The authors present their work on laser-enhanced contact optimization (LECO) on iTOPCon solar cells. LECO improves the metal-semi-conductor contact resistivity ρc on the boron emitter and the n-TOPCon side from an underfired (thermal budget too low) state of 2.9 and 14.1 mΩcm2 to an enhanced state of 1.8 and 2.9 mΩcm2. Therefore, it enables the reduction of the optimal peak firing temperature, which leads to a decrease of metal induced recombination mainly on the boron emitter side and to minor degree on the n-TOPCon side, as shown in this work.
PERC-basierte geschindelte Solarzellen und Module am Fraunhofer ISE
