Surface phonons modes: a tool to determine the quantum dot morphology

We report here theoretical and experimental studies on the spatial confinement of phonons in ternary CdSxSe1-x nanocrystals embedded in a glass matrix formed by the composites SiO2-Na2CO3-B2O3-Al2O3 doped with CdO, S and Se. We determined the morphologic characteristics of the nanocrystals by analyz...

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Bibliographic Details
Published inBrazilian journal of physics Vol. 36; no. 3b; pp. 832 - 835
Main Authors Alcalde, Augusto M., Ribeiro, Alessandra A., Dantas, Noélio O., Mendes Jr, Djalma R., Marques, Gilmar E., Trallero-Giner, Carlos
Format Journal Article
LanguageEnglish
Published Sociedade Brasileira de Física 01.09.2006
Subjects
PHYSICS, MULTIDISCIPLINARY
Quantum dots
Raman scattering
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Summary:We report here theoretical and experimental studies on the spatial confinement of phonons in ternary CdSxSe1-x nanocrystals embedded in a glass matrix formed by the composites SiO2-Na2CO3-B2O3-Al2O3 doped with CdO, S and Se. We determined the morphologic characteristics of the nanocrystals by analyzing the dependence of surface phonon modes on the geometrical parameters. The calculated frequencies are compared with values from Raman spectra of CdSxSe1-x nanocrystals grown under different thermal treatments. A good correlation between experimental and calculated CdS-like and CdSe-like surface optical modes is observed. Raman selection rules and their connection with the nature of the surface optical phonons is discussed.
ISSN:0103-9733
1678-4448
DOI:10.1590/S0103-97332006000600009