CN108623145A - Carry on the back annealing point contact solar cell aluminium paste lead-free glass powder and preparation method thereof - Google Patents
Carry on the back annealing point contact solar cell aluminium paste lead-free glass powder and preparation method thereof Download PDFInfo
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- CN108623145A CN108623145A CN201810648514.6A CN201810648514A CN108623145A CN 108623145 A CN108623145 A CN 108623145A CN 201810648514 A CN201810648514 A CN 201810648514A CN 108623145 A CN108623145 A CN 108623145A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/066—Glass compositions containing silica with less than 40% silica by weight containing boron containing zinc
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C12/00—Powdered glass; Bead compositions
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Abstract
The invention discloses a kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powders and preparation method thereof, including following weight percent composition：ZnO20~50%, V2O55~25%, B2O313~30%, Al2O310~25%, SiO21~5%, CaO1~5%, Bi2Se31~10% and MoTe21~10%.Each component is stirred to rotation 1h mixing in batch mixer；Mixture is placed in 30~60min of melting in the resistance furnace that temperature is 1100~1250 DEG C, nitrogen is passed through and keeps the temperature 30~60min；The melten glass melted is rolled into thin slice；After thin slice is crushed to 1~3um of granularity, air current classifying screening is carried out to glass powder, it is 1.5~2.5um to obtain median, and softening temperature is 480~510 DEG C of lead-free glass powders.Glass powder of the present invention is free of lead oxide, and softening point is low, can aluminium electrode be formed good ohmic with silicon substrate and contacted, solar cell transformation efficiency obtained is high.
Description
Technical field
The invention belongs to chemical technology fields, and in particular to a kind of unleaded glass of back of the body annealing point contact solar cell aluminium paste
Glass powder also relates to the preparation method of the back of the body annealing point contact solar cell aluminium paste lead-free glass powder.
Background technology
The efficiency of common crystal silicon solar cell is usually less than 20%, currently, in order to improve the conversion of solar cell
Efficiency and reduction crystalline silicon cost, carry on the back annealing point contact solar cell（Passivated Emitter and Rear Cell,
Abbreviation PERC）Because its efficiency is higher than 20%, it is increasingly becoming the hot spot of solar cell research.It is different from the common crystal silicon sun
Energy battery, the key of PERC batteries are to carry on the back passivation and point contact, i.e., are coated with one layer of passivating film on the cell silicon chip back side, carry on the back
Electrode uses point contact form, and passivating film is usually insulator.In order to which electric current is exported battery, when preparing PERC batteries, usually
The hole that passivating film is outputed to about 40 microns of sizes of some diameters with laser, then pours into special aluminium paste in hole, aluminium paste
It is only contacted with silicon base at perforation, forms aluminum back electrode after high temperature sintering.Due to contact surface very little, therefore referred to as point contact.This
Sample had both maintained back side field-effect, so that aluminium and the high recombination rate region of silicon wafer body interface is greatly reduced, while the incidence at the back side
Light can be by back electrode extracted current, to realize that two-sided photoelectric converting function, battery efficiency are improved.
Conventional crystalline silicon aluminium paste used for solar batteries, under local contact conditions when high temperature sintering, silicon is soluble in aluminium so that aluminium
With silicon substrate contact interface formed cavity and it is breaking, increase the local contact resistance of aluminium silicon, the aluminium electrode poorly conductive of formation.
The technology of novel battery piece proposes aluminium paste new requirement, needs to add some other substances in aluminium paste to enhance the close of aluminium silicon
Contact has satisfactory electrical conductivity aluminum back electrode to be formed.Glass powder is to be presently used in the most frequently used additive in PERC aluminium pastes,
In aluminium paste sintering process, fusing is corroded aluminium powder surface oxide layer by glass powder, keeps alumina particles conductive；Simultaneously glass powder with
Alumina particles are closely contacted with each other, and form alusil alloy to make aluminum back electrode have good electric conductivity.Therefore, glass powder group
Point, the variation of content and preparation method be to directly affect aluminium paste to have an important factor for good ohmic contact with silicon chip, be
Influence one of the efficiency key link of PERC crystal silicon batteries.Glass powder for aluminium paste common are PbO~ZnO~B2O3 systems,
PbO~B2O3~SiO2 systems, PbO~Bi2O3~B2O3 systems etc..These glass powders usually contain to pursue low softening point
Environmentally harmful Pb elements, this element is unfavorable to environment, can cause greatly to injure to human body.
Chinese patent CN107673623A discloses a kind of two-sided PERC aluminium pastes glass powder and preparation method thereof, contains in height
In lead glass powder, the spiral shape reticular structure that lead oxide is formed with silica enables frit to destroy aluminium film and silicon substrate, promotees
Into alusil alloy formation and the compactness of aluminium layer, there is good electric conductivity, but the glass powder component still contains up to 20~50%
Lead oxide is not suitable with environmental requirement.
In view of any of the above situation, provide it is a kind of being free of lead oxide, softening point is low, can form with silicon substrate aluminium electrode good
Good Ohmic contact is this field skill for carrying on the back the lead-free glass powder and preparation method thereof of annealing point contact solar cell aluminium paste
Art personnel technical barrier urgently to be resolved hurrily.
Invention content
One kind is provided and is free of lead oxide it is an object of the invention to overcome disadvantages mentioned above, softening point is low, can be by aluminium electrode
The back of the body annealing point contact solar cell aluminium paste lead-free glass powder that good ohmic contacts is formed with silicon substrate.
A kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powder of the present invention, including following weight percent
Component：ZnO20~50%, V2O55~25%, B2O313~30%, Al2O310~25%, SiO21~5%, CaO1~5%, Bi2Se31~
10% and MoTe21~10%.
A kind of above-mentioned back of the body annealing point contact solar cell aluminium paste lead-free glass powder, preferably Bi2Se3Weight content is 2
~5%.
A kind of above-mentioned back of the body annealing point contact solar cell aluminium paste lead-free glass powder, preferably MoTe2Weight content is 5
~8%.
A kind of above-mentioned back of the body annealing point contact solar cell aluminium paste lead-free glass powder, the wherein median of glass powder
For 1.5~2.5um, softening temperature is 480~510 DEG C.
A kind of back of the body annealing point contact solar cell aluminium paste crown glass powder, preparation method thereof of the present invention, including following step
Suddenly：
(1) each raw material is weighed by above-mentioned weight percent, the stirring rotation 1h mixing in batch mixer；
(2) it is 30~60min of melting in 1100~1250 DEG C of resistance furnace mixture to be placed in temperature, be passed through nitrogen heat preservation 30~
60min；
(3) melten glass melted is rolled into thin slice；
(4) after thin slice being crushed to 1~3um of granularity, to glass powder carry out air current classifying screen out median be 1.5~
2.5um is certified products.
Compared with prior art, the present invention there is apparent advantageous effect, as can be known from the above technical solutions：The glass of the present invention
Glass powder introduces ZnO, V2O5、B2O3System is arranged in pairs or groups, and frit is made to be formed with special network structure and with very wide glassy state
Area has height fluxibility, plays the role of substituting PbO；It can obviously reduce the softening point of glass after addition ZnO；B is added2O3Have
Help the formation of glass network structure, wellability of the glass to silicon chip when rush；Bi is added2Se3Component can promote vitreum to corrode
The oxide layer on aluminium powder surface in aluminium paste makes aluminium electrode obtain good electrical property；MoTe is added2It can promote glass powder System forming
Special network structure promotes the mutual tight bond of alumina particles, when aluminium paste is sintered, aluminium electrode is formed with silicon substrate good
Ohmic contact.The glass powder of the present invention is free of lead oxide, and softening point is low, can melt, corrode aluminium powder surface oxide layer, alumina particles it
Between tight bond, so that aluminium electrode is obtained good electrical property, while aluminium electrode and silicon substrate are formed good Ohmic contact, profit
In raising electricity conversion.Good with caking property, sintering temperature is low, can be suitable for back of the body annealing point contact solar cell aluminium
Slurry, belongs to unleaded green product, non-hazardous to operator and environment, substitutes existing containing lead glass frit.
Specific implementation mode
Embodiment 1
A kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powder, include the following steps：
(1) mass percent ZnO20%, V is weighed2O525%、B2O330%、Al2O310%、SiO21%、CaO2%、Bi2Se35% He
MoTe28% each raw material, the stirring rotation 1h mixing in batch mixer；
(2) mixture is placed in melting in high temperature resistance furnace, smelting temperature is 1250 DEG C, smelting time 30min；It is passed through nitrogen
Keep the temperature 30min；
(3) melten glass melted is rolled into thin slice；
(4) after thin slice being crushed to 1~3um of granularity, to glass powder carry out air current classifying screening median be 1.5~
2.5um to obtain the final product.
Application test：The median that glass powder is made in the present embodiment is 1.8~2.3um, and softening temperature is 480~490
℃.This glass powder is added to aluminium paste by mass content 5% to be uniformly mixed, this aluminium paste is then poured into the PERC cell silicon chips back side
In laser opening hole, aluminum back electrode is formed after high temperature sintering, bonds close bubble-free with silicon chip, the transformation efficiency for testing battery is
21.1%。
Embodiment 2
A kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powder, includes the following steps：
(1) mass percent ZnO40%, V is weighed2O55%、B2O313%、Al2O325%、SiO25%、CaO5%、Bi2Se32% He
MoTe25% each raw material, the stirring rotation 1h mixing in batch mixer；
(2) mixture is placed in melting in high temperature resistance furnace, smelting temperature is 1100 DEG C, smelting time 60min；It is passed through nitrogen
Keep the temperature 60min；
(3) melten glass melted is rolled into thin slice；
(4) after thin slice being crushed to 1~3um of granularity, to glass powder carry out air current classifying screening median be 1.5~
2.5um to obtain the final product.
Application test：The median that glass powder is made in the present embodiment is 1.5~2.0um, and softening temperature is 490~510
℃.This glass powder is added to aluminium paste by mass content 4% to be uniformly mixed, this aluminium paste is then poured into the PERC cell silicon chips back side
In laser opening hole, aluminum back electrode is formed after high temperature sintering, bonds close bubble-free with silicon chip, the transformation efficiency for testing battery is
22.0%。
Embodiment 3
A kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powder, includes the following steps：
(1) mass percent ZnO41%, V is weighed2O515%、B2O315%、Al2O315%、SiO22%、CaO1%、Bi2Se31% He
MoTe210% each raw material, the stirring rotation 1h mixing in batch mixer；
(2) mixture is placed in melting in high temperature resistance furnace, smelting temperature is 1200 DEG C, smelting time 45min；It is passed through nitrogen
Keep the temperature 45min；
(3) melten glass melted is rolled into thin slice；
(4) after thin slice being crushed to 1~3um of granularity, to glass powder carry out air current classifying screening median be 1.5~
2.5um to obtain the final product.
Application test：The median that glass powder is made in the present embodiment is 2.0~2.5um, and softening temperature is 485~500
℃.This glass powder is added to aluminium paste by mass content 4% to be uniformly mixed, this aluminium paste is then poured into the PERC cell silicon chips back side
In laser opening hole, aluminum back electrode is formed after high temperature sintering, bonds close bubble-free with silicon chip, the transformation efficiency for testing battery is
22.3%。
Embodiment 4
A kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powder, includes the following steps：
(1) mass percent ZnO50%, V is weighed2O510%、B2O315%、Al2O311%、SiO22%、CaO1%、Bi2Se310% He
MoTe21% each raw material, the stirring rotation 1h mixing in batch mixer；
(2) mixture is placed in melting in high temperature resistance furnace, smelting temperature is 1180 DEG C, smelting time 50min；It is passed through nitrogen
Keep the temperature 50min；
(3) melten glass melted is rolled into thin slice；
(4) after thin slice being crushed to 1~3um of granularity, to glass powder carry out air current classifying screening median be 1.5~
2.5um to obtain the final product.
Application test：The median that glass powder is made in the present embodiment is 1.8~2.3um, and softening temperature is 490~500
℃.This glass powder is added to aluminium paste by mass content 5% to be uniformly mixed, this aluminium paste is then poured into the PERC cell silicon chips back side
In laser opening hole, aluminum back electrode is formed after high temperature sintering, bonds close bubble-free with silicon chip, the transformation efficiency for testing battery is
22.5%。
Embodiment 5
A kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powder, includes the following steps：
(1) mass percent ZnO30%, V is weighed2O518%、B2O320%、Al2O312%、SiO23%、CaO3%、Bi2Se38% He
MoTe26% each raw material, the stirring rotation 1h mixing in batch mixer；
(2) mixture is placed in melting in high temperature resistance furnace, smelting temperature is 1200 DEG C, smelting time 50min；It is passed through nitrogen
Keep the temperature 45min；
(3) melten glass melted is rolled into thin slice；
(4) after thin slice being crushed to 1~3um of granularity, to glass powder carry out air current classifying screening median be 1.5~
2.5um to obtain the final product.
Application test：The median that glass powder is made in the present embodiment is 1.9~2.5um, and softening temperature is 495~510
℃.This glass powder is added to aluminium paste by mass content 5% to be uniformly mixed, this aluminium paste is then poured into the PERC cell silicon chips back side
In laser opening hole, aluminum back electrode is formed after high temperature sintering, bonds close bubble-free with silicon chip, the transformation efficiency for testing battery is
23.0%。
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form, Ren Hewei
Be detached from technical solution of the present invention content, according to the technical essence of the invention to made by above example it is any it is simple modification, etc.
With variation and modification, in the range of still falling within technical solution of the present invention.
Claims (5)
1. a kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powder, including following weight percent composition：
ZnO20~50%, V2O55~25%, B2O313~30%, Al2O310~25%, SiO21~5%, CaO1~5%, Bi2Se31~
10% and MoTe21~10%.
2. a kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powder according to claim 1, wherein Bi2Se3
Weight content is 2~5%.
3. a kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powder according to claim 1, wherein MoTe2
Weight content is 5~8%.
4. a kind of back of the body annealing point contact solar cell aluminium paste lead-free glass powder according to claim 2 or 3, wherein glass
The median of glass powder is 1.5~2.5um, and softening temperature is 480~510 DEG C.
5. a kind of preparation side of back of the body annealing point contact solar cell aluminium paste lead-free glass powder according to claim 4
Method includes the following steps：
(1) each raw material is weighed by weight percentage, the stirring rotation 1h mixing in batch mixer；
(2) it is 30~60min of melting in 1100~1250 DEG C of resistance furnace mixture to be placed in temperature, be passed through nitrogen heat preservation 30~
60min；
(3) melten glass melted is rolled into thin slice；
(4) after thin slice being crushed to 1~3um of granularity, to glass powder carry out air current classifying screen out median be 1.5~
2.5um is certified products.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810648514.6A CN108623145B (en) | 2018-06-22 | 2018-06-22 | Lead-free glass powder for back passivation point contact solar cell aluminum paste and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810648514.6A CN108623145B (en) | 2018-06-22 | 2018-06-22 | Lead-free glass powder for back passivation point contact solar cell aluminum paste and preparation method thereof |
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| CN108623145A true CN108623145A (en) | 2018-10-09 |
| CN108623145B CN108623145B (en) | 2022-02-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114057401A (en) * | 2021-11-15 | 2022-02-18 | 海南大学 | Selenide glass material and preparation method and application thereof |
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| CN102850942A (en) * | 2012-09-20 | 2013-01-02 | 东莞市聚亚光电科技有限公司 | Environment-friendly inorganic binder for silicon solar cell aluminum paste and its preparation method |
| CN104867536A (en) * | 2014-02-26 | 2015-08-26 | 赫劳斯贵金属北美康舍霍肯有限责任公司 | Molybdenum-containing glass frit for electroconductive paste composition |
| CN105502926A (en) * | 2015-12-11 | 2016-04-20 | 贵州佰博新材料科技有限公司 | Semiconductor surface passivation lead-free glass powder and preparing method thereof |
| CN106328249A (en) * | 2015-06-29 | 2017-01-11 | 江苏正能电子科技有限公司 | Back passivation solar cell aluminum paste |
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2018
- 2018-06-22 CN CN201810648514.6A patent/CN108623145B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102850942A (en) * | 2012-09-20 | 2013-01-02 | 东莞市聚亚光电科技有限公司 | Environment-friendly inorganic binder for silicon solar cell aluminum paste and its preparation method |
| CN104867536A (en) * | 2014-02-26 | 2015-08-26 | 赫劳斯贵金属北美康舍霍肯有限责任公司 | Molybdenum-containing glass frit for electroconductive paste composition |
| CN106328249A (en) * | 2015-06-29 | 2017-01-11 | 江苏正能电子科技有限公司 | Back passivation solar cell aluminum paste |
| CN105502926A (en) * | 2015-12-11 | 2016-04-20 | 贵州佰博新材料科技有限公司 | Semiconductor surface passivation lead-free glass powder and preparing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114057401A (en) * | 2021-11-15 | 2022-02-18 | 海南大学 | Selenide glass material and preparation method and application thereof |
| WO2023082410A1 (en) * | 2021-11-15 | 2023-05-19 | 海南大学 | Selenide glass material, preparation method therefor, and use thereof |
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