We report the results of a Raman scattering study of an array of well aligned and individual isolated boron doped silicon nanowires (B-SiNW). Nanowires were grown by VLS utilizing CVD (Chemical Vapor Deposition) technique. Different excitation wavelengths were used (514nm and 632nm) to check the heating effects and the dependence of the Raman spectra on the excitation laser line. An asymmetric broadening and a shift of the LO-TO Raman band (520cm^-1) and boron feature at 620cm^-1 have been observed in all analyzed samples. The asymmetry and shift are the result of the phonons interactions with the continuum of filled electron states, where increased number of free carriers are provided by boron doping.. Our data can be well fitted with a Fano-shape line, with the asymmetry parameter q<4. This indicates that the free carriers’ concentration exceeds 10¹⁹ cm^-3 [1]. Another factor that influence the silicon peak position is a sample laser heating. A nanowire perpendicular to the surface has been measured in function of a laser spot distant from the surface. A shift of 1-2cm^-1 is visible.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/15890 must be provided.

1. Raman spectroscopy studies of metal - carbon nanotubes composite materials.
2. Laser radiation-induced effects in Raman spectra of multiwalled carbon nanotubes
3. Characterization of the Individual Core/ Shell Silicon Nanowires
4. Light polarized resonant Raman spectra from individual carbon nanotubes