Abstract
The characteristics of free-standing porous silicon (por-Si) films were studied using their optical transmission, photoluminescence (PL), and photoluminescence excitation spectra. The transmission spectra exhibit no features within the emission bands or near PL excitation thresholds, which is evidence that nonluminescent por-Si fragments play a dominating role in the process of light absorption. This fact indicates that the optical transmission spectra cannot be used as a source of information on the bandgap energy of charge carriers in luminescent silicon nanocrystallites. The required energy spectrum parameters can be roughly evaluated using the PL excitation spectrum.
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