ALUMINIUM PASTE FOR SILICON SOLAR CELLS Russian patent published in 2014 - IPC H01B1/22 

FIELD: chemistry.

SUBSTANCE: aluminium paste for silicon solar cells includes particles of aluminium powder, an organic binding agent and glass-frit, and in the paste applied is finely-dispersed aluminium powder, particles of which have a spherical form, and with the application of a combination of aluminium powders with an average size of particles D50 not more than 3.0 mcm and 4.0-6.0 mcm in a ratio of (10:50):(90:50) respectively, with the following component ratio, in wt %: aluminium powder 70-80; organic binding agent 15-30; glass-frit 0-5. As glass-frit a mixture of bismuthate and lead-borosilicate glass with an average size of particles D50 not larger than 10.0 mcm, predominantly 2.0-3.0 mcm, can be applied. The paste can contain metalorganic compounds and/or siliconorganic compounds and/or copolymer in a quantity of 0-2 wt %. The paste can contain nanoparticles of amorphous silicon dioxide, with the size not more than 200 nm and specific surface 100-400 m²/g in a quantity of 0-2 wt %.

EFFECT: increase of short-circuit current, reduction of successive resistance of the solar cell, which leads to an increase of the efficiency factor, reduction of expenditures for the paste and solar cell production.

4 cl, 2 tbl