19.1 % laser-doped selective emitter P-type multi-crystalline UMG silicon solar cell

In this paper standard screen printed solar cells and laser-doped selective emitter solar cells are fabricated on p-type multi-crystalline silicon wafers from three upgraded-metallurgical grade feedstock suppliers. A cell efficiency of UMG material is demonstrated above 17 % using standard screen printing technology and a full area aluminum back surface field. By employing a laser-doped selective emitter and self-aligned light-induced plated contacts, a 1-2 % absolute increase in cell efficiency is obtained with a peak efficiency of 19.1 %, when still employing a full area aluminum-back surface field.