Visible and IR photoluminescence of c-FeSi@a–Si core–shell nano-fibres produced by vapour transport
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Date
2013
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
The procedures for the synthesis of amorphous ε-FeSi/Sicore–shell nanofibres by vapour transport in a
CVD configuration are reported. Crystallite studies by the Williamson-Hall method show the sizes to be
typically about 8.0nm which agrees with TEM value of 7.9nm fibre diameter with a compressive strain
of about 0.04. Features in the photoluminescence of these FeSi core–shells in both visible and IR are at
410nm,1062nm,1414nm and 1772nm and absorption feature at 1000cm−1 from FTIR are explained
from density functional theory(DFT) abinitio calculations. PL confirms the intra-band transition whereas
FTIR agrees perfectly with the band-to-band transition whose band gap energy is 0.13eV for FeSi. FTIR
also unveils inter-bandtransition which DFT calculation could not predict. Raman spectroscopy data
confirm FeSi and nano-Sipresence.
Description
Keywords
Photoluminescence, FeSi, Iron monosilicide, Band structure, DOS, DFT
Citation
Thabethe, S. et al. (2013). Visible and IR photoluminescence of c-FeSi@a-Si core-shell nanofibres produced by vapour transport. Journal of luminescence, 143: 113 – 119.