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, IPL ∝ I0 exp(-p/p0), where P0 has a value of several pascals. Consequently it is detectable only under vacuum. This dependence is analysed within the framework of a 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.
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