Advanced search
1 file | 1.58 MB

Size-dependent optical properties of zinc blende cadmium telluride quantum dots

(2012) JOURNAL OF PHYSICAL CHEMISTRY C. 116(8). p.5049-5054
Author
Organization
Project
Center for nano- and biophotonics (NB-Photonics)
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.
Keywords
HETEROSTRUCTURES, CONFINEMENT, CDS NANOCRYSTALS, CDTE NANOCRYSTALS, ABSORPTION CROSS-SECTION, SEMICONDUCTOR NANOCRYSTALS, EXTINCTION COEFFICIENT, SURFACE STOICHIOMETRY, EXCITON, COLLOIDAL NANOCRYSTALS

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 1.58 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Kamal, John Sundar, Abdoulghafar Omari, Karen Van Hoecke, Qiang Zhao, André Vantomme, Frank Vanhaecke, Richard Karel Capek, and Zeger Hens. 2012. “Size-dependent Optical Properties of Zinc Blende Cadmium Telluride Quantum Dots.” Journal of Physical Chemistry C 116 (8): 5049–5054.
APA
Kamal, J. S., Omari, A., Van Hoecke, K., Zhao, Q., Vantomme, A., Vanhaecke, F., Capek, R. K., et al. (2012). Size-dependent optical properties of zinc blende cadmium telluride quantum dots. JOURNAL OF PHYSICAL CHEMISTRY C, 116(8), 5049–5054.
Vancouver
1.
Kamal JS, Omari A, Van Hoecke K, Zhao Q, Vantomme A, Vanhaecke F, et al. Size-dependent optical properties of zinc blende cadmium telluride quantum dots. JOURNAL OF PHYSICAL CHEMISTRY C. 2012;116(8):5049–54.
MLA
Kamal, John Sundar, Abdoulghafar Omari, Karen Van Hoecke, et al. “Size-dependent Optical Properties of Zinc Blende Cadmium Telluride Quantum Dots.” JOURNAL OF PHYSICAL CHEMISTRY C 116.8 (2012): 5049–5054. Print.
@article{3005593,
  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.},
  author       = {Kamal, John Sundar and Omari, Abdoulghafar and Van Hoecke, Karen and Zhao, Qiang and Vantomme, Andr{\'e} and Vanhaecke, Frank and Capek, Richard Karel and Hens, Zeger},
  issn         = {1932-7447},
  journal      = {JOURNAL OF PHYSICAL CHEMISTRY C},
  keyword      = {HETEROSTRUCTURES,CONFINEMENT,CDS NANOCRYSTALS,CDTE NANOCRYSTALS,ABSORPTION CROSS-SECTION,SEMICONDUCTOR NANOCRYSTALS,EXTINCTION COEFFICIENT,SURFACE STOICHIOMETRY,EXCITON,COLLOIDAL NANOCRYSTALS},
  language     = {eng},
  number       = {8},
  pages        = {5049--5054},
  title        = {Size-dependent optical properties of zinc blende cadmium telluride quantum dots},
  url          = {http://dx.doi.org/10.1021/jp212281m},
  volume       = {116},
  year         = {2012},
}

Altmetric
View in Altmetric
Web of Science
Times cited: