A simple fabrication process for 20% efficient silicon solar cells

Recently, a substantially simplified PERC silicon solar cell has been developed at ISFH with independently confirmed 1-sun efficiencies of up to 20.0%. This paper describes the details of the relatively simple cell fabrication process and experimentally characterizes the new cells. The simplified design involves reflection control by means of random pyramids, the direct evaporation of the front metal grid onto the random pyramids, elimination of the need for nontextured areas underneath the contact grid, and the use of a single phosphorous diffusion (1-step emitter).