This paper is focused to study the variations of the photoluminescent properties of porous silicon when samples are immersed in deionized water or ethanol after etching. The emission peaks in the photoluminescence spectrum redshift and decreaseswith immersion time. We have observed that the photoluminescence disappears after about 20 h immersion in ethanol. The results are interpreted in terms of carbon contamination in the surface. This hypothesis is confirmed by Fourier transform infrared andX-ray photoelectron spectroscopies.
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