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CdZnSe/Zn(Be)Se Quantum Dot Structures: Size, Chemical Composition and Phonons

Published online by Cambridge University Press:  01 February 2011

Y. Gu,
Igor L. Kuskovsky,
J. Fung,
R. Robinson,
I. P. Herman,
G. F. Neumark,
X. Zhou,
S. P. Guo and
M. C. Tamargo
Y. Gu
Affiliation:
Department of Applied Physics & Applied Mathematics, Columbia University, New York, NY 10027
Igor L. Kuskovsky
Affiliation:
Department of Applied Physics & Applied Mathematics, Columbia University, New York, NY 10027
J. Fung
Affiliation:
Department of Applied Physics & Applied Mathematics, Columbia University, New York, NY 10027
R. Robinson
Affiliation:
Department of Applied Physics & Applied Mathematics, Columbia University, New York, NY 10027
I. P. Herman
Affiliation:
Department of Applied Physics & Applied Mathematics, Columbia University, New York, NY 10027
G. F. Neumark
Affiliation:
Department of Applied Physics & Applied Mathematics, Columbia University, New York, NY 10027
X. Zhou
Affiliation:
Department of Chemistry, City College of CUNY, New York, NY 10031
S. P. Guo
Affiliation:
Department of Chemistry, City College of CUNY, New York, NY 10031
M. C. Tamargo
Affiliation:
Department of Chemistry, City College of CUNY, New York, NY 10031
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Abstract

The size and chemical composition of optically active CdZnSe/ZnSe and CdZnSe/Zn0.97Be0.03Se quantum dots (QDs) are determined using photoluminescence, photoluminescence excitation and polarized Raman scattering spectroscopies. We show that the addition of Be into the barrier enhances the Cd composition and the quantum size effect of optically active QDs. Additionally, surface phonons from QDs are observed in CdZnSe/ZnBeSe nanostructures.

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References

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