Spectroscopic investigations of arrays containing vertically and horizontally aligned silicon nanowires

Research output: Contribution to journalArticle

Abstract

The properties of nanowire arrays have been investigated mainly in comparison with isolated nanowires or thin films, owing to the difficulty in controlling the nanowire alignment. In this study, we report on arrays containing vertically or horizontally aligned silicon nanowires, whose alignment and structure were determined using x-ray diffraction and scanning electron microscopy. The Raman spectra of the nanowire arrays differ from those of isolated nanowires because of distinct heat dissipation rates of the absorbed energy from the laser, in agreement with recent theoretical calculations. The tailored alignment of the nanowires on solid substrates up to 1 inch of diameter also enabled the observation of resonance modes associated with light trapped into the nanowires. This was proven by comparing the light absorbed and scattered by the arrays, and may be exploited to enhance light harvesting in tandem solar cells. Significantly, the control of the assembly of nanowire arrays may have a direct impact on bottom-up technologies of high anisotropy nanomaterials.

Details

Authors
  • Diogo Volpati
  • Niklas Mårtensson
  • Nicklas Anttu
  • Per Viklund
  • Christian Sundvall
  • Ingvar Åberg
  • Joakim Bäckström
  • Håkan Olin
  • Mikael T. Björk
  • Jaime Castillo-Leon
External organisations
  • Mid Sweden University
  • Sol Voltaics AB
Research areas and keywords

Keywords

  • Anisotropy, Leaky-resonance modes, Nanostructured film, Nanowire array, Raman scattering, Silicon nanowires, Vertical self-Assembly
Original languageEnglish
Article number125021
JournalMaterials Research Express
Volume3
Issue number12
Publication statusPublished - 2016 Dec 1
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes