CN116864181B - Conductive silver paste for solar cell and preparation method thereof - Google Patents
Conductive silver paste for solar cell and preparation method thereof Download PDFInfo
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- CN116864181B CN116864181B CN202311018722.5A CN202311018722A CN116864181B CN 116864181 B CN116864181 B CN 116864181B CN 202311018722 A CN202311018722 A CN 202311018722A CN 116864181 B CN116864181 B CN 116864181B
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 238000002360 preparation method Methods 0.000 title claims description 47
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 60
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims abstract description 59
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002042 Silver nanowire Substances 0.000 claims abstract description 46
- 239000003607 modifier Substances 0.000 claims abstract description 43
- 239000002002 slurry Substances 0.000 claims abstract description 39
- 239000002608 ionic liquid Substances 0.000 claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000002904 solvent Substances 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 19
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003822 epoxy resin Substances 0.000 claims abstract description 18
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims description 97
- 239000000243 solution Substances 0.000 claims description 71
- 238000001035 drying Methods 0.000 claims description 56
- 238000005406 washing Methods 0.000 claims description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 32
- IAZSXUOKBPGUMV-UHFFFAOYSA-N 1-butyl-3-methyl-1,2-dihydroimidazol-1-ium;chloride Chemical compound [Cl-].CCCC[NH+]1CN(C)C=C1 IAZSXUOKBPGUMV-UHFFFAOYSA-N 0.000 claims description 30
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 29
- 239000007864 aqueous solution Substances 0.000 claims description 24
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 20
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 claims description 18
- 239000007853 buffer solution Substances 0.000 claims description 17
- QKNYBSVHEMOAJP-UHFFFAOYSA-N 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydron;chloride Chemical compound Cl.OCC(N)(CO)CO QKNYBSVHEMOAJP-UHFFFAOYSA-N 0.000 claims description 16
- 229960003638 dopamine Drugs 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 10
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 10
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 10
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims description 9
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 8
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 claims description 8
- 235000010413 sodium alginate Nutrition 0.000 claims description 8
- 239000000661 sodium alginate Substances 0.000 claims description 8
- 229940005550 sodium alginate Drugs 0.000 claims description 8
- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical compound S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 claims description 7
- 229920001661 Chitosan Polymers 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 7
- 239000012286 potassium permanganate Substances 0.000 claims description 7
- MQJKPEGWNLWLTK-UHFFFAOYSA-N Dapsone Chemical group C1=CC(N)=CC=C1S(=O)(=O)C1=CC=C(N)C=C1 MQJKPEGWNLWLTK-UHFFFAOYSA-N 0.000 claims description 6
- 238000000498 ball milling Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000008055 phosphate buffer solution Substances 0.000 claims description 6
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical group COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 claims description 6
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 17
- 238000002834 transmittance Methods 0.000 abstract description 10
- 238000003466 welding Methods 0.000 abstract description 10
- 239000011159 matrix material Substances 0.000 abstract description 3
- 229920005989 resin Polymers 0.000 abstract description 2
- 239000011347 resin Substances 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 20
- 230000001105 regulatory effect Effects 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 6
- -1 graphene accommodation-modified silver nanowires Chemical class 0.000 description 5
- 230000006872 improvement Effects 0.000 description 3
- 238000009210 therapy by ultrasound Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000870 ultraviolet spectroscopy 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
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
-
- 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
Abstract
The invention relates to the technical field of conductive silver paste, and in particular discloses conductive silver paste for a solar cell, which comprises the following raw materials in parts by weight: 15 to 25 parts of glycidyl ether epoxy resin with the weight average molecular weight of 200 to 300, 35 to 40 parts of graphene-modified silver nanowires, 8 to 12 parts of potassium titanate whisker modifier, 10 to 15 parts of ionic liquid slurry, 2 to 3 parts of curing agent and 15 to 20 parts of solvent. According to the conductive silver paste of the solar cell, the glycidyl ether epoxy resin is used as a resin matrix material, and the graphene is added to regulate and modify the silver nanowire and the potassium titanate whisker modifier to prepare the conductive silver paste, so that the conductive silver paste is synergistic, the welding tension performance and the light transmittance of the product are optimized, the performance of the product and the performance of the product are coordinated and improved, and meanwhile, the conductivity of the product still has an excellent performance effect.
Description
Technical Field
The invention relates to the technical field of conductive silver paste, in particular to conductive silver paste for a solar cell and a preparation method thereof.
Background
Solar cells are devices that convert light energy into electrical energy through the photoelectric effect. The working principle of the solar cell is as follows: when sunlight irradiates on the p-n junction of the crystalline silicon semiconductor, a new hole-electron pair is formed, under the action of an electric field of the p-n junction, holes flow from the n region to the p region, electrons flow from the p region to the n region, and a current is formed after a circuit is connected. The raw materials of the conductive silver paste for the solar cell are mostly glass powder, silver powder and organic adhesive, the raw materials are more conventional, the welding tension performance of the prepared silver paste is poor, the welding of a photovoltaic module is affected, meanwhile, the light transmittance of the silver paste is poor, the use is affected, the welding tension performance and the light transmittance of a product are difficult to coordinate and improve on the basis of ensuring conductivity in the prior art, and the use efficiency of the product is limited.
Disclosure of Invention
In view of the drawbacks of the prior art, an object of the present invention is to provide a conductive silver paste for a solar cell and a method for preparing the same, so as to solve the problems set forth in the background art.
The invention solves the technical problems by adopting the following technical scheme:
the invention provides conductive silver paste for a solar cell, which comprises the following raw materials in parts by weight:
15 to 25 parts of glycidyl ether epoxy resin with the weight average molecular weight of 200 to 300, 35 to 40 parts of graphene-modified silver nanowires, 8 to 12 parts of potassium titanate whisker modifier, 10 to 15 parts of ionic liquid slurry, 2 to 3 parts of curing agent and 15 to 20 parts of solvent.
Preferably, the conductive silver paste for the solar cell comprises the following raw materials in parts by weight:
20 parts of glycidyl ether epoxy resin with weight average molecular weight of 250, 37.5 parts of graphene-modified silver nanowire, 10 parts of potassium titanate whisker modifier, 12.5 parts of ionic liquid slurry, 2.5 parts of curing agent and 17.5 parts of solvent.
Preferably, the curing agent is diamino diphenyl sulfone: the solvent is propylene glycol methyl ether acetate.
Preferably, the preparation method of the graphene-modified silver nanowire comprises the following steps:
s01: adding 10-15 parts of silver nanowires into 25-30 parts of concentrated hydrochloric acid, uniformly stirring, washing with water, drying, transferring into 20-30 parts of sodium hydroxide solution with mass fraction of 5%, fully stirring, washing with water, and drying to obtain pre-improved silver nanowires;
s02: adding 3-6 parts of graphene regulator and 1-3 parts of sodium dodecyl benzene sulfonate into 10-15 parts of Tris-HCl buffer solution, stirring for 5-10 min at a rotating speed of 800-1200 r/min, and obtaining a first modified liquid after stirring;
s03: adding 8-12 parts of pre-improved silver nanowires into 15-20 parts of dopamine solution, then adding 2-5 parts of ethylenediamine, and stirring fully to obtain a second modified solution;
s04: and mixing, stirring and reacting the second modified liquid and the first modified liquid according to a weight ratio of 3:1, wherein the stirring temperature is 48-50 ℃, the stirring rotating speed is 1000-1500 r/min, the stirring time is 25-30 min, and the graphene-modified silver nanowire is obtained after the stirring is finished, water washing and drying.
Preferably, the pH value of the Tris-HCl buffer solution is 8-9; the mass fraction of the dopamine solution is 4-6%.
Preferably, the preparation method of the graphene regulator comprises the following steps:
and (3) carrying out heat treatment on graphene at 300-350 ℃ for 5-10 min, cooling to 75-80 ℃ at a speed of 1-3 ℃/min, immersing into a barium nitrate aqueous solution with a mass fraction of 6-10%, stirring and cooling, cooling to room temperature, washing with water, and drying to obtain the graphene regulator.
Preferably, the preparation method of the potassium titanate whisker modifier comprises the following steps:
s11: adding potassium titanate whisker into a potassium permanganate solution with the mass fraction of 5% according to the weight ratio of 1:5, uniformly dispersing, washing with water, drying, then sending the potassium titanate whisker into a kettle at the temperature of 210-220 ℃ for heat treatment for 5-10 min, and naturally cooling to room temperature;
s12: immersing the S11 product into yttrium nitrate solution with the mass fraction of 5%, performing ultrasonic dispersion for 10-20 min, and performing ultrasonic power of 350-400W, and performing ultrasonic finishing, washing and drying;
s13: adding the S12 product into a sodium alginate solution with the mass fraction of 8% according to the weight ratio of 1:6, then adding a phosphate buffer solution with the pH value of 5.5 and accounting for 2-5% of the total amount of the S12 product and sodium lignin sulfonate with the total amount of 4-8% of the total amount of the S12 product, stirring and reacting for 35-45 min at the rotating speed of 450-550 r/min, and washing and drying to obtain the potassium titanate whisker modifier.
Preferably, the preparation method of the ionic liquid slurry comprises the following steps:
mixing and stirring 1-butyl-3-methylimidazole chloride aqueous solution and chitosan solution with the mass fraction of 5% uniformly according to the weight ratio of 1:3;
then adding lanthanum nitrate solution with the mass fraction of 6% and the total amount of 1-butyl-3-methylimidazole chloride of 2-5%, and silane coupling agent KH560 with the total amount of 1-3-methylimidazole chloride of 1-3%, and stirring and uniformly mixing to obtain liquid slurry.
Preferably, the mass fraction of the 1-butyl-3-methylimidazole chloride in the 1-butyl-3-methylimidazole chloride aqueous solution is 25-30%.
The invention also provides a preparation method of the conductive silver paste for the solar cell, which comprises the following steps:
step one: adding the graphene-modified silver nanowire, the potassium titanate whisker modifier and the ionic liquid slurry into a ball mill, ball milling at a speed of 1500-1700 r/min for 35-40 min, washing with water, and drying to prepare a pre-additive;
step two: and dispersing the glycidyl ether epoxy resin with the weight average molecular weight of 200-300, the pre-additive, the curing agent and the solvent at the speed of 500-600 r/min for 15-20 min, and obtaining the conductive silver paste for the solar cell.
Compared with the prior art, the invention has the following beneficial effects:
according to the conductive silver paste of the solar cell, the glycidyl ether epoxy resin is adopted as a resin matrix material, and the graphene is added to regulate and modify the silver nanowire and the potassium titanate whisker modifier to prepare, so that the effects are enhanced together, the welding tension performance and the light transmittance of the product are optimized, the performance of the product is improved in a coordinated manner, meanwhile, the conductivity of the product still has excellent performance effects, the graphene regulates and modifies the silver nanowire and the potassium titanate whisker modifier to adopt ionic liquid slurry to be optimized in a coordinated manner, the interfacial property of raw materials of a product system is obviously improved, the combination effect among the raw materials of the product is improved, and the performance effect of the product is further improved;
the graphene-regulated modified silver nanowire is prepared by sequentially pretreating a silver nanowire by concentrated hydrochloric acid and sodium hydroxide, optimizing the activity and dispersity of the silver nanowire, matching a first modified liquid consisting of a graphene regulator, sodium dodecyl benzene sulfonate and Tris-HCl buffer solution with a second modified liquid formed by the pre-improved silver nanowire, a dopamine solution and ethylenediamine, matching the first modified liquid and the second modified liquid together for optimization, and matching raw material auxiliary agents with graphene to jointly modify the silver nanowire, so that the effect of the graphene-regulated modified silver nanowire in a product is improved, the welding tension performance, the light transmittance and the conductivity of the product are improved, and meanwhile, the graphene regulator is matched with a barium nitrate aqueous solution for common blending modification by heat treatment and cooling at 75-80 ℃, so that the prepared graphene is better optimized and improved;
simultaneously, the potassium titanate whisker modifier adopts potassium titanate whisker to be distributed in a matrix, and the potassium titanate whisker is cooperated with graphene to regulate the modified silver nanowire to cooperate, so that the performance effect of a system is improved, simultaneously, the potassium titanate whisker is treated by adopting potassium permanganate solution, is matched with heat treatment for 5-10 min at 210-220 ℃, the activity of the whisker is optimized, and is matched with sodium alginate solution, phosphate buffer solution with pH value of 5.5 and sodium lignin sulfonate to cooperate and improve through immersing in yttrium nitrate solution, the cooperation effect of the potassium titanate whisker and the graphene to regulate the modified silver nanowire is enhanced by adopting the combined optimization of the potassium titanate whisker and sodium lignin sulfonate, and meanwhile, the ionic liquid slurry adopts 1-butyl-3-methylimidazole chloride aqueous solution, chitosan solution, lanthanum nitrate solution and silane coupling agent KH560, and through the mutual combination of raw materials, the prepared ionic liquid slurry is better improved on the interface of the graphene regulating modified silver nanowire and the potassium titanate whisker, so that the cooperation effect between the raw materials is improved, and the performance of the product is further optimized.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The conductive silver paste for the solar cell comprises the following raw materials in parts by weight:
15 to 25 parts of glycidyl ether epoxy resin with the weight average molecular weight of 200 to 300, 35 to 40 parts of graphene-modified silver nanowires, 8 to 12 parts of potassium titanate whisker modifier, 10 to 15 parts of ionic liquid slurry, 2 to 3 parts of curing agent and 15 to 20 parts of solvent.
Preferably, the conductive silver paste for the solar cell comprises the following raw materials in parts by weight:
20 parts of glycidyl ether epoxy resin with weight average molecular weight of 250, 37.5 parts of graphene-modified silver nanowire, 10 parts of potassium titanate whisker modifier, 12.5 parts of ionic liquid slurry, 2.5 parts of curing agent and 17.5 parts of solvent.
The curing agent of this example is diamino diphenyl sulfone: the solvent is propylene glycol methyl ether acetate.
The preparation method of the graphene-modified silver nanowire comprises the following steps:
s01: adding 10-15 parts of silver nanowires into 25-30 parts of concentrated hydrochloric acid, uniformly stirring, washing with water, drying, transferring into 20-30 parts of sodium hydroxide solution with mass fraction of 5%, fully stirring, washing with water, and drying to obtain pre-improved silver nanowires;
s02: adding 3-6 parts of graphene regulator and 1-3 parts of sodium dodecyl benzene sulfonate into 10-15 parts of Tris-HCl buffer solution, stirring for 5-10 min at a rotating speed of 800-1200 r/min, and obtaining a first modified liquid after stirring;
s03: adding 8-12 parts of pre-improved silver nanowires into 15-20 parts of dopamine solution, then adding 2-5 parts of ethylenediamine, and stirring fully to obtain a second modified solution;
s04: and mixing, stirring and reacting the second modified liquid and the first modified liquid according to a weight ratio of 3:1, wherein the stirring temperature is 48-50 ℃, the stirring rotating speed is 1000-1500 r/min, the stirring time is 25-30 min, and the graphene-modified silver nanowire is obtained after the stirring is finished, water washing and drying.
The pH value of the Tris-HCl buffer solution of the embodiment is 8-9; the mass fraction of the dopamine solution is 4-6%.
The preparation method of the graphene regulator in the embodiment comprises the following steps:
and (3) carrying out heat treatment on graphene at 300-350 ℃ for 5-10 min, cooling to 75-80 ℃ at a speed of 1-3 ℃/min, immersing into a barium nitrate aqueous solution with a mass fraction of 6-10%, stirring and cooling, cooling to room temperature, washing with water, and drying to obtain the graphene regulator.
The preparation method of the potassium titanate whisker modifier in the embodiment comprises the following steps:
s11: adding potassium titanate whisker into a potassium permanganate solution with the mass fraction of 5% according to the weight ratio of 1:5, uniformly dispersing, washing with water, drying, then sending the potassium titanate whisker into a kettle at the temperature of 210-220 ℃ for heat treatment for 5-10 min, and naturally cooling to room temperature;
s12: immersing the S11 product into yttrium nitrate solution with the mass fraction of 5%, performing ultrasonic dispersion for 10-20 min, and performing ultrasonic power of 350-400W, and performing ultrasonic finishing, washing and drying;
s13: adding the S12 product into a sodium alginate solution with the mass fraction of 8% according to the weight ratio of 1:6, then adding a phosphate buffer solution with the pH value of 5.5 and accounting for 2-5% of the total amount of the S12 product and sodium lignin sulfonate with the total amount of 4-8% of the total amount of the S12 product, stirring and reacting for 35-45 min at the rotating speed of 450-550 r/min, and washing and drying to obtain the potassium titanate whisker modifier.
The preparation method of the ionic liquid slurry in the embodiment comprises the following steps:
mixing and stirring 1-butyl-3-methylimidazole chloride aqueous solution and chitosan solution with the mass fraction of 5% uniformly according to the weight ratio of 1:3;
then adding lanthanum nitrate solution with the mass fraction of 6% and the total amount of 1-butyl-3-methylimidazole chloride of 2-5%, and silane coupling agent KH560 with the total amount of 1-3-methylimidazole chloride of 1-3%, and stirring and uniformly mixing to obtain liquid slurry.
The mass fraction of 1-butyl-3-methylimidazole chloride in the aqueous solution of 1-butyl-3-methylimidazole chloride of this example was 25 to 30%.
The preparation method of the conductive silver paste for the solar cell comprises the following steps:
step one: adding the graphene-modified silver nanowire, the potassium titanate whisker modifier and the ionic liquid slurry into a ball mill, ball milling at a speed of 1500-1700 r/min for 35-40 min, washing with water, and drying to prepare a pre-additive;
step two: and dispersing the glycidyl ether epoxy resin with the weight average molecular weight of 200-300, the pre-additive, the curing agent and the solvent at the speed of 500-600 r/min for 15-20 min, and obtaining the conductive silver paste for the solar cell.
Example 1.
The conductive silver paste for the solar cell comprises the following raw materials in parts by weight:
15 parts of glycidyl ether epoxy resin with weight average molecular weight of 200, 35 parts of graphene-modified silver nanowire, 8 parts of potassium titanate whisker modifier, 10 parts of ionic liquid slurry, 2 parts of curing agent and 15 parts of solvent.
The curing agent of this example is diamino diphenyl sulfone: the solvent is propylene glycol methyl ether acetate.
The preparation method of the graphene-modified silver nanowire comprises the following steps:
s01: adding 10 parts of silver nanowires into 25 parts of concentrated hydrochloric acid, uniformly stirring, washing with water, drying, transferring into 20 parts of sodium hydroxide solution with mass fraction of 5%, fully stirring, washing with water, and drying to obtain pre-improved silver nanowires;
s02: adding 3 parts of graphene regulator and 1 part of sodium dodecyl benzene sulfonate into 10 parts of Tris-HCl buffer solution, stirring at a rotating speed of 800r/min for 5min, and obtaining a first modified liquid after stirring;
s03: adding 8 parts of pre-improved silver nanowires into 15 parts of dopamine solution, then adding 2 parts of ethylenediamine, and stirring fully to obtain a second modified solution;
s04: and mixing, stirring and reacting the second modified liquid and the first modified liquid according to the weight ratio of 3:1, wherein the stirring temperature is 48 ℃, the stirring rotating speed is 1000r/min, the stirring time is 25min, and the graphene-regulated modified silver nanowire is obtained after the stirring is finished, water washing and drying.
The Tris-HCl buffer solution of this example had a pH of 8; the mass fraction of the dopamine solution is 4%.
The preparation method of the graphene regulator in the embodiment comprises the following steps:
and (3) carrying out heat treatment on graphene at 300 ℃ for 5min, cooling to 75 ℃ at a speed of 1 ℃/min, then immersing the graphene into a barium nitrate aqueous solution with a mass fraction of 6%, stirring and cooling, cooling to room temperature, washing with water, and drying to obtain the graphene regulator.
The preparation method of the potassium titanate whisker modifier in the embodiment comprises the following steps:
s11: adding potassium titanate whiskers into a potassium permanganate solution with the mass fraction of 5% according to the weight ratio of 1:5, uniformly dispersing, washing with water, drying, then sending the potassium titanate whiskers into a kettle for heat treatment at 210 ℃ for 5min, and naturally cooling to room temperature;
s12: immersing the S11 product into yttrium nitrate solution with the mass fraction of 5%, performing ultrasonic dispersion for 10min, wherein the ultrasonic power is 350W, and performing ultrasonic treatment, washing and drying;
s13: adding the S12 product into a sodium alginate solution with the mass fraction of 8% according to the weight ratio of 1:6, then adding a phosphate buffer solution with the pH value of 5.5 and accounting for 2% of the total amount of the S12 product and sodium lignin sulfonate with the total amount of 4% of the total amount of the S12 product, stirring and reacting for 35min at the rotating speed of 450r/min, and washing and drying to obtain the potassium titanate whisker modifier.
The preparation method of the ionic liquid slurry in the embodiment comprises the following steps:
mixing and stirring 1-butyl-3-methylimidazole chloride aqueous solution and chitosan solution with the mass fraction of 5% uniformly according to the weight ratio of 1:3;
then adding lanthanum nitrate solution with the mass fraction of 6% and the total amount of 2% of 1-butyl-3-methylimidazole chloride and silane coupling agent KH560 with the total amount of 1% of 1-butyl-3-methylimidazole chloride, and stirring and uniformly mixing to obtain liquid slurry.
The mass fraction of 1-butyl-3-methylimidazole chloride in the aqueous solution of 1-butyl-3-methylimidazole chloride of this example was 25%.
The preparation method of the conductive silver paste for the solar cell comprises the following steps:
step one: adding the graphene-modified silver nanowire, the potassium titanate whisker modifier and the ionic liquid slurry into a ball mill, ball milling for 35min at the speed of 1500r/min, washing with water, and drying to prepare a pre-additive;
step two: dispersing the glycidyl ether epoxy resin with the weight average molecular weight of 200, the pre-additive, the curing agent and the solvent at the speed of 500r/min for 15min, and obtaining the conductive silver paste for the solar cell.
Example 2.
The conductive silver paste for the solar cell comprises the following raw materials in parts by weight:
25 parts of glycidyl ether epoxy resin with weight average molecular weight of 300, 40 parts of graphene-modified silver nanowires, 12 parts of potassium titanate whisker modifier, 15 parts of ionic liquid slurry, 3 parts of curing agent and 20 parts of solvent.
The curing agent of this example is diamino diphenyl sulfone: the solvent is propylene glycol methyl ether acetate.
The preparation method of the graphene-modified silver nanowire comprises the following steps:
s01: adding 15 parts of silver nanowires into 30 parts of concentrated hydrochloric acid, uniformly stirring, washing with water, drying, transferring to 30 parts of sodium hydroxide solution with mass fraction of 5%, fully stirring, washing with water, and drying to obtain pre-improved silver nanowires;
s02: adding 6 parts of graphene regulator and 3 parts of sodium dodecyl benzene sulfonate into 15 parts of Tris-HCl buffer solution, stirring at a rotating speed of 1200r/min for 10min, and obtaining a first modified liquid after stirring;
s03: adding 12 parts of pre-improved silver nanowires into 20 parts of dopamine solution, then adding 5 parts of ethylenediamine, and stirring fully to obtain a second modified solution;
s04: and mixing, stirring and reacting the second modified liquid and the first modified liquid according to the weight ratio of 3:1, wherein the stirring temperature is 50 ℃, the stirring rotating speed is 1500r/min, the stirring time is 30min, and the graphene-regulated modified silver nanowire is obtained after water washing and drying after stirring.
The Tris-HCl buffer solution of this example had a pH of 9; the mass fraction of the dopamine solution is 6%.
The preparation method of the graphene regulator in the embodiment comprises the following steps:
and (3) carrying out heat treatment on graphene at 350 ℃ for 10min, cooling to 80 ℃ at a speed of 3 ℃/min, then immersing into a barium nitrate aqueous solution with a mass fraction of 10%, stirring and cooling, cooling to room temperature, washing with water, and drying to obtain the graphene regulator.
The preparation method of the potassium titanate whisker modifier in the embodiment comprises the following steps:
s11: adding potassium titanate whiskers into a potassium permanganate solution with the mass fraction of 5% according to the weight ratio of 1:5, uniformly dispersing, washing with water, drying, then sending the potassium titanate whiskers into a heat treatment device at 220 ℃ for 10min, and naturally cooling to room temperature;
s12: immersing the S11 product into yttrium nitrate solution with the mass fraction of 5%, performing ultrasonic dispersion for 20min, wherein the ultrasonic power is 400W, and performing ultrasonic treatment, washing and drying;
s13: adding the S12 product into a sodium alginate solution with the mass fraction of 8% according to the weight ratio of 1:6, then adding a phosphoric acid buffer solution with the pH value of 5.5 and the sodium lignin sulfonate with the total amount of 8% of the S12 product, which are 5% of the total amount of the S12 product, stirring and reacting for 45min at the rotating speed of 550r/min, and washing and drying to obtain the potassium titanate whisker modifier.
The preparation method of the ionic liquid slurry in the embodiment comprises the following steps:
mixing and stirring 1-butyl-3-methylimidazole chloride aqueous solution and chitosan solution with the mass fraction of 5% uniformly according to the weight ratio of 1:3;
then adding lanthanum nitrate solution with the mass fraction of 6% and the total amount of 5% of 1-butyl-3-methylimidazole chloride and silane coupling agent KH560 with the total amount of 3% of 1-butyl-3-methylimidazole chloride, and stirring and uniformly mixing to obtain liquid slurry.
The mass fraction of 1-butyl-3-methylimidazole chloride in the aqueous solution of 1-butyl-3-methylimidazole chloride of this example was 30%.
The preparation method of the conductive silver paste for the solar cell comprises the following steps:
step one: adding the graphene-modified silver nanowire, the potassium titanate whisker modifier and the ionic liquid slurry into a ball mill, ball milling at the speed of 1700r/min for 40min, washing with water, and drying to prepare a pre-additive;
step two: and dispersing the glycidyl ether epoxy resin with the weight average molecular weight of 300, the pre-additive, the curing agent and the solvent for 20min at the speed of 600r/min, and obtaining the conductive silver paste for the solar cell.
Example 3.
The conductive silver paste for the solar cell comprises the following raw materials in parts by weight:
20 parts of glycidyl ether epoxy resin with weight average molecular weight of 250, 37.5 parts of graphene-modified silver nanowire, 10 parts of potassium titanate whisker modifier, 12.5 parts of ionic liquid slurry, 2.5 parts of curing agent and 17.5 parts of solvent.
The curing agent of this example is diamino diphenyl sulfone: the solvent is propylene glycol methyl ether acetate.
The preparation method of the graphene-modified silver nanowire comprises the following steps:
s01: adding 12.5 parts of silver nanowires into 27.5 parts of concentrated hydrochloric acid, uniformly stirring, washing with water, drying, transferring into 25 parts of sodium hydroxide solution with mass fraction of 5%, stirring fully, washing with water, and drying to obtain pre-improved silver nanowires;
s02: adding 4.5 parts of graphene regulator and 2 parts of sodium dodecyl benzene sulfonate into 12.5 parts of Tris-HCl buffer solution, stirring at a rotating speed of 1000r/min for 7.5min, and obtaining a first modified liquid after stirring;
s03: adding 10 parts of pre-improved silver nanowires into 17.5 parts of dopamine solution, then adding 3.5 parts of ethylenediamine, and stirring fully to obtain a second modified solution;
s04: and mixing, stirring and reacting the second modified liquid and the first modified liquid according to the weight ratio of 3:1, wherein the stirring temperature is 49 ℃, the stirring rotating speed is 1250r/min, the stirring time is 27.5min, and the graphene-regulated modified silver nanowire is obtained after the stirring is finished, water washing and drying.
The pH of the Tris-HCl buffer solution of this example was 8.5; the mass fraction of the dopamine solution is 5%.
The preparation method of the graphene regulator in the embodiment comprises the following steps:
and (3) carrying out heat treatment on graphene at 325 ℃ for 7.5min, cooling to 78 ℃ at a speed of 2 ℃/min, then immersing into 8% barium nitrate aqueous solution, stirring and cooling, cooling to room temperature, washing with water, and drying to obtain the graphene regulator.
The preparation method of the potassium titanate whisker modifier in the embodiment comprises the following steps:
s11: adding potassium titanate whiskers into a potassium permanganate solution with the mass fraction of 5% according to the weight ratio of 1:5, uniformly dispersing, washing with water, drying, then sending the potassium titanate whiskers into the kettle to be subjected to heat treatment at 215 ℃ for 7.5min, and naturally cooling to room temperature;
s12: immersing the S11 product into yttrium nitrate solution with the mass fraction of 5%, performing ultrasonic dispersion for 15min, wherein the ultrasonic power is 370W, and performing ultrasonic treatment, washing and drying;
s13: adding the S12 product into a sodium alginate solution with the mass fraction of 8% according to the weight ratio of 1:6, then adding a phosphate buffer solution with the pH value of 5.5 and with the total amount of the S12 product of 3.5% and sodium lignin sulfonate with the total amount of 6% into the sodium alginate solution, stirring and reacting for 40min at the rotating speed of 500r/min, and washing and drying to obtain the potassium titanate whisker modifier after stirring.
The preparation method of the ionic liquid slurry in the embodiment comprises the following steps:
mixing and stirring 1-butyl-3-methylimidazole chloride aqueous solution and chitosan solution with the mass fraction of 5% uniformly according to the weight ratio of 1:3;
then adding a lanthanum nitrate solution with the mass fraction of 6% and the total amount of 3.5% of 1-butyl-3-methylimidazole chloride and a silane coupling agent KH560 with the total amount of 2% of 1-butyl-3-methylimidazole chloride, and stirring and uniformly mixing to obtain liquid slurry.
The mass fraction of 1-butyl-3-methylimidazole chloride in the aqueous solution of 1-butyl-3-methylimidazole chloride of this example was 27.5%.
The preparation method of the conductive silver paste for the solar cell comprises the following steps:
step one: adding the graphene-modified silver nanowire, the potassium titanate whisker modifier and the ionic liquid slurry into a ball mill, ball milling at a speed of 1600r/min for 38min, washing with water, and drying to prepare a pre-additive;
step two: and dispersing the glycidyl ether epoxy resin with the weight average molecular weight of 250, the pre-additive, the curing agent and the solvent at the speed of 550r/min for 17.5min, and obtaining the conductive silver paste for the solar cell.
Comparative example 1.
The difference from example 3 is that the graphene accommodation-modified silver nanowires are replaced with silver nanowires.
Comparative example 2.
The difference from example 3 is that the silver nanowires that were pre-improved in the preparation of graphene-modified silver nanowires were directly replaced with silver nanowires.
Comparative example 3.
The difference from example 3 is that the graphene modifier is replaced with graphene in the preparation of the graphene modified silver nanowire.
Comparative example 4.
In the preparation of the graphene conditioner, except for example 3, the process of immersing in 8% by mass barium nitrate aqueous solution and stirring and cooling was replaced with natural cooling to room temperature.
Comparative example 5.
Unlike example 3, the preparation method of the graphene accommodation-modified silver nanowire is different:
s01: adding 12.5 parts of silver nanowires into 27.5 parts of concentrated hydrochloric acid, uniformly stirring, washing with water, drying, transferring into 25 parts of sodium hydroxide solution with mass fraction of 5%, stirring fully, washing with water, and drying to obtain pre-improved silver nanowires;
s02: adding 4.5 parts of graphene regulator and 2 parts of sodium dodecyl benzene sulfonate into 12.5 parts of Tris-HCl buffer solution, adding 10 parts of pre-improved silver nanowires into the solution, then adding 3.5 parts of ethylenediamine into the solution, stirring at 49 ℃, at 1250r/min for 27.5min, washing with water, and drying to obtain graphene-modified silver nanowires; the pH of the Tris-HCl buffer solution was 8.5.
Comparative example 6.
Unlike example 3, the preparation method of the graphene accommodation-modified silver nanowire is different:
s01: adding 12.5 parts of silver nanowires into 27.5 parts of concentrated hydrochloric acid, uniformly stirring, washing with water, drying, transferring into 25 parts of sodium hydroxide solution with mass fraction of 5%, stirring fully, washing with water, and drying to obtain pre-improved silver nanowires;
s02: adding 10 parts of the pre-improved silver nanowire into 17.5 parts of dopamine solution, then adding 3.5 parts of ethylenediamine, 4.5 parts of graphene regulator and 2 parts of sodium dodecyl benzene sulfonate, stirring at 49 ℃ at 1250r/min for 27.5min, washing with water and drying to obtain graphene-regulated and modified silver nanowire; the mass fraction of the dopamine solution is 5%.
Comparative example 7.
Unlike example 3, the preparation method of the graphene accommodation-modified silver nanowire is different:
s01: adding 12.5 parts of silver nanowires into 27.5 parts of concentrated hydrochloric acid, uniformly stirring, washing with water, drying, transferring into 25 parts of sodium hydroxide solution with mass fraction of 5%, stirring fully, washing with water, and drying to obtain pre-improved silver nanowires;
s02: adding 4.5 parts of graphene regulator and 2 parts of sodium dodecyl benzene sulfonate into 12.5 parts of Tris-HCl buffer solution, adding 10 parts of pre-improved silver nanowires, 17.5 parts of dopamine solution and 3.5 parts of ethylenediamine, stirring at 49 ℃, at 1250r/min for 27.5min, washing with water, and drying to obtain graphene-modified silver nanowires.
Comparative example 8.
Unlike example 3, no potassium titanate whisker modifier was added.
Comparative example 9.
The difference from example 3 is that the S11 step was not employed in the preparation of the potassium titanate whisker modifier.
Comparative example 10.
The difference from example 3 is that the preparation of the potassium titanate whisker modifier does not employ the step S12.
Comparative example 11.
The difference from example 3 is that the S13 step was not employed in the preparation of the potassium titanate whisker modifier.
Comparative example 12.
Unlike example 3, no ionic liquid slurry was used.
Comparative example 13.
The difference from example 3 is that no aqueous solution of 1-butyl-3-methylimidazole chloride was added in the preparation of the ionic liquid slurry.
Comparative example 14.
The difference from example 3 is that no lanthanum nitrate solution was added in the preparation of the ionic liquid slurry.
The products of examples 1 to 3 and comparative examples 1 to 14 were subjected to performance tests for light transmittance (transmittance at 550nm in the visible light band measured by an ultraviolet-visible spectrophotometer), resistance (measured by a milliohm meter), and welding tension (measured by a tension meter), and the results were as follows;
as can be seen from comparative examples 1 to 14 and examples 1 to 3;
the product of the embodiment 3 has excellent light transmittance, excellent welding tension performance and coordinated improvement, in addition, the conductivity of the product is still excellent, and the product can realize integrated coordinated improvement;
from comparative examples 1 to 7 and example 3, the silver nanowire modified by graphene adjustment is replaced by silver nanowire, the conductivity, the light transmittance and the welding tension of the product all have obvious deterioration trend, meanwhile, the silver nanowire modified by graphene adjustment is directly replaced by silver nanowire in the preparation of the silver nanowire modified by graphene adjustment, the graphene modifier is replaced by graphene, the stirring and cooling treatment immersed in the barium nitrate aqueous solution with the mass fraction of 8% is replaced by natural cooling to room temperature, and the specific preparation methods of the silver nanowire modified by graphene adjustment are different, so that the performance of the product has the deterioration trend;
in particular, as shown in comparative examples 5 to 7, the second modified liquid and the first modified liquid have different raw materials, different preparation methods and different conditions of the mixing and stirring steps, and the performance effect of the product tends to be poor;
the graphene regulator prepared by adopting different methods is matched with the pre-improved silver nanowire, the second modified liquid and the first modified liquid for specific process treatment, the performance effect of the product is most obvious, and other methods are adopted to replace the product, so that the technical effect of the invention is not realized;
as shown in comparative examples 8-14 and example 3, the product has obvious deterioration trend in performance due to the fact that the potassium titanate whisker modifier is not added and the ionic liquid slurry is not adopted, the product has obvious deterioration trend in performance due to the fact that the potassium titanate whisker modifier and the graphene are adopted to regulate and modify the silver nanowire to cooperate with the ionic liquid slurry, the product has the most obvious performance effect, meanwhile, the ionic liquid slurry is prepared without adding the 1-butyl-3-methylimidazole chloride aqueous solution and the lanthanum nitrate solution, the product has deterioration trend in performance due to the fact that the ionic liquid slurry is prepared with the raw materials, the product has the most obvious performance effect due to the fact that the potassium titanate whisker modifier is not adopted in the preparation, the potassium titanate whisker modifier is not adopted in the step S11, the step S12 and the step S13, and the product has obvious deterioration trend in performance due to the fact that the specific step S11, the step S12 and the step S13 are adopted in combination.
From comparative examples 1, 8 and 12 and example 3, the graphene-modified silver nanowire is replaced by a silver nanowire, one of the potassium titanate whisker modifier and the ionic liquid slurry is not added, the performances of the product are obviously deteriorated, the three are coordinated and cooperated, the product has excellent light transmittance and excellent welding tension performance, the two can be coordinately improved, in addition, the conductivity of the product is still excellent, and the product can realize integrated coordinative improvement.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. The conductive silver paste for the solar cell is characterized by comprising the following raw materials in parts by weight:
15-25 parts of glycidyl ether epoxy resin with weight average molecular weight of 200-300, 35-40 parts of graphene-modified silver nanowires, 8-12 parts of potassium titanate whisker modifier, 10-15 parts of ionic liquid slurry, 2-3 parts of curing agent and 15-20 parts of solvent;
the preparation method of the graphene-modified silver nanowire comprises the following steps:
s01: adding 10-15 parts of silver nanowires into 25-30 parts of concentrated hydrochloric acid, uniformly stirring, washing with water, drying, transferring into 20-30 parts of sodium hydroxide solution with mass fraction of 5%, fully stirring, washing with water, and drying to obtain pre-improved silver nanowires;
s02: adding 3-6 parts of graphene regulator and 1-3 parts of sodium dodecyl benzene sulfonate into 10-15 parts of Tris-HCl buffer solution, stirring for 5-10 min at a rotating speed of 800-1200 r/min, and obtaining a first modified liquid after stirring;
s03: adding 8-12 parts of pre-improved silver nanowires into 15-20 parts of dopamine solution, then adding 2-5 parts of ethylenediamine, and stirring fully to obtain a second modified solution;
s04: mixing, stirring and reacting the second modified liquid and the first modified liquid according to a weight ratio of 3:1, wherein the stirring temperature is 48-50 ℃, the stirring rotation speed is 1000-1500 r/min, the stirring time is 25-30 min, and the graphene-modified silver nanowire is obtained after the stirring is finished, water-washed and dried;
the preparation method of the potassium titanate whisker modifier comprises the following steps:
s11: adding potassium titanate whisker into a potassium permanganate solution with the mass fraction of 5% according to the weight ratio of 1:5, uniformly dispersing, washing with water, drying, then sending the potassium titanate whisker into a kettle at the temperature of 210-220 ℃ for heat treatment for 5-10 min, and naturally cooling to room temperature;
s12: immersing the S11 product into yttrium nitrate solution with the mass fraction of 5%, performing ultrasonic dispersion for 10-20 min, and performing ultrasonic power of 350-400W, and performing ultrasonic finishing, washing and drying;
s13: adding an S12 product into a sodium alginate solution with the mass fraction of 8% according to the weight ratio of 1:6, then adding a phosphate buffer solution with the pH value of 5.5, accounting for 2-5% of the total amount of the S12 product and sodium lignin sulfonate with the total amount of 4-8% of the total amount of the S12 product, stirring and reacting for 35-45 min at the rotating speed of 450-550 r/min, and washing and drying to obtain a potassium titanate whisker modifier;
the preparation method of the ionic liquid slurry comprises the following steps:
mixing and stirring 1-butyl-3-methylimidazole chloride aqueous solution and chitosan solution with the mass fraction of 5% uniformly according to the weight ratio of 1:3;
then adding lanthanum nitrate solution with the mass fraction of 6% and the total amount of 1-butyl-3-methylimidazole chloride of 2-5%, and silane coupling agent KH560 with the total amount of 1-3-methylimidazole chloride of 1-3%, and stirring and uniformly mixing to obtain liquid slurry.
2. The conductive silver paste for a solar cell according to claim 1, wherein the conductive silver paste for a solar cell comprises the following raw materials in parts by weight:
20 parts of glycidyl ether epoxy resin with weight average molecular weight of 250, 37.5 parts of graphene-modified silver nanowire, 10 parts of potassium titanate whisker modifier, 12.5 parts of ionic liquid slurry, 2.5 parts of curing agent and 17.5 parts of solvent.
3. The conductive silver paste for a solar cell according to claim 1, wherein the curing agent is diaminodiphenyl sulfone; the solvent is propylene glycol methyl ether acetate.
4. The conductive silver paste for a solar cell according to claim 1, wherein the Tris-HCl buffer solution has a pH of 8 to 9; the mass fraction of the dopamine solution is 4-6%.
5. The conductive silver paste for a solar cell according to claim 1, wherein the preparation method of the graphene conditioner comprises the following steps:
and (3) carrying out heat treatment on graphene at 300-350 ℃ for 5-10 min, cooling to 75-80 ℃ at a speed of 1-3 ℃/min, immersing into a barium nitrate aqueous solution with a mass fraction of 6-10%, stirring and cooling, cooling to room temperature, washing with water, and drying to obtain the graphene regulator.
6. The conductive silver paste for solar cells according to claim 1, wherein the mass fraction of 1-butyl-3-methylimidazole chloride in the aqueous solution of 1-butyl-3-methylimidazole chloride is 25 to 30%.
7. A method for preparing the conductive silver paste for solar cells according to any one of claims 1 to 6, comprising the steps of:
step one: adding the graphene-modified silver nanowire, the potassium titanate whisker modifier and the ionic liquid slurry into a ball mill, ball milling at a speed of 1500-1700 r/min for 35-40 min, washing with water, and drying to prepare a pre-additive;
step two: dispersing the glycidyl ether epoxy resin with the weight average molecular weight of 200-300, the pre-additive, the curing agent and the solvent at the speed of 500-600 r/min for 15-20 min, and obtaining the conductive silver paste for the solar cell after the dispersion is finished.
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| CN104157332A (en) * | 2014-08-29 | 2014-11-19 | 天津市职业大学 | Silicon solar cell front face electrode lead-free silver paste and preparing method thereof |
| CN107945910A (en) * | 2017-11-27 | 2018-04-20 | 钦州学院 | The front electrode of solar battery silver paste and preparation method of silver-doped coated graphite alkene |
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| CN104157332A (en) * | 2014-08-29 | 2014-11-19 | 天津市职业大学 | Silicon solar cell front face electrode lead-free silver paste and preparing method thereof |
| CN107945910A (en) * | 2017-11-27 | 2018-04-20 | 钦州学院 | The front electrode of solar battery silver paste and preparation method of silver-doped coated graphite alkene |
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Inventor after: Zuo Chendong Inventor after: He Hui Inventor after: Cai Minmin Inventor after: Li Jingzhang Inventor after: Peng Wencai Inventor before: Zuo Chendong Inventor before: Li Jingzhang Inventor before: Peng Wencai |