NOVELTY - Process (P1) of the formation of electrically conductive silver back electrode of PERC (passivated emitter and rear contact) silicon solar cell involves: providing silicon wafer having ARC (antireflective coating) layer on its front-side and perforated dielectric passivation layer on its back-side; applying and drying silver paste to form silver back electrode pattern on the passivation layer on the back-side of the silicon wafer; and firing the dried silver paste comprising particulate silver and an organic vehicle.    USE - For the formation of an electrically conductive silver back electrode of PERC (passivated emitter and rear contact) silicon solar cell (claimed).    ADVANTAGE - The process allows for the production of PERC silicon solar cells with improved electrical efficiency; and used silver paste for the production of the silver back electrode that does not damage the perforated dielectric passivation layer on the silicon wafer's back-side during firing. The fired silver paste adheres well to the back-side perforated passivation layer and thus gives rise to a long durability or service life of the PERC silicon solar cells.    DETAILED DESCRIPTION - A process (P1) of the formation of an electrically conductive silver back electrode of a PERC (passivated emitter and rear contact) silicon solar cell involves: providing a silicon wafer having an ARC (antireflective coating) layer on its front-side and a perforated dielectric passivation layer on its back-side; applying and drying a silver paste to form a silver back electrode pattern on the perforated dielectric passivation layer on the back-side of the silicon wafer; and firing the dried silver paste, where the wafer reaches a peak temperature of 700-900 degrees C, where the silver paste has no or only poor fire-through capability and comprises particulate silver and an organic vehicle. INDEPENDENT CLAIMS are included for the following:    (1) an electrically conductive silver back electrode of a PERC silicon solar cell made by the process (P1); and    (2) a PERC silicon solar cell comprising the electrically conductive silver back electrode.