Superfine lead-free glass powder for electrode slurry of solar battery, and preparation method thereof

Abstract

The invention discloses superfine lead-free glass powder for the electrode slurry of a solar battery and a preparation method thereof. Lead-free glass comprises 20% to 30% of SiO2, 40% to 70% of Bi2O3, 2% to 15% of B2O3, 1% to 10% of Sb2O3, 1 to 3% of ZnO and 1 to 3% of ZrO2. The preparation method comprises the following steps: (1) weighing of a mixture according to the above-mentioned proportion and addition of a pore forming agent (C and PVA); (2) melting of the mixture; (3) water quenching; and (4) planetary ball milling (sieving). The superfine glass powder is prepared through ball milling of environment-friendly lead-free porous glass powder by using this method; and compared with conventional products, the prepared lead-free superfine glass powder has the advantages of short ball milling time, low energy consumption, a small particle size and high activity. A high photoelectric conversion rate is obtained when the lead-free superfine glass powder is used for photovoltaic positive electrode slurry; after electrode silver slurry is sintered, low volume resistance is obtained, bonding strength between an electrode silver layer and Si is improved, and sintering temperature of silver slurry is reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of lead-free glass powder, in particular to a preparation method of ultrafine lead-free glass powder for the conductive silver paste of the front electrode of a solar cell. Background technique [0002] Solar energy is a green, non-polluting, inexhaustible energy source, and people pay attention to these advantages. A crystalline silicon solar cell is a semiconductor device that can convert solar energy into electrical energy. It converts solar energy into electrical energy under the condition of light, and collects and transmits the current through grid lines and electrodes. The surface electrodes and grid lines of crystalline silicon solar cells are made of conductive silver paste through high-speed and high-precision screen printing, low-temperature drying, and high-temperature sintering. The conductive silver paste is usually prepared from silver powder, glass powder and organic vehicle. ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is aimed at the problems of high softening temperature of the glass component in the current silicon-based photovoltaic electrode paste, large particle size of glass powder, and large energy consumption in the preparation process. The present invention prepares photovoltaic paste by ball milling porous glass powder Ultra-fine lead-free glass powder is used as material. The lead-free glass powder has low melting temperature, small particle size, simple production method and low energy consumption. The photovoltaic electrode slurry prepared with primary glass powder has good adhesion and high photoelectric conversion rate.