Figure 4From: Structure, morphology, and photoluminescence of porous Si nanowires: effect of different chemical treatmentsPL spectra from the as-grown sample etched for 60 min and samples after different chemical treatments. The spectrum from the as-grown sample is denoted by (1), the sample after an HF dip by (2), after HF/piranha by (3), and after HF/piranha/HF by (4). The vertical dashed line is a guide to the eye.Back to article page