Characterization of laser carved micro channel polycrystalline silicon solar cell

► The efficiency of silicon solar cells was increased carving micro channel structures. ► Cell's efficiency was increased 0.23-1.50% as the structure radius varied 15-35 μm. ► Efficiency started to decrease when the structure radius was greater than 40 μm. ► Micro channels also improved the Fill Factor of polycrystalline silicon solar cells.