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CN-122025220-A - Electrode slurry, preparation method, electrode and solar cell

CN122025220ACN 122025220 ACN122025220 ACN 122025220ACN-122025220-A

Abstract

The disclosure relates to the technical field of photovoltaic cells, and particularly provides electrode slurry, a preparation method of the electrode slurry, an electrode and a solar cell. The electrode slurry comprises a silver-based conductive material, a glass material and an organic carrier, wherein the glass material at least comprises Al 2 O 3 and B 2 O 3 , and the sum of the mole percentage of the Al 2 O 3 and the mole percentage of the B 2 O 3 is 60% -77% calculated by taking the mole percentage of the glass material as 100%. The electrode paste, the preparation method, the electrode and the solar cell are used for improving the electrical contact performance under the laser-assisted sintering process and improving the conversion efficiency of the cell.

Inventors

  • FENG JIWEI
  • HE HE
  • GUO CUIWEN
  • WANG ZHONGNAN

Assignees

  • 浙江光达电子科技有限公司

Dates

Publication Date
20260512
Application Date
20260318

Claims (10)

  1. 1. The electrode paste is characterized by comprising a silver-based conductive material, a glass material and an organic carrier, wherein the glass material comprises Al 2 O 3 and B 2 O 3 , and the sum of the mole percentage of Al 2 O 3 and the mole percentage of B 2 O 3 is 60% -77% calculated by taking the mole percentage of the glass material as 100%.
  2. 2. The electrode paste according to claim 1, wherein the glass material further comprises PbO and Bi 2 O 3 , the sum of the mole percent of PbO and the mole percent of Bi 2 O 3 being not less than 18%, calculated as 100% of the mole percent of the glass material.
  3. 3. The electrode paste of claim 1, wherein the glass material further comprises an oxide of at least one element of Zn, mn, Y, la, ga, sc, sb, co, ni, cr, fe, sm, in, W, ti, zr, si, ge, V and Nb.
  4. 4. The electrode slurry of claim 1, further comprising an inorganic co-agent comprising at least one of an aluminum-based co-agent, a boron-based co-agent, and a silicon-based co-agent.
  5. 5. The electrode slurry of claim 4, wherein the aluminum-based additive comprises at least one of elemental aluminum, an aluminum alloy, aluminum oxide, aluminum nitride, and aluminum carbide; The boron-based auxiliary agent comprises at least one of boron simple substance, boron oxide, boron nitride and boron carbide; The silicon-based auxiliary agent comprises at least one of simple substance silicon, silicon dioxide, silicon carbide, silicon nitride and silicate.
  6. 6. The electrode paste according to claim 4, wherein the silver-based conductive material is 70 to 90% by mass, the glass material is 1 to 10% by mass, the organic carrier is 8 to 20% by mass, and the inorganic auxiliary agent is 0 to 3% by mass, based on 100% by mass of the total mass of the electrode paste.
  7. 7. The electrode paste according to any one of claims 1 to 6, wherein the silver-based conductive material comprises elemental silver and/or a silver alloy.
  8. 8. A method for producing the electrode paste according to any one of claims 1 to 7, comprising: Mixing a silver-based conductive material and a glass material to obtain a blend; and mixing the blend with an inorganic auxiliary agent and an organic carrier to obtain the electrode slurry.
  9. 9. An electrode is characterized by comprising a grid line formed by printing, drying and sintering the electrode slurry according to any one of claims 1-7.
  10. 10. A solar cell comprising the electrode of claim 9.

Description

Electrode slurry, preparation method, electrode and solar cell Technical Field The disclosure relates to the technical field of photovoltaic cells, in particular to electrode slurry, a preparation method, an electrode and a solar cell. Background The tunneling oxide passivation contact (TunnelOxidePassivatedContact, TOPCon) solar cell has become an important development direction of the next generation high-efficiency crystalline silicon cell due to its excellent passivation performance and higher conversion efficiency. In the conventional electrode slurry, the glass system contains more highly corrosive oxide to realize penetration of the silicon nitride layer. With the introduction of Laser-assisted sintering technology (Laser-ASSISTEDSINTERING, LAS), the slurry is no longer dependent on the high corrosiveness of the glass, but rather focuses on achieving localized alloying and low damage contacts under the action of the Laser. However, the slurry contact performance in the prior art needs to be further optimized. Disclosure of Invention The present disclosure has been made in view of the above-described problems. The electrode paste, the preparation method, the electrode and the solar cell improve the contact performance under the laser-assisted sintering process, ensure good ohmic contact and realize higher photoelectric conversion efficiency. According to a first aspect of the present disclosure, there is provided an electrode paste comprising a silver-based conductive material, a glass material and an organic carrier, the glass material comprising at least Al 2O3 and B 2O3, the sum of the mole percentages of Al 2O3 and B 2O3 being 60% -77% calculated on the basis of the mole percentages of the glass material being 100%. According to a second aspect of the present disclosure, there is provided a method of preparing an electrode slurry, comprising: Mixing a silver-based conductive material and a glass material to obtain a blend; and mixing the blend with an inorganic auxiliary agent and an organic carrier to obtain the electrode slurry. According to a third aspect of the present disclosure, there is provided an electrode prepared according to the method of preparing an electrode according to the first aspect. According to a fourth aspect of the present disclosure, there is provided a solar cell comprising the electrode of the third aspect. According to one or more technical schemes provided by the embodiment of the disclosure, the electrode slurry comprises a silver-based conductive material, a glass material and an organic carrier, wherein Al 2O3 and B 2O3 with specific proportions are introduced into the glass material, and the sum of mole percentages of Al 2O3 and B 2O3 is controlled to be 60% -77%, so that the softening point, wettability and etching behavior of a glass system can be accurately regulated and controlled, the glass system can realize mild and controllable etching of a silicon nitride anti-reflection layer and a passivation structure under the condition of laser-assisted sintering, and excessive damage to a silicon substrate and increase of a carrier recombination center caused by conventional high-corrosivity glass are avoided. Meanwhile, the method can effectively promote the formation of uniform and compact local alloy contact between the silver-based conductive phase and the silicon matrix, obviously reduce the contact resistance and the series resistance of the electrode, improve the conductivity and the interfacial adhesion of the electrode, effectively improve the filling factor, the open-circuit voltage and the short-circuit current of the solar cell on the premise of ensuring excellent ohmic contact and high passivation effect, and finally realize the obvious improvement of the photoelectric conversion efficiency and the improvement of the performance stability of the cell. It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the technology claimed. Drawings The above and other objects, features and advantages of the present disclosure will become more apparent by describing in more detail embodiments thereof with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of embodiments of the disclosure, and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, without limitation to the disclosure. In the drawings, like reference numerals generally refer to like parts or steps. Fig. 1 is a flow chart of the preparation of an electrode slurry according to an embodiment of the present disclosure. Detailed Description In order to make the objects, technical solutions and advantages of the present disclosure more apparent, exemplary embodiments according to the present disclosure will be described