Luminescence in porous silicon-surface vs. bulk

The mechanism of luminescence in porous silicon still remains poorly unders tood. The main point of controversy is whether the luminescence is due to r ecombination in the quantum size structures that constitute porous silicon or whether it is dominated by surface recombination. In this paper, we pres ent evidence that emphasises the role that surface recombination plays in t he luminescence of porous silicon. In this framework, we also attempt to re concile the resonant luminescence data (which argues for "bulk" recombinati on) with our results.