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Abstract
Stable ultraviolet (UV) photoluminescence (PL) has been observed at room temperature in porous silicon (PSi) fabricated by photoetching in aqueous alkali fluoride solutions. The aqueous solutions used are 1M NaF and 1M KF. They give an alkaline reaction caused by partial hydrolysis. The PL peaks at ∼3.3eV have a full width at half maximum of ∼0.1eV, which is much smaller than those reported previously (⩾0.5eV). Spectral analyses suggest that both quantum confinement and surface passivation effects enable the observation of UV emission in NaF- and KF-prepared PSi samples.
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