Abstract :
Maskless, random RIE texturing with a gas mixture of SF6/O2 (SO) and SF6/O2/Cl2 (SOC) was investigated to achieve higher efficiency
for mc-Si solar cells. Cone structure with aspect ratio of 3.7 was highly effective for reducing surface reflectance particularly for
wavelength from 310 to 700 nm and triangular pyramid structure with aspect ratio of 2 revealed rather uniform reduction of reflectance
with respect to the optimized wet texturing for whole wavelength range of 310–1100 nm. On the contrary to results of reflectance, performances
of fabricated cell were much better for triangular pyramid structure than cone structure. The degradation of cell performances
for the cone structure was assigned both to the poor e-h pair generation efficiency relevant to the formation of highly defective surface
layer with high density recombination centers, and ohmic shunt. The efficiency enhancement by 0.6% in mc-Si solar cells with triangular
pyramid structures was assigned also to the slightly enhanced e-h pair generation efficiency with respect to the reference cell.
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