Optical properties and phase transformations in α and β iron disilicide layers

Photoluminescence Properties from β-FeSi2 Film Epitaxially Grown on Si, YSZ and Si//YSZ

“…The A-band luminescence was primarily enhanced as annealing time increased for the films on (111)Si substrate. The peak energy of A-band is extremely close to that of -FeSi 2 reported by Hunt et al 13) and Martinelli et al 14) Thus, the A-band spectrum can be considered to intrinsic emission of -FeSi 2 . In contrast, the B-and C-band luminescence was primarily enhanced as annealing time increased for the films on (111)Si//(111)YSZ substrates.…”

Phase-Controlled Synthesis of Iron Silicide (Fe3Si and FeSi2) Nanoparticles in Solution

“…When the nanoparticles are further heated (above 600 °C), the major peaks of Fe 3 Si phase partially collapse as depicted in Figure b (V). Even further heating the nanoparticles to 700 °C results in the formation of the mixed phase of α-FeSi 2 , β-FeSi 2 , and Fe 5 Si 3 (IV). ,, When the nanoparticles are heated to 900 °C, they exhibit the same phase as in 700 °C, but sharpening and narrowing of the XRD peaks is observed because of annealing (III). This is different from the bulk phase diagram of iron and silicon where Fe 5 Si 3 is the expected product to be obtained upon annealing in the iron rich samples.…”

Iron disilicide formation by Au–Si eutectic reaction on Si substrate

“…Moreover, its high optical absorption coefficient (higher than 10 5 cm À1 above 1.0 eV) can be advantage of using in photovoltaic devices [5]. Most b-FeSi 2 samples have been annealed at 800-900 8C for 2-40 h to enhance the PL intensity and photovoltaic properties [6][7][8]. It has been suggested that the enhancement of those optical properties by the post-annealing contributes to the decrease in the density of non-radiative centres in b-FeSi 2 crystal [9,10].…”