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CN-121554198-B - Glass powder, conductive silver paste, preparation method of conductive silver paste, front electrode and N-type silicon solar cell

CN121554198BCN 121554198 BCN121554198 BCN 121554198BCN-121554198-B

Abstract

The invention discloses glass powder, conductive silver paste and a preparation method thereof, a front electrode and an N-type silicon solar cell, wherein the glass powder comprises, based on 100% of the total mole number of the glass powder, 0.1% -50.0% of a first oxide, 30.0% -80.0% of a second oxide, 0.1% -15.0% of a third oxide and 10.0% -50.0% of a fourth oxide, wherein the first oxide comprises one or more of Si, ti, zr, ge oxides, the second oxide comprises one or more of B oxides or one or more of B oxides and Al, ga, fe, la, Y oxides, the third oxide comprises one or more of W oxides or one or more of W oxides and Se, nb, te, P oxides, and the fourth oxide comprises one or more of Pb oxides, bi oxides or one or more of Pb oxides and Ba, zn, mg, ca oxides. The invention enables the N-type silicon solar cell to have high photoelectric conversion efficiency.

Inventors

  • SHU MINGFEI
  • TAN CUIYING
  • MA CAN
  • RAN HONGXIA
  • HE XIUMIN
  • CHEN XIAOLONG
  • LIU JIE

Assignees

  • 上海银浆科技有限公司

Dates

Publication Date
20260505
Application Date
20260120

Claims (9)

  1. 1. A glass frit suitable for use in a front electrode of an N-type silicon solar cell, the glass frit comprising the following components, based on 100% total moles of oxide of each component: 0.1% -50.0% of a first oxide; 30.0% -80.0% of a second oxide; 0.1% -15.0% of third oxide; 10.0% -50.0% of a fourth oxide; Wherein, the The first oxide includes one or more of the oxides of Si, ti, zr, ge; the second oxide comprises an oxide of B, or a combination of an oxide of B and one or more of the oxides of Al, ga, fe, la, Y; The third oxide comprises an oxide of W, or a combination of one or more of an oxide of W and an oxide of Se, nb, te, P; The fourth oxide includes one or more of an oxide of Pb, an oxide of Bi, or a combination of one or more of an oxide of Pb, an oxide of Bi and one or more of an oxide of Ba, zn, mg, ca; the glass frit further includes a fifth oxide, the fifth oxide including one or more of the Li, na, K, ag oxides, and the mole percent of the fifth oxide not exceeding 5% of the total mole content of the glass frit components.
  2. 2. The glass frit according to claim 1, wherein the glass frit has a particle size distribution in the range of 0.1 to 6.0 μm and a D50 distribution in the range of 0.6 to 1.8 μm.
  3. 3. A conductive silver paste suitable for a front electrode of an N-type silicon solar cell, characterized in that the conductive silver paste comprises, based on 100% of the total weight of the conductive silver paste: 85.0% -90.0% of silver powder; the glass frit according to any one of claims 1 to 2, 1.0% to 3.5%; 7.0% -12.0% of organic carrier; 0.0% -0.5% of inorganic additive.
  4. 4. The conductive silver paste of claim 3, wherein the silver powder is spherical or spheroidic, has a particle size distribution range of 0.2 to 3.0 μm and a D50 distribution range of 0.5 to 1.0 μm.
  5. 5. The conductive silver paste according to claim 3, wherein the inorganic additive comprises one or more of aluminum powder, silicon powder, lead oxide powder, tungsten trioxide powder, titanium dioxide powder and zinc oxide powder, the particle size distribution range of the powder is 0.1-3.5 μm, and the D50 distribution range is 0.2-1.2 μm.
  6. 6. The conductive silver paste of claim 3, wherein the organic carrier comprises an organic solvent, an organic resin, and an additive, and the contents of the components are as follows, based on 100% of the total weight of the organic carrier: 60.0% -85.0% of organic solvent; 5.0% -30.0% of organic resin; 2.0-15.0% of additive.
  7. 7. A method of preparing the conductive silver paste according to any one of claims 3 to 6, comprising the steps of: Preparing glass powder, namely weighing and mixing raw materials used by the glass powder according to a set proportion, melting, cooling and drying the raw materials, and grinding the raw materials to obtain the glass powder; Preparing an organic carrier, namely weighing raw materials of the organic carrier according to a set proportion, heating, stirring, mixing, centrifuging at a high speed, dispersing uniformly, and filtering to obtain the organic carrier; and (3) preparing conductive silver paste, namely respectively adding silver powder, prepared glass powder and inorganic additives into the prepared organic carrier according to the mass ratio, mixing and stirring uniformly, and grinding, viscosity adjusting and filtering to obtain the conductive silver paste.
  8. 8. A front electrode, characterized in that the front electrode is manufactured by printing the conductive silver paste suitable for the front electrode of an N-type silicon solar cell according to any one of claims 3-6 onto a silicon wafer and sintering the silicon wafer by LECO technology.
  9. 9. An N-type silicon solar cell comprising the front electrode of claim 8.

Description

Glass powder, conductive silver paste, preparation method of conductive silver paste, front electrode and N-type silicon solar cell Technical Field The invention relates to the technical field of silicon solar cells, in particular to glass powder, conductive silver paste, a preparation method of the conductive silver paste, a front electrode and an N-type silicon solar cell. Background Silicon solar cell power generation technology has advanced significantly, with the cell type gradually turning from early P-type to the currently prevailing N-type, such as N-type TOPCon cells, ABC cells, HPBC cells, etc. At present, an N-type TOPCon battery adopting an LECO (laser enhanced contact optimization) sintering technology gradually becomes the main stream of the market, so that the electronic silver paste matched with the N-type TOPCon battery is subjected to multiple iterations, the photoelectric conversion efficiency is improved in stages, a larger gap exists between the electronic silver paste and the theoretical efficiency limit of the N-type TOPCon battery, and the efficiency improvement space is still considerable. Disclosure of Invention In view of the above, the present invention aims to provide a glass powder, a conductive silver paste, a preparation method thereof, a front electrode and an N-type silicon solar cell, which are capable of well matching with the laser sintering type N-type silicon solar cell to provide high photoelectric conversion efficiency. The invention provides glass powder suitable for a front electrode of an N-type silicon solar cell, which comprises the following components in percentage by total mole of oxides of all components of 100 percent: 0.1% -50.0% of a first oxide; 30.0% -80.0% of a second oxide; 0.1% -15.0% of third oxide; 10.0% -50.0% of a fourth oxide; Wherein, the The first oxide includes one or more of the oxides of Si, ti, zr, ge; the second oxide comprises an oxide of B, or a combination of an oxide of B and one or more of the oxides of Al, ga, fe, la, Y; The third oxide comprises an oxide of W, or a combination of one or more of an oxide of W and an oxide of Se, nb, te, P; the fourth oxide includes one or more of an oxide of Pb, an oxide of Bi, or a combination of one or more of an oxide of Pb, an oxide of Bi and one or more of an oxide of Ba, zn, mg, ca. Further, the glass frit also includes a fifth oxide, the fifth oxide includes one or more of Li, na, K, ag oxides, and the mole percent of the fifth oxide is not more than 5% of the total mole content of the components of the glass frit. Further, the particle size distribution range of the glass powder is 0.1-6.0 mu m, and the D50 distribution range is 0.6-1.8 mu m. The invention also provides a conductive silver paste suitable for the front electrode of the N-type silicon solar cell, which comprises the following components by taking the total weight of the conductive silver paste as 100 percent: 85.0% -90.0% of silver powder; 1.0% -3.5% of the glass powder; 7.0% -12.0% of organic carrier; 0.0% -0.5% of inorganic additive. Further, the silver powder is spherical or spheroidic, the grain size distribution range is 0.2-3.0 mu m, and the D50 distribution range is 0.5-1.0 mu m. Further, the inorganic additive comprises one or more of aluminum powder, silicon powder, lead oxide powder, tungsten trioxide powder, titanium dioxide powder and zinc oxide powder, the particle size distribution range of the powder is 0.1-3.5 mu m, and the D50 distribution range is 0.2-1.2 mu m. Further, the organic carrier comprises an organic solvent, an organic resin and an additive, and the content of each component is as follows, based on the total weight of the organic carrier as 100 percent: 60.0% -85.0% of organic solvent; 5.0% -30.0% of organic resin; 2.0-15.0% of additive. The invention also provides a preparation method of the conductive silver paste, which comprises the following steps: Preparing glass powder, namely weighing and mixing raw materials used by the glass powder according to a set proportion, melting, cooling and drying the raw materials, and grinding the raw materials to obtain the glass powder; Preparing an organic carrier, namely weighing raw materials of the organic carrier according to a set proportion, heating, stirring, mixing, centrifuging at a high speed, dispersing uniformly, and filtering to obtain the organic carrier; and (3) preparing conductive silver paste, namely respectively adding silver powder, prepared glass powder and inorganic additives into the prepared organic carrier according to the mass ratio, mixing and stirring uniformly, and grinding, viscosity adjusting and filtering to obtain the conductive silver paste. The invention also provides a front electrode, which is prepared by printing the conductive silver paste suitable for the front electrode of the N-type silicon solar cell on a silicon wafer and sintering the silicon wafer by LECO technology. The invention also provides an N-type silicon