Origin of visible photoluminescence from porous silicon as studied by Raman spectroscopy
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In this paper we discuss the different models proposed to explain the visible luminescence in porous silicon (PS). We review our recent photoluminescence and Raman studies on PS as a function of different preparation conditions and isochronal thermal annealing. Our results can be explained by a hybrid model which incorporates both nanostructures for quantum confinement and silicon complexes (such as SiH x and siloxene) and defects at Si/SiO2 interfaces as luminescent centres.
KeywordsPorous silicon nanoparticles photoluminescence Raman spectroscopy
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