Glass powder for crystalline silicon solar positive silver paste as well as preparation method and application of glass powder

Abstract

The invention discloses glass powder for crystalline silicon solar front silver paste, which comprises the following raw materials: TeO2, PbO, Tl2O3, Bi2O3 and Li2O, selectively comprises one or more of WO3, ZnO, MgO, B2O3, CaO, TiO2, Fe2O3, Al2O3, Ag2O, ZrO2, Na2O, K2O and MoO, and selectively comprises an adhesion additive or a corrosion additive. According to the glass powder for the crystalline silicon solar positive silver paste, Tl2O3 is added, and the Tl2O3 and other raw materials are in a special formula proportion, so that the softening temperature of the glass powder is reduced, the conductivity is increased, and the dielectric loss is relatively small. A passivation layer, including a silicon nitride film and an aluminum oxide film of a PERC crystal silicon wafer, of the crystal silicon wafer can be etched through at a relatively low temperature. The slurry prepared from the glass can be sintered at 720-800 DEG C, and the attenuation problem of a crystalline silicon cell, especially a PERC crystalline silicon cell piece, under high-temperature sintering is reduced to a certain extent, so that the cell efficiency is improved.

Description

technical field

[0001] The invention relates to a glass powder and its preparation method and application, in particular to a glass powder for crystalline silicon solar energy front silver paste, its preparation method and application, and belongs to the technical field of solar photovoltaic cells. Background technique

[0002] In the whole industry chain of solar cells, the front silver paste is one of the core materials and technologies in the solar cell process. With the advancement of solar cell technology, especially for some advanced high-efficiency new structure cells, such as high-efficiency PERC cells, including ultra-high square resistance PERC cells, PERC-SE cells, double-sided alumina PERC cells, etc. These new structural cells further boost the cell efficiency to 22%. Continuously improved battery manufacturing processes and new designs play an important role. For each new battery technology and new design, the paste must also have corresponding innovations to...