Change of the optical properties of porous silicon by post anodization treatments

Optical properties of as prepared porous silicon (PS) were compared with those of thermally treated and chemically cleaned samples. The change of the photoluminescence (PL) spectra correlated with ellipsometric, reflectance and Raman measurements leads us to conclude that the adsorbed species on the PS nanocrystalline structure play an important role in the origin of the PL emission, at least for as-anodized samples.