Revealing the local crystallinity of single silicon core-shell nanowires using tip-enhanced Raman spectroscopy

  1. Marius van den Berg,
  2. Ardeshir Moeinian,
  3. Arne Kobald,
  4. Yu-Ting Chen,
  5. Anke Horneber,
  6. Steffen StrehleORCID Logo,
  7. Alfred J. Meixner and
  8. Dai ZhangORCID Logo

Submitting author affiliation: Institute of Physical and Theoretical Chemistry, Eberhard Karls Universität Tübingen, Tübingen, Germany

Beilstein Arch. 2020, 202042.

Published 06 Apr 2020

  • Preprint


Tip-enhanced Raman spectroscopy is combined with polarization angle-resolved spectroscopy to investigate the nanometre-scale structural properties of core-shell silicon nanowires (crystalline Si core and amorphous Si shell), which were synthesized by platinum-catalyzed vapor-liquid-solid growth and silicon overcoating by thermal chemical vapour deposition. Local changes in the fraction of crystallinity are characterized for those silicon nanowires at an optical resolution of about 300 nm. Furthermore, we are able to resolve the variations in the intensity ratios between the crystalline Si and the amorphous Si Raman peaks by applying tip-enhanced Raman spectroscopy, at sample positions being eight nanometers apart. The local crystallinity revealed using confocal Raman spectroscopy and tip-enhanced Raman spectroscopy agree well with the high-resolution transmission electron microscopy measurements. Additionally, the polarizations of Raman scattering and the photoluminescence signal from the tip-sample nanogap are explored by combining polarization angle-resolved emission spectroscopy with tip-enhanced optical spectroscopy. Our work demonstrates the significant potential of resolving local structural properties of Si nanomaterials at the sub-10 nanometer scale using tip-enhanced Raman techniques.

Keywords: Tip-enhanced Raman spectroscopy; core-shell nanowire; silicon; polarization angle-resolved spectroscopy; local crystallinity

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van den Berg, M.; Moeinian, A.; Kobald, A.; Chen, Y.-T.; Horneber, A.; Strehle, S.; Meixner, A. J.; Zhang, D. Beilstein Arch. 2020, 202042. doi:10.3762/bxiv.2020.42.v1

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