High-compactness boiling-resistant solar aluminum paste

Abstract

The invention provides high-compactness boiling-resistant solar aluminum paste. The high-compactness boiling-resistant solar aluminum paste is characterized by comprising, by weight, 75-78% of spherical aluminum powder, 20-25% of organic binding agents, 1-2% of glass powder, and 0.1-0.2% of boron carbide micro powder, wherein the spherical aluminum powder comprises, by weight, 10-20% of spherical aluminum powder of 7-8 micrometers, 10-20% of spherical aluminum powder of 6-7 micrometers, 40-60% of spherical aluminum powder of 5-6 micrometers and 10-20% of spherical aluminum powder of 1-2 micrometers. The organic binding agents comprise, by weight, 94.5% of mixed solvent, 2% of low grade ethyl cellulose, 4% of high grade of ethyl cellulose and 0.5% of hydrogenated castor oil. Through adjustment and optimization of a formula, boiling-resistant performance of an aluminum back surface field is significantly improved.

Description

technical field [0001] The invention relates to a solar aluminum paste, in particular to a high-density boiling-resistant solar aluminum paste. Background technique [0002] The back field of solar cells is usually sintered by aluminum paste. Aluminum is an active metal. When solar cells are used in the natural environment for a long time, if the activity of aluminum in the back field is too high, it may make the aluminum back field and the natural environment Moisture in the environment reacts, resulting in the destruction of the aluminum back field, which in turn leads to a greatly shortened service life of the cell. At present, the determination of the reactivity of the aluminum back field by water boiling has been accepted by the majority of cell manufacturers, but the country has not yet issued relevant industry norms and standards for water boiling tests, and most of the solar aluminum pastes of domestic manufacturers have water boiling resistance. Both are poor. [...

AI Technical Summary

Problems solved by technology

[0002] The back field of solar cells is usually sintered by aluminum paste. Aluminum is an active metal. When solar cells are used in the natural environment for a long time, if the activity of aluminum in the back field is too high, it may make the aluminum back field and the natural environment Moisture in the environment reacts, resulting in the destruction of the aluminum back field, which greatly shortens the service life of the cell

At present, the determination of the reactivity of the aluminum back field by water boiling has been accepted by the majority of cell manufacturers, but the country has not yet issued relevant industry norms and standards for water boiling tests, and most of the solar aluminum pastes of domestic manufacturers have water boiling resistance. are poor