ALUMINUM PASTES AND USE THEREOF IN THE PRODUCTION OF PASSIVATED EMITTER AND REAR CONTACT SILICON SOLAR CELLS

摘要

An aluminum paste comprising particulate aluminum, an organic vehicle and glass frit selected from (i) lead-free glass frits with a softening point temperature in the range of 550 to 611°C and containing 11 to 33 wt.-% of SiO2, >0 to 7 wt.-% of AI2O3 and 2 to 10 wt.-% of B2O3 and (ii) lead-containing glass frits with a softening point temperature in the range of 571 to 636°C and containing 53 to 57 wt.-% of PbO, 25 to 29 wt.-% of SiO2, 2 to 6 wt.-% of AI2O3 and 6 to 9 wt.-% of B2O3, useful in the production of aluminum back electrodes of PERC silicon solar cells.