Industrial integration of interdigitated back-contact Si solar cells by laser ablation

Abstract

Interdigitated back-contact solar cells for high efficiency applications are usually manufactured in R&D laboratories by multiple subsequent lithography steps. Here the patterning by litho-free steps is proposed and implemented. The current status of the small area (2×2cm2 and 4×4cm2) n-type IBC solar cells integration flow is presented with exclusively laser-based patterning scheme: emitter, metal point contacts and electrode separation. Electrode separation is performed in 2 typical configurations: above emitter region or BSF region, where the 2nd location proofs to be beneficial. The best Suns Voc reaches up to 647 mV and p-FF up to 83%.