CURRENT-CONDUCTING SILVER PASTE FOR REAR ELECTRODE OF SOLAR CELL Russian patent published in 2013 - IPC H01B1/20 

FIELD: electricity.

SUBSTANCE: current-conducting silver paste for rear electrode of solar cell includes fine powder of silver 45-50 wt %, frit 3-9 wt %, preferably 3-6 wt %, and organic bonding agent 46-52 wt %. Silver powder has average size of particles D50 equal to 1.5-5.0 mcm, and 38-48 wt % of silver powder may have average size of particles D50 equal to 2.0-5.0 mcm, preferably 2.5-3.0 mcm, and 2-10 wt % of silver powder may have average size of particles D50 equal to 1.5-4.0 mcm, preferably 1.5-1.8 mcm. Organic binding agent as film-forming one contains ethyl cellulose in quantity of 4-10 wt %.

EFFECT: reducing paste consumption during screen-printing; reducing content of precious metals powder in paste, improving rheological and printing properties of paste as well as adhesive properties.

4 cl, 3 dwg, 1 tbl