Raman analysis of silicon and germanium nanowires - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2014

Raman analysis of silicon and germanium nanowires

Résumé

Silicon and germanium nanowires are synthesized by the VLS (Vapor Liquid Solid) growth process in a LPCVD reactor (Low Pressure Chemical Vapor Deposition), using gold catalysts and silane (SiH4) and germane (GeH4) respectively as gas precursors. The gold catalyst droplets can be formed by either by dewetting of gold continuous layers or deposition of a colloidal solution on the substrate. The second solution was used in the present work to get a control on the nanowire diameter during growth, which is not possible when starting with a continuous gold layer. These nanowires are characterized by Raman spectroscopy to study their structure and electronic properties. In fact, the Raman spectrum is sensitive to many factors that can cause its modification (effect of inhomogeneous distribution of the diameters, inhomogeneous heating effect and laser-induced phonon confinement effect). These effects can lead to the shifting and broadening of Raman spectra compared to a Si or Ge monocrystalline reference. On the Raman spectra from our individual nanowires, we observe in the case of tapered nanowires, oscillations on the phonon line intensities which we attribute to resonances related the local nanowire diameter. Such effects have been predicted from theoretical simulations. [1] 1. Cao, L., B. Nabet, and J.E. Spanier, Enhanced Raman scattering from individual semiconductor nanocones and nanowires. Physical review letters, 2006. 96(15): p. 157402.
Fichier non déposé

Dates et versions

hal-01152385 , version 1 (16-05-2015)

Identifiants

  • HAL Id : hal-01152385 , version 1

Citer

Israel M., Alain Moréac, Rogel R., Jean-Pierre Landesman, Laurent Pichon. Raman analysis of silicon and germanium nanowires. EMRS Spring Meeting 2014, May 2014, Lille, France. ⟨hal-01152385⟩
144 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More