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Structural, optical and terahertz properties of graphene-mesoporous silicon nanocomposites

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Abstract

We investigate the structural, optical and terahertz properties of graphene-mesoporous silicon nanocomposites using Raman, terahertz time-domain and photoluminescence spectroscopy. The nanocomposites consist of a free-standing mesoporous silicon membrane with its external and pore surfaces coated with few-layer graphene. Results show a stabilization of the porous silicon morphology by the graphene coating. The terahertz refractive index and absorption coefficient were found to increase with graphene deposition temperature. Four bands in the 1.79–2.2 eV range emerge from the PL spectra of the nanocomposites. The broad bands centered at 1.79 eV and 1.96 eV were demonstrated to originate from Si nanocrystallites of different sizes. The narrower bands at 2.11 eV and 2.14 eV could be related to a thin SiC film at the Si/C interface.

Graphical abstract: Structural, optical and terahertz properties of graphene-mesoporous silicon nanocomposites

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Publication details

The article was received on 13 Aug 2019, accepted on 23 Nov 2019 and first published on 25 Nov 2019


Article type: Paper
DOI: 10.1039/C9NA00502A
Nanoscale Adv., 2020, Advance Article
  • Open access: Creative Commons BY-NC license
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    Structural, optical and terahertz properties of graphene-mesoporous silicon nanocomposites

    D. J. Jubgang Fandio, S. Sauze, A. Boucherif, R. Arès and D. Morris, Nanoscale Adv., 2020, Advance Article , DOI: 10.1039/C9NA00502A

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