PHOTOLUMINESCENCE OF POROUS SILICON

Excitation spectroscopy of the luminescence, selective excitation phot oluminescence, time-resolved photoluminescence and time-decay measurem ents of the photoluminescence have been carried out on various porous silicon samples. A very rich phenomenology of the luminescence has bee n measured. Strong evidence has been found for emission processes due to a strongly disordered system both topologically and energetically. No definitive responses about the origin of the luminescence in p-Si a re found but some promising points for further investigations are unde rlined.