Laser structuring of crystalline silicon thin-film solar cells on opaque foreign substrates

Crystalline silicon thin-film solar cells were fabricated on graphite substrates. A laser ablation process was developed for edge isolation of the thin-film cells. The shunt resistance was comparable to otherwise identical cells isolated by plasma etching, while the reproducibility of the laser isolation process was higher. The solar cells were characterized by current–voltage and light beam induced current measurements (LBiC). No interference was detected along the ablated edges. Spatial variations of the minority carrier lifetime are attributed to the grain structure of the seeding layer obtained by the zone melting recrystallization (ZMR).

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► Crystalline silicon thin-film solar cells with zone melted seeding layer were investigated.
► Laser edge isolation process with optimized shunt resistance was developed.
► Light beam induced current (LBiC) showed no influence of the laser isolation on the edge region.
► Contrarily, LBiC showed the influence of the seeding layer on quantum efficiency.