Title: Size-Dependent Optical Properties of Zinc Blende Cadmium Telluride Quantum Dots
Authors: Kamal, John Sundar ×
Omari, Abdoulghafar
Van Hoecke, Karen
Zhao, Qiang
Vantomme, André
Vanhaecke, Frank
Capek, Richard Karel
Hens, Zeger #
Issue Date: Mar-2012
Publisher: American Chemical Society
Series Title: Journal of Physical Chemistry C vol:116 issue:8 pages:5049-5054
Abstract: We analyze the optical properties of CdTe quantum dots, including the sizing curve, the absorption coefficient, and the oscillator strength of the band gap transition, by combining absorption spectroscopy, elemental analysis, and electron microscopy imaging. At short wavelengths, the absorption coefficient spectrum is still affected by quantum confinement, yet a largely constant value, close to that of bulk CdTe, is found at around 410 nm. At shorter wavelengths, remaining quantum confinement effects on the CdTe E-1 transition are present even for the largest quantum dots studied (11 nm). For the band gap transition, we find an integrated absorption coefficient mu(gap) that scales almost proportionally to the inverse of the quantum dot volume. Especially for the smaller diameters, deviations up to a factor of 3 are found as compared to widely used literature values. The corresponding oscillator strength f(gap) is almost size-independent in the diameter range 3-7 nm. The correspondence between radiative lifetimes predicted based on f(gap) and literature values is discussed.
ISSN: 1932-7447
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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