Abstract
The structural and optical properties of β-FeSi 2 precipitates produced by ion beam synthesis have been investigated by transmission electron microscopy, photoluminescence (PL) analysis and near infrared transmission measurements. The PL spectrum of β-FeSi 2 precipitates in a dislocation free sample has been observed to consist of a sharp line at 1.54 μm and a weak peak at 1.46 μm. Optical transmission measurements showed a direct band gap about 0.8 eV smaller than in continuous β-FeSi 2 film. Calculation of the electronic bands of β-FeSi 2 for different values of the lattice parameters indicates that this reduction can be ascribed to band distortion provided by the lattice strain.
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