Photoluminescence enhancement of porous silicon prepared with ammonium sulfide pre-treated silicon

As-grown porous silicon prepared with ammonium sulfide pre-treated silicon show stable photoluminescence characteristics due to high Si–N/PS interface quality and less damage PS with Si–N passivation. After aging in air for 6 months, it shows much stronger photoluminescence intensity and stable wavelength due to higher Si–ON/PS interface quality and less damage of PS with Si–O–N passivation from the oxidation of Si–N.