Abstract
Ternary silicide β-(Fe1−x Ru x )Si2 polycrystalline thin films were fabricated by RF magnetron sputtering. The crystal structure of β-(Fe1−x Ru x )Si2 was the same orthorhombic (space group: Cmca) as β-FeSi2 in the Ru composition of 0 ≤ x ≤ 0.63. The lattice constants increased with increasing Ru composition, and Vegard’s law was obtained. The wavenumber of the Raman line of Fe−Fe and Fe−Si vibrations shifted to a lower wavenumber with increasing Ru composition. The 1.5 μm photoluminescence (PL) was observed in Si/β-(Fe1−x Ru x )Si2/Si double heterostructure (DH) with x = 0.57. The PL lifetime of the Ru-doped DH sample was shorter than that of the β-FeSi2 (x = 0) DH sample.
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