Effect of Ag Powder and Glass Frit in Ag Paste on Front Contract of Silicon Solar Cells

Screen-printed Ag paste for solar cells is studied by investigating the effect of Ag powder and glass frit on Ag contract formation. Small Ag particle paste is well sintered, forming a denser contract surface with lower bulk resistance and better interface structure compared to that of large Ag particle paste. Flaky Ag particle paste also performs better than that of spherical Ag particle with similar size. Glass with neither too high glass transition temperature (Tg) nor too low Tg is appropriate for Ag paste. In experiment, Ag paste of glass frit with Tg of ∼6100C shows the lowest bulk resistance. These results may provide reference in practical.