DIMENSIONS OF LUMINESCENT OXIDIZED AND POROUS SILICON STRUCTURES

X-ray absorption measurements from H-passivated porous Si and from oxi dized Si nanocrystals, combined with electron microscopy, ir absorptio n, alpha recoil, and luminescence emission data, provide a consistent structural picture of the species responsible for the visible luminesc ence observed in these samples. The mass-weighted average structures i n por-Si are particles, not wires, with dimensions significantly small er than previously reported or proposed.