Type

Journal Article

Authors

Tania Perova
Alan Moore
Yury Rakovich
John Francis Donegan

Subjects

Physics

Topics
electronic electrical engineering zns core shell raman spectra raman scattering quantum dots physics spectra raman spectroscopy

Effect of ZnS Shell Thickness on the Phonon Spectra in CdSe Quantum Dots (2003)

Abstract The evolution of the optical phonon spectra of colloidal core/shell CdSe/ZnS quantum dots with an increase of the shell thickness from 0.5 to 3.4 monolayers has been studied by resonant Raman spectroscopy. The results obtained suggest that the ZnS shell changes its structure from amorphous to partly crystalline as the thickness increases. Simultaneously, an increase in Raman scattering by surface ~core/shell interface! phonons and the redshift of the corresponding phonon band have been observed and assigned to variations in the shell structure. The disorder present in the shell provides a major contribution to the line shape of the Raman spectra at higher ZnS coverage. A method to control the quality of quantum dots based on Raman spectroscopy is proposed.
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Full list of authors on original publication

Tania Perova, Alan Moore, Yury Rakovich, John Francis Donegan

Experts in our system

1
Tania Perova
Trinity College Dublin
Total Publications: 86
 
2
John Francis Donegan
Trinity College Dublin
Total Publications: 152