Optical phonon modes in ordered core-shell CdSe/CdS nanorod arrays

Andrea Giugni*, Gobind Das, Alessandro Alabastri, Remo Proietti Zaccaria, Marco Zanella, Isabella Franchini, Enzo Di Fabrizio, Roman Krahne

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

We investigate the optical phonons in "dot-in-a-rod" core-shell CdSe/CdS nanorods at wavelengths resonant with the optical transitions either in the core or in the shell. At a wavelength above the CdS band gap, only CdS phonon modes were detected. In contrast, at excitation in resonance with the core transitions, we observed phonon modes of both the CdSe core and the CdS shell. In laterally ordered nanorod assemblies, the CdS longitudinal-optical phonon mode manifested a low-energy shoulder that could be related to higher-order longitudinal-optical phonon modes. Furthermore, we report on surface-optical modes that originate from the tracklike superstructure of the nanorod assemblies.

Original languageEnglish (US)
Article number115413
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number11
DOIs
StatePublished - Mar 12 2012
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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