Journal
JOURNAL OF LUMINESCENCE
Volume 143, Issue -, Pages 113-119Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2013.04.020
Keywords
Photoluminescence; FeSi; Iron monosilicide; Band structure; DOS; DFT
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Funding
- Advanced Materials for Device Application Project under the DST/CSIR National Centre for Nano-Structured Materials [HGER27S]
- India-Brazil-South Africa trilateral fund
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The procedures for the synthesis of amorphous epsilon-FeSi/Si core-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 8.0 nm which agrees with TEM value of 7.9 nm 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 410 nm, 1062 nm, 1414 nm and 1772 nm and absorption feature at 1000 cm(-1) from FTIR are explained from density functional theory (DFT) ab initio calculations. PL confirms the intra-band transition whereas FTIR agrees perfectly with the band-to-band transition whose band gap energy is 0.13 eV for FeSi. FTIR also unveils inter-band transition which DFT calculation could not predict. Raman spectroscopy data confirm FeSi and nano-Si presence. (C) 2013 Elsevier B.V. All rights reserved.
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