CN103021504B - A kind of inorganic additive composition that can improve back electrode of solar cell adhesive force - Google Patents
A kind of inorganic additive composition that can improve back electrode of solar cell adhesive force Download PDFInfo
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- CN103021504B CN103021504B CN201210446516.XA CN201210446516A CN103021504B CN 103021504 B CN103021504 B CN 103021504B CN 201210446516 A CN201210446516 A CN 201210446516A CN 103021504 B CN103021504 B CN 103021504B
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Abstract
The present invention relates to a kind of inorganic additive composition that can improve back electrode of solar cell adhesive force.This inorganic additive composition that can improve back electrode of solar cell adhesive force by percetage by weight be the bismuth oxide of 20-85%, the manganese dioxide of 5-50%, the molybdenum trioxide of 10-30% form; Wherein, the percetage by weight sum of each component is 100%, and bismuth oxide, manganese dioxide and molybdenum trioxide are the filament with high length-diameter ratio or the banded structure with high-aspect-ratio.Compared with prior art, it is thread or banded that the present invention can improve each component in the inorganic additive composition of back electrode of solar cell adhesive force, easier than common powder additive with silver starch in silver powder and glass dust produce contact point, thus be more conducive to playing fluxing action to silver powder, improve the wetability of glass, and then strengthen the adhesive force of back electrode and silicon substrate, improve adhesion strength between the two.
Description
Technical field
The present invention relates to a kind of solar cell electric slurry inorganic additive, be specifically related to a kind of inorganic additive composition that can improve back electrode of solar cell adhesive force.
Background technology
Solar cell is a kind of semiconductor device that can convert solar energy into electrical energy.Back silver paste of solar cell is the chief component of solar cell electric slurry, and it is mainly used for making back side main grid in manufacture of solar cells, plays the effect of deriving of being confluxed by the electric current that aluminium back surface field is collected.Rear surface of solar cell silver slurry forms primarily of silver powder, organic bond, inorganic bond, solvent and auxiliary agent.At present, compared to former generation product, the monolithic consumption of back electrode of solar cell back of the body silver used silver slurry have dropped about 25%, and towards the future development of lower silver content, lower weight in wet base.The minimizing of silver slurry consumption must bring a series of problem, as the increase of the resistance of back electrode self and the contact resistance between back electrode and silicon substrate, the reduction etc. of adhesive force and adhesion strength between back electrode and silicon substrate, and then bring adverse influence to the life-span of battery.
In order to reduce silver slurry consumption to reduce the cost of back silver paste, keep the excellent electrical property of back electrode and reliable adhesive force between back electrode and silicon substrate simultaneously, except needing to add conventional glass dust as except inorganic bond at back silver paste, also to add the inorganic additive of some trace, because glass dust amount contained in the back silver paste of low silver content is also often lower, although improve glass dust amount can improve adhesion strength, this also can have a huge impact the resistance of silver layer simultaneously.By contrast, inorganic additive can play the effect of the bonding strength improving silver layer and silicon substrate under a little addition much smaller than glass dust consumption, therefore can not produce too much influence to the self-resistance of silver layer.Application number be 201010249934.0 and application number be 201110328226.0 Chinese patent silver slurry in use manganese dioxide as inorganic additive, this inorganic additive can reduce silver starch contact resistance, increase electrode peel strength; Application number be 200910042098.6 Chinese patent silver slurry in use bismuth oxide for inorganic additive, this inorganic additive both has the effect of fluxing to silver powder, can reduce again the softening point of glass; Application number be 201210030282.0 Chinese patent in silver slurry, use molybdenum trioxide for inorganic additive, this inorganic additive contributes to reducing the surface tension of glass, the wettability increasing glass metal and the adhesive force increased between silver powder and silicon substrate.But these traditional inorganic additives do not consider the pattern factor of its component in formula Design, are not optimized cooperation to the pattern of its component, this make inorganic additive in back silver paste the beneficial effect that rises can not give full play to.
Summary of the invention
The technical issues that need to address of the present invention are to overcome the deficiencies in the prior art, by being optimized cooperation to the pattern of inorganic additive, and then provide a kind of inorganic additive composition that can improve back electrode of solar cell adhesive force.
The technical issues that need to address of the present invention are achieved through the following technical solutions:
An inorganic additive composition for back electrode of solar cell adhesive force can be improved, its by percetage by weight be the bismuth oxide of 20-85%, the molybdenum trioxide of the manganese dioxide of 5-50% and 10-30% forms; Wherein, the percetage by weight sum of each component is 100%; Bismuth oxide is banded structure, and average length is 0.1-5 μm, and mean breadth is 50-400 nm, average thickness is 5-40 nm, and mean aspect ratio is 2-100, or is filament, average length is 0.1-5 μm, and average diameter is 5-40 nm, and average aspect ratio is 8-100; Manganese dioxide is filament, and average length is 0.1-5 μm, and average diameter is 5-40 nm, and average aspect ratio is 8-100; Molybdenum trioxide is banded structure, and average length is 0.1-5 μm, and mean breadth is 50-400 nm, average thickness is 5-40 nm, and mean aspect ratio is 2-100, or is filament, average length is 0.1-5 μm, and average diameter is 5-40 nm, and average aspect ratio is 8-100.
Above-mentioned bismuth oxide and molybdenum trioxide are obtained by the thread or banded structure of average length >5 μm is broken by mechanical shearing effect, or for directly to prepare without mechanical shearing effect, above-mentioned manganese dioxide is obtained by the filament fragmentation of mechanical shearing effect by average length >5 μm, or for directly to prepare without mechanical shearing effect.
Compared with prior art, advantage of the present invention and beneficial effect are: the composition that the present invention employs bismuth oxide, manganese dioxide and molybdenum trioxide on formula is the inorganic additive of back silver paste, and these components can play to play silver powder and flux, reduce glass softening point, improve glass wetting and strengthen the effect of adhesive force of back electrode and silicon substrate, the more important thing is, the pattern of the present invention to component each in inorganic additive composition is optimized cooperation, each component is filament or banded structure, all there is certain draw ratio or length-width ratio, thus compared with common powder additive, the inorganic additive of this pattern and silver starch in silver powder and glass dust except some point cantact can be produced, a face contact can also be produced, therefore can more contact point be formed, and then make inorganic additive rise silver powder is fluxed, reduce glass softening point, improve glass wetting effect more remarkable, thus the adhesive force of back electrode and silicon substrate is improved further, improve adhesion strength between the two, in addition, the addition of this inorganic additive composition in back silver paste only needs 0.1-3% percetage by weight, gap can be formed between thread or banded inorganic additive, the glass dust of melting and the silver powder of melting can be allowed to pass through, therefore also can not produce the formation of conductive path between inhibitory action or destruction silver powder to glass dust to the bonding effect of silver powder.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described further.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
Embodiment 1
The present invention is a kind of inorganic additive composition that can improve back electrode of solar cell adhesive force, its by percetage by weight be the bismuth oxide of 20%, the manganese dioxide of 50% and 30% molybdenum trioxide form; Wherein, bismuth oxide is banded structure, and average length is 0.1-5 μm, and mean breadth is 50-400 nm, average thickness is 5-40 nm, and mean aspect ratio is 2-100, and manganese dioxide is filament, average length is 0.1-5 μm, and average diameter is 5-40 nm, and average aspect ratio is 8-100; Molybdenum trioxide is banded structure, average length is 0.1-5 μm, mean breadth is 50-400 nm, average thickness is 5-40 nm, mean aspect ratio is 2-100, and bismuth oxide and molybdenum trioxide are all obtained by the banded structure fragmentation of mechanical shearing effect by average length >5 μm, manganese dioxide is obtained by the filament fragmentation of mechanical shearing effect by average length >5 μm.
Embodiment 2
The present invention is a kind of inorganic additive composition that can improve back electrode of solar cell adhesive force, its by percetage by weight be the bismuth oxide of 85%, the manganese dioxide of 5% and 10% molybdenum trioxide form; Wherein, bismuth oxide is filament, average length is 0.1-5 μm, average diameter is 5-40 nm, average aspect ratio is 8-100, manganese dioxide is filament, average length is 0.1-5 μm, average diameter is 5-40 nm, and average aspect ratio is 8-100, and molybdenum trioxide is for being filament, average length is 0.1-5 μm, average diameter is 5-40 nm, and average aspect ratio is 8-100, and bismuth oxide, manganese dioxide and molybdenum trioxide are and directly prepare without mechanical shearing effect.
Embodiment 3
The present invention is a kind of inorganic additive composition that can improve back electrode of solar cell adhesive force, its by percetage by weight be the bismuth oxide of 70%, the manganese dioxide of 10% and 20% molybdenum trioxide form, wherein, bismuth oxide is banded structure, average length is 0.1-5 μm, mean breadth is 50-400 nm, average thickness is 5-40 nm, mean aspect ratio is 2-100, manganese dioxide is filament, average length is 0.1-5 μm, average diameter is 5-40 nm, average aspect ratio is 8-100, molybdenum trioxide is filament, average length is 0.1-5 μm, average diameter is 5-40 nm, average aspect ratio is 8-100, and bismuth oxide is obtained by the banded structure fragmentation of mechanical shearing effect by average length >5 μm, manganese dioxide and molybdenum trioxide are obtained by the filament fragmentation of mechanical shearing effect by average length >5 μm.
Embodiment 4
The present invention is a kind of inorganic additive composition that can improve back electrode of solar cell adhesive force, its by percetage by weight be the bismuth oxide of 80%, the manganese dioxide of 8% and 12% molybdenum trioxide form, wherein, bismuth oxide is filament, average length is 0.1-5 μm, average diameter is 5-40 nm, average aspect ratio is 8-100, manganese dioxide is filament, average length is 0.1-5 μm, average diameter is 5-40 nm, average aspect ratio is 8-100, molybdenum trioxide is banded structure, average length is 0.1-5 μm, mean breadth is 50-400 nm, average thickness is 5-40 nm, mean aspect ratio is 2-100, and bismuth oxide and manganese dioxide are obtained by the filament fragmentation of mechanical shearing effect by average length >5 μm, molybdenum trioxide is obtained by the banded structure fragmentation of mechanical shearing effect by average length >5 μm.
Above-mentioned each embodiment is further illustrating of making foregoing of the present invention, but the scope that should not be construed as the above-mentioned theme of the present invention is only limitted to above-described embodiment.It should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. can improve an inorganic additive composition for back electrode of solar cell adhesive force, it is characterized in that: this inorganic additive composition by percetage by weight be the bismuth oxide of 20-85%, the molybdenum trioxide of the manganese dioxide of 5-50% and 10-30% forms; Wherein, the percetage by weight sum of each component is 100%, and bismuth oxide and molybdenum trioxide are filament or banded structure, and manganese dioxide is filament.
2. the inorganic additive composition that can improve back electrode of solar cell adhesive force according to claim 1, it is characterized in that: described banded structure bismuth oxide average length is 0.1-5 μm, mean breadth is 50-400 nm, and average thickness is 5-40 nm, and mean aspect ratio is 2-100.
3. the inorganic additive composition that can improve back electrode of solar cell adhesive force according to claim 1, is characterized in that: described filament bismuth oxide average length is 0.1-5 μm, and average diameter is 5-40 nm, and average aspect ratio is 8-100.
4. the inorganic additive composition that can improve back electrode of solar cell adhesive force according to claim 1, it is characterized in that: described manganese dioxide average length is 0.1-5 μm, average diameter is 5-40 nm, and average aspect ratio is 8-100.
5. the inorganic additive composition that can improve back electrode of solar cell adhesive force according to claim 1, it is characterized in that: described banded structure molybdenum trioxide average length is 0.1-5 μm, mean breadth is 50-400 nm, and average thickness is 5-40 nm, and mean aspect ratio is 2-100.
6. the inorganic additive composition that can improve back electrode of solar cell adhesive force according to claim 1, is characterized in that: described filament molybdenum trioxide average length is 0.1-5 μm, and average diameter is 5-40 nm, and average aspect ratio is 8-100.
7. the inorganic additive composition that can improve back electrode of solar cell adhesive force according to claim 2-6 any one, it is characterized in that: described bismuth oxide, described manganese dioxide and described molybdenum trioxide for be obtained by mechanical shearing effect fragmentation, or for directly to prepare without mechanical shearing effect.
8. the inorganic additive composition that can improve back electrode of solar cell adhesive force according to claim 7, it is characterized in that: described bismuth oxide and described molybdenum trioxide are obtained by the thread or banded structure of average length >5 μm is broken by mechanical shearing effect, and described manganese dioxide is obtained by the filament fragmentation of mechanical shearing effect by average length >5 μm.
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