In general, the invention relates to electro-conductive pastes comprising particles with comprise Al, Si and Mg and their use in the preparation of photovoltaic solar cells, preferably n-type photovoltaic solar cells. More specifically, the invention relates to electro-conductive pastes, solar cell precursors, processes for preparation of solar cells, solar cells and solar modules. The invention relates to a paste comprising as paste constituents: a. At least 80 wt. % silver powder, based on the total weight of the paste; b. An inorganic reaction system; c. An organic vehicle; d. Additive particles comprising Al, Mg and Si as particle constituents, wherein Al, Mg and Si are present in the additive particles as elements or in one or more single phase mixtures of elements comprising one or more of the particle constituents, or a combination of one or more elements with one or more single phase mixtures of elements.