Size Dependence of the Spontaneous Emission Rate and Absorption Cross Section of CdSe and CdTe Quantum Dots

In this paper, the size dependence of the band gap, of the spontaneous emission rate, and of the absorption cross section of quantum dots is systematically investigated over a wide size range, using colloidal CdSe and CdTe QDs as model systems

Celso de Mello Donegá; Rolf Koole

2009

Scholarcy highlights

  • In this paper, the size dependence of the band gap, of the spontaneous emission rate, and of the absorption cross section of quantum dots is systematically investigated over a wide size range, using colloidal CdSe and CdTe QDs as model systems
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  • The size dependence of the band gap, of the spontaneous emission rate, and of the absorption cross section of quantum dots is systematically investigated over a wide size range, using colloidal CdSe and CdTe QDs as model systems
  • The size dependence of the band gap is well-described by theoretical models, and is dominated by the quantum confinement contribution
  • The results highlight the importance of the balance between quantum confinement and coulomb interaction contributions to the size dependence of the exciton properties in QDs and offer an explanation to the long-standing discrepancies observed between the empirical size-dependent trends and the theoretical predictions
  • Details concerning the preparation of larger CdTe QDs, derivation of the relation between absorption and spontaneous emission rates, examples of multigaussian fits to absorption spectra, and figures showing the frequency dependence of μSS* and the size dependence of σSS* are provided
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