Silicon Powder-Based Wafers for Low-Cost Photovoltaics: Laser Treatments and Nanowire Etching

Figure 5

(a), (A) SEM image showing the surface textures of the nonirradiated pc-Si sample (only heat up to 600°C for about 2 h without laser treatment) subject to a MAWCE process and (a), (B) the corresponding higher resolution SEM image; (b), (A) nanowires formed by MAWCE in the region treated with medium laser power density of 12.0 kW cm⁻² and (b), (B) the corresponding higher resolution SEM image; (c), (A) no nanowires being detected in the region treated with a laser power density of 13.5 kW cm⁻² and (c), (B) the corresponding higher resolution SEM image.

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(b)

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