CN104157330A - Aluminium powder for aluminium slurry of crystalline silicon solar battery, preparation method thereof, and solar battery containing aluminium powder - Google Patents
Aluminium powder for aluminium slurry of crystalline silicon solar battery, preparation method thereof, and solar battery containing aluminium powder Download PDFInfo
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- CN104157330A CN104157330A CN201410369114.3A CN201410369114A CN104157330A CN 104157330 A CN104157330 A CN 104157330A CN 201410369114 A CN201410369114 A CN 201410369114A CN 104157330 A CN104157330 A CN 104157330A
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Abstract
The invention provides an aluminium powder for the aluminium slurry of a crystalline silicon solar battery, and the composition and preparation method of the aluminium powder. The aluminium powder for the aluminium slurry of the crystalline silicon solar battery comprises the following components in parts by weight: 94.5 to 99 parts of aluminium powder, 0.01 to 0.50 part of boron powder, and 0.5 to 5.0 parts of silicon dioxide powder. The aluminium slurry prepared by the aluminium powder provided by the invention can form heavy diffusion and avoid aluminum layer excessive contraction during aluminium slurry sintering due to the addition of silicon dioxide with D50 less than or equal to 1 micrometer and boron powder with D50 less than or equal to 1 micrometer into the aluminium powder, therefore, the conversion efficiency is improved, and the warping is reduced remarkably.
Description
Technical field
The present invention relates to area of solar cell, especially, relate to a kind of crystal silicon solar energy battery aluminium powder, preparation method and solar cell of containing this aluminium powder for aluminium paste.
Background technology
Solar cell is a kind of semiconductor device that solar energy can be converted to electric energy, and solar cell is accepted can produce generation current therein after solar light irradiation, current generatedly exports by electrode.For the consideration of cost, the silicon chip that battery production is used is more and more thinner, from 220 microns of traditional left and right, drop to 160 microns of present left and right, produce solar cell needed raw material aluminium oar in use, need to stand high temperature sintering, after oversintering, because the coefficient of linear expansion of aluminium and silicon differs, huge (at 20-300 DEG C, the coefficient of expansion of aluminium is 232 × 10
-7/ DEG C, at 20-300 DEG C, the coefficient of expansion of silicon is 26 × 10
-7/ DEG C), cause the aluminium flake warpage after sintering serious, the back surface field BSF layer of solar cell forms imperfection, causes gained conversion efficiency of solar cell low.
In prior art, disclose and in a kind of CN201310117504.7, disclose a kind of high temperature resistant low warpage aluminium paste, this aluminium oar comprises 60 parts～80 parts ball aluminum powder, 0.5 part～6 parts secret glass frits, 0.01～3 part of inorganic additive, 15～35 parts of organic carriers, wherein inorganic additive wolframic acid zirconium, vanadic acid zirconium and basic zirconium phosphate, organic carrier is made up of 10～99 parts of intermediates, 1～89 part of diluent, 0.1～5 part of thixotropic agent BYK410,0.1～5 part of dispersant B YK180.Intermediate is by polymer and solvent composition.This aluminium oar composition is complicated, and wherein multiple compositions need preparation separately.And warpage is 1.1～0.5mm after the preparation of gained aluminium oar, warpage is larger.
Summary of the invention
The object of the invention is to provide a kind of crystal silicon solar energy battery aluminium powder, preparation method and solar cell of containing this aluminium powder for aluminium paste, to solve in prior art the serious technical problem of warpage after crystal silicon solar energy battery aluminium oar sintering.
For achieving the above object, according to an aspect of the present invention, provide a kind of crystal silicon solar energy battery aluminium paste al powder mixt, comprised aluminium powder, boron powder and silicon dioxide powder, wherein boron powder footpath is D
50≤ 1 micron; Silicon dioxide particle diameter is D
50≤ 1 micron.
Further, comprise aluminium powder, the boron powder of 0.01～0.50 weight portion and the silicon dioxide powder of 0.5～5.0 weight portion of 94.5～99 weight portions.
Further, formed by 94.5～99 weight portion aluminium powders, 0.01～0.50 weight portion boron powder and 0.5～5.0 weight portion silicon dioxide powder.
Further, formed by 97.9 weight portion aluminium powders, 0.10 weight portion boron powder and 2.0 weight portion silicon dioxide powders.
Further, the silicon dioxide coefficient of expansion counts 120 × 10 with quartz crystal
-7/ DEG C.
Further, purity >=99.90% of boron powder, boron powder water content≤0.1%; Purity >=98.50% of silicon dioxide, silicon dioxide water content≤0.1%.
A kind of preparation method of above-mentioned aluminium powder is also provided according to a further aspect in the invention, aluminium powder, boron powder, silicon dioxide powder are mixed and obtain aluminium powder.
Further, blend step mixes 0.5～2 hour in V-Mixer.
The crystal silicon solar energy battery that adopts above-mentioned al powder mixt to make is also provided according to a further aspect in the invention.
Further, the warpage of crystal silicon solar energy battery is 0.2mm, and conversion ratio is 18.7%.
The present invention has following beneficial effect:
Provided by the invention by add D in aluminium powder used
50the silicon dioxide of≤1 micron and D
50the boron powder of≤1 micron, by adding of the two, while making to adopt the aluminium oar sintering that this aluminium powder makes, silicon dioxide can not reach molten condition, avoids the edge excess shrinkage of aluminium flake, thereby reduces warpage.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.The present invention is further detailed explanation below.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Aluminium powder provided by the invention comprises 94.5～99 weight portion aluminium powders, 0.01～0.50 weight portion boron powder and 0.5～5.0 weight portion silicon dioxide powder.
Silicon dioxide powder
Under the peak temperature of aluminium powder in sintering process, there is melting, form aluminium film follow-up reproduction when sharply cooling, because the coefficient of expansion of aluminium at 20～300 DEG C is 232 × 10
-7/ DEG C, the coefficient of expansion of crystalline silicon is 26 × 10
-7/ DEG C, the two coefficient of expansion gap is larger, in sintering process, the aluminium film surface that forms shrink serious, thereby produce larger warpage.The silicon dioxide adding in aluminium powder, the coefficient of expansion, in quartz crystal, is 120 × 10
-7/ DEG C, the coefficient of expansion is between aluminium and silicon.When sintering, after silicon dioxide generation melting, the contraction of cooling generation is less again, thereby reduces warpage.The fusing point of silicon dioxide used is 1670 DEG C simultaneously.And temperature peak in sintering process is 720 DEG C.Even temperature reaches peak value in sintering process, also only can there is micro melting in the silicon dioxide being filled in aluminium powder, and the silicon dioxide after melting more cooling back edge shrinkage degree is low.Add the silicon dioxide that melting does not occur wherein can also completely cut off aluminium film and crystal silicon layer simultaneously, the aluminium of high expansion coefficient is contacted with the silicon dioxide of the median coefficient of expansion, the contraction that aluminium film produces on contact-making surface is reduced, avoid aluminium film directly to contact the high shrinkage causing with crystalline silicon.Reduce warpage.Improve conversion ratio.
Boron powder
In crystalline silicon, itself is doped with boron element, and in the time adding the aluminium oar of boron powder to contact with crystalline silicon in sintering process, the boron atom in aluminium oar permeates to crystal silicon layer, on aluminium oar and crystalline silicon contact-making surface, forms the region that boron concentration is higher.The existence in this region can reduce the recombination probability of minority carrier, improves open circuit voltage.Thereby improve the conversion efficiency of gained solar cell.The infiltration of boron powder simultaneously can also promote the combination of silicon dioxide and crystalline silicon, makes its effect that better performance completely cuts off aluminium film and crystalline silicon.Thereby further reduce warpage.
Silicon dioxide and boron powder add in aluminium oar and can bring into play above-mentioned effect in this ratio.The silicon dioxide adding in this ratio and boron powder can also add other can improve the material of aluminium powder performance.
Preferably formed by 94.5～99 weight portion aluminium powders, 0.01～0.50 weight portion boron powder and 0.5～5.0 weight portion silicon dioxide powder.The synergy that now silicon dioxide and boron powder are brought into play reaches more excellent, thereby the warpage of gained solar cell is reduced.
Preferredly formed by 97.9 weight portion aluminium powders, 0.10 weight portion boron powder and 2.0 weight portion silicon dioxide powders.Now the synergy of silicon dioxide and boron powder reaches optimum, thereby the warpage of gained solar cell is down to minimum, reaches 0.2mm.Conversion ratio reaches 18.7%.
It is D50≤1 micron that the particle diameter of silicon dioxide powder and boron powder is preferably boron powder footpath; Silicon dioxide particle diameter is D50≤1 micron.Adopt the silicon dioxide powder of this particle diameter, it is optimum that its diffusion in aluminium oar reaches, and can effectively in aluminium oar, evenly spread, thereby better performance stops, isolates the effect of aluminium powder and crystalline silicon.The boron powder of this particle diameter can better penetrate in crystalline silicon, thereby performance improves the effect of its open circuit voltage, can spread to the contact interface of aluminium powder and crystalline silicon by more effective assistance silicon dioxide simultaneously.
Preferably adopt the silicon dioxide coefficient of expansion to count 120 × 10 with quartz crystal
-7/ DEG C.Now can ensure that silicon dioxide is in sintering process after melting, shrink less, the better effect of the isolated aluminium powder of performance and crystalline silicon.
Silicon dioxide and boron powder adopt conventional chemical pure, preferably adopt purity >=99.90% of boron powder, boron powder water content≤0.1%; Purity >=98.50% of silicon dioxide, silicon dioxide water content≤0.1%.Adopt boron powder and the silicon dioxide of this purity both to reduce cost, ensured again result of use.Can also avoid too much moisture to introduce, reduce silicon dioxide and the diffusion of boron powder in aluminium powder simultaneously.
Another aspect of the present invention also provides a kind of preparation method of above-mentioned aluminium powder, and aluminium powder, boron powder, silicon dioxide powder are mixed and obtain aluminium powder.Aluminium powder provided by the invention is prepared easy, mixes and can play a role.Preferably blend step mixes 0.5～2 hour in V-Mixer.Mix by this condition, can ensure to mix, avoid energy loss, improve mixing efficiency.
Another aspect of the present invention also provides a kind of crystal silicon solar energy battery that adopts above-mentioned aluminium powder.The warpage of this crystal silicon solar energy battery is 0.2mm, and conversion ratio is 18.7%.
Embodiment
In following examples and comparative example, material used and equipment are commercially available.
The preparation method of the formula of aluminium oar, aluminium oar in following examples, the preparation method of solar cell, cell piece warpage detection method, conversion ratio detection method are all carried out according to disclosed method in CN201010560269.7.Aluminium powder mixes the mixing of employing V-type will.Angularity adopts clearance gauge to detect.Conversion efficiency adopts cell piece automatic tester to detect
Embodiment 1
Taking 94.5 weight portion aluminium powders, 0.01 weight portion boron powder, 0.5 weight portion silicon dioxide powder and 1 weight portion bismuth glass powder as raw material, boron powder footpath is D
50=1 micron; Silicon dioxide particle diameter is D
50=1 micron.The silicon dioxide coefficient of expansion counts 120 × 10 with quartz crystal
-7/ DEG C.The purity 99.90% of boron powder, boron powder water content 0.1%; The purity 98.50% of silicon dioxide, silicon dioxide water content 0.1%.
Add in mixer and mix 1 hour, obtain aluminium powder.
Embodiment 2
Taking 94.5 weight portion aluminium powders, 0.01 weight portion boron powder, 0.5 weight portion silicon dioxide powder as raw material, boron powder footpath is D
50=0.7 micron; Silicon dioxide particle diameter is D
50=0.5 micron.The silicon dioxide coefficient of expansion counts 120 × 10 with quartz crystal
-7/ DEG C.The purity 99.99% of boron powder, boron powder water content 0.07%; The purity 99.50% of silicon dioxide, silicon dioxide water content 0.08%.
Add in mixer and mix 0.5 hour, obtain aluminium powder.
Embodiment 3
Taking 99 weight portion aluminium powders, 0.50 weight portion boron powder, 5.0 weight portion silicon dioxide powders and 1 weight portion bismuth glass powder as raw material, boron powder footpath is D
50=0.5 micron; Silicon dioxide particle diameter is D
50=0.4 micron.The silicon dioxide coefficient of expansion counts 120 × 10 with quartz crystal
-7/ DEG C.The purity 99.99% of boron powder, boron powder water content 0.05%; The purity 99.90% of silicon dioxide, silicon dioxide water content 0.07%.
Add in mixer and mix 2 hours, obtain aluminium powder.
Embodiment 4
Taking 99 weight portion aluminium powders, 0.50 weight portion boron powder, 5.0 weight portion silicon dioxide powders as raw material, boron powder footpath is D
50=1 micron; Silicon dioxide particle diameter is D
50=1 micron.The silicon dioxide coefficient of expansion counts 120 × 10 with quartz crystal
-7/ DEG C.The purity 99.90% of boron powder, boron powder water content 0.1%; The purity 98.70% of silicon dioxide, silicon dioxide water content 0.1%.
Add in mixer and mix 1.5 hours, obtain aluminium powder.
Embodiment 5
Be with the difference of embodiment 4: raw material is for to be made up of 97.9 weight portion aluminium powders, 0.10 weight portion boron powder and 2.0 weight portion silicon dioxide powders.
Comparative example 1
Be with the difference of embodiment 4: do not add silicon dioxide.
Comparative example 2
Be with the difference of embodiment 4: do not add boron powder.
Comparative example 3
Be with the difference of embodiment 4: do not add silicon dioxide, boron powder.
In embodiment 1～5 and comparative example 1～3, gained aluminium powder is for the preparation of conversion ratio and the warpage of the crystal silicon solar cell sheet obtaining, and data result is listed in table 1.
Table 1 embodiment 1～5 and comparative example 1～3 gained aluminium powder make conversion ratio and the warpage result table of cell piece
From table 1, by adding in aluminium powder after boron powder and silicon dioxide powder, the conversion ratio of gained solar battery sheet and warpage significantly can be reduced, thereby play the effect that improves gained solar cell properties.Can be found out by the data obtained in embodiment 1～5, adopt after aluminium powder provided by the invention, warpage is reduced to 0.2mm, and transformation efficiency obviously improves.And not using gained in silicon dioxide, boron powder gained solar cell comparative example 3, its warpage to reach 1.5mm, conversion ratio is also lower.And only add wherein any one, and can not play effectively reducing cell piece warpage, improve the effect of conversion ratio, as can be seen here, boron powder and silicon dioxide have synergy, and interpolation can not be played this reduction warpage separately, improves the effect of conversion ratio.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a crystal silicon solar energy battery aluminium paste al powder mixt, is characterized in that, described al powder mixt comprises aluminium powder, boron powder and silicon dioxide powder, and wherein said boron powder footpath is D
50≤ 1 micron; Described silicon dioxide particle diameter is D
50≤ 1 micron.
2. al powder mixt according to claim 1, is characterized in that, described al powder mixt comprises aluminium powder, the boron powder of 0.01～0.50 weight portion and the silicon dioxide powder of 0.5～5.0 weight portion of 94.5～99 weight portions.
3. al powder mixt according to claim 2, is characterized in that, described al powder mixt is made up of 94.5～99 weight portion aluminium powders, 0.01～0.50 weight portion boron powder and 0.5～5.0 weight portion silicon dioxide powder.
4. al powder mixt according to claim 3, is characterized in that, described al powder mixt is made up of 97.9 weight portion aluminium powders, 0.10 weight portion boron powder and 2.0 weight portion silicon dioxide powders.
5. al powder mixt according to claim 4, is characterized in that, the described silicon dioxide coefficient of expansion counts 120 × 10 with quartz crystal
-7/ DEG C.
6. al powder mixt according to claim 5, is characterized in that, purity >=99.90% of described boron powder, described boron powder water content≤0.1%; Purity >=98.50% of described silicon dioxide, described silicon dioxide water content≤0.1%.
7. a preparation method for al powder mixt described in any one in claim 1～6, is characterized in that, aluminium powder, boron powder, silicon dioxide powder are mixed and obtain described al powder mixt.
8. method according to claim 7, is characterized in that, described blend step mixes 0.5～2 hour in V-Mixer.
9. the crystal silicon solar energy battery that the employing al powder mixt as described in any one in claim 1～6 is made.
10. solar cell according to claim 9, is characterized in that, the warpage≤0.5mm of described crystal silicon solar energy battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410369114.3A CN104157330B (en) | 2014-07-30 | 2014-07-30 | Crystal silicon solar energy battery aluminium paste aluminium powder, preparation method and the solar cell containing the aluminium powder |
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|---|---|---|---|
| CN201410369114.3A CN104157330B (en) | 2014-07-30 | 2014-07-30 | Crystal silicon solar energy battery aluminium paste aluminium powder, preparation method and the solar cell containing the aluminium powder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106784049A (en) * | 2016-12-30 | 2017-05-31 | 苏州阿特斯阳光电力科技有限公司 | The preparation method and its obtained battery of a kind of local doped crystal silicon solar cell |
| CN107068240A (en) * | 2017-02-20 | 2017-08-18 | 江苏瑞德新能源科技有限公司 | A kind of back silver paste |
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| US20070215202A1 (en) * | 2006-03-20 | 2007-09-20 | Ferro Corporation | Aluminum-boron solar cell contacts |
| CN103065701A (en) * | 2012-11-29 | 2013-04-24 | 乐凯胶片股份有限公司 | Aluminum paste for silicon solar cell |
| CN103123812A (en) * | 2013-02-20 | 2013-05-29 | 江苏晨电太阳能光电科技有限公司 | Crystalline silicon solar cell aluminum paste |
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2014
- 2014-07-30 CN CN201410369114.3A patent/CN104157330B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070215202A1 (en) * | 2006-03-20 | 2007-09-20 | Ferro Corporation | Aluminum-boron solar cell contacts |
| CN103065701A (en) * | 2012-11-29 | 2013-04-24 | 乐凯胶片股份有限公司 | Aluminum paste for silicon solar cell |
| CN103123812A (en) * | 2013-02-20 | 2013-05-29 | 江苏晨电太阳能光电科技有限公司 | Crystalline silicon solar cell aluminum paste |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106784049A (en) * | 2016-12-30 | 2017-05-31 | 苏州阿特斯阳光电力科技有限公司 | The preparation method and its obtained battery of a kind of local doped crystal silicon solar cell |
| CN106784049B (en) * | 2016-12-30 | 2019-12-10 | 苏州阿特斯阳光电力科技有限公司 | Preparation method of local doped crystalline silicon solar cell and prepared cell |
| CN107068240A (en) * | 2017-02-20 | 2017-08-18 | 江苏瑞德新能源科技有限公司 | A kind of back silver paste |
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| CN104157330B (en) | 2017-09-12 |
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