CN108623145B - Lead-free glass powder for back passivation point contact solar cell aluminum paste and preparation method thereof - Google Patents

Lead-free glass powder for back passivation point contact solar cell aluminum paste and preparation method thereof Download PDF

Info

Publication number
CN108623145B
CN108623145B CN201810648514.6A CN201810648514A CN108623145B CN 108623145 B CN108623145 B CN 108623145B CN 201810648514 A CN201810648514 A CN 201810648514A CN 108623145 B CN108623145 B CN 108623145B
Authority
CN
China
Prior art keywords
glass powder
lead
solar cell
aluminum paste
free glass
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.)
Active
Application number
CN201810648514.6A
Other languages
Chinese (zh)
Other versions
CN108623145A (en
Inventor
刘顺勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guizhou Byboard New Material Technology Co ltd
Original Assignee
Guizhou Byboard New Material Technology Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Guizhou Byboard New Material Technology Co ltd filed Critical Guizhou Byboard New Material Technology Co ltd
Priority to CN201810648514.6A priority Critical patent/CN108623145B/en
Publication of CN108623145A publication Critical patent/CN108623145A/en
Application granted granted Critical
Publication of CN108623145B publication Critical patent/CN108623145B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Conductive Materials (AREA)
  • Glass Compositions (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention discloses a lead-free glass powder for back passivation point contact solar cell aluminum paste and a preparation method thereof, wherein the lead-free glass powder comprises the following components in percentage by weight: 20-50% ZnO, V2O55～25%、B2O313～30%、Al2O310～25%、SiO21～5%、CaO1～5%、Bi2Se31 to 10% and MoTe21 to 10 percent. Stirring and rotating all the components in a mixer for 1h for mixing; placing the mixture in a resistance furnace at 1100-1250 ℃ for smelting for 30-60 min, introducing nitrogen and preserving heat for 30-60 min; rolling the melted glass into sheets; and crushing the sheet to a particle size of 1-3 um, and then carrying out airflow classification screening on the glass powder to obtain the lead-free glass powder with a median particle size of 1.5-2.5 um and a softening temperature of 480-510 ℃. The glass powder does not contain lead oxide, has low softening point, can form good ohmic contact between an aluminum electrode and a silicon substrate, and the prepared solar cell has high conversion efficiency.

Description

Lead-free glass powder for back passivation point contact solar cell aluminum paste and preparation method thereof
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to lead-free glass powder for back passivation point contact solar cell aluminum paste, and a preparation method of the lead-free glass powder for the back passivation point contact solar cell aluminum paste.
Background
The efficiency of a common crystalline silicon solar Cell is generally lower than 20%, and at present, in order to improve the conversion efficiency of the solar Cell and reduce the crystalline silicon cost, a back Passivated point contact solar Cell (PERC) is gradually a hotspot of solar Cell research because the efficiency of the back Passivated Emitter and reader Cell is higher than 20%. The key point of the PERC cell is back passivation and point contact, namely, a layer of passivation film is plated on the back of a silicon wafer of the cell, a back electrode adopts a point contact mode, and the passivation film is generally an insulator. In order to lead current out of the battery, when a PERC battery is prepared, holes with the diameter of about 40 microns are formed in the passivation film by laser, special aluminum paste is poured into the holes, the aluminum paste is only contacted with the silicon substrate at the positions of the holes, and an aluminum back electrode is formed after high-temperature sintering. Since the contact surface is small, it is called point contact. Therefore, the field effect of the back surface is maintained, the high recombination rate area of the interface of the aluminum and the silicon crystal is greatly reduced, and meanwhile, the incident light on the back surface can be led out of the current by the back electrode, so that the double-sided photoelectric conversion function is realized, and the cell efficiency is improved.
When the traditional aluminum paste for the crystalline silicon solar cell is sintered at high temperature under the local contact condition, silicon is easy to dissolve in aluminum, so that a contact interface of aluminum and a silicon substrate forms a cavity to be broken, the local contact resistance of aluminum and silicon is increased, and the formed aluminum electrode has poor conductivity. The technology of the novel battery plate puts new requirements on aluminum paste, and other substances are added into the aluminum paste to enhance the close contact of aluminum and silicon so as to form an aluminum back electrode with good conductivity. The glass powder is the most commonly used additive substance used in the PERC aluminum paste at present, and in the sintering process of the aluminum paste, the glass powder melts and corrodes an oxide layer on the surface of aluminum powder, so that the aluminum particles have conductivity; meanwhile, the glass powder and the aluminum particles are in close contact with each other to form aluminum-silicon alloy, so that the aluminum back electrode has good conductivity. Therefore, the change of the components and the content of the glass powder and the preparation method are important factors directly influencing whether the aluminum paste can have good ohmic contact with the silicon wafer, and are one of key links influencing the efficiency of the PERC crystal silicon battery. The glass powder used for aluminum paste is commonly PbO-ZnO-B2O 3 series, PbO-B2O 3-SiO 2 series, PbO-Bi 2O 3-B2O 3 series and the like. In order to seek a low softening point, these glass frits generally contain Pb element which is harmful to the environment and is harmful to the human body.
Chinese patent CN107673623A discloses a glass powder for double-sided PERC aluminum paste and a preparation method thereof, in the high-lead glass powder, a spiral network structure formed by lead oxide and silicon dioxide enables glass frit to destroy aluminum films and silicon substrates, promotes the formation of aluminum-silicon alloy and the compactness of the aluminum layers, has good conductivity, but the components of the glass powder still contain 20-50% of lead oxide, and is not suitable for environmental protection requirements.
In view of the above circumstances, it is an urgent technical problem to be solved by those skilled in the art to provide a lead-free glass frit for aluminum paste of a back-passivated point contact solar cell, which does not contain lead oxide, has a low softening point, and can form a good ohmic contact between an aluminum electrode and a silicon substrate, and a preparation method thereof.
Disclosure of Invention
The invention aims to overcome the defects and provide the lead-free glass powder for the aluminum paste of the back passivation point contact solar cell, which does not contain lead oxide, has low softening point and can form good ohmic contact between an aluminum electrode and a silicon substrate.
The invention relates to lead-free glass powder for back passivation point contact solar cell aluminum paste, which comprises the following components in percentage by weight: 20-50% ZnO, V2O55～25%、B2O313～30%、Al2O310～25%、SiO21～5%、CaO1～5%、Bi2Se31 to 10% and MoTe21～10%。
The above lead-free glass powder for back passivation point contact solar cell aluminum paste is preferably Bi2Se3The weight content is 2-5%.
The lead-free glass powder for the back passivation point contact solar cell aluminum paste is preferably MoTe2The weight content is 5-8%.
The lead-free glass powder for the back passivation point contact solar cell aluminum paste has the advantages that the median particle size of the glass powder is 1.5-2.5 mu m, and the softening temperature is 480-510 ℃.
The invention relates to a preparation method of lead-free glass powder for back passivation point contact solar cell aluminum paste, which comprises the following steps:
(1) weighing the raw materials according to the weight percentage, and stirring and rotating the raw materials in a mixer for 1 hour for mixing;
(2) placing the mixture in a resistance furnace at 1100-1250 ℃ for smelting for 30-60 min, introducing nitrogen and preserving heat for 30-60 min;
(3) rolling the melted glass into sheets;
(4) and crushing the sheet to a particle size of 1-3 um, and performing air flow classification screening on the glass powder to obtain a qualified product with a median particle size of 1.5-2.5 um.
Compared with the prior art, the invention has obvious beneficial effects, and the technical scheme can show that: ZnO and V are introduced into the glass powder2O5、B2O3The system collocation enables the glass material to have a special network structure and a very wide glass state forming area, has high fluxing property and plays a role in replacing PbO; the softening point of the glass can be obviously reduced after ZnO is added; adding B2O3The formation of a glass network structure is facilitated, and the wettability of glass to a silicon substrate is promoted; adding Bi2Se3The components can promote the glass body to corrode an oxide layer on the surface of aluminum powder in the aluminum paste, so that the aluminum electrode obtains good electrical property; adding MoTe2Can promote the glass powder system to form a special network structure, promote the aluminum particles to be mutually and tightly bonded, and form good ohmic contact between the aluminum electrode and the silicon substrate when the aluminum paste is sintered. The glass powder disclosed by the invention does not contain lead oxide, has a low softening point, can melt and corrode an oxide layer on the surface of aluminum powder, and aluminum particles are tightly bonded, so that an aluminum electrode obtains good electrical property, and meanwhile, the aluminum electrode and a silicon substrate form good ohmic contact, and the photoelectric conversion efficiency is favorably improved. The lead-free glass powder has good cohesiveness and low sintering temperature, can be suitable for back passivation point contact solar cell aluminum paste, belongs to a lead-free green environment-friendly product, has no harm to operators and the environment, and replaces the existing lead-containing glass powder.
Detailed Description
Example 1
A lead-free glass powder for back passivation point contact solar cell aluminum paste comprises the following steps:
(1) weighing 20 percent and V percent of ZnO by mass2O525%、B2O330%、Al2O310%、SiO21%、CaO2%、Bi2Se35% and MoTe2Stirring 8 percent of the raw materials in a mixer for 1 hour for mixing;
(2) placing the mixture into a high-temperature resistance furnace for smelting, wherein the smelting temperature is 1250 ℃, and the smelting time is 30 min; introducing nitrogen and keeping the temperature for 30 min;
(3) rolling the melted glass into sheets;
(4) and crushing the sheet to a particle size of 1-3 um, and performing air flow classification screening on the glass powder to obtain the glass powder with a median particle size of 1.5-2.5 um.
Application test: the median particle size of the glass powder prepared by the embodiment is 1.8-2.3 um, and the softening temperature is 480-490 ℃. The glass powder is added into aluminum paste according to the mass content of 5% and uniformly mixed, then the aluminum paste is poured into laser open holes in the back of a silicon wafer of the PERC battery, an aluminum back electrode is formed after high-temperature sintering, the aluminum back electrode is tightly bonded with the silicon wafer without air bubbles, and the conversion efficiency of the battery is tested to be 21.1%.
Example 2
A lead-free glass powder for back passivation point contact solar cell aluminum paste comprises the following steps:
(1) weighing 40 percent and V percent of ZnO by mass2O55%、B2O313%、Al2O325%、SiO25%、CaO5%、Bi2Se32% and MoTe25 percent of the raw materials are stirred and rotated for 1 hour in a mixer for mixing;
(2) placing the mixture in a high-temperature resistance furnace for smelting at 1100 ℃ for 60 min; introducing nitrogen and keeping the temperature for 60 min;
(3) rolling the melted glass into sheets;
(4) and crushing the sheet to a particle size of 1-3 um, and performing air flow classification screening on the glass powder to obtain the glass powder with a median particle size of 1.5-2.5 um.
Application test: the median particle size of the glass powder prepared by the embodiment is 1.5-2.0 um, and the softening temperature is 490-510 ℃. The glass powder is added into aluminum paste according to the mass content of 4% and uniformly mixed, then the aluminum paste is poured into laser open holes in the back of a silicon wafer of the PERC battery, an aluminum back electrode is formed after high-temperature sintering, the aluminum back electrode is tightly bonded with the silicon wafer without air bubbles, and the conversion efficiency of the battery is tested to be 22.0%.
Example 3
A lead-free glass powder for back passivation point contact solar cell aluminum paste comprises the following steps:
(1) weighing 41 percent and V percent of ZnO by mass2O515%、B2O315%、Al2O315%、SiO22%、CaO1%、Bi2Se31% and MoTe2Stirring and rotating 10 percent of the raw materials in a mixer for 1 hour for mixing;
(2) putting the mixture into a high-temperature resistance furnace for smelting at 1200 ℃ for 45 min; introducing nitrogen and keeping the temperature for 45 min;
(3) rolling the melted glass into sheets;
(4) and crushing the sheet to the particle size of 1-3 um, and performing air flow classification screening on the glass powder to obtain the glass powder with the median particle size of 1.5-2.5 um.
Application test: the median particle size of the glass powder prepared by the embodiment is 2.0-2.5 um, and the softening temperature is 485-500 ℃. The glass powder is added into aluminum paste according to the mass content of 4% and uniformly mixed, then the aluminum paste is poured into laser open holes in the back of a silicon wafer of the PERC battery, an aluminum back electrode is formed after high-temperature sintering, the aluminum back electrode is tightly bonded with the silicon wafer without air bubbles, and the conversion efficiency of the battery is tested to be 22.3%.
Example 4
A lead-free glass powder for back passivation point contact solar cell aluminum paste comprises the following steps:
(1) weighing 50 percent and V percent of ZnO by mass2O510%、B2O315%、Al2O311%、SiO22%、CaO1%、Bi2Se310% and MoTe21 percent of the raw materials are stirred and rotated for 1 hour in a mixer for mixing;
(2) putting the mixture into a high-temperature resistance furnace for smelting, wherein the smelting temperature is 1180 ℃, and the smelting time is 50 min; introducing nitrogen and keeping the temperature for 50 min;
(3) rolling the melted glass into sheets;
(4) and crushing the sheet to the particle size of 1-3 um, and performing air flow classification screening on the glass powder to obtain the glass powder with the median particle size of 1.5-2.5 um.
Application test: the median particle size of the glass powder prepared by the embodiment is 1.8-2.3 um, and the softening temperature is 490-500 ℃. The glass powder is added into aluminum paste according to the mass content of 5% and uniformly mixed, then the aluminum paste is poured into laser open holes in the back of a silicon wafer of the PERC battery, an aluminum back electrode is formed after high-temperature sintering, the aluminum back electrode is tightly bonded with the silicon wafer without air bubbles, and the conversion efficiency of the battery is tested to be 22.5%.
Example 5
A lead-free glass powder for back passivation point contact solar cell aluminum paste comprises the following steps:
(1) weighing 30 percent and V percent of ZnO by mass2O518%、B2O320%、Al2O312%、SiO23%、CaO3%、Bi2Se38% and MoTe2Stirring 6 percent of the raw materials in a mixer for 1 hour for mixing;
(2) putting the mixture into a high-temperature resistance furnace for smelting at 1200 ℃ for 50 min; introducing nitrogen and keeping the temperature for 45 min;
(3) rolling the melted glass into sheets;
(4) and crushing the sheet to the particle size of 1-3 um, and performing air flow classification screening on the glass powder to obtain the glass powder with the median particle size of 1.5-2.5 um.
Application test: the median particle size of the glass powder prepared by the embodiment is 1.9-2.5 um, and the softening temperature is 495-510 ℃. The glass powder is added into aluminum paste according to the mass content of 5% and uniformly mixed, then the aluminum paste is poured into laser open holes in the back of a silicon wafer of the PERC battery, an aluminum back electrode is formed after high-temperature sintering, the aluminum back electrode is tightly bonded with the silicon wafer without air bubbles, and the conversion efficiency of the battery is tested to be 23.0%.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the present invention without departing from the technical spirit of the present invention.

Claims (4)

1. The lead-free glass powder for the back passivation point contact solar cell aluminum paste comprises the following components in percentage by weight:
ZnO20～50％、V2O55～25％、B2O313～30％、Al2O310～25％、SiO21～5％、CaO1～5％、Bi2Se31 to 10% and MoTe21-10%, the median particle diameter of the glass powder is 1.5-2.5 um, and the softening temperature is 480-510 ℃.
2. The lead-free glass powder for aluminum paste of back-passivated point contact solar cell according to claim 1, wherein Bi is2Se3The weight content is 2-5%.
3. The lead-free glass powder for aluminum paste of back-passivated point contact solar cell according to claim 1, wherein MoTe2The weight content is 5-8%.
4. The preparation method of the lead-free glass powder for the aluminum paste of the back passivation point contact solar cell according to claim 1, comprising the following steps:
(1) weighing the raw materials according to the weight percentage, and stirring and rotating the raw materials in a mixer for 1 hour for mixing;
(2) placing the mixture in a resistance furnace at 1100-1250 ℃ for smelting for 30-60 min, introducing nitrogen and preserving heat for 30-60 min;
(3) rolling the melted glass into sheets;
(4) and crushing the sheet to a particle size of 1-3 um, and performing air flow classification screening on the glass powder to obtain a qualified product with a median particle size of 1.5-2.5 um.
CN201810648514.6A 2018-06-22 2018-06-22 Lead-free glass powder for back passivation point contact solar cell aluminum paste and preparation method thereof Active CN108623145B (en)

Priority Applications (1)

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

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
CN108623145A CN108623145A (en) 2018-10-09
CN108623145B true CN108623145B (en) 2022-02-01

Family

ID=63692043

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810648514.6A Active 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

Country Status (1)

Country Link
CN (1) CN108623145B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114057401B (en) * 2021-11-15 2022-11-18 海南大学 Selenide glass material and preparation method and application thereof

Citations (4)

* Cited by examiner, † Cited by third party
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
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
CN108623145A (en) 2018-10-09

Similar Documents

Publication Publication Date Title
US8927445B2 (en) Sealing agent with low softening temperature useful in the preparation of electronic devices
CN103915127B (en) Front silver paste for high sheet resistance silicon-based solar cell and preparing method of front silver paste
CN107195354A (en) One kind back of the body passivation silicon solar cell positive electrode silver paste and preparation method thereof
TW201813937A (en) Glass flour, and positive electrode silver paste and solar cell using the same
TW201514121A (en) Glass composition, glass frit containing same, glass paste containing same, and electrical/electronic component obtained using same
CN102898024A (en) Tellurium-containing glass material and preparation method and application thereof
CN102603196A (en) Glass mixing powder, preparation method thereof and conductive silver paste containing glass mixing powder
CN109180008B (en) Low-temperature glass powder, preparation method thereof and front electrode silver paste containing glass powder
JP2009099781A (en) Conductive paste material
CN101913763A (en) Glass composite for back surface field aluminum paste of solar battery and preparation method thereof
CN106098144A (en) A kind of glass dust and with its solar cell front side silver paste prepared and preparation method thereof
CN106504814B (en) Glass dust, positive silver paste and preparation method thereof
TWI469944B (en) A low melting point glass composition and a conductive paste material using the same
CN108623145B (en) Lead-free glass powder for back passivation point contact solar cell aluminum paste and preparation method thereof
CN114716150A (en) Glass powder for TOPCon battery front electrode slurry and preparation method and application thereof
US20120168689A1 (en) Lead-free conductive paste composition
CN109493993B (en) Silver paste for front electrode of crystalline silicon solar cell and preparation method thereof
CN105489266A (en) Composition of lead-free conductive slurry for crystalline silicon solar cell and preparation method for lead-free conductive slurry
KR101474677B1 (en) Conductive paste and solar battery cell using said conductive paste
CN104150775A (en) Low-melting-point tellurium glass used for photovoltaic cell conductive slurry and preparation method of low-melting-point tellurium glass
CN103951265B (en) A kind of silicon solar cell aluminium back surface field lead-free glass powder and its preparation method
CN114524618A (en) Glass powder for TOPCON N-type crystalline silicon solar cell front silver paste and preparation method thereof
CN113880440A (en) Low-content PbO modified glass powder for Topcon solar cell and preparation method thereof
CN105502949A (en) Bismuth oxide series low-melting-point glass for copper-aluminum sealing and preparation method thereof
CN107500549B (en) Microcrystalline glass powder, preparation method thereof and silver paste

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant