EP1261990A1 - Flexible metal substrate for cis solar cells, and method for producing the same - Google Patents

Flexible metal substrate for cis solar cells, and method for producing the same

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Publication number
EP1261990A1
EP1261990A1 EP01911618A EP01911618A EP1261990A1 EP 1261990 A1 EP1261990 A1 EP 1261990A1 EP 01911618 A EP01911618 A EP 01911618A EP 01911618 A EP01911618 A EP 01911618A EP 1261990 A1 EP1261990 A1 EP 1261990A1
Authority
EP
European Patent Office
Prior art keywords
nickel
characterized
copper foil
layer
molybdenum
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Withdrawn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
EP01911618A
Other languages
German (de)
French (fr)
Inventor
Thomas Hoffmann
Klaus Jacobs
Klaus Kalberlah
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.)
CIS Solartechnik GmbH and Co KG
Original Assignee
CIS Solartechnik GmbH and Co KG
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 DE10005680 priority Critical
Priority to DE2000105680 priority patent/DE10005680B4/en
Priority to DE2000106823 priority patent/DE10006823C2/en
Priority to DE10006823 priority
Application filed by CIS Solartechnik GmbH and Co KG filed Critical CIS Solartechnik GmbH and Co KG
Priority to PCT/EP2001/001313 priority patent/WO2001057932A1/en
Publication of EP1261990A1 publication Critical patent/EP1261990A1/en
Application status is Withdrawn legal-status Critical

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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
    • H01L31/0248Semiconductor 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 characterised by their semiconductor bodies
    • H01L31/036Semiconductor 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 characterised by their semiconductor bodies characterised by their crystalline structure or particular orientation of the crystalline planes
    • H01L31/0392Semiconductor 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 characterised by their semiconductor bodies characterised by their crystalline structure or particular orientation of the crystalline planes including thin films deposited on metallic or insulating substrates ; characterised by specific substrate materials or substrate features or by the presence of intermediate layers, e.g. barrier layers, on the substrate
    • H01L31/03926Semiconductor 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 characterised by their semiconductor bodies characterised by their crystalline structure or particular orientation of the crystalline planes including thin films deposited on metallic or insulating substrates ; characterised by specific substrate materials or substrate features or by the presence of intermediate layers, e.g. barrier layers, on the substrate comprising a flexible substrate
    • H01L31/03928Semiconductor 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 characterised by their semiconductor bodies characterised by their crystalline structure or particular orientation of the crystalline planes including thin films deposited on metallic or insulating substrates ; characterised by specific substrate materials or substrate features or by the presence of intermediate layers, e.g. barrier layers, on the substrate comprising a flexible substrate including AIBIIICVI compound, e.g. CIS, CIGS deposited on metal or polymer foils
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00Electroforming
    • C25D1/04Wires; Strips; Foils
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10Electroplating with more than one layer of the same or of different metals
    • 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
    • H01L31/0248Semiconductor 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 characterised by their semiconductor bodies
    • H01L31/0256Semiconductor 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 characterised by their semiconductor bodies characterised by the material
    • H01L31/0264Inorganic materials
    • H01L31/032Inorganic materials including, apart from doping materials or other impurities, only compounds not provided for in groups H01L31/0272 - H01L31/0312
    • H01L31/0322Inorganic materials including, apart from doping materials or other impurities, only compounds not provided for in groups H01L31/0272 - H01L31/0312 comprising only AIBIIICVI chalcopyrite compounds, e.g. Cu In Se2, Cu Ga Se2, Cu In Ga Se2
    • 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
    • H01L31/0248Semiconductor 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 characterised by their semiconductor bodies
    • H01L31/036Semiconductor 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 characterised by their semiconductor bodies characterised by their crystalline structure or particular orientation of the crystalline planes
    • H01L31/0392Semiconductor 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 characterised by their semiconductor bodies characterised by their crystalline structure or particular orientation of the crystalline planes including thin films deposited on metallic or insulating substrates ; characterised by specific substrate materials or substrate features or by the presence of intermediate layers, e.g. barrier layers, on the substrate
    • 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
    • Y02E10/54Material technologies
    • Y02E10/541CuInSe2 material 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/52Manufacturing of products or systems for producing renewable energy
    • Y02P70/521Photovoltaic generators

Abstract

Substrates known in the art for use in flexible CIS solar cells have a series of drawbacks. The aim of the invention is to overcome these drawbacks. To this end, the substrate is characterized by a layer structure that comprises a chromium, nickel or nickel-iron base layer and a molybdenum, tungsten or palladium contact layer, or a nickel-molybdenum, nickel-tungsten or nickel-palladium alloy contact layer, or only a nickel-molybdenum, nickel-tungsten or nickel-palladium alloy contact layer disposed on a strip-shaped copper film. The layer structure is produced by a galvanic method. Advantageously, a galvanically deposited copper strip is used as the substrate material for the CIS solar cells.

Description

Flexible metallic substrate for CIS - solar cells and

Process for its preparation

description

The invention betrif ft a flexible metallic substrate for CIS solar cells and methods for production thereof.

In an effort to generate electricity from sunlight without polluting the environment with costs that are in the same order as the production costs of fossil fuels, great efforts to develop cost-effective solar cells are made. In this case, thin film solar modules represent the most recent development. Here, layers of high-purity silicon, cadmium telluride or copper-indium-selenide / sulfur (abbreviated as CIS) of less than 1 micron thickness, usually by means of vacuum techniques, vapor deposited on glass.

Among the three above-mentioned thin-film technologies, the CIS technology is particularly interesting because of its environmental impact and the absence of degradation (decreasing effectiveness by Al tern). The CIS layer is usually deposited on glass which was mostly covered until the sputtering with molybdenum.

However, various efforts have been made to also use flexible materials because of the disadvantages of glass as a substrate. In the consideration that the use of copper would allow as a carrier material, the electrochemical deposition of the CIS layer and copper itself is a component of the CIS layer 34 has been proposed in DE-A 196 580, to use a copper sheet as base material. First, indium is plated onto the copper tape. In a second step, the strip is heated and applied to the heated layer of indium in the vapor phase vorliegendes selenium or sulfur, copper diffused into the indium layer, and there is intended to form together with the selenium / sulfur, the CIS layer. The process requires precise maintenance of the temperature range and the process times for selenization or Sulfudisierung. In addition, formed on the surface of copper or copper selenide sulfide, which would interfere with the purity of the CIS layer and therefore must be removed again ätztech- cally. Finally, it can not be ruled out that in the course of time further diffused copper into the CIS layer and changes the time required for the photo-voltaic effect composition, and thus increasingly diminished the function of the solar cell. Due to the use of copper pad for the simultaneous construction of the CIS layer no diffusion barrier exists here.

The use of rolled copper strip is problematic insofar, as that accommodates this through the smelting process a number of impurities. While it is subjected to electrolytic refining, but the achievable purity of 99.99% must be "contaminated strong" in the sense of solar semiconductor technology as apply. While there are oxygen free grades available, but they still contain a non-determinable number of others, within the meaning of possible arise semiconductor technology non-minor additions. in addition, the copper tape must be intermediately during the rolling process after each rolling pass. Here SHORT- more impurities of the copper surface. thin-rolled copper strip is thus again relatively expensive, and contains second impurities that upon application of a CIS layer prove disruptive.

A fundamental disadvantage of copper is furthermore that the thermal expansion coefficient of the crystalline CIS layer is so different from that of the copper band, that in the heat treatment that is required after application of the CIS layer, easy to form cracks in the CIS layer is, thus, each photovoltaic function is nullified.

It has also been suggested that CIS layer, as used for example for bushings of electrical terminals in halogen lamps to be applied to a commercially available flexible molybdenum foil. However, molybdenum foil has about four times the price of copper tape. Its use is probably also come because of the impurities contained therein, not laboratory tests.

has also become known plastic films for CIS deposition. However, the selection of sufficiently high temperature resistant materials causes considerable trouble. Moreover, such films must naturally only by ITO / TCO layers e lectric be made conductive, which in turn is usually done by vacuum evaporation, which makes the cost increase significantly.

Chromium-nickel steel foil that has already been proposed to also suitable bit, as it tends to absorb hydrogen, which forms on the film surface bubbles which result in the deposition of the CIS layer to "pin HO- les" , resulting in the subsequent application of a transparent cover layer to short circuits, which make the solar cell useless.

The invention has the object of providing a metallic substrate for a flexible belt-shaped solar cell and procedural for its preparation indicate that allow the galvanic deposition of the CIS layer and thus do not require vacuum technology, with which the diffusion of ions of the substrate in the CIS-layer is prevented. The substrate should be insensitive to mechanical (bending of the cell), and thermal influences on the solar cell.

The object is solved by the features of claims 1 to 3, 6 and 8. Advantageous embodiments of the invention are subject of the subclaims.

Thereafter, a band-shaped copper foil is used as carrier material. The substrate is formed from the carrier material consists of a base layer of chrome, nickel or nickel-iron and a contact layer made of molybdenum, tungsten or palladium or a nickel-molybdenum, nickel-tungsten or nickel-palladium alloy, or only by applying a layer structure a contact layer of a nickel-molybdenum, nickel-tungsten or nickel-palladium alloy. The layer sequence may be generated in the order indicated by electrodeposition.

The layer of molybdenum, tungsten or palladium or a nickel-molybdenum, nickel-tungsten or nickel-palladium alloy takes on the "switching" between the very different thermal expansion coefficients of copper / nickel and CIS, while nickel or nickel iron, the strength of the layered composite increased significantly and represents a diffusion barrier to copper ions. molybdenum has lastizitätsmodul a very small, the CIS layer similar thermal expansion coefficient, on the other hand a high E-, which is able to absorb the tensions between the lower and daruberliegenden layers of different expansion. a layer of tungsten behaves similarly, that it shows low thermal expansion high elasticity.

As a composite system thus provides the layer structure of an overall One suitable substrate is producible solely in bandgalvanoche- mix method, despite the intrinsically high cost of molybdenum, tungsten and palladium or nickel-molybdenum, nickel-tungsten or nickel -palladium alloy is overall price-value because of the small layer thicknesses.

Advantageous has proven to be subjected to the copper foil after the coating with the base layer and / or contact layer to a heat treatment before the CIS-layer is applied.

Copper foil has the advantage that it is flexible and cheaper than other metal foils. The good conductivity also is not too great significance since photovoltaically generated current has a low current density. It is therefore also copper alloys, which have a lower conductivity, but other benefits have to be used.

Copper, however, has in itself for use as a support material which already indicated above serious disadvantages, which are overcome by the invention. First, the high temperature strength of pure copper is very low, so that can cause mechanical stresses during the subsequent tempering process to damage the thin CIS layer without any further action. Second are copper ions, as already stated, extremely mobile, so that they would migrate in the annealing process, but also even at the operating temperature of the solar cells in an uncontrolled amount into the CIS layer. Third, the thermal expansion coefficient of copper is of the crystalline CIS layer different in such a way that can be expected under the influence of temperature with a cracking in the thin, resting CIS absorber layer, which in turn each photovoltaic function negates.

With the inventive layer structure, first, a chromium, nickel or nickel-iron, as already described, is applied base layer serving as a diffusion barrier, as an adaptation with respect to the expansion coefficient and as an adhesion layer for the subsequent layers. The nickel-iron layer is known as so-called KOVAR or INVAR alloy. Chromium, nickel or nickel-iron can be deposited by electroplating. The following contact layer is made of molybdenum, tungsten or palladium or a nickel-molybdenum, nickel-tungsten or nickel-palladium alloy, which can be applied also by electroplating.

Another variant is the sole deposition of a nickel-palladium, nickel-molybdenum or nickel-tungsten alloy on the copper foil onsbarriere simultaneously as a diffusion and serves as a switching layer for the CIS layer. The galvanic deposition of a molybdenum layer, little is known, is as an alloy deposition with nickel, as nickel palladium or nickel-tungsten but possible.

Layers of palladium, nickel-palladium or tungsten or tungsten palladium in themselves already a diffusion barrier against copper is, however, the expensive precious metals can be used in lesser film thickness and are cally applied with better adhesion and without the contamination of baths by copper galvanic, when at least one thin layer of nickel is deposited on the copper foil before.

Molybdenum is not able to act as a diffusion barrier for copper and therefore requires a nickel layer with a certain minimum thickness as a backing. On the other hand, the direct contact of a pure nickel layer with the CIS layer must be avoided because this would form complexes CIS nickel, so pure CIS would no longer be for the crystalline structure available.

The copper foil should have a very low surface roughness, however, can be micrograph oberflächenvergrößert by bulges already be introduced during the manufacturing process to maximize the light later. This will diffuse in the solar cell up aptly radiation, light absorption, thereby increasing the overall samt1eistung.

To the support material with the substrate layers, the CIS layer can be applied by electroplating in a known manner, then, so that no vacuum equipment is needed. The CIS layer is subsequently activated in a Wärmebhandlungsprozeß. Copper foil produced is advantageously used as the carrier material by electrolytic deposition.

Surprisingly, it has been shown that electrodeposited copper foil which has been traditionally used exclusively for PCB production, has a series of previously unused or in other applications where not sought benefits that prove this to be relevant. Electrodeposited copper foil that is manufactured for PCB production with certain roughness. Also rolled copper strip has a certain roughness. Such roughness is for further processing, namely for bonding, an advantage would however be detrimental to solar cells. Electrodeposited copper foil can be against it even with very low roughness produced what is for solar cells is of great advantage.

The copper foil is made as an endless belt by deposition from an electrolytic bath. It can be added to the bath loading constituents to increase their deposits in the copper foil, the tensile strength and / or temperature resistance and / or reduce the coefficient of expansion of the copper foil, for example nickel. Additionally or alternatively, the copper foil can be provided at the first exhaust process differs by further electroplating treatment with further metallic layers subsequently.

Also a simultaneous deposition of substances to diffuse selectively in small quantities in the CIS layer is possible. For example, sodium migrates at a later heat treatment, which is necessary for activation of the CIS layer in a controlled amount into the CIS layer and a favored there in the manner of a flux crystallization. Suitable bath additives for simultaneous deposition are, for. For example those which u depositing nickel, zinc, tin. cause like.. In particular nickel causes an increase in the tensile strength of the copper foil that would otherwise be lost in the following heat treatment processes. Copper foil with a certain nickel content then has the effect that the following basic layer can be made much thinner and adhere better.

can fertil a subsequent layer structure by galvanic deposition, for example, the result of copper foil / nickel or copper foil / (nickel iron) to be.

The use of electrodeposited copper foil for building flexible CIS solar cells has several advantages. In addition to the aforementioned possibility of targeted alloy formation, the film can also be produced in high purity, but which played for the previous application in PCB manufacture no role and was not used there. The price of electroplated thin copper foil is not higher than the rolled for comparable copper tape.

The copper foil is in contrast to copper foil, which is for the printed circuit board industry to use, manufactured with a small surface roughness, can be both oberflächenvergrößert to maximize the subsequent light reception by bulges already be introduced during deposition, without the manufacturing technology, a special overhead incurred. The dimension of this Auswöl- exercises is macroscopically. Such such. B. hemispherical bulges on the order of about 2 mm can be realized by appropriate design of the separator drum. In this way, the absorption of light and thus the cell is increased efficiency at diffusely incident on the solar cell radiation. In addition, the bulges decrease a linear expansion of the copper under the influence of temperature and thus represent a desirable adaptation to the behavior of the CIS layer (avoidance of cracking).

Finally, other requirements regarding the shape can be realized without significant additional expense for electrodeposition, such as boundaries of the actual cell areas on the copper foil or cams similarly advantageous to the contact surfaces of a relay in the subsequent interconnection of the solar cell to solar cell modules for contacting current carrying are (so-called "shingles").

On the carrier material, the CIS layer can also be applied by electroplating in a known manner then, so that a total of a galvanic process is present and no vacuum equipment is needed within a band process of solar cell production.

The invention will be explained below with reference to two exemplary embodiments in more detail. In the drawings

Fig. 1 is an example of a layer structure of molybdenum on a flexible carrier material,

Fig. 2 shows a second example of a layer structure with palladium / tungsten,

Fig. 3 shows a third example of a layer structure with a nickel-palladium alloy, Fig. 4 schematically shows a plant for depositing a copper foil of an electrolytic bath and

Fig. 5, the thus-deposited copper foil in cross-section. Referring to FIG. 1, the flexible substrate of an electrodeposited copper foil 1 on the first galvanochemisch a nickel layer 3, and then a nickel was molybdenum layer 4 is applied. Since molybdenum is not a very good diffusion barrier for copper ions, must in this case, a relatively thick layer of nickel, approximately in a thickness of 2 microns, can be applied. Nickel then takes over the function of a diffusion barrier and increases the high temperature strength of the copper foil 1. In the nickel-molybdenum layer 4 can finally if galvanically a CIS layer 5 are applied in a conventional manner likewise.

According to the example shown in FIG. 2, an electrodeposited copper foil 1 is in turn used to electrically also a nickel layer 2 was first deposited, in this case, however, only having a thickness of about 0.2 microns. is the allowed by the further layer structure after a layer 6 of nickel-palladium or nickel-tungsten follows. Palladium and tungsten, provide better diffusion barrier is as molybdenum, so that the nickel layer is 2 al- lein needed here for adhesion promotion. Finally, again, the CIS-layer is followed in known manner.

In Fig. 3, a third variant is shown. 7 mid-thickness alloy layer applied as it stands as a standard product in the strip electroplating available - in this case was applied to a copper foil 1 alone, a nickel (20) -palladium (80). CIS-layer is then applied to these.

An electrolyte system for the production of copper foil con- sists of FIG. 4 from a drum 8, which is rotatably supported in a tank 9, in which an electrolyte 10 is located. The drum 8 forms the cathode, the basin 9 the anode. The basin 9 is provided with an inlet 11 for the electrolyte 10, while a flow in which the basin 9 enclosing container 15 is provided 12th Copper is deposited on the drum 8 by rotating the drum 8 when voltage is applied, which can be lifted as a copper foil 13 of about 35 mm width and at a thickness of about 0.2 mm from the drum 8 and is wound onto a reel 14 ,

The electrolyte may be added in such a concentration a suitable nickel salt, that the copper foil 13 forms a desired kind of an alloy composition. By the nickel content, in the subsequent heat treatment, the otherwise strongly reduced tensile strength of the copper foil 13 is increased.

Fig. 5 shows a cross section through a thus prepared copper foil 13 and a later applied CIS layer 20. Due to the structuring of the drum 8, the copper foil on 13 semi-spherical bulges 19, which increase the light absorption in a finished solar module. On the convex side 16 as smooth as possible held these bulges the photovoltaically active layer 20 CIS is applied later. The other concave side 21 may have degegen a certain roughness. The convex side 16 has only a low degree of roughness due to the polished surface of the drum. 8

For interconnection of solar cells to form a solar module, a special edge design, z. B. for dividing the substrate into individual solar cells can be provided which can be introduced in the manufacturing process with the same. a bent edge strip serves to support a next solar cell in the embodiment illustrated here, 18, while, are intended to improve the contact hollowed contact points 17 on the other edge side, which is contacted with an edge strip 18 of a next solar cell. At the same time the edge strip used to restrict the actual coated with the CIS layer 20 cell area. It can, except for the contact points 17, be coated with an insulating material.

LIST OF REFERENCE NUMBERS

1. Copper foil

2. nickel layer 3. nickel layer

4. nickel-molybdenum layer

5. CIS layer

6. layer of nickel-palladium or nickel-tungsten

7. Nickel (20) palladium (80) alloy layer 8 drum

9. basin

10. electrolyte

11. inlet (for electrolyte)

12. drain 13 (for electrolyte) copper foil

14. reel

15 containers

16. Convex side (the copper foil)

17. Contact points 18. edge strips

19. bulges

20. CIS layer

21 Concave side (the copper foil)

Claims

claims
1. Flexible metallic substrate for CIS solar cells, characterized in that it consists of a layer structure of a base layer of chrome, nickel or nickel-iron and a contact layer made of molybdenum, tungsten or palladium or a nickel-molybdenum, nickel-tungsten or nickel-palladium alloy, or of only a contact layer made of a nickel-molybdenum, nickel-tungsten or nickel-palladium alloy is on a band-shaped copper foil, wherein the layer structure is produced galvanically.
2. A process for producing a flexible metallic substrate for a CIS solar cell, characterized in that on a band-shaped copper foil electrodeposited at first a chromium, nickel or nickel-iron base layer and then a contact layer made of molybdenum, tungsten or palladium or a nickel molybdenum, nickel, tungsten, or nickel-palladium alloy is applied.
3. A process for producing a flexible metallic substrate for a CIS solar cell, characterized in that a contact layer of electrodeposited nickel-molybdenum, nickel-tungsten or nickel palladium alloy is applied to a band-shaped copper foil.
4. The method of claim 2 or 3, characterized in that the copper foil is subjected to coating with the base layer and / or contact layer of a heat treatment.
5. The method according to claim 2, characterized in that the nickel layer made of a nickel electrolyte with nickel - bromides is deposited.
6. band-shaped copper foil characterized as a substrate for a CIS solar cell characterized in that it is produced by electrolytic deposition.
7. A copper foil according to claim 6, characterized in that its surface is enlarged by bulges (19)
8. A process for producing band-shaped copper foil as a carrier material for a CIS solar cell, characterized in that the copper foil is made as an endless belt by deposition from an electrolytic bath, and that the bath alloying components are added which increase the tensile strength and / or temperature resistance in the copper foil and / or reduce the coefficient of expansion.
, A method according to claim 8, characterized in that is used as an alloy constituent of nickel.
10. The method according to claim 8, characterized in that zinc is used as an alloy component.
11. The method according to claim 8, characterized in that iron is used as an alloy component.
12. The method according to claim 8, characterized in that the bath substances are added which will later diffuse into the CIS layer.
13. The method according to claim 12, characterized in that a sodium compound is used as the added substance.
14. The method of claim 8 to 13, characterized in that the copper foil is provided vaults during deposition of a surface-structured drum with surface training.
15. The method of claim 8 to 14, characterized in that the copper foil is provided with structures during the deposition on a surface-structured drum, which limit the solar cell or divide.
16. The method according to claim 8 to 15, characterized in that the copper foil is provided with contact cams in depositing on a surface-structured drum.
EP01911618A 2000-02-07 2001-02-07 Flexible metal substrate for cis solar cells, and method for producing the same Withdrawn EP1261990A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE10005680 2000-02-07
DE2000105680 DE10005680B4 (en) 2000-02-07 2000-02-07 Support material for a flexible, band-shaped CIS solar cell
DE2000106823 DE10006823C2 (en) 2000-02-08 2000-02-08 A process for producing a flexible metallic substrate for a CIS solar cell, and CIS solar cell
DE10006823 2000-02-08
PCT/EP2001/001313 WO2001057932A1 (en) 2000-02-07 2001-02-07 Flexible metal substrate for cis solar cells, and method for producing the same

Publications (1)

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EP1261990A1 true EP1261990A1 (en) 2002-12-04

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Application Number Title Priority Date Filing Date
EP01911618A Withdrawn EP1261990A1 (en) 2000-02-07 2001-02-07 Flexible metal substrate for cis solar cells, and method for producing the same

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