater here, this by the number increased overall conductor cross-section necessary.

From the aforementioned relationship between current intensity which increases the closer the connection device is located, and the total conductor cross-section that increases in the same way, it follows that the ratio of the current remains for conductor cross section the same everywhere, independent of the distance to the connection device 14. This is one of the main advantages of the invention.

Claims

claims
1. Solar cell with front contacts on a front side of the solar cell for the collection of electrons and a connection device for connection with the front contacts, wherein are formed the front contacts in the form of thin contact fingers, characterized in that different lengths of connecting wires are guided from the contact fingers of the connecting means, wherein the lead wires, and extending at different lengths from the connection device to one or a few contact fingers, wherein at least some of the lead wires are electrically connected repeatedly in its course or over its length with contact fingers.
2. Solar cell according to claim 1, characterized in that the front contacts and / or the connecting wires extend approximately parallel to one another and / or extend at equal distance to each other.
3. Solar cell according to claim 1 or 2, characterized in that a connecting wire in each case all three to six contact finger is connected to one or a few of these contact fingers.
4. Solar cell according to claim 3, characterized in that collecting terminals are provided that connect two to four contact fingers together to form a hunt group is preferably to be substantially perpendicular to this extending contact fingers formed, in particular, a lead wire is electrically connected to the hunt group.
5. Solar cell according to claim 4, characterized in that a connecting wire is electrically connected to a cross point of the manifold with a contact finger.
6. Solar cell according to one of the preceding claims, characterized in that a lead wire by soldering or wire- bonding with a contact finger or a common terminal according to claim 4 or 5 is electrically connected.
7. Solar cell according to one of the preceding claims, characterized in that a plurality of connecting wires form each having the same length, a terminal group and the solar cell comprises a plurality of terminal groups, each with different long connecting wires, preferably three to six lead wires in a terminal group and three to six terminal groups are.
8. Solar cell according to one of the preceding claims, characterized in that different lengths of connection wires having different cross sections, wherein preferably the cross section of the lead wires increases with increasing length of the connecting wires.
9. Solar cell according to one of the preceding claims, characterized in that a diameter of a connection wire between 50 .mu.m and 1 mm, preferably from 200 microns to 300 microns is.
10. Solar cell according to one of the preceding claims, characterized in that the connecting wires have a substantially circular cross section.
11. Solar cell according to one of the preceding claims, characterized in that a connecting wire is made of a material of the following group: aluminum, copper, silver, gold.
12. Solar cell according to one of the preceding claims, characterized in that a connecting wire is coated with a coating, preferably tin is coated with solder.
13. Solar cell according to one of the preceding claims, characterized in that the connecting wires to their beabstan- Deten compounds freely extend at the contact fingers and without a fixed connection to the solar cell, preferably at a distance from the surface thereof.
14. A method for manufacturing a solar cell according to any one of the preceding claims, characterized in that different lengths of connection wires are led from the contact fingers of the connection means, the connection wires are electrically connected to both the terminal device and at least one contact finger and are connected thereto, and although some lead wires are electrically connected to a plurality of contact fingers.
PCT/EP2009/004380 2008-06-18 2009-06-17 Solar cell and method for producing a solar cell WO2009156086A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102008030262.7 2008-06-18
DE200810030262 DE102008030262A1 (en) 2008-06-18 2008-06-18 Solar cell and method of manufacturing a solar cell

Publications (2)

Publication Number Publication Date
WO2009156086A2 true WO2009156086A2 (en) 2009-12-30
WO2009156086A3 WO2009156086A3 (en) 2010-03-11

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DE (1) DE102008030262A1 (en)
TW (1) TW201003949A (en)
WO (1) WO2009156086A2 (en)

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DE102010016476A1 (en) * 2010-04-16 2011-10-20 Solarworld Innovations Gmbh A method of applying contact wires on a surface of a photovoltaic cell, photovoltaic cell, solar module arrangement for applying contact wires on a surface of a photovoltaic cell

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US20130025673A1 (en) 2010-04-01 2013-01-31 Somont Gmbh Solar cells and method for producing same
DE102010014554A1 (en) 2010-04-01 2011-10-06 Somont Gmbh Solar cell, has front contacts formed at sunny side for dissipating generated current by using contact fingers, and bus bar designed as conductor-bus bar and connected with contact fingers in mechanical and electrically-conducting manner
DE102011081674A1 (en) 2011-08-26 2013-02-28 Schmid Technology Systems Gmbh Method for electrically contacting solar cell wafers with wires for collecting current produced by solar cell, involves holding wires behind support, and cutting-off wires such that one solar cell wafer is placed on support and on wires

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DE10239845C1 (en) * 2002-08-29 2003-12-24 Day4 Energy Inc Electrode for photovoltaic cells, photovoltaic cell and photovoltaic module
DE102004013833A1 (en) * 2003-03-17 2004-10-21 Kyocera Corp. Solar cell element and the solar cell module

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010016476A1 (en) * 2010-04-16 2011-10-20 Solarworld Innovations Gmbh A method of applying contact wires on a surface of a photovoltaic cell, photovoltaic cell, solar module arrangement for applying contact wires on a surface of a photovoltaic cell
US9076922B2 (en) 2010-04-16 2015-07-07 Solarworld Innovations Gmbh Method for fitting contact wires to a surface of a photovoltaic cell, photovoltaic cell, photovoltaic module, arrangement for fitting contact wires to a surface of a photovoltaic cell

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Publication number Publication date
TW201003949A (en) 2010-01-16
WO2009156086A3 (en) 2010-03-11
DE102008030262A1 (en) 2009-12-24

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