Confined optical vibrations in CdTe quantum dots and clusters

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • A. G. Rolo
  • M. I. Vasilevskiy
  • N. P. Gaponik
  • A. L. Rogach
  • M. J M Gomes

Detail(s)

Original languageEnglish
Pages (from-to)433-437
Journal / PublicationPhysica Status Solidi (B) Basic Research
Volume229
Issue number1
Publication statusPublished - 2002
Externally publishedYes

Abstract

Absorption of far-infrared (FIR) radiation and Raman scattering in CdTe nano-crystals (spherical quantum dots (QDs) of several nanometers in size) and Cd54Te32(SCH2CH2OH)32 8- clusters prepared by colloidal synthesis were studied. Raman spectra of both QDs and clusters are dominated by a peak situated slightly below the bulk CdTe LO phonon frequency. Experimental FIR transmittance spectra of films containing CdTe clusters show a broad band between the bulk TO and LO phonon frequencies, while there is only a single dip at the Fröhlich frequency observed for larger QDs. These observations are in agreement with the results of our numerical lattice dynamics calculations and previously published theoretical results based on a continuous model. It is suggested that the lattice dynamics of very small clusters is similar to that of large crystallites in the sense that there still exists the dispersion of optical vibration frequencies within the LO-TO band of bulk material.

Citation Format(s)

Confined optical vibrations in CdTe quantum dots and clusters. / Rolo, A. G.; Vasilevskiy, M. I.; Gaponik, N. P. et al.
In: Physica Status Solidi (B) Basic Research, Vol. 229, No. 1, 2002, p. 433-437.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review