Figure 3From: Radial n-i-p structure SiNW-based microcrystalline silicon thin-film solar cells on flexible stainless steelBack-scattered electron SEM images of n-type SiNWs (a) before and (b) after acid treatment. The white dots (marked by white arrows) denote the metal catalyst droplets for n-type SiNW VLS growth. After acid treatment, the white dots are almost absent.Back to article page