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Resonant photoluminescence and excitation spectroscopy of CdSe/ZnSe and CdTe/ZnTe self-assembled quantum dots

Published online by Cambridge University Press:  11 February 2011

S. Mackowski
Affiliation:
Department of Physics, University of Cincinnati, OH 45221–0011, United States
H. Rho
Affiliation:
Department of Physics, University of Cincinnati, OH 45221–0011, United States
H. E. Jackson
Affiliation:
Department of Physics, University of Cincinnati, OH 45221–0011, United States
L. M. Smith
Affiliation:
Department of Physics, University of Cincinnati, OH 45221–0011, United States
J. Wrobel
Affiliation:
Institute of Physics, Polish Academy of Science, Warsaw, Poland.
K. Fronc
Affiliation:
Institute of Physics, Polish Academy of Science, Warsaw, Poland.
J. Kossut
Affiliation:
Institute of Physics, Polish Academy of Science, Warsaw, Poland.
G. Karczewski
Affiliation:
Institute of Physics, Polish Academy of Science, Warsaw, Poland.
M. Dobrowolska
Affiliation:
Department of Physics, University of Notre Dame, United States
J. Furdyna
Affiliation:
Department of Physics, University of Notre Dame, United States
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Abstract

We show that two major carrier excitation mechanisms are present in II-VI self-assembled quantum dots. The first one is related to direct excited state – ground state transition. It manifests itself by the presence of sharp and intense lines in the excitation spectrum measured from single quantum dots. Apart from these lines, we also observe up to four much broader excitation lines. The energy spacing between these lines indicates that they are associated with absorption related to longitudinal optical phonons. By analyzing resonantly excited photoluminescence spectra, we are able to separate the contributions from these two mechanisms. In the case of CdTe dots, the excited state – ground state relaxation is important for all dots in ensemble, while phonon-assisted processes are dominant for the dots with smaller lateral size.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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References

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