Time-resolved luminescence spectrum and radiation recombination progress in surface and core of porous silicon

Abstract

Time-resolved luminescence spectra (TRLS) of porous silicon (PS) in the delay time range of 10/sup -9/-10/sup -6/ s were investigated. The luminescence spectra include the blue zone with decay time of the order of nanoseconds and the red zone with longer decay time. Recombination mechanisms in the core and in the surface states were used to explain this experimental result. The existence of discrete peaks in the blue zone shows that the luminescence is due to nano-scale crystals.