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Published online by Cambridge University Press: 15 February 2011
Since bulk silicon does not emit light in the visible part of the spectrum, the discovery of strong visible luminescence from porous silicon has been quite surprising and has generated significant interest. This material differs from bulk silicon in that it consists of interconnected silicon nanostructures, having very large surface to volume ratios. The first emission mechanism proposed involved carrier recombination within quantum size silicon particles, but more recent work has shown that surface emission models are more likely. In this paper, an interfacial oxygen center luminescence model will be discussed, with supporting experimental data. A direct correlation between the presence of these centers and the red photoluminescence in both as-made and oxidized PoSi will also be presented.