Abstract
The PERC solar cell technology increases conversion efficiency by adding a dielectric passivation layer at the rear side of the cell. This requires back-side tabbing paste to maximize the protection of this dielectric layer from damage during the metallization step. We have developed a novel silver back-side tabbing paste for mono- and multi-crystalline PERC solar cell wafers. The new tabbing paste helps PERC to realize its higher efficiency and longer term reliability. In this paper we report our new generation backside tabbing paste for PERC application. The new generation tabbing paste contains new glass chemistry which minimizes the reaction between tabbing paste and passivation layer, showing >2 mV Voc gain. New tabbing paste also demonstrates higher aged adhesion > 3N.
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