An electro-conductive paste comprising coarse inorganic oxide particles in the preparation of electrodes in MWT solar cells

摘要

The invention relates to an electro-conductive paste comprising coarse SiO 2 particles in the preparation of electrodes in solar cells, particularly in the preparation of electrodes in MWT solar cells, particularly in the preparation of the metal wrap through, or plug, electrode in such solar cells. In particular, the invention relates to a solar cell precursor, a process for preparing a solar cells, a solar cell and a module comprising solar cells. The invention relates to a solar cell precursor at least comprising as precursor parts:
i) a wafer (101) with at least one hole (315) with a Si surface (113);
ii) an electro-conductive paste (105) at least comprising as paste constituents:
a) metallic particles;
b) an inorganic reaction system;
c) an organic vehicle; and
d) inorganic oxide particles having no glass transition temperature below about 750°C or a glass transition temperature which is at least about 50 °C higher than the glass transition temperature of the inorganic reaction system; and
e) an additive;
comprised by the hole.