A-108 aluminum paste is printed as a back electrode on single or polycrystalline silicon solar cells. A-568 Pb-free silver front-side paste is used for back contact on silicon solar cells. A-368 high-conductivity back-surface paste adheres to aluminum. All are metallization pastes for photovoltaic cell manufacturing.

Giga Solar Materials Corp., http://www.gigasolar.com.tw/english.asp