The invention discloses main grid
slurry containing silver-
copper alloy powder and a preparation method of the main grid
slurry. The main grid
slurry comprises the following components in percentage by weight: 75-90% of silver
powder, 0.2-2% of glass
powder, 0.1-20% of silver-
copper alloy powder and 8-25% of an organic carrier. The glass powder is one of Mn-Cu
system glass and Pb-Si-Ti
system glass; the silver-
copper alloy powder is silver-copper binary, ternary and
quaternary alloy powder, and the organic carrier comprises a
solvent, a
plasticizer, a thixotropic agent, a
thickening agent and a dispersing agent. According to the invention, the silver-
copper alloy powder is matched with the silver powder for use, so that under the condition of low glass content, a high-density main gate
electrode is realized, the resistivity of the main gate
electrode body is reduced, the
welding resistance of the main gate
silver paste is improved, a high-electrical-performance battery structure is further obtained, the glass content of the main gate paste is reduced, the open
voltage of the battery is improved, and the
photoelectric conversion efficiency of the battery is improved. As the silver-
copper alloy powder is used, the consumption of silver is reduced, the consumption of slurry is saved, and the cost is further reduced.