Raman scattering by coupled plasmon-LO phonons in InN nanocolumns

Lazic, Snezana and Gallardo Velasco, Eva María and Calleja Pardo, José Manuel and Agulló-Rueda, Fernando and Grandal Quintana, Javier and Sánchez García, Miguel Angel and Calleja Pardo, Enrique (2008). Raman scattering by coupled plasmon-LO phonons in InN nanocolumns. "Physica Status Solidi C", v. 5 (n. 6); pp. 1562-1564. ISSN 0370-1972. https://doi.org/10.1002/pssc.200778488.

Description

Title: Raman scattering by coupled plasmon-LO phonons in InN nanocolumns
Author/s:
  • Lazic, Snezana
  • Gallardo Velasco, Eva María
  • Calleja Pardo, José Manuel
  • Agulló-Rueda, Fernando
  • Grandal Quintana, Javier
  • Sánchez García, Miguel Angel
  • Calleja Pardo, Enrique
Item Type: Article
Título de Revista/Publicación: Physica Status Solidi C
Date: May 2008
ISSN: 0370-1972
Volume: 5
Subjects:
Freetext Keywords: Raman measurements, phonon, electron density
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Ingeniería Electrónica
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Raman measurements on high quality, relaxed InN nanocolumns grown on Si(001) and Si(111) substrates by plasma-assisted molecular beam epitaxy are reported. A coupled LO phonon-plasmon mode around 430 cm-1, together with the uncoupled LO phonon appears in the nanocolumnar samples. The coupled mode is attributed to spontaneous accumulation of electrons at the lateral surfaces of the nanocolumns, while the uncoupled phonon originates from their inner part. Infrared reflectance measurements confirm the presence of electrons in the nanocolumns. The electron density in the accumulation layer depends on the growth temperature and is sensitive to exposure of HCl. Our results indicate that accumulation of intrinsic electrons occurs not only at the polar surfaces of InN layers, but also on non-polar lateral surfaces of InN nanocolumns. Its origin is attributed to an In-rich surface reconstruction of the nanocolumns sidewalls.

More information

Item ID: 2619
DC Identifier: http://oa.upm.es/2619/
OAI Identifier: oai:oa.upm.es:2619
DOI: 10.1002/pssc.200778488
Official URL: http://www3.interscience.wiley.com/journal/119139597/issue
Deposited by: Memoria Investigacion
Deposited on: 15 Apr 2010 09:33
Last Modified: 20 Apr 2016 12:15
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