Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Study of the temperature distribution in Si nanowires under microscopic laser beam excitation
Year:2012
Research Areas
  • Physics chemical and mathematical,
  • Electronic technology and of the communications
Information
Abstract
The use of laser beams as excitation sources for the characterization of semiconductor nanowires (NWs) is largely extended. Raman spectroscopy and photoluminescence (PL) are currently applied to the study of NWs. However, NWs are systems with poor thermal conductivity and poor heat dissipation, which result in unintentional heating under the excitation with a focused laser beam with microscopic size, as those usually used in microRaman and microPL experiments. On the other hand, the NWs have subwavelength diameter, which changes the optical absorption with respect to the absorption in bulk materials. Furthermore, the NW diameter is smaller than the laser beam spot, which means that the optical power absorbed by the NW depends on its position inside the laser beam spot. A detailed analysis of the interaction between a microscopic focused laser beam and semiconductor NWs is necessary for the understanding of the experiments involving laser beam excitation of NWs. We present in this work a numerical analysis of the thermal transport in Si NWs, where the heat source is the laser energy locally absorbed by the NW. This analysis takes account of the optical absorption, the thermal conductivity, the dimensions, diameter and length of the NWs, and the immersion medium. Both free standing and heat-sunk NWs are considered. Also, the temperature distribution in ensembles of NWs is discussed. This analysis intends to constitute a tool for the understanding of the thermal phenomena induced by laser beams in semiconductor NWs.
International
Si
JCR
Si
Title
Applied Physics a-Materials Science & Processing
ISBN
0947-8396
Impact factor JCR
1,63
Impact info
Volume
online
DOI 10.1007/s00339-012-7509-y
Journal number
12/2013/29
From page
1
To page
10
Month
DICIEMBRE
Ranking
Participants
  • Autor: J. Anaya (U Valladolid.)
  • Autor: A. Torres (U. Valladolid)
  • Autor: A. Martín-Martín (U. Valladolid)
  • Autor: J. Souto (U. Valladolid)
  • Autor: J. Jiménez (U. Valladolid)
  • Autor: Andres Rodriguez Dominguez (UPM)
  • Autor: Tomas Rodriguez Rodriguez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Grupo de Conectividad
  • Departamento: Tecnología Electrónica
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)