CN101304049A - Paste for electrode forming of solar cell - Google Patents
Paste for electrode forming of solar cell Download PDFInfo
- Publication number
- CN101304049A CN101304049A CNA2008100964251A CN200810096425A CN101304049A CN 101304049 A CN101304049 A CN 101304049A CN A2008100964251 A CNA2008100964251 A CN A2008100964251A CN 200810096425 A CN200810096425 A CN 200810096425A CN 101304049 A CN101304049 A CN 101304049A
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- China
- Prior art keywords
- solar cell
- electrode
- weight portions
- slurry
- aluminium powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000843 powder Substances 0.000 claims abstract description 41
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 37
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000011521 glass Substances 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims description 49
- 239000004411 aluminium Substances 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 27
- 238000010304 firing Methods 0.000 claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 14
- 239000000428 dust Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 239000000020 Nitrocellulose Substances 0.000 claims description 6
- 229920001220 nitrocellulos Polymers 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 239000003381 stabilizer Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000003795 chemical substances by application Substances 0.000 abstract 4
- 238000004513 sizing Methods 0.000 abstract 4
- 230000000052 comparative effect Effects 0.000 description 8
- 238000007639 printing Methods 0.000 description 7
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 description 6
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 230000004523 agglutinating effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000001856 Ethyl cellulose Substances 0.000 description 3
- 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 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- -1 boro silicate Chemical compound 0.000 description 3
- 229920001249 ethyl cellulose Polymers 0.000 description 3
- 235000019325 ethyl cellulose Nutrition 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 2
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 2
- 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
- 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
- 206010000496 acne Diseases 0.000 description 2
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 description 2
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 description 2
- 239000011267 electrode slurry Substances 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 229940116411 terpineol Drugs 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
- QCAHUFWKIQLBNB-UHFFFAOYSA-N 3-(3-methoxypropoxy)propan-1-ol Chemical compound COCCCOCCCO QCAHUFWKIQLBNB-UHFFFAOYSA-N 0.000 description 1
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000005355 lead glass Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000320 mechanical mixture Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Inorganic Chemistry (AREA)
- Photovoltaic Devices (AREA)
- Conductive Materials (AREA)
Abstract
The invention provides a sizing agent for forming an electrode of a solar cell. The sizing agent has the following advantages that: the mechanical strength of the electrode and the closing performance with the base material are good, the back surface field (BSF) effect required by the solar cell can be accomplished thoroughly, the bend of the base material after burned can be restrained, the efficiency of the solar cell can be improved, and the sizing agent is more particularly suitable for burning at high temperature/ high speed with excellent mass production. The sizing agent for forming an electrode of a solar cell is characterized in that a) 60-75 parts by weight of aluminum power with at least 1.28 g/cc of tap density, b) 1-5 parts by weight of glass powder, and c) 20-38 parts by weight of organic carrier are included.
Description
Technical field
The electrode that the present invention relates to solar cell forms uses slurry, the electrode that particularly relates to the solar cell with following advantage forms with slurry and the electrode formation method of having utilized the solar cell of this slurry: its mechanical strength of electrodes and aspect the adaptation of base material excellence, and can fully reach the desired back surface field (BSF of solar cell, back surface field) effect, can suppress to fire the buckling phenomenon of back base material, the efficient of solar cell be can improve, high temperature/rapid firing, production excellence particularly are suitable for.
Background technology
Recently, solar cell is because multiple reason such as it is nuisanceless, the simplicity of equipment, durability are improved and being popularized rapidly, for this reason, various researchs have been carried out for the manufacture method of the solar cell of the efficient that can improve solar cell, production excellence.
The electrode of silicon solar cell in the past is following formation: the slurry that will contain conductive metal powder, glass dust and organic carrier is printed on the silicon substrate, carries out drying and fires, and forms electrode thus.Particularly, the back electrode of silicon solar cell uses the aluminium powder of 3～10 μ m usually.
In addition, fire and comprise low-firing (500～750 ℃) and high-temperature firing (800～950 ℃), owing to reduce producing cost and production comes into one's own gradually, therefore the importance of carrying out the high-temperature firing that the short time fires with high temperature further strengthens.
But, employed back side slurry carried out the short time when firing during the electrode of existing silicon solar cell formed under high temperature (800～950 ℃), had mechanical strength and descend, fire the back base material with the adaptation of base material to produce buckling phenomenon, BSF comes off when forming electrode layer thinly problem.
Summary of the invention
In order to solve above-mentioned the problems of the prior art, the object of the present invention is to provide the electrode of solar cell to form and utilized the electrode formation method of solar cell of this slurry and the electrode of the solar cell by described method manufacturing with slurry with following advantage, described advantage is: mechanical strength of electrodes and aspect the adaptation of base material excellence, even and under the situation that forms electrode layer thinly, also can fully reach the desired back surface field effect of solar cell, can suppress to fire the buckling phenomenon of back base material, can improve the efficient of solar cell, particularly be suitable for high temperature/rapid firing, the production excellence.
In order to reach above-mentioned purpose, the electrode that the invention provides a kind of solar cell forms uses slurry, and this slurry is characterised in that it contains: a) tap density of 60～75 weight portions (Tap density) is at least the above aluminium powder of 1.28g/cc; B) glass dust of 1～5 weight portion (glass frit); And c) organic carrier of 20～38 weight portions.
The tap density that the electrode of preferred solar cell of the present invention forms with aluminium powder described in the slurry is 1.30～3.50g/cc.
In addition, the invention provides the electrode formation method of solar cell, the method is characterized in that, the electrode of above-mentioned solar cell is formed be printed on the base material, and carry out drying and fire with slurry.
Preferred described firing at 850～950 ℃ carried out 5 seconds～1 minute.
The present invention also provides the electrode that utilizes the solar cell that described method produces.
The electrode formation method that the electrode of solar cell of the present invention forms with slurry and solar cell has following advantage: its mechanical strength of electrodes and aspect the adaptation of base material excellence, even and under the situation that forms electrode layer thinly, also can fully reach the desired back surface field of solar cell (BSF) effect, can suppress to fire the buckling phenomenon of back base material, the efficient of solar cell be can improve, high temperature/rapid firing, production excellence particularly are suitable for.
Embodiment
Below describe the present invention in detail.
Slurry of the present invention is characterised in that it contains: a) tap density of 60～75 weight portions is at least the above aluminium powder of 1.28g/cc; B) glass dust of 1～5 weight portion; And c) organic carrier of 20～38 weight portions.
Tap density of the present invention (packed density) is the following value that records: utilize the powder test instrument that aluminium powder is filled into volume and be 100cc (cm
3) measuring bottle in, carry out removing measuring bottle after 2000 jolt ramming, then sample accurately is filled to 100cc and measures powder quality (g), divided by 100, the value of gained is described tap density with powder quality (g).
If the tap density of described a) middle aluminium powder is not enough 1.28g/cc, then there are the following problems: can not fully reach back surface field (BSF) effect, can not suppress to fire the buckling phenomenon of back base material, carry out the agglutinating property of short time when firing and reduce under high temperature (800～950 ℃), the efficient of solar cell reduces.
The tap density that the electrode of preferred solar cell of the present invention forms with aluminium powder described in the slurry is 1.30～3.50g/cc, more preferably 1.30～2.0g/cc.The tap density of described aluminium powder can improve activity coefficient (the curve factor) value in above-mentioned scope the time, further improves the efficient of solar cell.
Be at least aluminium powder more than the 1.28g/cc for described tap density, can be by with i) particle mean size of 40～75 weight portions be the spherical aluminium powder of 1.0～2.8 μ m with the ii) particle mean size of 25～60 weight portions is that the spherical aluminium powder of 3.0～7.0 μ m mixes and makes.Preferably with i) particle mean size of 50～70 weight portions be the spherical aluminium powder of 1.5～2.7 μ m with the ii) particle mean size of 30～50 weight portions is that the spherical aluminium powder of 4.0～6.0 μ m mixes.The advantage that agglutinating property excellence when have high temperature/rapid firing this moment, the activity coefficient value of solar cell are further enhanced, the efficient of solar cell is improved.
Described aluminium powder can be 60～75 weight portions in the electrode formation of solar cell of the present invention with the content in the slurry.Preferred its content is 65～70 weight portions.The content of aluminium powder is in above-mentioned scope the time, the agglutinating property in the time of can improving high temperature/rapid firing and the activity coefficient value of solar cell.
In addition, the electrode of solar cell of the present invention forms with containing b in the slurry) glass dust.Described glass dust can use usually glass dust used in solar battery electrode slurry, and for example can use softening point is 400～600 ℃ borosilicic acid (boro silicate) lead glass, lead silicate glass, bismuth glass or lithium system etc.Can use particle diameter is the glass dust of 1～10 μ m.The preferred Bi that uses
2O
3-ZnO-SiO
2-B
2O
3-Al
2O
3Glass frit.In this case, even form the thin electrodes of 15～25 μ m, also can prevent the buckling phenomenon of base material.
And, in forming with slurry, the electrode of solar cell of the present invention can contain the described glass dust of 1～5 weight portion, further preferably contain the described glass dust of 1.5～3 weight portions.Described content is in this scope the time, has cohesive force, agglutinating property and is easy to carry out the advantage of the back manufacturing procedure of solar cell.
In addition, the electrode of solar cell of the present invention forms and contains c with slurry) organic carrier.Described organic carrier carries out viscosity (consistency) and the rheology characteristic that mechanical mixture has slurry to be suitable for printing by forming with the inorganic constituents of slurry with the electrode of solar cell.Described organic carrier can use common organic carrier used in the electrode slurry of solar cell, for example can be the mixture of polymer and solvent.As described polymer, can use the polymer, wood rosin (rosin) of acrylic ester resin, ethyl cellulose, nitrocellulose, ethyl cellulose and phenolic resins or the polymethacrylates of alcohol etc.Preferred nitrocellulose.In addition, as described solvent, acetate of butyl carbitol, butyl carbitol, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether propionic ester, ether propionate ester, terpineol (terpineol), propylene glycol methyl ether acetate, dimethylamino formaldehyde, butanone, gamma-butyrolacton or ethyl lactate etc. can be used separately or mix more than 2 kinds and use.The preferred acetate of butyl carbitol that uses.
Among the present invention, described carrier forms with the content in the slurry at the electrode of solar cell of the present invention can be 20～38 weight portions, and can use polymer and solvent with 1～10: 10～1 weight ratio is mixed the carrier of back gained.
In addition, the electrode of solar cell of the present invention forms and can further contain the additive that is generally comprised within the slurry as required with slurry.Example as described additive, can enumerate sintering aid, tackifier, stabilizer, dispersant or surfactant etc., electrode at solar cell of the present invention forms with in the slurry, and described additive can use in the scope of 0.1～10 weight portion.
The electrode formation of solar cell of the present invention can mix with certain ratio with optional member by the necessary composition with above-mentioned record with slurry and utilize the mixing roll of mixer or three rollers etc. that it is evenly disperseed to obtain.Form with slurry for the electrode of solar cell of the present invention, preferably flying (Brookfield) HBT viscosimeter by rich power and be 50～200PaS with the multipurpose cup that uses the #51 rotor its viscosity when 5rpm and 25 ℃ are measured.
In addition, the invention provides the electrode formation method of solar cell and the electrode of solar battery of making by described method, described method is characterised in that, the electrode formation of described solar cell is printed on the base material with slurry, and carries out drying and fire.In the electrode of solar battery formation method of the present invention, except that the electrode that uses described solar cell forms with the slurry, base material, printing, drying and firing can use certainly common in the manufacturing of solar cell employed method.For example described base material can be for being printed with preceding electrode (Ag electrode) and having carried out dry Si substrate, described electrode among the present invention can be the back electrode of silicon solar cell, described printing can be silk screen printing, described drying can be carried out at 90～250 ℃, and described firing can be carried out at 600～950 ℃.Preferred described firing is set at the high temperature/rapid firing that carried out at 800～950 ℃ (further preferably at 850～900 ℃) 5 seconds～1 minute, and the thickness that described printing is set at 20～60 μ m prints.As concrete example, can open 2001-202822 and specially open the structure of the solar cell of putting down in writing among the 2003-133567 and make in Republic of Korea's openly specially permit communique 10-2006-0108550 number, 10-2006-0127813 number, day disclosure special permission communique spy, use the electrode of solar cell of the present invention to form the electrode that forms solar cell with slurry.
The electrode formation method of solar cell of the present invention has following advantage: its mechanical strength of electrodes and aspect the adaptation of base material excellence, even and under the situation that forms electrode layer thinly, also can fully reach the desired back surface field of solar cell (BSF) effect, can suppress to fire the buckling phenomenon of back base material, the efficient of solar cell be can improve, high temperature/rapid firing, production excellence particularly are suitable for.
Preferred embodiment is shown in order to understand the present invention below, yet following embodiment is used for example the present invention, scope of the present invention is not limited to following embodiment.
[embodiment]
Embodiment 1
Spherical aluminium powder and the average grain diameter of 33.3 weight portions that with the average grain diameter of 66.7 weight portions is 2.68 μ m is that the spherical aluminium powder of 5.28 μ m evenly mixes, and the electrode of solar battery of making tap density and be 1.35g/cc forms uses aluminium powder.With the described tap density of 67.5 weight portions is that aluminium powder, the 3.0 weight portion particle diameters of 1.35g/cc are that 3.36 μ m and softening point are that 466 ℃ low melting point glass dust, 27.7 weight portion organic carriers (its ethyl cellulose is mixed with 72: 72: 131 weight ratio with acetate of butyl carbitol with nitrocellulose obtain), 1.5 weight portion tackifier, 0.5 weight portion surfactant utilizes three roller mixing roll mixing dispersions, and the electrode of making solar cell forms uses slurry.
Embodiment 2
In described embodiment 1, using 50 weight portion average grain diameters is that spherical aluminium powder and the 50 weight portion average grain diameters of 2.68 μ m are that the spherical aluminium powder of 5.28 μ m mixes the tap density that the obtains aluminium powder as 1.43g/cc, in addition, adopt the electrode of making solar cell with the same method of described embodiment 1 to form and use slurry.
Embodiment 3
In described embodiment 1, using 74.6 weight portion average grain diameters is that spherical aluminium powder and the 25.4 weight portion average grain diameters of 2.68 μ m are that the spherical aluminium powder of 5.28 μ m mixes the tap density that the obtains aluminium powder as 1.29g/cc, in addition, adopt the electrode of making solar cell with the same method of described embodiment 1 to form and use slurry.
Embodiment 4
In described embodiment 1, use mixes with nitrocellulose acetate of butyl carbitol and the organic carrier that obtains with 131: 144 weight ratio, in addition, adopt the electrode of making solar cell with the same method of described embodiment 1 to form and use slurry.
Embodiment 5
In described embodiment 2, use mixes with nitrocellulose acetate of butyl carbitol and the organic carrier that obtains with 131: 144 weight ratio, in addition, adopt the electrode of making solar cell with the same method of described embodiment 2 to form and use slurry.
Comparative example 1
In described embodiment 1, using 67.5 weight portion average grain diameters is 5.28 μ m, the tap density spherical aluminium powder as 1.24g/cc, in addition, adopts the electrode of making solar cell with the same method of described embodiment 1 to form and uses slurry.
Comparative example 2
In described embodiment 1, using 67.5 weight portion average grain diameters is 2.68 μ m, the tap density spherical aluminium powder as 1.19g/cc, in addition, adopts the electrode of making solar cell with the same method of described embodiment 1 to form and uses slurry.
The electrode that has utilized the solar cell of making in described embodiment 1～5 and the comparative example 1～2 is formed the surface state with the electrode of slurry, down curved (low bow, mm), Isc (short circuit current, A), Voc (open circuit voltage, mV), the efficient of activity coefficient and solar cell measures, and the results are shown in following table 1.
Experimental technique is as follows.
Utilize method for printing screen to be printed on the back of wafer (Wafer) in the slurry of making in the foregoing description 1～5 and the comparative example 1～3 comprehensively, use the hot air type drying oven 150 ℃ of dryings 6 minutes.Then, silver (Ag) slurry is printed on the front of wafer by pattern printing (Pattern printing) method, then uses the same method and carry out drying.To utilize the belt baking furnace between 500～900 ℃, to carry out 20 seconds～30 seconds firing by the battery (Cell) that above-mentioned operation forms, (EndeasI society, Quicksun120A) following curved (mm), Isc (A), Voc (mV), activity coefficient, efficient (%) performance of the battery that manufacturing like this is finished are observed to use the solar battery efficiency determinator.In addition, utilize the spot and the degree of roughness of perusal battery surface, the situation that spot is not observed on the surface is designated as " well ", and spotted situation is designated as " spottiness ", the surface has the situation of coarse part to be designated as " coarse ", and the surface does not have the situation of coarse part to be designated as " well ".
Table 1
| Pimple | Rough surface | Down curved (mm) | Isc (A) | Voc (mV) | Activity coefficient | Efficient (%) | |
| Embodiment 1 | Well | Well | ＜1 | 5.16 | 610.3 | 0.78 | 16.42 |
| Embodiment 2 | Well | Well | ＜1 | 5.19 | 611.5 | 0.76 | 16.20 |
| Embodiment 3 | Well | Well | ＜1 | 5.16 | 610.2 | 0.75 | 16.02 |
| Embodiment 4 | Well | Well | ＜1 | 5.17 | 610.8 | 0.78 | 16.50 |
| Embodiment 5 | Well | Well | ＜1 | 5.19 | 611.6 | 0.77 | 16.65 |
| Comparative example 1 | Spottiness | Well | ＜1 | 5.13 | 607.1 | 0.71 | 15.24 |
| Comparative example 2 | Well | Coarse | ＜1 | 5.11 | 607.6 | 0.73 | 15.72 |
Shown in above-mentioned table 1, compare with the comparative example 1 of the aluminium powder of the not enough 1.25g/cc of normally used tap density and the situation of comparative example 2 in the solar cell that uses in the past, in embodiments of the invention 1～5, almost there be not pimple, the rough surface of generating electrodes, all right; The efficient of Isc (A), Voc (mV), activity coefficient and solar cell all shows the result of remarkable excellence, is particularly using under the nitrocellulosic situation (embodiment 4～5) can confirm that it is more effective.
Claims (9)
1. the electrode of a solar cell forms and uses slurry, it is characterized in that this slurry contains:
A) tap density of 60 weight portions～75 weight portions is at least the above aluminium powder of 1.28g/cc;
B) glass dust of 1 weight portion～5 weight portions; And
C) organic carrier of 20 weight portions～38 weight portions.
2. the electrode of solar cell as claimed in claim 1 forms and uses slurry, it is characterized in that the tap density of described aluminium powder is 1.30g/cc～3.50g/cc.
3. the electrode of solar cell as claimed in claim 1 forms and uses slurry, it is characterized in that described aluminium powder mixes following substances:
I) particle mean size of 40 weight portions～75 weight portions is the spherical aluminium powder of 1.0 μ m～2.8 μ m; And
Ii) the particle mean size of 25 weight portions～60 weight portions is the spherical aluminium powder of 3.0 μ m～7.0 μ m.
4. the electrode of solar cell as claimed in claim 1 forms and uses slurry, it is characterized in that described aluminium powder mixes following substances:
I) particle mean size of 50 weight portions～70 weight portions is the spherical aluminium powder of 1.5 μ m～2.7 μ m; And
Ii) the particle mean size of 30 weight portions～50 weight portions is the spherical aluminium powder of 4.0 μ m～6.0 μ m.
5. the electrode of solar cell as claimed in claim 1 forms and uses slurry, it is characterized in that described organic carrier contains nitrocellulose and solvent.
6. the electrode of solar cell as claimed in claim 1 forms and uses slurry, it is characterized in that described slurry also contains sintering aid, tackifier, stabilizer or dispersant.
7. the electrode formation method of a solar cell is characterized in that, in the method, any described slurry of claim 1～6 is printed on the base material, and carries out drying and fire.
8. the electrode formation method of solar cell as claimed in claim 7 is characterized in that, described firing at 850 ℃～950 ℃ carried out 5 seconds～1 minute.
9. the electrode of a solar cell, this electrode adopt the described formation method of claim 7 to form on solar battery base.
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| KR1020070044911A KR101352786B1 (en) | 2007-05-09 | 2007-05-09 | Paste for producing electrode of solar cell |
| KR10-2007-0044911 | 2007-05-09 |
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| KR (1) | KR101352786B1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW200903813A (en) | 2009-01-16 |
| KR20080099407A (en) | 2008-11-13 |
| TWI455328B (en) | 2014-10-01 |
| KR101352786B1 (en) | 2014-01-15 |
| CN101304049B (en) | 2011-12-21 |
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