Abstract
The photoluminescence emission in silicon powder grown by plasma enhanced chemical vapour deposition has a very unusual dependence on pressure. Its intensity diminishes exponentially, I PL I 0 exp(- P/P 0 ), where P 0 has a value of several pascals. Consequently it is detectable only under vacuum. This dependence is analysed within the framework ofa multistep multiphoton excitation process. It is shown that an exponential dependence on pressure of the dynamic constants (lifetimes and optical cross-sections involved in the model) can account qualitatively for all the experimental results. MST/3288
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