The role of surface oxidation on luminescence degradation of porous silicon

▶ The degradation of photoluminescence spectra of porous silicon during dark-aging and photo-aging was studied. ▶ Blue shifts in the photoluminescence spectra were observed. ▶ The change in the photoluminescence spectra has been investigated by overlapping of two different PL bands. ▶ Quantum size effect as being responsible for the porous silicon luminescence which, in addition, is influenced by the chemical composition of the porous silicon surface.