CN103366854A - Composite electrode material for preparing positive electrode of photovoltaic cell - Google Patents
Composite electrode material for preparing positive electrode of photovoltaic cell Download PDFInfo
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- CN103366854A CN103366854A CN2013102835631A CN201310283563A CN103366854A CN 103366854 A CN103366854 A CN 103366854A CN 2013102835631 A CN2013102835631 A CN 2013102835631A CN 201310283563 A CN201310283563 A CN 201310283563A CN 103366854 A CN103366854 A CN 103366854A
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Abstract
The invention relates to a composite electrode material for preparing a positive electrode of a photovoltaic cell. The metallization of the front side of the photovoltaic cell is realized by silk screen printing of conductive paste, and the process seriously influences and restricts the improvement of the efficiency of the photovoltaic cell. The invention provides the composite electrode material for preparing the positive electrode of the photovoltaic cell, which is completely different from silver paste, so that the conversion efficiency of the cell is improved and the production cost can be reduced. In order to fulfill the aim, the technical scheme of the invention is that the composite electrode material for preparing the positive electrode of the photovoltaic cell consists of a conductive core positioned in the core of an electrode material and a connecting layer positioned on the surface layer of the conductive core, wherein the connecting layer is formed by drying and curing conductive cream uniformly coated on the surface of the conductive core. According to the novel composite electrode material, the contact function and the electric conduction function of the conventional electrode are separated, and the conductivity of the electrode is improved. The prepared positive electrode of the photovoltaic cell made by using the composite electrode material is less in shading and higher in electric conductivity.
Description
Technical field
The invention belongs to the photovoltaic cell field, be specifically related to a kind of combination electrode material for the preparation of photovoltaic cell front electrode.
Background technology
The photovoltaic cell front-side metallization mainly is that the mode by the silk screen printing electrocondution slurry realizes at present, and the front electrode depth-width ratio that this technique is made is little, and electrode width is large, width is inhomogeneous and collapsing of the edges is serious, and electrode height is little and highly inhomogeneous.For photovoltaic cell, electrode width is large and subside and means that seriously the front shading-area is large, and electrode height is low and inhomogeneously mean that electrode resistance is large, the internal resistance of cell is large, and these all seriously affect and restricted the lifting of power conversion efficiency (pce).
The photovoltaic cell front electrode mainly contains the effect of two aspects: on the one hand be that the electrode bottom forms at the interface with joining of battery front surface that alloy is combined and ohmic contact, play electric connection; Be the electrode body conduction current on the other hand, play the effect of conductor.Effect for electrical connection, present silver slurry can play reasonable effect, reach lower contact resistance, but the effect for conductor, because silver-colored slurry itself is to be made of silver powder, electrode prepared therefrom also is a kind of structure of porous, and its electric conductivity is more far short of what is expected than the fine and close conductor of simple metal, these have also limited the raising of electrodes conduct performance, thereby have restricted the raising of power conversion efficiency (pce).
In addition, the electrocondution slurry that is used at present the silk screen printing of photovoltaic cell front-side metallization mainly is the silver slurry, the content of silver accounts for about 90% in the silver slurry, because the noble metal characteristic of silver, present photovoltaic cell front metal formed material has also seriously restricted the further decline of photovoltaic cell manufacturing cost.
Summary of the invention
The purpose of this invention is to provide a kind of combination electrode material that is used for the preparation of photovoltaic cell front electrode that is different from the silver slurry fully, the cell piece conversion efficiency is improved, can also reduce production costs.
For realizing purpose of the present invention, the technical solution used in the present invention is:
A kind of combination electrode material for the preparation of photovoltaic cell front electrode, this combination electrode material is comprised of the conductive cores that is in the electrode material core and the articulamentum that is in the conductive cores top layer, and described articulamentum is to be solidified by the conduction lotion drying that evenly is coated in the conductive cores surface to form.
Above-mentioned conductive cores is selected from the wires such as spun gold, filamentary silver, copper wire, aluminium wire, Si-Al wire, also can be the conductive fibers such as polymer fiber or carbon fiber.
The diameter of above-mentioned conductive cores is 5 microns to 50 microns.
The thickness of above-mentioned articulamentum is 3 microns to 20 microns.
Above-mentioned conduction lotion is selected from the lotion that silver paste, copper cream, nickel cream etc. are made by metal powder.
The baking and curing temperature of above-mentioned conduction lotion is 50 ℃-200 ℃.
Above-mentioned conduction lotion comprises metal dust, metal or nonmetal oxide, organic solvent, organic bond and additive.
Component and the weight percent content of above-mentioned conduction lotion comprise:
Above-mentioned combination electrode material is when being used for making front electrode, and temperature reaches 100 ℃-500 ℃, and the articulamentum after the baking and curing has viscosity at this moment.
Above-mentioned combination electrode material is for the preparation of the photovoltaic cell front electrode.
The granular size scope of above-mentioned metal dust is 0.1-2 μ m, and form is sphere or torispherical.
Above-mentioned metal or nonmetal oxide are that in the oxides such as lead, bismuth, calcium, magnesium, zinc, platinum, tantalum, rhodium, nickel, chromium, palladium, boron, phosphorus one or more mix.
Above-mentioned organic bond is selected from ethyl cellulose, acrylic resin, NC Nitroncellulose, phenolic resins and their mixture.
Above-mentioned organic solvent is selected from terpinol, carbitol, diethylene glycol ether and their mixture.
Above-mentioned additive comprises surfactant, thixotropic agent, defoamer, dispersant, sintering inhibitor, oxidation retarder and expansion inhibitor.
This combination electrode material is made of the different two parts of function: first is the conductive cores that is in the electrode material core, mainly plays the effect of conduction current; Second portion is the articulamentum that is in the conductive cores top layer, this articulamentum will in turn play the effect of two kinds of connections in the use procedure of follow-up combination electrode: the first connection function is that combination electrode material is bonded and fixed at ad-hoc location on the cell piece front surface in the bonding processing procedure of subsequent technique, begins to take shape needed electrode pattern and structure; The second connection function be make combination electrode in the bonding processing procedure of subsequent technique, form firmly with the cell piece front surface alloying contacts, form simultaneously the electrical contact with good ohm performance.
Compare with existing conductive silver paste, a kind of combination electrode material for the preparation of photovoltaic cell front electrode of the present invention has following advantage:
1) conductive effect is good
Because silver-colored slurry itself is to be made of silver powder, electrode prepared therefrom also is a kind of structure of porous, its electric conductivity is more far short of what is expected than the fine and close conductor of simple metal, because the conductive cores of combination electrode material of the present invention is wire or conductive fiber, the electrode that the preparation of silver slurry is compared in the effect that the wire that uses or conductive fiber play conduction current, electric conductivity improves greatly.
2) the bonding tack is high
The articulamentum of combination electrode material of the present invention be the conduction lotion made by metal powder through evenly being coated in the conductive cores surface, have certain viscosity in uniform temperature, so that electrode material itself can be attached to matrix surface securely.Avoided problem in follow-up use procedure, the problem includes: stick up the line problem.
3) cost is low
Present photovoltaic cell front electrode is finished by silk-screen printing technique, the main component of electrocondution slurry is the silver slurry, the content of silver accounts for about 90% in the silver slurry, the present invention since be the conduction lotion evenly be coated in the conductive cores surface again baking and curing form, when making electrode, can reduce in a large number the use amount of silver, thereby reduce the electrode fabrication cost of solar battery sheet.
4) efficient is high
Combination electrode material of the present invention is during for the preparation of the solar battery sheet front electrode, reduced significantly the width of the thin grid line of solar battery front side, can prepare the meticulous grid line that width reaches the 20-60 micron, simultaneous altitude can reach the 15-40 micron, and the electrode depth-width ratio is large; The conductance of thin grid line can improve more than 20% than conventional silver slurry grid line, makes that electrode resistance is little, the internal resistance of cell is little, thereby has promoted the conversion efficiency of photovoltaic cell.
Description of drawings
Fig. 1 is the schematic diagram in combination electrode material of the present invention cross section.
Embodiment
Embodiment is given an example:
Embodiment one:
A kind of combination electrode material for the preparation of photovoltaic cell front electrode, formed by the conductive cores 1 that is in the electrode material core and the articulamentum 2 that is in conductive cores 1 top layer, articulamentum 2 is to be solidified by the conduction silver paste drying that evenly is coated in conductive cores 1 surface to form, and the baking and curing temperature is 50 ℃-200 ℃.Conductive cores is the copper wire of 10-20 micron, and by the percentage by weight of conduction silver paste, metal or nonmetal oxide account for 5% in the conduction silver paste, and organic bond accounts for 5%, and organic solvent accounts for 5%, and additive accounts for 1%, and all the other are silver powder.The granular size scope of silver powder is 0.1-2 μ m, and form is sphere or torispherical.The thickness of articulamentum is the 5-10 micron.Metal or nonmetal oxide are that in the oxides such as lead, bismuth, calcium, magnesium, zinc, platinum, tantalum, rhodium, nickel, chromium, palladium, boron, phosphorus one or more mix.Organic bond is ethyl cellulose.Organic solvent is diethylene glycol ether.Additive comprises surfactant, thixotropic agent, defoamer, dispersant, sintering inhibitor, oxidation retarder, expansion inhibitor.Described combination electrode material is when being used for making front electrode, and temperature reaches 100 ℃-500 ℃, and the articulamentum after the baking and curing has viscosity at this moment.
Embodiment two:
A kind of combination electrode material for the preparation of photovoltaic cell front electrode, formed by the conductive cores 1 that is in the electrode material core and the articulamentum 2 that is in conductive cores 1 top layer, articulamentum 2 is to be solidified by the conduction silver paste drying that evenly is coated in conductive cores 1 surface to form, and the baking and curing temperature is 50 ℃-200 ℃.Conductive cores is the filamentary silver of 10-20 micron, and by the percentage by weight of conduction silver paste, metal or nonmetal oxide account for 8% in the conduction silver paste, and organic bond accounts for 5%, and organic solvent accounts for 5%, and additive accounts for 2%, and all the other are silver powder.The granular size scope of silver powder is 0.1-2 μ m, and form is sphere or torispherical.The thickness of articulamentum is the 5-10 micron.Metal or nonmetal oxide are that in the oxides such as lead, bismuth, calcium, magnesium, zinc, platinum, tantalum, rhodium, nickel, chromium, palladium, boron, phosphorus one or more mix.Organic bond is ethyl cellulose.Organic solvent is diethylene glycol ether.Additive comprises surfactant, thixotropic agent, defoamer, dispersant, sintering inhibitor, oxidation retarder, expansion inhibitor.Described combination electrode material is when being used for making front electrode, and temperature reaches 100 ℃-500 ℃, and the articulamentum after the baking and curing has viscosity at this moment.
Embodiment three:
A kind of combination electrode material for the preparation of photovoltaic cell front electrode, formed by the conductive cores 1 that is in the electrode material core and the articulamentum 2 that is in conductive cores 1 top layer, articulamentum 2 is to be solidified by the conduction silver paste drying that evenly is coated in conductive cores 1 surface to form, and the baking and curing temperature is 50 ℃-200 ℃.Conductive cores 1 is the aluminium wire of 10-20 micron, and by the percentage by weight of conduction silver paste, metal or nonmetal oxide account for 10% in the conduction silver paste, and organic bond accounts for 1%, and organic solvent accounts for 1%, and additive accounts for 1%, and all the other are silver powder.The granular size scope of silver powder is 0.1-2 μ m, and form is sphere or torispherical.The thickness of articulamentum is the 5-10 micron.Metal or nonmetal oxide are that in the oxides such as lead, bismuth, calcium, magnesium, zinc, platinum, tantalum, rhodium, nickel, chromium, palladium, boron, phosphorus one or more mix.Organic bond is ethyl cellulose.Organic solvent is diethylene glycol ether.Additive comprises surfactant, thixotropic agent, defoamer, dispersant, sintering inhibitor, oxidation retarder, expansion inhibitor.Described combination electrode material is when being used for making front electrode, and temperature reaches 100 ℃-500 ℃, and the articulamentum after the baking and curing has viscosity at this moment.
Embodiment four:
A kind of combination electrode material for the preparation of photovoltaic cell front electrode, formed by the conductive cores 1 that is in the electrode material core and the articulamentum 2 that is in conductive cores 1 top layer, articulamentum 2 is to be solidified by the conduction lotion drying that evenly is coated in conductive cores 1 surface to form, the conduction lotion is conduction nickeline compound, and the baking and curing temperature is 50 ℃-200 ℃.Conductive cores 1 is the copper wire of 10-20 micron, press the percentage by weight of conduction lotion in the conduction silver paste, metal or nonmetal oxide account for 8%, organic bond accounts for 3%, organic solvent accounts for 3%, additive accounts for 3%, and all the other are the mixture of silver powder and nickel by powder, and the weight ratio of silver powder and nickel by powder is 7: 1.The granular size scope of silver powder and nickel by powder is 0.1-2 μ m, and form is sphere or torispherical.The thickness of articulamentum is the 5-10 micron.Metal or nonmetal oxide are that in the oxides such as lead, bismuth, calcium, magnesium, zinc, platinum, tantalum, rhodium, nickel, chromium, palladium, boron, phosphorus one or more mix.Organic bond is ethyl cellulose.Organic solvent is carbitol.Additive comprises surfactant, thixotropic agent, defoamer, dispersant, sintering inhibitor, oxidation retarder, expansion inhibitor.Described combination electrode material is when being used for making front electrode, and temperature reaches 100 ℃-500 ℃, and the articulamentum after the baking and curing has viscosity at this moment.
It is cited that content of the present invention is not limited to embodiment, and the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading specification of the present invention is claim of the present invention and contains.
Take embodiment 1 as example, combination electrode material of the present invention in the preparation, at first pass through the conductive wire of metal drawing process drawing certain diameter, again purified treatment is carried out on the conductive filament surface, the lotion that will conduct electricity is positioned in the lotion groove, be provided with roller bearing in the lotion groove, rotate roller bearing, make roller bearing coat one deck conduction lotion, make again conductive filament through roller surface, thereby make the conductive filament surface also apply the last layer lotion, make again conductive filament through baking oven, organic solvent volatilization in the lotion is solidified, be attached together firmly with conductive filament, thereby finish the preparation of this electrode material.
This combination electrode material is easy to use: its front electrode pattern according to design is laid equally spacedly and bondd and is attached on the cell piece front, by infrared or ultrasonic mode it being carried out bonding again processes, the adhesive linkage that makes combination electrode material and cell piece front form firmly that alloy is combined and good electricity is communicated with, and can finish the making of positive thin electrode.When laying and bonding are attached to the cell piece front, can also avoid exerting pressure of silk screen printing existence, cause the problem of die crack.
The lotion that the present invention uses is because its special prescription is a kind of conductive paste with special fluid property, and this lotion has good coating effect, can stablize, be coated on equably the conductive cores surface.Different compositions can impel this lotion can evenly be coated in easily the conductive cores top layer on the one hand adjustablely in the conduction lotion, in follow-up technique use procedure, can promote it to the adhesion strength of substrate and conductive filament on the other hand, also can optimize the electricity contact performance between itself and substrate.And articulamentum has again certain viscosity at a certain temperature after baking and curing, so that electrode itself can be attached to device surface securely.
This combination electrode material is than the silver paste of silk screen printing, the battery front side electrode of producing, pattern, plasticity are better on the one hand, shading still less, conductance is also higher on the other hand.In addition, because this combination electrode material is more conducive to further carry out improvement in performance and lifting from electric conductivity and bonding contact performance two aspects respectively to the segmentation of itself function.
Claims (15)
1. one kind is used for the combination electrode material that the photovoltaic cell front electrode prepares, it is characterized in that: described combination electrode material is comprised of the conductive cores that is in the electrode material core (1) and the articulamentum (2) that is in the conductive cores top layer, and described articulamentum (2) is to be solidified by the conduction lotion drying that evenly is coated in conductive cores (1) surface to form.
2. a kind of combination electrode material for photovoltaic cell front electrode preparation according to claim 1, it is characterized in that: described conductive cores (1) is selected from the wires such as spun gold, filamentary silver, copper wire, aluminium wire, Si-Al wire, also can be the conductive fibers such as polymer fiber or carbon fiber.
3. a kind of combination electrode material for photovoltaic cell front electrode preparation according to claim 1 and 2, it is characterized in that: the diameter of described conductive cores (1) is 5 microns to 50 microns.
4. a kind of combination electrode material for photovoltaic cell front electrode preparation according to claim 1, it is characterized in that: the thickness of described articulamentum (2) is 3 microns to 20 microns.
5. a kind of combination electrode material for photovoltaic cell front electrode preparation according to claim 1, it is characterized in that: described conduction lotion is selected from the lotion that silver paste, copper cream, nickel cream etc. are made by metal powder.
6. a kind of combination electrode material for photovoltaic cell front electrode preparation according to claim 1 or 5, it is characterized in that: the baking and curing temperature of described conduction lotion is 50 ℃-200 ℃.
7. a kind of combination electrode material for photovoltaic cell front electrode preparation according to claim 1, it is characterized in that: described conduction lotion comprises metal dust, metal or nonmetal oxide, organic solvent, organic bond and additive.
8. a kind of combination electrode material for photovoltaic cell front electrode preparation according to claim 1, it is characterized in that: component and the weight percent content of described conduction lotion comprise:
9. a kind of combination electrode material for photovoltaic cell front electrode preparation according to claim 1, it is characterized in that: described combination electrode material is when being used for making front electrode, temperature reaches 100 ℃-500 ℃, and the articulamentum after the baking and curing has viscosity at this moment.
10. a kind of combination electrode material for photovoltaic cell front electrode preparation according to claim 1, it is characterized in that: described combination electrode material is for the preparation of the photovoltaic cell front electrode.
11. according to claim 7 or 8 described a kind of combination electrode materials for photovoltaic cell front electrode preparation, it is characterized in that: the granular size scope of described metal dust is 0.1-2 μ m, and form is sphere or torispherical.
12. according to claim 7 or 8 described a kind of combination electrode materials for photovoltaic cell front electrode preparation, it is characterized in that: described metal or nonmetal oxide mix in the oxides such as lead, bismuth, calcium, magnesium, zinc, platinum, tantalum, rhodium, nickel, chromium, palladium, boron, phosphorus one or more.
13. according to claim 7 or 8 described a kind of combination electrode materials for photovoltaic cell front electrode preparation, it is characterized in that: described organic bond is selected from ethyl cellulose, acrylic resin, NC Nitroncellulose, phenolic resins and their mixture.
14. according to claim 7 or 8 described a kind of combination electrode materials for photovoltaic cell front electrode preparation, it is characterized in that: described organic solvent is selected from terpinol, carbitol, diethylene glycol ether and their mixture.
15. according to claim 7 or 8 described a kind of combination electrode materials for photovoltaic cell front electrode preparation, it is characterized in that: described additive comprises surfactant, thixotropic agent, defoamer, dispersant, sintering inhibitor, oxidation retarder and expansion inhibitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102835631A CN103366854A (en) | 2013-07-08 | 2013-07-08 | Composite electrode material for preparing positive electrode of photovoltaic cell |
| PCT/CN2013/001010 WO2015003292A1 (en) | 2013-07-08 | 2013-08-26 | Composite electrode material and process for preparing front electrode of photovoltaic cell |
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| CN2013102835631A CN103366854A (en) | 2013-07-08 | 2013-07-08 | Composite electrode material for preparing positive electrode of photovoltaic cell |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104752533A (en) * | 2014-12-31 | 2015-07-01 | 苏州润阳光伏科技有限公司 | Gate line structure of solar cell |
| CN107316669A (en) * | 2016-04-27 | 2017-11-03 | 上海纳晶科技有限公司 | Nano Silver wraps up one-dimensional linear electrode material and preparation method thereof |
| CN113611778A (en) * | 2021-08-18 | 2021-11-05 | 苏州诺菲纳米科技有限公司 | Method for replacing traditional photovoltaic low-temperature silver paste with metal compound and application of metal compound |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104752533A (en) * | 2014-12-31 | 2015-07-01 | 苏州润阳光伏科技有限公司 | Gate line structure of solar cell |
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| CN107316669B (en) * | 2016-04-27 | 2019-06-11 | 上海纳晶科技有限公司 | Nano silver wraps up one-dimensional linear electrode material and preparation method thereof |
| CN113611778A (en) * | 2021-08-18 | 2021-11-05 | 苏州诺菲纳米科技有限公司 | Method for replacing traditional photovoltaic low-temperature silver paste with metal compound and application of metal compound |
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Application publication date: 20131023 |