CN107331433B - A kind of passivation emitter solar cell front side silver paste - Google Patents
A kind of passivation emitter solar cell front side silver paste Download PDFInfo
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- CN107331433B CN107331433B CN201710522213.4A CN201710522213A CN107331433B CN 107331433 B CN107331433 B CN 107331433B CN 201710522213 A CN201710522213 A CN 201710522213A CN 107331433 B CN107331433 B CN 107331433B
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- Prior art keywords
- silver paste
- front side
- solar cell
- inorganic binder
- side silver
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000004332 silver Substances 0.000 title claims abstract description 56
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 56
- 238000002161 passivation Methods 0.000 title claims abstract description 26
- 239000011230 binding agent Substances 0.000 claims abstract description 26
- 238000005245 sintering Methods 0.000 claims abstract description 25
- 239000002562 thickening agent Substances 0.000 claims abstract description 17
- 239000003960 organic solvent Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 9
- -1 sodium hexafluoroantimonate Chemical compound 0.000 claims abstract description 7
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 5
- 239000000292 calcium oxide Substances 0.000 claims abstract description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 229920002396 Polyurea Polymers 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- XSOKHXFFCGXDJZ-UHFFFAOYSA-N telluride(2-) Chemical compound [Te-2] XSOKHXFFCGXDJZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 8
- 239000004094 surface-active agent Substances 0.000 claims description 7
- MRPWWVMHWSDJEH-UHFFFAOYSA-N antimony telluride Chemical compound [SbH3+3].[SbH3+3].[TeH2-2].[TeH2-2].[TeH2-2] MRPWWVMHWSDJEH-UHFFFAOYSA-N 0.000 claims description 4
- 229910052785 arsenic Inorganic materials 0.000 claims description 4
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 4
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 4
- 239000000194 fatty acid Substances 0.000 claims description 4
- 229930195729 fatty acid Natural products 0.000 claims description 4
- 229910052797 bismuth Inorganic materials 0.000 claims description 3
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 3
- 239000004359 castor oil Substances 0.000 claims description 3
- 235000019438 castor oil Nutrition 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 125000005313 fatty acid group Chemical group 0.000 claims description 3
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 238000000518 rheometry Methods 0.000 claims description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 2
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 claims 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims 1
- 238000009766 low-temperature sintering Methods 0.000 abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 101001073212 Arabidopsis thaliana Peroxidase 33 Proteins 0.000 description 9
- 101001123325 Homo sapiens Peroxisome proliferator-activated receptor gamma coactivator 1-beta Proteins 0.000 description 9
- 102100028961 Peroxisome proliferator-activated receptor gamma coactivator 1-beta Human genes 0.000 description 9
- 239000000306 component Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 5
- 239000002002 slurry Substances 0.000 description 3
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000001856 Ethyl cellulose Substances 0.000 description 2
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 2
- 239000000020 Nitrocellulose Substances 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229920000180 alkyd Polymers 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229920001249 ethyl cellulose Polymers 0.000 description 2
- 235000019325 ethyl cellulose Nutrition 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 2
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001220 nitrocellulos Polymers 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- NQBXSWAWVZHKBZ-UHFFFAOYSA-N 2-butoxyethyl acetate Chemical compound CCCCOCCOC(C)=O NQBXSWAWVZHKBZ-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910017982 Ag—Si Inorganic materials 0.000 description 1
- 229910001152 Bi alloy Inorganic materials 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 101100296544 Caenorhabditis elegans pbo-5 gene Proteins 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000004443 Ricinus communis Nutrition 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004205 SiNX Inorganic materials 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- XNRNVYYTHRPBDD-UHFFFAOYSA-N [Si][Ag] Chemical group [Si][Ag] XNRNVYYTHRPBDD-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- YADSGOSSYOOKMP-UHFFFAOYSA-N lead dioxide Inorganic materials O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000037230 mobility Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000008159 sesame oil Substances 0.000 description 1
- 235000011803 sesame oil Nutrition 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- RBNWAMSGVWEHFP-UHFFFAOYSA-N trans-p-Menthane-1,8-diol Chemical compound CC(C)(O)C1CCC(C)(O)CC1 RBNWAMSGVWEHFP-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H01L31/022441—
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Photovoltaic Devices (AREA)
- Conductive Materials (AREA)
Abstract
The invention discloses a kind of passivation emitter solar cell front side silver paste, the main component of front side silver paste is organic carrier, inorganic binder, silver powder and sintering aids；Wherein organic carrier includes organic solvent, thickener and other auxiliary agents, and it includes calcium oxide in inorganic binder that sintering aids, which are sodium hexafluoroantimonate,.For passivation emitter solar cell front side silver paste of the present invention by adjusting the composition of inorganic binder, inorganic binder activity is low, and reduction inorganic binder is reacted with passivating film, and silver paste and silicon wafer contact portion is avoided to form a large amount of complex centres；Inorganic binder is sintered that peak temperature is lower, avoids aggravating reacting for inorganic binder and passivating film under hot conditions.Passivation emitter solar cell front side silver paste of the present invention reduces and widens sintering window, the contact performance still having had at a relatively low sintering temperature has better low-temperature sintering characteristic by the way that sintering aids are added.
Description
Technical field
The present invention relates to electric slurry technical fields, and in particular to a kind of passivation emitter solar cell front side silver paste.
Background technique
The characteristics of PERC solar battery, that is, passivation emitter back-contact cell, battery, is: (1) positive and negative the two of battery
Face all deposits passivating film, passivating film has antireflective and increases the corresponding dual function of feux rouges, and reduction carrier is overleaf
It is compound；(2) by slotting in laser technology overleaf dielectric layer, expose linear or dotted silicon substrate, the aluminium paste of back surface field is then
It directly overlays and forms localized contact with silicon substrate in backside passivation film.According to the design feature of PERC battery, battery needs double
Face passivation and rear side local contact improve cell conversion efficiency so that surface recombination be greatly reduced.
Industry practice shows although the front side silver paste of conventional batteries is able to satisfy the basic using effect of PERC battery, but
Since sintering window is integrally biased to high temperature, low-temperature sintering window is not wide enough, can bring damage, thin grid line depth-width ratio table to passivation layer
It is existing not good enough, to limit the performance of PERC battery efficiency potentiality.
Summary of the invention
It is an object of the invention to overcome defect existing in the prior art, provide that a kind of low-temperature sintering characteristic is good, energy
The passivation emitter solar cell front side silver paste of preferably thin grid line depth-width ratio is provided.
To achieve the above object, the technical solution of the present invention is as follows: a kind of passivation emitter solar cell front side silver paste,
It is characterized in that, the main component of front side silver paste is organic carrier, inorganic binder, silver powder and sintering aids；Wherein have airborne
Body includes organic solvent, thickener and other auxiliary agents, and sintering aids are sodium hexafluoroantimonate, includes oxidation in inorganic binder
Calcium.
Calcium oxide can inhibit the migration of the sodium ion in sintering aids, improve the chemical stability of glass, and addition sintering promotees
The peak temperature that silver paste sintering can be reduced into agent sodium hexafluoroantimonate, makes the high-temperature sintering window of slurry significantly broaden, and has more preferable
Low-temperature sintering characteristic.
Organic solvent is similar with traditional silver paste organic solvent, is not particularly limited, for selected from terpinol, polyol ester,
Butyl, 2-Butoxyethyl acetate, diethylene glycol ether acetate, at least one in butyl acetate
Kind.
Further preferred technical solution is that the main component and weight percent of front side silver paste are respectively as follows: organic carrier
10~25%, inorganic binder 2~8%, sintering aids 0.1~3%, silver powder 70~85%；Organic solvent in organic carrier
Weight percent be 60~90%, the weight percent of thickener is 2~20% in organic carrier.
Preferred technical solution is that inorganic binder includes PbO, Bi2O3、B2O3、SiO2、Al2O3, ZnO and CaO.
Further preferred technical solution is, based on inorganic binder weight 100%, material composition are as follows: PbO0.5~
5%, Bi2O355~80%, B2O35~20%, SiO25~14%, Al2O33~8%, ZnO1~6%, CaO4~10%.It is inorganic
The combination of binder has the softening point of lower glass, good in 420~500 DEG C of temperature range internal mobilities, cell piece sintering
When processing, above-mentioned inorganic additive package has good corrosiveness to the silicon nitride anti-reflecting film of battery front side, is conducive to silver-
Silicon forms good Ohmic contact,
In order to improve the filament printing performance of silver paste, reach better depth-width ratio, preferred technical solution is, it is described other
Auxiliary agent includes surfactant and rheological agent, and the surfactant is fatty acid amide, and the rheological agent is modified hydrogenated castor
Sesame oil, polyamide wax or polyurea type auxiliary rheological agents.
Preferred technical solution is, polyurea type auxiliary rheological agents are dissaving structure polyureas, relative molecular weight is 3200~
3600.The rheological characteristic and recoverability of the auxiliary rheological agents of general linear structure are better than dissaving structure, but by dissaving structure
Stablize as auxiliary rheological agents for complicated network structure, silver paste dispersion in silver paste, can be formed with thickener, the electrode obtained
Film is fine and close, and thickness is uniform, and surface is smooth, forms good Ohmic contact with silicon wafer.
The optional range of thickener commonly used in the prior art include ethyl cellulose, hydroxymethyl cellulose, nitrocellulose,
Acrylic resin, alkyd resin, rosin resin, phenolic rosin resin subtract to advanced optimize the filament printing performance of silver paste
Filament sagging phenomenon in few silver paste drying course, preferred technical solution are that the thickener is cellulose type thickener.It is fine
The optional range for tieing up plain type thickener includes ethyl cellulose, hydroxymethyl cellulose, nitrocellulose.Thickener and hyperbranched knot
Structure polyureas rheological agent uses simultaneously, can achieve synergy, while reducing the additive amount of above two substance in silver paste.
In order to optimize the electric conductivity of front electrode, preferred technical solution is that silver powder is spherical silver powder, the ratio of silver powder
1~2m of surface area2/g；2.5~3.5g/cm of tap density3.Specifically, the combination of silver powder selection model flake silver powder.
Preferred technical solution is to further include in passivation emitter solar cell front side silver paste selected from bismuth telluride, telluride
At least one of arsenic and antimony telluride alloy powder, the weight percent of alloy powder is 0.01~0.15% in silver paste.Alloy
Powder has lower fusing point, and alloy powder fusing at a sintering temperature is filled in silver powder gap.Conjunction with pyroelectric effect
Bronze end helps to subtract emission layer compared with burn-through SiNx under the conditions of low temperature, forms Ag-Si Ohmic contact, promotes open-circuit voltage.
Preferred technical solution is that the partial size of silver powder is 0.2~1.7 μm, and the partial size of alloy powder is 0.8~2 μm.Alloy
Powder is evenly distributed in silver positive electrode and grid line, and the consistency of back electrode obtained by the silver paste of above-mentioned silver powder particle diameter distribution is high, reduces
The resistance of electric current transmission.
The advantages and beneficial effects of the present invention are:
Passivation emitter solar cell front side silver paste of the present invention reduces by the way that sintering aids are added and widens sintering window
Mouthful, the contact performance still having had at a relatively low sintering temperature has better low-temperature sintering characteristic.
Specific embodiment
With reference to embodiment, the specific embodiment of the present invention is further described.Following embodiment is only used for more
Add and clearly demonstrate technical solution of the present invention, and not intended to limit the protection scope of the present invention.
The composition of front side silver paste:
The composition of PERC cell front side silver paste can refer to the composition of traditional front side silver paste, such as Chinese patent
Disclosed in CN103000255A.
The front side silver paste composition of embodiment 1-5 see the table below:
Inorganic binder is inorganic binder (PbO disclosed in embodiment 4 in CN103000255A in embodiment 1
78%, SiO210%, Al2O32%, MgO 1%, ZnO 9%)；Wherein the organic solvent in organic carrier is diethylene glycol second
Ether acetate, the weight percent of organic solvent is 85% in organic carrier, does not include surfactant and rheology in embodiment 1
Agent.
The specific surface area of 1 silver powder of embodiment is 1~2m2/g；2.5~3.5g/cm of tap density3.Silver powder selects conventional particle size
0.2~1.7 μm；Thickener is alkyd resin, and sintering aids are sodium hexafluoroantimonate.
Embodiment 2-5 inorganic binder is PbO5%, Bi2O350%, B2O320%, SiO214%, Al2O33%,
ZnO1%, CaO7%.
6 component of embodiment is only that the composition of inorganic binder with embodiment 5, difference are as follows: PbO0.5%, Bi2O380%,
B2O35%, SiO25%, Al2O33%, ZnO2%, CaO4.5%；
7 component of embodiment is only that the composition of inorganic binder with embodiment 5, difference are as follows: PbO2%, Bi2O355%,
B2O310%, SiO214%, Al2O35%, ZnO6%, CaO8%.
The weight percentages of components of inorganic binder is adjusted, peak temperature corresponding change is sintered.
Compared with Example 7, difference is that joined surfactant is fatty acid amide to embodiment 8, and rheological agent is choosing
From modified hydrogenated castor oil.Fatty acid amide accounts for the 0.5% of positive silver paste weight, and modified hydrogenated castor oil accounts for positive silver paste weight
3%, reduce the dosage of organic solvent.
Embodiment 9 and the difference of embodiment 8 are: rheological agent is linear structure polyureas (being usually used in coating), polyureas
Relative molecular weight is 2700.
Embodiment 10-12 and the difference of embodiment 9 are: rheological agent is dissaving structure polyureas, the average molecular of polyureas
Amount is 3200,3600 and 3400.
Embodiment 13 and the difference of embodiment 12 are that thickener is the NC Nitroncellulose of cellulose type thickener.
Embodiment 14 and the difference of embodiment 13 are, further include telluride in passivation emitter solar cell front side silver paste
Bismuth alloy powder, the weight percent of alloy powder is 0.01% in silver paste, the partial size of bismuth telluride alloy powder is 0.05~
0.15 μm, reduce the dosage of organic carrier.
Embodiment 15 and the difference of embodiment 14 are, further include telluride in passivation emitter solar cell front side silver paste
Arsenic and antimony telluride are with the combination of weight ratio 1:1, and the weight percent of alloy powder is 0.15% in silver paste.
Embodiment 16 and the difference of embodiment 14 are, further include telluride in passivation emitter solar cell front side silver paste
Arsenic and antimony telluride are with the combination of weight ratio 1:1, and the weight percent of alloy powder is 0.3% in silver paste.
Comparative example
Comparative example 1 is added without sintering aids sodium hexafluoroantimonate using the inorganic binder of component same as Example 1.
Comparative example 2 uses inorganic binder same as Example 2；
Silver paste performance test
The slurry prepared is printed on monocrystalline silicon PERC cell backside by silk-screen printing technique, then prints by traditional handicraft
PERC positive silver paste, positive silver paste；By drying, PERC solar cell sample is made after sintering, to embodiment and comparative example institute
It obtains PERC solar cell sample and carries out electric performance test and tensile test.(Eff is transfer efficiency, and Uoc is open-circuit voltage, Rs
For series resistance)
Test result see the table below:
Based on certain silver paste component, Surfactant, alloy powder and thickener are further selected, silver paste and sintering
The same embodiment of back performance of silver electrode variation tendency afterwards.
Under the conditions of comparative example embodiment 8-13 same coated (thin grid line width is 40 μm), practical grid line is wide by about 41~43
μm, the thin grid line of gained is humping, and depth-width ratio is respectively 0.31,0.32,0.35,0.36,0.35,0.39, the institute of comparative example 1 and 2
Obtaining actual linewidth grid is about 47~49, and depth-width ratio is 0.2 or so.
It is only the preferred embodiment of the present invention described in upper, it is noted that for those skilled in the art
For, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of passivation emitter solar cell front side silver paste, which is characterized in that the main component of front side silver paste is airborne to have
Body, inorganic binder, silver powder and sintering aids；Wherein organic carrier includes organic solvent, thickener and other auxiliary agents, sintering
Promotor is sodium hexafluoroantimonate, includes calcium oxide in inorganic binder；Other described auxiliary agents include surfactant and rheological agent；
It further include selected from least one of bismuth telluride, arsenic telluride and antimony telluride alloy in passivation emitter solar cell front side silver paste
Powder, the weight percent of alloy powder is 0.01~0.15% in silver paste.
2. passivation emitter solar cell front side silver paste according to claim 1, which is characterized in that the master of front side silver paste
Component and weight percent is wanted to be respectively as follows: organic carrier 10~25%, inorganic binder 2~8%, sintering aids 0.1~3%, silver
Powder 70~85%；The weight percent of organic solvent is 60~90% in organic carrier, the weight percent of thickener in organic carrier
Than being 2~20%.
3. passivation emitter solar cell front side silver paste according to claim 2, which is characterized in that inorganic binder packet
Containing PbO, Bi2O3、B2O3、SiO2、Al2O3, ZnO and CaO.
4. passivation emitter solar cell front side silver paste according to claim 3, which is characterized in that press inorganic binder
Weight 100% is counted, material composition are as follows: PbO0.5~5%, Bi2O355~80%, B2O35~20%, SiO25~14%, Al2O33~
8%, ZnO1~6%, CaO4~10%.
5. passivation emitter solar cell front side silver paste according to claim 1, which is characterized in that the surface-active
Agent is fatty acid amide, and the rheological agent is modified hydrogenated castor oil, polyamide wax or polyurea type auxiliary rheological agents.
6. passivation emitter solar cell front side silver paste according to claim 5, which is characterized in that polyurea type rheology helps
Agent is dissaving structure polyureas, and relative molecular weight is 3200~3600.
7. passivation emitter solar cell front side silver paste according to claim 5, which is characterized in that the thickener is
Cellulose type thickener.
8. passivation emitter solar cell front side silver paste according to claim 1, which is characterized in that silver powder is spherical
Silver powder, 1~2m of specific surface area of silver powder2/g；2.5~3.5g/cm of tap density3。
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| CN108586832B (en) * | 2018-03-28 | 2020-11-13 | 山东建邦胶体材料有限公司 | Special carrier containing thermal gel for solar cell front silver paste and preparation method thereof |
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