| abstract |
In general, the invention relates to electro-conductive pastes containing binary glass frits and photovoltaic solar cells, preferably n-type photovoltaic solar cells. More specifically, the invention relates to solar cell precursors, processes for preparation of solar cells, solar cells and solar modules. The invention relates to a solar cell precursor comprising as precursor parts i. a wafer with a back face and a front face, wherein the front face comprises a p- doped layer ii. a first paste comprising - Ag particles; - Al particles in a range from about 0.01 to about 5 wt. %, based on the total weight of the paste; - a vehicle; - a glass frit in a range from about 0.1 to about 5 wt. %, based on the total weight of the paste, wherein the glass frit comprises a first glass frit with a glass transition temperature T gl and a further glass frit with a glass transition temperature T gf , wherein T gf differs from T gl by at least about 10 °C; - an additive; superimposed on a first area on said p-doped layer. |