The structural and optical properties of beta-FeSi2 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 beta-FeSi2 precipitates in a dislocation free sample has been observed to consist of a sharp line at 1.54 mu m and a weak peak at 1.46 mu m. Optical transmission measurements showed a direct band gap about 0.8 eV, smaller than in continuous beta-FeSi2 film. Calculation of the electronic bands of beta-FeSi2 for different values of the lattice parameters indicates that this reduction can be ascribed to band distortion provided by the lattice strain.
Correlation between structural and optical properties of ion beam synthesized beta-FeSi2 precipitates in Si
C Spinella;
1999
Abstract
The structural and optical properties of beta-FeSi2 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 beta-FeSi2 precipitates in a dislocation free sample has been observed to consist of a sharp line at 1.54 mu m and a weak peak at 1.46 mu m. Optical transmission measurements showed a direct band gap about 0.8 eV, smaller than in continuous beta-FeSi2 film. Calculation of the electronic bands of beta-FeSi2 for different values of the lattice parameters indicates that this reduction can be ascribed to band distortion provided by the lattice strain.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
