Figure 4: 6′′ mc-Si photovoltaic (PV) solar cells textured with average (a) 100 nm-thick and (b) 1 μm-thick nanorods. The feature difference is remarkable for the two solar cells. The 1 μm-thick nanorods generate the dark black color easily recognized by the naked eye and the grain boundaries also become nondistinguishable compared with the solar cell with surface textured using 100 nm-thick nanorods.